JP4764092B2 - Method for manufacturing arc brake shoe - Google Patents

Description

  The present invention relates to a method for manufacturing a brake shoe used for braking automobiles, various industrial machines, and the like, and more particularly to a method for manufacturing an arc brake shoe.

For example, brake shoes are used for braking automobiles, various industrial machines, and the like.
As shown in Patent Document 1, the conventional brake shoe has a groove in the outer circumferential portion of a metal blank on a circular plate having a groove width larger than the thickness of the blank on the outer circumferential surface in the circumferential direction. And pressing the concave groove and the groove forming blade portion of a pre-rolling roller die formed by projecting a groove forming blade portion in the circumferential direction on the inner bottom portion of the concave groove, A pre-molding step in which an outer peripheral groove is provided by the groove forming blade portion on the entire outer periphery, and an expansion molding formed by projecting an expanding blade portion on the outer peripheral surface of the blank in the circumferential direction of the blank. Of the roller die for expansion, expanding the outer peripheral portion of the blank while dividing the outer peripheral portion of the blank into two in the plate thickness direction, and forming a rim on the outer periphery of the web and the web Partial circle by cutting the process and the web and rim into the required shape And Jo of the shoe rim, the brake shoe and a step of forming a brake shoe having a Shuribu which projects from the inner periphery of the shoe rim is known.

Japanese Patent No. 3330363

  However, when manufacturing a brake shoe by the method shown above, a blank (friction member support) is produced by punching out the material (metal plate) to be used, which ultimately depends on the size of the brake shoe. About 70% of the material is discarded, which is uneconomical and the resulting brake shoe is expensive.

  In order to eliminate the above-mentioned drawbacks, the present inventors, as shown in Patent Documents 2 and 3, after bending a strip-shaped metal plate into a V-shape in the longitudinal direction at a substantially central portion of its width. The part between the upper end and the lower end of the left and right side surfaces of the V-shaped metal plate is folded back outward in the length direction, and then pressed by applying pressure from the outer side to the inner side of the V-shaped part. Processed into a T-shape having a protruding portion, and further processed into a ring shape or an arc shape so that the protruding portion is inside, and then a friction member is fixed to the flat portion of the ring-shaped or arc-shaped outer surface or integrated. A method of manufacturing a brake shoe by molding was devised.

Japanese Patent Application No. 2005-177869 Japanese Patent Application No. 2005-180512

  However, in the method shown above, when processing from a V-shape to a T-shape, if the pressure contact force is too weak, the center portion (the apex portion of the joint) of the top surface of the T-shape is curved as shown in FIG. (R) remains and cannot be completely adhered, resulting in a gap. In some cases, the upper part (the flat part side) of the protruding part must be welded entirely or partially. For this reason, a new problem of taking time and effort has arisen.

  The present invention provides a method for manufacturing an arc-shaped brake shoe that is economical and inexpensive with a simple operation, in which the material to be disposed of is reduced as much as possible, and there is no gap at the center of the T-shaped upper surface. .

  In the present invention, a short block-shaped metal A having a dimension capable of obtaining a single arc-shaped brake shoe is processed into a T-shape having a flat portion and a protruding portion perpendicular thereto by a hot rolling method. An arc shape characterized in that an arc-shaped metal processed product is obtained by processing into an arc shape so that the portion is inside, and then a friction member is fixed or integrally formed on a flat portion of the outer surface of the arc-shaped metal processed product The present invention relates to a method for manufacturing a brake shoe.

  Further, the present invention processes a short block-shaped metal B having a dimension capable of obtaining a single ring-shaped metal workpiece into a T-shape having a flat portion and a protruding portion perpendicular thereto by a hot rolling method. Further, after processing into a ring shape so that the protruding portion is on the inside, it is cut at a portion where an arc-shaped brake shoe of the required size can be formed to obtain several arc-shaped metal workpieces, and then each The present invention relates to a method for manufacturing an arc-shaped brake shoe, characterized in that a friction member is fixed to or integrally molded with a flat portion on the outer surface of the arc-shaped metal workpiece.

  Further, the present invention processes a long block metal having a dimension capable of obtaining a plurality of arc-shaped brake shoes into a T shape having a flat portion and a protruding portion perpendicular thereto by a hot rolling method. Is cut at a portion where an arc-shaped brake shoe having a required size can be formed to obtain a plurality of divided T-shaped metal workpieces, and the protruding portion is on the inside of each divided T-shaped metal workpiece. The arc-shaped brake shoe manufacturing method is characterized in that an arc-shaped metal workpiece is obtained by machining into an arc shape, and then a friction member is fixed or integrally formed on a flat portion of the outer surface of the arc-shaped metal workpiece. About.

  Further, the present invention processes a long block-shaped metal having a dimension capable of obtaining a plurality of arc-shaped brake shoes into a T shape having a flat portion and a protruding portion perpendicular thereto by a hot rolling method. After the T-shaped processed product is processed into a continuous spiral shape so that the protruding part is on the inside, it is cut at the part where an arc brake shoe of the required size can be formed, and the left and right cut surfaces are displaced. A plurality of divided arc-shaped metal workpieces are obtained, and then each divided arc-shaped metal workpiece is processed into an arc shape in which the upper and lower surfaces are parallel by correcting the left and right deviations in the individual cut surfaces. The present invention relates to a method of manufacturing an arc-shaped brake shoe, in which a friction member is fixed to a flat portion of an outer surface of an arc-shaped metal workpiece or is integrally formed.

  The arc-shaped brake shoe obtained by the method of the present invention can reduce the material to be disposed of as much as possible, and can be manufactured by a simple operation without generating a gap at the center of the T-shaped upper surface. It is an economical and inexpensive arc-shaped brake shoe, which is extremely suitable industrially.

  The arc-shaped brake shoes manufactured according to the present invention may be manufactured one by one using a short block-shaped metal A having a dimension capable of obtaining a single arc-shaped brake shoe. In addition, a short block-shaped metal B having a dimension capable of obtaining a ring-shaped metal workpiece may be formed into a ring shape, and then divided into two or three arc-shaped brake shoes. Further, a large number of pieces (four or more) are cut by a portion where a single arc-shaped brake shoe having a required size is obtained by using a long block-shaped metal having a dimension capable of obtaining plural arc-shaped brake shoes. Many arc-shaped brake shoes, that is, a single arc-shaped brake shoe may be manufactured from one metal block.

  In the present invention, the short block-shaped metal A refers to a metal having such a dimension that one arc-shaped brake shoe can be obtained, and the short block-shaped metal B refers to a ring-shaped metal processed product. Is a metal having such a dimension that two or three arc-shaped brake shoes can be obtained by dividing.

In the case of using the short block-shaped metal A, it is preferable to use a metal having the same length as that for obtaining a single arc-shaped brake shoe in advance, because it is not necessary to adjust to a specified dimension later.
In addition, when using a short block-shaped metal B, a metal having the same length as that obtained by accurately dividing a ring-shaped metal workpiece to obtain two or three arc-shaped brake shoes having an arc shape is used. In the same manner as described above, it is not necessary to adjust to the specified dimensions later, which is preferable.

  When manufacturing a plurality of arc-shaped brake shoes using a long block-shaped metal, after processing the long block-shaped metal into a T shape having a flat portion and a protruding portion perpendicular thereto by a hot rolling method. T-shaped having a flat part and a protruding part perpendicular to it by manufacturing a plurality of arc-shaped brake shoes using a part cut at a part where an arc-shaped brake shoe of a required size can be formed After processing into a shape, after processing into a continuous spiral shape so that the protruding portion of the T-shaped processed product is on the inside, cut at a portion where an arc-shaped brake shoe of the required size can be formed, Obtain a plurality of divided arc-shaped metal workpieces with slight deviations on the left and right cut surfaces, and then correct the left and right deviations on the individual cut surfaces for each divided arc-shaped metal workpiece. It is possible to produce a large number of arc-shaped brake shoes are processed into line arcuate.

  The material of the short block metal A or B or the long block metal used in the present invention is not particularly limited as long as it is a ductile metal such as steel, aluminum, or a brass plate. Is preferably used.

  In the present invention, when a short block metal A, B or a long block metal is processed into a T-shape, it is processed by a hot rolling method. It is used to process by moving between the rolls while heating and pressurizing the block metal, and as shown below, as an example of the processing method, a method of processing by performing hot rolling twice is there. In this method, first, as the first hot rolling, one of the rolls has a flat pressed portion and the other uses a roll having a depression in the circumferential direction in the central portion. The block-shaped metal is moved under known heating and pressurizing conditions, and a circular protrusion is formed at the central portion on one side of the block-shaped metal.

  Next, the second hot rolling is performed. In this method, one roll uses a roll provided with a recess for forming a T-shaped flat portion in the circumferential direction, and the other roll uses the roll. Each used a roll provided with a recess for forming a projecting portion perpendicular to the flat part in the circumferential direction, and the above-mentioned obtained between the rolls under generally known heating and pressing conditions. By moving the block-shaped metal having the protrusion formed on the central portion on one side, a T-shaped metal workpiece having a flat portion and a protruding portion perpendicular to the flat portion can be obtained.

The flat portion in the T-shaped metal workpiece obtained above corresponds to the rim of the obtained brake shoe, and the protruding portion perpendicular to the flat portion corresponds to the shoe web of the brake shoe. .
After processing into a T-shape, processing is performed in an arc shape so that the protruding portion is on the inside, but roll processing is optimal for this processing method, but it is not necessarily limited to this method.

As a material of the friction member fixed to the flat portion of the arc-shaped metal plate obtained as described above, generally known materials are used, for example, steel fiber, brass fiber, copper fiber, aramid fiber, acrylic fiber, phenol fiber. Binders containing fibrous materials such as ceramic fibers, rock wool, potassium titanate fibers, carbon fibers, thermosetting resins such as phenol resins, epoxy resins, melamine resins, cashew resins, and rubber components such as NBR, SBR, Organic friction modifiers such as friction dust, inorganic friction modifiers such as barium sulfate, graphite, and antimony trisulfide are used.
In addition to the above materials, metal powder such as brass and copper is added as necessary.
The blending ratio of the material of the friction member varies depending on the friction characteristics and is appropriately determined, and is not particularly limited.

  The friction member can be attached to the flat portion of the outer surface of the arc-shaped metal workpiece by a fixing method or a method of integral molding. Among these, the fixing method can be fixed by, for example, riveting or adhesive. it can. In the case of bonding, in order to increase the bonding strength of the friction member, it is preferable that the outer periphery of the arc-shaped metal workpiece is processed such as knurling before bonding the friction member.

Embodiments of the present invention will be described below with reference to the drawings.
FIGS. 1 to 6 are views showing a manufacturing process of an arc brake shoe according to an embodiment of the present invention. Of these, FIG. 1 is a short block shape having a dimension capable of obtaining a single arc brake shoe. FIG. 2 is a partially omitted front view showing the first hot rolling method, FIG. 3 is a partially omitted perspective view showing the second hot rolling method, and FIG. 4 is a flat portion and perpendicular thereto. FIG. 5 is a plan view of an arc-shaped steel processed product processed so that the protruding portion of the T-shaped steel processed product shown in FIG. 6 is a plan view of an arc-shaped brake shoe according to the present invention in which a friction member is bonded to a flat portion on the outer surface of the arc-shaped steel workpiece.

FIG. 7 shows an example of a method of manufacturing an arc brake shoe according to another embodiment of the present invention. The ring-shaped steel processed into a ring shape so that the protruding portion of the T-shaped steel processed product is inside. It is a perspective view of a processed product.
8 to 10 are diagrams showing a manufacturing process of an arc-shaped brake shoe according to another embodiment of the present invention, in which FIG. 8 is continuous so that the protruding portion of the T-shaped steel processed product is inside. FIG. 9 is a front view of a split arc-shaped steel processed product obtained by cutting the spiral steel processed product shown in FIG. 8, and FIG. 10 is a split arc-shaped steel processed product shown in FIG. It is a front view of the single circular-arc-shaped steel processed goods which correct | amended right and left deviation of.
FIG. 11 is a front view of a conventional T-shaped processed product.

Example 1
As shown in FIG. 1, a short block-shaped steel A1 is prepared, and a lower roll 2 having a flat pressing portion shown in FIG. 2 and an upper roll 4 provided with a depression 3 in the circumferential direction of the central portion are used. The block-shaped steel A1 was moved (first hot rolling) while rotating the roll and heating and pressurizing between the rolls to form a protrusion 5 at the center of one side of the block-shaped steel A1.

  Next, in order to make the block-shaped steel A1 having the protrusion 5 formed in the central portion on one side into a T shape, as shown in FIG. 3, a recess 6 for forming a portion that becomes a T-shaped flat portion in the circumferential direction. Using the lower roll 7 provided and the upper roll 9 provided with a recess 8 for forming a projecting portion perpendicular to the flat part, these rolls are rotated, and the blocks are heated and pressed between the rolls. The steel A1 is moved (second hot rolling), and the dimensions shown in FIG. 4 are 300 mm in length (length), 45 mm in width (width), 3 mm in thickness of the flat portion, and 9 mm in height of the protruding portion. A T-shaped steel workpiece 12 having 10 and a protruding portion 11 was produced.

  Next, as shown in FIG. 5, an arcuate steel processed product 13 was obtained by rolling so that the protruding portion 11 of the T-shaped steel processed product 12 obtained in FIG. Thereafter, the end portion of the projecting portion 11 is processed with dimensional accuracy, and as shown in FIG. 6, a fibrous material, a binder, an organic friction modifier, The friction member 14 obtained by mixing and molding an inorganic friction modifier or the like was bonded to obtain an arc brake shoe.

Example 2
A short block-shaped steel B was prepared, and after the same steps as in Example 1, a T-shaped steel having a length (length) of 900 mm having a flat portion similar to that in Example 1 and a protruding portion perpendicular thereto. A processed product was produced.
Next, as in Example 1, a ring-shaped steel processed product 16 having a notch 15 in a part as shown in FIG. 7 by rolling so that the protruding portion of the T-shaped steel processed product is inside. Was made.

  Thereafter, the ring-shaped steel processed product 16 obtained above was divided into three equal parts to obtain three arc-shaped steel processed products having the same shape as in Example 1. Thereafter, through the same process as in Example 1, a friction member was bonded to the flat portion of the outer surface of the arcuate steel processed product to obtain an arcuate brake shoe.

Example 3
A long block steel plate (not shown) was prepared, and a T-shaped steel processed product having a vertical portion (length) of 2700 mm and a protruding portion was produced through the same steps as in Example 1 below. .
Thereafter, the T-shaped steel processed product obtained above was cut into a length (length) of 300 mm so as to be divided into nine equal parts, and nine divided T-shaped steel processed products were produced.

Next, it rolled so that the protrusion part of each division | segmentation T-shaped steel processed goods might become inside, and the arc-shaped steel processed goods similar to Example 1 were obtained.
Thereafter, a friction member was bonded to the flat portion of the outer surface of the arcuate steel processed product through the same steps as in Example 1 to obtain an arcuate brake shoe.

Example 4
A long block-shaped steel (not shown) was prepared, and a T-shaped steel processed product having a flat portion (length) of 2700 mm and a protruding portion was produced through the same process as in Example 1 below.
Thereafter, a continuous spiral steel processed product 17 shown in FIG. 8 was produced by rolling the T-shaped steel processed product obtained above.

Next, the spiral steel processed product 17 obtained above is cut at a portion that is divided into nine equal parts with respect to the length direction, and there is a slight misalignment 18 on the left and right cut surfaces shown in FIG. 9) Nine divided arc-shaped steel products 19 were obtained. Next, the left and right height deviations 18 of each of the divided arc-shaped steel processed products 19 are corrected to obtain a single arc-shaped steel processed product 20 whose upper and lower surfaces are parallel to each other in the shape shown in FIG. Produced.
Thereafter, the friction member was bonded to the flat portion 10 on the outer surface of the single arc-shaped steel processed product 20 through the same process as in Example 1 to obtain an arc-shaped brake shoe.

It is a perspective view of the short block-shaped steel A of the dimension from which a single arc-shaped brake shoe is obtained. It is a partially omitted front view showing a first hot rolling method. It is a partially omitted perspective view showing a second hot rolling method. It is a perspective view of the T-shaped steel processed product which formed the flat part and the protrusion part perpendicular | vertical to it. It is a top view of the circular-arc-shaped steel processed goods processed so that the protrusion part of the T-shaped steel processed goods shown in FIG. 4 might become inside. It is a top view of the arc-shaped brake shoe which becomes this invention which adhered the friction member to the flat part of the outer surface of an arc-shaped steel processed goods.

It is a perspective view of the ring-shaped steel processed goods processed into the ring shape so that the protrusion part of a T-shaped steel processed goods may become inside. It is a top view of the spiral steel processed product which processed continuously so that the protrusion part of a T-shaped steel processed product might become inside. It is a front view of the division | segmentation arc-shaped steel processed goods which cut | disconnected the spiral steel processed goods shown in FIG. FIG. 10 is a front view of a single arc-shaped steel processed product in which the left and right misalignment of the divided arc-shaped steel processed product illustrated in FIG. 9 is corrected. It is a front view of the conventional T-shaped processed product.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Block-shaped steel 2 Lower roll 3 Indentation 4 Upper roll 5 Protrusion 6 Indentation 7 Lower roll 8 Indentation 9 Upper roll 10 Flat part 11 Protruding part 12 T-shaped steel processed product 13 Arc-shaped steel processed product 14 Friction member 15 Notch 16 Ring-shaped steel processed product 17 Spiral-shaped steel processed product 18 Deviation 19 Divided arc-shaped steel processed product 20 Single arc-shaped steel processed product

Claims (4)

Rotate these short blocks of metal A with dimensions that can produce a single arc-shaped brake shoe, using a lower roll with a flat pressing part and an upper roll with a depression in the circumferential direction at the center. And the block-shaped metal A is moved (first hot rolling) while heating and pressurizing between the rolls to form a protrusion on one side central portion of the block-shaped metal A, and then a protrusion is formed on the one-side central portion. The formed block-shaped metal A has a lower roll provided with a recess for forming a portion that becomes a T-shaped flat portion in the circumferential direction, and a recess for forming a protruding portion perpendicular to the flat portion. Using the provided upper rolls, these rolls are rotated, and the block-shaped metal A is moved (second hot rolling) while heating and pressurizing between the rolls, and has a flat part and a protruding part perpendicular thereto. T Processed into a shape, and further processed into an arc shape so that the protruding portion is on the inside to obtain an arc-shaped metal processed product, and then a friction member is fixed to the flat portion of the outer surface of the arc-shaped metal processed product or integrally molded A method of manufacturing an arc-shaped brake shoe. Using a short block-shaped metal B having a dimension that allows a single ring-shaped metal workpiece to be obtained, a lower roll having a flat pressing portion and an upper roll having a depression in the circumferential direction of the central portion are used. The block-shaped metal B is moved while rotating and heated and pressed between the rolls (first hot rolling) to form a projection on one side central portion of the block-shaped metal B, and then the projection on the one-side central portion A lower roll provided with a recess for forming a portion that becomes a T-shaped flat portion in the circumferential direction of the block-shaped metal B formed with a recess and a recess for forming a protruding portion perpendicular to the flat portion Rotate these rolls and move the block-shaped metal B (second hot rolling) while heating and pressurizing between the rolls so that the flat part and the protruding part perpendicular to it are formed. T-shaped After processing into a ring shape so that the protruding portion is on the inside, it is cut at a portion where an arc brake shoe of the required size can be formed to obtain several arc-shaped metal workpieces Then, a friction member is fixed to the flat part of the outer surface of each arc-shaped metal workpiece, or integrally molded, and the arc-shaped brake shoe manufacturing method is characterized by the following. A long block-shaped metal having a dimension capable of obtaining a plurality of arc-shaped brake shoes is rotated using a lower roll having a flat pressing portion and an upper roll having a depression in the circumferential direction of the central portion. The block-shaped metal is moved (first hot rolling) while heating and pressurizing between the rolls to form a protrusion on one side central portion of the block-shaped metal, and then a block formed with a protrusion on the one-side central portion A lower roll provided with a recess for forming a portion that becomes a T-shaped flat portion in the circumferential direction and an upper roll provided with a recess for forming a protruding portion perpendicular to the flat portion It was used to rotate these roles, and by while heated and pressed between rolls move blocks like metal (second hot rolling), pressurized to T-shape having a flat portion perpendicular protruding portions thereto Then, a plurality of divided T-shaped metal workpieces are obtained by cutting at a portion where an arc-shaped brake shoe having a required size can be formed. An arc-shaped brake shoe characterized in that an arc-shaped metal workpiece is obtained by machining into an arc shape so as to be inside, and then a friction member is fixed or integrally formed on a flat portion of the outer surface of the arc-shaped metal workpiece Manufacturing method. Rotate these rolls of long, block-shaped metal with dimensions that can provide a plurality of arc-shaped brake shoes, using a lower roll with a flat pressing part and an upper roll with a depression in the circumferential direction at the center. And the block-shaped metal is moved (first hot rolling) while heating and pressurizing between the rolls to form a protrusion on one side center of the block-shaped metal, and then a protrusion is formed on the one-side center. A lower roll provided with a recess for forming a portion that becomes a T-shaped flat portion in the circumferential direction of the block metal, and an upper portion provided with a recess for forming a protruding portion perpendicular to the flat portion using a roll, is rotated these roles, and by while heated and pressed between rolls move blocks like metal (second hot rolling), the T-shape having a flat portion perpendicular protruding portions thereto After further processing into a continuous spiral shape so that the protruding part of the T-shaped processed product is on the inside, it is cut at the part where an arc brake shoe of the required size can be formed, and the left and right cuts Obtain a plurality of divided arc-shaped metal workpieces with misalignment on the surface, and then correct the left and right misalignment of each cut surface for each segmented arc-shaped metal workpiece and machine it into an arc shape with parallel upper and lower surfaces. An arc-shaped brake shoe manufacturing method comprising: obtaining an arc-shaped metal workpiece, and then fixing or integrally molding a friction member on a flat portion of an outer surface of the arc-shaped metal workpiece.

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