JP2000240701A - Method for producing raw shoe and apparatus for producing the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an apparatus for manufacturing a raw shoe having a T-shaped cross section in which a rim and a web are integrally formed from a strip-shaped metal plate. SOLUTION: A rim which constitutes a brake shoe used for a drum brake of a vehicle or the like, and a lining material as a friction material is joined to an outer surface of an arc-shaped plate, and a web erected along the inner surface of the rim. And a T-shaped metal member 20 having a T-shaped cross section formed from a strip-shaped metal plate having the same thickness as the web, and having a T-shaped cross section. An apparatus for manufacturing a raw shoe to be formed, wherein one end of the T-shaped metal member 20 is gripped,
The rotating die 24 rotates in a direction in which the T-shaped metal member whose one end is gripped is wound, and the T-shaped metal member 20 is pressed against the flat surface of the T-shaped metal member 20 toward the surface of the rotating die 24. , A bending roller 26 that bends the T-shaped metal member 20 in an arc shape following the rim and the web.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a low shoe and an apparatus for manufacturing the same, and more particularly, to a brake shoe used for a drum brake of a vehicle or the like, and a lining material as a friction material on an outer surface of an arc-shaped plate. The present invention relates to a method for manufacturing a raw shoe having a T-shaped cross section, which is composed of a rim to which is joined, and a web erected along the inner surface of the rim.

[0002]

2. Description of the Related Art As shown in FIG. 7, a lining material 58 as a friction material is joined to the outer surface of a low shoe 56 in a brake shoe used for a drum brake of a vehicle or the like. The low shoe 56 has a T-shaped cross section, a rim 54 to which a lining material 58 is joined to the outer surface of the arc-shaped plate, and a web 5 standing upright along the inner surface of the rim 54.
2 Conventionally, the low shoe 56 is formed by joining a rim 54 and a web 52 separately formed into a predetermined shape by press working or the like by welding or the like. However, the joints joined by welding or the like may have reduced rigidity due to heating by welding heat or the like. Like this
A brake shoe using the low shoe 56 having a reduced joint rigidity may cause an unpleasant squealing phenomenon during a brake operation.

In order to prevent a decrease in rigidity of a joint due to such welding or the like, Japanese Utility Model Laid-Open No. 4-107532 discloses that a low shoe 56 can be formed from a strip-shaped metal plate having the same thickness as the web 52 without performing welding or the like. Manufacturing methods have been proposed. In this manufacturing method, as shown in FIG. 8, after forming a slit 62 in the longitudinal direction of a strip-shaped metal plate 60 having the same thickness as the web 52, as shown in FIG. 64a, 64a are opened on both sides, and the cross-sectional shape is T-shaped. In the T-shaped metal member having a T-shaped cross section, a flat portion having a substantially flat surface is a flat portion 54a serving as a rim 54 of the low shoe 56, and the back surface of the flat portion 54a is erected. Standing part 52
a is a portion of the raw shoe 56 to be the web 52.
Next, if necessary, the flat surface of the flat portion 54a is subjected to press working or the like, and then the T-shaped metal member is bent into an arc shape by roll processing or the like, whereby the low shoe 56 can be obtained. As shown in FIG. 10, a lining material 58 is joined to the outer surface of the arc-shaped rim 54 of the obtained low shoe 56 to obtain a brake shoe.

[0004]

According to the method of manufacturing the low shoe 56 described in the above-mentioned publication, the strip-shaped metal plate 60 is provided.
Since the rim 54 and the web 52 are integrally formed, welding or the like for joining the rim 54 and the web 52 can be eliminated. However, the slit 62 is not
Need to be formed in parallel with both sides of the two, and open the divided portions 64a, 64a divided by the narrow slit 62 on both sides,
It was extremely difficult to form a T-shaped cross section. Therefore, an object of the present invention is to provide a method of manufacturing a low shoe having a T-shaped cross section in which a rim and a web are integrally formed from a strip-shaped metal plate, and an apparatus for manufacturing the same.

[0005]

As a result of studying to solve the above-mentioned problems, the present inventor has found that the T-shaped metal member is formed by pushing open and flattening the inclined wall surface of the V-shaped groove of the Y-shaped metal member. And that the low shoe can be easily formed by bending the T-shaped metal member so that the flat portion of the formed T-shaped metal member is formed on the rim to which the lining is joined. Reached the present invention. That is, the present invention constitutes a brake shoe used for a drum brake of a vehicle or the like, and is erected along a rim to which a lining material as a friction material is joined to an outer surface of an arc-shaped plate, and along an inner surface of the rim. When manufacturing a raw shoe having a T-shaped cross section, the strip-shaped metal plate having the same thickness as the web is formed into a Y-shape when manufacturing the raw shoe. After cutting out the thickness surface along the longitudinal direction of, and forming a V-shaped groove in the thickness surface,
The inclined wall portion forming the V-shaped groove is pushed open to form a T-shaped metal member having a T-shaped cross section, and then a flat portion of the T-shaped metal member is formed on a rim to which the lining is joined. As described above, there is provided a method for manufacturing a raw shoe, wherein the T-shaped metal member is bent.

Further, the present invention provides a brake shoe used for a drum brake of a vehicle or the like, a rim having a lining material as a friction material joined to an outer surface of an arcuate plate, and an upright along an inner surface of the rim. An apparatus for manufacturing a low shoe, comprising a web provided and having a T-shaped cross section formed from a strip metal plate having the same thickness as the web, wherein the strip metal has the same thickness as the web. A cutting blade for forming a V-shaped groove in a thickness surface along a longitudinal direction of the band-shaped metal plate so as to form a Y-shaped cross-sectional shape, and pushing open the inclined wall portion of the V-shaped groove to cross the plate. An apparatus for manufacturing a raw shoe, comprising: a pressing roller for forming a T-shaped metal member having a T-shaped surface; and a bending device for bending the T-shaped metal member in an arc shape following the rim and the web. It is in.

Further, the present invention constitutes a brake shoe used for a drum brake of a vehicle or the like, a rim having a lining material as a friction material joined to an outer surface of an arcuate plate, and an upright standing along an inner surface of the rim. A T-shaped metal member having a T-shaped cross section, wherein a low shoe having a T-shaped cross section is formed from a strip-shaped metal plate having the same thickness as the web. And a rotary die that grips one end of the T-shaped metal member and rotates in a direction in which the T-shaped metal member gripped at the one end is wound. A bending roller that abuts against the flat surface of the T-shaped metal member to press the T-shaped metal member toward the surface of the rotary mold, and that bends the T-shaped metal member in an arc shape following the rim and the web. Low shoe manufacturing equipment But there is.

According to the present invention, Y having a Y-shaped cross section is used.
As shown in FIGS. 8 and 9, the divided portion 6 divided by the narrow slit 62 to push open and flatten the inclined wall surface of the V-shaped groove formed in the V-shaped metal member to form a T-shaped metal member.
As compared with the case where the T-shaped metal member is formed by pushing and opening the 4a and 64a to both sides, the T-shaped metal member can be easily formed. As a result, the low shoe which integrates the web and the rim without welding or the like can be easily formed. Can be obtained. In the present invention, a rotary type that grips one end of the T-shaped metal member and rotates in a direction in which the T-shaped metal member is wound, and a rotary type that contacts the flat surface of the T-shaped metal member and rotates the T-shaped metal member. By bending the T-shaped metal member in an arc shape following the rim and the web by pressing in the surface direction of the T-shaped metal member, thereby following the rim and web of the raw shoe forming the T-shaped metal member Can be bent easily.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In the present invention, first, a V-shaped groove is formed in a thick surface along a longitudinal direction of a strip-shaped metal plate having the same thickness as a web 52 (FIG. 7) of a low shoe 56 to be formed.
A Y-shaped metal member having a Y-shaped cross section is formed. Such a Y-shaped metal member can be obtained by the cutting blade 10 shown in FIGS. Cutting blade 10 shown in FIGS. 1 and 2
Cuts through the thickness surface of the band-shaped metal plate 12 having a rectangular cross-section that moves in the direction of arrow B while rotating in the direction of arrow A, and forms a V-shaped groove 14 along the longitudinal direction of the band-shaped metal plate 12. The incision blade 10 cuts the thickness surface as if a wedge was driven into the thickness surface of the strip-shaped metal plate 12 without substantially shaving the thickness surface, thereby forming a V-shaped groove 14. For this reason, the inclined wall surface of the V-shaped groove 14 is
As a result, the Y-shaped metal member 16 having a Y-shaped cross section can be formed by being pushed and spread on both sides of the band-shaped metal plate 12.

The obtained Y-shaped metal member 16 is flattened by pushing open the inclined wall surface of the V-shaped groove 14 to form a T-shaped metal member having a T-shaped cross section. As shown in FIG. 3, the T-shaped metal member is formed by moving the inclined wall surface of the V-shaped groove 14 formed in the Y-shaped metal member 16 moving in the direction of arrow C by the arrow D.
It can be obtained by pushing open by a pressing roller 18 rotating in a direction to form a flat surface. By the way, the flat portion 54a of the obtained T-shaped metal member 20 (FIG. 9)
Is not necessarily equal to the rim 54 of the final shoe 56 (FIG. 7). For example, web 5
In the case where it is necessary to use a strip-shaped metal plate 10 thicker than twice the thickness of the rim 54 to be formed in relation to the strength of the rim 54, the thickness of the flat portion 54a of the obtained T-shaped metal member is reduced by the rim 54. It has to be thicker than that. In this case, as shown in FIG. 4, the inclined wall portion of the V-shaped groove 14 is pushed open by the pressing roller 18 to form a flat surface, and the flat surface of the T-shaped metal member 20 placed on the upper surface of the receiving base 22 is formed. By rolling the portion 54 a with the pressing roller 18, the thickness of the flat portion 54 a of the T-shaped metal member 20 can be made equal to the rim 54 of the raw shoe 56. For this reason, the degree of freedom in manufacturing the raw shoe can be improved.

The T-shaped metal member 20 thus formed
Is a straight T-shaped metal member 20, so that the T-shaped metal member 20 is bent so that a flat portion of the T-shaped metal member 20 is formed on the rim 54 to which the lining as a friction material is joined. . As shown in FIG. 5, the bending device that bends the T-shaped metal member 20 grips the upright portion 52a at one end of the T-shaped metal member 20 and grips the upright portion 52a at one end. The rotating die 24 that rotates in the direction in which the T-shaped metal member 20 is wound, and the T-shaped metal member 20 abuts against the flat surface of the T-shaped metal member 20 and presses the T-shaped metal member 20 toward the surface of the rotating die 24. And a bending roller 26 that bends in an arc following the rim 54 and the web 52. This rotary mold 24 is
It is composed of a fixed mold 28 that is rotated in the direction of arrow E by a drive motor (not shown), and a movable mold 30 that is vertically movable. The fixed mold 28 is provided with a protruding portion 32 protruding from an upper end surface thereof, and the movable mold 30 is formed with a concave portion 34 into which the protruding portion 32 of the fixed mold 28 is inserted. For this reason, the movable mold 30 has
Is inserted into the protrusion 32 of the fixed mold 28 and guided,
The movable mold 30 can approach the fixed mold 28.

In the rotary mold 24, the fixed mold 28 and the movable mold 30 are close to each other, and the T-shaped metal member 2 is provided between the end faces 35 of both molds.
The upright portion 52a at one end of the “0” is gripped. In this grip,
One end of the T-shaped metal member 20 is fixed with a bolt or the like.
8 or the end surface of the movable mold 30 may be securely held. In this manner, the erected portion 52a at one end of the T-shaped metal member 20 is held between the fixed mold 28 and the movable mold 30 by the T
The metal character member 20 is wound in with the rotation of the rotary mold 24. The outer surface of the flat portion 54a of the T-shaped metal member 20 is pressed by the bending roller 26 so that the inner surface of the flat portion 54a contacts the surface of the rotary mold 24, and the T-shaped metal member 2
0 is bent in an arc following the rim 54 and the web 52. At this time, the standing portion 52a of the bent T-shaped metal member 20
Is pushed between the end faces 35 of both molds. In addition, fixed type 28
Standing portion 52a of the T-shaped metal member 20 by means of the movable die 30
Can be released by raising the movable mold 30 to the position 30 'as shown in FIG.

FIG. 6 shows a state of the rotary mold 24 shown in FIG. 5 on the fixed mold 28 side. FIG. 6 shows the rotary mold 2 of the T-shaped metal member 20.
4 shows a state in which the portion that is involved in the rotation in the direction of arrow E of FIG. 4 is pressed and bent by the bending roller 26. When the T-shaped metal member 20 is pressed by the bending roller 26, the linear portion of the T-shaped metal member 20 that is not caught in the rotary mold 24 is separated from the peripheral surface of the rotary mold 24 (the peripheral surface of the rotary mold 24). In the direction of rising from In order to prevent such a rise of the T-shaped metal member 20, the sub-roller 36 is brought into contact with a linear portion of the T-shaped metal member 20 that is not caught in the rotary mold 24. Therefore, when the T-shaped metal member 20 is bent, an excessive load is applied to the bending roller 26, the rotary die 24, and the like due to the lifting of the T-shaped metal member 20 from the peripheral surface of the rotary mold 24. And the dimensional accuracy of the outer radius of the raw shoe can be improved. The bending roller 26 and the sub-roller 36 are provided on a common base 38, and the base 38
Is provided so as to be movable toward and away from the rotary mold 24 by a hydraulic cylinder device (not shown) as a drive source.
For this reason, as shown in FIG. 6, the pressing force of the bending roller 26 against the T-shaped metal member 20 can be adjusted by the degree to which the base 38 is brought close to the rotary mold 24. On the other hand, three bases 38
8 'to bend roller 2
6 and the sub-roller 36 are separated from the T-shaped metal member 20 by 2
6 'and 36' positions.

The pressing force of the bending roller 26 is received by the rotary mold 24. For this reason, the bending roller 26
The auxiliary roller 40 is opposed to the pressing rotor 26 to support the rotary mold 24 receiving the pressing force from one direction.
a and 40b are provided. This auxiliary roller 40a,
The base 40b is also provided on a common base 42 for both rollers, and the base 42 is provided so as to be able to move toward and away from the rotary mold 24 by a hydraulic cylinder device (not shown) as a drive source. . For this reason, as shown in FIG. 6, the base 42 is brought close to the rotary mold 24, and the rotary mold 24 pressed by the bending roller 26 and the auxiliary rollers 40a, 40b are brought into contact with each other to support the rotary mold 24. be able to. In addition, the pressing force of the bending roller 26 against the rotary mold 24 depends on the proximity of the base 42 to the rotary mold 24 and the auxiliary roller 40.
The bearing force of the a and 40b on the rotary mold 24 can be adjusted.
On the other hand, by moving the base 42 to the position 42 ', the auxiliary rollers 40a and 40b can be set to the positions 40a' and 40b 'apart from the rotary mold 24.

When the straight T-shaped metal member 20 is bent by the bending device shown in FIGS. 5 and 6, a tensile force acts on the flat portion 54a of the T-shaped metal member 20, and the T-shaped metal member 20 is bent. Although a contraction force acts on the upright portion 52a of the member 20, wrinkles and the like due to bending were not found in the obtained bent member. For this reason, the obtained bent member is immediately cut into an appropriate length so that the low shoe 56
Can be obtained. The obtained low shoe 56 is subjected to the same surface treatment as that for the normal low shoe, and then the lining material 58 is joined to the outer surface of the flat portion 54a to obtain the brake shoe shown in FIG. it can.

[0016]

According to the present invention, the thickness surface is cut open along the longitudinal direction of the strip-shaped metal plate, a V-shaped groove is formed in the thickness surface, and the inclined wall surface forming the V-shaped groove is pushed open to open. A T-shaped metal member having a T-shaped cross section is formed. For this reason,
The T-shaped metal member can be easily formed as compared with the case where the divided portion divided by the narrow slit is pushed open to both sides to form the T-shaped metal member, and the web and the rim are integrated without welding or the like. Can be easily obtained.
The brake shoe formed by using the low shoe thus obtained is integrated with the web and the rim without welding or the like, so that the joint between the web and the rim is formed like a conventional brake shoe. It is possible to prevent an unpleasant squealing phenomenon at the time of a brake operation, which has been caused by a decrease in rigidity. Further, in the case where the pressing roller is a pressing / rolling roller that pushes open the inclined wall surface portion of the V-shaped groove to form a T-shaped metal member and that rolls the flat portion of the T-shaped metal member to have a predetermined thickness. Since the rolling can be performed while pushing open the inclined wall surface of the V-shaped groove so that the flat portion of the raw shoe has a predetermined thickness, the production freedom of the raw shoe can be improved.
Further, when the T-shaped metal member is bent in an arc shape, a sub-roller for preventing the T-shaped metal member from floating from the rotating peripheral surface is provided. It is possible to prevent an excessive load from being applied to the bending roller and the rotary mold due to the lifting of the member from the peripheral surface of the rotary mold, and to improve the dimensional accuracy of the outer radius of the low shoe.

[Brief description of the drawings]

FIG. 1 is a partial cross-sectional view for explaining a step of forming a Y-shaped metal member having a Y-shaped cross section.

FIG. 2 is a partial cross-sectional view illustrating a cutting blade forming a Y-shaped metal member.

FIG. 3 is a partial front view for explaining a step of forming a T-shaped metal member having a T-shaped cross section.

FIG. 4 is a partial sectional view illustrating a pressing roller forming a T-shaped metal member.

FIG. 5 is a partial sectional view for explaining a rotary mold.

FIG. 6 is a partial front view for explaining a rotary type structure.

FIG. 7 is a front view for explaining a brake shoe.

FIG. 8 is a perspective view for explaining a part of the conventional low shoe manufacturing process.

FIG. 9 is a cross-sectional view of a T-shaped metal member for explaining a part of a conventional low shoe manufacturing process.

FIG. 10 is a transverse sectional view of a brake shoe obtained by a conventional low shoe manufacturing method.

[Explanation of symbols]

 REFERENCE SIGNS LIST 10 cutting blade 12 band-shaped metal plate 14 V-shaped groove 16 Y-shaped metal member 18 pressing roller 20 T-shaped metal member 22 cradle 24 rotary type 26 bending roller 28 fixed type 30 movable type 32 projecting portion 34 concave portion 36 sub-roller 38, 42 base Table 40a, 40b Auxiliary roller 52 Web 54 Rim 56 Low shoe

Claims (8)

[Claims] 1. A rim comprising a brake shoe used for a drum brake of a vehicle or the like, wherein a lining material as a friction material is joined to an outer surface of an arc-shaped plate, and a web erected along the inner surface of the rim. When manufacturing a low shoe having a T-shaped cross section, the strip metal plate having the same thickness as the web is formed into a Y shape so that the cross section of the strip metal plate is formed in a Y shape. A thick surface is cut open along the longitudinal direction, a V-shaped groove is formed in the thick surface, and an inclined wall portion forming the V-shaped groove is pushed open to form a T-shaped metal member having a T-shaped cross section. Then, the T-shaped metal member is bent so that a flat portion of the T-shaped metal member is formed on a rim to which the lining is joined. 2. The method according to claim 1, wherein the inclined wall surface of the V-shaped groove is pushed open so as to form a flat portion of the T-shaped metal member having a predetermined thickness. The method for producing a raw shoe according to claim 1, wherein the flat portion is rolled. 3. The bending of the T-shaped metal member may be performed by gripping one end of the T-shaped metal member and holding the one end of the T-shaped metal member.
A rotary mold that rotates in the direction of winding the metal member,
A bending roller comprising: a bending roller that abuts against a flat surface of the T-shaped metal member and presses the T-shaped metal member toward the surface of the rotary mold to bend the T-shaped metal member in an arc shape following the rim and the web. The method for producing a raw shoe according to claim 1, wherein the method is performed using the raw shoe. 4. A rim for forming a brake shoe used for a drum brake of a vehicle or the like, wherein a lining material as a friction material is joined to an outer surface of an arc-shaped plate, and a web erected along the inner surface of the rim. A raw shoe having a T-shaped cross section formed from a strip-shaped metal plate having the same thickness as the web, wherein the cross-section of the strip-shaped metal plate having the same thickness as the web is formed. An incision blade for forming a V-shaped groove in the thickness surface along the longitudinal direction of the strip-shaped metal plate so that the shape becomes a Y-shape; An apparatus for manufacturing a low shoe, comprising: a pressing roller that forms a T-shaped metal member having a letter shape; and a bending device that bends the T-shaped metal member in an arc shape following the rim and the web. 5. A pressing / rolling roller which presses and opens a sloped wall portion of a V-shaped groove to form a T-shaped metal member and rolls the flat portion of the T-shaped metal member so as to have a predetermined thickness. The raw shoe manufacturing apparatus according to claim 4, wherein 6. A rotating device for bending a T-shaped metal member, wherein the bending device grips one end of the T-shaped metal member and rotates in a direction in which the T-shaped metal member gripped at the one end is wound. A bending roller that contacts the flat surface of the T-shaped metal member to press the T-shaped metal member toward the surface of the rotary mold, and that bends the T-shaped metal member in an arc shape following the rim and the web. An apparatus for producing a raw shoe according to claim 4 or claim 5. 7. A rim that constitutes a brake shoe used for a drum brake of a vehicle or the like, and a rim in which a lining material as a friction material is joined to an outer surface of an arc-shaped plate, and a web erected along the inner surface of the rim. And a cross-sectional T-shaped low shoe formed from a band-shaped metal plate having the same thickness as the web, and a T-shaped metal member having a linear and T-shaped cross section bent. An apparatus for manufacturing a raw shoe to be formed, comprising: a rotary mold that grips one end of the T-shaped metal member and rotates in a direction in which the T-shaped metal member gripped at the one end is wound. The low shoe according to claim 1, further comprising a bending roller that abuts against the flat surface to press the T-shaped metal member toward the surface of the rotary mold, and that bends the T-shaped metal member in an arc shape following the rim and the web. manufacturing device. 8. A sub-roller for preventing the T-shaped metal member from rising from the peripheral surface of the rotary mold when the T-shaped metal member is bent in an arc shape.
An apparatus for producing the raw shoe according to the above.