Punching die for deep hole flanging of thin plate

Abstract

The utility model discloses a stamping die for deep hole flanging of a thin plate. The stamping die comprises an upper die and a lower die, the upper die comprises an upper die base, an upper material pressing plate and a hole flanging punching needle. The hole flanging punching needle is fixed to the upper die base and is in transition fit with the upper material pressing plate through a through hole formed in the upper material pressing plate. The lower die comprises a lower spring, a pressing ejector pin and a punch-die; the pressing ejector pin is in clearance fit with the punch-die through a through hole formed in the punch-die. When the die provided by the utility model is used for processing a product with a deep hole flanging, the tail end of the hole flanging of the product is chamfered, the end surface is free from fine crushing and cracking, the edge is smooth, the subsequent polishing process is not needed, and the product quality and the production efficiency are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of stamping dies, in particular to a thin plate deep-hole stamping die. Background Art

[0002] In the manufacturing process of automobile parts, the drilling process is required. For example, drilling is required on components such as the engine block and crankcase to install valves, oil channels and other components to ensure the normal operation and performance of the engine. The chassis structure is complex, and drilling is also required on various components to install key components such as the suspension system and the braking system to ensure the stability and safety of the car. During the processing of deep drilling of thin plates, the internal stress is large, especially during the deformation of metal plates, which can easily lead to local stress concentration and deformation of the drilling end face, thereby causing fine cracking of the edges. Cracks on the drilling edge will affect the functional performance of the parts, such as causing deformation or deformation of the holes, affecting the installation and connection of parts, and even affecting the normal operation of the entire system. Therefore, additional grinding or cutting processes are required to repair it, which undoubtedly increases the production cycle and cost and reduces production efficiency. Summary of the invention

[0003] Since the depth of the hole often causes fine cracking and uneven edges on the end faces of the holes when processing deep-hole products, the utility model aims to provide a thin plate deep-hole punching die, which is used to prevent fine cracking on the end faces of the parts when the holes are punched, thereby improving product quality and production efficiency.

[0004] The purpose of the utility model is achieved through the following technical solutions:

[0005] A thin plate deep hole punching die, comprising an upper die and a lower die;

[0006] The upper die comprises an upper die base 1, an upper blank pressing plate 4 and a punching needle 5; the punching needle 5 is fixed on the upper die base 1 and transitionally matched with the upper blank pressing plate 4 through a through hole provided in the upper blank pressing plate 4;

[0007] The lower die comprises a lower spring 8 , a pressing pin 9 and a male and female die 13 ; the pressing pin 9 is clearance-matched with the male and female die 13 through a through hole provided in the male and female die 13 .

[0008] Furthermore, the upper die also includes an upper die fixing plate 2, a die 3 and an upper spring 7; the upper die fixing plate 2 is fixed on the upper die base 1; the die 3 is fixed on the upper die fixing plate 2, and a self-lubricating guide sleeve 6 is provided in the die 3.

[0009] Furthermore, the lower die also includes a lower die base 10, a lower die fixing plate 11, a push plate 12, and a guide column 14; the lower die fixing plate 11 is installed on the lower die base 10; the self-lubricating guide sleeve 6 provided on the die 3 is clearance-matched with the guide column 14, and the push plate 12 is fixed above the lower die fixing plate 11, and moves upward when the mold is opened to unload.

[0010] Furthermore, the lower end of the punching needle 5 has a cone, and the cone angle is 60°.

[0011] Furthermore, the lower end of the pressing pin 9 is connected to the lower spring 8, and the upper end of the pressing pin 9 is a circular plane structure, which cooperates with the conical structure at the lower end of the punching needle 5 to press the sheet material.

[0012] Furthermore, the male and female dies 13 are fixed on the lower die fixing plate 11, and the clearance between them and the ejector pin 9 is 0.1 mm.

[0013] Furthermore, the upper end portion of the through hole of the male and female molds 13 is provided with a cylindrical step structure with a chamfer, and the angle between the chamfer and the horizontal plane is 45°.

[0014] Compared with the prior art, one or more embodiments of the present invention may have the following advantages:

[0015] The utility model realizes chamfering of the end of the hole of the workpiece when processing the deep-hole-turned products, and at the same time, the end face has no fine cracks and the edge is smooth, and no subsequent grinding process is required, thereby improving product quality and production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a closed cross-section of a sheet metal deep-hole punching die;

[0017] Figure 2 This is the parts diagram of the punching pin in the sheet metal deep punching die;

[0018] Figure 3 It is a partial cross-sectional view of the male and female dies in the sheet metal deep hole punching die;

[0019] Figure 4 This is a cross-sectional view of the start of punching in a sheet metal deep punching die;

[0020] In the figure:

[0021] 1-upper die seat, 2-upper die fixing plate, 3-die, 4-upper pressing plate, 5-flanging punch, 6-self-lubricating guide sleeve, 7-upper spring, 8-lower spring, 9-pressing ejector pin, 10-lower die seat, 11-lower die fixing plate, 12-push plate, 13-convex and concave dies, 14-guide column. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical solution and advantages of the present invention more clear, the implementation mode of the present invention will be further described in detail below in conjunction with embodiments and drawings.

[0023] like Figure 1 The figure shows the closed cross-sectional structure of a sheet metal deep punching die, including an upper die and a lower die;

[0024] The upper die comprises an upper die base 1, an upper blank pressing plate 4 and a punching needle 5; the punching needle 5 is fixed on the upper die base 1 and transitionally matched with the upper blank pressing plate 4 through a through hole provided in the upper blank pressing plate 4;

[0025] The lower die comprises a lower spring 8 , a pressing pin 9 and a male and female die 13 ; the pressing pin 9 is clearance-matched with the male and female die 13 through a through hole provided in the male and female die 13 .

[0026] The upper die also includes an upper die fixing plate 2, a die 3 and an upper spring 7; the upper die fixing plate 2 is fixed on the upper die base 1; the die 3 is fixed on the upper die fixing plate 2, and a self-lubricating guide sleeve 6 is provided in the die 3.

[0027] The above-mentioned lower die also includes a lower die base 10, a lower die fixing plate 11, a push plate 12, and a guide column 14; the lower die fixing plate 11 is installed on the lower die base 10; the self-lubricating guide sleeve 6 provided on the die 3 is in clearance fit with the guide column 14, and the guide column 14 moves in the self-lubricating guide sleeve 6; the push plate 12 is fixed above the lower die fixing plate 11, and moves upward when the mold is opened to play a role in unloading.

[0028] The lower end of the punching needle 5 has a cone, and the cone angle is 60° (such as Figure 2 shown).

[0029] The lower end of the above-mentioned pressing pin 9 is connected to the lower spring 8, and the upper end of the pressing pin 9 is a circular plane structure. The circular plane cooperates with the conical structure of the lower end of the punch 5 to press the sheet material and slow down the metal flow speed of the sheet material. The sheet material moves downward at the same time as the punch 5 and the pressing pin 9 to complete the punching, preventing the hole edge from cracking.

[0030] The male and female dies 13 are fixed on the lower die fixing plate 11, and the clearance between them and the ejector pin 9 is 0.1 mm.

[0031] like Figure 3 As shown, it is a partial cross-sectional view of the male and female dies in the thin plate deep hole punching die. The upper end part of the through hole of the male and female dies 13 is provided with a cylindrical step structure with a chamfer, and the angle between the chamfer and the horizontal plane is 45°; the downward movement stroke of the hole punching needle has a certain limit, which works together with the cylindrical step structure with a chamfer to form a chamfer structure at the end of the hole punching of the sheet.

[0032] The implementation process of the above embodiment is as follows:

[0033] When the mold starts to close, Figure 4 As shown, the punch needle 5 moves downward to contact the sheet material, the lower end of the pressing pin 9 is connected to the lower spring 8, and the upper end is a circular plane structure. The circular plane cooperates with the conical structure at the lower end of the punch needle 5 to press the sheet material. The lower spring 8 is compressed to slow down the metal flow speed of the sheet material, and the sheet material moves downward simultaneously with the punch needle 5 and the punch needle 9.

[0034] When the mold is closed, Figure 1 As shown, the downward movement of the punch needle 5 has a certain limit, and its movement to the limit works together with the chamfered cylindrical step structure to form a chamfered structure at the end of the punching hole of the sheet material, thereby achieving a smooth edge without fine cracks on the end face.

[0035] Although the implementation methods disclosed in the utility model are as above, the above contents are only the implementation methods adopted for facilitating the understanding of the utility model, and are not used to limit the utility model. Any technician in the technical field to which the utility model belongs can make any modifications and changes in the form and details of the implementation without departing from the spirit and scope disclosed in the utility model, but the scope of patent protection of the utility model shall still be based on the scope defined in the attached claims.

Claims

1. A thin plate deep punching die, characterized in that: The mold comprises an upper mold and a lower mold; The upper die comprises an upper die base (1), an upper blank pressing plate (4) and a punching needle (5); the punching needle (5) is fixed on the upper die base (1) and transitionally matched with the upper blank pressing plate (4) through a through hole provided in the upper blank pressing plate (4); The lower die comprises a lower spring (8), a material pressing pin (9) and a male and female die (13); the material pressing pin (9) is clearance-matched with the male and female die (13) through a through hole opened in the male and female die (13).

2. The sheet metal deep punching die according to claim 1, characterized in that: The upper die also comprises an upper die fixing plate (2), a concave die (3) and an upper spring (7); the upper die fixing plate (2) is fixed on the upper die base (1); the concave die (3) is fixed on the upper die fixing plate (2), and a self-lubricating guide sleeve (6) is provided in the concave die (3).

3. The sheet metal deep punching die according to claim 2, characterized in that: The lower die also includes a lower die base (10), a lower die fixing plate (11), a push plate (12), and a guide column (14); the lower die fixing plate (11) is installed on the lower die base (10); the self-lubricating guide sleeve (6) provided on the concave die (3) is clearance-matched with the guide column (14); the push plate (12) is fixed above the lower die fixing plate (11) and moves upward when the die is opened to discharge the material.

4. The sheet metal deep punching die according to claim 1, characterized in that: The lower end of the punching needle (5) is provided with a cone, and the angle of the cone is 60°.

5. The sheet metal deep punching die according to claim 4, characterized in that: The lower end of the pressing pin (9) is connected to the lower spring (8), and the upper end of the pressing pin (9) is a circular plane structure. The circular plane cooperates with the conical structure at the lower end of the punching pin (5) to press the sheet material.

6. The sheet metal deep punching die according to claim 1, characterized in that: The male and female dies (13) are fixed on the lower die fixing plate (11), and the clearance between them and the ejector pin (9) is 0.1 mm.

7. The sheet metal deep punching die according to claim 1, characterized in that: The upper end portion of the through hole of the male and female molds (13) is provided with a cylindrical step structure with a chamfer, and the angle between the chamfer and the horizontal plane is 45 degrees.

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