JP6903473B2 - Forged material - Google Patents

Description

The present invention relates to an aluminum forging material used when molding a forged product by mold forging and related techniques thereof.

In the present specification and claims, the term aluminum (Al) is used to mean including an aluminum alloy (Al alloy).

In recent years, forged products made of aluminum have been used in a wide range of applications for various purposes, and there are many types of shapes depending on the application, and the required strength, durability, heat resistance, and other properties are also diverse. .. For this reason, the shape of the forged product becomes complicated, and the forming load at the time of forging tends to increase. Therefore, as a forging device, there is an increasing demand for a large press device and a servo press device capable of performing high-load multi-stage forming.

On the other hand, as the shape of the forged product becomes more complicated, that is, the shape of the mold becomes more complicated, there is a concern that forging defects may occur, and as the molding load increases, the life of the mold may be shortened.

JP-A-2007-118040 Japanese Unexamined Patent Publication No. 2014-213365

In the conventional technical field of forging, it is inevitable that the shape of the forged product becomes complicated, but by further improving the forging workability, it is possible to suppress the occurrence of forging defects and the increase in forming load. it can. In order to improve the forging workability, the amount of lubricating oil supplied to the die and forging material is important. For example, if the amount of lubricating oil applied is uneven and partially insufficient, the metal material (aluminum) as the forging material will adhere to the mold during forging, and the forged product will seize, resulting in poor forging (seizure). There was a problem that (defect) occurred. On the other hand, when the amount of lubricating oil applied is large in order to sufficiently distribute the lubricating oil in the mold, excess lubricating oil solidifies and remains in the mold, and the remaining lubricating oil is used as an impurity in the forged product. There is a problem that forging defects (impulsion defects) such as a decrease in strength occur.

The present invention has been made in view of the above problems, and the lubricating oil can be applied to an appropriate state at the time of mold forging, which causes forging defects such as seizure defects and driving defects and increases the molding load. It is an object of the present invention to provide forged materials and related technologies that can be prevented.

In order to solve the above problems, the present invention provides the following means.

[1] An aluminum forging material for forming a forged product by mold forging.
It has a substantially columnar appearance shape and has a substantially columnar appearance.
A forged material characterized in that an oil reservoir having an inwardly recessed shape is formed on the outer peripheral surface so as to continuously extend along the axial direction.

[2] The forged material according to item 1 above, wherein the oil sump is formed of a flat surface orthogonal to a radial axis.

[3] The forged material according to item 1 or 2 above, wherein a plurality of oil pools are formed at intervals in the circumferential direction.

[4] The forged material according to any one of items 1 to 3 above, wherein the oil sump is arranged at a position symmetrical with respect to the axis of symmetry.

[5] The forging material according to any one of the above items 1 to 4, wherein the amount of dent in the oil pool portion in the radial direction is set to 0.1% to 15% with respect to the diameter of the forging material.

[6] The width of the oil sump, which is the linear length from one end to the other end in the circumferential direction of the oil sump, is set to 1% to 30% with respect to the diameter of the forged material. The forged material according to any one of 5.

[7] A round bar material for forging material having a substantially circular cross section capable of producing an aluminum forging material used for mold forging by cutting along a plane orthogonal to the axis.
A forged material characterized in that a pressing mark for forming an oil pool portion is formed by pressing a region continuously extending in the axial direction on the outer peripheral surface of the round bar material toward the axial center side. Round bar material for.

[8] A method for manufacturing a forging material for manufacturing an aluminum forging material used for mold forging.
The process of obtaining a round bar with a substantially circular cross section,
A step of forming a pressing mark by inwardly pressing a region continuously extending in the axial direction on the outer peripheral surface of the round bar material.
Manufacture of a forged material comprising a step of obtaining a forged material having the pressed mark as an oil sump portion by cutting the round bar material with the pressing mark along a plane orthogonal to the axis. Method.

[9] The method for producing a forged material according to item 8 above, wherein the pressing roller is rolled into contact with the outer peripheral surface of the round bar material to form the pressing mark.

[10] An apparatus for manufacturing a forging material for manufacturing an aluminum forging material used for mold forging.
A pressing mark forming means for forming a pressing mark by inwardly pressing a region continuously extending in the axial direction on the outer peripheral surface of a round bar having a substantially circular cross section.
Forging is provided with a cutting means for obtaining a forging material having the pressure marks as an oil pool by cutting the round bar material on which the pressure marks are formed along a plane orthogonal to the axis. Material manufacturing equipment.

[11] The forging material manufacturing apparatus according to item 10, wherein the pressing mark forming means includes a pressing roller that rolls and contacts the outer peripheral surface of the round bar member to form the pressing mark.

[12] The pressing mark forming device is composed of a peeling device.
The peeling device is provided on a cutting machine having a cutting blade for cutting the outer peripheral surface of a round bar material conveyed along the axial direction, and on the upstream side and the downstream side of the cutting machine main body, respectively, and the round bar. It is provided with an upstream support roller and a downstream support roller that roll and contact the outer peripheral surface of the material to support the round bar material before and after cutting, respectively.
The forging material manufacturing apparatus according to item 11, wherein the pressing roller is configured by the downstream support roller.

According to the forging material of the invention [1], since the oil pool portion is formed on the outer peripheral surface, the lubricating oil can be applied in an appropriate state during the forging process, and the lubricating oil can be applied evenly and evenly in the mold. Can be done. Therefore, it is possible to prevent seizure due to a partial shortage of the lubricating oil, and it is also possible to prevent a driving failure due to the excess lubricating oil being driven into the forged product as an impurity. Further, since the lubricating oil can be applied in an appropriate state, the plastic working can be performed efficiently and smoothly, and the forging load can be reduced.

According to the forging material of the invention [2], since the oil pool portion is formed on a flat surface, plastic working can be performed more efficiently and smoothly, and the forging load can be further reduced.

According to the forged materials of the inventions [3] to [6], the above effects can be obtained even more reliably.

According to the round bar material for forging material of the invention [7], a forging material having the above effect can be surely obtained.

According to the method for producing a forged material according to the inventions [8] and [9], a forged material exhibiting the above effects can be reliably produced.

According to the forging material manufacturing apparatus according to the inventions [10] to [12], the forging material exhibiting the above effects can be reliably manufactured.

FIG. 1 is a plan view showing a forged material according to an embodiment of the present invention. FIG. 2 is a perspective view showing the forged material of the embodiment. FIG. 3 is an enlarged plan view showing a portion surrounded by the alternate long and short dash line in FIG. FIG. 4 is a perspective view showing a peeling device that functions as a manufacturing device for the forged material of the embodiment. FIG. 5 is a block diagram showing a forging device capable of using the forging material of the embodiment. 6A and 6B are schematic views for explaining a state during molding from immediately after the start of forging to immediately after the end of forging in the forging material of the embodiment, FIG. 6A is a schematic view of the state before the start of molding, and FIG. 6B is a schematic view of the state before the start of molding. A schematic diagram of the state immediately after, FIG. 3C is a schematic diagram of the state immediately before the completion of molding, and FIG. 3D is a schematic diagram of the state at the time of completion of molding.

1 to 3 are views showing a forged material according to an embodiment of the present invention. As shown in these figures, the forging material 1 of the present embodiment is used when forging is performed by mold forging to form a forged product. The forged material 1 is made of aluminum and has a substantially columnar appearance shape.

On the outer peripheral surface of the forged material 1, six flat oil pools 11 are formed at predetermined intervals along the circumferential direction. Each oil sump portion 11 is arranged so as to extend continuously over the entire area in the axial direction. In FIG. 2, in order to facilitate the understanding of the invention, the region of the forged material 1 in which the oil sump portion 11 is formed is hatched.

Here, in the present embodiment, the virtual circumferential surface in which the oil pool portion 11 on the outer peripheral surface of the forged material 1 is arranged along the unformed region is defined as the reference circumferential surface S. Further, in the present embodiment, the diameter (2r) of the forged material 1 corresponds to the radial dimension of the portion where the oil sump portion 11 is not formed, which corresponds to the diameter of the reference circumferential surface S. Is.

In the present embodiment, each oil pool portion 11 is formed on a flat surface in a form in which the oil pool portion 11 is recessed inward (on the axial center side) from the reference circumferential surface S and is pressed and deformed. Each flat surface constituting each oil sump portion 11 is arranged so as to be orthogonal to a radial axis orthogonal to the axis X.

Further, in the present embodiment, the six oil sump portions 11 are arranged at positions symmetrical with respect to the axis X as the axis of symmetry. In other words, in the plan view state shown in FIG. 1, the six oil sump portions 11 are arranged at point-symmetrical positions with the axis X as the point of symmetry.

Here, as shown in FIGS. 1 and 3, in the forged material 1 of the present embodiment, from one end (one side edge) to the other end (other side edge) of the oil sump portion 11 in the circumferential direction in a plan view. The linear distance (oil pool width) W to is preferably set to 1% to 30%, more preferably 3% to 20% with respect to the diameter (2r) of the forging material 1. .. Further, the number of oil pools 11 (number of oil pools) formed in the forging material 1 is preferably set to 1 to 9, and more preferably 3 to 6. That is, when the width W of the oil pool and the number of oil pools are included in the above-mentioned specific range, the lubricating oil is applied to an appropriate state when the mold is forged using the forging material 1 as described later. It is possible to suppress the occurrence of forging defects and the increase in molding load. In other words, if the width W of the oil sump or the number of oil sumps deviates from the above specific range, it becomes difficult to apply the lubricating oil to an appropriate state when the mold is forged, and a forging defect occurs. And there is a high possibility that the molding load will increase.

Further, as shown in FIGS. 1 and 3, in the forged material 1 of the present embodiment, the depth of the oil pool portion 11 as the amount of dent along the radial direction from the reference circumferential surface S in the oil pool portion 11 in a plan view. It is preferable to set the D (deepest part) to 0.1% to 15% with respect to the diameter (2r) of the reference circumferential surface (forged material 1). That is, when the oil sump depth D is included in the above-mentioned specific range, the lubricating oil can be applied to an appropriate state when the mold forging is performed using the forging material 1 as described later. It is possible to suppress the occurrence of forging defects and the increase in molding load. In other words, if the depth D of the oil sump deviates from the above-mentioned specific range, it becomes difficult to apply the lubricating oil to an appropriate state when performing die forging, resulting in forging defects and forming load. May cause an increase in.

To give a specific example, in the forged material 1 having a diameter of φ74 mm, six oil sump portions 11 are formed at equal intervals in the circumferential direction, the oil sump portion width W is 1 mm to 8 mm, and the oil sump depth D. Is preferably set to 0.01 mm to 0.3 mm.

Next, a method of manufacturing the forged material 1 in the present embodiment will be described. The forged material 1 of the present embodiment is obtained by peeling an aluminum round bar having a circular cross section obtained by continuous casting or the like and then cutting it, and the surface is cut during the peeling process. , As described below, a pressing mark corresponding to the oil pool portion 11 is formed on the outer peripheral surface.

FIG. 4 is a perspective view schematically showing a peeling device as a manufacturing device for the forged material 1 according to the embodiment of the present invention. As shown in the figure, this peeling device includes an upstream roller support machine 2, a downstream roller support machine 3, and a cutting machine 4.

The cutting machine 4 is provided with a plurality of cutting blades 41 at equal intervals in the circumferential direction along the outer peripheral surface of the aluminum round bar member 1a as a work to be conveyed on the transfer line. By transporting the round bar material along the transport line while rotating the cutting blade 41, the outer peripheral surface of the round bar member 1a is cut off by the cutting blade 41.

The upstream roller support machine 2 and the downstream roller support machine 3 are provided with six upstream support rollers 21 and downstream support rollers 31 at equal intervals in the circumferential direction along the outer peripheral surface of the round bar member 1a, respectively. ing. Each of the support rollers 21 and 31 of both roller support machines 2 and 3 is configured to roll and contact the outer peripheral surface of the round bar member 1a transported along the transfer line. Each of the support rollers 21 and 31 also serves as a guide roller, and the round bar member 1a is conveyed on the transfer line in a state of being supported with high positional accuracy by these support rollers 21 and 31. ..

In the peeling device of the present embodiment, the round bar member 1a whose surface has been cut by the cutting machine 4 is carried out while being supported by the downstream support roller 21, but is rounded by the downstream support roller 21 at the time of carrying out. The outer peripheral surface of the bar 1a is pushed in with an appropriate pressure, whereby a pressing mark (roller mark) 11a is formed on the outer peripheral surface of the round bar 1a. The pressing marks 11a correspond to the oil sump portion 11, and are formed on the outer peripheral surface of the round bar member 1a continuously in the axial direction and six at equal intervals in the circumferential direction. In FIG. 4, in order to facilitate the understanding of the invention, the region of the round bar member 1a where the pressing marks 11a are formed is hatched.

Here, in the present embodiment, the downstream support roller 21 functions as a pressing mark forming device for pressing the required region on the outer peripheral surface of the round bar member 1a toward the axial center side to form the pressing mark 11a. is there.

Further, in the present embodiment, in the round bar material (cut round bar material) 1a whose surface is cut by the cutting machine 4, the state before being pressed by the downstream support roller 21, that is, the pressing mark 11a is not formed. The outer peripheral cross section of the cut round bar member 1a is formed in a substantially perfect circular shape, and the outer peripheral surface corresponds to the reference circumferential surface S.

Subsequently, the round bar member 1a on which the pressing mark 11a is formed is cut along a plane orthogonal to the axis by a cutting device (not shown), so that the pressing mark 11a is a substantially columnar columnar portion 11 as an oil sump portion 11. The forged material 1 is manufactured.

Here, in the present embodiment, the forging material manufacturing apparatus is configured by the peeling apparatus and the cutting apparatus. Further, the downstream support roller 31 of the peeling device constitutes the pressing mark forming means, and the cutting device constitutes the cutting means.

Next, a case where a forged product is formed by performing mold forging on the forged material 1 of the present embodiment will be described.

FIG. 5 is a front sectional view schematically showing a forging apparatus capable of performing mold forging using the forging material 1 of the embodiment. As shown in the figure, this forging device includes a die 5 and a punch 6.

The die 5 is attached to a substantially cylindrical (substantially ring-shaped) ring block 51 having a through hole penetrating up and down along the axial direction with respect to the ring block 51 in the through hole of the ring block 51. It is equipped with a bottom block 55. In the present embodiment, the molding recess (cavity) 50 is formed by the inner peripheral surface of the through hole of the ring block 51 and the upper surface (bottom surface) of the bottom block 55 in the descending state. Further, the bottom block 55 also serves as a knock member, and the molded product (forged product) can be projected above the die 5 by rising with respect to the ring block 51 after molding.

The punch 6 is supported by the punch holder 61, and the horizontal cross-sectional shape is formed in a circular shape corresponding to the horizontal cross-sectional shape of the molding recess 50 of the die 5. Further, the punch 6 can be driven up and down with the axis aligned with the molding recess 50 of the die 5, and can be driven into the molding recess 50 of the die 5 with a predetermined load. ..

In order to form a forged product by forging the forging material 1 of the present embodiment using the forging device having the above configuration, the forging material 1 is put into the molding recess 50 of the die 5 of the forging device. Lubricating oil is applied to the inner peripheral surface of the molding recess 50 of the die 5, the outer peripheral surface of the punch 6, and the outer peripheral surface of the forging material 1.

In this state, the punch 6 is driven into the molding recess 50 of the die 5 to pressurize the forging material 1 with a predetermined load, and mold forging is performed so that the forging material 1 is plastically deformed and filled into the molding recess 50. , Mold the forged product.

In this forging process, as shown in FIG. 6A, in the state immediately before the punch 6 is driven into the forging material 1 (the state before the start of molding), the lubricating oil 7 is attached to the outer peripheral surface of the forging material 1. In particular, sufficient lubricating oil 7 is held in the oil sump portion 11. Further, although the lubricating oil 7 is also adhered to the inner peripheral surface of the molding recess 50 of the die (mold) 5, it is not evenly and evenly adhered to the entire inner peripheral surface of the molding recess 50, and is slightly biased. Attached to the state.

Next, as shown in FIG. 6B, in the state immediately after the punch 6 is driven into the forging material 1 and the molding is started, the forging material 1 starts plastic deformation, the oil sump portion 11 is deformed, and the oil pool portion 11 is deformed. The lubricating oil 7 held in the oil sump portion 11 is also deformed so as to approach the inner peripheral surface of the die 5.

Subsequently, as shown in FIG. 6C, in the state immediately before the molding is completed, the outer circumference of the forging material 1 approaches the inner peripheral surface of the die 5, and the lubricating oil 7 of the oil sump portion 11 is inside the die 5. It comes into contact with the peripheral surface and spreads evenly in the circumferential direction along the inner peripheral surface.

Then, as shown in FIG. 6D, in the state when the molding is completed, the lubricating oil 7 is completely between the inner peripheral surface of the die 5 and the outer peripheral surface of the plastically deformed forging material 1 (forged product 1b). It will be distributed evenly and evenly around the lap.

After the molding is completed and the forged product 1b is formed, the punch 6 is raised and then the bottom block 55 of the die 5 is raised with respect to the ring block 51, so that the forged product 1b is projected from the die 5. Is discharged.

As described above, in the present embodiment, since the oil sump portion 11 is formed on the outer peripheral surface of the forging material 1, the entire area between the forging material 1 and the die (die 5) is evenly and evenly formed during the forging process. The lubricating oil 7 can be applied, and it is possible to prevent a problem that the lubricating oil 7 is partially insufficient. Therefore, seizure due to insufficient lubricating oil 7 can be prevented, and forging defects can be prevented from occurring.

Further, since the lubricating oil 7 can be applied evenly and evenly over the entire inner peripheral surface of the mold, it is not necessary to supply a large amount of the lubricating oil 7 in order to sufficiently distribute the lubricating oil 7. That is, the amount of the lubricating oil 7 applied can be reduced, and it is possible to prevent a problem that excess lubricating oil 7 remains in the mold. Therefore, it is possible to prevent a driving defect in which the excess lubricating oil solidifies and remains in the mold, and the remaining solid lubricating oil 7 is driven into the forged product 1b as an impurity. Therefore, it is possible to prevent the occurrence of forging defects such as a decrease in strength of the forged product 1b due to improper driving (mixture of impurities).

Further, in the present embodiment, since the flat oil pool portion 11 is formed on the outer peripheral surface of the forged material 1, the surface area of the forged material 1 can be reduced. Therefore, the plastic working of the forging material 1 can be efficiently and smoothly performed, and the forming load can be reduced. Therefore, die forging with a low load can be realized, the forging device can be made smaller and more compact, the load on the die can be reduced during the forging process, the die life can be extended, and the production can be extended. Cost can be reduced.

Further, in the present embodiment, the lubricating oil 7 can be evenly adhered to the entire area in the mold by forming the oil sump portion 11, and therefore, in this respect as well, the plastic working can be performed efficiently and smoothly. The molding load can be further reduced. Therefore, the forging device can be made smaller and more compact, the die life can be extended, and the production cost can be reduced more reliably.

Further, in the present embodiment, the six oil sump portions 11 are formed on the outer peripheral surface of the forging material 1 at equal intervals in the circumferential direction, and the oil sump portions 11 are arranged at positions symmetrical with respect to the axis X as the axis of symmetry. Therefore, the lubricating oil 7 can be more evenly distributed in the die 5, problems such as excess and deficiency of the lubricating oil 7 can be prevented more reliably, and the forming load can be further reduced. ..

In the above embodiment, the pressing mark 11a corresponding to the oil sump portion 11 is formed during the peeling process, but the present invention is not limited to this, and in the present invention, the oil sump portion 11 is formed in a step other than the peeling process. It may be formed. For example, a dedicated process for forming the oil sump portion 11 may be separately provided.

Further, in the above embodiment, the case where the pressing mark 11a corresponding to the oil sump portion 11 is formed by the support roller 31 (including the guide roller) has been described as an example, but the present invention is not limited to this. An oil pool portion such as a pressing mark may be formed by a transport roller or the like that is driven to rotate by a driving force to transport a round bar material or the like. Further, in the present invention, the outer peripheral surface of the forged material, the round bar material, or the like may be pressed by a pressing means other than the roller to form an oil pool portion such as a pressing mark.

Further, in the above embodiment, the forged material having the oil sump portion is produced by cutting the round bar material on which the pressing mark 11a as the oil sump portion 11 is formed, but the forged material is not limited to that, and the oil sump portion is not limited to that. After cutting a round bar material in which a portion corresponding to a portion (pressing mark, etc.) is not formed to produce a forged material in which an oil pool portion is not formed, an oil pool portion is formed on the outer peripheral surface of the forged material. You may.

Further, in the above embodiment, the case where the oil sump portion 11 is formed by a flat surface has been described as an example, but the present invention is not limited to this, and in the present invention, the oil sump portion formed on the outer peripheral surface of the forging material is formed. , It may be formed in a convex shape having a radius larger than the radius of the reference circumferential surface, or in a concave shape recessed inward (axis center side) from the flat surface. In short, any shape can be used as an oil sump as long as it is recessed inward from the reference circumferential surface.

Further, in the above embodiment, a columnar material is used as the forging material 1, but the forging material is not limited to that. In the present invention, the forging material is an elliptical columnar material having an elliptical cross section or an elliptical columnar material having an elliptical cross section. Things can also be adopted.

Further, in the above embodiment, the case where six oil pools 11 are formed in the forged material 1 has been described as an example, but the present invention is not limited to this, and in the present invention, the forged material 1 has five oil pools 11. The following, or 7 or more may be formed.

<Example>
A round bar 1a made of an Al—Si alloy was manufactured using the same peeling device (see FIG. 4) as in the above embodiment. At this time, by adjusting the pressing force of the downstream support roller against the round bar member 1a, six pressing marks 11a are formed on the outer peripheral surface of the round bar member 1a at equal intervals in the circumferential direction in the length direction (axial direction). It was formed to be continuous along.

The round bar member 1a with the pressing marks 11a thus obtained is cut in a plane orthogonal to the axis to produce a forged material 1 in which the pressing marks 11a as shown in FIGS. 1 to 3 are used as the oil sump portion 11. did. The diameter φ (diameter of the reference circumferential surface S) of the forged material 1 is 74 mm, and the thickness (length in the axial direction) is 50 mm. Further, in the forged material 1, six oil sump portions 11 are arranged at equal intervals in the circumferential direction, and the width W of each oil sump portion W is 4 mm and the depth D is 0.4 mm.

<Comparison example>
A forged material was produced in the same manner as in the above embodiment, except that the pressing marks 11a (oil pool portion 11) were not formed.

<Evaluation of forging workability>

The forging materials of the above-described example and the comparative example are forged (installed) by a forging device similar to the above-described embodiment (see FIG. 5), respectively, to have a diameter of φ83 mm and a thickness (length in the axial direction). ) 100 39.6 mm columnar or disc-shaped forged products were produced. In this forging process, the temperature of the forged material was set to 400 ° C. ± 50 ° C. and the mold temperature was set to 200 ° C. ± 80 ° C. As the lubricating oil, oil-based lubricating oil was mainly used, and water-based lubricating oil was partially used. Furthermore, a rotary spray method was adopted as the method of applying the lubricating oil.

When the forging process was performed under these conditions, as shown in Table 1, in the forging process using the forging material of the example having the oil pool portion (roller mark), seizure failure due to a partial lack of lubricating oil occurred. It did not occur even once, and no driving failure due to residual excess lubricating oil occurred. Further, the forging load was also 200 tons.

On the other hand, in the forging process using the forging material of the comparative example in which there is no oil pool (roller mark), one out of 100 forged products has a seizure defect, and two forged products are driven. A defect has occurred. Further, the forging load was 205 tons, which was larger than that of the examples.

As is clear from the above evaluation results, when forging is performed using the forging material of the examples related to the present invention, it is possible to reliably prevent the occurrence of seizure defects and driving defects, and the forging load is also low. I was able to suppress it. Therefore, it can be seen that the degree and amount of the lubricating oil applied can be adjusted appropriately, and the lubricating oil can be applied in an appropriate state.

On the other hand, when forging is performed using a forging material of a comparative example that deviates from the gist of the present invention, seizure defects and driving defects may occur, and the forging load is also increased. Therefore, it can be seen that the degree and amount of the lubricating oil applied cannot be adjusted well, and it is difficult to apply the lubricating oil in an appropriate state.

The forged material of the present invention can be suitably used when a forged product is produced by mold forging.

1: Forging material 1a: Round bar 1b: Forged product 11: Oil pool 11a: Pressing mark 21: Upstream support roller 31: Downstream support roller 4: Cutting machine 41: Cutting blade D: Depth of oil pool W: Width of oil sump X: Axial center

Claims (11)

An aluminum forging material for molding forged products by mold forging.
It has a substantially columnar appearance shape and has a substantially columnar appearance.
An oil sump portion in the form of a recess inward is formed on the outer peripheral surface so as to extend continuously along the axial direction .
A forged material characterized in that a plurality of oil pools are formed at equal intervals in the circumferential direction. The forged material according to claim 1, wherein the oil sump is formed of a flat surface orthogonal to a radial axis. The forged material according to claim 1 or 2 , wherein the oil sump portion is arranged at a position symmetrical with respect to the axis of symmetry. The forged material according to any one of claims 1 to 3 , wherein the amount of dent in the oil pool portion in the radial direction is set to 0.1% to 15% with respect to the diameter of the forged material. Claims 1 to 4 in which the width of the oil sump, which is the linear length from one end to the other end in the circumferential direction of the oil sump, is set to 1% to 30% with respect to the diameter of the forged material. The forged material according to any one of the items. A round bar material for forging material having a substantially circular cross section, which can produce an aluminum forging material used for mold forging by cutting along a plane orthogonal to the axis.
By pressing the region of the outer peripheral surface of the round bar material that extends continuously in the axial direction toward the axial center, pressing marks for forming a plurality of oil pools at equal intervals in the circumferential direction are formed. A round bar material for forging materials, which is characterized by being made into. A method for manufacturing a forging material for manufacturing an aluminum forging material used for mold forging.
The process of obtaining a round bar with a substantially circular cross section,
A step of forming a pressing mark by inwardly pressing a region continuously extending in the axial direction on the outer peripheral surface of the round bar material.
By cutting the round bar material with the pressing marks along a plane orthogonal to the axis, the pressing marks are used as oil pools , and a plurality of the oil pools are formed at equal intervals in the circumferential direction. A method for manufacturing a forged material, which comprises a process of obtaining a forged material. The method for manufacturing a forged material according to claim 7 , wherein the pressing roller is rolled into contact with the outer peripheral surface of the round bar material to form the pressing mark. A forging material manufacturing device for manufacturing aluminum forging materials used for mold forging.
A pressing mark forming means for forming a pressing mark by inwardly pressing a region continuously extending in the axial direction on the outer peripheral surface of a round bar having a substantially circular cross section.
By cutting the round bar material on which the pressing marks are formed along a plane orthogonal to the axis, the pressing marks are used as oil pools , and the oil pools are formed at equal intervals in the circumferential direction. An apparatus for producing a forged material, which comprises a cutting means for obtaining the formed forged material. The forging material manufacturing apparatus according to claim 9 , wherein the pressing mark forming means includes a pressing roller that rolls and contacts the outer peripheral surface of the round bar member to form the pressing mark. The pressing mark forming means is composed of a peeling device.
The peeling device is provided on a cutting machine having a cutting blade for cutting the outer peripheral surface of a round bar material conveyed along the axial direction, and on the upstream side and the downstream side of the cutting machine main body, respectively, and the round bar. It is provided with an upstream support roller and a downstream support roller that roll and contact the outer peripheral surface of the material to support the round bar material before and after cutting, respectively.
The forging material manufacturing apparatus according to claim 10 , wherein the pressing roller is configured by the downstream support roller.

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