JP2590425Y2 - Forging machine for cylindrical parts with slits - Google Patents

Description

[Detailed description of the invention]

[0001]

The present invention relates to a multi-stage forging apparatus,
In particular, the present invention relates to a head forming apparatus for forming a cylindrical part having a slit on a peripheral surface at one end.

[0002]

2. Description of the Related Art As disclosed in Japanese Utility Model Publication No. 5-30826, for example, a material is fixed by a die fixed to a machine base and a punch fixed to a ram that moves forward and backward with respect to the machine base. There is known a multi-stage forging apparatus in which a plurality of forging stations for forging into a predetermined shape are provided, and a material of a predetermined shape is formed by sequentially supplying a material to these forging stations. When a cylindrical part is manufactured by the forging apparatus of the above, the apparatus is configured as follows.

That is, as shown in FIG. 12, a fixed punch B having a diameter smaller than the inner diameter of a die A is disposed inside a die A, and a cylindrical stripper C is disposed at a rear portion of a space formed between the two. A, the outer peripheral surface of the fixed punch B and the front end surface of the stripper C form a cavity D, and a material is driven into the cavity D by a movable punch F, whereby the material is removed from the cavity D.
Into a product E having a shape corresponding to. And then
The product E is discharged from the die A by moving the stripper C forward.

[0004]

By the way, it is attempted to form a cylindrical product 1 having slits 2 and 3 at one end as shown in FIGS. In this case, as shown in FIG. 15, on the peripheral surface of the end portion of the fixed punch G, the convex portions G1 and G2 are provided on the portions corresponding to the slit portions 2 and 3 of the product 1, and the portions corresponding to the non-slit portions 4 are provided. By providing a concave portion G3 and driving one end of a cylindrical material into the end of the fixed punch G with a movable punch, slits 2 and 3 as shown in FIGS.
It is conceivable to configure so that

However, with such a configuration, the slits 2, 3
Is formed, the slits 2, 3 and the non-slit portion 4 of the product 1 are firmly engaged with the convex portions G1, G2 and the concave portion G3 of the fixed punch G, so that the product 1 after molding is discharged. It becomes difficult.

Since the outer diameter of the fixed punch G becomes equal to the outer diameter of the product 1 as shown in FIG.
The end face of the product 1 cannot be pushed by the tubular stripper C fitted outside the fixed punch B as shown in FIG. For this reason, in the related art, it has not been possible to manufacture a cylindrical component having the above-described slit with a forging apparatus, and the slit was formed by machining the cylindrical material.

Accordingly, an object of the present invention is to make it possible to manufacture a cylindrical part having a slit at one end by a multistage forging apparatus.

[0008]

Means for Solving the Problems In order to solve the above problems, the present invention is characterized in that it is configured as follows.

That is, the forging apparatus according to the present invention has a plurality of forging stations having a pair of dies and punches. At these forging stations, an axial direction is formed at one end from a columnar material through a predetermined forging process. For producing a cylindrical part having a slit, the former forging station for preforming the slit at one end while forming the material into a cylindrical shape, and a slit forming station following these stations In the die of this slit forming station, a convex portion for final forming the slit portion of the part and a concave portion to which the non-slit portion is fitted are provided on the peripheral surface of the end portion. It has a fixed punch for final forming the slit by press-fitting the end, and corresponds to the concave portion on the peripheral surface of the fixed punch. A groove in the axial direction is formed over the entire length of the fixed punch, and by sliding forward in the groove after forging, the slit and the non-slit of the fixed punch are engaged with the convex and concave portions of the fixed punch. A knockout member is provided for pushing the end face of the non-slit portion to discharge the product from the die of the station.

[0010]

According to the above arrangement, in the die of the slit forming station, the fixed punch having the convex portion for finally forming the slit portion of the component and the concave portion for fitting the non-slit portion to the outside is formed in the former station. The end of the formed intermediate product is driven by the punch on the movable side, whereby a slit having a predetermined shape is formed at the end of the intermediate product. Then, the slit portion and the non-slit portion are firmly engaged with the concave portion.

However, at the position corresponding to the concave portion on the peripheral surface of the fixed punch, an axial groove is formed over the entire length thereof. After the forging, the knockout member advances from the rear along the groove, and By pressing the end face of the non-slit part of the part, the part is reliably discharged from the die of the station.

[0012]

Embodiments of the present invention will be described below.

FIG. 1 shows a schematic configuration of a multi-stage forging apparatus 10 according to this embodiment.
Has six dies 21 to 26 arranged side by side on the machine base 11,
The same dies 21 to 26 and the corresponding punches 21 to 26 are provided with the same six punches 31 to 36 attached to the ram 12 approaching and separating from the machine base 11 so as to face the dies 21 to 26, respectively. Stations X1 to X5 for forging of 5 stages with 31 to 36 and auxiliary station X of the last stage
6 are constituted.

Then, a wire material supplied from the outside is cut into a predetermined size by a material cutting device 13 provided at one end of the machine base 11 to form a material, and the material is formed by a chuck device (not shown). In addition to sequentially supplying the stations X1 to X6, in the first to fifth stations X1 to X5,
The material or the intermediate product is driven into the dies 21 to 25 through the punches 31 to 35 by the advancement of the ram 12, and is formed into a shape corresponding to the cavity formed in the dies 21 to 25. Is manufactured into a final product having a predetermined shape.
In No. 6, the swarf generated during the production of the product is discharged.

Here, the head forming apparatus 1 according to the present embodiment.
In some cases, as shown in FIGS. 13 and 14 described above, the cylindrical part 1 having two slits 2 and 3 slightly different in shape on the opposite side of the peripheral surface at one end by 180 ° is manufactured. It has become.

Next, the dies 21 to 26 of the stations X1 to X6 and the punch 31
Structures Nos. To 36 will be described.

FIG. 2 shows a solid columnar material 1 formed by cutting a wire into a predetermined size by the material cutting device 13.
00, and the material 100 is the first station X
1 is supplied.

The structure of the first station X1 is as shown in FIG. 3, and the machine base 11 is provided with a die 21 and a knockout pin 41 whose front end is located at the back of the cavity forming recess 21a. Ram 1
On the second side, there is provided a punch 31 whose leading end protrudes into the concave portion 21a of the die 21 when the die is advanced.

The material 100 supplied into the concave portion 21a of the die 21 is formed by the inner peripheral surface or the inner peripheral portion of the concave portion 21a, the distal end surface of the knockout pin 41, and the distal end surface of the punch 31. The first intermediate product 101 corresponding to the shape of the cavity is formed, and after the punch 31 is retracted after the molding,
The knockout pin 41 moves forward to move the first intermediate product 1
01 is discharged from the die 21.

The first intermediate product 101 is supplied into the cavity forming recess 22a of the die 22 at the second station X2 shown in FIG. The forging station X2 is also provided with a knockout pin 42 having a front end portion facing the inner side of the concave portion 22a of the die 22, and the first intermediate product 101 is provided on the inner peripheral surface or the inner side of the concave portion 22a of the die 22. A second portion corresponding to the shape of the cavity formed by the peripheral portion of the surface, the distal end surface of knockout pin 42, and the distal end surface of punch 32 on ram 12 side.
The intermediate product 102 is formed. Then, also at the forging station X2, the second intermediate product 102 is discharged from the die 22 by the advance of the knockout pin 42.

Here, on the end face of the second intermediate product 102 on the punch 32 side, a protruding portion 32a at the tip of the punch 32 is provided.
Thereby, a concave portion 102a for hollowing the product is formed.

Next, the second intermediate product 102 is supplied to a third station X3 shown in FIG.
At this time, the second intermediate product 102 is turned upside down, and the concave portion 102a formed by the punch 32 in the second station X2 is directed to the die 23 side.
3.

The die 23 is provided with a through-hole 23a. In the through-hole 23a, the concave portion 102a of the second intermediate product 102 is further deepened to make the product into a hollow cylindrical shape having one end closed. A punch 43 is disposed, and an outer peripheral surface of the fixed punch 43 and the through hole 23 are formed.
A cylindrical stripper 44 is arranged between the inner peripheral surface of the stripper 44 and the inner peripheral surface a.

Then, the second intermediate product 102 is driven into the through hole 23a of the die 23 by the punch 33 on the ram 12 side, thereby forming a cylindrical shape having one end closed and chamfering the inner periphery at the other end. The third intermediate product 103 provided with the portion 103a is obtained. Then, in the third station X3, the third intermediate product 103 formed as described above is discharged from the die 23 by the advance of the stripper 44.

Next, the third intermediate product 103 is supplied to a fourth station X4 shown in FIG. 6, and the fourth station X4 is also supplied to the third station X4.
3, a fixed punch 45 and a stripper 46 are provided in a through hole 24a provided in the die 24, and the stripper 4 in the fourth station X4.
6, two protrusions 46a, 180
46b is provided.

The third intermediate product 103 is the ram 1
By being driven into the die 24 by the two punches 34, as shown in FIG. 7, two slit forming notches 104a, 104
Thus, a cylindrical fourth intermediate product 104 provided with b is obtained. Also at the fourth station X4, the fourth intermediate product 104 is discharged from the die 24 by the advance of the stripper 46.

As described above, one end has a closed cylindrical shape, and the other end has a slit 2 in the end product.
The fourth intermediate product 104 having the cut portions 104a and 104b serving as the original shape of No. 3 is supplied to the fifth station X5 having the configuration of the characteristic portion of the present invention.

As shown in FIGS. 8 to 10, the fixed punch 47 disposed in the die 25 in the fifth station X 5 has a small diameter whose tip corresponds to the inner diameter of the final product (tubular part) 1. The portion 47a has a large-diameter portion 47b having a diameter corresponding to the inner diameter of the through hole 25a of the die 25, and a flange portion 47c is provided at the rear end to be fixed in the die 25. And the small diameter portion 47a
Are provided with two convex portions 47d and 47e corresponding to the shapes of the slits 2 and 3 in the final product 1 and having an outer diameter equal to the large-diameter portion 47b at positions opposite to each other by 180 °. The portions excluding the convex portions 47d and 47e are concave portions 47f and 4
7f.

In addition, two grooves 47 extending from the rear end to the front end of the punch 47 are provided on the peripheral surface of the fixed punch 47 at positions corresponding to the positions of the recesses 47f, 47f.
g, 47g are formed, and knockout pins 48, 48 are provided to slide forward in the grooves 47g, 47g from behind the punch 47, and these pins 48, 48 are slid forward. A pushing shaft 49 to be moved is provided at the rear.

On the other hand, the punch 35 on the ram 12 side in the fifth station X5 has a cylindrical shape whose outer diameter is equal to the inner diameter of the through hole 25a of the die 25, and a punch for punching is formed in the cylindrical punch 35. 50 are slidably fitted back and forth.

With such a configuration, the fourth intermediate product 104 driven into the through hole 25a of the die 25 by the punch 35 is provided at the small diameter portion 47a at the tip of the fixed punch 47 disposed in the die 25. Two convex parts 47
The cut portions 104a and 104b formed at the fourth station X4 are further deepened by d and 47e to form the slits 2 and 3 in the tubular part 1 as a final product, and the punch 50 for punching advances. As a result, the bottom 104c of the fourth intermediate product 104, which is closed at one end, is punched.

As a result, it is formed into a completely penetrated cylindrical shape,
In addition, a cylindrical part 1 as a final product having two slits 2 and 3 at one end is obtained.

In this case, the cylindrical part 1 is
5, the slits 2, 3 are formed in the projections 47 d, 47 e at the tip of the fixed punch 47, and the non-slit portions 4 4 are firmly engaged with the recesses 47f, 47f, respectively, and the outer diameter of the component 1 is equal to the outer diameter of the large diameter portion 47b of the fixed punch 47.
Strippers 44 at the fourth stations X3 and X4,
The cylindrical component 1 cannot be discharged from the die 25 with the same configuration as the component 46.

Therefore, at the fifth station X5,
Knockout pins 48, 48 are pushed by rearward extruding shafts 49 in two grooves 47g, 47g provided on the peripheral surface of the fixed punch 47 from the rear end to the front end of the punch 47, and move forward. Thus, the front end thereof comes into contact with the end faces of the non-slit portions 4 and 4 of the component 1, and the component 1 is pushed forward. Thus, the cylindrical part 1 as the final product is discharged from the die 25.

Then, this cylindrical part 1 is further provided in FIG.
Is supplied to the auxiliary station X6 shown in FIG. 5, and is inserted into the through hole 26a of the die 26 in the station X6, and the stripper 51 provided in the die 26
And the cylindrical punch 36 on the ram 12 side, the scraper punch 52 provided in the stripper 51 so as to be able to slide back and forth within the stripper 51 and remained in the part 1. Dust 5 (104) is discharged.
After that, the stripper 51 advances, and the tubular component 1 is discharged from the die 26.

[0036]

As described above, according to the head forming apparatus according to the present invention, when manufacturing a cylindrical part having a slit at one end, the slit part of the part and the non-slit part are formed in the die of the slit forming station. Are firmly engaged with the projections and recesses of the fixed punch forming them, but the knockout member is provided from the rear along a groove provided in the axial direction over the entire length of the peripheral surface of the fixed punch. Moves forward and presses the end face of the non-slit portion of the part, whereby the part is reliably discharged from the die of the station.

As a result, it is possible to process a slit of a cylindrical part, which has conventionally been difficult to form using a forging apparatus of this type, and the productivity of this type of part is improved.

[Brief description of the drawings]

FIG. 1 is a schematic plan view of a head forming apparatus according to an embodiment of the present invention.

FIG. 2 is a half sectional view showing a raw material used in the above device.

FIG. 3 is a cross-sectional view illustrating a configuration of a first station of the apparatus.

FIG. 4 is a sectional view showing a configuration of a second station.

FIG. 5 is a sectional view showing the configuration of a third station.

FIG. 6 is a sectional view showing the configuration of a fourth station in the same manner.

7 is a cross-sectional view of the intermediate product taken along line yy in FIG.

FIG. 8 is a sectional view showing a configuration of a fifth station of the above device.

FIG. 9 is a cross-sectional view taken along line zz of FIG. 8;

FIG. 10 is a perspective view showing a fixed punch and a knockout pin at a fifth station and a final product formed at the station.

FIG. 11 is a sectional view showing a configuration of a sixth station of the above device.

FIG. 12 is a sectional view showing a general configuration of a conventional forging station.

FIG. 13 is a sectional view of a tubular part manufactured by the device according to the present embodiment.

FIG. 14 is a sectional view taken along line xx of FIG. 13;

FIG. 15 is a perspective view for explaining a conventional problem.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Cylindrical part 2, 3 Slit 4 Non-slit part 10 Forging apparatus 21-26 Dies 31-36 Punch 47 Fixed punch 47d, 47e Convex part 47f Concave part 47g Groove 48 Knockout member X5 Slit forming station

Claims (1)

(57) [Scope of request for utility model registration] 1. A plurality of forging stations having a pair of dies and punches, and a cylindrical part having an axial slit at one end is manufactured from a columnar material through a predetermined forging process at these forging stations. A forging apparatus for performing preforming of a slit at one end while forming the above-mentioned material into a cylindrical shape, and a slit forming station following these stations. Inside, the end peripheral surface has a convex portion that finally forms the slit portion of the part and a concave portion where the non-slit portion is externally fitted, and the end portion of the intermediate product molded in the preceding station is press-fitted. And a fixed punch for finally forming the slit is provided, and the entire length of the fixed punch is set at a position corresponding to the concave portion on the peripheral surface of the fixed punch. Along the axial groove formed, and by sliding forward in the groove after forging,
A knockout member is provided which pushes the end face of the non-slit portion of the product in which the slit portion and the non-slit portion are engaged with the convex portion and the concave portion of the fixed punch and discharges the product from the die of the station. A forging machine for cylindrical parts with slits.