JPS6384734A - Manufacture of toothed cup shaped body - Google Patents

Abstract

PURPOSE:To eliminate a tooth profile underfill part and to form the tooth profile at the time of a finishing press work correctly by providing a projection part at the projecting part and upper part of the punch and die performing the rough tooth profiling of the peripheral wall face of a cup shaped steel plate blank and giving a pressing force on the upper face of the peripheral wall of the blank. CONSTITUTION:A cup shaped blank 1 is placed on the counter punch 35 of the die 33 having uneven tooth profile parts 33A, 33B on the inner face of a forming aperture 3, the punch 21 having the uneven tooth profiles 21A, 21B engaged with the outer peripheral face of the upper part corresponding to the die 33 tooth profile is press-fitted with its descent and the cup shaped blank 1 is formed in the cup shaped body 26 with a rough tooth profile having a rough worked tooth profile on the outer peripheral face 2. A finishing is performed thereafter with the finishing die and punch of the similar structure. A forming underfill part is eliminated by pressing the upper face of the peripheral wall part 2 with the projecting part 22 whose outer edge reaches to the upper face of the peripheral wall part 2 of the cup shaped blank 1 at the upper part of the tooth profile projecting part 21B of a rough working punch 21. The tooth profile part is made in a correct good shape with a finishing press thereafter. The forming is made in a better shape by providing a projection part even on the tooth profile projection part of the punch for finishing.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a method for manufacturing a cup-shaped article with teeth from a cup-shaped steel plate material using a punch or a die, and in particular, the present invention relates to a method for manufacturing a cup-shaped article with teeth from a cup-shaped material made of a steel plate. The present invention relates to an improvement in a method of applying a pressing force to the upper surface of a peripheral wall, and relates to a method that can be used to manufacture timing boots, gears, or the like.

[Background technology and its problems]

In order to manufacture the toothed cup-shaped object 36 shown in FIG. 5 from the steel plate cup-shaped material 1 shown in FIG. 3, the method shown in FIG. 4 has conventionally been carried out. The cup-shaped material 1 placed on the counter punch 35 is pushed into the forming hole 34 of the die 33 fixed to the die housing 32 by the descending punch 31, and as the punch 31 further descends, the outer peripheral surface of the punch 31 The peripheral wall portion 2 of the cup-shaped material 1 is formed by the tooth forming concave portion 31A and the convex portion 31B formed on the tooth forming convex portion 33B and the concave portion 33A formed on the inner peripheral surface of the forming hole 34 of the die 33.
is formed into a toothed shape, and a toothed portion 37 is formed on the outer peripheral surface of the toothed cup-shaped member 36.

According to this method, the inclined guide surface 33 on the upper surface of the convex portion 33B
When the peripheral wall portion 2 is subjected to tooth forming processing at C, the inclined guide surface 33
Because of the upward machining force from C, the thickness of the peripheral wall portion 2 is pulled upward and moved, resulting in a lack of thickness 38 at the bottom of the toothed portion 37, as shown in FIG.

Therefore, the present applicant has provided the manufacturing method shown in FIG. 8, which uses the punch 21 shown in FIG. 7.

In this method, the punch 21 has recesses 21A and protrusions 21B alternately formed in the circumferential direction on the lower outer peripheral surface of the punch 21, and a protrusion 22 is provided on the upper part of each protrusion 21B. There is.

These protrusions 22 come into contact with the upper surface of the peripheral wall 2 and apply a pressing force during tooth formation, so that the above-mentioned upward movement of the meat of the peripheral wall 2 is prevented, and as a result, the manufactured toothed cup shape It is possible to prevent a lack of thickness from occurring at the lower part of the tooth-shaped portion 27 of the object 26.

FIG. 9 shows a sectional view taken along the line IX-IX in FIG.
2 is in contact with a part of the upper surface of the peripheral wall portion 2, which will become the tooth tip portion 27A of the tooth profile portion 27 after tooth formation. In order to reliably prevent the occurrence of underfilling, it is preferable to increase the pressing force applied to the peripheral wall 2 by the protrusion 22. Therefore, the contact area between the protrusion 22 and the upper surface of the peripheral wall 2 is increased. In other words, it is necessary to increase the amount of radial outward protrusion of the protrusion 22.

However, even if the wall thickness of the peripheral wall portion 2 is t, since the peripheral wall portion 2 has a toothed shape and is extruded radially inward by the concave portions 33A and convex portions 33B of the die 33, the toothed portion 27
The thickness of the tooth tip portion 27A becomes t2.

Here, if the radial clearance S between the protruding part 22 and the recessed part 33A is set to zero and the protruding part 22 is extended to the recessed part 33A and processed, the upper surface of the molded product 26' will have a tooth-shaped part as shown in FIG. 27 has an uneven shape with a raised portion 28, which causes cracks to occur, and furthermore, a die burn-out accident occurs.

Therefore, a clearance S is provided between the protruding part 22 and the recessed part 33A, and as shown in FIG. It is necessary to form a recessed portion 29 by 22.

Therefore, the protrusion amount t of the protrusion 22 becomes small,
For example, when t is 2 mm, t2 is 1.45 mm, and S is 0.
．． Since it is about 51, t ends up being about 1 sq., which causes a problem that a large pressing force to reliably prevent the occurrence of the under-walled portion cannot be obtained.

[Purpose of the invention]

An object of the present invention is to improve the method provided by the present applicant and to provide a method for manufacturing a toothed cup-like article that can reliably prevent the formation of a hollow part in the tooth profile.

[Means and operations for solving the problem] In order to achieve this object, the present invention includes rough processing using a punch and die for rough processing having uneven portions for tooth formation, and
The process is carried out in two stages: a finishing punch with a concave and convex portion for tooth formation, and a finishing process using a die.

Rough processing does not produce a finished product with final dimensions and shape, so
The inner diameter of the tooth forming concave part of the roughing die can be made larger than the outer diameter of the peripheral wall of the cup-shaped material, and the protrusion amount of the protrusion provided at the top of each tooth forming convex part of the roughing punch can be made larger than the outer diameter of the cup-shaped material. It may reach the outer edge of the upper surface of the peripheral wall of the shaped material. Therefore, during rough machining, since the protrusion has a long protrusion amount, the contact area between the protrusion and the peripheral wall becomes large, and the pressing force exerted by the protrusion on the upper surface of the circumferential wall increases. Rough machining is performed while preventing the occurrence of

The dimensions and shapes of the tooth-forming uneven portion of the finishing punch and the tooth-forming uneven portion of the finishing die are set to correspond to the tooth profile of the finished product to be manufactured. The amount of protrusion of the protrusion provided on the upper part of the convex part is set so as to create a clearance in the radial direction between the protrusion and the tooth forming concave part of the finishing die. In this way, even if the amount of protrusion of this protrusion is small and the pressing force applied by the protrusion to the upper surface of the rough-processed product during finishing is small, the rough-processed product has already been formed with a rough tooth profile. During finishing, the amount of movement of the tooth profile portion of the rough-processed molded product is small, so no missing portions occur in the tooth profile portion of the manufactured toothed cup-shaped article.

In addition, for example, when the amount of movement of the flesh of the tooth profile is small due to the shape and size of the tooth profile to be formed, it is unnecessary to provide a protrusion on the finishing punch, and the finishing process is performed using the conventional method shown in Fig. 4. Even if the punch or die is used, there will be no missing parts.

〔Example〕

In the following description, the same reference numerals will be used for the same members or members having the same function as those already described.

The method according to the present invention consists of two stages: rough machining and finishing machining. The punch and die for rough machining are shown in FIG. 1, and the finishing machining is performed in the already explained FIGS. The punch and die shown in Figure 4 or the punch and die shown in Figure 4 are used.

At the bottom of the outer peripheral surface of the rough machining punch 11 shown in FIG.
Similar to the finishing punch 21 shown in the figure, the recess 1 for tooth forming
1A, convex portions 11 are formed alternately in the circumferential direction, and a protrusion portion 12 that protrudes outward in the radial direction is provided on the top of each convex portion 11B. Further, on the inner circumferential surface of the forming hole of the roughing die 13, tooth forming recesses 13A and protrusions 13B are formed alternately in the circumferential direction, similar to the finishing die 33 shown in FIG. Since the rough processing die 13 is not for forming the cup-shaped material 1 into a finished product with the final dimensions and shape, the inner diameter D1 of the recess 13A is the same as the cup-shaped material 1.
The outer diameter D2 of the peripheral wall portion 2 is set to be larger than the outer diameter D2 of the peripheral wall portion 2. Therefore, the protrusion 1 of the rough machining punch 11 is loosely fitted into the recess 13A.
The protruding amount of the protruding portion 2 can be increased, and the protruding portion 12 is formed to exceed the outer edge 2A of the upper surface of the peripheral wall portion 2.

The dimensions and shapes of the tooth forming recesses 21A and protrusions 21B of the finishing punch 21 and the tooth forming recesses 33A and protrusions 33B of the finishing die 33 shown in FIGS. 7 to 9 are the same as those shown in FIGS. It is set to correspond to the tooth profile of the product. As shown in FIG. 9, the clearance S in the radial direction is provided between the concave portion 33A and the protruding portion 22, so as to prevent formation of cracks or the like on the upper surface of the manufactured finished product.

A cup-shaped material 1 is formed using a punch 11 and a die 13 for rough processing.
When rough machining is performed, the protruding portion 12 is formed on the peripheral wall portion 2 as shown in
It abuts from the inner edge 2B to the outer edge 2A of the upper surface, and the abutment area becomes large. Therefore, the pressing force applied to the upper surface of the peripheral wall 2 by the protrusion 12 increases, and the recess 11A and the protrusion 11B of the punch 11, the protrusion 13B of the die 13, and the recess 1
3A, when the peripheral wall portion 2 is subjected to tooth forming by rough machining, no underfill portion occurs.

FIG. 2 shows a rough-processed molded product 16 formed by the above-described rough processing, and a rough-processed molded product 16 has a roughly toothed portion 17 formed therein. In Figure 2, the dotted chain line indicates the protrusion 12.
Shows the contact part with.

The rough-processed molded product 16 includes a punch 21 and a die 3 for finishing processing.
Finish processing is performed by step 3. This finishing process is performed by aligning the tooth profile 17 of the roughly processed molded product 16 with the recess 33A of the die 33. As described above, the protrusion 22 of the punch 21 is provided with a clearance S between it and the recess 33A, so the amount of protrusion of the protrusion 22 is small, and it cannot be applied to the upper surface of the rough-processed molded product 16 during finishing. The pressing force that can be created is becoming smaller. However, the rough-processed molded product 16 has already been formed with a rough tooth-shaped portion 17, so that when the tooth-shaped portion 17 of the rough-processed molded product 16 is formed into the tooth-shaped portion of the final size and shape during finishing, Since the amount of movement is small, even if the pressing force applied to the rough-processed molded product 16 by the protruding portion 22 is small, no underfill portion will occur in the tooth profile of the manufactured toothed cup-shaped article.

In the above embodiment, the amount of protrusion of the protruding portion 12 of the rough machining punch 11 was made to exceed the outer edge 2A of the upper surface of the peripheral wall portion 2 of the cup-shaped material 1. If necessary, the protrusion 12 may reach at least the outer edge 2A of the upper surface.

In the above embodiments, the protrusions 12.22 were provided on the punches 11.21 for rough machining and finishing because the amount of movement of the flesh of the tooth profile to be formed was large. In some cases, the amount of movement is small, and in such cases, applying a pressing force by the protruding portion may be performed only during rough machining, and finishing machining may be performed using the punch 31 and die 33 shown in FIG.

〔Effect of the invention〕

According to the present invention, it is possible to manufacture a toothed cup-shaped article while reliably preventing the occurrence of a lack of thickness in the tooth profile, and it is possible to accurately mold the tooth profile in a predetermined shape.

[Brief explanation of the drawing]

Figure 1 is a cross-sectional plan view of the punch and die during rough machining.
Fig. 2 is a plan view of a rough-processed molded product manufactured by rough processing, Fig. 3 is a perspective view of a cup-shaped material made of steel plate, and Fig. 4 is a conventional method in which no pressing force is applied to the upper surface of the peripheral wall of the cup-shaped material. In addition, FIG. 5 is a perspective view of the toothed cup-shaped article manufactured by the conventional method shown in FIG. FIG. 7 is a partially enlarged view of FIG. 5 showing the occurrence of the process, and FIG. 7 is a punch provided by the applicant to solve the problem of the conventional method shown in FIG. 4, and is used in the finishing process of the present invention. A bottom perspective view of the punch, FIG. 8 is a view similar to FIG. 4 showing the finishing process of the present invention in a method provided by the applicant using the punch of FIG. 7, and FIG. 9 is a view similar to FIG. 8. Fig. 1O is a partial perspective view of a molded product produced by processing the cup-shaped material shown in Fig. 3 by the method shown in Fig. 8 with the clearance S shown in Fig. 9 made zero, and Fig. 11 is a cross-sectional view taken along the line IX-IX. FIG. 3 is a partial perspective view of a molded product similarly processed with a clearance S provided therein. 1... Steel plate cup-shaped material, 2... Peripheral wall portion, 2A.
...Outer edge, 11...Roughing punch, IIA...Four parts, 11B...Protrusion, 12...Protrusion, 13...
Rough processing die, 13A... Concave portion, 13B... Convex portion, 16... Rough processing molded product, 21.31... Finishing punch, 21A. 31A...Concave portion, 21B, 31B...Convex portion, 22.
・Protruding part, 33... Finishing die, 33A...
・Concavity, 33B...Protrusion, S...Clearance. Agent Patent attorney Otama Kinoshita (and 1 other person) Figure 5 Figure 6 North Figure 9

Claims (1)

[Claims] (1) The peripheral wall of the cup-shaped steel plate material is rough-processed using the tooth-forming unevenness on the outer circumferential surface of the rough-processing punch and the tooth-forming unevenness on the inner circumferential surface of the forming hole of the rough-processing die, and then finished. A toothed cup shape in which a tooth-shaped portion is formed on the peripheral wall portion by finishing processing with the tooth-forming unevenness on the outer circumferential surface of the processing punch and the tooth-forming unevenness on the inner circumferential surface of the forming hole of the finishing die. The method for manufacturing an article, wherein during the rough machining, the peripheral wall is removed by a protrusion provided on the upper part of each tooth forming convex part of the rough machining punch and reaching at least the outer edge of the upper surface of the peripheral wall of the cup-shaped material. A method for producing a toothed cup-shaped article, the method comprising applying a pressing force to the upper surface of the toothed cup.