Cold stamping method and device for local thickening of plate

Abstract

The present invention relates to a cold stamping method and device for local thickening of a plate material, the method comprising: a punching process: punching a base plate material to form a punching hole; a flanging process: flanging the punching hole so that the edge of the punching hole is bent in a direction perpendicular to the surface of the base plate material to form a hole-shaped flange on the surface of the base plate material; a thickening process: extruding the hole-shaped flange to form a hole-shaped protrusion of a required thickness, the required thickness of the hole-shaped protrusion being greater than the thickness of the base plate material and less than the height of the hole-shaped flange. Only by performing the punching-flanging-thickening stamping process on the base plate material, the local thickening of the base plate material is achieved, the production efficiency is high, and the forming area is formed by die stamping, so the dimensional accuracy of the product is very high and the consistency is very good. In addition, the entire stamping method can be carried out at room temperature, so that the mechanical properties of the material can be kept consistent before and after processing.

Description

Technical Field

[0001] The invention relates to the technical field of stamping production and manufacturing, and in particular to a cold stamping method and device for locally thickening a plate. Background Art

[0002] The local thickness of some metal sheet products is required to be thicker than the thickness of the base plate. The reason is that the local strength requirement of the parts is high or the assembly and installation contact surface is large. A typical local thickening product is Figure 1 As shown, the thickness of the outer contour 2 at the opening 1 of the product is thicker than that in other areas. This structure with a thickness difference on the same product brings certain difficulties to processing and manufacturing.

[0003] At present, the traditional processing methods for metal sheet products with thickness difference are generally casting, forging or machining. The cast products have poor toughness, severe deformation and rough surface, and the casting is seriously polluting, with a long process chain, high product waste rate and high manufacturing cost. The forging method is inefficient and the product precision is low. In order to meet the tolerance requirements of the product, reprocessing is usually required, which is time-consuming, labor-intensive and has high manufacturing cost. The machining method requires a larger blank, which takes a long time to process, wastes raw materials, is inefficient and has high cost. Summary of the invention

[0004] The purpose of the present invention is to provide a cold stamping method and device for local thickening of a plate, which solves the various drawbacks of traditional processing and manufacturing methods for processing products with thickness differences of metal sheets.

[0005] To achieve the above object, the present invention provides a cold stamping method for local thickening of a plate, comprising:

[0006] Punching process: punching the base sheet to form punching holes;

[0007] Hole-turning process: performing hole-turning at the punching hole so that the edge of the punching hole is bent in a direction perpendicular to the surface of the base plate to form a hole-shaped flange on the surface of the base plate;

[0008] Thickening process: extruding the hole-shaped flange to form a hole-shaped protrusion of required thickness, wherein the required thickness of the hole-shaped protrusion is greater than the thickness of the base plate material and less than the height of the hole-shaped flange.

[0009] Optionally, the base plate is punched by a punching assembly to form a punching hole, the punching assembly comprising a punching die, a first upper die seat and a punch, and the specific steps of the punching process include:

[0010] Placing the base plate on the punching die;

[0011] Driving the first upper die seat to press against the base plate;

[0012] The punch is driven to punch the base plate material in a direction perpendicular to the surface of the base plate material to form the punching hole.

[0013] Optionally, a punching assembly is used to punch holes at the punching holes, the punching assembly includes a punching punch, a first lower die seat and a second upper die seat, and the specific steps of the punching process include:

[0014] Placing the punched base plate on the first lower die seat;

[0015] Driving the second upper die seat to press against the punched base plate;

[0016] The punching punch is driven to align with the punching hole to punch so that the edge of the punching hole is bent in a direction perpendicular to the surface of the base plate material to form a hole-shaped flange on the surface of the base plate material.

[0017] Optionally, the hole-shaped flange is extruded by using a thickening component, the thickening component includes a fixed punch, a second lower die seat, a third upper die seat and a pressing punch, the fixed punch is arranged on the second lower die seat, and the specific steps of the thickening process include:

[0018] Placing the punched base plate on the second lower die seat, inserting the fixed punch into the hole-shaped flange, and making the outer wall of the fixed punch abut against the inner wall of the hole-shaped flange;

[0019] Driving the third upper die seat to press tightly against the base plate after the punching;

[0020] The pressing punch is driven to extrude the hole-shaped flange in a direction perpendicular to the surface of the base plate to form the hole-shaped protrusion.

[0021] Optionally, assuming that the side length of the base plate remains unchanged before and after the thickening process, based on the volume invariance principle, we have:

[0022] X=h×A / b

[0023] In the formula, X is the required thickness of the hole-shaped protrusion, h is the height of the hole-shaped flange, A is the thickness of the base plate material, and b is the width of the hole-shaped protrusion.

[0024] Optionally, the thickening process is performed in multiple times, and the number of the thickening process is calculated according to the following formula:

[0025] n=X / (h-δh)

[0026] Wherein, n is the number of the thickening process, and δ is the elongation of the base plate.

[0027] Based on the same technical concept, the present invention also provides a cold stamping device for local thickening of a plate, comprising:

[0028] A punching assembly, used for punching a base plate to form a punching hole;

[0029] A punching assembly, used for punching holes at the punching holes, so that the edges of the punching holes are bent in a direction perpendicular to the surface of the base plate to form hole-shaped flanging edges on the surface of the base plate;

[0030] The thickening component is used to extrude the hole-shaped flange to form a hole-shaped protrusion of a required thickness, wherein the required thickness of the hole-shaped protrusion is greater than the thickness of the base plate material and less than the height of the hole-shaped flange.

[0031] Optionally, the punching assembly includes a punching die, a first upper die seat and a punch, the base sheet is pressed between the punching die and the first upper die seat, the punch faces the recessed portion of the punching die, and the punch can punch the base sheet in a direction perpendicular to the surface of the base sheet to form the punching hole.

[0032] Optionally, the punching assembly includes a punching punch, a first lower die base and a second upper die base, and the punched base sheet is pressed between the first lower die base and the second upper die base. The punching punch can align with the punching hole for punching so that the edge of the punching hole is bent in a direction perpendicular to the surface of the base sheet to form a hole-shaped flange on the surface of the base sheet.

[0033] Optionally, the thickening component includes a fixed punch, a second lower die seat, a third upper die seat and a pressing punch, the fixed punch is arranged on the second lower die seat, the base sheet after the hole is pressed between the second lower die seat and the third upper die seat, the fixed punch is inserted into the hole-shaped flange, and the outer wall of the fixed punch is abutted against the inner wall of the hole-shaped flange, and the pressing punch can extrude the hole-shaped flange in a direction perpendicular to the surface of the base sheet to form the hole-shaped protrusion.

[0034] In the cold stamping method and device for local thickening of a plate provided by the present invention, at least one of the following beneficial effects is achieved:

[0035] 1) Since the entire processing method adopts a cold stamping process at room temperature, the mechanical properties of the material can remain consistent before and after processing;

[0036] 2) Since the base sheet is partially thickened, the thickness of the thinner area can be selected as the thickness specification of the base sheet, which reduces the cost of raw materials. In addition, the punching process and the thickening process do not require cutting off the raw materials, so the material utilization rate is high;

[0037] 3) Since the punching-hole-thickening process can be achieved by conventional stamping, the production efficiency can be improved;

[0038] 4) The molding area is formed by precision die stamping, which makes the product's dimensional accuracy very high, reaching ±0.01 dimensional accuracy, with very good consistency. The dimensions of mass production can be kept within the tolerance range. In addition, the surface finish of the molding area is high, and the finish of the functional surface can reach the grinding quality of Ra0.8 or above;

[0039] 5) The scope of promotion is wide, and this method can be used for processing and manufacturing of metal sheet products in areas with different thicknesses. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Those skilled in the art will appreciate that the accompanying drawings are provided for a better understanding of the present invention and do not constitute any limitation on the scope of the present invention.

[0041] Figure 1 It is a schematic diagram of the structure of a typical locally thickened metal sheet product;

[0042] Figure 2 A flow chart of a cold stamping method for local thickening of a plate provided by an embodiment of the present invention;

[0043] Figure 3 A schematic diagram of the structure of a punching process provided by an embodiment of the present invention;

[0044] Figure 4 A schematic diagram of the structure of a hole punching process provided by an embodiment of the present invention;

[0045] Figure 5 A schematic structural diagram of a thickening process provided in one embodiment of the present invention.

[0046] in:

[0047] 1-opening; 2-outer contour;

[0048] 100-base plate; 110-hole-shaped flanging; 120-hole-shaped protrusion; 210-punching die; 220-first upper die seat; 230-punch; 310-flanging punch; 320-first lower die seat; 330-second upper die seat 330; 410-fixed punch; 420-second lower die seat; 430-third upper die seat; 440-pressing punch;

[0049] X is the required thickness of the hole-shaped protrusion; h is the height of the hole-shaped flange 110; A is the thickness of the base plate; b is the width of the hole-shaped protrusion. DETAILED DESCRIPTION

[0050] In order to make the purpose, advantages and features of the present invention clearer, the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that the accompanying drawings are in a very simplified form and use non-precise proportions, which are only used to conveniently and clearly assist in explaining the purpose of the embodiments of the present invention. In order to make the purpose, features and advantages of the present invention more obvious and easy to understand, please refer to the accompanying drawings. It should be noted that the structure, proportion, size, etc. illustrated in the drawings of this specification are only used to match the content disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the limiting conditions for the implementation of the present invention. Any modification of the structure, change in the proportional relationship or adjustment of the size, under the same or similar conditions as the effects that can be produced by the present invention and the purposes that can be achieved, should still fall within the scope of the technical content disclosed by the present invention.

[0051] As used in the present invention, the singular forms "one", "an", and "the" include plural objects, unless the content clearly indicates otherwise. As used in the present invention, the term "or" is generally used in a sense that includes "and / or", unless the content clearly indicates otherwise. As used in the present invention, the term "several" is generally used in a sense that includes "at least one", unless the content clearly indicates otherwise. As used in the present invention, the term "at least two" is generally used in a sense that includes "two or more", unless the content clearly indicates otherwise. In addition, the terms "first", "second", and "third" are used only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, the features defined as "first", "second", and "third" may explicitly or implicitly include one or at least two of the features.

[0052] In the description of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "fixed" 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, it can be a connection between two elements or an interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0053] Please refer to Figure 2-Figure 5 The embodiment of the present invention provides a cold stamping method for local thickening of a plate, comprising the following steps:

[0054] S1, punching process: punching the base plate 100 to form punching holes;

[0055] S2, punching process: punching the punching hole so that the edge of the punching hole is bent in a direction perpendicular to the surface of the base plate 100 to form a hole-shaped flange 110 on the surface of the base plate 100;

[0056] S3, thickening process: extruding the hole-shaped flange 110 to form a hole-shaped protrusion 120 of a desired thickness, wherein the desired thickness X of the hole-shaped protrusion 120 is greater than the thickness A of the base plate 100 and less than the height h of the hole-shaped flange 110 .

[0057] The cold stamping method for local thickening of a plate provided in an embodiment of the present invention can meet the processing requirements of hole-shaped protrusions 120 of different thicknesses by only performing a punching-hole-flanging-thickening stamping process on the base plate 100, with high production efficiency, and the forming area is stamped by a mold, so the dimensional accuracy of the product is very high and the consistency is very good, which is particularly suitable for local thickening of metal sheet products. In addition, the entire stamping process can be carried out at room temperature, so that the mechanical properties of the material can remain consistent before and after processing.

[0058] First, the punching process of step S1 is performed to punch the base plate 100 to form a punched hole. It should be noted that the thick material area of ​​the product has a regular or irregular shape, and the first step requires trimming. The punching process precisely trims the edge of the area to be thickened and cuts off the excess material to prepare for subsequent uniform thickening.

[0059] Please refer to Figure 3 In this embodiment, the base plate 100 is punched by a punching assembly to form a punching hole. The punching assembly includes a punching die 210, a first upper die holder 220 and a punch 230. The specific steps of the punching process include:

[0060] Placing the base plate 100 on the punching die 210;

[0061] Driving the first upper die seat 220 to press against the base plate 100;

[0062] The punch 230 is driven to punch the base plate 100 in a direction perpendicular to the surface of the base plate 100 to form the punching hole.

[0063] In this embodiment, the entire punching assembly can be integrated on a press, and the punching die 210 is designed according to the area that needs to be cut off. The first upper die base 220 and the punch 230 can be designed with corresponding driving units to drive them respectively to achieve vertical movement, thereby completing the entire punching process.

[0064] Then, the punching process of step S2 is performed to punch holes at the punching holes so that the edges of the punching holes are bent in a direction perpendicular to the surface of the base plate 100 to form hole-shaped flanges 110 on the surface of the base plate 100. In this embodiment, the flange process is a preparatory work for the thickening process, and the flange height depends on the size requirements of the material thickening.

[0065] Please refer to Figure 4 In this embodiment, a punching assembly is used to punch holes at the punching holes. The punching assembly includes a punching punch 310, a first lower die seat 320 and a second upper die seat 330. The specific steps of the punching process include:

[0066] Placing the punched base plate 100 on the first lower die base 320;

[0067] Driving the second upper die seat 330 to press against the punched base plate 100;

[0068] The punching punch 310 is driven to punch the punching hole so that the edge of the punching hole is bent in a direction perpendicular to the surface of the base plate 100 to form a hole-shaped flange 110 on the surface of the base plate 100 .

[0069] Similarly, the entire punch assembly can be integrated on a press, and the second upper die base 330 and the punch 310 can be respectively designed with corresponding drive units to drive them to achieve vertical movement, thereby completing the entire punching process. In this embodiment, the punch 230 punches the base plate 100 from top to bottom, while the punch 310 is just the opposite, flanging the punch hole from bottom to top, and the diameter of the punch 310 is larger than the diameter of the punch hole, so that the edge of the punch hole is bent upward to form the hole-shaped flanging 110.

[0070] Finally, a thickening process in step S3 is performed to extrude the hole-shaped flange 110 to form a hole-shaped protrusion 120 of a desired thickness.

[0071] Please refer to Figure 5The hole-shaped flange 110 is extruded by using a thickening component, the thickening component includes a fixed punch 410, a second lower die seat 420, a third upper die seat 430 and a pressing punch 440, the fixed punch 410 is arranged on the second lower die seat 420, and the specific steps of the thickening process include:

[0072] The base plate 100 after the hole is turned is placed on the second lower die seat 420, and the fixed punch 410 is inserted into the hole-shaped flange 110, and the outer wall of the fixed punch 410 abuts against the inner wall of the hole-shaped flange 110;

[0073] Driving the third upper die seat 430 to press against the punched base plate 100;

[0074] The pressing punch 440 is driven to press the hole-shaped flange 110 in a direction perpendicular to the surface of the base plate 100 to form the hole-shaped protrusion 120 .

[0075] Similarly, the entire thickening assembly can be integrated on a press, and the third upper die base 430 and the pressing punch 440 can be respectively designed with corresponding drive units to drive them to achieve vertical movement, thereby completing the entire thickening process. In this embodiment, the pressing punch 440 extrude the hole-shaped flange 110 from top to bottom to form a hole-shaped protrusion 120 of a desired thickness, and the desired thickness X of the hole-shaped protrusion 120 is greater than the thickness A of the base plate 100 and less than the height h of the hole-shaped flange 110.

[0076] Assuming that the side length of the base plate 100 remains unchanged before and after the thickening process, based on the volume invariance principle, we have:

[0077] X=h×A / b

[0078] Wherein, X is the required thickness of the hole-shaped protrusion 120, h is the height of the hole-shaped flange 110, A is the thickness of the base plate 100, and b is the width of the hole-shaped protrusion 120. The "side length" mentioned here can be understood as the length perpendicular to the paper surface.

[0079] In this embodiment, when the material is thickened by the thickening process, the thickening process usually needs to be set to one or more processes, which usually depends on the elongation rate of the material. The number of the thickening process can be calculated according to the following formula:

[0080] n=X / (h-δh)

[0081] Wherein, n is the number of the thickening process, and δ is the elongation rate of the base plate 100 .

[0082] In this embodiment, considering that the ductility of metal materials is slightly different, a relatively safe value of 0.35 can be used as the mold design parameter. If the calculated n is a non-integer, such as 2.6, it can be rounded up to 3.

[0083] It should be noted that the embodiment of the present invention provides a cold stamping method for local thickening of a plate material, which is achieved through a cold stamping process. Therefore, while thickening the material, other stamping contents are allowed to coexist. For example, if there are other stamping contents such as punching or bending forming on the product, these can be comprehensively considered in the design of the mold with this embodiment.

[0084] Based on the same technical concept, the embodiment of the present invention also provides a device for implementing the above cold stamping method, such as Figure 3-Figure 5 As shown, the device comprises:

[0085] A punching assembly, used for punching the base plate 100 to form a punching hole;

[0086] A punching assembly, used for punching holes at the punching holes, so that the edges of the punching holes are bent in a direction perpendicular to the surface of the base plate 100 to form a hole-shaped flanging 110 on the surface of the base plate 100;

[0087] The thickening component is used to extrude the hole-shaped flange 110 to form a hole-shaped protrusion 120 of a desired thickness. The desired thickness X of the hole-shaped protrusion 120 is greater than the thickness A of the base plate 100 and less than the height h of the hole-shaped flange 110 .

[0088] In this embodiment, the punching assembly includes a punching die 210, a first upper die seat 220 and a punch 230. The base sheet 100 is pressed between the punching die 210 and the first upper die seat 220. The punch 230 faces the recessed portion of the punching die 210, and the punch 230 can punch the base sheet 100 in a direction perpendicular to the surface of the base sheet 100 to form the punching hole.

[0089] In this embodiment, the punching assembly includes a punch 310, a first lower die seat 320 and a second upper die seat 330. The punched base plate 100 is pressed between the first lower die seat 320 and the second upper die seat 330. The punch 310 can align with the punching hole for punching so that the edge of the punching hole is bent in a direction perpendicular to the surface of the base plate 100 to form a hole-shaped flange 110 on the surface of the base plate 100.

[0090] In this embodiment, the thickening component includes a fixed punch 410, a second lower die base 420, a third upper die base 430 and a pressing punch 440. The fixed punch 410 is arranged on the second lower die base 420, and the base plate 100 after the hole is flipped is pressed between the second lower die base 420 and the third upper die base 430. The fixed punch 410 is inserted into the hole-shaped flange 110, and the outer wall of the fixed punch 410 is abutted against the inner wall of the hole-shaped flange 110. The pressing punch 440 can extrude the hole-shaped flange 110 in a direction perpendicular to the surface of the base plate 100 to form the hole-shaped protrusion 120.

[0091] In summary, the embodiment of the present invention provides a cold stamping method and device for local thickening of a plate. Only by performing a punching-hole-flanging-thickening stamping process on the base plate 100, the processing requirements of hole-shaped protrusions 120 of different thicknesses can be met. The production efficiency is high, and the forming area is formed by die stamping, so the dimensional accuracy of the product is very high and the consistency is very good, which is particularly suitable for local thickening of metal sheet products. In addition, the entire stamping process can be carried out at room temperature, so that the mechanical properties of the material can remain consistent before and after processing.

[0092] The above description is only a description of the preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Any changes and modifications made by a person skilled in the art in the field of the present invention based on the above disclosure are within the scope of protection of the present invention. Obviously, a person skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations fall within the scope of the present invention and its equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A cold stamping method for local thickening of a plate, characterized in that: include: Punching process: punching the base sheet to form punching holes; Hole punching process: punching the punched hole so that the edge of the punched hole is bent in a direction perpendicular to the surface of the base plate to form a hole-shaped flange on the surface of the base plate; Thickening process: extruding the hole-shaped flange to form a hole-shaped protrusion of required thickness, wherein the required thickness of the hole-shaped protrusion is greater than the thickness of the base plate material and less than the height of the hole-shaped flange.

2. The cold stamping method for local thickening of a sheet material according to claim 1, characterized in that: The base plate is punched by a punching assembly to form a punching hole, wherein the punching assembly includes a punching die, a first upper die seat and a punch. The specific steps of the punching process include: Placing the base plate on the punching die; Driving the first upper die seat to press against the base plate; The punch is driven to punch the base plate material in a direction perpendicular to the surface of the base plate material to form the punching hole.

3. The cold stamping method for local thickening of a plate according to claim 1, characterized in that: The punching hole is punched by using a punching assembly, the punching assembly includes a punching punch, a first lower die seat and a second upper die seat, and the specific steps of the punching process include: Placing the punched base plate on the first lower die seat; Driving the second upper die seat to press against the punched base plate; The punching punch is driven to align with the punching hole to punch so that the edge of the punching hole is bent in a direction perpendicular to the surface of the base plate material to form a hole-shaped flange on the surface of the base plate material.

4. The cold stamping method for local thickening of a sheet material according to claim 1, characterized in that: The hole-shaped flange is extruded by using a thickening component, the thickening component includes a fixed punch, a second lower die seat, a third upper die seat and a pressing punch, the fixed punch is arranged on the second lower die seat, and the specific steps of the thickening process include: Placing the punched base plate on the second lower die seat, inserting the fixed punch into the hole-shaped flange, and making the outer wall of the fixed punch abut against the inner wall of the hole-shaped flange; Driving the third upper die seat to press tightly against the base plate after the punching; The pressing punch is driven to extrude the hole-shaped flange in a direction perpendicular to the surface of the base plate material to form the hole-shaped protrusion.

5. The cold stamping method for local thickening of a plate according to claim 1, characterized in that: Assuming that the side length of the base plate remains unchanged before and after the thickening process, based on the principle of constant volume, we have: X=h×A / δ In the formula, X is the required thickness of the hole-shaped protrusion, h is the height of the hole-shaped flange, A is the thickness of the base plate material, and b is the width of the hole-shaped protrusion.

6. The cold stamping method for local thickening of a plate according to claim 5, characterized in that: The thickening process is performed in multiple times, and the number of the thickening process is calculated according to the following formula: n=X / (h-δh) Wherein, n is the number of the thickening process, and δ is the elongation of the base plate.

7. A cold stamping device for local thickening of a plate, characterized in that: include: A punching assembly, used for punching a base plate to form a punching hole; A punching assembly, used for punching holes at the punching holes, so that the edges of the punching holes are bent in a direction perpendicular to the surface of the base plate to form hole-shaped flanging edges on the surface of the base plate; The thickening component is used to extrude the hole-shaped flange to form a hole-shaped protrusion of a required thickness, wherein the required thickness of the hole-shaped protrusion is greater than the thickness of the base plate material and less than the height of the hole-shaped flange.

8. The cold stamping device for local thickening of a plate according to claim 7, characterized in that: The punching assembly includes a punching die, a first upper die seat and a punch. The base sheet is pressed between the punching die and the first upper die seat. The punch faces the recessed portion of the punching die, and the punch can punch the base sheet in a direction perpendicular to the surface of the base sheet to form the punching hole.

9. The cold stamping device for local thickening of a plate according to claim 7, characterized in that: The punching assembly includes a punch, a first lower die seat and a second upper die seat. The punched base sheet is pressed between the first lower die seat and the second upper die seat. The punch can align with the punching hole for punching so that the edge of the punching hole is bent in a direction perpendicular to the surface of the base sheet to form a hole-shaped flange on the surface of the base sheet.

10. The cold stamping device for local thickening of a plate according to claim 7, characterized in that: The thickening component includes a fixed punch, a second lower die seat, a third upper die seat and a pressing punch. The fixed punch is arranged on the second lower die seat. The base sheet after the hole is punched is pressed between the second lower die seat and the third upper die seat. The fixed punch is inserted into the hole-shaped flange, and the outer wall of the fixed punch abuts against the inner wall of the hole-shaped flange. The pressing punch can extrude the hole-shaped flange in a direction perpendicular to the surface of the base sheet to form the hole-shaped protrusion.

Images