JPH05293586A - Tooth profile forming product and formation of tooth profile - Google Patents

Abstract

PURPOSE:To provide a tooth profile forming product excellent in strength and a tooth profile forming method. CONSTITUTION:A cuplike slug W having a bottom is loosely inserted into a first punch 30 forming a tooth profile 32 for forming on the outer peripheral surface and the first punch 30 and a faced die 20 matched with the tooth profile 32 in the punch side on the inner peripheral surface and forming the tooth profile 22 for forming are engaged in an axial direction by pressing the end surface in the opening hole side of a slug cylindrical part with a second punch 40 in the condition of pressing the bottom part of the slug to the tip surface of the punch by a slug holder 28. A raw material is plastically deformed in the axial direction and the material is fluidized and filled into the bottom part of the tooth profile in the first punch to form the tooth profile in the both sides at the inner and outer parts in the cylindrical part by the plastic working.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bottomed cup-shaped tooth-formed product in which teeth are formed on both inner and outer sides of a tubular portion, and a method for forming the tooth profile.

[0002]

2. Description of the Related Art In order to manufacture a cup-shaped gear in which a tooth profile is formed on the outer surface of a tubular portion, it has hitherto been carried out by cutting. However, in the cutting process, the process takes time, the material is wasted, and if the height (depth) of the tooth profile function part is increased, a thicker material is required, and the cutting amount is increased. There is a problem that the amount of waste increases and the amount of waste of materials also increases. Therefore, a method has been proposed in which a plate material is drawn into a cup shape, and tooth shapes are formed on both the inside and outside of the cylindrical portion of the cup-shaped slag. As a technique of this kind, for example, Japanese Examined Patent Publication No. 61-21736 is known, and as shown in FIG. 12, this includes a male mold 1 having a tooth profile 2 formed on the outer periphery and a tooth profile 4 formed on the inner periphery. This is a method of meshing the formed female mold 3 in the axial direction to draw the plate member 6 into a cup shape and at the same time form a tooth profile inside and outside the tubular portion.

As another method, there is also known a method of forming a tooth profile with a cam mold on both the inside and outside of the cylindrical portion of a cup-shaped slag formed by drawing in a cup shape.

[0004]

However, in the first method described above, the tooth profile can be easily formed only by engaging the male die 1 and the female die 3, but the tooth profile is formed by drawing. Therefore, the tensile stress causes the raw material to extend in the axial direction in which the mold is engaged and become thin, resulting in a problem that the molded product is insufficient in strength and its use is limited.

In the second method, there are problems that the fiber flow of the material is cut and that the outer tooth cannot be formed into a tooth profile up to the bottom of the cup. The present invention has been made in view of the above problems of the prior art, and an object of the present invention is to provide a tooth forming product and a tooth forming method which are excellent in strength.

[0006]

In order to achieve the above-mentioned object, in a tooth-formed shaped article according to the present invention, a cup-shaped slug with a bottom is loosely inserted, and a toothing for forming is formed on the outer peripheral surface.
No. 1 and the opposing die having a tooth profile for forming on the inner peripheral surface that matches the tooth profile on the punch side and has a smaller depth of ridges and valleys than the plate thickness of the slag. The second punch arranged on the outer periphery of the first punch presses the end surface of the slug cylindrical portion opening side while being pressed and held by the surface, so that the material is axially meshed and the material is plastically deformed in the axial direction. The material is flow-filled in the tooth profile of the punch,
The tooth profile is formed on both the inside and outside of the cylindrical portion by plastic deformation.

Further, in the tooth forming method according to the present invention, the bottomed cup-shaped slug is loosely inserted into the first punch having the forming tooth profile formed on the outer peripheral surface, and the first punch and the inner peripheral surface are provided with the above-mentioned. The opposing die, which is aligned with the tooth profile on the punch side and has the molding tooth profile, is pressed by the slug presser against the first punch tip surface with the slag retainer, and the slag cylindrical portion opening side end surface is controlled by the second punch. By pressing, the material meshes in the axial direction to plastically deform the material in the axial direction,
The tooth profile of the punch is filled with a material by fluidization to form tooth profiles on both the inside and outside of the cylindrical part by plastic working.

According to a third aspect of the present invention, in the method according to the second aspect, a tooth profile that meshes with a molding tooth profile on the opposite die side is formed at the tip of the second punch, and the tooth profile on the second punch side is formed. The tooth profile and the tooth profile on the opposite die side are meshed with each other, and the extra thickness portion raised above the cylindrical portion is cut during the tooth formation.

[0009]

[Operation] The material is plastically deformed in the axial direction by the tooth profile (forming portion) on the die side, but the end face on the opening side of the slag cylinder is pressed by the second punch, so that the material flow in the axial direction is blocked. The material flows into the tooth profile trough on the punch side to fill the trough, and a tooth profile (external tooth) that follows the die tooth profile is formed on the outside of the slag cylinder, and a tooth profile that follows the punch tooth profile (internal tooth) on the inside. ) Is molded.

In the third aspect, the tooth profile of the second punch meshes with the tooth profile of the die to separate the burr raised above the cylindrical portion from the molded product.

[0011]

Embodiments of the present invention will now be described with reference to the drawings. 1 (a) and 1 (b) are explanatory views for explaining a tooth profile being formed on both inner and outer sides of a cylindrical portion of a cup-shaped slag. In FIG. 1, (a) is a cup shape before the tooth profile is molded. FIG. 2B is a perspective view of the slug, FIG. 2B is a perspective view of the cup-shaped slug after tooth formation, and FIG. 2 is a horizontal sectional view of the cylindrical portion of the cup-shaped gear.

In these figures, reference numeral 10 in FIG.
Shows a cup-shaped gear, which is a tooth-formed product, and has a tooth profile 12 (inner teeth 12A, outer teeth 12) in which peaks and valleys are alternately formed continuously by plastic deformation on both inner and outer sides of the cylindrical portion 11.
B) is formed. The inner tooth 12A includes a mountain portion 13a and a valley portion 14a, and the outer tooth 12B includes a mountain portion 13b and a valley portion 14a.
b), and the inner teeth 12A and the outer teeth 12B are formed with peaks and valleys corresponding to each other. The cup-shaped slug before forming the tooth profile is shown by reference numeral W in FIG. 1A, and the cylindrical portion of the cup-shaped slug W is plastically deformed in the axial direction, as shown in FIG. 1B. The cup-shaped gear 10 is obtained.

3 and 4 are cross-sectional views of a mold apparatus used in the method of the present invention. FIG. 3 is a cross-sectional view of a molding apparatus while the punch is descending, and FIG. 4 is a punch descending to form a tooth profile. 5 is a perspective view of the second punch, FIGS. 6 and 7 are explanatory views showing how the slag tubular portion is plastically deformed to form a tooth profile, and FIGS. Is a cross-sectional view taken along the lines VIII-VIII and IX-IX shown in FIGS. 6 and 7, and FIG. 10 is an explanatory view for explaining how the material is plastically deformed.

In these drawings, reference numeral 20 is a ring-shaped die, and a tooth profile 22 for molding external teeth 12B is formed on the outer surface of the cup-shaped slug W on the inner periphery of the die 20. As shown in FIG. 9, the tooth profile 22 includes a mountain portion 23 and a valley portion 24 formed at a constant pitch in the circumferential direction and having a depth d smaller than the plate thickness t of the slag W. Also Yamabe 23
Is provided at a position separated by a predetermined depth h (see FIGS. 3 and 6) from the upper end surface of the die, and the slag introduction side of the ridge portion 23 is tapered and a material introduction portion 23a is formed therein. .. The lower end portion 23b of the material introducing portion 23a is a forming portion that plastically deforms the material press-fitted by the punch, and the tip end surface of the mountain portion 23 extends vertically from the forming portion 23b. The die 20 includes a die holder 26 (26a, 26b, 2
6c) is supported from below, and the bottom surface of the slug W is provided below the tooth profile 22 forming portion of the die 20 with the first punch 3a.
A slug presser 28 is arranged to press and hold the front end surface of No. 0 and knock out the slag W after tooth formation.

Above the die 20, there is formed a tooth profile 32 for sandwiching the bottom surface of the slag W in cooperation with the slag retainer 28 and for molding the internal teeth 12A on the inner side surface of the cup-shaped slug W. A cylindrical first punch 30 that is present and is arranged on the outer periphery of the first punch 30 and is vertically movable to press the end surface on the opening side of the slag cylinder to prevent the slug cylinder from extending in the axial direction. Second punch 40 is arranged.

Tooth profile 3 formed on the first punch 30
2 is a mountain portion 33 and a valley portion 3 as shown in FIGS.
4 corresponds to the tooth profile 22 on the die side. That is, a die-side valley portion 24 (ridge portion 23) is formed at the punch-side mountain portion 33 (valley portion 34) position, and the punch-side tooth profile 32 and the die-side tooth profile 22 are interposed via the slag cylindrical portion. It is designed to mesh with each other. Then, as the punch 30 descends, the cylindrical portion of the slag is plastically deformed in the axial direction to form the outer teeth 12B following the tooth profile 22 on the outer side of the cylindrical portion and follow the tooth profile 32 on the inner side of the cylindrical portion. The inner teeth 12A are molded.

Further, the second punch 40 presses the opening side end of the cylindrical portion of the slag, and the cylindrical portion of the slag has the introduction portion 2 on the die side.
3a prevents the movement of the material that is plastically deformed to extend in the axial direction, that is, the material of the cylindrical portion tries to flow in the axial direction, but the second punch 40 prevents the movement of the material in the axial direction. Therefore, the material is the valley 34 of the tooth profile 32 on the punch side.
Filled inside. The force for plastic deformation is mainly given by the second punch 40 that presses the end surface on the opening side of the slag cylindrical portion, but the first punch 30 that holds the bottom surface of the slag also has a part of the force for forming. Bears. Further, the second punch 40 is a cylindrical body whose tip is thinner than the base portion, and the outer peripheral surface of the punch tip portion corresponds to the crest portion 23 of the tooth profile 22 on the die side, as shown in FIG. The tooth profile 44 is formed at a constant pitch. That is, the recess 44 a of the tooth profile 44 corresponds to the position of the introduction portion 23 a formed at the upper end of the mountain portion 23 of the tooth profile 22, and the punches 30, 40 are formed.
Pushes the slag W into the die 20, and when the tip of the second punch 40 approaches the position of the lower end portion 23b of the introduction portion 23a as shown in FIG. 7, the introduction portion 23a is made of a plastically deformed material. Part of the recess 44 of the tooth profile 44 of the second punch
It is designed to be pushed into a. Hereinafter, this recess 44
A part of the material extruded into a is referred to as a surplus portion, and is indicated by a symbol w in FIG. Then, the second punch 40 further descends, the tooth profile 44 meshes with the tooth profile 22 on the die side, and the extra wall portion w raised above the cylindrical portion is separated from the molded product.

Next, the step of forming the tooth profile on the slag and the behavior of forming the tooth profile will be described with reference to FIGS. 3, 4 and 6 to 10. First, as shown in FIG. 3, while raising the slag retainer 28 to the vicinity of the open end of the die 20,
The slug W is inserted into the lower end of the punch 30. Next, the punch 30 and the punch 40 are integrally lowered while keeping the state where the slag W is pressed against the punch 30 by the slag retainer 28. The slag W has a tooth profile 22 as shown in FIG.
Of the tooth profile 22 and hits the introduction portion 23a of the tooth profile 22, and thereafter, the slag cylindrical portion is plastically deformed by the forming portion 23b. That is, the cylindrical portion of the slug slides along the tapered surface of the introduction portion 23a,
The material is about to be axially plastically deformed by the molding portion 23b, which is the final end of the material, and the material tends to flow in the axial direction as shown by the arrow in FIG. However, since the second punch 40 prevents the material from flowing in the axial direction, the material flows into and fills the valley portion 34 of the tooth profile 32 and is plastically deformed. As shown in FIG. The tooth profile 12B has a shape that follows the tooth profile 22 (the crests 23 and the valleys 24), and the tooth profile 1 that has a shape that follows the tooth profile 32 (the crests 33 and the valleys 34) is inside the cylindrical portion.
2A is molded respectively. The tooth profile 44 on the second punch 40 side meshes with the tooth profile 22 on the die side to separate the excess thickness portion w from the molded product. After the tooth profile is formed, the punches 30 and 40 are raised, and then the slag retainer 28 is raised to knock out the molded product fitted to the inner circumference of the die to obtain the product shown in FIG. 1 (b).

FIG. 11 shows another embodiment of the tooth-shaped shaped article according to the present invention. As shown in FIG. 1B, the cup-shaped gear 10 which is the tooth-formed product of the above-described embodiment is a spur gear in which both the outer teeth and the inner teeth are formed parallel to the shaft. In the cup-shaped gear 10A shown in the example,
The inner teeth 12C composed of the ridges 13c and the valleys 14c are formed into so-called hasbahs that are inclined with respect to the axis.

As the forming apparatus for manufacturing the cup-shaped gear shown in FIG. 11, the punch 30 of the forming apparatus shown in FIG. 3 is used, in which the outer peripheral surface has a helical tooth profile for forming internal teeth (helical teeth) 12C. The molding apparatus is the same as the molding apparatus described above except for. In the above embodiment, the tooth profile 44 that meshes with the tooth profile 22 of the die 20 is formed at the tip of the second punch 40, and the tooth profile 44 is meshed with the tooth profile 22 on the die side to separate the excess w. But the second punch 40
It is also possible to finish the molding process before engaging with the die 20 and take out the molded product, and remove burrs by cutting or the like in a later process.

[0021]

As is apparent from the above description, according to the tooth forming profile and tooth forming method of the present invention, the tooth profile (forming part) on the die side plastically deforms the material in the axial direction. Since the end face on the opening side of the slag cylinder is pressed by the punch, the axial flow of the material is blocked and the material flows into the tooth profile trough on the punch side and fills the trough. Sufficient tooth forming profile is obtained. Therefore, the tooth-formed shaped article according to the present invention has excellent strength and can be used in a wide range of applications (for example, clutch drums, clutch hubs, toothed pulleys, etc.). Further, in the method of the present invention, the tooth profile on the first punch side and the tooth profile on the die side are meshed in the axial direction and the material is plastically deformed to form the tooth profile, so that the tooth profile effective portion can be formed up to the cup bottom position. it can.

[Brief description of drawings]

1A is a perspective view of a cup-shaped slug before a tooth profile is formed, and FIG. 1B is a perspective view of a cup-shaped gear after tooth formation.

FIG. 2 is an enlarged horizontal sectional view of the tubular portion of the cup gear.

FIG. 3 is a vertical cross-sectional view before a punch and a die of a device for forming a tooth profile are engaged with each other.

FIG. 4 is a vertical cross-sectional view showing a state where a punch and a die of a device for forming a tooth profile are engaged with each other.

FIG. 5 is a perspective view of a second punch.

FIG. 6 is a vertical sectional view showing a state of a punch and a slag die before molding.

FIG. 7 is a vertical cross-sectional view showing a punch, a slug, and a die at the time of molding.

8 is a sectional view taken along line VIII-VIII shown in FIG.

9 is a sectional view taken along line IX-IX shown in FIG. 7.

FIG. 10 is an explanatory diagram for explaining how the material is deformed.

FIG. 11 is a perspective view of a tooth forming model according to another embodiment of the present invention.

FIG. 12 is a sectional view showing a conventional molding method.

[Explanation of symbols]

 W cup-shaped slag w excess thickness portion 10,10A cup-shaped gear which is a tooth forming product 11 cylindrical portion 12A, 12B, 12C tooth profile 13a, 13b, 13c crest portion 14a, 14b, 14c valley portion 20 die 22 tooth profile 23 mountain portion 24 Valley part 23a Introductory part 23b Forming part 28 Slug retainer 30 First punch 32 Tooth profile 33 Crest part 34 Valley part 40 Second punch 44 Tooth profile for cutting surplus part

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[Procedure amendment]

[Submission date] March 24, 1993

[Procedure Amendment 2]

[Document name to be amended] Statement

[Name of item to be amended] Claims

[Correction method] Change

[Correction content]

[Claims]

Front Page Continuation (72) Inventor Satoshi Nito 1-19, Gomijima, Fuji City, Shizuoka Prefecture Yamakawa Industrial Co., Ltd. (72) Inventor Takashi Nakano 2-10 Oyamamachi, Sagamihara City, Kanagawa Ida Engineering Co., Ltd. (72) Inventor Kazuo Ashihara 2-10 Oyama-cho, Sagamihara-shi, Kanagawa Aida Engineering Co., Ltd.

Claims (3)

[Claims] 1. A first punch having a bottomed cup-shaped slug loosely inserted therein and having a molding tooth profile formed on the outer peripheral surface thereof, and an inner peripheral surface aligned with the tooth profile of the punch side and having a heap larger than the plate thickness of the slag. In a state in which the opposed die on which the forming tooth profile having a small depth of the valley is formed, the slag bottom is pressed and held by the first punch tip surface,
The second punch arranged on the outer circumference of the first punch presses the end surface on the opening side of the slag cylindrical portion to mesh with each other in the axial direction and plastically deform the material in the axial direction, so that the material flows into the tooth profile valley portion of the punch. A tooth-forming shaped article, characterized in that the tooth profile is formed by plastic deformation on both inner and outer sides of the cylindrical portion by filling. 2. A cup-shaped slug with a bottom is loosely inserted into a first punch having a molding tooth profile formed on the outer peripheral surface, and the first punch and the inner peripheral surface are aligned with the tooth profile on the punch side to form The opposite die having the tooth profile is axially bitten by pressing the end face of the slug cylindrical portion opening side with the second punch while the slag bottom is pressed against the first punch tip face by the slug retainer. A tooth forming method characterized in that the material is also plastically deformed in the axial direction, the material is flow-filled in the tooth profile valleys of the first punch, and the tooth profile is formed by plastic working on both inner and outer sides of the cylindrical part. 3. A tooth profile that meshes with a molding tooth profile on the opposite die side is formed at the tip of the second punch.
Engage the tooth profile on the punch side and the tooth profile on the opposite die side of
The tooth forming method according to claim 2, wherein a surplus portion raised above the cylindrical portion is cut during the tooth forming shape.