Drum brake pad drilling tool

Abstract

The utility model relates to a drum brake pad drilling tool which comprises a die base with an arc-shaped protrusion at the top, and a sinking groove for installing a detachable steel bar is formed in the surface of the die base. A first limiting plate and a second limiting plate which are adjustable are installed on the front side and the rear side of the base, a supporting plate parallel to the radian of the die base is arranged above the base, and the supporting plate is fixed to the base through oblique locking bolts. And the steel bar is provided with a locking end part with a fixing hole, and is connected with the limiting plate through a fastening bolt to form three-point positioning. The steel bars are arranged on the die base to achieve the effects of rapid replacement and rapid maintenance, the synergistic effect of the arc-shaped base and the supporting plate guarantees the machining precision, and the inclined locking structure effectively restrains machining vibration. The multi-specification drum brake pad drilling tool is particularly suitable for batch drilling operation of multi-specification drum brake pads, the service life of the tool is prolonged, meanwhile, the maintenance cost is reduced, and the product quality is guaranteed.

Description

Technical Field

[0001] This utility model relates to the field of automotive brake pad drilling technology, and in particular to a drilling fixture for drum brake pads. Background Technology

[0002] In the production of drum brake pads, after the inner and outer arcs are ground and vulcanized, rivet holes for fixing to the brake shoes need to be drilled. Because the drilling surface of drum brake pads is curved, the fit of the drilling die is critical. After a period of use, the drilling die wears down at the drilling position, making repair difficult and unable to maintain the original radius. This leads to tearing of the bottom hole in the product, requiring replacement of the drilling die. This results in short die life and high production costs. The main drawbacks of the existing technology are as follows:

[0003] 1. The drill bit is in direct contact with the curved surface of the mold, causing the contact area to be cut, resulting in mold wear;

[0004] 2. If the drilling die is not repaired after wear, the brake pad will not be supported at the bottom during drilling, causing the hole to tear.

[0005] 3. Repairing requires welding or drilling, followed by grinding the curved surface, which makes repairs difficult and can easily result in uneven grinding points and misalignment of the curvature, increasing the likelihood of defective products.

[0006] 4. Due to the difficulty in repairing worn molds, mold life is short and production costs are high;

[0007] Therefore, in order to improve the impact of drilling on the mold and extend the service life of the mold, this utility model proposes a simple and easy-to-use drilling fixture for drum brake pads. Utility Model Content

[0008] (1) Technical solution

[0009] To solve the above-mentioned technical problems, this utility model provides a drilling fixture for drum brake pads, including a mold base with an arc-shaped upward protrusion at the top, and a groove on the mold base to facilitate the installation of steel bars, which are detachably installed in the drilling hole processing area.

[0010] Preferably, a first limiting plate and a second limiting plate are respectively installed on the front and rear sides of the mold base. The first limiting plate and the second limiting plate are respectively installed on the vertical surfaces on both sides of the mold base and locked by external screws.

[0011] Preferably, a support plate parallel to the curvature of the mold base is installed above the second limiting plate; after assembly, the support plate covers the steel strip.

[0012] Preferably, the support plate is provided with a locking groove, and the locking groove is provided with a locking step;

[0013] The mold base is provided with an assembly hole that matches the locking groove;

[0014] During assembly, the second locking bolt is inserted into the locking step at an angle downwards to lock the support plate onto the mold base.

[0015] Preferably, the steel bar includes an arc-shaped top support end, and locking ends are provided on both outward-facing sides of the arc-shaped top support end. The locking ends are horizontally arranged, and the locking ends are connected to the arc-shaped top support end through a transition step end.

[0016] A fixing hole is provided at the end of the transition step;

[0017] During assembly, the first set bolt is inserted into the fixing hole to lock the locking ends on the front and rear sides of the steel bar onto the first limiting plate and the second limiting plate, respectively.

[0018] After assembly, the upper surface of the steel bar is flush with the upper surface of the mold base.

[0019] Preferably, the transition step end is provided with a rounded chamfer.

[0020] (2) Beneficial effects

[0021] This utility model provides a drilling fixture for drum brake pads. Compared with the prior art, this utility model has the following advantages: This utility model replaces the original integral mold base with a steel strip insertion method, ensuring the inner arc fit. By setting steel strips locked at both ends, it ensures that the steel strips will not shift or deviate during processing, ensuring that the steel strip is tightly attached to the groove, effectively preventing the drilling from damaging the mold base. During drilling, the drill bit can only contact the steel strip at most, without contacting the mold base. The surface of the mold base will not be cut by the drill bit and will not be worn. The steel strip can also support the inner arc surface of the brake pad well, ensuring the quality of the bottom hole. When the steel strip is worn, only the steel strip needs to be replaced, without the need for mold repair. It is quick and convenient, does not delay production, and can ensure product quality. It effectively extends the overall service life of the mold base and reduces production costs. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the disassembled structure of this utility model.

[0023] Figure 2 This is a schematic diagram of the overall structure of the present invention after assembly.

[0024] Figure 3 for Figure 2 Top view.

[0025] Figure 4 for Figure 2 Side view.

[0026] In the picture:

[0027] Mold base (1), sinker (11), steel bar (21), arc-shaped top support end (21), transition step end (22), locking end (23), fixing hole (24), first set bolt (25), first limiting plate (3), second limiting plate (4), support plate (5), locking groove (51), second locking bolt (52). Detailed Implementation

[0028] The present invention will be further described in conjunction with the accompanying drawings and embodiments.

[0029] like Figure 1 As shown, one embodiment of the drilling fixture for drum brake pads according to this utility model includes a mold base 1 with an arc-shaped upward protrusion at the top. The mold base 1 has a recess 11 for facilitating the installation of a steel strip 2. The steel strip 2 is detachably installed in the drilling area. For ease of installation, a first limiting plate 3 and a second limiting plate 4 are respectively installed on the front and rear sides of the mold base 1. The first limiting plate 3 and the second limiting plate 4 are respectively installed on the vertical surfaces on both sides of the mold base 1 and locked with external screws. A support plate 5 parallel to the arc of the mold base 1 is installed above the second limiting plate 4. After assembly, the support plate 5 covers the steel strip 2. The specific installation method of the support plate 5 can be: the support plate 5 has a locking groove 51. The mold base 1 has a locking step; the mold base 1 has an assembly hole that matches the locking groove 51; during assembly, the second locking bolt 52 is inserted into the locking step and locks the support plate 5 onto the mold base 1 at an angle downward; specifically, the steel bar 2 includes an arc-shaped top support end 21, and the arc-shaped top support end 21 has locking ends 23 on both outward sides. The locking ends 23 are horizontally set, and the locking ends 23 and the arc-shaped top support end 21 are connected by a transition step end 22, which is set with a rounded chamfer; the transition step end 22 has a fixing hole 24; during assembly, the first set bolt 25 is inserted into the fixing hole 24 to lock the locking ends 23 on the front and rear sides of the steel bar 2 onto the first limiting plate 3 and the second limiting plate 4, respectively; after assembly, the upper surface of the steel bar 2 is flush with the upper surface of the mold base 1.

[0030] Before use, the steel bar is installed in the recess. The recess allows for the replacement of the steel bar, forming a drilling reference surface. The first and second limiting plates are installed vertically to ensure the lateral positioning of the steel bar. The support plate, secured by oblique locking bolts, generates a downward force to press against the steel bar. The transition step end of the steel bar forms a three-point constraint with the limiting plates. The rounded chamfer design at the transition step end effectively disperses cutting stress. After assembly, the upper surface of the steel bar is flush with the base, forming a continuous support surface. This ensures that during use, the arc-shaped protrusion of the mold base matches the inner arc surface of the brake pad, facilitating effective drilling and reducing damage to the mold base. It also allows for convenient maintenance and replacement in later use, extending the overall service life of the tooling.

[0031] Specifically, in production:

[0032] 1. Based on the hole arrangement of the drum brake pads, machine multiple countersunk grooves with a width of 25mm on the arc surface of the drilling mold;

[0033] 2. Inlay a 24mm wide and 0.7mm thick steel strip into the mold base groove, and install it by locking at both ends to ensure that the steel strip is tightly attached to the groove and that the upper surface of the steel strip is completely attached to the upper surface of the mold base.

[0034] 3. During drilling, the drill bit only contacts the steel strip and not the mold. The mold surface will not be cut by the drill bit and will not be worn. Meanwhile, the steel strip can support the inner arc surface of the brake pad well, ensuring the quality of the bottom hole and avoiding tearing of the hole during processing.

[0035] 4. When the steel strip wears out, only the steel strip needs to be replaced; there is no need to repair the mold base, making it quick and convenient.

[0036] The embodiments described above are merely preferred embodiments of the present invention, and are described in a relatively specific and detailed manner. However, the present invention is not limited to these embodiments. It should be noted that for those skilled in the art, any improvements made without departing from the spirit of the present invention fall within the protection scope of the present invention. Therefore, the protection scope of this patent should be determined by the appended claims.

Claims

1. A drum brake pad drilling tool, characterized by, The utility model relates to a steel bar drilling jig, including the mould base (1) that top is curved and sets up to the upward convex, the mould base (1) is provided with the sunken groove (11) of facilitating steel bar (2) installation, the steel bar (2) can be detachably installed in the drilling hole position processing area.

2. The drum brake pad drilling fixture of claim 1 wherein, The first limiting plate (3) and the second limiting plate (4) are respectively installed on the vertical surface of the two sides of the mould base (1) and are locked through external screws.

3. The drum brake pad drilling fixture of claim 2 wherein, The support plate (5) is parallel to the arc of the mould base (1) and covers the steel bar (2) after assembly.

4. The drum brake pad drilling fixture of claim 3 wherein, The support plate (5) is provided with a locking groove (51) with a clamping step inside. The mould base (1) is provided with an assembly hole matched with the locking groove (51). During assembly, the second locking bolt (52) is inserted into the clamping step and locks the support plate (5) on the mould base (1) obliquely downward.

5. The drum brake pad drilling fixture of any one of claims 1-4, wherein, The steel bar (2) includes an arc-shaped supporting end (21), and the two sides of the arc-shaped supporting end (21) are provided with locking ends (23) outward. The overstep end (22) is provided with a fixing hole (24). During assembly, the first locking bolt (25) is inserted into the fixing hole (24) to lock the locking ends (23) on the front and back sides of the steel bar (2) on the first limiting plate (3) and the second limiting plate (4) respectively. After assembly, the upper surface of the steel bar (2) is flush with the upper surface of the mould base (1).

6. The drum brake pad drilling fixture of claim 5 wherein, The overstep end (22) is provided with a circular arc chamfer.

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