Thickening extrusion device and method capable of avoiding bulging

Abstract

The invention relates to an extrusion thickness device and method for avoiding bulging, and belongs to the field of shell material machining. Through control of a first driving part and a second driving part, it can be ensured that an upper die assembly and a lower die assembly extrude the top and the bottom of a to-be-machined workpiece; the side wall of a to-be-machined workpiece can be extruded through cooperation of the first driving part and the side wall thickness extruding assembly, so that the to-be-machined workpiece is fixed, then the side wall thickness extruding assembly can evenly extrude the side wall of the workpiece under driving of the second driving part, the thickness of the side wall of the workpiece is gradually increased, and the machining efficiency is improved. Therefore, the strength and stability of the workpiece are improved; the clamping force of the upper die assembly and the lower die assembly on the workpiece to be machined can be increased through the material pressing assembly, the friction force between the lower die assembly and the workpiece to be machined can be increased through the protruding part, and therefore the phenomenon that the workpiece to be machined is bulged when the side wall of the workpiece to be machined is extruded to be thick is avoided.

Description

Technical Field

[0001] The invention relates to the technical field of shell material processing, and more particularly to a thickening device and method for avoiding drumming. Background Art

[0002] With the continuous progress of society and the continuous development of communication technology, the application of laptops and mobile phones is becoming more and more common, and people's requirements for laptops are also increasing. At present, the side walls of traditional laptop shells and mobile phone shells mostly need to be extruded and thickened. During the extrusion and thickening process, the clamping force of the lower mold assembly and the upper mold assembly may be insufficient to clamp the product, resulting in drumming on the shell, resulting in unqualified parts, which may need to be reprocessed or scrapped, thereby increasing material costs. Summary of the invention

[0003] The technical problem to be solved by the present invention is that during the extrusion process, the clamping force of the lower mold assembly and the upper mold assembly may be insufficient to clamp the product, resulting in bulging on the shell, causing unqualified parts, which may need to be reprocessed or scrapped, thereby increasing material costs. In view of the above-mentioned defects of the prior art, an extrusion device and method for avoiding bulging are provided.

[0004] The technical solution adopted by the present invention to solve its technical problem is:

[0005] A lower die assembly of a thickening device for avoiding drumming is constructed; it includes a material pressing assembly arranged at the bottom of the lower die assembly for applying an upward lifting force to the lower die assembly, and a convex portion for increasing the friction between the lower die assembly and a workpiece to be processed is arranged on the top of the lower die assembly;

[0006] An upper die assembly, comprising a first driving member disposed above the upper die assembly, the first driving member being used to drive the upper die assembly to move toward the lower die assembly and cooperate with the lower die assembly to clamp the top and bottom of a workpiece to be processed;

[0007] A side fixing assembly, the side fixing assembly is arranged on the outer side of the lower die assembly, the outer side of the lower die assembly is provided with a side guide block which cooperates with the first driving member to move the side fixing assembly toward the workpiece to be processed so as to press the side wall of the workpiece to be processed against the side wall of the lower die assembly, and the bottom of the side guide block is provided with an elastic pushing member;

[0008] A side wall extrusion component is provided with a second driving member at the bottom thereof, and the side wall extrusion component can be driven by the second driving member to extrude the side wall of the workpiece to be processed upward, so that the thickness of the side wall of the workpiece to be processed gradually increases.

[0009] Optionally, the pressing component may be a first nitrogen spring, and the first driving component may be a hydraulic component.

[0010] Optionally, the elastic pushing member may be a second nitrogen spring.

[0011] Optionally, a side of the side fixing member close to the workpiece to be processed is provided with an avoidance groove to prevent the side fixing member from colliding with the upper mold assembly, and a side of the side fixing member away from the workpiece to be processed is provided with a first inclined surface.

[0012] Optionally, a second inclined surface matched with the first inclined surface is provided on a side of the side guide block close to the side fixing member, and the first inclined surface is parallel to the second inclined surface.

[0013] Optionally, the side wall extrusion assembly includes an assembly block and an extrusion block detachably connected to one side of the assembly block, and an extrusion portion is protruding from the top of the extrusion block.

[0014] Optionally, the upper mold assembly includes an upper top plate, an upper middle plate and an upper bottom plate which are arranged in sequence from top to bottom, and the upper bottom plate acts on the top of the workpiece to be processed.

[0015] Optionally, the lower mold assembly includes a lower top plate for supporting the workpiece to be processed, the upper bottom plate cooperates with the lower top plate to clamp the front and back sides of the workpiece to be processed, a lower middle plate assembly is arranged on the outer side of the lower top plate, a lower bottom plate assembly is arranged below the lower middle plate, a first through hole is arranged on the lower bottom plate assembly, a second through hole is arranged on the lower bottom plate assembly and the lower middle plate assembly, and the side wall extrusion assembly is arranged above the lower middle plate assembly.

[0016] Optionally, the first nitrogen spring includes a first cylinder body and a first plunger, and the second nitrogen spring includes a second cylinder body and a second plunger, the first cylinder body is arranged at the bottom of the lower base plate assembly, the first plunger is penetrated into the first through hole and connected to the bottom of the lower base plate, the second cylinder body is arranged at the bottom of the lower base plate assembly, the second plunger is penetrated into the second through hole and connected to the bottom of the side guide block.

[0017] A method for applying a thickening device to avoid drumming comprises the following steps:

[0018] S1. Place the workpiece to be processed on the lower die assembly, and drive the upper die assembly to move toward the lower die assembly through the first driving member so that the upper die assembly and the lower die assembly cooperate to clamp the workpiece to be processed. At this time, the protrusion will act on the inner side of the workpiece to be processed to prevent the workpiece to be processed from being horizontally displaced, and the pressing assembly acts on the lower die assembly to increase the clamping force of the upper die assembly and the lower die assembly when clamping the workpiece to be processed;

[0019] S11. The upper die assembly presses down the side fixing assembly, and the side fixing assembly contacts the side guide block and moves toward the workpiece to be processed under the guidance of the side guide block to press the side wall of the workpiece to be processed against the side wall of the lower die;

[0020] S2. The second driving member is started, and the second driving member drives the side wall thickening assembly to extrude the side wall of the workpiece to be processed upward, so that the thickness of the side wall of the workpiece to be processed gradually increases.

[0021] The beneficial effects of the present invention are:

[0022] 1. The present invention can ensure that the upper die assembly and the lower die assembly squeeze the top and bottom of the workpiece to be processed through the control of the first driving member and the second driving member, and the side wall of the workpiece to be processed can be squeezed through the cooperation of the first driving member and the side wall thickening assembly, so as to fix the workpiece to be processed, and then under the drive of the second driving member, the side wall thickening assembly can evenly squeeze the side wall of the workpiece, so that the thickness of the side wall of the workpiece is gradually increased, thereby improving the strength and stability of the workpiece;

[0023] 2. The clamping force of the upper die assembly and the lower die assembly on the workpiece to be processed can be increased by providing a pressing assembly, and the friction between the lower die assembly and the workpiece to be processed can be increased by the raised portion, thereby avoiding the occurrence of drumming of the workpiece to be processed when the side wall of the workpiece to be processed is squeezed and thickened. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the present invention will be further described below in conjunction with the accompanying drawings and embodiments. The drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work:

[0025] Figure 1 It is an overall axonometric schematic diagram of the present invention.

[0026] Figure 2 It is an overall side schematic diagram of the present invention.

[0027] Figure 3 The present invention is Figure 2 Schematic diagram of the cross section taken along line BB.

[0028] Figure 4 It is another side schematic diagram of the present invention.

[0029] Figure 5 The present invention is Figure 4 Schematic diagram of the cross section taken along the CC line.

[0030] Figure 6The present invention Figure 5 An enlarged schematic diagram of part A.

[0031] Figure 7 It is an overall exploded schematic diagram of the present invention.

[0032] Figure 8 The present invention Figure 7 An enlarged schematic diagram of part B.

[0033] The accompanying drawings are marked as follows:

[0034] 100, lower die assembly; 110, pressing assembly; 111, first cylinder; 112, first plunger; 120, lower top plate; 130, lower middle plate assembly; 131, lower middle plate body; 132, first receiving groove; 140, lower bottom plate assembly; 141, lower bottom plate body; 142, second receiving groove; 150, first through hole; 160, second through hole; 200, upper die assembly; 201, upper top plate; 202, upper middle plate; 2 03, upper base plate; 300, side fixing assembly; 310, avoidance groove; 320, first inclined surface; 400, side wall thickening assembly; 410, assembly block; 420, thickening block; 421, thickening portion; 500, side guide block; 510, elastic pusher; 511, second cylinder body; 512, second plunger; 520, second inclined surface; 600, second driving member; 700, workpiece to be processed; 701, side wall of workpiece to be processed. DETAILED DESCRIPTION

[0035] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the drawings of the present invention. Obviously, the described embodiments are 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] In the description of the embodiments of the present application, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present application can be understood according to specific circumstances.

[0037] In the embodiments of the present application, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0038] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the embodiments of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0039] Embodiments of the present invention Figure 1-Figure 8As shown in the figure, it relates to an extrusion device for avoiding drumming, including a lower die assembly 100, an upper die assembly 200, a side fixing assembly 300, and a side wall extrusion assembly 400; the lower die assembly 100 includes a pressing assembly 110 arranged at the bottom of the lower die assembly 100 for applying an upward lifting force to the lower die assembly 100, and the top of the lower die assembly 100 is provided with a protrusion for increasing the friction between the lower die assembly 100 and the workpiece 700 to be processed; the upper die assembly 200 includes a first driving member (not shown in the figure) arranged above the upper die assembly 200, and the first driving member is used to drive the upper die assembly 200 toward the lower die assembly 100. The side fixing assembly 300 is arranged on the outer side of the lower mold assembly 100, and the outer side of the lower mold assembly 100 is provided with a side guide block 500 which cooperates with the first driving member to displace the side fixing assembly 300 toward the workpiece 700 to be processed and press the side wall of the workpiece 700 to be processed against the side wall of the lower mold assembly 100, and the bottom of the side guide block 500 is provided with an elastic pushing member 510; the bottom of the side wall extrusion assembly 400 is provided with a second driving member 600, and the side wall extrusion assembly 400 can be driven by the second driving member 600 to move the workpiece 700 to be processed upward. 0, so that the thickness of the side wall of the workpiece 700 to be processed gradually increases. Further, the present invention can ensure that the upper mold assembly 200 and the lower mold assembly 100 squeeze the top and bottom of the workpiece 700 to be processed through the control of the first driving member and the second driving member 600. The side wall of the workpiece 700 to be processed can be squeezed by the cooperation of the first driving member and the side wall thickening assembly 400, so as to fix the workpiece 700 to be processed. Subsequently, under the drive of the second driving member 600, the side wall thickening assembly 400 can uniformly squeeze the side wall of the workpiece, so that the thickness of the side wall of the workpiece gradually increases, thereby improving the strength and stability of the workpiece. The pressure assembly 110 can increase the clamping force of the upper mold assembly 200 and the lower mold assembly 100 on the workpiece 700 to be processed, and the friction between the lower mold assembly 100 and the workpiece 700 to be processed can be increased by the raised portion, thereby avoiding the drumming phenomenon of the workpiece 700 to be processed when the side wall of the workpiece 700 to be processed is thickened, wherein the raised portion is provided in plurality and can be a convex column with a sharp end, and the sharp end can be inserted into the shallow surface of the workpiece 700 to be processed to increase the friction between the lower mold assembly 100 and the workpiece 700 to be processed. In some embodiments, the raised portion is provided in plurality and can be granular, and the second driving member 600 can be a cylinder or a hydraulic press.

[0040] See also Figure 1-Figure 7In this embodiment, the pressing component 110 may be a first nitrogen spring, the first driving component may be a hydraulic component, and the elastic pushing member 510 may be a second nitrogen spring. Compared with ordinary springs, the nitrogen spring can provide a greater and more stable force. The stable elastic force can ensure that the material remains stable during the production process to prevent movement or shaking, thereby improving the quality and precision of the product. The hydraulic driver converts liquid pressure energy into mechanical energy through a hydraulic pump, and its energy transfer efficiency is relatively high, which can meet the power requirements of the pressing device. The hydraulic device may be a hydraulic press.

[0041] In this embodiment, the side fixing member is provided with a avoidance groove 310 on the side close to the workpiece 700 to be processed to prevent the side fixing member from colliding with the upper mold assembly 200, and the side fixing member is provided with a first inclined surface 320 on the side away from the workpiece 700 to be processed. The side guide block 500 is provided with a second inclined surface 520 adapted to the first inclined surface 320 on the side close to the side fixing member, and the first inclined surface 320 is parallel to the second inclined surface 520. Specifically, the existence of the avoidance groove 310 can effectively prevent the side fixing member from colliding with the upper mold assembly 200. In the process of closing or mechanical operation, the upper mold assembly 200 collides with the upper mold assembly 200, thereby avoiding damage to the mold or the machine and preventing impact on product quality and production efficiency. The first inclined surface 320 set on the side of the side fixing member away from the workpiece 700 to be processed, and the second inclined surface 520 matched with the first inclined surface 320 set on the side of the side guide block 500 close to the side fixing member, together constitute a precise guide assembly, thereby ensuring that during the assembly and operation of the mold, the side fixing member can be positioned toward the workpiece 700 to be processed, thereby squeezing the side wall of the workpiece 700 to be processed.

[0042] See also Figure 1-Figure 7 In this embodiment, a mounting plate is provided at the bottom of the side wall extrusion assembly 400, and the side wall extrusion assembly 400 includes an assembly block 410 and an extrusion block 420 detachably connected to one side of the assembly block 410, and an extrusion portion 421 is convexly provided on the top of the extrusion block 420. Specifically, the assembly block 410 and the extrusion block 420 are detachably connected, and the extrusion block 420 can be replaced in time when the extrusion block 420 is excessively worn. The extrusion block 420 is one of the core components of the side wall extrusion assembly 400, and the extrusion portion 421 thereon can extrude the side wall of the workpiece through a specific shape and structure, thereby achieving the effect of side wall extrusion, wherein the detachable connection method can be a threaded connection.

[0043] In this embodiment, the upper mold assembly 200 includes an upper top plate 201, an upper middle plate 202 and an upper bottom plate 203 which are arranged in sequence from top to bottom. The upper bottom plate 203 acts on the top of the workpiece 700 to be processed. The top plate transfers the pressure to the upper bottom plate 203 through the upper middle plate 202, and then acts on the workpiece, ensuring that the pressure is evenly distributed inside the mold, thereby improving processing efficiency and product quality.

[0044] See also Figure 1-Figure 8 In this embodiment, the lower mold assembly 100 includes a lower top plate 120 for carrying the workpiece 700 to be processed, the upper bottom plate 203 cooperates with the lower top plate 120 to clamp the front and back sides of the workpiece 700 to be processed, a lower middle plate assembly 130 is arranged on the outer side of the lower top plate 120, a lower bottom plate assembly 140 is arranged below the lower middle plate, a first through hole 150 is arranged on the lower bottom plate assembly 140, and a second through hole 160 is arranged on the lower bottom plate assembly 140 and the lower middle plate assembly 130. Further, the first nitrogen spring includes a first cylinder 111 and a first plunger 112, and the first The nitrogen gas spring includes a second cylinder 511 and a second plunger 512. The first cylinder 111 is arranged at the bottom of the lower base plate assembly 140. The first plunger 112 is penetrated in the first through hole 150 and connected to the bottom of the lower base plate. The second cylinder 511 is arranged at the bottom of the lower base plate assembly 140. The second plunger 512 is penetrated in the second through hole 160 and connected to the bottom of the side guide block 500. The side wall extrusion assembly 400 is arranged above the lower middle plate assembly 130. Specifically, when the side wall extrusion assembly 400 extrudes the side wall of the workpiece 700 to be processed, During the extrusion, the side wall of the workpiece 700 to be processed will push the side fixing part away from the workpiece 700 to be processed while thickening, so that the second plunger 512 drives the side guide block 500 to move slightly downward to prevent the side wall of the workpiece from failing to thicken. The upper bottom plate 203 cooperates with the lower top plate 120 to stably clamp the front and back sides of the workpiece 700 to be processed, thereby ensuring the stability of the workpiece during the processing. The existence of the lower bottom plate assembly 140 and the lower middle plate assembly 130 helps to disperse the pressure inside the mold. This design reduces the force strength of a single component, thereby extending the service life of the mold. Optionally, the lower middle plate assembly 130 includes two lower middle plate bodies 131 arranged from top to bottom, and a first accommodating groove 132 is provided at the bottom of the middle plate body of the two lower middle plate bodies 131 close to the lower bottom plate assembly 140, and the lower bottom plate assembly 140 includes two lower bottom plate bodies 141 arranged from top to bottom, and a second accommodating groove 142 is provided on the lower bottom plate body 141 close to the lower middle plate, and the first accommodating groove 132 is opposite to the second accommodating groove 142, and the second driving member 600 is arranged in the first accommodating groove 132 and the second accommodating groove 142.

[0045] An application method of a thickening device for avoiding drumming comprises the following steps:

[0046] S1. Place the workpiece 700 to be processed on the lower mold assembly 100, and drive the upper mold assembly 200 to move toward the lower mold assembly 100 through the first driving member so that the upper mold assembly 200 and the lower mold assembly 100 cooperate to clamp the workpiece 700 to be processed. At this time, the protrusion will act on the inner side of the workpiece 700 to prevent the workpiece 700 from being horizontally displaced. The pressing assembly 110 acts on the lower mold assembly 100 to increase the clamping force of the upper mold assembly 200 and the lower mold assembly 100 when clamping the workpiece 700 to be processed; drive the upper mold assembly 200 to move toward the lower mold assembly 100 through the first driving member so that the upper mold assembly 200 and the lower mold assembly 100 cooperate to clamp the workpiece 700 to be processed. This design ensures the stability of the workpiece during the processing and avoids processing errors caused by movement or deformation of the workpiece. The protrusion acts on the inner side of the workpiece 700 to be processed, effectively preventing the workpiece from being horizontally displaced during the processing. This design improves the accuracy and reliability of processing, ensures the quality of the workpiece, and the inner side of the workpiece 700 to be processed will not be exposed to the outside after assembly is completed, which does not affect the aesthetics of the workpiece.

[0047] S11. The upper die assembly 200 presses down the side fixing assembly 300, and the side fixing assembly 300 contacts the side guide block 500 and moves toward the workpiece 700 to be processed under the guidance of the side guide block 500, pressing the side wall of the workpiece 700 to be processed against the side wall of the lower die; thereby fixing the side wall of the workpiece 700 to be processed;

[0048] S2. The second driving member 600 is started, and the second driving member 600 drives the side wall thickening assembly 400 to squeeze the side wall of the workpiece 700 to be processed upward, so that the thickness of the side wall of the workpiece 700 to be processed gradually increases.

[0049] It should be understood that those skilled in the art can make improvements or changes based on the above description, and all these improvements and changes should fall within the scope of protection of the appended claims of the present invention.

Claims

1. A device for preventing drumming from causing thickening, characterized in that: include: A lower die assembly (100) comprises a material pressing assembly (110) arranged at the bottom of the lower die assembly (100) for applying an upward lifting force to the lower die assembly (100); a protrusion is arranged at the top of the lower die assembly (100) for increasing the friction between the lower die assembly (100) and a workpiece (700) to be processed; An upper die assembly (200) comprises a first driving member arranged above the upper die assembly (200), the first driving member being used to drive the upper die assembly (200) to move toward the lower die assembly (100) and to cooperate with the lower die assembly (100) to clamp the top and bottom of a workpiece (700) to be processed; a side fixing assembly (300), the side fixing assembly (300) being arranged on the outer side of the lower die assembly (100), the outer side of the lower die assembly (100) being provided with a side guide block (500) which cooperates with the first driving member to move the side fixing assembly (300) toward the workpiece (700) to be processed so as to press the side wall of the workpiece (700) to be processed against the side wall of the lower die assembly (100), and the bottom of the side guide block (500) being provided with an elastic pushing member (510); A side wall thickening component (400) is provided at the bottom of the side wall thickening component (400), and the side wall thickening component (400) can be driven by the second driving component (600) to squeeze the side wall of the workpiece to be processed (700) upward, so that the thickness of the side wall of the workpiece to be processed (700) gradually increases.

2. A device for preventing drumming according to claim 1, characterized in that: The material pressing component (110) is a first nitrogen spring, and the first driving component is a hydraulic component.

3. A device for preventing drumming according to claim 2, characterized in that: The elastic pushing member (510) is a second nitrogen spring.

4. A device for preventing drumming from occurring according to claim 1, characterized in that: A side of the side fixing member close to the workpiece to be processed (700) is provided with an avoidance groove (310) for preventing the side fixing member from colliding with the upper mold assembly (200), and a side of the side fixing member away from the workpiece to be processed (700) is provided with a first inclined surface (320).

5. The device for preventing drumming from occurring according to claim 3 is characterized in that: A second inclined surface (520) adapted to the first inclined surface (320) is provided on one side of the side guide block (500) close to the side fixing member, and the first inclined surface (320) is parallel to the second inclined surface (520).

6. A device for preventing drumming according to claim 3, characterized in that: The side wall thickening assembly (400) comprises an assembly block (410) and an extrusion block (420) detachably connected to one side of the assembly block (410), and an extrusion portion (421) is protruding from the top of the extrusion block (420).

7. A device for preventing drumming according to claim 6, characterized in that: The upper mold assembly (200) comprises an upper top plate (201), an upper middle plate (202) and an upper bottom plate (203) which are arranged in sequence from top to bottom, and the upper bottom plate (203) acts on the top of the workpiece (700) to be processed.

8. The device for preventing drumming from occurring according to claim 7, characterized in that: The lower mold assembly (100) includes a lower top plate (120) for supporting the workpiece (700) to be processed, the upper bottom plate (203) cooperates with the lower top plate (120) to clamp the front and back sides of the workpiece (700) to be processed, a lower middle plate assembly (130) is arranged on the outer side of the lower top plate (120), a lower bottom plate assembly (140) is arranged below the lower middle plate, a first through hole (150) is arranged on the lower bottom plate assembly (140), a second through hole (160) is arranged on the lower bottom plate assembly (140) and the lower middle plate assembly (130), and the side wall extrusion assembly (400) is arranged above the lower middle plate assembly (130).

9. A device for preventing drumming according to claim 8, characterized in that: The first nitrogen spring comprises a first cylinder body (111) and a first plunger (112); the second nitrogen spring comprises a second cylinder body (511) and a second plunger (512); the first cylinder body (111) is arranged at the bottom of the lower base plate assembly (140); the first plunger (112) is inserted into the first through hole (150) and connected to the bottom of the lower base plate; the second cylinder body (511) is arranged at the bottom of the lower base plate assembly (140); the second plunger (512) is inserted into the second through hole (160) and connected to the bottom of the side guide block (500).

10. An application method of the thickening device for avoiding drumming as claimed in any one of claims 1 to 9, characterized in that: The following steps are involved: S1. The workpiece (700) to be processed is placed on the lower die assembly (100), and the upper die assembly (200) is driven by the first driving member to move toward the lower die assembly (100) so that the upper die assembly (200) and the lower die assembly (100) cooperate to clamp the workpiece (700) to be processed. At this time, the protrusion will act on the inner side of the workpiece (700) to prevent the workpiece (700) to be processed from being horizontally displaced, and the pressing assembly (110) acts on the lower die assembly (100) to increase the clamping force of the upper die assembly (200) and the lower die assembly (100) when clamping the workpiece (700) to be processed; S11. The upper mold assembly (200) presses down the side fixing assembly (300), and the side fixing assembly (300) contacts the side guide block (500) and moves toward the workpiece to be processed (700) under the guidance of the side guide block (500) to press the side wall of the workpiece to be processed (700) against the side wall of the lower mold; S2. The second driving member (600) is started, and the second driving member (600) drives the side wall thickening component (400) to squeeze the side wall of the workpiece (700) to be processed upward, so that the thickness of the side wall of the workpiece (700) to be processed gradually increases.

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