CN108162478A - A kind of drum-type brake pad heat pressing and molding mold and technique - Google Patents

Abstract

In order to solve the problems of complex manufacturing process and low production efficiency of drum brake pads, the invention provides a drum brake pad hot pressing mold and process, by adding a cavity plate between the upper mold and the lower mold, the lower cavity plate The end surface is equipped with a lower arc surface that can fit the upper arc surface of the shoe, which makes the overall production process of the brake pad simpler. After the shoe is fixed, the mold is pressed downward, and the friction block can be hot-pressed and bonded with the shoe. Fixed, compared with the previous production process of separately producing friction blocks, cutting, and final bonding of inner arcs, this mold and process greatly reduces the production time of brake pads, facilitates the processing and circulation of parts in the production process, and increases work efficiency.

Description

A kind of hot pressing forming mold and process of drum brake pad

technical field

The invention relates to the technical field of brake pad production, in particular to a drum brake pad hot-press forming mold and process.

Background technique

Drum brake pads are composed of two parts: shoe and friction block. The two need to be firmly combined. The existing production process is to separately press the long friction block, and then cut it into a single width according to the width required by the finished product. For small friction blocks, the drum brake pad mold using this process can only produce long strip friction blocks. After the long strip friction blocks are pressed, they need to be cut into small pieces according to the width required by the product, and then small pieces The friction block is then ground, bonded or riveted to complete the complete product combined with the shoe. In addition to pressing, the entire process requires cutting, grinding the inner arc, bonding or riveting. The process is cumbersome and each The process requires a lot of manpower and material resources, takes up a lot of space, the production efficiency is not high, and the quality of the process is not easy to control.

Contents of the invention

In order to solve the problems of complex manufacturing process and low production efficiency of drum brake pads, the invention provides a drum brake pad thermoforming mold and process. The specific technical scheme is as follows:

A drum-type brake pad hot-press forming die, comprising an upper die and a lower die, is characterized in that: it also includes a mold cavity,

Upper mold: including a template and several dies fixed on the bottom end of the upper template for forming the outer arc surface of the friction block;

Mold cavity: including a cavity plate provided with several cavities for forming the friction block of the brake pad and guide sleeves located at both ends of the cavity plate, the lower end surface of the cavity plate is bent downward and can be connected to the upper surface of the shoe For the lower arc surface where the arc surface fits, the cavity corresponds to the concave mold one by one. The length and width of the single cavity are the same as those of the friction block of the drum brake pad. Several holes for placing heating wires or heating rods;

Lower mold: including the lower template, the guide pillars fixed at both ends of the lower template and matched with the guide sleeves on the mold cavity, and several shoes located on the upper surface of the lower template corresponding to the cavity one by one and used to fix the shoes. piece,

After the upper template descends and closes the mold cavity plate, the gap between the lower arc surface of the die, the upper arc surface of the shoe and the two sides in the cavity forms the friction block of the drum brake pad. At the same time, the equipment Heating makes the friction block and the shoe better combined, and the drum brake pad is pressed into shape in one step.

Further, the number of mold cavities on the mold cavity plate ranges from one cavity to fifty cavities.

Further, the die is detachably fixedly connected to the lower end surface of the upper template.

Furthermore, bolts are used between the die and the upper template.

Further, the shoe positioning block is detachably and fixedly connected to the top of the lower formwork.

Furthermore, bolts are used between the shoe positioning block and the lower formwork.

Utilize the above-mentioned drum brake pad thermoforming die to produce the thermocompression molding process of drum brake pad, it is characterized in that, comprises the following steps:

1) Put the shoe whose upper surface is coated with glue and the length and width of the shoe is larger than the length and width of the cavity into the shoe positioning block for positioning;

2) The cavity plate goes down, so that the lower arc surface of the cavity plate fully fits the upper arc surface of the shoe, and a certain clamping force is added to seal the mold;

3) Add the prepared mixture for forming the friction block into the cavity of the mold cavity, and spread the mixture evenly;

4) The equipment drives the upper mold to drive the concave mold downward, so that the distance between the concave mold and the shoe is gradually reduced until the mixture is compressed to the required thickness, and after a certain period of time, the pressure is maintained and the air is released;

5) The equipment first drives the concave die upward, and then drives the cavity plate upward to take out the products left in the lower die.

The beneficial effects of the invention are:

1. The connection between the die and the upper template, shoe positioning block and the lower template is detachable, which is convenient for replacement during the production of products of different specifications or when the die and shoe positioning block are damaged;

2. The length and width of the hoof are greater than the length and width of the cavity on the cavity plate to prevent the mixture in the cavity from flowing out during hot pressing;

3. In the actual production of this mold, the compound material is added to one-time compression molding, which saves a lot of processing procedures, achieves high efficiency, energy saving, saving, and reduces costs. Due to fewer procedures, it is easier to control product quality and higher processing efficiency. The original very cumbersome production process has become very simple, which reduces the storage and circulation of semi-finished products in each process, greatly reduces the site occupation, and is conducive to large-scale production.

Description of drawings

Figure 1 is a schematic diagram of the overall structure of the hot press molding die for drum brake pads

Figure 2 is a schematic diagram of the cavity structure of the drum brake pad thermoforming mold

Figure 3 is a schematic diagram of the cooperation of the die, the cavity and the shoe when the drum brake pad thermoforming mold is closed

Wherein, 1-upper template, 2-guide sleeve, 3-guide post, 4-shoe positioning block, 5-lower template, 6-shoe, 7-cavity plate, 8-concave die.

The present invention will be described in further detail below in conjunction with accompanying drawings 1-3 and embodiments.

As shown in Figure 1-3, the drum brake pad thermoforming mold mainly consists of three parts: the upper mold, the lower mold and the mold cavity. Among them, the upper mold part is mainly composed of the upper mold plate 1 and 16 fixed on the bottom end surface of the upper mold plate 1. It is composed of a die 8 for forming the outer arc surface of the drum brake pad friction block. The die 8 and the upper template 1 are connected by bolts and the lower surface is a lower arc surface curved downward. The cavity part is mainly composed of 16 A cavity plate 7 corresponding to the die 8 and used to form the cavity of the brake pad friction block and guide sleeves 2 located at both ends of the cavity plate 7, the lower surface of the cavity plate 7 is a downward curved arc. On the surface, the length and width dimensions of the single cavity are the same as those of the drum brake pads, and 5 holes for placing heating wires are arranged in the cavity wall; the lower mold part is mainly fixed by the lower template 5, The guide pillars 3 at both ends of the lower formwork 5 and matched with the guide sleeves 2 on the mold cavity, and the 16 shoe positioning blocks 4 located on the upper end surface of the lower formwork 5 and the cavity on the cavity plate 7 correspond one-to-one. The iron positioning block 4 is connected to the upper surface of the lower template 5 by bolts, and the upper arc surface of the shoe 6 matched with the shoe positioning block 4 has the same size as the lower arc surface of the cavity plate 7, which can be fully fitted. The length and width are greater than the length and width of the cavity to prevent the mixture from leaking during the molding process. When the upper mold plate is clamped, the gap between the lower arc surface of the die 8 and the upper arc surface of the shoe 6 and the two sides of the cavity Forms the pad portion of a drum brake pad.

Utilize the above-mentioned drum brake pad thermocompression forming die to produce the thermocompression forming process of drum brake pad, comprising the following steps:

1) Put the shoe whose upper surface is coated with glue and the length and width of the shoe is larger than the length and width of the cavity into the shoe positioning block for positioning;

2) The cavity plate goes down, so that the lower arc surface of the cavity plate fully fits the upper arc surface of the shoe, and a certain clamping force is added to seal the mold;

3) Add the prepared mixture for forming the friction block into the cavity of the mold cavity, and spread the mixture evenly;

4) The equipment drives the upper mold to drive the concave mold downward, so that the distance between the concave mold and the shoe is gradually reduced until the mixture is compressed to the required thickness, and after a certain period of time, the pressure is maintained and the air is released;

5) The equipment first drives the concave die upward, and then drives the cavity plate upward to take out the products left in the lower die.

When working, the shoe is put into the lower mold part, the mold cavity goes down to seal the mold, the mixture is added, the upper mold is pressed down, the pressure is maintained, and the air is released. After completion, the upper mold goes up, the mold cavity goes up to open the mold, and the product is taken out manually The entire product pressing process can be completed, the production process is simplified, the production procedure is reduced, and the production efficiency is greatly improved.

The above is only a preferred embodiment of the invention. It should be pointed out that for those of ordinary skill in the art, some improvements can be made without departing from the principle of the invention, and these improvements should also be regarded as the protection of the invention. scope.

Claims (7)

1. a kind of drum-type brake pad heat pressing and molding mold, including upper die and lower die, it is characterised in that：Further include die cavity,

Upper mold：Cope plate bottom end face is fixed on for being molded the cavity plate of brake pad extrados with several including template；

Die cavity：Including being equipped with several for the mold cavity plate of the cavity of formed brake plate brake pad part and positioned at mold cavity plate both ends Guide sleeve, the mold cavity plate lower face is the lower camber side that is bent downwardly and can be bonded with cambered surface on shoes, the cavity with Cavity plate corresponds, and the length and width dimensions of the single cavity are identical with the length and width dimensions of drum-type brake pad brake pad, the die cavity It is used to place the hole of heating wire or heating rod in wall body equipped with several；

Lower die：Including lower template, be fixed on lower template both ends and with the matched guide post of guide sleeve on die cavity and several positions It is corresponded in lower template upper surface and cavity and is used to fix the shoes locating piece of shoes.

2. drum-type brake pad heat pressing and molding mold according to claim 1, which is characterized in that the mold cavity plate upper cavity Quantity is a chamber to 50 chambers.

3. drum-type brake pad heat pressing and molding mold according to claim 1, which is characterized in that the cavity plate is removably solid Surely it is connected to the lower face of cope plate.

4. drum-type brake pad heat pressing and molding mold according to claim 3, which is characterized in that the cavity plate and cope plate it Between be connected by screw bolts.

5. drum-type brake pad heat pressing and molding mold according to claim 1, which is characterized in that the shoes locating piece is removable That unloads is fixedly connected on above lower template.

6. drum-type brake pad heat pressing and molding mold according to claim 5, which is characterized in that the shoes locating piece is under It is connected by screw bolts between template.

7. using the drum-type brake pad hot press forming technology of drum-type brake pad heat pressing and molding mold as described in claim 1, It is characterized in that, includes the following steps：

1）, upper surface is coated with to viscose glue and shoe plate length is wider than the shoes of cavity length and width and is put into shoes locating piece and positions；

2）, mold cavity plate downlink, mold cavity plate lower camber side is made fully to be bonded with cambered surface on shoes, and add certain mold clamping force carry out envelope mould；

3）, added in the cavity of die cavity prepared for being molded the mixture of brake pad, and it is uniform to spread out material；

4）, device drives upper mold so as to drive cavity plate downlink, be gradually reduced distance between cavity plate and shoes, until compression mixing Material, by the pressurize of certain time, is deflated to the thickness of requirement；

5）, equipment first drive cavity plate uplink, then drive mold cavity plate uplink, take out and stay in the product of part of the lower die.