Brake pad pressing die

Abstract

The utility model discloses a kind of brake pad pressing mould, it is related to brake pad processing technical field, including upper die, middle die and lower die.The present application provides a kind of brake pad pressing mould, in the exhaust and pre-chamfer forming stage of pressing, in the process of continuously depressing upper die, air in forming cavity is extruded, and it is quickly discharged outside mould by the exhaust groove opened in lower die, avoid air retention to cause product hollowing cracking, simultaneously, the pre-chamfer projection of lower die forming cavity inner wall is contacted with mixed material, pre-chamfer structure is formed directly in brake pad corner in pressing process, reduce subsequent processing allowance, after pressing is completed, upper die is reset, and the brake pad after forming is taken out, since it has been completed chamfer preforming by pre-chamfer projection, subsequent only a small amount of grinding can reach finished product requirement, reduce the risk of edge collapse, if the lower die unit of certain cavity appears abrasion or failure, this unit can be individually disassembled and replaced, without overall disassembly mould, maintenance is convenient and efficient.

Description

Technical Field

[0001] This application relates to the field of brake pad processing technology, and in particular to a brake pad pressing mold. Background Technology

[0002] In a car's braking system, brake pads are the most critical safety component. Brake pads are fixed to the brake drum or brake disc that rotates with the wheel. The friction between the friction pads and the brake disc achieves the effect of vehicle deceleration. In traditional technology, brake pads are mainly made by pressing sheet metal, which requires the use of special pressing molds and matching exhaust structures.

[0003] Existing brake pad compression molding dies rely solely on the gap between the lower and middle dies for venting, resulting in low venting efficiency. Air retention in the molding cavity can easily lead to quality defects such as brake pad cracking and hollowing, affecting product qualification rate. Furthermore, when brake pads requiring chamfering are pressed using traditional dies, extra mixed material needs to be reserved for subsequent grinding and chamfering, resulting in material waste. The subsequent grinding process is also quite extensive, and edge chipping is prone to occur during grinding, leading to low processing efficiency and high risk of finished product quality issues. Utility Model Content

[0004] This application is made in view of the above-mentioned problems, and its object is to provide a brake pad pressing mold to solve the problems mentioned in the background art. To achieve the above objectives, this utility model provides the following technical solution: a brake pad pressing mold, comprising an upper mold, a middle mold, and a lower mold. The upper mold is located at the top of the mold, and a middle mold is disposed below the upper mold, and a lower mold is disposed below the middle mold. The upper mold, middle mold, and lower mold together form a molding cavity for molding brake pads. The lower mold has an exhaust groove that is connected to the molding cavity. The side wall of the molding cavity of the lower mold has a pre-chamfered protrusion, and the lower mold adopts a split structure in which the cavities are not connected to each other.

[0005] Furthermore, the venting grooves are evenly distributed along the circumference of the lower mold, and the inner wall of the venting grooves adopts a rounded transition structure.

[0006] Furthermore, one end of the venting groove extends through to the outer side of the lower mold, and the other end of the venting groove is connected to the side wall of the molding cavity.

[0007] Furthermore, the shape of the pre-chamfered protrusion is adapted to the shape of the chamfer required for forming the brake pad, and the pre-chamfered protrusion is continuously arranged along the opposite sidewalls of the forming cavity.

[0008] Furthermore, the split-type lower mold includes multiple independent units, each unit corresponding to a molding cavity, and there is an installation gap between the units.

[0009] Furthermore, the upper mold and the middle mold are detachably connected, and the middle mold and the lower mold are positioned and engaged by locating pins or guide pillars.

[0010] Compared with the prior art, this utility model has the following beneficial effects: First, in the module assembly and preparation stage, each independent unit of the split lower mold is installed on the press worktable, and the positioning and cooperation between the lower mold and the middle mold are completed by positioning pins or guide columns. Then, the upper mold and the middle mold are detachably connected. At this time, the lower molds of each cavity do not interfere with each other, the weight of each piece is small, and the installation is convenient, thus completing the mold assembly before molding. Second, in the mixture filling and mold closing stage, brake pad mixture is filled into each molding cavity surrounded by the middle mold and the lower mold. The press is started to drive the upper mold to close downward. Since the lower mold adopts a split design, the proportional press can apply independent and balanced pressure to each lower mold unit according to the filling amount of mixture in each cavity or the preset molding thickness, ensuring the pressure of each cavity. Force balance; Finally, during the pressing, venting, and pre-chamfering stages, as the upper mold continues to press down, the air in the forming cavity is compressed and quickly discharged outside the mold through the venting grooves on the lower mold, preventing air stagnation that could cause product hollowing and cracking. At the same time, the pre-chamfering protrusions on the inner wall of the lower mold forming cavity contact the mixture, directly forming a pre-chamfering structure on the edge of the brake pad during the pressing process, reducing subsequent processing allowances. After pressing is completed, the upper mold moves upward to reset, and the formed brake pad is removed. Since the pre-chamfering has been pre-formed through the pre-chamfering protrusions, only a small amount of grinding is needed to meet the finished product requirements, reducing the risk of edge chipping. If a lower mold unit in a certain cavity is worn or malfunctions, the unit can be disassembled and replaced separately without disassembling the entire mold, making maintenance convenient and efficient. Attached Figure Description

[0011] To more clearly illustrate the technical solutions in the embodiments of this drawing or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this drawing. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0012] Figure 1 This is a schematic diagram of the overall structure of the device of this utility model; Figure 2 This is a schematic diagram of the split structure of the device of this utility model; Figure 3 This is a schematic diagram of the lower mold venting groove of this utility model.

[0013] The following are the symbols in the attached diagram: 1. Upper mold; 2. Middle mold; 3. Lower mold; 4. Molded brake pad; 5. Venting groove; 6. Pre-chamfered protrusion.

[0014] The purpose, features, and advantages of this accompanying drawing will be further explained in conjunction with the embodiments and with reference to the accompanying drawing. Detailed Implementation

[0015] To make the objectives, technical solutions, and advantages of this application clearer, the following description and illustration are provided in conjunction with embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application. All other embodiments obtained by those skilled in the art based on the embodiments provided in this application without inventive effort are within the scope of protection of this application.

[0016] Obviously, the following description is merely some examples or embodiments of this application. Those skilled in the art can apply this application to other similar scenarios without any inventive effort. Furthermore, it is understood that although the effort involved in such development may be complex and lengthy, for those skilled in the art related to the content disclosed in this application, any changes to design, manufacturing, or production based on the technical content disclosed in this application are merely conventional technical means and should not be construed as insufficient disclosure of the content of this application.

[0017] Unless otherwise specified, the terms "comprising" and "including" as used in this application can be open-ended or closed-ended. For example, "comprising" and "including" can mean that other components not listed may also be included, or that only the listed components may be included.

[0018] Unless otherwise specified, the term "or" is inclusive in this application. For example, the phrase "A or B" means "A, B, or both A and B". More specifically, the condition "A or B" is satisfied by any of the following conditions: A is true (or exists) and B is false (or does not exist); A is false (or does not exist) and B is true (or exists); or both A and B are true (or exist).

[0019] Terminology explanation: such as Figures 1 to 3As shown, a brake pad pressing mold includes an upper mold 1, a middle mold 2, and a lower mold 3. The upper mold 1 is located at the top of the mold, and the middle mold 2 is arranged below the upper mold 1. The lower mold 3 is arranged below the middle mold 2. The upper mold 1, the middle mold 2, and the lower mold 3 enclose a molding cavity for molding a brake pad 4. The lower mold 3 has an exhaust groove 5, which is connected to the molding cavity. The side wall of the molding cavity of the lower mold 3 is provided with a pre-chamfered protrusion 6. The lower mold 3 adopts a split structure in which each cavity is not connected to the others. The exhaust grooves 5 are evenly distributed along the circumference of the lower mold 3, and the inner wall of the exhaust grooves 5 adopts a rounded transition structure. One end of the exhaust groove 5 extends to the outer side of the lower mold 3, and the other end of the exhaust groove 5 is connected to the side wall of the molding cavity. The shape of the pre-chamfered protrusion 6 is adapted to the shape of the chamfer required for molding the brake pad 4, and the pre-chamfered protrusion 6 is continuously arranged along the opposite side walls of the molding cavity. The specific operation is as follows: During the pressing, venting and pre-chamfering stages, as the upper mold 1 continues to press down, the air in the forming cavity is compressed and quickly discharged to the outside of the mold through the venting groove 5 on the lower mold 3, avoiding air retention that could cause the product to crack. At the same time, the pre-chamfering protrusion 6 on the inner wall of the forming cavity of the lower mold 3 contacts the mixed material, directly forming a pre-chamfering structure on the corner of the forming brake pad 4 during the pressing process, reducing the subsequent processing allowance. After pressing is completed, the upper mold 1 moves upward to reset and the forming brake pad 4 is removed. Since the pre-chamfering has been pre-formed through the pre-chamfering protrusion 6, only a small amount of grinding is needed to meet the finished product requirements, reducing the risk of edge chipping. If a lower mold 3 unit in a certain cavity is worn or malfunctions, the unit can be disassembled and replaced separately without disassembling the entire mold, making maintenance convenient. like Figures 1 to 3 As shown, the split-structure lower mold 3 includes multiple independent units, each unit corresponding to a molding cavity, and there is an installation gap between each unit. The upper mold 1 and the middle mold 2 are detachably connected, and the middle mold 2 and the lower mold 3 are positioned and engaged by positioning pins or guide pillars. The specific operation is as follows: In the module assembly and preparation stage, each independent unit of the split lower mold 3 is installed on the press worktable. The positioning and matching of the lower mold 3 and the middle mold 2 are completed by positioning pins or guide columns. Then, the upper mold 1 and the middle mold 2 are detachably connected. At this time, each cavity of the lower mold 3 does not interfere with each other. The single piece is lightweight and easy to install, thus completing the mold assembly before molding. In the mixing and mold closing stage, brake pad mixture is filled into each molding cavity surrounded by the middle mold 2 and the lower mold 3. The press is started to drive the upper mold 1 to close the mold downward. Since the lower mold 3 adopts a split design, the proportional press can apply independent and balanced pressure to each lower mold 3 unit according to the filling amount of each cavity mixture or the preset molding thickness to ensure the pressure balance of each cavity.

[0020] Working principle: First, in the module assembly and preparation stage, the independent units of the split lower mold 3 are installed onto the press worktable. Positioning pins or guide pillars are used to complete the positioning and engagement of the lower mold 3 and the middle mold 2. Then, the upper mold 1 and the middle mold 2 are detachably connected. At this point, the lower molds 3 in each cavity do not interfere with each other, have a small individual weight, and are easy to install, completing the mold assembly before molding. Second, in the mixture filling and mold closing stage, brake pad mixture is filled into each molding cavity enclosed by the middle mold 2 and the lower mold 3. The press is started to drive the upper mold 1 to close downwards. Because the lower mold 3 adopts a split design, the proportional press can apply independent and balanced pressure to each lower mold 3 unit according to the amount of mixture filling in each cavity or the preset molding thickness, ensuring pressure balance in each cavity. Finally, in During the pressing, venting, and pre-chamfering stages, as the upper mold 1 continues to press down, the air in the forming cavity is compressed and quickly discharged to the outside of the mold through the venting groove 5 on the lower mold 3, preventing air from accumulating and causing the product to crack. At the same time, the pre-chamfering protrusion 6 on the inner wall of the forming cavity of the lower mold 3 contacts the mixture, directly forming a pre-chamfering structure on the corner of the forming brake pad 4 during the pressing process, reducing the subsequent processing allowance. After pressing is completed, the upper mold 1 moves upward to reset and the forming brake pad 4 is removed. Since the pre-chamfering has been pre-formed by the pre-chamfering protrusion 6, only a small amount of grinding is required to meet the finished product requirements, reducing the risk of edge chipping. If a lower mold 3 unit in a certain cavity is worn or malfunctions, the unit can be disassembled and replaced separately without disassembling the entire mold, making maintenance convenient and efficient.

[0021] It should be noted that this application is not limited to the above-described embodiments. The above embodiments are merely examples, and any embodiments with the same structure and effect as the technical concept within the scope of this application are included in the technical scope of this application. Furthermore, various modifications that can be conceived by those skilled in the art to the embodiments, and other ways of constructing by combining some of the constituent elements of the embodiments, without departing from the spirit of this application, are also included in the scope of this application.

Claims

1. A brake pad pressing mold, comprising an upper mold (1), a middle mold (2), and a lower mold (3), characterized in that, The upper mold (1) is located at the top of the mold, and a middle mold (2) is provided below the upper mold (1), and a lower mold (3) is provided below the middle mold (2). The upper mold (1), the middle mold (2) and the lower mold (3) together form a molding cavity for molding brake pads (4). The lower mold (3) is provided with an exhaust groove (5), and the exhaust groove (5) is connected to the molding cavity. The side wall of the molding cavity of the lower mold (3) is provided with a pre-chamfered protrusion (6), and the lower mold (3) adopts a split structure in which each cavity is not connected to the other.

2. The brake pad pressing mold according to claim 1, characterized in that, The exhaust grooves (5) are evenly distributed along the circumference of the lower mold (3), and the inner wall of the exhaust grooves (5) adopts a circular arc transition structure.

3. The brake pad pressing mold according to claim 2, characterized in that, One end of the venting groove (5) extends through to the outer side of the lower mold (3), and the other end of the venting groove (5) is connected to the side wall of the molding cavity.

4. A brake pad pressing mold according to claim 3, characterized in that, The shape of the pre-chamfered protrusion (6) is adapted to the shape of the chamfer required for the molded brake pad (4), and the pre-chamfered protrusion (6) is continuously arranged along the opposite sidewalls of the molding cavity.

5. A brake pad pressing mold according to claim 4, characterized in that, The split-type lower mold (3) includes multiple independent units, each unit corresponding to a molding cavity, and there is an installation gap between the units.

6. A brake pad pressing mold according to claim 5, characterized in that, The upper mold (1) and the middle mold (2) are detachably connected, and the middle mold (2) and the lower mold (3) are positioned and fitted by positioning pins or guide pins.

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