Preparation mold and preparation method of novel non-riveting brake shoe assembly

Abstract

The invention discloses a novel non-riveting brake shoe assembly manufacturing mold and method, the manufacturing mold comprises a lower mold, a plurality of fixing grooves are formed in the top face of the lower mold, and a pair of supporting parts are arranged in the fixing grooves; a plurality of through feeding slotted holes are formed in the top surface of the middle mold; pressing blocks in one-to-one correspondence with the feeding groove holes are arranged on the bottom surface of the upper mold; the shoe surface, the feeding slotted hole and the pressing block are encircled to form a forming cavity of which the shape is consistent with that of a friction plate; the feeding slotted hole formed in the middle die, the shoe face and the pressing block arranged on the bottom face of the upper die are matched to form the forming cavity, the pressing block is pressed downwards, friction powder is hot-pressed into the friction plate in the forming cavity, the friction plate and the shoe face are bonded and fixed together during hot-press forming, the production process of the brake shoe assembly is simplified, the production cost is low, the production efficiency is high, and the production cost is low. And a glue bonding process is canceled, so that a glue pollution treatment link is avoided.

Description

Technical Field

[0001] The invention belongs to the technical field of brakes, and in particular relates to a preparation mold and a preparation method for a novel rivetless brake shoe assembly. Background Art

[0002] The brake shoe assembly is a key safety component in the automobile braking system. It is usually installed on the brake drum and is pushed outward by the brake cam or push rod to press the brake drum to achieve braking. The brake shoe assembly is usually half-moon shaped and is the friction component of the drum brake. It not only needs to have sufficient strength and rigidity, but also needs to have a high and stable friction coefficient, appropriate wear resistance, heat resistance, heat dissipation and heat capacity.

[0003] The brake shoe assembly is mainly composed of a brake shoe and a friction plate. At present, there are generally two ways to connect the brake shoe and the friction plate in China. One is riveting, and the friction plate is thicker. The riveted brake shoe assembly has good connection stability and is generally used in the brake system of light and heavy trucks. However, the riveted brake shoe assembly also has obvious disadvantages. The braking force transmission efficiency of the riveted brake shoe assembly is slightly low, especially in the case of high-speed driving or emergency braking. The response speed and control accuracy of the braking force output are difficult to meet higher performance requirements; the riveted brake shoe assembly has a short life, and the rivets are easy to loosen or break under the friction and wear environment for a long time, resulting in the performance of the braking system. There are even safety hazards; in addition, the riveted joints of the riveted brake shoe assembly need to use rivets as fasteners, which are heavy, occupy a large space and are not easy to disassemble. Another connection method is bonding. Compared with the riveted brake shoe, the bonded brake shoe assembly has a slightly lower connection strength, but the bonded brake shoe has a beautiful appearance and lower energy consumption than the riveting process, and the friction plate utilization rate is higher, so the friction plate is generally thinner and is generally used for light vehicles such as passenger cars or light trucks. However, the bonded brake shoe requires a large amount of capital investment in high-standard bonding and molding production lines for manufacturers. If the quality of the adhesive is not high or the bonding process is not standardized, the bonding strength of the bonded brake shoe may be insufficient, affecting the braking performance of the vehicle's braking system and posing a safety hazard. Therefore, the entry threshold for bonded brake shoes is high and there is a glue pollution treatment process.

[0004] In view of the above-mentioned technical problems in the preparation process of the brake shoe assembly, it is necessary to develop a new production process for the brake shoe assembly. Summary of the invention

[0005] The object of the present invention is to provide a new type of preparation mold and preparation method of a rivetless brake shoe assembly to solve at least one of the above technical problems.

[0006] To achieve the above object, the technical solution adopted by the present invention is:

[0007] A novel preparation mold for a rivet-free brake shoe assembly, wherein the brake shoe assembly comprises a brake shoe and a friction plate, wherein the brake shoe comprises a shoe surface and a tendon fixed to the shoe surface, and wherein the preparation mold comprises:

[0008] A lower mold, wherein a plurality of fixing grooves are formed on the top surface of the lower mold, a pair of supporting parts are provided in the fixing grooves, the pair of supporting parts are provided on both sides of the tendon of the brake shoe assembly to be prepared, and the pair of supporting parts are supported on the bottom surfaces of the corresponding shoe surfaces;

[0009] A middle mold, wherein a plurality of through-feeding slots are provided on the top surface of the middle mold, wherein the feeding slots are arranged in one-to-one correspondence with the plurality of fixing slots, and the bottom of the middle mold is pressed against the corresponding shoe surface so that the shoe surface blocks the bottom end of the feeding slots;

[0010] The upper mold has a bottom surface provided with a pressing block corresponding to the feeding slot hole one by one, and the pressing block blocks the top of the feeding slot hole; wherein the feeding slot hole and the pressing block cooperate with the corresponding shoe surface to form a molding cavity with a shape consistent with the friction plate.

[0011] The present invention uses a lower mold to fix the brake shoe. Specifically, the tendon is placed between a pair of support parts to fix the brake shoe. The support part is also used to support the shoe surface. The top of the support part fits with the bottom surface of the shoe surface to prevent the shoe surface from being pressed and deformed. The feeding slot hole opened on the middle mold, the shoe surface and the pressing block arranged on the bottom surface of the upper mold cooperate to form a molding cavity. The pressing block is pressed downward to hot-press the friction powder into a friction plate in the molding cavity. During the hot-pressing molding, the friction plate is bonded and fixed to the shoe surface, which simplifies the production process of the brake shoe assembly, has low production cost and high production efficiency, eliminates the glue bonding process, and avoids the glue pollution treatment link.

[0012] Furthermore, the height of a pair of the support parts is set so that there is no contact between the bottom of the brake shoe and the bottom surface of the fixed groove. The downward pressure of the pressure block is transmitted to the support part through the shoe surface and then to the lower mold. The tendon does not abut against the bottom surface of the fixed groove and does not bear the downward pressure from the pressure block, thereby avoiding the shoe surface not being completely fitted with the support part due to the size error between different tendons, thereby preventing the brake shoe from being deformed.

[0013] Furthermore, a plurality of fixing grooves are disposed on both sides of the lower mold and are symmetrically arranged, so that the forces on both ends of the upper mold are evenly applied, and the upper mold can be pressed down more accurately, thereby improving the qualified rate of the pressed friction plate.

[0014] Furthermore, the present invention also includes a shaping part arranged on both sides of the top of the shoe surface, and the shaping part is provided with a first shaping surface for forming the end face of the friction plate; the first shaping surface is used to shape the end faces of the friction plate at both ends. For example, if the first shaping surface is not provided, the formed end face of the friction plate and the inner arc surface of the friction plate form an acute angle, which does not meet the design requirements of the friction plate; an L-shaped connecting rod is fixed on the top of the shaping part, and a sliding rod is fixed on the L-shaped connecting rod. The inner wall of the feeding trough hole is provided with a vertical sliding groove cooperating with the sliding rod, and the bottom of the middle mold is provided with a horizontal sliding groove cooperating with the sliding rod, and the vertical sliding groove is connected with the corresponding horizontal sliding groove, and the L-shaped connecting rod is used to fix the sliding rod and the shaping part, and the sliding rod is matched with the vertical sliding groove to enable the shaping part to slide up and down along the inner wall of the feeding trough hole. After the shaping part slides to the bottom of the middle mold, the shaping part can slide horizontally under the middle mold through the sliding rod matching the horizontal sliding groove.

[0015] Furthermore, the bottom surface of the pressing block is provided with a second shaping surface for forming the outer arc surface of the friction plate, and the provided second shaping surface is used for shaping the outer arc surface of the friction plate.

[0016] Furthermore, the bottom of the shaping portion fits the hoof surface, and the hoof surface can better support the middle mold, so that the middle mold can be installed more accurately and stably.

[0017] The present invention also provides a method for preparing a novel rivet-free brake shoe assembly, based on the above-mentioned preparation mold, comprising the following steps:

[0018] S1. Install the prepared mold on a hot pressing device;

[0019] S2, fixing the brake shoe between a pair of the supporting parts;

[0020] S3, using the hot pressing equipment to install the middle mold on the hoof surface;

[0021] S4, feeding friction powder into the feeding slot;

[0022] S5. The upper mold moves downward to press the friction plate.

[0023] Furthermore, when the friction plate is pressed, the hot pressing pressure is 180kg / cm 2 .

[0024] Furthermore, when the friction plate is pressed, the temperature of the upper mold is 160°C, and the temperature of the lower mold is 140°C.

[0025] Furthermore, when the friction plate is pressed, the holding temperature is 3 minutes. By hot pressing the friction plate using the above method, the friction plate can be bonded and fixed to the shoe surface of the brake shoe at the same time during the hot pressing step of the friction plate, and the shear strength can reach 2.0-2.5MPa.

[0026] Compared with the prior art, the present invention has the following beneficial effects:

[0027] The present invention uses a lower mold to fix the brake shoe. Specifically, the tendon is placed between a pair of support parts to fix the brake shoe. The support part is also used to support the shoe surface. The top of the support part fits with the bottom surface of the shoe surface to prevent the shoe surface from being pressed and deformed. The feeding slot hole opened on the middle mold, the shoe surface and the pressing block arranged on the bottom surface of the upper mold cooperate to form a molding cavity. The pressing block is pressed downward to hot-press the friction powder into a friction plate in the molding cavity. During the hot-pressing molding, the friction plate is bonded and fixed to the shoe surface, which simplifies the production process of the brake shoe assembly, has low production cost and high production efficiency, eliminates the glue bonding process, and avoids the glue pollution treatment link. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a front view of a mold for preparing a novel rivetless brake shoe assembly in this embodiment;

[0029] Figure 2 This is a schematic diagram of the lower mold structure in this embodiment;

[0030] Figure 3 This is a diagram showing the position relationship between the lower mold and the brake shoe in this embodiment;

[0031] Figure 4 This is a cross-sectional view of the molding portion in this embodiment;

[0032] Figure 5 for Figure 4 A partial enlarged view of the middle part;

[0033] Figure 6 Schematic diagram of the brake shoe assembly structure in this embodiment;

[0034] In the figure: 1, brake shoe; 101, shoe surface; 102, tendon; 2, lower mold; 201, fixing groove; 202, supporting part; 3, middle mold; 301, feeding slot; 4, upper mold; 401, pressing block; 402, second shaping surface; 5, shaping part; 501, first shaping surface; 6, friction plate; 7, L-shaped connecting rod; 8, sliding rod; 9, vertical slide groove; 10, horizontal slide groove. DETAILED DESCRIPTION

[0035] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0036] like Figure 1 and Figure 6 As shown, this embodiment provides a novel preparation mold for a rivetless brake shoe assembly, wherein the brake shoe assembly comprises a brake shoe 1 and a friction plate 6, wherein the brake shoe 1 comprises a shoe surface 101 and a tendon 102 fixed to the shoe surface 101, and wherein the preparation mold comprises:

[0037] Lower mold 2, such as Figure 2 and Figure 3 As shown, the lower mold 2 is a rectangular metal plate, and a plurality of fixing grooves 201 are opened on the top surface of the lower mold 2. A pair of supporting parts 202 are arranged in the fixing grooves 201, and the supporting parts 202 extend out of the fixing grooves 201. The pair of supporting parts 202 are arranged on both sides of the tendon 102 of the brake shoe assembly to be prepared, and the pair of supporting parts 202 are supported on the bottom surface of the corresponding shoe surface 101;

[0038] The middle mold 3 is a rectangular metal product, and a plurality of through-feeding slots 301 are provided on the top surface of the middle mold 3. The feeding slots 301 are arranged one-to-one with the plurality of fixing slots 201. The bottom of the middle mold 3 is pressed against the corresponding shoe surface 101, so that the shoe surface 101 blocks the bottom end of the feeding slots 301.

[0039] The upper mold 4 and the lower mold 2 are rectangular metal plates. The bottom surface of the upper mold 4 is provided with a pressure block 401 corresponding to the feeding slot hole 301, and the pressure block 401 blocks the top of the feeding slot hole 301; wherein the feeding slot hole 301 and the pressure block 401 cooperate with the corresponding shoe surface 101 to form a molding cavity with a shape consistent with the friction plate 6.

[0040] The present invention uses a lower mold 2 to fix the brake shoe 1. Specifically, the tendon 102 is placed between a pair of support parts 202 to fix the brake shoe 1. The support part 202 is also used to support the shoe surface 101. The top of the support part 202 fits with the bottom surface of the shoe surface 101 to prevent the shoe surface 101 from being compressed and deformed. The feeding slot 301 opened on the middle mold 3, the shoe surface 101 and the pressing block 401 set on the bottom surface of the upper mold 4 cooperate to form a molding cavity. The pressing block 401 is pressed downward to hot-press the friction powder into a friction plate 6 in the molding cavity. During the hot-pressing molding, the friction plate 6 is bonded and fixed to the shoe surface 101 to form a brake shoe assembly, which simplifies the production process of the brake shoe assembly, has low production cost and high production efficiency, eliminates the glue bonding process, and avoids the glue pollution treatment link.

[0041] Furthermore, the height of the pair of support portions 202 is set so that the bottom of the brake shoe 1 does not contact the bottom surface of the fixing groove 201. The downward pressure of the pressing block 401 is transmitted to the support portion 202 through the shoe surface 101, and then transmitted to the lower mold 2. The tendon 102 does not abut against the bottom surface of the fixing groove 201 and does not bear the downward pressure from the pressing block 401, thereby avoiding the shoe surface 101 not being completely fitted with the support portion 202 due to the size error between different tendons 102, thereby preventing the brake shoe 1 from being deformed.

[0042] Furthermore, a plurality of fixing grooves 201 are disposed on both sides of the lower mold 2 and are symmetrically arranged, so that the forces on both ends of the upper mold 4 are evenly applied, and the upper mold 4 can be pressed down more accurately, thereby improving the qualified rate of the pressed friction plate 6 .

[0043] Furthermore, if Figure 4 and Figure 5The present embodiment further comprises a shaping portion 5 disposed on both sides of the top of the shoe surface 101, and the shaping portion 5 is provided with a first shaping surface 501 for forming the end surface of the friction plate 6; the first shaping surface 501 is used to shape the end surfaces of both ends of the friction plate 6. For example, if the first shaping surface 501 is not provided, the end surface of the friction plate 6 formed forms an acute angle with the inner arc surface of the friction plate 6, which does not meet the design requirements of the friction plate 6; an L-shaped connecting rod 7 is fixed on the top of the shaping portion 5, and the L A slide bar 8 is fixed on the L-shaped connecting rod 7, a vertical slide groove 9 cooperating with the slide bar 8 is provided on the inner wall of the feeding slot hole 301, a transverse slide groove 10 cooperating with the slide bar 8 is provided at the bottom of the middle mold 3, the vertical slide groove 9 is connected with the corresponding transverse slide groove 10, and the vertical slide groove 9 and the transverse slide groove 10 are both T-shaped grooves; the L-shaped connecting rod 7 is used to fix the slide bar 8 with the shaping part 5, and the slide bar 8 is provided to cooperate with the vertical slide groove 9, so that the shaping part 5 can The shaping part 5 slides up and down along the inner wall of the feeding slot hole 301. After the shaping part 5 slides to the bottom of the middle mold 3, the shaping part 5 can slide horizontally under the middle mold 3 through the sliding rod 8 and the horizontal sliding groove 10; when installing the middle mold 3, the shaping part 5 is first moved horizontally to make the shaping part 5 close to the shoe surface 101, and then the middle mold 3 is pressed down, and the shaping part 5 and the middle mold 3 slide vertically, so that the shaping part 5 moves into the feeding slot hole 301, and the inner wall of the feeding slot hole 301 presses the shaping part 5 to form a friction plate 6. The end surface is formed to provide support. After the friction plate 6 is pressed onto the shoe surface 101, the middle mold 3 is first lifted so that the shaping part 5 is at the bottom of the middle mold 3. At this time, the shaping part 5 is clamped up and down by the shoe surface 101 and the friction plate 6. The shaping part 5 is moved laterally to keep the shaping part 5 away from the friction plate 6. Subsequently, the middle mold 3 can be smoothly removed from the brake shoe 1 assembly; by arranging the shaping part 5 to be able to slide vertically and laterally on the middle mold 3, the middle mold 3 can be smoothly demoulded after the hot pressing is completed.

[0044] Furthermore, a second shaping surface 402 for forming the outer arc surface of the friction plate 6 is provided on the bottom surface of the pressing block 401 , and the second shaping surface is used to shape the outer arc surface of the friction plate 6 .

[0045] Furthermore, the bottom of the shaping portion 5 fits the hoof surface 101 , and the hoof surface 101 can better support the middle mold 3 , so that the middle mold 3 can be installed more accurately and stably.

[0046] The present invention also provides a method for preparing a novel rivet-free brake shoe assembly, based on the above-mentioned preparation mold, comprising the following steps:

[0047] S1. Install the prepared mold on a hot pressing device;

[0048] S2, fixing the brake shoe 1 between a pair of the supporting parts 202;

[0049] S3, using the hot pressing equipment to install the middle mold 3 on the shoe surface 101;

[0050] S4, feeding friction powder into the feeding slot 301;

[0051] S5 , the upper mold 4 moves downward to press the friction plate 6 , and presses the friction plate 6 onto the shoe surface 101 , so that the friction surface and the shoe surface 101 are fixedly connected.

[0052] In step S3, when the middle mold 3 is installed on the hoof surface 101, it is necessary to first move the shaping part 5 laterally to make the shaping part 5 fit with the hoof surface 101, and then use the hot pressing equipment to move the middle mold 3 downward. At this time, vertical relative movement occurs between the shaping part 5 and the middle mold 3, and the inner wall of the feeding slot hole 301 fits with the shaping part 5 and holds the shaping part 5 in place, which facilitates the molding of the end face of the friction plate 6.

[0053] Furthermore, when the friction plate 6 is pressed, the hot pressing pressure is 180 kg / cm 2 .

[0054] Furthermore, when the friction plate 6 is pressed, the temperature of the upper mold 4 is 160°C, and the temperature of the lower mold 2 is 140°C.

[0055] Furthermore, when the friction plate 6 is pressed, the holding temperature is 3 minutes. The friction plate 6 is hot-pressed by the above method. During the hot-pressing step of the friction plate 6, the friction plate 6 can be bonded and fixed to the shoe surface 101 of the brake shoe 1 to form a brake shoe assembly, and the shear strength can reach 2.0-2.5MPa.

[0056] Furthermore, after the friction plate 6 is hot-pressed, the upper mold 4 and the middle mold 3 are driven to move upward by the hot-pressing device until the shaping portion 5 is below the middle mold 3, and the shaping portion 5 is manually moved to keep the shaping portion 5 away from the friction plate 6, thereby not blocking the middle mold 3 from continuing to move upward. After the upper mold 4 and the middle mold 3 are demolded, the brake shoe 1 assembly is removed from the lower mold 2, and the demolding of the brake shoe 1 assembly is completed.

[0057] It should be noted that although the present invention is disclosed as above by specific embodiments, the above embodiments are not intended to limit the present invention. Ordinary technicians in this field can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention shall be based on the scope defined in the claims.

Claims

1. A new type of preparation mold for a rivet-free brake shoe assembly, the brake shoe assembly comprising a brake shoe and a friction plate, the brake shoe comprising a shoe surface and a tendon fixed to the shoe surface, the friction plate being fixed to the shoe surface, characterized in that: The mold preparation comprises: A lower mold, wherein a plurality of fixing grooves are formed on the top surface of the lower mold, a pair of supporting parts are provided in the fixing grooves, the pair of supporting parts are provided on both sides of the tendon of the brake shoe assembly to be prepared, and the pair of supporting parts are supported on the bottom surfaces of the corresponding shoe surfaces; A middle mold, wherein a plurality of through-feeding slots are provided on the top surface of the middle mold, wherein the feeding slots are arranged in one-to-one correspondence with the plurality of fixing slots, and the bottom of the middle mold is pressed against the corresponding shoe surface so that the shoe surface blocks the bottom end of the feeding slots; The upper mold has a bottom surface provided with a pressing block corresponding to the feeding slot hole one by one, and the pressing block blocks the top of the feeding slot hole; wherein the feeding slot hole and the pressing block cooperate with the corresponding shoe surface to form a molding cavity with a shape consistent with the friction plate.

2. The preparation mold of the novel rivetless brake shoe assembly according to claim 1 is characterized in that: The height of the pair of support portions is set so that the bottom of the brake shoe does not contact the bottom surface of the fixing groove.

3. The preparation mold of the novel rivetless brake shoe assembly according to claim 1 is characterized in that: A plurality of fixing grooves are arranged on both sides of the lower mold and are symmetrically arranged.

4. The preparation mold for the novel rivetless brake shoe assembly according to claim 1 is characterized in that: It also includes a shaping part arranged on both sides of the top of the shoe surface, and the shaping part is provided with a first shaping surface for forming the end face of the friction plate; an L-shaped connecting rod is fixed on the top of the shaping part, and a sliding rod is fixed on the L-shaped connecting rod, and a vertical sliding groove cooperating with the sliding rod is opened on the inner wall of the feeding trough hole, and a horizontal sliding groove cooperating with the sliding rod is opened at the bottom of the middle mold, and the vertical sliding groove is connected with its corresponding horizontal sliding groove.

5. The preparation mold for the novel rivetless brake shoe assembly according to claim 4 is characterized in that: The bottom of the shaping portion fits the hoof surface.

6. A method for preparing a novel rivetless brake shoe assembly, based on the preparation mold described in any one of claims 1 to 5, characterized in that: The following steps are involved: S1. Install the prepared mold on a hot pressing device; S2, fixing the brake shoe between a pair of the supporting parts; S3, using the hot pressing equipment to install the middle mold on the hoof surface; S4, feeding friction powder into the feeding slot; S5. The upper mold moves downward to press the friction plate.

7. The method for preparing the novel rivetless brake shoe assembly according to claim 6 is characterized in that: When pressing the friction plate, the hot pressing pressure is 180kg / cm 2 .

8. The method for preparing the novel rivetless brake shoe assembly according to claim 6 is characterized in that: When the friction plate is pressed, the temperature of the upper mold is 160°C and the temperature of the lower mold is 140°C.

9. The method for preparing the novel rivetless brake shoe assembly according to claim 6, characterized in that: When the friction plate is pressed, the pressure maintaining temperature is 3 minutes.

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