CN211135217U - A mold structure that improves mold clamping rate and mold double-piece protection - Google Patents

Abstract

The utility model relates to a mold structure which improves the mold clamping rate and the protection of the mold double-material sheets, which comprises an upper mold frame, a lower mold frame, an upper mold forming block, a lower mold forming block and an elastic component. An elastic component is fixed on the upper end surface of the lower mold base, the upper mold base is arranged above the lower mold forming blocks, and a plurality of upper mold forming blocks are arranged on the lower end surface of the upper mold base and correspond to the lower mold forming blocks one-to-one. The beneficial effect of the utility model is that the elastic components are used to make each lower mold forming block float. When a certain lower mold forming block of the mold wears, the elastic component will automatically compensate for the wear amount and lift the entire lower mold forming block. In order to ensure the coloring rate of the mold surface and the quality of the product; when foreign objects fall into the mold or when there are double-material stamping, since the entire lower mold forming block is floating, once a foreign object or double-material is punched, the elastic component will be compressed to avoid Rigid contact, thus protecting the mold from being crushed.

Description

A mold structure that improves mold clamping rate and mold double-piece protection

technical field

The utility model relates to the field of automobile manufacturing, in particular to a mold structure which improves the mold clamping rate and protects the mold with double material pieces.

Background technique

In automobile manufacturing, there are various body parts with different shapes. Among them, the body-in-white assembly plate is complex in shape, high in strength and hardness, and has a large quantity demand. Therefore, in order to complete the order with high quality and quantity, it is necessary to rely on high-tonnage hydraulic presses. Stamping dies are used to produce the required parts. This production method has stable product quality and high production efficiency, which can well meet the needs of the automotive market.

Most of the current molds, in order to consider factors such as production cost and production efficiency, are preferentially processed into the form of one mold with multiple cavities (with multiple lower mold forming blocks), and each cavity is locked on the lower mold base at the same time. Such a stamping can produce multiple parts, but due to the different mold cavities in the production process, with the increase of output and the accumulation of time, different degrees of mold cavity wear will occur, which will cause the mold to be in stamping production. When the mold is closed, the gap between the upper and lower molds is different, so that the upper and lower molds of a certain cavity in the mold do not fit together, and the coloring becomes worse, which affects the quality of the product.

At this stage of die stamping, the problem of mold clamping rate that affects product quality is generally solved by re-finishing the overall surface of the upper and lower mold forming blocks or adding or removing gaskets for local forming blocks. This method is time-consuming and labor-intensive. The cost is high and the actual effect is not ideal.

In addition, during the current stamping production, there is a very small probability (about 1 in 10,000) that there will be foreign objects (such as screws) or double blanks in the mold being stamped. All are designed with electromagnetic induction detection devices to ensure that each manipulator grabs a piece of material for punching, but this problem still occurs. Once it occurs, the light will damage the upper and lower mold blocks, and the heavy will lead to fracturing and deformation of the casting mold, or even scrapping the mold, resulting in a lot of waste, project schedule delay, and supply chain breakage.

Utility model content

The technical problem to be solved by the utility model is to provide a mold structure that improves the mold clamping rate and the protection of the mold double-material, so as to overcome the deficiencies in the above-mentioned prior art.

The technical solution of the utility model to solve the above-mentioned technical problems is as follows: a mold structure for improving the mold clamping rate and the protection of the mold double-material sheet, including an upper mold frame, a lower mold frame, an upper mold forming block, a lower mold forming block and an elastic component, and more Each of the lower mold blocks is fixed on the upper end surface of the lower mold base through at least one elastic component, the upper mold base is arranged above the lower mold block, and a plurality of upper mold blocks are arranged on the lower end surface of the upper mold base, and are connected with the lower mold base. One-to-one correspondence of modular blocks.

The beneficial effect of the utility model is: the elastic components are used to make each lower mold forming block float, and when a certain lower mold forming block of the mold wears, the elastic component will automatically compensate for the amount of wear, and lift the entire lower mold forming block. In order to ensure the coloring rate of the mold surface and the quality of the product; in addition, when foreign objects fall into the mold or when there are double-material stamping, since the entire lower mold forming block is floating, once a foreign object or double-material is punched, the elastic component will be compressed. , to avoid the contact of steel, so as to protect the mold from being crushed, improve the mold clamping rate, improve the production efficiency of parts, reduce the repair rate, and reduce the mold debugging time and debugging cost.

On the basis of the above technical solutions, the utility model can also be improved as follows.

In the above solution, the elastic component includes a plurality of disc spring components, and the lower mold forming block is fixed on the upper end surface of the lower mold base through the plurality of disc spring components.

In the above solution, the elastic component further includes a forming block backing plate, the forming block backing plate is fixed on the upper end surface of the lower mold base through a plurality of disc spring assemblies, and the lower mold forming block is arranged on the upper end surface of the forming block backing plate.

In the above solution, the disc spring assembly includes a height screw and a plurality of disc springs, a through hole is provided on the backing plate of the forming block, a threaded hole is provided on the lower mold base, and the threaded end of the equal height screw passes through the through hole and is connected to the lower The threaded holes on the mold base are screwed together, and a plurality of disc springs are stacked between the backing plate of the forming block and the lower mold base.

In the above solution, the disc springs located between the backing plate of the forming block and the lower mold base are all sleeved on the screws of equal height.

In the above solution, a plurality of disc springs are stacked between the head of the equal-height screw and the upper end surface of the backing plate of the forming block, and the discs located between the head of the equal-height screw and the upper end surface of the backing plate of the forming block The springs are all set on the equal height screws.

The beneficial effects of adopting the above-mentioned further optimization scheme are: through the ultra-high elasticity, stability, and stackability of the disc spring, the lower mold blocks are all floating, which effectively avoids the rigid contact between the upper mold block and the lower mold block, and protects the The mold is not damaged, the structure is simple, the function is stable and reliable, and it is easy to realize.

In the above solution, the number of disc springs in the elastic component is 40, and the elastic force of the disc springs is 2T.

The beneficial effect of adopting the above-mentioned further optimization scheme is that the stamping and forming requirements of general parts can be met.

In the above solution, a guide assembly is also included, and a plurality of guide assemblies are arranged between the backing plate of the forming block and the lower mold frame.

In the above solution, the number of guide assemblies provided between the forming block backing plate and the lower mold base is four, and the four guiding assemblies are respectively located at the four corners of the forming block backing plate.

In the above solution, the guide assembly includes a guide post and a guide sleeve, the guide post is arranged on the backing plate of the forming block, the guide sleeve is arranged on the lower die frame, and the guide post is movably inserted into the guide sleeve.

In the above solution, the guide assembly further includes a guide sleeve pressure plate, the guide sleeve pressure plate is fixed on the lower mold frame, and the guide sleeve is pressed on the lower mold frame by the guide sleeve pressure plate.

The beneficial effect of adopting the above-mentioned further optimization scheme is that the up and down floating of the lower mold forming block can be guided to ensure the forming accuracy of the product.

Description of drawings

Fig. 1 is the structural representation of the mould structure that improves mould clamping rate and mould double material protection according to the utility model;

Fig. 2 is the partial structural schematic diagram of the mold structure for improving mold clamping rate and mold double-material protection according to the present invention;

FIG. 3 is an enlarged view of a partial structure of FIG. 1 .

In the accompanying drawings, the list of components represented by each number is as follows:

1. Upper mold base, 2. Lower mold base, 3. Upper mold forming block, 4. Lower mold forming block, 5. Elastic assembly, 510, Forming block backing plate, 520, Disc spring assembly, 521, Contour screws, 522, disc spring, 6, guide assembly, 610, guide post, 620, guide sleeve, 630, guide sleeve pressure plate.

Detailed ways

The principles and features of the present invention will be described below with reference to the accompanying drawings, and the examples are only used to explain the present invention, and are not intended to limit the scope of the present invention.

Example 1

As shown in Figures 1 and 2, a mold structure for improving mold clamping rate and mold double-material protection includes an upper mold base 1, a lower mold base 2, an upper mold forming block 3, a lower mold forming block 4 and an elastic component 5 , the plurality of lower mold blocks 4 are each fixed on the upper end surface of the lower mold base 2 through at least one elastic component 5, and the number of the lower mold blocks 4 set on the lower mold base 2 can be two, three, four, Five, etc., each lower molding block 4 can be fixed on the upper end surface of the lower mold base 2 through one, two, three, four or other numbers of elastic components 5, and the upper mold base 1 is arranged on the lower molding block Above 4 , a plurality of upper mold forming blocks 3 are arranged on the lower end surface of the upper mold base 1 and correspond to the lower mold forming blocks 4 one-to-one.

Under normal circumstances, the upper die set 1 is fixed on the upper slider of the press. During production, the upper die forming block 3 and the upper die set 1 perform the upper and lower punching action with the slide block on the press, while the lower die set 2 Fixed on the table under the press.

Example 2

As shown in Figures 1 and 2, a mold structure for improving mold clamping rate and mold double-material protection includes an upper mold base 1, a lower mold base 2, an upper mold forming block 3, a lower mold forming block 4 and an elastic component 5 , the plurality of lower mold blocks 4 are each fixed on the upper end surface of the lower mold base 2 through at least one elastic component 5, and the number of the lower mold blocks 4 set on the lower mold base 2 can be two, three, four, Five, etc., each lower molding block 4 can be fixed on the upper end surface of the lower mold base 2 through one, two, three, four or other numbers of elastic components 5, and the upper mold base 1 is arranged on the lower molding block Above 4 , a plurality of upper mold forming blocks 3 are arranged on the lower end surface of the upper mold base 1 and correspond to the lower mold forming blocks 4 one-to-one.

The elastic assembly 5 includes a plurality of disc spring assemblies 520, and the lower molding block 4 is fixed on the upper end surface of the lower mold base 2 through the plurality of disc spring assemblies 520.

Example 3

As shown in Figures 1 and 2, a mold structure for improving mold clamping rate and mold double-material protection includes an upper mold base 1, a lower mold base 2, an upper mold forming block 3, a lower mold forming block 4 and an elastic component 5 , the plurality of lower mold blocks 4 are each fixed on the upper end surface of the lower mold base 2 through at least one elastic component 5, and the number of the lower mold blocks 4 set on the lower mold base 2 can be two, three, four, Five, etc., each lower molding block 4 can be fixed on the upper end surface of the lower mold base 2 through one, two, three, four or other numbers of elastic components 5, and the upper mold base 1 is arranged on the lower molding block Above 4 , a plurality of upper mold forming blocks 3 are arranged on the lower end surface of the upper mold base 1 and correspond to the lower mold forming blocks 4 one-to-one.

The elastic assembly 5 includes a plurality of disc spring assemblies 520, and the lower molding block 4 is fixed on the upper end surface of the lower mold base 2 through the plurality of disc spring assemblies 520.

The elastic component 5 further includes a forming block backing plate 510, the forming block backing plate 510 is fixed on the upper end surface of the lower mold base 2 through a plurality of disc spring assemblies 520, and the lower mold forming block 4 is arranged on the upper end surface of the forming block backing plate 510, The forming block backing plate 510 can be fixed on the upper end surface of the lower mold base 2 by two, three, four, five, six and other numbers of disc spring assemblies 520. Normally, all the disc spring assemblies 520 are annular Arrangement, and the arrangement is preferably symmetrical.

Example 4

As shown in Figure 1, Figure 2, Figure 3, a mold structure for improving mold clamping rate and mold double-material protection includes an upper mold base 1, a lower mold base 2, an upper mold forming block 3, a lower mold forming block 4 and Elastic assembly 5, a plurality of lower mold forming blocks 4 are each fixed on the upper end surface of the lower mold base 2 through at least one elastic assembly 5, and the number of the lower mold forming blocks 4 set on the lower mold base 2 can be two, three, Four, five, etc., each lower mold block 4 can be fixed on the upper end surface of the lower mold base 2 by one, two, three, four or other numbers of elastic components 5, and the upper mold base 1 is arranged on the lower Above the molding block 4 , a plurality of upper molding blocks 3 are arranged on the lower end surface of the upper mold base 1 and correspond to the lower molding blocks 4 one-to-one.

The elastic assembly 5 includes a plurality of disc spring assemblies 520, and the lower molding block 4 is fixed on the upper end surface of the lower mold base 2 through the plurality of disc spring assemblies 520.

The elastic component 5 further includes a forming block backing plate 510, the forming block backing plate 510 is fixed on the upper end surface of the lower mold base 2 through a plurality of disc spring assemblies 520, and the lower mold forming block 4 is arranged on the upper end surface of the forming block backing plate 510, The forming block backing plate 510 can be fixed on the upper end surface of the lower mold base 2 by two, three, four, five, six and other numbers of disc spring assemblies 520. Normally, all the disc spring assemblies 520 are annular Arrangement, and the arrangement is preferably symmetrical.

The disc spring assembly 520 includes a height screw 521 and a plurality of disc springs 522. The forming block backing plate 510 is provided with a through hole, and the lower mold base 2 is provided with a threaded hole. The screw holes on the lower mold base 2 are screwed together, and a plurality of disc springs 522 are stacked between the forming block backing plate 510 and the lower mold base 2 . The disc springs 522 located between the backing plate 510 of the forming block and the lower mold base 2 are preferably all sleeved on the screws 521 of equal height.

In addition, a plurality of disc springs 522 are stacked between the head of the equal-height screw 521 and the upper end surface of the forming block backing plate 510, and are located between the head of the equal-height screw 521 and the upper end surface of the forming block backing plate 510 The disc springs 522 are preferably all sleeved on the equal height screws 521.

Example 5

As shown in Figure 1, Figure 2, Figure 3, a mold structure for improving mold clamping rate and mold double-material protection includes an upper mold base 1, a lower mold base 2, an upper mold forming block 3, a lower mold forming block 4 and Elastic assembly 5, a plurality of lower mold forming blocks 4 are each fixed on the upper end surface of the lower mold base 2 through at least one elastic assembly 5, and the number of the lower mold forming blocks 4 set on the lower mold base 2 can be two, three, Four, five, etc., each lower mold block 4 can be fixed on the upper end surface of the lower mold base 2 by one, two, three, four or other numbers of elastic components 5, and the upper mold base 1 is arranged on the lower Above the molding block 4 , a plurality of upper molding blocks 3 are arranged on the lower end surface of the upper mold base 1 and correspond to the lower molding blocks 4 one-to-one.

The elastic assembly 5 includes a plurality of disc spring assemblies 520, and the lower molding block 4 is fixed on the upper end surface of the lower mold base 2 through the plurality of disc spring assemblies 520.

The elastic component 5 further includes a forming block backing plate 510, the forming block backing plate 510 is fixed on the upper end surface of the lower mold base 2 through a plurality of disc spring assemblies 520, and the lower mold forming block 4 is arranged on the upper end surface of the forming block backing plate 510, The forming block backing plate 510 can be fixed on the upper end surface of the lower mold base 2 by two, three, four, five, six and other numbers of disc spring assemblies 520. Normally, all the disc spring assemblies 520 are annular Arrangement, and the arrangement is preferably symmetrical.

The disc spring assembly 520 includes a height screw 521 and a plurality of disc springs 522. The forming block backing plate 510 is provided with a through hole, and the lower mold base 2 is provided with a threaded hole. The screw holes on the lower mold base 2 are screwed together, and a plurality of disc springs 522 are stacked between the forming block backing plate 510 and the lower mold base 2 . The disc springs 522 located between the backing plate 510 of the forming block and the lower mold base 2 are preferably all sleeved on the screws 521 of equal height.

In addition, a plurality of disc springs 522 are stacked between the head of the equal-height screw 521 and the upper end surface of the forming block backing plate 510, and are located between the head of the equal-height screw 521 and the upper end surface of the forming block backing plate 510 The disc springs 522 are preferably all sleeved on the equal height screws 521.

Usually the press adopts 1000T press,

Disc spring 522 model: MISUMI SSRBN50-B, different bearing capacity models can be selected according to requirements, and different quantities can be used according to the size of the forming force of the parts. Generally, a disc spring 522 provides a force of about 2T, and each lower mold block 4 passes through An elastic component 5 is fixed on the lower mold base 2, and the number of disc springs 522 in each elastic component 5 is 30 to 50, which can provide a force of 60 to 100T, which is sufficient for the stamping and forming force of general parts. : CSR25-50 (selected with disc spring), when the mold is assembled, the stroke of the disc spring 522 is 1.1mm, and the preload is 0.1mm when locking to ensure that the disc spring 522 can provide pressure during stamping production.

Example 6

As shown in Figure 1, Figure 2, Figure 3, a mold structure for improving mold clamping rate and mold double-material protection includes an upper mold base 1, a lower mold base 2, an upper mold forming block 3, a lower mold forming block 4 and Elastic assembly 5, a plurality of lower mold forming blocks 4 are each fixed on the upper end surface of the lower mold base 2 through at least one elastic assembly 5, and the number of the lower mold forming blocks 4 set on the lower mold base 2 can be two, three, Four, five, etc., each lower mold block 4 can be fixed on the upper end surface of the lower mold base 2 by one, two, three, four or other numbers of elastic components 5, and the upper mold base 1 is arranged on the lower Above the molding block 4 , a plurality of upper molding blocks 3 are arranged on the lower end surface of the upper mold base 1 and correspond to the lower molding blocks 4 one-to-one.

The elastic assembly 5 includes a plurality of disc spring assemblies 520, and the lower molding block 4 is fixed on the upper end surface of the lower mold base 2 through the plurality of disc spring assemblies 520.

The elastic component 5 further includes a forming block backing plate 510, the forming block backing plate 510 is fixed on the upper end surface of the lower mold base 2 through a plurality of disc spring assemblies 520, and the lower mold forming block 4 is arranged on the upper end surface of the forming block backing plate 510, The forming block backing plate 510 can be fixed on the upper end surface of the lower mold base 2 by two, three, four, five, six and other numbers of disc spring assemblies 520. Normally, all the disc spring assemblies 520 are annular Arrangement, and the arrangement is preferably symmetrical.

The disc spring assembly 520 includes a height screw 521 and a plurality of disc springs 522. The forming block backing plate 510 is provided with a through hole, and the lower mold base 2 is provided with a threaded hole. The screw holes on the lower mold base 2 are screwed together, and a plurality of disc springs 522 are stacked between the forming block backing plate 510 and the lower mold base 2 . The disc springs 522 located between the backing plate 510 of the forming block and the lower mold base 2 are preferably all sleeved on the screws 521 of equal height.

In addition, a plurality of disc springs 522 are stacked between the head of the equal-height screw 521 and the upper end surface of the forming block backing plate 510, and are located between the head of the equal-height screw 521 and the upper end surface of the forming block backing plate 510 The disc springs 522 are preferably all sleeved on the equal height screws 521.

Usually the press adopts 1000T press,

Disc spring 522 model: MISUMI SSRBN50-B, different bearing capacity models can be selected according to requirements, and different quantities can be used according to the size of the forming force of the parts. Generally, a disc spring 522 provides a force of about 2T, and each lower mold block 4 passes through An elastic component 5 is fixed on the lower mold base 2, and the number of disc springs 522 in each elastic component 5 is 30 to 50, which can provide a force of 60 to 100T, which is sufficient for the stamping and forming force of general parts. : CSR25-50 (selected with disc spring), when the mold is assembled, the stroke of the disc spring 522 is 1.1mm, and the preload is 0.1mm when locking to ensure that the disc spring 522 can provide pressure during stamping production.

The mold structure for improving mold clamping rate and mold double-material protection also includes guide assemblies 6 , a plurality of guide assemblies 6 are arranged between the forming block backing plate 510 and the lower mold base 2 , and between the forming block backing plate 510 and the lower mold base 2 . The number of the guide assemblies 6 provided is preferably four, and the four guide assemblies 6 are respectively located at the four corners of the forming block backing plate 510 .

The guide assembly 6 includes a guide post 610 and a guide sleeve 620. The guide post 610 is arranged on the forming block backing plate 510, the lower mold frame 2 is provided with a mounting hole, and the guide sleeve 620 is arranged in the mounting hole on the lower mold frame 2, and the guide The post 610 is movably inserted into the guide sleeve 620 .

The guide assembly 6 further includes a guide sleeve pressing plate 630 , the guide sleeve pressing plate 630 is fixed on the lower mold frame 2 , and the guide sleeve 620 is pressed on the lower mold frame 2 by the guide sleeve pressing plate 630 .

Principle of action: It mainly uses the characteristics of high elasticity, small stroke and stackable use of the disc spring 522 to lift the lower mold block 4 of the entire mold, and relies on the disc spring 522 to pre-lift a distance during the stamping production process to compensate for the lower part. The wear amount of the die-forming blocks 4, so as to achieve the complete coloring of multiple lower die-forming blocks 4 in one punch, to ensure the stable quality of the parts produced; The rigid contact protects the die from damage due to over-pressing.

How to use: According to the actual required forming force of the part, select the appropriate type of disc spring 522 and the number of disc springs to be used, or multiple disc springs 522 can be used in layers.

① In the processing and manufacturing stage, the disc spring 522 does not need to be installed, and is processed after being fixed;

②In the stage of mold assembly, select the appropriate type and quantity of disc spring 522, and use appropriate equal-height screws 521 to lock, so that the disc spring 522 can generate a certain pre-compression force, which can ensure that the disc spring 522 is used in the whole stamping production. are involved in the work;

③Stamping production:

Action process: the upper mold base 1 and the upper mold forming block 3 descend with the upper slider of the press → the upper mold forming block 3 contacts the lower mold forming block 4 → the molding process starts → the upper mold base 1 and the upper mold forming block 3 continue to descend →A part of the disc spring 522 is compressed by force →The molding process is finished →Pressure is maintained, and the disc spring 522 is in a compressed state (the magnitude of this force meets the weight of the lower molding block 4, the weight of the molding block backing plate 510, and the parts required for molding Sum of force) → the upper slider of the press returns, the upper mold frame 1 and the upper mold block 3 go up → the disc spring 522 pushes up the lower mold block 4 to the initial preload state of the disc spring 522 → the stamping is completed.

Although the embodiments of the present invention have been shown and described above, it should be understood that the above embodiments are exemplary and should not be construed as limitations of the present invention, and those of ordinary skill in the art are within the scope of the present invention Variations, modifications, substitutions and variations can be made to the above-described embodiments.

Claims (6)

1. The mold structure capable of improving the mold closing rate and protecting the double material sheets of the mold is characterized by comprising an upper mold frame (1), a lower mold frame (2), upper mold forming blocks (3), lower mold forming blocks (4) and elastic assemblies (5), wherein the lower mold forming blocks (4) are fixed on the upper end face of the lower mold frame (2) through at least one elastic assembly (5), the upper mold frame (1) is arranged above the lower mold forming blocks (4), and the upper mold forming blocks (3) are arranged on the lower end face of the upper mold frame (1) and correspond to the lower mold forming blocks (4) one to one;

the elastic assembly (5) comprises a plurality of disc spring assemblies (520), and the lower die forming block (4) is fixed on the upper end face of the lower die frame (2) through the plurality of disc spring assemblies (520);

the elastic assembly (5) further comprises a forming block base plate (510), the forming block base plate (510) is fixed on the upper end face of the lower die frame (2) through a plurality of disc spring assemblies (520), and the lower die forming block (4) is arranged on the upper end face of the forming block base plate (510);

the die-casting mould is characterized by further comprising a guide assembly (6), wherein a plurality of guide assemblies (6) are arranged between the forming block base plate (510) and the lower mould frame (2);

the guide assembly (6) comprises a guide post (610) and a guide sleeve (620), the guide post (610) is arranged on the forming block base plate (510), the guide sleeve (620) is arranged on the lower die frame (2), and the guide post (610) is movably inserted into the guide sleeve (620).

2. The mold structure capable of improving the mold closing rate and protecting the double material sheets of the mold according to claim 1, wherein the disc spring assembly (520) comprises an equal-height screw (521) and a plurality of disc springs (522), a through hole is formed in the forming block base plate (510), a threaded hole is formed in the lower mold frame (2), a threaded end of the equal-height screw (521) penetrates through the through hole and then is screwed with the threaded hole in the lower mold frame (2), and the disc springs (522) are stacked between the forming block base plate (510) and the lower mold frame (2).

3. The mold structure for improving mold closing rate and protecting the double material sheets of the mold according to claim 2, wherein the disc springs (522) between the forming block base plate (510) and the lower mold frame (2) are all sleeved on the equal-height screws (521).

4. The mold structure for improving the mold closing rate and the protection of the mold double material sheets according to claim 2, wherein a plurality of disc springs (522) are stacked between the head of the contour screw (521) and the upper end face of the molding block base plate (510), and the disc springs (522) positioned between the head of the contour screw (521) and the upper end face of the molding block base plate (510) are all sleeved on the contour screw (521).

5. The mold structure for improving mold closing rate and mold double-material sheet protection according to claim 1, wherein the number of the guide assemblies (6) arranged between the molding block backing plate (510) and the lower mold frame (2) is four, and the four guide assemblies (6) are respectively arranged at four corners of the molding block backing plate (510).

6. The mold structure for improving the clamping rate and protecting the double material sheets of the mold according to claim 1, wherein the guide assembly (6) further comprises a guide sleeve pressing plate (630), the guide sleeve pressing plate (630) is fixed on the lower mold frame (2), and the guide sleeve (620) is pressed on the lower mold frame (2) through the guide sleeve pressing plate (630).

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