WO2006080504A1

WO2006080504A1 - Upsetting method and upsetting device

Info

Publication number: WO2006080504A1
Application number: PCT/JP2006/301474
Authority: WO
Inventors: Atsushi Otaki
Original assignee: Showa Denko K.K.
Priority date: 2005-01-31
Filing date: 2006-01-30
Publication date: 2006-08-03
Also published as: KR20070099004A; EP1844876A4; EP1844876A1

Abstract

A upsetting method and an upsetting device capable of efficiently increasing the diameter of a bar-like material at at least two positions. In the method, a plurality of guides (31) and (32) having insertion holes (34) are prepared, and the bar-like material (1) fixed to a fixed die (20) is inserted into the insertion holes (34) of the plurality of guides (31) and (32) in order and held therein. Next, while the material (1) is axially pressed by a punch (50R), the plurality of guides (31) and (32) are integrally moved in a direction opposite to the moving direction of the punch (50R) in a mutually fitted state to increase the diameter of the first exposed part (4) of the material (1) exposed between the first guide (31) disposed on the forefront among the plurality of guides (31) and (32) and the fixed die (20). After the first guide (31) is moved, the second guide (32) disposed on the rear side of the first guide (31) among the plurality of guides (31) and (32) is moved in the direction opposite to the moving direction of the punch (50R) to increase the diameter of the second exposed part of the material (1) exposed between the both guides (31) and (32).

Description

Specification

Upsetting method and upsetting apparatus

Technical field

[0001] The present invention relates to an upsetting method and an upsetting apparatus for expanding the diameter of two or more portions of a rod-shaped material.

Background art

[0002] In general, the upsetting process is to increase the diameter of a predetermined portion of the material by pressing the rod-shaped material in the axial direction. In this upsetting process, if the material buckles during processing, the resulting product (upset processed product) will have a defective shape (such as creases and fogging) and the value of the product will be impaired. In order to prevent buckling from occurring, the following upsetting is conventionally known.

That is, the material is fixed to the fixed die, and the material is passed through a through hole provided in the guide to hold the material in a buckling-prevented state. Next, while pressing the material in the axial direction with a punch, the exposed portion of the material exposed between the front end of the guide and the fixed die is enlarged by moving the guide in the direction opposite to the moving direction of the punch. (For example, Patent Literature 1 1-2).

Patent Document 1: JP-A-48-62646

Patent Document 2: Japanese Patent Laid-Open No. 9-253782

Disclosure of the invention

Problems to be solved by the invention

[0004] Thus, when expanding the diameter of two locations of the material by the conventional upsetting method, the material is first expanded at one location, then the material is inverted, and then the remaining locations are expanded. Although it may be possible to reduce the diameter, this method requires the work of reversing the material, and there is a problem that the number of steps required for processing increases.

[0005] The present invention has been made in view of the above-described technical background, and an object of the present invention is to an upsetting method capable of efficiently expanding the diameter of at least two portions of a rod-shaped material, and the method of covering the same. It is to provide an upsetting apparatus that can be suitably used. Means for solving the problem

[0006] The present invention provides the following means.

[0007] [1] A plurality of guides having through-holes penetrating in the axial direction for inserting and holding a rod-shaped material in a buckling-preventing state are prepared,

The material fixed to the fixed die is sequentially inserted and held in the through holes of the plurality of guides, and then the plurality of guides are punched integrally in a state of mutual contact while pressing the material in the axial direction with a punch. The diameter of the first exposed portion of the material exposed between the first guide disposed on the foremost side of the plurality of guides and the fixed die is increased by moving in a direction opposite to the moving direction of

After the movement of the first guide, the second guide arranged behind the first guide in the plurality of guides is moved relative to the first guide in the direction opposite to the movement direction of the punch. The upsetting method is characterized in that the diameter of the second exposed portion of the material exposed between the second guide and the first guide is increased.

[0008] [2] In the case of expanding the diameter of the first exposed portion of the material in an unconstrained state,

The average movement speed from the start of punch movement is P,

The average movement speed from the start of movement of the first guide is G,

The buckling limit length in the cross-sectional area of the material before upsetting is X,

0

The buckling limit length in the cross-sectional area of the enlarged diameter part formed by the enlarged diameter of the first exposed part is X,

1 The initial clearance between the first guide and the fixed die is x (where o≤x≤x),

0

The time lag from the start of punch movement to the start of movement of the first guide is t

),

The length of the material before the upsetting process required for the expanded diameter portion is 1,

0

The upsetting time from the start of punch movement is τ,

And then,

In the case of t and T, G is

0

0≤G≤P (X -X) / (l -X -Pt)

1 0 1 0

The upsetting method described in 1 above, which satisfies the relational expression (1).

[0009] [3] When the diameter of the first exposed portion of the material is expanded in the molding recess provided in the fixed die. And

The average movement speed from the start of punch movement is P,

The average movement speed from the start of movement of the first guide is G,

0

X (where o≤x≤ x 0), the initial clearance between the front end of the first guide and the bottom of the molding recess

The length of the material before upsetting required for the enlarged diameter part formed by expanding the first exposed part is L,

0

The stop position of the tip of the punch obtained from the design volume of the enlarged diameter portion with respect to the bottom of the molding recess is X,

P

X is the stop position of the front end of the first guide determined by the design relative to the bottom of the molding recess, and g is the time lag from the start of the punch movement to the start of the first guide t (where 0≤t

0 0

),

And G is

G = P (X -X) / (L -X -Pt)

g 0 P 0

The upsetting method described in the preceding paragraph 1, satisfying the formula:

[0010] [4] At least the first guide among the plurality of guides can be divided into a plurality of parts by a dividing surface that vertically cuts the insertion hole. Processing method.

[0011] [5] The upsetting method according to any one of items 1 to 4, wherein the material is a round bar-shaped rolled material.

[0012] [6] The upsetting method as recited in the aforementioned Item 5, wherein the rolled material is a forged rolled material.

[7] The upsetting method according to item 5, wherein the rolled material is a continuous forged rolled material.

[8] [8] The first exposed portion and the second exposed portion of the material are enlarged in diameter in a state where the lubricant is attached to the peripheral surface of each through hole of the plurality of guides and / or the surface of the material. The upsetting method according to any one of items 5 to 7 above.

[0015] [9] With the part corresponding to the front end of the first guide in the material heated locally

The upsetting method according to any one of items 1 to 8, wherein the first exposed portion of the material is expanded in diameter. [0016] [10] The upsetting method as recited in the aforementioned Item 9, wherein a portion of the material corresponding to the front end portion of the first guide is locally induction heated by induction heating means.

[11] The front section of the first guide is locally induction-heated by induction heating means to locally heat a portion corresponding to the front end of the first guide in the material according to the preceding item 9. Upsetting method.

[12] The upsetting method according to any one of [9] to [11], wherein a portion of the material corresponding to the front end portion of the first guide is locally heated to a semi-molten state.

[13] [13] Before expanding the diameter of the first exposed portion of the material in a state where the portion corresponding to the portion behind the front end portion of the first guide in the material is locally cooled by the cooling means 9-9 : Any of 12 Upsetting methods described in 1 above.

[14] [14] The force described in any one of the preceding paragraphs 1 to 13 in which the second exposed portion of the material is expanded in a state where the portion of the material corresponding to the front end portion of the second guide is locally heated. Machining method.

[15] The upsetting method as recited in the aforementioned Item 14, wherein a portion of the material corresponding to the front end portion of the second guide is locally induction heated by induction heating means.

[16] The item described in the preceding paragraph 14, wherein the portion corresponding to the front end portion of the second guide in the material is locally heated by induction heating the front end portion of the second guide by induction heating means. Upsetting method.

[0023] [17] The upsetting method according to any one of items 14 to 16 above, wherein a portion of the material corresponding to the front end portion of the second guide is locally heated to a semi-molten state.

[0024] [18] Before expanding the second exposed portion of the material in a state in which the portion corresponding to the portion behind the front end portion of the second guide in the material is locally cooled by the cooling means 14- : Either 17 Upsetting method described in item 1.

[0025] [19] The above-mentioned items 1 to 18: Any one of the forces 18 Upsetting products obtained by the upsetting method described in item 4 above.

[0026] [20] One of the axial side portions of the rod-shaped material is inserted and held in an axial direction so as to pass through and hold one side portion in a buckling-prevented state, and arranged side by side in the axial direction. Multiple One side guide,

At least one other side guide having an axially penetrating hole for passing and holding the other side of the material in a buckling-prevented state;

A punch for one side that presses one side of the material in the axial direction;

A punch for the other side that presses the other side of the material in the axial direction;

Prepare

One side portion of the material fixed to the fixed die at the intermediate portion in the axial direction of the material is sequentially inserted and held in each through hole of the plurality of one-side guides, and the other side portion of the material is used for the other side portion. Hold the guide through the insertion hole,

Next, while pressing one side of the material in the axial direction with the punch for one side, the plurality of guides for one side are integrally adhered in a direction opposite to the moving direction of the punch for one side. By moving, the diameter of the first exposed portion of the material exposed between the first guide disposed on the foremost side in the plurality of one-side guides and the fixed die is increased, and the first guide is moved. After the completion, the second guide disposed behind the first guide in the plurality of one-side guides is moved relative to the first guide in a direction opposite to the moving direction of the one-side punch. By moving, the diameter of the second exposed part of the material exposed between the second guide and the first guide is expanded,

Furthermore, simultaneously with the pressing of one side of the material by the punch for one side, the other side guide is moved in the axial direction by the punch for the other side while the other side guide is moved. An upsetting method characterized in that the diameter of the third exposed portion of the material exposed between the other side guide and the fixed die is increased by moving in a direction opposite to the direction.

[21] When expanding the diameter of the first exposed part of the material in an unconstrained state,

The average moving speed from the start of the movement of the punch for one side is P,

The average movement speed from the start of movement of the first guide is G,

0

The time lag from the start of the movement of the one side punch to the start of the movement of the first guide is t (however, 0≤t),

0

The upsetting time from the start of one side punch movement is τ,

And then,

For t <G, G is

0

0≤G≤P (X -X) / (l -X -Pt)

1 0 1 0

21. The upsetting method as described in 20 above, wherein the relational expression is satisfied.

[22] [22] In the case of expanding the diameter of the first exposed portion of the material in the molding recess provided in the fixed die,

The average movement speed from the start of movement of the first guide is G,

0

The initial clearance between the front end of the first guide and the bottom of the molding recess is x (where o≤x≤χ),

0

The stop position of the tip of the one side punch obtained from the design volume of the enlarged diameter portion with respect to the bottom of the molding recess is X,

P

The stop position of the front end of the first guide determined by design relative to the bottom of the molding recess is X,

g The time lag from the start of movement of the one-side punch to the start of movement of the first guide is t (伹

0 and o≤t),

0

And G is

G = P (X -X) / (L -X -Pt)

g 0 P 0

21. The upsetting method according to the above 20, satisfying the formula:

[0029] [23]

23. The upsetting according to any one of the items 20 to 22, wherein at least the first guide among the plurality of one-side guides can be divided into a plurality of parts by a dividing surface that vertically cuts the through hole. Processing method. [0030] [24] The upsetting method according to any one of items 20 to 23, wherein the material is a round bar-shaped rolled material.

[0031] [25] The upsetting method according to item 24, wherein the rolled material is a forged rolled material,

[26] The upsetting method as described in 24 above, wherein the rolled material is a continuous forged rolled material.

[27] Lubricant adheres to at least one of the peripheral surface of each through hole of the plurality of one side guides, the peripheral surface of the through hole of the other side guide, and the surface of the material. 27. The upsetting method according to any one of items 24 to 26, wherein the first exposed portion, the second exposed portion, and the third exposed portion of the material are expanded in a state where the first exposed portion is expanded.

[0033] [28] The upsetting according to any one of items 20 to 27, wherein the first exposed portion of the material is expanded in a state where the portion of the material corresponding to the front end portion of the first guide is locally heated. Processing method.

[0034] [29] The upsetting method as recited in the aforementioned Item 28, wherein a portion of the material corresponding to the front end portion of the first guide is locally induction heated by induction heating means.

[0035] [30] The description of the preceding item 28, wherein the front end portion of the first guide is locally induction-heated by induction heating means to locally heat the portion of the material corresponding to the front end portion of the first guide. Upsetting method.

[31] The upsetting method according to any one of items 28 to 30, wherein a portion of the material corresponding to the front end portion of the first guide is locally heated to a semi-molten state.

[0037] [32] In the state where the first exposed portion of the material is expanded in diameter in a state where the portion corresponding to the rear portion of the first guide in the material is locally cooled by the cooling means 28- 31 Any of the upsetting methods described in item 1.

[0038] [33] Upsetting according to any one of items 20 to 32, wherein the second exposed portion of the material is expanded in a state where a portion of the material corresponding to the front end portion of the second guide is locally heated. Processing method.

[0039] [34] The upsetting method as recited in the aforementioned Item 33, wherein a portion of the material corresponding to the front end portion of the second guide is locally induction heated by induction heating means.

[0040] [35] The preceding paragraph 33, in which the portion corresponding to the front end of the second guide in the material is locally heated by induction heating of the front end of the second guide by induction heating means. The upsetting method of loading.

[0041] [36] The upsetting method according to any one of items 33 to 35, wherein a portion of the material corresponding to the front end portion of the second guide is locally heated to a semi-molten state.

[0042] [37] In the state in which the diameter of the second exposed portion of the material is expanded in a state where the portion corresponding to the portion behind the front end portion of the second guide in the material is locally cooled by the cooling means 33- One of 36. The upsetting method described in item 1.

[0043] [38] Upsetting according to any one of items 20 to 37, wherein the third exposed portion of the material is expanded in a state where the portion of the material corresponding to the front end portion of the third guide is locally heated. Processing method.

[0044] [39] The upsetting method as recited in the aforementioned Item 38, wherein a part of the material corresponding to the front end portion of the third guide is locally induction heated by induction heating means.

[0045] [40] The preceding paragraph 38, wherein the portion corresponding to the front end of the third guide in the material is locally heated by induction heating the front end of the third guide by induction heating means. Upsetting method.

[0046] [41] The upsetting method according to any one of [38] to [40], wherein a portion of the material corresponding to the front end portion of the third guide is locally heated to a semi-molten state.

[0047] [42] Before expanding the third exposed portion of the material in a state where the portion of the material corresponding to the region behind the front end of the third guide is locally cooled by the cooling means 38- One of 41. Upsetting method according to item 1.

[0048] [43] An upsetting product obtained by the upsetting method according to any one of 20 to 42 above.

[0049] [44] A plurality of guides having axially penetrating through holes that pass through and hold the rod-shaped material in a buckling-prevented state and are arranged side by side in the axial direction;

A punch that presses the material in the axial direction;

A plurality of guide driving devices for moving the guides in the plurality of guides in directions opposite to the movement direction of the punch, respectively;

An upsetting apparatus characterized by comprising:

[45] [45] At least the frontmost guide of the plurality of guides is inserted. 45. The upsetting apparatus according to the above item 44, wherein the through-hole can be divided into a plurality of division surfaces.

[0051] [46] The material is a round bar-shaped rolled material,

46. The upsetting apparatus according to the above item 44 or 45, further comprising a lubricant adhering means for adhering a lubricant to a peripheral surface of each through hole of a plurality of guides and / or a surface of a material.

[0052] [47] The upsetting apparatus according to item 46, wherein the rolled material is a forged rolled material.

[0053] [48] The upsetting apparatus according to [46], wherein the rolled material is a continuous forged rolled material.

[0054] [49] The installation according to any one of the above items 44 to 48, further comprising a heating means for locally heating a portion corresponding to a front end portion of at least one guide among the plurality of guides in the material. Machining equipment.

[0055] [50] The heating means is an induction heating means having an induction heating coil,

50. The upsetting apparatus according to item 49, wherein a portion of the material corresponding to the front end portion of the at least one guide is locally induction-heated by an induction heating means.

[0056] [51] The heating means is an induction heating means having an induction heating coil,

49. The previous section configured to locally heat a portion corresponding to the front end portion of the at least one guide in the material by locally induction heating the front end portion of the at least one guide by induction heating means. The upsetting machine described.

[0057] [52] The heating means according to any one of the items 49 to 51, wherein the portion of the material corresponding to the front end portion of the at least one guide can be locally heated to a semi-molten state. Upsetting machine.

[53] The force according to any one of items 49 to 52, further comprising a cooling unit that locally cools a portion of the material corresponding to a portion on the rear side of the front end portion of the at least one guide. Upsetting machine.

[54] One of the two axial side portions of the rod-shaped material is held in a buckling-prevented state, and has a through hole penetrating in the axial direction, and arranged side by side in the axial direction. A plurality of guides for one side,

It has a through hole that penetrates in the axial direction to hold the other side of the material in a buckling-prevented state. At least one guide for the other side,

A plurality of one-side guide driving devices for moving each guide in the plurality of one-side guides in a direction opposite to the moving direction of the one-side punch;

A guide driving device for the other side that moves the guide for the other side in the direction opposite to the moving direction of the punch for the other side,

An upsetting apparatus characterized by comprising:

[0060] [55] The guide according to Item 54, wherein the guide disposed at least on the foremost side among the plurality of one-side guides can be divided into a plurality of parts by a dividing surface that vertically cuts the through hole. Upsetting machine.

[0061] [56] The material is a round bar-shaped rolled material,

Lubricant adhering means for adhering the lubricant to at least one of the peripheral surface of each insertion hole of the plurality of one side guides, the peripheral surface of the through hole of the other side guide, and the surface of the material is provided. 56. The upsetting apparatus according to 54 or 55 above.

[0062] [57] The upsetting apparatus according to 56, wherein the rolled material is a forged rolled material.

[0063] [58] The upsetting apparatus according to 56 above, wherein the rolled material is a continuous forged rolled material.

[0064] [59] Heating means for locally heating a portion corresponding to the front end of at least one of the plurality of one-side guides and the other-side guides in the material is provided. The upsetting apparatus according to claim 1, wherein the deviation or deviation of items 54 to 58 above.

[0065] The heating means is an induction heating means having an induction heating coil,

60. The upsetting apparatus according to item 59, wherein a portion of the material corresponding to the front end portion of the at least one guide is locally induction-heated by an induction heating means.

[0066] [61] The heating means is an induction heating means having an induction heating coil,

59. The previous item configured to locally heat a portion of the material corresponding to the front end portion of the at least one guide by locally induction heating the front end portion of the at least one guide by induction heating means. The upsetting machine described. [0067] [62] The heating means according to any one of items 59 to 61, wherein a portion of the material corresponding to the front end portion of the at least one guide can be locally heated to a semi-molten state. Upsetting machine.

[63] [63] The force according to any one of items 59 to 62, further including a cooling means for locally cooling a portion of the material corresponding to a portion on the rear side of the front end portion of the at least one guide. Upsetting machine.

The invention's effect

[0069] The present invention has the following effects.

[0070] In the invention [1], the diameter of at least two portions (first exposed portion and second exposed portion) of the material can be expanded without necessarily inverting the material. Therefore, when expanding the diameter of two or more parts of the material by upsetting, the diameter can be expanded efficiently.

[0071] In the invention of [2], since the diameter of the exposed portion of the material is expanded in an unconstrained state, the exposed portion can be expanded with a low punch pressing force, that is, a low molding pressure, thereby driving the punch. The required driving force can be reduced. Furthermore, since the exposed portion can be enlarged in diameter without using an expensive forming die having a forming recess, the manufacturing cost, that is, the processing cost can be reduced.

[0072] Furthermore, since the average moving speed G from the start of the movement of the guide satisfies a predetermined relational expression, buckling that may occur during machining can be reliably prevented.

[0073] In the invention [3], the exposed portion of the material can be surely expanded to a designed shape.

[0074] In the invention of [4], the upsetting work product can be taken out from the guide through hole without any trouble after the processing is completed.

[0075] In the invention of [5], since a round bar-shaped material made of a rolled material can be obtained or manufactured at a low cost, the use of this material as an upsetting material can reduce the processing cost.

[0076] Furthermore, this material generally has a lower roundness than a round bar-shaped material made of extruded material. Therefore, if this material is passed through the insertion hole of the guide, the surface of the material and the periphery of the insertion hole A gap is inevitably generated between the surface. Therefore, the contact area between the two is small. Therefore, the frictional resistance when the material slides in the axial direction in the guide through hole is small. The molding pressure can be reduced. For this reason, a small punch driving device for moving the punch can be used, and therefore the installation space for the upsetting device can be saved.

[0077] Further, since the molding pressure can be reduced, the following advantages are obtained. That is, if the molding pressure is high, the end of the material is often crushed in the guide through-hole by the pressing force from the punch. In this case, a part of the material of the material enters the gap between the peripheral surface of the punch and the peripheral surface of the through hole, and as a result, the molding pressure increases and the punch is pressed in the insertion hole. There is a problem that it becomes impossible to move because it cannot move in the direction. Therefore, by reducing the molding pressure, such a problem does not occur, and the diameter of the material can be increased well over a long region.

[0078] In the invention of [6], since a material made of a forged rolled material can be obtained or manufactured at a lower cost, the processing cost can be further reduced by using this material as an upsetting material.

[0079] In the invention of [7], since the raw material made of continuous instantly rolled material can be obtained or manufactured at a lower cost, the processing cost can be further reduced by using this material as an upsetting material. it can.

[0080] The invention of [8] has the following advantages. That is, as described above, since the round bar-shaped material made of rolled material has low roundness, if this material is passed through the guide through hole, the surface of the material and the peripheral surface of the through hole A gap is inevitably generated between them. When the lubricant is adhered to the surface of each through hole of the plurality of guides and / or the surface of the material, the lubricant enters the gap and is temporarily stored. This promotes the spraying of lubricant on the peripheral surface of the through hole and the surface of the material. That is, as the material slides in the axial direction in the through hole during processing, the lubricant in the gap is dispersed on the peripheral surface of the through hole and the surface of the material. Thereby, the frictional resistance between the peripheral surface of the through hole and the surface of the material can be reliably reduced, that is, the molding pressure can be reliably reduced.

[0081] In the invention of [9], since the deformation resistance is locally reduced only at the portion corresponding to the front end portion of the first guide in the material, the molding pressure can be reduced.

[0082] On the other hand, the part corresponding to the rear part of the material from the front end of the first guide Because it is not heated, the deformation resistance does not decrease. Therefore, it is possible to prevent the molding pressure from increasing due to the material bulging in the through hole of the first guide due to the pressing force from the punch.

[0083] According to the invention [10], the part of the material corresponding to the front end portion of the first guide can be reliably and extremely efficiently heated.

[0084] According to the invention of [11], the part of the material corresponding to the front end portion of the first guide can be reliably and efficiently heated.

[0085] In the invention of [12], the molding pressure can be greatly reduced.

[0086] In the invention of [13], it is possible to reliably suppress the heating of the portion corresponding to the rear portion of the material from the front end portion of the first guide. Therefore, it is possible to reliably suppress a decrease in deformation resistance at the corresponding part of the material.

[0087] In the invention [14], since the deformation resistance is locally reduced only at the portion of the material corresponding to the front end portion of the second guide, the molding pressure can be reduced.

[0088] On the other hand, the deformation resistance does not decrease because the material is not heated at the site corresponding to the site behind the front end of the second guide. Therefore, it is possible to prevent an increase in molding pressure caused by the material swelling in the insertion hole of the second guide due to the pressing force from the punch.

[0089] In the invention of [15], the portion of the material corresponding to the front end portion of the second guide can be heated reliably and extremely efficiently.

[0090] In the invention of [16], the part of the material corresponding to the front end portion of the second guide can be reliably and efficiently heated.

[0091] In the invention of [17], the molding pressure can be greatly reduced.

[0092] In the invention of [18], it is possible to reliably suppress heating of a portion of the material corresponding to a portion on the rear side of the front end portion of the second guide. Therefore, it is possible to reliably suppress a decrease in deformation resistance at the corresponding part of the material.

[0093] According to the invention of [19], it is possible to provide a high-quality upsetting product in which two or more enlarged diameter portions are formed.

[0094] In the invention of [20], at least three parts of the material (that is, the first number) are not necessarily reversed. (1 exposed part, 2nd exposed part, and 3rd exposed part) can be expanded. Therefore, when expanding the diameter of three or more parts of the material by upsetting, the force S can be increased efficiently.

[0095] The inventions [21] to [37] have the same effects as the inventions [2] to [: 18], respectively.

[0096] In the invention of [38], since the deformation resistance is locally reduced only at the portion of the material corresponding to the front end portion of the third guide, the molding pressure can be reduced.

[0097] On the other hand, the deformation resistance does not decrease because the material is not heated in the region corresponding to the region behind the front end of the third guide. Therefore, it is possible to prevent an increase in molding pressure caused by the material swelling in the insertion hole of the other side guide by the pressing force of the other side punch force.

[0098] In the invention of [39], the portion of the material corresponding to the front end portion of the third guide can be reliably and extremely efficiently heated.

[0099] According to the invention of [40], the portion of the material corresponding to the front end portion of the third guide can be heated reliably and efficiently.

[0100] In the invention of [41], the molding pressure can be greatly reduced.

[0101] In the invention of [42], it is possible to reliably suppress the heating of the portion corresponding to the rear portion of the material from the front end portion of the third guide. Therefore, it is possible to reliably suppress a decrease in deformation resistance at the corresponding part of the material.

[0102] In the invention of [43], it is possible to provide a high-quality upsetting product in which three or more enlarged diameter portions are formed.

[0103] In the inventions of [44] to [53], an upsetting apparatus that can be suitably used in the upsetting method according to any one of the above-mentioned [1] to [: 18] can be provided.

[0104] The inventions [54] to [63] can provide an upsetting apparatus that can be suitably used in the upsetting method according to any one of the above inventions [20] to [42].

Brief Description of Drawings

FIG. 1 is a longitudinal sectional view of an essential part of the upsetting apparatus before the diameter of a predetermined portion of the material is increased by the upsetting apparatus according to the first embodiment of the present invention. 2] It is a longitudinal sectional view of the main part of the upsetting apparatus in a state in which a predetermined portion of the material is being expanded in diameter by the upsetting apparatus.

3] It is a longitudinal sectional view of the main part of the upsetting apparatus in a state where the predetermined portion of the material is further expanded in diameter by the upsetting apparatus.

4] It is a longitudinal sectional view of a main part of the upsetting apparatus after a predetermined part of the material has been expanded by the upsetting apparatus.

5] It is a plan view of an upsetting product obtained by the upsetting apparatus.

6] FIG. 6 is a longitudinal sectional view of a main part of the upsetting apparatus before the diameter of a predetermined portion of the material is increased by the upsetting apparatus according to the second embodiment of the present invention.

FIG. 7] A longitudinal sectional view of the main part of the upsetting apparatus in a state in which a predetermined portion of the material is being expanded by the upsetting apparatus.

8] A longitudinal cross-sectional view of the main part of the upsetting apparatus after the diameter of a predetermined portion of the material has been increased by the upsetting apparatus.

[9] It is a plan view of an upsetting product obtained by the upsetting apparatus.

[10] FIG. 10 is a longitudinal sectional view of a main part of the upsetting apparatus in a state before the predetermined portion of the material is expanded by the upsetting apparatus according to the third embodiment of the present invention.

11] It is an X-X line enlarged sectional view in FIG.

12] It is a longitudinal sectional view of the main part of the upsetting apparatus in a state in which a predetermined portion of the material is being expanded by the upsetting apparatus.

13] It is a longitudinal cross-sectional view of the main part of the upsetting apparatus after the diameter of a predetermined portion of the material is increased by the upsetting apparatus.

14] FIG. 14 is a longitudinal sectional view of an essential part of the upsetting apparatus before the predetermined portion of the material is expanded by the upsetting apparatus according to the fourth embodiment of the present invention.

FIG. 15 is an enlarged cross-sectional view taken along line YY in FIG.

16] It is a longitudinal sectional view of a main part of the upsetting apparatus in a state in which a predetermined portion of the material is being expanded by the upsetting apparatus.

FIG. 17] is a longitudinal sectional view of a main part of the upsetting apparatus after a predetermined portion of the material has been expanded in diameter by the upsetting apparatus. Explanation of symbols

1A, IB ... Upsetting machine

1… Material

2 ... Middle part

3R ... Right side (one side)

3L ... Left side (other side)

4… First exposed part

5… Second exposed part

6… 3rd exposed part

7 ... 1st enlarged diameter part

8… 2nd enlarged diameter part

9… Third diameter expansion part

10A, 10B ... Upset product

20 ... fixed die

22… First molding recess

22a… Bottom

23… Second molding recess

24… Third molding recess

31 ... 1st right guide (1st guide for one side)

31x ... Front end

32… 2nd right guide (1st side 2nd guide)

32x ... Front end

34 ... Insertion hole

1 ··· Left guide (guide for other side)

41x ... Front end

4

50R- · 'Right punch (Punch for one side) 50 · · Left punch (Punch for the other side) 6 1st right guide drive (1st guide drive for one side)

62… Second right guide drive (second guide drive for one side)

63 ··· Left guide drive (guide drive for other side)

70R ... Right punch drive (one side punch drive)

70L ... Left punch drive device (Punch drive device for other side)

81… First induction heating means (heating means)

81a ... 1st induction heating coil

82… Second induction heating means (heating means)

82a… 2nd induction heating coil

83. Third induction heating means (heating means)

83a… 3rd induction heating coil

85 ... First cooling means

85a ... Coolant flow path

86 ... Second cooling means

86a ... Coolant flow path

87. Third cooling means

87a ... Coolant flow path

91. First lubricant adhesion means

92 ... Second lubricant adhesion means

BEST MODE FOR CARRYING OUT THE INVENTION

[0107] Next, several embodiments of the present invention will be described below with reference to the drawings.

1 to 5 are schematic diagrams for explaining an upsetting method using the upsetting apparatus according to the first embodiment of the present invention.

In FIG. 1, (1A) is an upsetting apparatus according to the first embodiment, and (1) is a material.

In FIG. 5, (10A) is an upsetting additive manufactured by the upsetting apparatus (1A). In this upsetting product (10A), approximately spherical (or substantially spindle-shaped) enlarged diameter portions (7), (8), and (9) are formed at three locations of a rod-shaped shaft portion.

[0110] As shown in FIG. 1, the material (1) is a straight rod-like material such as aluminum (its Includes alloys. same as below. ). The cross-sectional shape of the material (1) is circular, and the cross-sectional area of the material (1) is set constant in the axial direction.

[0111] In the present invention, the material (1) is not limited to aluminum. For example, the material (1) may be a metal such as brass, copper, stainless steel, or a plastic. ,. Further, the cross-sectional shape of the material (1) may be a polygonal shape such as a rectangular shape or a hexagonal shape, not limited to a circular shape. The material (1) may be made of a rolled material, may be made of an extruded material, or may be made of a material manufactured by another method.

[0112] As shown in FIG. 1, the upsetting apparatus (1A) is configured to fix a fixed die (20) and one side portion (3R) of both sides (3R) (3L) in the axial direction of the material (1). Two one-side guides (31) (32) having a through hole (34) inserted and held in a buckling-prevented state and slidably movable in the axial direction, and the other side of the material (1) ( 3L) with one insertion hole (44) having an insertion hole (44) for inserting and holding the buckling prevention state and being slidable in the axial direction, and one side part (3R) of the material (1) ) In the axial direction, and a punch (50L) in the other side that axially presses the other side (3L) of the material (1). In FIG. 1, (2) is an axially intermediate portion of the material (1).

Here, in the present embodiment, it is assumed that the material (1) is arranged in the left-right direction as shown in FIG. Hereinafter, for convenience of explanation, one side (3R) of the material (1) in the axial direction (3R) (3L) is referred to as “right side” and the other side (3L) as “left side”. . Along with this, the one side guide (31) (32) is the `` right guide '', the other side guide (41) is the `` left guide '', the one side punch (50R) is the `` right punch '', The other side punch (50L) is called “left punch”.

[0114] The fixed die (20) is for fixing the material (1) so that the material (1) does not move in the axial direction during processing. The fixing die (20) is provided with a material fixing insertion hole (21) penetrating in the axial direction of the fixing die (20). The cross-sectional shape of the fitting hole (21) is a shape corresponding to the cross-sectional shape of the material (1), that is, a circular shape. The intermediate portion (2) in the axial direction of the material (1) is fitted into the fitting hole (21), thereby fixing the material (1).

[0115] Further, the fixed die (20) is divided into a plurality of (for example, two) dividing surfaces that vertically cut the fitting hole (21), that is, a split die. [0116] The two right guides (31) and (32) are arranged side by side in the axial direction. In the right guides (31) and (32), the through holes (34) of the guides (31) and (32) are provided so as to penetrate in the axial direction of the guides. The cross-sectional shape of the through hole (34) is a shape corresponding to the cross-sectional shape of the right side (3R) of the material (1), that is, a circular shape, and the material (1) passed through the through hole (34). The right side portion (3R) of the lens can be held in a buckling-prevented state and slidable in the axial direction.

In this embodiment, of the two right guides (31) and (32), the guide (31) arranged on the front side is referred to as “first right guide”, and the rear side of the first right guide (31). The guide (32) placed in is called the “second right guide”.

[0118] The first right guide (31) guides the material on the right side (3R) of the material (1) inserted into the insertion hole (34) to the fixed die (20) side, More specifically, this material is guided into a free diameter expansion space formed between the first right guide (31) and the fixed die (20).

[0119] The second right guide (32) guides the material on the right side (3R) of the material (1) inserted into the insertion hole (34) to the first right guide (31) side. More specifically, this material is guided into a free diameter-expanded space formed between the second right guide (32) and the first right guide (31).

[0120] The first right guide (31) can be divided into a plurality of pieces (for example, 2 to 4 pieces) on a dividing surface that vertically cuts the insertion hole (34). The same second right guide (32) can be divided into a plurality of pieces (for example, 2 to 4 pieces) by a dividing surface that vertically cuts the through hole (34). In the present invention, the second right guide (32) does not necessarily need to be splittable.

[0121] (25) is a holding die part for holding the second right guide (32). The holding die portion (25) is provided with a holding hole (25a), and the second right guide (32) is passed through and held in the holding hole (25a) so as to move in the axial direction.

[0122] The through hole (44) of the left guide (41) is provided so as to penetrate in the axial direction of the left guide (41) which is the same as the right guides (31) and (32). The cross-sectional shape of the through hole (44) is a shape corresponding to the cross-sectional shape of the left side (3L) of the material (1), that is, a circular shape, and the material (1 ) Can be held in a buckling-prevented state and slidably movable in the axial direction.

[0123] The left guide (41) removes the material on the left side (3L) of the material (1) inserted into the insertion hole (34). This is guided to the fixed die (20) side. More specifically, this material is guided into a free-diameter space formed between the left guide (41) and the fixed die (20).

[0124] The right punch (50R) is arranged on the right end side of the material (1), and the left punch (50L) is arranged on the left end side of the material (1).

[0125] Furthermore, the upsetting apparatus (1A) includes two right guide drive devices (61) (62) (one side guide drive device) and a left guide drive device (63) (other side portion). Guide drive device), right punch drive device (70R) (-side punch drive device), and left punch drive device (70L) (other side punch drive device).

[0126] The two right guide driving devices (61) (62) are arranged so that each right guide (31) (32) is moved by the right punch (50 R) in the moving direction (55) (ie, the right punch (50R)). It moves in the opposite direction (35) to the right side of the material (3R) (see Fig. 2). Each right guide drive device (61) (62) is connected to the corresponding right guide (31) (32).

Here, for convenience of explanation, of the right guide drive devices (61) (62), the right guide drive device (61) connected to the first right guide (31) is referred to as “first right guide drive device”. The right guide driving device (62) connected to the “device” and the second right guide (32) are respectively referred to as “second right guide driving device”.

Each right guide drive device (61) (62) has a fluid pressure cylinder (hydraulic cylinder or gas pressure cylinder) as a drive source, and the right guide (31) (32) corresponding to the drive force of this cylinder. ) Is to be moved.

In the present invention, each right guide driving device (61) (62) is configured to move the corresponding right guide (31) (32) by means of a mechanical cam, electric motor, panel, etc. It may be configured. In addition, each right guide drive device (61) (62) can make the speed of the corresponding right guide (31) (32) constant when the target shape (design shape) is determined. A device for controlling the speed is not required, but it is possible to arbitrarily change the upset shape (the shape of the enlarged diameter portion) by providing a control device for controlling the moving speed.

[0130] The left guide drive device (63) is configured so that the left guide (41) moves the left punch (50L) in the moving direction (55) (ie, the pressing direction of the material left side (3L) by the left punch (50L)). It is moved in the opposite direction (45) (see Fig. 3). The left guide driving device (63) is connected to the left guide (41). The left guide drive device (63) has a fluid pressure cylinder as a drive source. The left guide (41) is moved by the driving force of the slider.

[0131] In the present invention, the left guide driving device (63) may be configured to move the left guide (41) by a mechanical cam, an electric motor, a spring or the like. Also, this left guide drive (63) allows the speed of the left guide (41) to be constant once the target shape (design shape) is determined, so a device for controlling the speed is required. However, it is possible to arbitrarily change the upset shape (the shape of the enlarged diameter portion) by providing a control device for controlling the moving speed.

[0132] The right punch driving device (70R) moves the right punch (50R) in the axial direction of the material (1) and presses the right side (3R) of the material (1) against the right punch (50R). This is for applying a pressing force of. The right punch driving device (70R) is connected to the right punch (50R) and applies driving force to the right punch (50R) by fluid pressure (hydraulic pressure, gas pressure) or the like. This right punch drive unit (70R) can keep the speed of the right punch (50R) constant once the target shape (design shape) is determined, so a device for controlling the speed is necessary. However, it is possible to arbitrarily change the upset shape (the shape of the enlarged diameter portion) by providing a control device for controlling the pressing speed.

[0133] The left punch driving device (70L) moves the left punch (50L) in the axial direction of the material (1) and presses the left side (3L) of the material (1) against the left punch (50L). This is for applying a pressing force of. The left punch driving device (70L) is connected to the left punch (50L) and applies driving force to the left punch (50L) by fluid pressure (hydraulic pressure, gas pressure) or the like. Also, this left punch drive device (70L) can keep the speed of the left punch (50L) constant once the target shape (design shape) is determined, so a device for controlling the speed is necessary. However, it is possible to arbitrarily change the upset shape (the shape of the enlarged diameter portion) by providing a control device for controlling the pressing speed.

[0134] Next, an upsetting method using the upsetting apparatus (1A) will be described below.

First, as shown in FIG. 1, the axially intermediate portion (2) of the material (1) is inserted and arranged in the material fixing fitting hole (21) of the fixing die (20). Thereby, the material (1) is fixed so as not to move unintentionally in the axial direction at the axially intermediate portion (2).

[0136] Further, the right side (3R) of the material (1) is inserted into the insertion holes (34) (34) of the two right guides (31) (32). Through this, the right side (3R) of the material (1) is held in a buckling-prevented state and slidable in the axial direction.

[0137] Further, the left side (3L) of the material (1) is passed through the through hole (44) of the left guide (41), so that the left side (3L) of the material (1) is prevented from buckling. And slidably hold in the axial direction. In this state, the right guides (31) and (32) are arranged side by side in the axial direction.

[0138] Furthermore, an initial clearance X is provided between the first right guide (31) and the fixed die (20). The interval of the initial clearance X is the same as that of the first right guide (50R) before the movement of the right punch (50R) (that is, the pressing of the right side portion (3R) of the material by the right punch (50R)) is started. 31) and the fixed die (20) exposed below the buckling limit length (X) in the cross-sectional area of the first exposed portion (4) of the material (1) exposed between (20)

It is preferably set to a buckling limit length (less than X). In the present invention, the buckling limit

0

The length refers to the buckling limit length in the punch pressing force.

[0139] In addition, an initial clearance X is provided between the left guide (41) and the fixed die (20), which are the same as above. The interval of the initial clearance X is the same as that before starting the left punch (50L) movement (ie, pressing the left side of the material (3L) by the left punch (50L)), and the left guide (41) Less than the buckling limit length (X) in the cross-sectional area of the third exposed part (6) of the material (1) exposed between the die and the fixed die (20)

It is set below 0 (preferably less than the buckling limit length (X)).

0

Next, as shown in FIG. 2, the right punch (5 OR) is moved by operating the right punch driving device (70R), and the right side (3R) of the material (1) is moved by the right punch (50R). ) In the axial direction while operating the two right guide drive units (61) and (62), so that the two right guides (31) and (32) can be brought into close contact with each other with the right punch ( Move in the opposite direction (35) to the moving direction (55) of 50R). As a result, the first exposed portion (4) of the material (1) exposed between the first right guide (31) and the fixed die (20) is in an unconstrained state, that is, the peripheral surface of the first exposed portion (4). Is constrained and the diameter is expanded.

[0141] Also, the left punch (50L) is moved simultaneously with the right punch (50R) by operating the left punch drive (70L) simultaneously with the right punch drive (70R). As a result, the left guide (3L) is pressed by the right punch (50R) and the left guide (3L) of the material (1) is pressed in the axial direction by the left punch (50 L) while the left guide (1R) is pressed. By actuating the driving device (63), the left guide (41) is moved in the direction (45) opposite to the moving direction (55) of the left punch (50L). This will cause the left The third exposed part (6) of the material (1) exposed between the id (41) and the fixed die (20) is in an unconstrained state, that is, the peripheral surface of the third exposed part (6) is not constrained. The diameter is expanded by.

[0142] Here, it is desirable to provide a time lag t between the start of movement of the right punch (50R) and the start of movement of the first right guide (31). That is, the right of the material (1) with the right punch (50R)

0

When starting to press the side (3R), as shown in Fig. 2, first fix the position of the first right guide (31) to the initial position and then move the right punch (50R). Then, the right side portion (3R) of the material (1) is pressed in the axial direction by the right punch (50R). Then, after the lapse of time lag t

0

Subsequently, while pressing the right side (3R) of the material (1) with the right punch (50R), the right guides (31) and (32) are integrally moved in a predetermined direction (35) in a state of mutual contact. The moving speed of the right guides (31) (3 2) at this time is such that the length of the first exposed portion (4) of the material (1) is the cross-sectional area of the first exposed portion (4) of the material (1). It is controlled by the control device of both right guide drive devices (61) (62) so that it is less than the buckling limit length (preferably less than the buckling limit length).

[0143] Further, it is desirable to provide a time lag t from the start of movement of the left punch (50L) to the start of movement of the left guide (41). That is, the material (left punch (50L))

0

To start pressing the left side (3L) of 1), first fix the position of the left guide (41) to the initial position, then move the left punch (50L) to move the left punch (50L). ) Press the left side (3L) of the material (1) in the axial direction. And after the lapse of time lag t, continue to the left punch

0

The left guide (41) is moved in the predetermined direction (45) while pressing the left side (3L) of the material (1) with (50L). The moving speed of the left guide (41) at this time is the buckling limit at the cross-sectional area of the third exposed part (6) of the material (1) when the length of the third exposed part (6) of the material (1) is The left guide drive device (63) is controlled by the control device so that it is less than the length.

[0144] Note that the incremental body of material (1) that increases during the time lag t in the range of the initial clearance X

0

The product is V, and the average moving speed from the start of moving the right punch (50R) (or left punch (50L))

0

P, where S is the cross-sectional area of the right side (3R) (or left side (3L)) of the material (1) before upsetting, the time lag t is expressed as t = V / (SP).

0 0 0

[0145] In the present invention, the moving speed of the right punch (50R) may be constant or may vary. Further, the moving speed of the right guides (31) and (32) may be constant or may vary. [0146] Further, the moving speed of the left punch (50L), which is the same as above, may be constant or may vary. Further, the moving speed of the left guide (41) may be constant or it may change.

[0147] As the right punch (50R) and both right guides (31) (32) move, the first exposed part (4) force of the material (1) The first right guide (31) and the fixed die (20 ), The diameter is gradually expanded in an unconstrained state in the free diameter expansion space formed between

[0148] As the left punch (50L) and the left guide (41) move, the third exposed part (6) of the material (1) is connected to the left guide (41) and the fixed die (20). In the free diameter expansion space formed between the two, the diameter is gradually expanded in an unconstrained state.

[0149] Then, as shown in FIG. 3, when the first right guide (31) of the right guides (31) (32) reaches the stop position determined by the setting, the first right guide (31) Stop (end) the movement of. At this time, the first exposed portion (4) of the material (1) is expanded in the design shape, that is, substantially spherical (or substantially spindle-shaped). (7) is a first enlarged portion (see FIG. 5) formed by increasing the diameter of the first exposed portion (4).

[0150] Next, while pressing the right side (3R) of the material (1) with the right punch (50R), only the second right guide (32) is opposite to the movement direction (55) of the right punch (50R). Move in direction (35). As a result, the second exposed portion (5) of the material (1) exposed between the second right guide (32) and the first right guide (31) is connected to the second right guide (32) and the first right guide (31). In the free diameter expansion space formed between the guide (31), the diameter is expanded without restriction.

[0151] Then, as shown in FIG. 4, when the second right guide (32) reaches the stop position determined by design, the second right guide (32) and the right punch (50R) are moved. Stop (end). At this time, the second exposed portion (5) of the material (1) is expanded in the design shape, that is, substantially spherical (or substantially spindle-shaped). (8) is a second enlarged diameter portion (see FIG. 5) formed by increasing the diameter of the second exposed portion (5).

[0152] On the other hand, as shown in the figure, when the left guide (41) reaches the stop position determined by the design, the movement of the left guide (41) and the movement of the left punch (50L) are stopped (finished). To do. At this time, the third exposed portion (6) of the material (1) is expanded in the design shape, that is, substantially spherical (or substantially spindle-shaped). (9) is a third enlarged diameter portion (see FIG. 5) formed by increasing the diameter of the third exposed portion (6).

[0153] It is desirable that the stop time of the movement of the left guide (41) and the stop time of the movement of the second right guide (32) are the same. In this way, the material (1) is fixed by the fixing die (20). Force (ie, material fixing force) required for processing can be reduced, and reaction force acting on the fixing die (20) during processing can be reduced.

[0154] With the above procedure, upsetting of the material (1) at three locations is completed.

Next, the material (1) is removed from the insertion hole (21) of the fixed die (20) and the through hole (34) (44) of each guide (31) (32) (41). The desired upset product (10A) shown in 5 is obtained. At this time, since the first right guide (31) can be divided, the first right guide (31) of the upsetting product (10A) can be divided by dividing the first right guide (31) during removal. The removal from the through hole (34) can be performed without any trouble.

[0156] This upsetting product (10A) is used as a preform for manufacturing a linear arm for a vehicle such as an automobile or a railway vehicle (ie, a preform for a vehicle arm). In this case, each of the enlarged diameter portions (7), (8), and (9) of the upsetting product (10A) is used as a joint portion (for example, a bush mounting portion) that is connected to another member. Furthermore, this up-processed product (10A) can be used as a knuckle arm preform or the like by bending it into an arc shape or the like.

It should be noted that the upsetting apparatus and the upsetting method according to the present invention are not limited to those used for manufacturing vehicle arm preforms, but manufacture various product preforms. It is used to do.

[0158] Thus, in the upsetting process of the first embodiment, the diameter of the two portions on the right side (3R) of the material (1) can be expanded without inverting the material (1). The diameter can be expanded efficiently.

[0159] Furthermore, at the same time as the diameter expansion process for the two parts on the right side (3R) of the material (1), it is possible to perform one diameter expansion check on the left side (3L) of the material (1). Therefore, diameter expansion processing can be performed efficiently at a total of three locations of material (1).

[0160] Furthermore, since each exposed portion (4) (5) (6) of the material (1) is expanded in an unconstrained state, each exposed portion (4) (5) (6) can be moved with a low punch pressure. The diameter can be increased, so that the driving force required to drive each punch (50R) (50L) can be reduced. Further, since the diameter of the exposed portions (4), (5), and (6) can be increased without using an expensive forming die having a molding recess, the manufacturing cost can be reduced. Next, preferable processing conditions in the upsetting method according to the first embodiment will be described below.

[0162] The average movement speed from the start of the movement of the right punch (50R) is P,

G, the average moving speed from the start of movement of the first right guide (31)

The buckling limit length at the cross-sectional area of the material (1) before upsetting is X,

0

The buckling limit length at the cross-sectional area of the first expanded portion (7) formed by expanding the first exposed portion (4) of the material (1) is X,

1

The initial clearance between the first right guide (31) and fixed die (20) is X (where 0≤X≤X)

0 The time lag from the start of movement of the right punch (50R) to the start of movement of the first right guide (31) is t (where 0≤t),

0 0

The length of the first enlarged diameter part (7) is L,

The length of the material (1) before upsetting required for the first enlarged diameter part (7) is 1,

0

The upsetting time from the start of movement of the right punch (50R) is T,

And

[0163] In the case of t <T, G is

0

0≤G≤P (X -x) / (i -x -Pt) --- (

1 0 1 0

It is desirable that the following relational expression is satisfied.

[0164] When G satisfies the above relational expression (i), it is possible to reliably prevent buckling that may occur during diameter expansion processing of the first exposed portion (4).

[0165] The reason why the above relational expression (i) is set for G will be described below.

[0166] <About lower limit of G>

Since X satisfies the relation 0≤X≤X, if G is 0, the first exposure of material (1)

0

Part (4) is buckled. Therefore, the lower limit of G is 0. However, when G is 0, the punch pressing force required to expand the diameter of the first exposed portion (4) cannot be reduced. Therefore, G must be greater than 0, that is, the following equation holds.

[0167] 0≤G---(i-a)

[0168] Furthermore, it is particularly desirable that G satisfies the following relational expression (i-b).

[0169] (LX) / {(1 -L) / Pt} ≤G ••• (ib) [0170] When G satisfies the above relational expression (ib), it can satisfy the buckling that may occur during the diameter expansion processing of the first exposed portion (4). (4) can be reliably expanded to the design shape.

[0171] The reason is as follows. In other words, when the diameter of the first exposed part (4) is expanded to the design shape, the time required to become one force ^ by pressing the right punch (50R) (1_L) ZP and

0 0

The time required for the distance between the first right guide (31) and the fixed die (20) to become the X force L by the movement of the first right guide (31) is equal to {(L_X) ZG} + t I have to. Therefore,

0

It is particularly desirable that G satisfies the above relation (i-b).

[0172] <About the upper limit of G>

The position of the front end of the first right guide (31) and the length of the rear end of the material (1) before the upsetting process required for the first enlarged diameter portion (7) from the fixed die (20) When the position of

0

The upper limit of G is that the length of the first exposed portion (4) of the material (1) is less than the buckling limit length in the cross-sectional area of the first exposed portion (4) of the material (1). It becomes a condition.

[0173] However, the position of the front end of the first right guide (31) is the same as the position of the rear end of 1.

0

In this case, the following equation G-c) holds.

[0174] 1 -PT = X + G (T-t)… (g c)

0 0

[0175] From the above equation (i-c), T is represented by the following equation (i-c).

[0176] T = {1 -X + Gt} / (G + P)… (g d)

o o

[0177] Further, in order to prevent the first exposed portion (4) of the material (1) from buckling, the position of the front end portion of the first right guide (31) and the position of the rear end portion of 1 are determined. -1st of the material (1)

0

The length X + G (Τ-t) of the exposed part (4) is the buckling limit at the cross-sectional area of the first expanded part (7) of the material (1)

0

The field length must be less than X. Therefore, the following equation (i_e) holds.

1

[0178] X + G (T-t) ≤X… (i-e)

0 1

[0179] By substituting the above equation (i-d) into the above equation (i_e) and rearranging G, the following relational equation (i-f) is derived.

[0180] G≤P (X -X) / (l -X -Pt)---(i-f)

1 0 1 0

[0181] The above relational expression (i) is derived from the above expression (i_a) and the above expression (i-f).

[0182] As a matter of course, in the case of 0≤T≤t, G is G = 0. [0183] Further, it is particularly desirable that the time lag t is 0 <t. The reason is as follows

. That is, since 0 <t, the material (1) exposed in the range of the initial clearance X between the first right guide (31) and the fixed die (20) immediately after the start of the movement of the right punch (50R) The cross-sectional area of the first exposed part (4) increases. Therefore, the buckling limit length of the first exposed portion (4) of the material (1) can be increased, and buckling can be prevented more reliably.

[0184] Also, in the present invention, if the cross-sectional area of the first enlarged diameter portion (7) of the material (1) is not constant in the axial direction after upsetting, the material (1) after upsetting For example, it is desirable to adopt a cross-sectional area that takes into account the shape of the first enlarged portion (7) as the sectional area of the first enlarged portion (7). Other than where it is desirable to adopt the area, the minimum cross-sectional area of the first enlarged diameter part (7) may be adopted, or the maximum cross-sectional area of the first enlarged diameter part (7) may be adopted. Yes.

In the above relational expression (i), the first right guide (31) is the “left guide (41)”, the first exposed portion (4) is the “third exposed portion (6)”, and the first enlarged By replacing the diameter part (7) with the “third diameter expansion part (9)” and the right punch (50R) with the “left punch (50L)”, the relation (i) Is applicable. By doing so, it is possible to reliably prevent buckling that may occur during diameter expansion processing of the third exposed portion (6).

[0186] In the first embodiment, chamfering may be applied to the opening edge of the through hole (34) (44) of each guide (31) (32) (41).

6 to 9 are schematic diagrams for explaining an upsetting method using the upsetting apparatus according to the second embodiment of the present invention.

In FIG. 1, (1B) is an upsetting apparatus according to the second embodiment, and (1) is a material.

In FIG. 9, (10B) is an upsetting additive manufactured by the upsetting apparatus (1B). This upsetting product (10B) has a substantially cylindrical enlarged diameter portion (7), (8), (9) formed at three locations on the rod-shaped shaft portion.

[0189] The configuration of the upsetting apparatus (1B) of the second embodiment is that of the first embodiment (

The following description is centered on the differences from 1A).

[0190] As shown in FIG. 6, the material (1) has the same straight rod shape as the material of the first embodiment, and its cross-sectional shape is circular. [0191] In the upsetting apparatus (IB) of the second embodiment, the first forming recess (22) is provided at the axial right end of the fixed die (20). A third molding recess (24) is provided at the left end in the axial direction of the fixed die (20). Further, the upsetting apparatus (1B) includes a forming die portion (26) disposed on the rear side of the first right guide (31). The molding die portion (26) has a second molding recess (23).

[0192] Further, a first male mold part (31a) that can be fitted into the first molding recess (22) is provided in a forward projecting manner at the front end part of the first right guide (31). The front end of the second right guide (32) is provided with a second male mold part (32a) that can be fitted into the second molding recess (23) so as to protrude forward. The front end of the left guide (41) is provided with a third male part (41a) that can be fitted into the third molding recess (24) so as to protrude forward.

[0193] The other configuration of the upsetting apparatus (1B) is the same as that of the first embodiment (1A).

[0194] Next, an upsetting method using the upsetting apparatus (1B) will be described below with a focus on differences from the upsetting method of the first embodiment.

[0195] First, as shown in Fig. 6, the axially intermediate portion (2) of the material (1) is inserted into the material fixing insertion hole (21) of the fixing die (20), and the material (1) The right side (3R) of the material (1R) is placed in the first molding recess (22) and the second molding recess (23), and the left side (3L) of the material (1) is placed in the third molding recess (24). To place.

[0196] Further, the right side (3R) of the material (1) is sequentially passed through the through holes (34) (34) of the two right guides (31) (32). Further, the first male part (31a) of the first right guide (31) is fitted into the first molding recess (22) and the second male part (32a) of the second right guide (32) is inserted. ) Is fitted and inserted into the second molding recess (23).

[0197] Further, the left side portion (3L) of the material (1) is passed through and held in the through hole (44) of the left guide (41). Then, the third male part (41a) of the left guide (41) is fitted and inserted into the third molding recess (24).

[0198] Further, there is an initial gap between the front end of the first right guide (31) (specifically, the front end of the first male part (31a)) and the bottom (22a) of the first molding recess (22). It is desirable to provide clearance X. The interval between the initial clearances X is the same as that of the first right guide (50R) before the movement of the right punch (50R) (ie, pressing of the right side of the material (3R) by the right punch (50R)) is started. 31) front end and first Less than the buckling limit length (X) in the cross-sectional area of the first exposed portion (4) of the material (1) exposed between the bottom portion (22a) of the molding recess (22) (preferably the buckling limit length) (Less than (X)).

0 〇

[0199] The initial clearance X between the front end portion of the left guide (41) (specifically, the front end portion of the third male mold portion (41a)) and the bottom portion (24a) of the third molding concave portion (24). It is desirable to provide The interval of this initial alignment X is the same as that before starting the movement of the left punch (50L) (ie, pressing the left side of the material (3L) by the left punch (50L)), and the left guide (41) Less than the buckling limit length (X) at the cross-sectional area of the third exposed part (6) of the material (1) exposed between the front end of the third molding recess (24) and the bottom part (24a) of the third molding recess (24) It is set.

0

[0200] The right punch (50R) is moved by operating the right punch drive device (70R) at the next stage, and the right side (3R) of the material (1) is moved in the axial direction by the right punch (50R). The two right guide drive units (61) (62) are actuated while pressing, so that the two right guides (31) (31) are in close contact with each other in the direction of movement of the right punch (50R) ( Move in the opposite direction (35) to 55) (see Figure 7). As a result, the first exposed portion (4) of the material (1) exposed between the front end portion of the first right guide (31) and the bottom portion (22a) of the first molding recess (22) becomes the first molding. The diameter is expanded in the recess (22), that is, in a state where the entire peripheral surface of the first exposed portion (4) is constrained by the peripheral surface of the first molding recess (22).

[0201] The left punch (50L) is moved by operating the left punch drive (70L) simultaneously with the right punch drive (70R). As a result, the left guide (3L) is pressed with the left punch (50L) at the same time as the left side (3L) of the material (1) is pressed by the right punch (50R) and the left guide Move (41) in the direction (45) opposite to the direction of movement (55) of the left punch (50L). As a result, the third exposed portion (6) of the material (1) exposed between the front end portion of the left guide (41) and the bottom portion (2½) of the third molded concave portion (24) becomes the third molded concave portion (24 ), That is, in a state where the entire peripheral surface of the third exposed portion (6) is constrained by the peripheral surface of the third molding recess (24).

[0202] Here, it is desirable to provide a time lag t between the start of movement of the right punch (50R) and the start of movement of the first right guide (31).

0

[0203] Also, it is desirable to provide a time lag t from the start of movement of the left punch (50L) to the start of movement of the left guide (41).

0

[0204] As the right punch (50R) and the right guides (31) (32) move, the first exposed part (4) of the material (1) gradually expands in the first molding recess (22). It is dia. [0205] As the left punch (50L) and left guide (41) move, the third exposed part (6) of the material (1) gradually expands in the third molding recess (24). It has been done.

Then, as shown in FIG. 7, when the first right guide (31) reaches the stop position determined by the setting, the movement of the first right guide (31) is stopped (terminated). At this time, the first exposed portion (4) of the material (1) is expanded in the design shape, that is, in a substantially cylindrical shape, in the first molding recess (22). (7) is a first enlarged diameter portion (see FIG. 9) formed by increasing the diameter of the first exposed portion (4).

[0207] Next, while pressing the right side (3R) of the material (1) with the right punch (50R), only the second right guide (32) is opposite to the movement direction (55) of the right punch (50R). Move in direction (35). As a result, the second end of the material (1) exposed between the front end portion of the second right guide (32) (specifically, the front end portion of the second male mold portion (32a)) and the first right guide (31). The exposed portion (5) is expanded in diameter in the second molding recess (23).

Then, as shown in FIG. 8, when the second right guide (32) reaches the stop position determined by design, the second right guide (32) and the right punch (50R) are moved. Stop (end). At this time, the second exposed portion (5) of the material (1) is expanded in the design shape, that is, in a substantially cylindrical shape, in the second molding recess (23). (8) is a second enlarged diameter portion (see FIG. 9) formed by increasing the diameter of the second exposed portion (5).

On the other hand, as shown in the figure, when the left guide (41) reaches the stop position determined by the design, the movement of the left guide (41) and the movement of the left punch (50L) are stopped (finished). To do. At this time, the third exposed portion (6) of the material (1) is expanded in the design shape, that is, in a substantially cylindrical shape, in the third molding recess (24). (9) is a third enlarged portion (see FIG. 9) formed by expanding the third exposed portion (6).

[0210] It is desirable that the stop time of the left guide (41) and the stop time of the second right guide (32) be the same.

[0211] With the above procedure, upsetting of the material (1) at three locations is completed.

[0212] Next, the material (1) is removed from the insertion hole (21) of the fixed die (20) and the through hole (34) (44) of each guide (31) (32) (41). The desired upset product (10B) shown in 9 is obtained.

[0213] This upsetting product (10B) is the same as the upsetting product (10A) of the first embodiment. For example, it can be used as a preform for a vehicle arm.

[0214] Note that the upsetting apparatus and the upsetting method according to the present invention are not limited to those used for manufacturing vehicle arm preforms, but manufacture various product preforms. It is used to do.

[0215] Thus, in the upsetting process of the second embodiment, the exposed portions (4), (5), and (6) of the material (1) are respectively formed into the corresponding molding recesses (22), (23), and (24). The diameter of the design is expanded

(7) (8) (9) can be reliably formed.

[0216] Next, preferable processing conditions in the upsetting method of the second embodiment will be described below.

[0217] The average movement speed from the start of the movement of the right punch (50R) is P,

0

The initial clearance between the front end of the first right guide (31) and the bottom (22a) of the first molding recess (22) is X (where 0≤X≤X),

0

The length of the material before the upsetting process required for the first expanded portion (7) formed by expanding the first exposed portion (4) is L,

0

The stop position of the tip of the right punch (50R) obtained from the design volume of the first enlarged diameter part (7) with respect to the first molding concave part (22) bottom part (22a) is X,

P

The stop position of the front end of the first right guide (31) determined by design with respect to the first molding recess (22) bottom (22a) is X,

g

The time lag from the start of movement of the right punch (50R) to the start of movement of the first right guide (31) is t (where 0≤t),

0 0

And

[0218] In this upsetting method, G preferably satisfies the following equation (ii).

[0219] G = P (X -X) / (L -X -Pt)

g 0 P 0

[0220] Since G satisfies the above formula (ii), the force S can be ensured to surely expand the diameter of the first exposed portion (4) to the design shape.

[0221] The reason why the above equation (ii) is set for G will be described below. [0222] Force at start of movement of right punch (50R) If the time until the end of diameter expansion of the first exposed part (4) (that is, the processing time of the first exposed part (4)) is t, the first exposed part At the end of diameter expansion processing in (4), the distance between the front end of the right punch (50R) and the bottom (22a) of the first molding recess (22), that is, the front end of the right punch (50R) The position X relative to the first molding recess (22) bottom (22a) is expressed by the following equation (ii_a)

P

Given in.

[0223] L -Pt = X---(ii-a)

0 P

.-. t = (L -X) / P---(ii-b)

0 P

[0224] Further, the distance between the front end portion of the first right guide (31) and the bottom portion (22a) of the first molding recess (22) at the end t of the diameter expansion processing of the first exposed portion (4), that is, The position X of the front end portion of the first right guide (31) with respect to the first forming concave portion (22) and the bottom portion (22a) is given by the following equation (ii_c).

P

[0225] X + G (t-t) = X

o g

[0226] By substituting equation (ii-b) into equation (ii-c) and rearranging G, equation (ii) is derived.

[0227] In the second embodiment, chamfering may be applied to the opening edge of the through hole (34) (44) of each guide (31) (32) (41).

10 to 13 are schematic views for explaining an upsetting method using the upsetting apparatus according to the third embodiment of the present invention.

In FIG. 10, (1C) is an upsetting apparatus according to the third embodiment. In FIG. 10, the same components as those of the upsetting apparatus (1A) according to the first embodiment shown in FIGS. 1 to 5 are denoted by the same reference numerals. Hereinafter, the configuration of the upsetting apparatus (1C) of the third embodiment will be described focusing on the differences from the upsetting apparatus (1A) of the first embodiment.

[0230] The upsetting product manufactured by the upsetting apparatus (1C) of the third embodiment is the same as the upsetting product (10A) shown in FIG.

[0231] In the third embodiment, the material (1) has a round bar shape, and more specifically, a solid round bar shape. Furthermore, the material (1) is made of a rolled material, and is, for example, rolled into a round bar with a rolling roll, that is, manufactured by roll rolling. Furthermore, this material (1) is made of a forged rolled material in detail. It consists of a continuous forged rolled material produced by a known probelch method. However, in the present invention, the rolled material is not limited to the continuous forged rolled material manufactured by the Properti method, but may be a rolled material manufactured by other methods.

[0232] The forged rolled material refers to, for example, a material produced by rolling a forged product. In this case, for example, a forged product obtained by a known forging method such as a unidirectional solidification forging method is used.

[0233] The cross-sectional shape of the material (1) is circular (substantially circular), but when the cross-section of the material (1) is enlarged as shown in Fig. 11, the cross-sectional shape of the material (1) is It has a hexagonal shape or more. For this reason, the roundness of the cross section of the material (1) is lower than that of a material made of a round bar-like extruded material.

[0234] The upsetting apparatus (1C) of the third embodiment includes all the components of the upsetting apparatus (1A) of the first embodiment and three heating means (81) (82) (83), three cooling means (8 5) (86) (87), and one or more (two in this embodiment) lubricant adhering means (91) (92) Yes.

[0235] As shown in Fig. 11, the cross-sectional shape of the through hole (34) of the second guide (32) is circular. The roundness of the through hole (34) is higher than the roundness of the cross section of the material (1). The diameter of each insertion hole (34) is set to be the same as or slightly larger than the maximum diameter of the material (1). Therefore, as shown in FIG. 11, when the material (1) is passed through the through hole (34), the surface of the material (1) and the peripheral surface of the through hole (34) A slight gap (K) is inevitably generated. Furthermore, for the same reason, there is a slight gap (K) between the surface of the material (1) and the peripheral surface of the through hole (34) of the first right guide (31). Further, a slight gap (K) is generated between the surface of the material (1) and the peripheral surface of the through hole (44) of the third guide (41).

[0236] The three heating means (81) (82) (83) have the same configuration. Of these three heating means (81), (82) and (83), the first heating means (81) is the front end of the first right guide (31) at the right side (3R) of the material (1) ( The part (llx) corresponding to 31x) is locally heated. The second heating means (82) locally heats the portion (12x) corresponding to the front end (32x) of the second right guide (32) in the right side (3R) of the material (1). It is. The third heating means (33) is a portion (1) corresponding to the front end (41x) of the left guide (41) in the left side (3L) of the material (1). 3x) is heated locally.

[0237] The first heating means (81) includes a first induction heating coil (81a) and a first power source (not shown) that supplies an alternating current (alternating voltage) to the coil (81a). Induction heating means. The surface of the coin (3 la) is covered with an insulating layer (not shown) made of an insulating tape or the like. Further, the coil (31a) is mounted inside the front end (31x) of the first right guide (31) so as to surround the through hole (34).

[0238] The first right guide (31) is made of a heat-resistant hard non-conductive material such as ceramic, or a heat-resistant hard conductive material (eg, steel) (for example: Heat-resistant metal material).

[0239] In this first induction heating means (81), when a current (voltage) of a predetermined frequency (eg, high frequency or low frequency) is supplied to the coil (81a) by the power supply unit, the coil (81a) uses the material (1 ) On the right side (3R) of the first right guide (31) corresponding to the front end (31x) (l lx) is configured to be induction-heated locally. Furthermore, the first induction heating means (81) increases the induction heating temperature of the part (1 lx) of the material (1) by increasing the amount of current supplied to the coil (81a) and the like. (L lx) can be heated to a semi-molten state.

[0240] The second heating means (82) includes a second induction heating coil (82a) and a second induction heating unit (82b) that supplies an alternating current (alternating voltage) to the coinore (82a). Means. The surface of the coil (82a) is covered with an insulating layer (not shown) made of insulating tape or the like. Further, this coil (82a) is carried inside the front end portion (32x) of the second right guide (32) so as to surround the through hole (34).

[0241] The second right guide (32) is made of, for example, a hard non-conductive material having heat resistance such as ceramic, or a hard conductive material having heat resistance such as steel (eg: Heat-resistant metal material).

[0242] In the second induction heating means (82), when a current (voltage) of a predetermined frequency (eg, high frequency or low frequency) is supplied to the coil (82a) by the power source (82b), the coil (82a) Thus, the portion (12x) corresponding to the front end portion (32x) of the second right guide (32) in the right side portion (3R) of the material (1) is locally induction-heated. Furthermore, this second induction heating means (82) By increasing the amount of current supplied to the coil (82a), etc., the induction heating temperature of the specified part (12x) of the material (1) can be raised to heat the part (12x) to a semi-molten state Has been.

[0243] The third heating means (83) includes a third induction heating coil (83a) and a third induction heating unit (83b) that supplies an alternating current (alternating voltage) to the coil (83a). Means. The surface of the coil (83a) is covered with an insulating layer (not shown) made of an insulating tape or the like. Further, the coil (83a) is mounted inside the front end (41x) of the left guide (41) so as to surround the through hole (44).

[0244] The left guide (41) is made of a hard non-conductive material having heat resistance such as ceramic or a hard conductive material having heat resistance such as steel (eg, heat resistance). Metal material).

[0245] In the third induction heating means (83), when a current (voltage) of a predetermined frequency (eg, high frequency or low frequency) is supplied to the coil (83a) by the power source (83b), the coil (83a) Thus, the portion (13x) corresponding to the front end (41x) of the left guide (41) in the left side (3L) of the material (1) is locally induction-heated. Further, the third induction heating means (83) increases the induction heating temperature of the predetermined portion (13x) of the material (1) by increasing the amount of current supplied to the coil (83a) and the like. The part (13x) can be heated to a semi-molten state.

[0246] The three cooling means (85) (86) (87) have the same configuration. Of these three cooling means (85), (86) and (87), the first cooling means (85) is the front end of the first right guide (31) at the right side (3R) of the material (1) ( The part (lly) corresponding to the part behind 31x) is locally cooled. Further, the second cooling means (86) has a portion (12y) corresponding to a portion on the rear side of the front end portion (32x) of the second right guide (32) in the right side portion (3R) of the material (1). Cooling. In addition, the third cooling means (87) locally places a part (13y) corresponding to a part of the left side (3L) of the material (1) on the rear side of the front end part (41x) of the left guide (41). Is to cool

[0247] The first cooling means (85) has a coolant flow path (85a) provided in the inner part of the region from the front end (31x) to the rear end of the first right guide (31). Yes. The first cooling means (85) By allowing a coolant such as coolant to flow through the coolant flow passage (85a), the rear side of the first right guide (31) on the right side (3R) of the material (1) (31x) The part corresponding to the part on the side (lly) is configured to be locally cooled.

[0248] The second cooling means (86) has a coolant flow path (86a) provided inside the rear end of the second right guide (32). Then, the second cooling means (86) distributes the cooling liquid such as cooling water in the cooling liquid flow passage (86a), so that the second right guide (3R) on the right side (3R) of the material (1) ( The part (12y) corresponding to the part behind the front end part (32x) of 32) is locally cooled.

[0249] The third cooling means (87) has a coolant flow path (87a) provided inside the rear end of the left guide (41). Then, the third cooling means (87) distributes the coolant such as coolant through the coolant flow passage (87a), so that the left guide (41) of the left guide (41) of the material (1) is left. The part (13y) corresponding to the part behind the front end (41x) is locally cooled.

[0250] The two lubricant attaching means (91) and (92) have the same configuration. Of these two lubricant attaching means (91) and (92), the first lubricant attaching means (91) is a through hole (34 in the first right guide (31) and the second right guide (32)). ) A lubricant (not shown) is attached to each of the peripheral surfaces of (34). The second lubricant adhering means (92) adheres the lubricant to the peripheral surface of the through hole (44) of the left guide (41).

[0251] The lubricant reduces the frictional resistance between the surface of the material (1) and the peripheral surface of the through hole (34) (34) (44) of each guide (31) (32) (41). Is for. As this lubricant, for example, a liquid lubricant such as an oil-based lubricant is used. For example, “Oildag” (trade name) manufactured by Japan Atchison Co., Ltd., “ Daphne Dyna Draw "(trade name) is used.

[0252] The first lubricant adhering means (91) includes a nozzle (91a) for ejecting the lubricant, and a lubricant supply section (91b) for supplying the lubricant to the nozzle (91a). Then, by ejecting a lubricant from the nozzle (91a), the lubricant is removed from the peripheral surface of the through hole (34) of the first right guide (31) and the through hole ( It is configured to spray and adhere to the peripheral surface of 34). [0253] However, in the present invention, the first lubricant adhering means (91) may also be applied by spraying a lubricant onto the surface of the right side portion (3R) of the material (1). The lubricant may be sprayed and adhered to both the peripheral surface of the through hole (34) and the surface of the right side (3R) of the material (1).

[0254] The second lubricant adhering means (92) includes a nozzle (92a) for ejecting the lubricant and a lubricant supply section (92b) for supplying the lubricant to the nozzle (92a). The Then, the lubricant is jetted from the nozzle (92a) to spray the lubricant onto the peripheral surface of the through hole (44) of the left guide (41).

[0255] However, in the present invention, the second lubricant adhering means (92) may also be one in which a lubricant is sprayed and adhered to the surface of the left side (3L) of the material (1). The lubricant may be sprayed and adhered to both the peripheral surface of the through hole (44) and the surface of the left side (3L) of the material (1).

[0256] Next, an upsetting method using the upsetting apparatus (1C) of the third embodiment will be described below.

[0257] First, lubricant is attached to the peripheral surfaces of the insertion holes (34) (34) (44) of the guides (31) (32) (41) by the corresponding lubricant attaching means (91) (92). To attach. Furthermore, it is also possible to attach a lubricant to the surface of the right side (3R) and left side (3L) of the material (1).

[0258] Next, as shown in Fig. 10, the axially intermediate portion (2) of the material (1) is inserted into the material fixing fitting hole (21) of the fixing die (20). As a result, the material (1) is fixed so as not to move in the axial direction.

[0259] Further, the right side (3R) of the material (1) is sequentially passed through the through holes (34) (34) of the first right guide (31) and the second right guide (32). In this state, as shown in FIG. 11, the clearance (K) between the surface of the right side (3R) of the material (1) and the peripheral surface of each through hole (34) (34) Lubricant (not shown) adhering to the peripheral surface of the hole (34) (34) enters due to capillary action or the like, and the lubricant is temporarily stored in the gap (K).

[0260] Further, the left side portion (3L) of the material (1) is placed through the through hole (44) of the left guide (41). In this state, lubrication adhered to the peripheral surface of the through hole (44) in the gap between the surface of the left side (3L) of the same material (1) as above and the peripheral surface of the through hole (44) The agent is temporarily stored. [0261] Further, by supplying a current of a predetermined frequency to the coil (81a) of the first induction heating means (81) by the power supply unit, the first right guide (3R) on the right side (3R) of the material (1) ( The part (l lx) corresponding to the front end part (31x) of 31) is locally induction-heated to a predetermined temperature. Thereby, the deformation resistance in the said part (l lx) of the raw material (1) falls locally.

[0262] The heating temperature is not particularly limited as long as the deformation resistance of the part (l lx) of the material (1) is reduced, but a suitable heating temperature is specifically exemplified. Then, it is as follows.

[0263] For example, when the material of the material (1) is aluminum or an aluminum alloy, a preferable heating temperature range is 200 to 580 ° C (particularly preferably 350 to 540 ° C). Furthermore, when the part (l lx) of the material (1) is locally heated to a semi-molten state, a suitable heating temperature range is 580 to 625 ° C (particularly preferably 600 to 615 ° C), etc. Power S is mentioned. However, the present invention is not limited to the heating temperature within the above range.

[0264] Furthermore, by allowing a coolant such as room temperature coolant to flow through the coolant flow passageway (85a) of the first cooling means (85), the first right of the right side (3R) of the material (1) A portion (l ly) corresponding to a portion on the rear side of the front end portion (31 X) of the guide (31) is locally cooled. Thereby, the fall of the deformation resistance in the said part (lly) of the raw material (1) can be suppressed.

[0265] A suitable cooling temperature range in this case includes, for example, 30 to 80 ° C (particularly preferably 40 to 60 ° C). However, the present invention is not limited to the cooling temperature within the above range.

[0266] On the other hand, no current is supplied to the coil (82a) of the second induction heating means (82), and therefore the material

The part (12x) corresponding to the front end (32x) of the second right guide (32) in the right side (3R) of (1) is not heated. Therefore, the deformation resistance at the part (12x) of the material (1) does not decrease.

[0267] Further, by allowing a coolant such as room temperature coolant to flow through the coolant flow passageway (86a) of the second cooling means (86), the second right side (3R) of the material (1) A portion (12y) corresponding to a portion on the rear side of the front end portion (32X) of the guide (32) is locally cooled. Thereby, the fall of the deformation resistance in the said site | part (12y) of a raw material (1) can be suppressed.

[0268] In this case, the preferable range of the cooling temperature is the same as the above range. [0269] Furthermore, by supplying a current of a predetermined frequency to the coil (83a) of the third induction heating means (83) by the power supply unit (83b), the left guide on the left side (3L) of the material (1) The part (13x) corresponding to the front end (41x) of (41) is locally induction-heated to a predetermined temperature. As a result, the deformation resistance of the material (1) at the part (13x) is locally reduced.

[0270] The heating temperature is not particularly limited as long as the deformation resistance of the portion (13x) of the material (1) is reduced, but a suitable heating temperature is specifically exemplified. The preferable heating temperature range is the same as the above range.

[0271] Further, by allowing a coolant such as room temperature coolant to flow through the coolant flow passageway (87a) of the third cooling means (87), the left guide (3L) of the material (1) is left ( The part (13y) corresponding to the part behind the front end part (41x) of 41) is locally cooled. Thereby, the fall of the deformation resistance in the said site | part (13y) of a raw material (1) can be suppressed.

[0272] The preferable range of the cooling temperature in this case is the same as the above range.

[0273] Next, while maintaining such a state, the first exposed portion (4) and the third exposed portion (1) of the material (1) are subjected to the same procedure as the upsetting method shown in the first embodiment. At the same time, the diameter is expanded in an unconstrained state.

[0274] Then, as shown in FIG. 12, when the first exposed portion (4) of the material (1) is expanded in the design shape, that is, substantially spherical (or substantially spindle-shaped), the second induction heating means The front end of the second right guide (32) on the right side (3R) of the material (1) by supplying current of a predetermined frequency to the coil (82a) of (82) by the power source (82b) The part (12x) corresponding to (32x) is induction-heated locally to a predetermined temperature. As a result, the deformation resistance of the material (1) at the part (12x) is locally reduced.

[0275] The heating temperature is not particularly limited as long as the deformation resistance of the part (12x) of the material (1) is reduced, but a suitable heating temperature is specifically exemplified. The preferable heating temperature range is the same as the above range.

[0276] Further, by continuously circulating the coolant in the coolant flow path (86a) of the second cooling means (86), the second right guide (32) of the right side (3R) of the material (1) The part (12y) corresponding to the part behind the front end (32x) is locally cooled. Thereby, the fall of the deformation resistance in the said part (12y) of a raw material (1) can be suppressed. [0277] Next, while maintaining such a state, the second exposed portion (5) of the material (1) is obtained by the same procedure as the upsetting method shown in the first embodiment as shown in FIG. ) And the third exposed part (6) are simultaneously expanded in an unconstrained state.

[0278] With the above procedure, upsetting of the material (1) at three locations is completed.

[0279] Next, the material (1) is taken out from the fitting hole (21) of the fixed die (20) and the through hole (34) (34) (44) of each guide (31) (32) (41). The desired upsetting product (1

OA) is obtained.

[0280] Thus, the upsetting method of the third embodiment has the following advantages in addition to the advantages of the upsetting method of the first embodiment.

That is, since the material (1) is made of a round bar-shaped rolled material, the material (1) can be obtained or manufactured at a low cost. Therefore, the processing cost can be reduced.

[0282] Furthermore, since the material (1) is made of a forged rolled material, the material (1) can be obtained or manufactured at a lower cost. Therefore, the processing cost can be further reduced. In addition, since the material (1) is made of a continuous forged rolled material manufactured by the probe method, the material (1) can be obtained or manufactured even more inexpensively. Therefore, the processing cost can be further reduced.

[0283] Therefore, according to the upsetting method of the fourth embodiment, an inexpensive upsetting product (10A) can be provided.

[0284] Furthermore, this material (1) has a lower roundness than a round bar material made of extruded material. Therefore, when this material (1) is passed through the through holes (34) (34) (44) of the guides (31) (32) (41), as described above, the surface of the material (1) A gap (K) inevitably occurs between the hole and the peripheral surface of the through hole (34) (34) (44) (see Fig. 11). Therefore, the contact area between the two is small. Therefore, the frictional resistance force when the material (1) slides in the axial direction in the through holes (34) (34) (44) of the guides (31) (32) (41) during caloring is small. Therefore, the molding pressure can be reduced. For this reason, a small punch drive device (70R) (70L) that moves each punch (50R) (50L) can be used, and the installation space for the upsetting device (1C) can be saved. It is out.

[0285] Furthermore, since the molding pressure can be reduced, the following advantages are obtained. That is, if the molding pressure is high, the end of the material (1) is guided by the pressing force from each punch (50R) (50L) ( 32) It often occurs that it is crushed in the through hole (34) (44) of (41). As a result, a part of the material (1) enters the gap between the peripheral surface of each punch (50R) (50L) and the peripheral surface of the through hole (34) (44). As a result, the molding pressure increases, and as a result, the punches (50R) and (50L) cannot move in the pressing direction in the through holes (34) and (44), resulting in a problem that machining becomes impossible. Therefore, by reducing the molding pressure, such a problem does not occur, and therefore, the material (1) can be diameter-expanded satisfactorily over a long region.

[0286] Moreover, since the lubricant is adhered to the peripheral surfaces of the through holes (34), (34), and (44) of the guides (31), (32), and (41), the following advantages are obtained. That is, since a gap (K) is generated between the surface of the material (1) and the peripheral surface of the insertion hole (34) (34) (44), the lubricant enters the gap (K). To be temporarily stored. Thereby, the spraying of the lubricant to the peripheral surfaces of the insertion holes (34) (34) (44) and the surface of the material (1) is promoted. That is, as the material (1) slides in the through hole (34) (34) (44) in the axial direction during machining, the lubricant in the gap (K) is inserted into the insertion hole (34) ( 34) It spreads on the peripheral surface of (44) and the surface of the material (1). As a result, the frictional resistance force between the peripheral surface of the through hole (34) (34) (44) and the surface of the material (1) can be reliably reduced, that is, the forming pressure can be reliably reduced.

[0287] Furthermore, the part (l lx) (12x) (13x) corresponding to the front end (31x) (32x) (41x) of each guide (31) (32) (41) in the material (1) is locally By induction heating, the deformation resistance at the part (l lx) (12x) (13x) of the material (1) is locally reduced, so that the molding pressure can be reduced.

[0288] On the other hand, the part (l ly) (12y) corresponding to the part behind the front end (31x) (32x) (41x) of each guide (31) (32) (41) in the material (1) Since (13y) is not heated, the deformation resistance does not decrease. Therefore, the material (1) swells in the through hole (34) (34) (44) of each guide (31) (32) (41) by the pressing force from the punch (50R) (50L). It is possible to prevent the molding pressure from increasing.

[0289] Furthermore, by subjecting a predetermined part (l lx) (12x) (13x) of the material (1) to induction heating locally by induction heating means (85) (86) (87), the material (1 ) Predetermined part (l lx) (12x) (13x) can be reliably and extremely efficiently heated.

[0290] Furthermore, in the present invention, by increasing the heating temperature, the predetermined part (l lx) (12x) of the material (1) (13x) may be heated to a semi-molten state. In this case, the molding pressure can be greatly reduced. In this case, the upsetting process falls within the category of thixo molding.

[0291] Further, the part (l ly) (12y) corresponding to the part behind the front end part (31x) (32x) (41x) of each guide (31) (32) (41) in the material (1) Since (13y) is locally cooled, it is possible to surely prevent the part (lly) (12y) (13y) of the material (1) from being heated. Therefore, it is possible to reliably suppress a decrease in deformation resistance at the portion (lly) (12y) (13y) of the material (1).

[0292] In the third embodiment, the portion (l lx) (12x) corresponding to the front end (31x) (3 2x) (41x) of each guide (31) (32) (41) in the material (1) (13x) is induction-heated locally by induction heating means (85) (86) (87). However, in the present invention, the front end portions (31x) (32x) (41x) of the guides (31) (32) (41) are locally induction-heated by the induction heating means (85) (86) (87), As a result, the portion (llx) (12x) (13x) corresponding to the front end portion (31x) (32x) (41x) of each guide (31) (32) (41) in the material (1) is moved to each guide (31 ) (32) The front end (31x) (32x) (41x) of (41) may be locally heated. That is, the heat of the front end (31x) (32x) (41x) of each guide (31) (32) (41) is conducted to the relevant part (l lx) (12x) (1 3x) of the material (1). Accordingly, the part (l lx) (12x) (13x) of the material (1) may be locally heated. In this case, the predetermined part (l lx) (12x) (13x) of the material (1) can be reliably and efficiently heated. In this case, each guide (31) (32) (41) is preferably made of a heat-resistant conductive material (eg, heat-resistant metal material) such as steel.

14 to 17 are schematic diagrams for explaining an upsetting method using the upsetting apparatus according to the fourth embodiment of the present invention.

In FIG. 14, (1D) is an upsetting apparatus according to the fourth embodiment. In FIG. 14, the same components as those of the upsetting apparatus (1B) according to the second embodiment shown in FIGS. 6 to 9 are denoted by the same reference numerals. Hereinafter, according to the configuration of the upsetting apparatus (1D) of the fourth embodiment, the upsetting apparatus (1B) of the second embodiment and the upsetting apparatus of the third embodiment ( The difference from 1C) will be mainly described.

[0295] The upsetting product manufactured by the upsetting apparatus (1D) of the fourth embodiment is the same as the upsetting product (10B) shown in FIG.

[0296] In the fourth embodiment, the material (1) is rolled in the same round bar shape as the material of the third embodiment. More specifically, it is made of a forged rolled material, and more specifically, it is made of a continuously forged rolled material produced by a known probelch method.

[0297] The cross-sectional shape of the material (1) is circular (substantially circular), but when the cross-section of the material (1) is enlarged as shown in Fig. 15, the cross-sectional shape of the material (1) is It has a hexagonal shape or more. For this reason, the roundness of the cross section of the material (1) is lower than that of a material made of a round bar-like extruded material.

[0298] The upsetting apparatus (1D) of the fourth embodiment is the upsetting apparatus of the second embodiment (

1B), all three heating means (81) (82) (83), three cooling means (8 5) (86) (87), one or more ( In this embodiment, two lubricant attaching means (91) and (92) are provided.

[0299] Further, as shown in FIG. 15, the cross-sectional shape of the through hole (34) of the second guide (32) is circular. The roundness of the through hole (34) is higher than the roundness of the cross section of the material (1). The diameter of each insertion hole (43) is set to be the same as or slightly larger than the maximum diameter of the material (1). Therefore, as shown in FIG. 15, when the material (1) is inserted through the through hole (34), there is a slight gap between the surface of the material (1) and the peripheral surface of the through hole (34). A gap (K) is inevitably generated in the case. Furthermore, for the same reason, there is a slight gap (K) between the surface of the material (1) and the peripheral surface of the through hole (34) of the first right guide (31). Further, a slight gap (K) is generated between the surface of the material (1) and the peripheral surface of the insertion hole (44) of the third guide (41).

[0300] The three heating means (81) (82) (83) have the same configuration. Of these three heating means (81), (82) and (83), the first heating means (81) is the front end of the first right guide (31) at the right side (3R) of the material (1) ( The part (l lx) corresponding to 31x) is locally heated. The second heating means (82) locally heats the portion (12x) corresponding to the front end (32x) of the second right guide (32) in the right side (3R) of the material (1). It is. The third heating means (83) locally heats the portion (4 lx) corresponding to the front end (41x) of the left guide (41) in the left side (3L) of the material (1). .

[0301] The first heating means (81) includes a first induction heating coil (81a) and a first power source (not shown) that supplies an alternating current (alternating voltage) to the coil (81a). Induction heating means. The surface of the coin (8 la) is covered with an insulating layer (not shown) made of an insulating tape or the like. In addition, this The coil (81a) is mounted inside the fixed die (20) so as to surround the first molding recess (22).

[0302] The first right guide (31) is made of a hard conductive material having heat resistance (eg, heat resistant metal material) such as steel. The same fixed die (20) is made of a hard conductive material having heat resistance (eg, heat resistant metal material) such as steel.

[0303] In this first induction heating means (81), when a current (voltage) of a predetermined frequency (eg, high frequency or low frequency) is supplied to the coil (81a) by the power source, the coil (81a) The front end part (31x) of the guide (31) (specifically, the front end part (31x) of the male part (31a)) is locally induction-heated, whereby the right side part (3R) of the material (1) The part (l lx) force corresponding to the front end part (31x) of the first right guide (31) at is configured to be heated locally by the heat of the front end part (31x) of the first right guide (31). Yes. That is, the heat of the front end (31x) of the first right guide (31) is conducted to the part (l lx) of the material (1), and the part (l lx) of the material (1) is locally heated. It is configured to be. Further, the first induction heating means (81) increases the heating temperature of the part (l lx) of the material (1) by increasing the amount of current supplied to the coil (81a) and the like ( 1 lx) is configured to be heated to a semi-molten state.

[0304] The second heating means (82) includes a second induction heating coil (82a) and a second induction heating unit (82b) that supplies an alternating current (alternating voltage) to the coil (82a). Means. The surface of the coil (82a) is covered with an insulating layer (not shown) made of insulating tape or the like. Further, the coil (82a) is mounted in a manner surrounding the second molding recess (23) inside the molding die portion (26) of the fixed die (20).

[0305] The second right guide (32) is made of a hard conductive material having heat resistance (eg, heat resistant metal material) such as steel.

[0306] In the second induction heating means (82), when a current (voltage) of a predetermined frequency (eg, high frequency or low frequency) is supplied to the coil (82a) by the power supply unit (82b), the coil (82a) To the front end (32x) of the second right guide (32) (specifically, the front end (32x) of the male part (32a)) is locally induction-heated, so that the material (1) The part (12x) corresponding to the front end (32x) of the second right guide (32) in the right side (3R) is locally heated by the heat of the front end (32x) of the second right guide (32). It is configured as follows. That is, the second right guide ( The front end portion (32x) of 32) conducts and the part (12x) of the material (1) is heated locally. Further, the second induction heating means (82) increases the heating temperature of the part (12x) of the material (1) by increasing the amount of current supplied to the coil (82a) and the like (12x ) Can be heated to a semi-molten state.

[0307] The third heating means (83) includes a third induction heating coil (83a) and a third induction heating unit (83b) that supplies an alternating current (alternating voltage) to the coil (83a). Means. The surface of the coil (83a) is covered with an insulating layer (not shown) made of an insulating tape or the like. Furthermore, this coil (83a) is carried in the fixed die (20) so as to surround the third molding recess (24).

[0308] The left guide (41) is made of a hard conductive material having heat resistance (eg, heat resistant metal material) such as steel.

[0309] In the third induction heating means (83), when a current (voltage) of a predetermined frequency (eg, high frequency or low frequency) is supplied to the coil (83a) by the power supply unit (83b), the coil (83a) To the front end (41x) of the left guide (41) (specifically, the front end (41x) of the male part (41a)) is locally induction-heated, so that the left side ( The part (13x) force corresponding to the front end (41x) of the left guide (41) in 3L) is configured to be locally heated by the heat of the front end (41x) of the left guide (41). That is, heat of the front end (4 lx) of the left guide (41) is conducted to the part (13x) of the material (1) so that the part (13x) of the material (1) is locally heated. It is configured. Further, the third induction heating means (83) increases the heating temperature of the part (13x) of the material (1) by increasing the amount of current supplied to the coil (83a) and the like ( 1 3x) can be heated to a semi-molten state.

[0310] The three cooling means (85) (86) (87) have the same configuration. Of these three cooling means (85), (86) and (87), the first cooling means (85) is the front end of the first right guide (31) at the right side (3R) of the material (1) ( The part (lly) corresponding to the part behind 31x) is locally cooled. Further, the second cooling means (86) has a portion (12y) corresponding to a portion on the rear side of the front end portion (32x) of the second right guide (32) in the right side portion (3R) of the material (1). Cooling. In addition, the third cooling means (87) locally places a part (13y) corresponding to a part of the left side (3L) of the material (1) on the rear side of the front end part (41x) of the left guide (41). Is to cool [0311] The first cooling means (85) has a coolant flow path (85a) provided inside the rear end of the first right guide (31). Then, the first cooling means (85) distributes the cooling liquid such as cooling water in the cooling liquid flow passage (85a), thereby the first right guide (3R) in the right side (3R) of the material (1). The part (lly) corresponding to the part behind the front end part (31x) of 31) is locally cooled.

[0312] The second cooling means (85) has a coolant flow path (86a) provided inside the rear end of the second right guide (32). Then, the second cooling means (86) distributes the cooling liquid such as cooling water in the cooling liquid flow passage (86a), so that the second right guide (3R) on the right side (3R) of the material (1) ( The part (12y) corresponding to the part behind the front end part (32x) of 32) is locally cooled.

[0313] The third cooling means (87) has a coolant flow path (87a) provided in the rear end portion of the left guide (41). Then, the third cooling means (87) distributes the coolant such as coolant through the coolant flow passage (87a), so that the left guide (41) of the left guide (41) of the material (1) is left. The part (13y) corresponding to the part behind the front end (41x) is locally cooled.

[0314] Reference numeral (88) denotes a coolant flow path provided inside the forming die portion (26) of the fixed die (20). The coolant flow passageway (88) allows the heat generated by the coinlet (82a) of the first induction heating means (82) to flow to other parts of the stationary die (20) by circulating the coolant inside. It suppresses conduction. (89) is a coolant flow path provided inside the left end of the fixed die (20). The coolant flow passageway (89) allows the heat generated by the coinlet (83a) of the third induction heating means (83) to flow to other parts of the stationary die (20) by allowing the coolant to flow therethrough. It suppresses conduction.

[0315] The two lubricant adhering means (91) and (92) have the same configuration. Of these two lubricant attaching means (91) and (92), the first lubricant attaching means (91) is a through hole (34 in the first right guide (31) and the second right guide (32)). ) A lubricant (not shown) is attached to each of the peripheral surfaces of (34). The second lubricant adhering means (92) adheres the lubricant to the peripheral surface of the through hole (44) of the left guide (41). [0316] The configuration and usage of each lubricant adhesion means (91) (92) are the same as the lubricant adhesion means of the upsetting apparatus (1C) of the third embodiment.

[0317] Next, an upsetting method using the upsetting apparatus (1D) of the fourth embodiment will be described below.

[0318] First, lubricate the peripheral surfaces of the through holes (34) (34) (44) of the guides (31) (32) (41) with the corresponding lubricant attaching means (91) (92). Adhere the agent. Furthermore, it is also possible to attach a lubricant to the surface of the right side (3R) and left side (3L) of the material (1).

Next, as shown in FIG. 14, the axially intermediate portion (2) of the material (1) is inserted and disposed in the material fixing fitting hole (21) of the fixing die (20).

[0320] Further, the right side portion (3R) of the material (1) is sequentially inserted into the insertion holes (34) (34) of the first right guide (31) and the second right guide (32). In this state, as shown in FIG. 15, there is an insertion hole in the gap (K) between the surface of the right side (3R) of the material (1) and the peripheral surface of each through hole (34) (34). (3 4) The lubricant adhering to the peripheral surface of (34) infiltrates due to capillary action or the like, and the lubricant is temporarily stored in the gap (K).

[0321] Further, the left side (3L) of the material (1) is inserted and arranged in the through hole (44) of the left guide (41). In this state, lubrication adhered to the peripheral surface of the through hole (44) in the gap between the surface of the left side (3L) of the same material (1) as above and the peripheral surface of the through hole (44) The agent is temporarily stored.

[0322] Further, by supplying a current of a predetermined frequency to the coil (81a) of the first induction heating means (81) by the power supply unit, the front end (31x) of the first right guide (31) is localized. Induction heating. As a result, the part (l lx) corresponding to the front end (31x) of the first right guide (31) in the right side (3R) of the material (1) is moved to the front end (31x) of the first right guide (31). Heats locally to a predetermined temperature with As a result, the deformation resistance at the portion (llx) of the material (1) is locally reduced.

[0323] The preferred range of the heating temperature of the part (l lx) of the material (1) is the same as the preferred range of the heating temperature described in the third embodiment.

[0324] Furthermore, by allowing a coolant such as room temperature coolant to flow through the coolant flow passageway (85a) of the first cooling means (85), the first right on the right side (3R) of the material (1) The part (lly) corresponding to the part behind the front end part (31 X) of the guide (31) is locally cooled. This makes the material (1 ) In the region (l ly) can be suppressed.

[0325] The preferred cooling temperature range in this case is the same as the preferred cooling temperature range described in the third embodiment.

[0326] On the other hand, no current is supplied to the coil (82a) of the second induction heating means (82).

[0327] Furthermore, by allowing a coolant such as room temperature coolant to flow in the coolant flow passageway (86a) of the second cooling means (86), the second right side (3R) of the material (1) A portion (12y) corresponding to a portion on the rear side of the front end portion (32X) of the guide (32) is locally cooled. Thereby, the fall of the deformation resistance in the said site | part (12y) of a raw material (1) can be suppressed.

[0328] Further, by supplying a current of a predetermined frequency to the coil (83a) of the third induction heating means (83) by the power supply unit (83b), the front end portion (41x) of the left guide (41) is locally localized. Induction heating. As a result, the part (13x) corresponding to the front end (41x) of the left guide (41) in the left side (3L) of the material (1) is heated to a predetermined temperature by the heat of the front end (41x) of the left guide (41). Heat locally. Thereby, the deformation resistance in the said part (13x) of a raw material (1) falls locally.

[0329] Furthermore, by allowing a coolant such as normal temperature coolant to flow through the coolant flow passageway (87a) of the third cooling means (87), the left guide (3L) on the left side (3L) of the material (1) ( The part (13y) corresponding to the part behind the front end part (41x) of 41) is locally cooled. Thereby, the fall of the deformation resistance in the said site | part (13y) of a raw material (1) can be suppressed.

[0330] Next, while maintaining such a state, the first exposed portion (4) and the third exposed portion (3) of the material (1) (with the same procedure as the upsetting method shown in the second embodiment) 6) are simultaneously expanded in the first molding recess (22) and the third molding recess (24).

[0331] As shown in FIG. 16, when the first exposed portion (4) of the material (1) is expanded in the design shape, that is, in a substantially cylindrical shape, in the first molding recess (22), 2Inductive heating of the front end (32x) of the second right guide (32) is locally induced by supplying a current of a predetermined frequency to the coil (82a) of the induction heating means (82) by the power supply (82b). . As a result, the portion (12x) corresponding to the front end (32x) of the second right guide (32) on the right side (3R) of the material (1) is moved to the front end ( Heat locally to a given temperature with 32x) heat. As a result, the part of the material (1) ( The deformation resistance in 12x) is locally reduced.

[0332] Further, by continuously circulating the coolant in the coolant flow path (86a) of the second cooling means (86), the second right guide (32) of the right side (3R) of the material (1) The part (12y) corresponding to the part behind the front end (32x) is locally cooled. Thereby, the fall of the deformation resistance in the said part (12y) of a raw material (1) can be suppressed.

[0333] Next, while maintaining this state, the second exposed portion (5) of the material (1) is obtained by the same procedure as the upsetting method shown in the second embodiment as shown in FIG. ) And the third exposed portion (6) are simultaneously expanded in the second molding recess (23) and the third molding recess (24), respectively.

[0334] With the above procedure, upsetting of the material (1) at three locations is completed.

[0335] Next, the material (1) is taken out from the insertion hole (21) of the fixed die (20) and the insertion hole (34) (34) (44) of each guide (31) (32) (41). The desired upsetting product (1

0B) is obtained.

Thus, the upsetting method of the fourth embodiment has the advantages of the upsetting method of the second embodiment and the advantages of the upsetting method of the third embodiment.

[0337] While several embodiments of the present invention have been described above, the present invention is not limited to those shown in the above-described embodiments, and various settings can be changed.

For example, in the present invention, the movement of the right punch (50R) is stopped when the second right guide (32) is moved after the first right guide (31) is moved. By moving only the second right guide (32), set the initial clearance between the second right guide (32) and the first right guide (31), and then move the right punch (50R). Even if you resume, good. By doing so, it is possible to reduce the diameter expansion processing load required to expand the diameter of the second exposed portion (5).

[0339] In the above embodiment, the number of right guides is two. However, in the present invention, the number of right guides may be three, or four or more.

[0340] In the above embodiment, the number of left guides is one. In the present invention, the number of left guides may be two or three or more. When there are a plurality of left guides, it is possible to increase the diameter of a plurality of portions on the left side of the material by performing the same operation as the right guide for the plurality of left guides. [0341] In the above embodiment, for convenience of explanation, one side and the other side in the axial direction of the material have been described as a "right side" and a "left side", respectively. It is not limited to this direction.

[0342] Further, in the present invention, the predetermined part of the material may be expanded in a state where the material is heated to a predetermined temperature, or the predetermined part of the material may be expanded in a state where the material is not heated. . That is, the upsetting method according to the present invention may be a hot upsetting method or a cold upsetting method.

Example

[0343] Next, specific examples of the present invention will be described below. However, the present invention is not limited to that shown in this example.

[0344] A round bar-shaped material (1) made of continuous forged rolled material with a diameter of 12 mm and a round bar-shaped material (1) also made of extruded material with a diameter of 12 mm were prepared by the Properchi method. The material of each material (1) is an aluminum alloy of alloy number A6061 in accordance with JIS (Japanese Industrial Standard). These materials (1) were upset using the upsetting apparatus (10C) of the third embodiment. And the average shaping | molding pressure required in that case was investigated. The results are shown in Table 1.

[0345] [Table 1]

[0346] Here, in the "heating mode" column in Table 1, "local heating" means the front end (31x) (32x) of each guide (31) (32) (41) in the material (1). This is a case where the part (l lx) (I2x) (13x) corresponding to (41x) is locally heated by induction heating means (81) (82) (83). “Whole heating” means that the entire material (1) is heated by a heating furnace, and then the heated material (1) is quickly heated. This is a case where upsetting is performed by setting in the upsetting machine (1C).

[0347] In the "Cooling" column, "Present" means the front end of each guide (31) (32) (41) in the material (1) by each cooling means (85) (86) (87). This is a case where the parts (lly) (12y) (13y) corresponding to the rear part of (31x) (32x) (41x) are locally cooled. “None” means no cooling.

[0348] As shown in Table 1, when the material (1) made of continuously forged rolled material was used (Example 1 and

In 2), the molding pressure could be reduced compared to the case of using the extruded material (Examples 3 and 4).

[0349] In addition, when local heating was performed (Examples 1 and 3), the entire heating was performed (Examples 1 and 3).

Compared with 2 and 4), the molding pressure was reduced.

[0350] This application is filed with Japanese Patent Application No. 2005-2417 8 filed on January 31, 2005, and US Provisional Application 60 / 649,547 filed on February 4, 2005. It is accompanied by a priority claim, and the disclosure content thereof constitutes a part of the present application as it is.

[0351] The terms and expressions used herein are for explanatory purposes only and are not used for limited interpretation. It should be recognized that various modifications within the claimed scope of the present invention are allowed without departing from such equivalents.

Industrial applicability

[0352] The present invention is applicable to an upsetting method and an upsetting apparatus for expanding the diameter of two or more portions of a rod-shaped material.

Claims

The scope of the claims

[1] Prepare a plurality of guides with through-holes penetrating in the axial direction to insert and hold the rod-shaped material in a buckling-prevented state,

[2] When expanding the first exposed part of the material in an unconstrained state,

The average movement speed from the start of punch movement is P,

The average movement speed from the start of movement of the first guide is G,

0

),

0

The upsetting time from the start of punch movement is τ,

And then,

In the case of t and T, G is

0

0≤G≤P (X -X) / (l -X -Pt)

1 0 1 0

The upsetting method according to claim 1, wherein the relational expression is satisfied.

[3] When the diameter of the first exposed portion of the material is expanded in the molding recess provided in the fixed die, the average moving speed from the start of punch movement is P, The average movement speed from the start of movement of the first guide is G,

0

X (where o≤x≤ x 0), the initial clearance between the front end of the first guide and the bottom of the molding recess,

0

P

0 0

),

And G is

G = P (X -X) / (L -X -Pt)

g 0 P 0

The upsetting method according to claim 1, wherein the following formula is satisfied.

[4] The upsetting method according to claim 1, wherein at least a first guide among the plurality of guides can be divided into a plurality of parts by a dividing surface that vertically cuts the insertion hole.

[5] The upsetting method according to claim 1, wherein the material is a round bar-shaped rolled material.

6. The upsetting method according to claim 5, wherein the rolled material is a forged rolled material.

7. The upsetting method according to claim 5, wherein the rolled material is a continuous forged rolled material.

[8] The diameter of the first exposed portion and the second exposed portion of the material may be increased in a state where the lubricant is adhered to the peripheral surface of each through hole of the plurality of guides and / or the surface of the material. The upsetting method described in 5.

[9] The upsetting method according to claim 1, wherein the first exposed portion of the material is expanded in a state in which a portion of the material corresponding to the front end portion of the first guide is locally heated.

[10] The upsetting method according to claim 9, wherein a portion of the material corresponding to the front end portion of the first guide is locally induction-heated by induction heating means.

[11] The method according to claim 9, wherein a portion of the material corresponding to the front end portion of the first guide is locally heated by induction heating the front end portion of the first guide locally by induction heating means. Upsetting method.

12. The upsetting method according to claim 9, wherein a portion of the material corresponding to the front end portion of the first guide is locally heated to a semi-molten state.

[13] The diameter of the first exposed portion of the material according to claim 9, wherein the first exposed portion of the material is expanded in a state where the portion corresponding to the portion rearward of the front end portion of the first guide in the material is locally cooled by the cooling means. Upsetting processing method.

[14] The upsetting method according to claim 1, wherein the diameter of the second exposed portion of the material is expanded in a state where the portion of the material corresponding to the front end portion of the second guide is locally heated.

15. The upsetting method according to claim 14, wherein a portion of the material corresponding to the front end portion of the second guide is locally induction-heated by induction heating means.

[16] The upsetting process according to claim 14, wherein a part of the material corresponding to the front end of the second guide is heated locally by induction heating of the front end of the second guide by induction heating means. Method.

17. The upsetting method according to claim 14, wherein a portion of the material corresponding to the front end portion of the second guide is locally heated to a semi-molten state.

[18] The diameter of the second exposed portion of the material may be increased in a state where the portion of the material corresponding to the portion behind the front end portion of the second guide is locally cooled by the cooling means. Upsetting method.

[19] An upsetting product obtained by the upsetting method according to claim 1.

[20] A plurality of axially penetrating through holes that pass through and hold one side of the rod-shaped material in both axial directions in a buckling-prevented state, and are arranged side by side in the axial direction A guide for one side of the

Prepare

One side of the material fixed to the fixed die at the intermediate portion in the axial direction of the material is the one side of the plurality In addition to passing through and holding in each through hole of the guide for the part sequentially, the other side of the material is passed through and held in the through hole of the guide for the other side,

When expanding the diameter of the first exposed part of the material in an unconstrained state,

The average movement speed from the start of movement of the first guide is G,

0

The time lag from the start of the movement of the one side punch to the start of the movement of the first guide is t (伹

0 and o≤t),

0

The upsetting time from the start of one side punch movement is τ,

And then,

For t <G, G is

0

0≤G≤P (X -X) / (l -X -Pt)

1 0 1 0

21. The upsetting method according to claim 20, wherein the following relational expression is satisfied. [22] When the diameter of the first exposed portion of the material is expanded in the molding recess provided in the fixed die, the average moving speed from the start of the movement of the one side punch is P,

The average movement speed from the start of movement of the first guide is G,

0

P

g The time lag from the start of movement of the one side punch to the start of movement of the first guide is t (however,

0 and o≤t),

0

And G is

G = P (X -X) / (L -X -Pt)

g 0 P 0

21. The upsetting method according to claim 20, wherein the following formula is satisfied.

23. The upsetting method according to claim 20, wherein at least the first guide among the plurality of one-side guides can be divided into a plurality of parts by a dividing surface that vertically cuts the insertion hole.

24. The upsetting method according to claim 20, wherein the material is a round bar-shaped rolled material.

[25] The upsetting method according to claim 24, wherein the rolled material is a forged rolled material,

26. The upsetting method according to claim 24, wherein the rolled material is a continuous forged rolled material.

[27] A state in which a lubricant is adhered to at least one of the peripheral surface of each through hole of the plurality of one-side guides, the peripheral surface of the through-hole of the other side guide, and the surface of the material. 25. The upsetting method according to claim 24, wherein the first exposed portion, the second exposed portion, and the third exposed portion of the material are expanded in diameter.

[28] The upsetting method according to claim 20, wherein the diameter of the first exposed portion of the material is expanded in a state where the portion of the material corresponding to the front end portion of the first guide is locally heated.

[29] The upsetting method according to claim 28, wherein a portion of the material corresponding to the front end portion of the first guide is locally induction-heated by induction heating means. 30. The upsetting method according to claim 28, wherein a portion of the material corresponding to the front end portion of the first guide is locally heated by induction heating the front end portion of the first guide locally by induction heating means.

29. The upsetting method according to claim 28, wherein a portion of the material corresponding to the front end portion of the first guide is locally heated to a semi-molten state.

The upsetting according to claim 28, wherein the first exposed portion of the material is expanded in diameter in a state where the portion corresponding to the portion of the material behind the front end portion of the first guide is locally cooled by the cooling means. Processing method.

21. The upsetting method according to claim 20, wherein the diameter of the second exposed portion of the material is expanded in a state where the portion corresponding to the front end portion of the second guide in the material is locally heated.

34. The upsetting method according to claim 33, wherein a portion of the material corresponding to the front end portion of the second guide is locally induction-heated by induction heating means.

34. The upsetting method according to claim 33, wherein a part of the material corresponding to the front end of the second guide is heated locally by induction heating of the front end of the second guide by induction heating means.

34. The upsetting method according to claim 33, wherein a portion of the material corresponding to the front end portion of the second guide is locally heated to a semi-molten state.

The upsetting according to claim 33, wherein the diameter of the second exposed portion of the material is expanded in a state where the portion corresponding to the portion of the material behind the front end of the second guide is locally cooled by the cooling means. Processing method.

21. The upsetting method according to claim 20, wherein the diameter of the third exposed portion of the material is expanded in a state in which a portion corresponding to the front end portion of the third guide in the material is locally heated.

39. The upsetting method according to claim 38, wherein a portion of the material corresponding to the front end portion of the third guide is locally induction-heated by induction heating means.

39. The upsetting method according to claim 38, wherein a portion of the material corresponding to the front end portion of the third guide is locally heated by induction heating the front end portion of the third guide by induction heating means.

The part of the material corresponding to the front end of the third guide is locally heated to a semi-molten state. 39. The upsetting method according to claim 38.

[42] The diameter of the third exposed portion of the material according to claim 38, wherein the third exposed portion of the material is expanded in a state where the portion corresponding to the portion of the material behind the front end portion of the third guide is locally cooled by the cooling means. Upsetting method.

[43] An upsetting product obtained by the upsetting method according to claim 20.

[44] a plurality of guides having axially penetrating through holes that pass through and hold the rod-shaped material in a buckling-prevented state, and arranged side by side in the axial direction;

A punch that presses the material in the axial direction;

An upsetting apparatus characterized by comprising:

45. The upsetting apparatus according to claim 44, wherein at least the frontmost guide among the plurality of guides can be divided into a plurality of parts by a dividing surface that vertically cuts the insertion hole.

[46] The material is a round bar-shaped rolled material,

45. The upsetting apparatus according to claim 44, further comprising lubricant attaching means for attaching a lubricant to a peripheral surface of each insertion hole of the plurality of guides and / or a material surface.

[47] The upsetting apparatus according to claim 46, wherein the rolled material is a forged rolled material.

48. The upsetting apparatus according to claim 46, wherein the rolled material is a continuous forged rolled material.

49. The upsetting apparatus according to claim 44, further comprising heating means for locally heating a portion corresponding to a front end portion of at least one guide among the plurality of guides in the material.

[50] The heating means is an induction heating means having an induction heating coil,

50. The upsetting apparatus according to claim 49, wherein a portion of the material corresponding to the front end portion of the at least one guide is locally heated by induction heating means.

[51] The heating means is an induction heating means having an induction heating coil,

Inductively heating the front end of the at least one guide locally by induction heating means 50. The upsetting apparatus according to claim 49, wherein the upsetting apparatus is configured to locally heat a portion of the material corresponding to the front end portion of the at least one guide.

52. The upsetting apparatus according to claim 49, wherein the heating means is capable of locally heating a portion of the material corresponding to the front end of the at least one guide to a semi-molten state.

53. The upsetting apparatus according to claim 49, further comprising cooling means for locally cooling a portion of the material corresponding to a portion on the rear side of the front end portion of the at least one guide.

[54] A plurality of axially penetrating insertion holes that pass through and hold one side of the rod-shaped material in both axial directions in a buckling-prevented state, and are arranged side by side in the axial direction. A guide for one side,

At least one other side guide having an axially penetrating hole for inserting and holding the other side of the material in a buckling-prevented state;

An upsetting apparatus characterized by comprising:

[55] The upsetting according to claim 54, wherein at least the frontmost guide of the plurality of one-side guides can be divided into a plurality of parts by a dividing surface that vertically cuts the through hole. Processing equipment.

[56] The material is a round bar-shaped rolled material,

Lubricant adhering means for adhering lubricant to at least one of the peripheral surface of each through hole of the plurality of one side guides, the peripheral surface of the through hole of the other side guide, and the surface of the material. 55. The upsetting apparatus according to claim 54.

57. The upsetting apparatus according to claim 56, wherein the rolled material is a forged rolled material.

58. The upsetting apparatus according to claim 56, wherein the rolled material is a continuous forged rolled material.

[59] At least one of the plurality of one-side guides and the other-side guides in the material. 55. The upsetting apparatus according to claim 54, further comprising heating means for locally heating a portion corresponding to the front end portion of each guide.

[60] The heating means is an induction heating means having an induction heating coil,

60. The upsetting apparatus according to claim 59, wherein a portion of the material corresponding to the front end of the at least one guide is locally heated by induction heating means.

[61] The heating means is an induction heating means having an induction heating coil,

The front end portion of the at least one guide is locally induction-heated by induction heating means, so that a portion of the material corresponding to the front end portion of the at least one guide is locally heated. 59. Upsetting machine according to 59.

62. The upsetting apparatus according to claim 59, wherein the heating means is capable of locally heating a portion of the material corresponding to the front end portion of the at least one guide to a semi-molten state.

63. The upsetting apparatus according to claim 59, further comprising cooling means for locally cooling a portion of the material corresponding to a portion on the rear side of the front end portion of the at least one guide.