JPS61169126A - Manufacture of anchor for drum braking - Google Patents

Abstract

PURPOSE:To produce an anchor easily and inexpensively by projecting the pin for rivet fitting and flange part integrally from the block part with deforming plastically one part or the whole part of the blank in the thickness reducing direction. CONSTITUTION:A flange part 26 is preliminarily formed by subjecting a blank to a forging between the upper die and lower die. The flange pat 26 having a spring pressing part 37 is completed then by subjecting the flange part 26 to a blanking. Further when the upper die punch 40 is thrusted in from the face 36 of the opposite side to the face 22 which is to come into contact with the backing plate of a semi-product 29 using a lower die 38 and upper die punch 40, a thrust-in hole 42 is formed on the face 36 and the pin 24 for rivet fitting is formed as well. The anchor is obtd. by subjecting this semi-product 31 to a bending by press and by bending the spring pressing part 37 in the aparting direction from the backing plate.

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field The present invention relates to a method of manufacturing an anchor for a drum brake.

Problems to be Solved by the Prior Art and the Invention Generally speaking, a drum brake has two main parts: a thick plate-like anchor block against which one end of the brake shoe is abutted, and a seven-carrier whose outer periphery is larger than that of the anchor block. The plates are riveted by a common anchor head. In such conventional cases, anchor blocks, anchor plates, and anchor rivets are manufactured individually, and matching anchor blocks, anchor plates, and anchor rivets are prepared and installed for each banking plate. was. For this reason, the number of man-hours required is large, and there are cases in which parts are assembled in incorrect positions or parts are missing.

On the other hand, Anchor Pro 7ri, Anchor Plate,
Another method is to manufacture an anchor integrally equipped with an anchor rivet by cutting, but this requires a long cutting time, making the anchor expensive. Therefore, a method for manufacturing anchors easily and inexpensively is desired.

Means for Solving the Problems The present invention has been made against the background of the above circumstances.
The gist of this is that there is a thick plate-like block part that is fixed to the backing plate 1, and one end of the brake shoe is abutted on both end faces, and A method for manufacturing a drum brake anchor integrally equipped with a protruding rivet mounting pin and a flange portion protruding toward the outer circumferential side from an outer circumferential edge portion of the block portion opposite to the backing play 1, the method comprising: The riveting pin and the flange portion are integrally provided to protrude from the block portion while plastically deforming a part or the whole of the block portion.

In this way, the riveting pin and the flange portion are integrally protruded from the block portion by performing plastic working with a relatively short processing time, so that the anchor block, anchor plate, An anchor integrally equipped with an anchor rehet can be easily and inexpensively manufactured.

EXAMPLE Hereinafter, an application example of the present invention will be described in detail based on the drawings.

In FIG. 2, backing play-1-10-! A pair of brake shoes 14, 16 are attached to the wheel cylinder 12, and one end of the brake shoes 14, 16 is abutted against an anchor 18, respectively.

As shown in FIG. 1, the anchor 18 includes a thick plate-shaped block portion 2o on both end surfaces of which one end of the brake shoes 14 and 16 is abutted, respectively, and a surface 22 of this block portion 20 that contacts the backing plate 1o. It integrally includes a riveting pin 24 that protrudes from the block portion 20 and a flange portion 26 that protrudes toward the outer circumferential side from the outer circumferential edge portion of the block portion 20 on the side opposite to the backing plate IO. As shown in FIG. 3, the anchor 18
A riveting pin 24 is inserted into a mounting hole 28 formed in the backing plate 10, and the tip of the riveting pin 24 is crushed by a paper tool, thereby being fixed to the backing plate 10.

Next, the manufacturing process of the anchor 18 will be explained.

First, a material 30 (not shown in FIG. 4) is prepared. This material 30
is the block portion 20 of the anchor 18 in the longitudinal and lateral dimensions.
It is larger and approximately the same as the anchor 18 in terms of thickness. This material 30 is used in the upper die 3 for forging shown in FIG.
2 and a lower mold 34, and cold or hot forging is performed to preform the flange portion 26. As a result, the surface 3 of the outer circumferential portion of the material 30 for forming the flange portion 26 is opposite to the surface 22 that should be in contact with the backing plate 10.
It is made to protrude from the outer peripheral edge of 6 toward the outer peripheral side, and
The outer shape of the block portion 20 is formed.

A machined hole 35 having the same size and shape as the block portion 20 is formed in the upper die 32. The broken line in FIG. 5 shows the outer shape after this preforming, and FIG. 6 shows a perspective view of a semi-finished product 27 in which the blank 30 has been subjected to this preforming.

Next, by blanking the preformed flange portion 26 using a cutting die (not shown), the seventh
As shown in the semi-finished product 29 in the figure, the flange portion 26 having the spring retaining portion 37 is completed.

Further, a lower die 38 and a second die punch 40 shown in FIG.
When the upper die punch 40 is inserted into the surface 36 of the semi-finished product 29 opposite to the surface 22 which should be in contact with the backing plates 1 and 10, a penetration hole 42 is formed in that surface 36, and the block The meat inside the portion 20 is pushed out into the hole 44 formed in the lower mold 38, and the riveting pin 24 is formed. The lower mold 38 has a fitting hole 3 into which a semi-finished product 29 shown in FIG. 7 is fitted.
9 is formed, and a hole 44 for forming the riveting pin 24 is bored in the bottom surface of the fitting hole 39. FIG. 9 shows a semi-finished product 31 that has been subjected to such processing. And the semi-finished product 31 obtained in this way
By applying a bending process using a press, the spring holding portion 37 is bent in a direction away from the backing plate 10, thereby obtaining the anchor 18 shown in FIG. 1. Note that the bending process of the spring holding part 37 can also be performed simultaneously with the blanking process for obtaining the semi-finished product 29 shown in FIG. Further, there are cases where the bending process does not need to be performed.

According to this embodiment, the riveting pin 24 and the flange portion 26 can be efficiently attached to the block portion 2 by performing plastic working which requires relatively less processing time than cutting work or the like.
Since the anchor I8 is integrally provided with a block portion 20 corresponding to an anchor block, a flange portion 26 corresponding to an anchor plate, and a riveting pin 24 corresponding to an anchor re-het, it is easy and inexpensive. It is manufactured in

Next, another method of manufacturing the anchor 18 will be explained.

In the following embodiments, the same parts as those described above are denoted by the same reference numerals, and the explanation thereof will be omitted.

In order to obtain the semi-finished product 29 shown in FIG. 7 from the material 54,
An upper die 50 and a lower die 52 for forging shown in FIG. 10 may also be used. The upper die 50 and the lower die 52 apply plastic deformation in the thickness direction to the entire moon 54 to form the block portion 2.
0 and the flange portion 26 all at once, and the upper mold 50 and lower mold 52 have holes that form a space similar to that of the semi-finished product 29 shown in FIG. 7 when they are put together. 56 and 58 are provided respectively.

Although the material 54 has a thick plate shape substantially similar to the material 30, it is plastically deformed in the thickness direction, so the anchor 1
8, and has substantially the same vertical and horizontal dimensions as the block portion 20.

The broken line in FIG. 10 shows the outer shape after processing. According to this embodiment, in addition to obtaining the same effects as the previous i'AS embodiment, there is an advantage that blanking for forming the flange portion 26 is not required.

Note that, as in the embodiment shown in FIG. 11, the blanking process may be performed after the material 54 is plastically deformed in the thickness direction to preform the flange portion 26. In this case,
The machined hole 60 of the lower die 52 is formed larger than the machined hole 58.

Furthermore, another method of manufacturing the anchor 18 will be explained.

First, a short cylindrical material 62 shown in FIG. 12 is prepared and subjected to plastic working using an upper forging die 64 and a lower die 66 shown in FIG. 13. These upper mold 64 and lower mold 66 convert the raw material 62 into a semi-finished product 68 without the flange portion 26 shown in FIG.
The upper mold 64 and the lower mold 6
6 has a machined hole 70 that has the same vertical and horizontal dimensions as the block part 20 and forms a space that is thicker than the anchor 18.
．． 72 are provided respectively. A hole 74 is provided at the bottom of the processed hole 72, and as shown by the broken line in FIG. 13, a part of the flesh of the material 62 is pushed out into the hole 74, whereby the riveting pin 24 is preformed. It looks like this.

Next, the semi-finished product 68 is subjected to plastic working using an upper mold 76 and a lower mold 78 (not shown in FIG. 15) to preform the flange portion 26, thereby obtaining a semi-finished product 79 shown in FIG. 16. The lower mold 78 is provided with a machined hole 80 large enough to accommodate the semi-finished product 79, and the bottom of the machined hole 80 is provided with a hole 82 for molding the riveting pin 24. , when the semi-finished product 79 is further compressed between the upper die 76 and the lower die 78, the riveting pin 24 is completed.

Then, the anchor 18 is obtained by subjecting the semi-finished product 79 to the same blanking process as described above to form the flange portion 26 into the final shape, and by subjecting it to bending process to bend the spring presser portion 37 at a predetermined angle.

In this embodiment as well, the flange portion 26 and the riveting pin 24 are integrally protruded by plastic working, so the same effect as in the above-mentioned embodiment can be obtained, as well as the advantage that an upper die punch is not required. There is.

Although one embodiment of the present invention has been described above, the present invention can be applied to other embodiments.

For example, as shown in FIG. 17, one riveting pin 84 may be provided protruding from the center of the surface 22 of the anchor 18 on the banking plate 10 side. In this case, in order to insert the rivets into the square holes formed in the rivet king plate 1o, the cross-sectional shape is made square as shown in FIG. Rotation is prevented.

The riveting pin 84 may have the cross-sectional shape shown in FIGS. 18(b) to 18(d).

Further, as shown in FIGS. 19 and 20, a hole or a protrusion provided in the anchor plate 10 is engaged with an end of the surface 22 on the anchor plate 1-] 0 side of the anchor 18 shown in FIG. 17. Protrusion 86 that acts to prevent rotation
Alternatively, holes may be formed on the 8th.

The above-mentioned embodiment is merely one embodiment of the present invention, and various modifications may be made to the present invention without departing from the spirit thereof.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing the anchor of the drum brake shown in FIG. 2. FIG. FIG. 2 is a front view showing a drum brake including an anchor to which the present invention is applied. Figure 3 is the first
FIG. 3 is a sectional view of a main part showing the attached state of the anchor shown in the figure. 4.6.7.9 is a perspective view showing a partial product and a semi-finished product when manufacturing the anchor of FIG. 1, respectively. FIG. 5 is a diagram for explaining the process of processing the raw material shown in FIG. 4M into the semi-finished product shown in FIG. 6, and FIG. 8 is a diagram for explaining the process of processing the material shown in FIG. It is a figure for explaining the process of adding 1-. Figures 10 and 11 are
FIG. 7 is a diagram for explaining other aspects of the steps shown in the figures. Figures 12, 14 and 16 are perspective views respectively showing a raw material and a semi-finished product in another application example of the present invention. Figure 13 is a diagram for explaining the process of processing the raw material shown in Figure 12 into the semi-finished product shown in Figure 14, and Figure 15 is a diagram showing the process from the semi-finished product shown in Figure 14 to the broken line in Figure 16. It is a figure for explaining the process of processing into a semi-finished product. FIG. 17 is a perspective view showing another embodiment of the anchor to which the present invention is applied, and FIGS. 18(a) to 18(d) are cross sections of a riveting pin protruding from the anchor shown in FIG. 17. It is a figure which shows the example of a shape, respectively. FIGS. 19 and 20 are sectional views showing other embodiments of the anchor to which the present invention is applied. 10: Hasoking plate 12: Wheel cylinder 14, I6: Brake shoe 18: Anchor 20 Niblock part 24: Rivet mounting pin 26: Flange part Applicant: Hosei Brake Industry Co., Ltd. Procedural amendment (voluntary) January 1985 30 days

Claims (1)

[Scope of Claims] A thick plate-shaped block portion fixed to a backing plate and having one end of a brake shoe abutted on both end surfaces, a riveting pin protruding from a surface of the block portion that is in contact with the backing plate; A method for manufacturing a drum brake anchor integrally comprising the backing plate of a block part and a flange part protruding from the outer peripheral edge on the opposite side to the outer peripheral side, the method comprising plastically deforming part or the entire material in a direction of decreasing thickness. A method for manufacturing an anchor for a drum brake, characterized in that the riveting pin and the flange portion are integrally provided to protrude from the block portion.