JP2000027914A - Manufacture of disk pad - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for manufacturing a disk pad in which the peripheral part of a frictional member hardly breaks or uneven wears, in a disk pad for a vehicles. SOLUTION: This method for manufacturing a disk pad supplies a back plate and the material of a frictional member among a plurality of metal molds, and compresses and heats the material of the frictional member to fix to the back plate. A back plate assembly 11 in a united shape, in which an even number back plates are arranged symmetrically on both sides of a center line (a), is used instead of the back plate. After forming a disk pad assembly by fixing a frictional member assembly 12 in a united shape to the back plate assembly, the disk pad assembly is cut off at the center line (a) to form a plurality of disk pads.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a method for manufacturing a disk pad for an automobile.

[0002]

2. Description of the Related Art A disc pad for a disc brake in a vehicle has a structure in which a friction material is attached to one surface of a back plate made of an iron-based metal with an adhesive or the like.

[0003] The friction material is a mixture of a fiber material and a binding material. The raw material of the friction material, which is mixed and powdered, is measured and put into a mold at a predetermined weight. As soon as it is done, it becomes a temporary molded product called "unpressed".
Then, the temporary molded product is superimposed on a back plate coated with an adhesive, sent to a press, and subjected to pressure and heat to form a disk pad. However, without going through the bare pressing stage,
It may be formed directly from a powdery state to a state adhered to a back plate. Therefore, in this specification, "the raw material of the friction material" refers to both the powdery material and the temporary molded product.

The disc pad is relatively moved while being pressed against the disc rotor, and the automobile is braked by the frictional force at that time. Therefore, a large shearing force is applied between the friction material and the back plate. Therefore, a strong adhesive force that can withstand this shearing force is required between the friction material and the back plate.

[0005] In order to obtain a strong adhesive force suitable for this purpose, conventionally, the back plate is pressed from a ferrous metal plate-like material and then degreased, thereby causing a decrease in the adhesive force. The oil is removed, the surface is roughened by a dry grid blast method or the like to increase the bonding area, and at the same time, an oxide film or the like (which also causes a reduction in bonding strength) is removed.

[0006] The back plate thus finished,
If left unattended, rust or an oxide film is immediately formed on the bonding surface, and the bonding strength is reduced. Therefore, conventionally, a chemical conversion coating is formed on the above-mentioned roughened back plate from which rust, oxide film, etc. have been removed, and a primer agent is applied and baked thereon to form a primer layer, which is used to prevent rust. Was. Then, a new adhesive was applied on the primer layer, and the friction material was bonded with the primer layer and the newly added adhesive.

FIGS. 3 and 4 are views showing a disk pad used in a conventional disk brake. FIG. 3 is a view showing a back plate, and FIG. 4 is a view showing a temporarily formed product (unpressed). The back plate 1 shown in FIG. 3 is formed by punching an iron-based metal such as a steel plate for an automobile by a press machine, and has two penetrating binding holes 1a. The back plate passes through processes such as degreasing, blasting, formation of a chemical conversion film for rust prevention, and formation of a primer layer after punching by a press machine.

The temporary molded product 2 shown in FIG.
A raised portion 2a, 2a corresponding to a, 1a is formed. When the back plate 1 and the temporary molded product 2 are formed in this way, they are sent to the press shown in FIG. The press machine has a plurality of dies, that is, an upper die 3, a frame die 4, and a lower die 5. Among them, the frame mold 4 is fixed, and the upper mold 3 and the lower mold 5 are configured to be movable in the vertical direction. The upper die 3 has projections 3a, 3a corresponding to the binding holes 1a, 1a.

[0009] As shown in FIG. 5, the temporary molded product 2 is placed on the space between the molds, that is, on the lower mold 5, and the back plate 1 is placed on the frame mold 4. The frame mold 4 has positioning pins (not shown), by which the back plate 1 is positioned. Then, as the lower die 5 rises, the upper die 3 descends, and the back plate 1 and the temporary molded product 2 overlap with each other, pressurizing and heating are performed, and the temporary molded product 2 is compressed into the friction material 7. To the back plate 1 to complete the friction member 8. At this time, the upper portions 2a, 2a
a, 1a, and the upper projections 3a, 3a
a, 1a, and the upper portions 2a, 2a
a, 1a, spreads and fills, closely adheres to the inner wall of the hole, and increases the bonding force.

FIG. 6 shows a completed friction member 8. This friction member 8 is used for a disk brake of an automobile or the like, and a friction surface 7a presses against a disk rotor (not shown) to perform a braking action. become.

[0011]

However, in the above-mentioned prior art, the material may be unevenly filled in the peripheral portion of the back plate, or the peripheral portion may be chipped or unevenly worn when used as a disk pad. There was a problem that happened.

Further, since the bonding between the back plate and the friction material is performed one by one by pressing, the measurement of the molding raw material and the leveling in the mold must be performed individually for each disk pad. , Work efficiency was poor.

The present invention has been made in view of the above-described circumstances, and an object of the present invention is to provide a method of manufacturing a disk pad with less chipping at the peripheral portion and uneven wear. It is another object of the present invention to provide a method of manufacturing a disk pad that can improve the efficiency of a processing operation.

[0014]

According to the present invention, a back plate and a raw material for a friction material are supplied between a plurality of dies, and the raw material for the friction material is compressed and heated to provide a back. In the method for manufacturing a disk pad to be fixed to a plate, in place of the above-mentioned back plate, an integrated back plate assembly in which an even number of back plates are arranged symmetrically on both sides of a center line is used. After a disk pad assembly is formed by fixing an integrally formed friction material aggregate to the disk pad assembly, the disk pad assembly is cut to form a plurality of disk pads. Further, the back plate assembly may be an integral shape in which two back plates are arranged in line symmetry.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a method for manufacturing a disk pad according to the present invention will be described below with reference to the drawings. FIG. 1 is a view showing a state in which a plurality of disk pads are obtained by cutting a disk pad assembly manufactured by the manufacturing method of the present invention.

The back plate assembly 11 shown in FIGS. 1 (a) and 1 (b) is one in which two back plates are arranged symmetrically with respect to a center line a and press-molded as a unit. The material and manufacturing method of the back plate are the same as those of the prior art. The back plate is formed by stamping and molding an iron-based metal plate with a press or the like, followed by degreasing, surface roughening, chemical conversion treatment, primer treatment and the like. Although not shown, a binding hole 1a (FIG. 3) may be formed as needed in correspondence with each back plate of the back plate assembly.

In the friction material assembly 12, the friction material to be bonded to the two back plates is arranged symmetrically with respect to the center line a, similarly to the back plate assembly.
It is bonded and fixed to the back plate by pressing and heating by pressing.

The adhesion between the friction material assembly 12 and the back plate 11 may be formed from a powdery material of the friction material or a temporary molded product, as described in the conventional example. . As described in the conventional example, it is possible to increase the binding force by forming the binding holes.

After the disk pad assembly 13 is formed in this way, it is cut at the center line a. Then, Figure 1
(C) As shown in (d), the back plate assembly 1
1 is divided into two back plates 11a, 11a,
At the same time, the friction material aggregate 12 also includes two friction materials 12a, 12a.
And two disk pads 13a, 13a are formed from one disk pad assembly 13. The cutting line is
Although the center line a is a straight line in this embodiment, the center line a may be a curved line. Thereafter, if necessary, the cut surface n is finished by polishing, chemical treatment for rust prevention, painting, or the like. Also, a groove may be provided in the portion of the friction material 12a, or the corner may be dropped to adjust the shape.

In the disk pad thus formed, since the cut surface n is the central portion of the back plate assembly 11 and not the peripheral portion, the conventional problem occurring in the peripheral portion is solved. In other words, because the density distribution of the friction material is uniform, chipping during use and uneven wear are reduced, and an automobile disk pad having stable friction performance can be obtained.

Further, the shape of the die used in the pressing step is simplified, and the die cost per disk pad can be reduced. Further, the number of times of measuring the friction material can be reduced, and the work of leveling the powdery friction material in the mold is centralized, thereby increasing the efficiency.

FIG. 2 is a view for explaining a second embodiment of the present invention. In this embodiment, six disk pads are integrally formed. That is, the back plate assembly 21
Is to attach six back plates 21a on both sides of the center line a.
The sheets are arranged line-symmetrically one by one and formed as an integrated one. The required amount of friction material is supplied to the six disk pads as a powder or as one temporary molded product. The friction material is attached to the back plate assembly 21 as an integrated friction material assembly 22, and the disk pad assembly 23 is provided. Becomes

Thereafter, six disk pads 23a cut along a center line a and cutting lines b and c and having a friction material 22a adhered to a back plate 21a as shown in FIG. It is completed. Also in this case, each cutting line can be a curve or the like.

According to this embodiment, each disk pad 2
3a is not a peripheral portion on both sides at the both ends, and 3 sides at the center. Therefore, chipping during use and uneven wear are further reduced as compared with the embodiment of FIG.
Stable friction performance.

Further, the die cost per disk pad can be further reduced, the number of times of weighing the friction material can be further reduced, and the work of leveling the powdery friction material in the mold has progressed, and the efficiency has been improved. Will be higher. In the embodiment, 6
The number can be similarly implemented if the number is an even number.

[0026]

According to the present invention as described above,
In the method for manufacturing a disc pad, instead of the back plate, an integrated back plate assembly in which an even number of back plates are arranged symmetrically on both sides of the center line is used. After forming the disk pad aggregate by fixing the material aggregate, the disk pad aggregate is cut to form a plurality of disk pads. Therefore, at least one side of the friction material of each disk pad is not a peripheral portion. Sides can be secured, and a disk pad with less chipping and uneven wear can be obtained.

Further, since the back plate assembly is used, the shape of the mold used in the pressing step is simplified,
Die cost per disk pad can be reduced. Furthermore, the number of times the friction material is weighed can be reduced, and the work of leveling the powdered friction material in the mold is centralized, increasing efficiency

[Brief description of the drawings]

FIG. 1 is a diagram illustrating a method for manufacturing a back plate according to the present invention.

FIG. 2 is a diagram illustrating another manufacturing method of the present invention.

FIG. 3 is a view showing a conventional back plate.

FIG. 4 is a view showing a temporarily formed product of a friction material.

FIG. 5 is a diagram showing a state in which a temporarily formed product is attached to a back plate.

FIG. 6 is a sectional view of the completed disk pad.

[Explanation of symbols]

 a Center line 11, 21 Back plate assembly 12, 22 Friction material assembly 13, 23 Disk pad assembly 13a, 23a Disk pad

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Shu Nagaya 1-1-18-1, Nishiarai Sakamachi, Adachi-ku, Tokyo Nisshin Spinning Co., Ltd. Tokyo Plant F-term (reference) 3J058 AA41 BA46 BA61 FA01 GA63 GA92

Claims (2)

[Claims] In a method for manufacturing a disk pad, a back plate and a raw material of a friction material are supplied between a plurality of molds, and the raw material of the friction material is compressed and heated to be fixed to the back plate. A disk pad assembly using an integrally formed back plate assembly in which an even number of back plates are arranged symmetrically on both sides of the center line, and fixing the integrally formed friction material assembly to the back plate assembly. Forming a plurality of disk pads by cutting the disk pad assembly after forming the disk pad. 2. The method for manufacturing a disk pad according to claim 1, wherein the back plate assembly has an integral shape in which two back plates are arranged in line symmetry.