Automobile part cold stamping die and stamping method thereof

Abstract

The invention discloses an automobile part cold stamping die and a stamping method thereof, and relates to the technical field of stamping dies. An automobile part cold stamping die comprises an upper die plate and a lower die plate which are installed on an upper installation plate and a lower installation plate respectively, a sliding block is arranged in the upper die plate in a sliding mode, a male die is installed on the bottom face of the sliding block, and a female die groove corresponding to the male die is formed in the lower die plate. The upper mounting plate and the lower mounting plate are respectively provided with a guide sleeve and a guide column; a punching needle used for punching is installed on the upper die plate. By means of the device, middle concave forming, four-corner punching, burr control and natural chamfering can be synchronously achieved, and secondary procedures of deburring and manual chamfering after traditional punching are omitted by means of the collaborative design of pre-pressing of an inner concave ring groove area through the conical extrusion die and precise punching of the punching needle; and T-H-alpha-R parameter correlation logic is combined, so that the punching process requirement can be met through one-time punching.

Description

Technical Field

[0001] The invention belongs to the technical field of stamping dies, and in particular relates to a cold stamping die for automobile parts and a stamping method thereof. Background Art

[0002] The design of cold stamping dies for automotive parts is one of the key technologies in the automotive manufacturing field, which directly affects the quality, production efficiency and manufacturing cost of automotive parts. Stamping dies are special process equipment used to process metal or non-metal into parts or semi-finished products in the cold stamping process. They are called cold stamping dies, commonly known as cold stamping dies. By working in conjunction with the press, they exert directional pressure on the material, forcing the material to separate (such as punching, blanking) or plastically deform (such as bending, drawing), and ultimately obtain special tools that meet automotive assembly standards for parts or semi-finished products. Because sheet metal parts need to be assembled with bolts after punching, sheet metal punching is the most frequently used process among stamping processes, especially in the production of automotive parts. Cover panels are widely used in automotive parts production. These parts often require a sunken center and perforated edges. However, due to the use of punching, shear deformation and tearing during sheet separation can lead to poor punching quality and burrs on the bottom, which can cause the punched parts to fail to meet process requirements. Among them, in the prior art, secondary processing is usually performed after punching to remove burrs; For example, in the prior art, the patent with announcement number CN217166053U discloses a precision hardware punching punch capable of removing burrs and its precision stamping die, which includes a punch seat and a punch core connected coaxially. The punch core has a plug-in portion, and a brush sleeve with bristles tilted in the counter-stamping direction is sleeved on the plug-in portion. Thus, after the punch punches out a hole in the workpiece, the punch is continuously driven downward to allow the brush sleeve to pass through the hole in the workpiece; because the bristles of the brush sleeve are tilted in the counter-stamping direction, when the brush sleeve is reset with the punch, the bristles can effectively hook the burrs on the edge of the hole in the workpiece, thereby effectively brushing the burrs off the hole. This technical solution can not only effectively remove burrs on the edge of the hole while punching, but also has a simple structure and is easy to implement. The above-mentioned prior art provides a brush sleeve, which hooks the burrs on the edge of the hole when the brush sleeve is reset with the punch to remove the burrs. However, when the brush sleeve is inserted into and pulled out of the hole, it will cause additional damage to the hole, resulting in low hole forming quality and failure to meet process requirements. In addition, the brush sleeve has a removal effect on tiny burrs, but has a poor removal effect on larger burrs. Therefore, a cold stamping die for automobile parts and a stamping method thereof are proposed. Summary of the Invention

[0003] The technical problem solved by the present application is to overcome the deficiencies of the prior art, and to provide an automobile part cold stamping die and a stamping method thereof, which can overcome the above problems or at least partially solve the above problems.

[0004] To solve the above technical problems, the basic idea of the technical solution of the present application is: an automobile part cold stamping die, comprising: an upper die plate and a lower die plate respectively installed on an upper mounting plate and a lower mounting plate, a slide block slidingly arranged in the upper die plate, a male die installed on the bottom surface of the slide block, and a female die groove corresponding to the male die formed in the lower die plate; guide sleeves and guide columns are respectively arranged on the upper mounting plate and the lower mounting plate; a punch pin for punching is installed on the upper die plate, and a pressure sleeve is slidingly connected to the punch pin through a spring two; a female die hole is formed in the lower die plate, and a tapered extrusion die is installed in the female die hole to form an inner concave annular groove area on the bottom surface of the sheet metal; a separation area is formed on the upper edge of the inner concave annular groove area, and the tapered extrusion die is used to increase the distance between the separation area of the sheet metal and the bottom surface of the sheet metal; a stripping rod is arranged on the slide block.

[0005] Preferably, a boss type installation cavity is formed in the upper die plate, the slide block is slidingly connected in the boss type installation cavity, a backing plate one is installed on the upper mounting plate, the upper die plate is installed on the backing plate one, and a spring one is arranged between the top surface of the slide block and the backing plate one.

[0006] Preferably, the spring two is fixedly connected to the pressure sleeve, a cover one is fixedly connected to the end of the spring two away from the pressure sleeve, and the cover one is connected to the upper die plate through a screw.

[0007] Preferably, a sliding cavity is symmetrically formed in the slide block, one end of the stripping rod is slidingly connected in the sliding cavity, a spring three is arranged between the stripping rod and the sliding cavity, and the stripping rod is connected to the slide block through a cover two.

[0008] Preferably, a discharge cavity is formed in the lower die plate, the discharge cavity is communicated with the female die hole to collect waste; a backing plate two is installed on the lower mounting plate, the lower die plate is installed on the backing plate two, the discharge cavity forms a closed chamber through the backing plate two, a gas pipe joint is installed on one side of the lower die plate and communicated with the discharge cavity, one end of the discharge cavity penetrates through the lower die plate, and a plug is arranged on the lower die plate at the penetration position.

[0009] Preferably, the tapered extrusion die comprises a cylindrical body, a continuous upper plane and an inclined plane are formed at the top end of the cylindrical body, an inner hole is formed in the cylindrical body, and the inner hole penetrates through the cylindrical body at both ends.

[0010] Preferably, the punch pin adopts a straight blade edge.

[0011] Preferably, the punch pin adopts a circular arc blade edge.

[0012] Preferably, the sheet thickness is T, the bevel height is H, the arc edge radius is R, and the tapered extrusion die angle is a, wherein H=(1 / 4~1 / 3)T, a=30°~45°, and R=(0.15~0.25)H.

[0013] A stamping method for automobile parts comprises the following steps: S1. Place the sheet material to be processed on the lower template and define its position using the positioning block; S2. The press drives the upper mounting plate downward, and the stripping rod first contacts the sheet material for pre-compression, and then the punch contacts the sheet material and cooperates with the die groove to press the middle concave shape; S3, the upper die continues to move downward, the pressing sleeve contacts both ends of the sheet, and the sheet is squeezed so that the bottom surface contacts the conical extrusion die, and an inner concave annular groove area is pressed out; S4, the pressing sleeve reaches the maximum stroke, the punch needle extends out to penetrate the sheet, and the waste material is pushed into the discharge cavity, and a punched hole with no bottom burrs and chamfers is formed simultaneously; S5. The press drives the upper die upward, springs 1, 2, and 3 return to their original positions, and the stripping rod strips the sheet, completing the stamping.

[0014] After adopting the above technical solution, the present invention has the following beneficial effects compared with the prior art: 1. This cold stamping die for automotive parts can simultaneously achieve concave forming in the middle, punching holes at four corners, burr control, and natural chamfering. Relying on the collaborative design of the concave ring groove area pre-pressed by the tapered extrusion die and the precise punching of the punch needle, it eliminates the secondary processes of "deburring and manual chamfering" after traditional stamping. Compared with existing technologies, it can better "remove" burrs, thereby reducing the generation of burrs on the bottom edge of the punching hole. In addition, combined with the TH-α-R parameter association logic, it ensures that the punching process requirements can be met in a single stamping, effectively improving production efficiency.

[0015] 2. The upper mold plate of this automotive component cold stamping die utilizes a height difference design between the stripper bar, punch, and press sleeve to achieve a sequential connection between pre-pressing, concave forming, annular groove pre-pressing, and punching. The stripper bar pre-positions the sheet material to prevent warping at both ends during stamping. Springs 1 and 2 ensure continuous stamping of the punch and stable extrusion of the press sleeve. The lower mold plate incorporates an annular groove on the inclined surface of the tapered extrusion die, confining the separation zone within the sheet material and preventing burrs on the bottom surface from being exposed.

[0016] 3. The cold stamping die for automobile parts has a discharge cavity in the lower die plate that cooperates with a block to collect waste materials in a centralized manner. The gas introduced into the air pipe joint can assist in material removal and cool the die.

[0017] 4. Compared with the existing technology, the cold stamping die for automotive parts has no pre-pressing ring groove, which results in many burrs on the bottom surface and requires secondary processing. This device limits the burrs to the inner wall of the punching hole through the concave ring groove area, and cooperates with the arc blade edge to achieve natural chamfering on the upper surface. The hole quality is significantly better than the traditional process. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In the attached figure: Figure 1 This is a schematic structural diagram of a cold stamping die for automotive parts proposed by the present invention; Figure 2 A perspective view of a cold stamping die for an automobile component proposed by the present invention; Figure 3 This is a structural schematic diagram of an upper template, a first backing plate, a lower template, and a second backing plate of a cold stamping die for automobile parts proposed by the present invention; Figure 4 This is a schematic structural diagram of a punch of a cold stamping die for automotive parts proposed by the present invention; Figure 5 This is a schematic structural diagram of a punching pin and a stripping rod of a cold stamping die for automotive parts proposed by the present invention; Figure 6 This is a structural schematic diagram of a boss-type mounting cavity and a spring of a cold stamping die for automotive parts proposed by the present invention; Figure 7 This is a structural diagram of a slider, a punching needle, and a stripping rod of a cold stamping die for automotive parts proposed by the present invention; Figure 8 This is a separation diagram of the punch pin, upper template, slider, and peeling rod of a cold stamping die for automotive parts proposed by the present invention; Figure 9 This is a structural schematic diagram of a trachea joint of a cold stamping die for automobile parts proposed by the present invention; Figure 10 This is a schematic structural diagram of a positioning block for a cold stamping die for automotive parts proposed by the present invention; Figure 11 This is a schematic structural diagram of a discharge cavity and a blocking block of a cold stamping die for automotive parts proposed by the present invention; Figure 12 This is a schematic structural diagram of a straight edge of a cold stamping die for automotive parts proposed by the present invention; Figure 13 This is a schematic structural diagram of the arc cutting edge of a cold stamping die for automotive parts proposed by the present invention; Figure 14 This is a structural schematic diagram of the collapsed corner area, concave ring groove area, and separation area of ​​a cold stamping die for automotive parts proposed by the present invention; Figure 15This is a structural schematic diagram of the upper plane, inclined surface, cylindrical body, and inner hole of a cold stamping die for automotive parts proposed by the present invention; Figure 16 Schematic diagram of stamping products Figure 1 ; Figure 17 Schematic diagram of stamping products Figure 2 ; Figure 18 Schematic diagram of the existing punching process.

[0019] In the figure: 1, upper mounting plate; 11, backing plate 1; 12, upper template; 121, boss mounting cavity; 13, guide sleeve; 14, slider; 140, punch; 141, spring 1; 142, sliding cavity; 15, punch; 1501, straight edge; 1502, arc edge; 151, pressing sleeve; 152, spring 2; 153, cover 1; 16, peeling rod; 161, spring 3; 162, cover 2; 2. Lower mounting plate; 21. Backing plate 2; 22. Lower template; 220. Die groove; 221. Positioning block; 23. Guide pillar; 24. Conical extrusion die; 241. Inner hole; 242. Upper plane; 243. Inclined surface; 245. Column; 25. Discharge cavity; 251. Air pipe connector; 252. Blocking block; 26. Die hole; 3. Sheet material; 30. Punching; 31. Collapsed corner area; 32. Inner concave ring groove area; 33. Separation area. DETAILED DESCRIPTION

[0020] In order to make the purpose, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the present invention. The following embodiments are used to illustrate the present invention but are not used to limit the scope of the present invention.

[0021] Reference Figures 1-18 The automotive component cold stamping die disclosed in this embodiment is primarily used for cold stamping sheet metal 3, achieving integrated processing of "center concave forming, corner punching, burr control, and natural chamfering." Sheet metal 3 has a thickness T ranging from 3 to 6 mm, and in this embodiment, T is 3 mm.

[0022] The overall structure of the stamping die includes: The upper mold part includes the upper mounting plate 1, the backing plate 11, the upper mold plate 12, the guide sleeve 13, the slider 14, the punch 140, the spring 141, the punch 15, the pressing sleeve 151, the spring 2 152, the cover 153, the peeling rod 16, the spring 3 161, and the cover 2 162. The upper mold plate 12 is fixed to the upper mounting plate 1 through the backing plate 11. The upper mold plate 12 is provided with a boss mounting cavity 121 inside. The slider 14 is slidably connected to the boss mounting cavity 121 (the structure of the boss mounting cavity 121 and the slider 14 is shown in FIG. 1).Figure 7 ), a spring 141 is installed between the top surface of the slider 14 and the backing plate 11 (providing a reset force for the slider 14 and elastic pressure on the sheet 3). A punch 140 is mounted on the bottom surface of the slider 14 (for forming the concave shape in the middle of the sheet 3). Two sets of sliding cavities 142 (two sliding cavities 142 in each set) are symmetrically defined on either side of the slider 14. One end of the peeling rod 16 slides within the sliding cavity 142, and a spring 3 161 is installed between the peeling rod 16 and the sliding cavity 142 (driving the peeling rod 16 to reset and preventing the formed sheet 3 from moving upward with the slider 14). The other end of the peeling rod 16 is restrained by a cover 2 162 (the provision of cover 2 162 also facilitates the installation and removal of the peeling rod 16).

[0023] A punching needle 15 is also fixed on the upper template 12 (used for punching the four corners of the sheet 3 to form punching holes 30; the installation of the punching needle 15 is through setting a mounting hole on the upper template 12, installing the punching needle 15 from the surface of the upper template 12 into the mounting hole, and installing the upper template 12 on the pad 11 to limit and fix the punching needle 15. It should be understood that the end of the punching needle 15 with a larger diameter slightly protrudes from the surface of the upper template 12 to prevent the punching needle 15 from moving up and down in the mounting hole after installation). A pressing sleeve 151 is provided on the end of the punching needle 15, and the pressing sleeve 151 can slide on the punching needle 15. A spring 2 152 is connected between the pressing sleeve 151 and the cover 1 153 (the spring 2 152 enables the pressing sleeve 151 to press the sheet 3).

[0024] The lower die part includes the lower mounting plate 2, the second backing plate 21, the lower template 22, the guide pillar 23, the tapered extrusion die 24, and the block 252. The lower template 22 is fixed to the lower mounting plate 2 via the second backing plate 21. The top surface of the lower template 22 is provided with a die groove 220 corresponding to the punch 140 (matching the concave shape in the middle of the molding), and the four corners are provided with die holes 26. The tapered extrusion die 24 is installed in the die holes 26 by means of interference fit. The lower template 22 is provided with a discharge cavity 25 inside and is connected to the die hole 26. One end of the discharge cavity 25 passes through the side of the lower template 22, and a block 252 is provided on the lower template 22 at the penetration position (on the one hand, the discharge cavity 25 is formed into a closed chamber; on the other hand, removing the block 252 can facilitate the cleaning of the waste material in the discharge cavity 25).

[0025] The tapered extrusion die 24 includes a cylindrical body 245 , a top end of which is formed with a continuous upper plane 242 and an inclined surface 243 , and a centrally formed inner hole 241 (for the punching needle 15 to pass through).

[0026] In the initial state, the upper mounting plate 1 and the lower mounting plate 2 are separated, and the spring 141, the spring 2 152, and the spring 3 161 are all in a naturally extended state; the sheet 3 is placed on the top surface of the lower template 22, and the sheet 3 is limited by the positioning block 221 (refer to Figure 10), improve placement speed and accuracy; wherein, in the initial state, the end of the stripping rod 16 protrudes from the punch 140, and the pressing sleeve 151 is shorter than the punch 140, so that a height difference is formed among the stripping rod 16, the punch 140, and the pressing sleeve 151, and the height difference is from high to low in the following order: stripping rod 16>punch 140>pressing sleeve 151>punch 15.

[0027] During mold closing, the press drives the upper mounting plate 1 downward, and the guide sleeve 13 slides along the guide post 23 to ensure mold closing accuracy. First, the stripper rod 16 contacts the surface of the sheet 3, pre-compressing it and preventing it from misaligning. Then, as the upper mounting plate 1 continues to descend, the stripper rod 16 slides into the slide cavity 142 and compresses the spring 3 161. Subsequently, the punch 140 contacts the sheet material 3 and presses it downward. The punch 140 cooperates with the die groove 220 to press the middle portion of the sheet material 3 into a concave shape. During the process of the punch 140 pressing the sheet material 3 downward, the ends of the sheet material 3 will tilt up. At this time, the peeling rod 16 will limit the tilting to avoid excessive tilting and poor pressing quality. Secondly, the continuous downward movement of the upper mounting plate 1 will also cause the slider 14 to retract into the boss-type mounting cavity 121 and squeeze the spring 141, so that the punch 140 continues to press the sheet material 3. During this process, the pressing sleeve 151 contacts the ends of the sheet material 3 and continues to press the sheet material 3 during the retraction of the punch 140, so that the bottom surface of the sheet material 3 is in hard contact with the conical extrusion die 24, and the concave annular groove area 32 is pressed out. In order to improve the wear resistance of the pressing sleeve 151 and the conical extrusion die 24, high-speed steel, powder metallurgy high-speed steel or heat-treated metal materials can be used.

[0028] It should be understood that both spring 141 and spring 2 152 are mold-specific springs, which have high stiffness characteristics and a significantly higher elastic coefficient (stiffness coefficient) than ordinary springs. An effective compression stroke will only occur when the external force reaches its designed working load threshold. This feature ensures that the spring maintains the stability of the pressing sleeve 151 during the mold pre-contact stage (such as when the pressing sleeve 151 initially contacts the sheet 3), avoiding premature compression caused by slight external forces, thereby ensuring molding accuracy.

[0029] When the concave annular groove area 32 is pressed, the pressing sleeve 151 reaches the maximum upward stroke, so that the end of the punch needle 15 extends out of the pressing sleeve 151, penetrates the sheet material 3 and enters the inner hole 241 of the conical extrusion die 24, and pushes the punched waste into the discharge cavity 25, completing the punching operation on the sheet material 3.

[0030] After punching is completed, the press drives the upper mounting plate 1 upward, spring 141, spring 2 152, and spring 3 161 reset, and the stripping rod 16 strips the sheet 3 from the punch 140 under the action of spring 3 161, and the pressing sleeve 151 resets to prevent the sheet 3 from moving upward with the punch 15, completing a punching operation.

[0031] Prior to this, reference Figure 18 , Figure 18 This is the punching state of the punching die in the existing technology without using the tapered extrusion die 24. Figure 18 The fracture zone shown in the figure is the tearing zone caused by the separation of the sheet during punching. Its inner wall is mostly characterized by faults and burrs. Below the fracture zone is the burr zone, and the burrs protrude from the bottom surface of the sheet 3. Reference Figure 12 , and in the punching operation of this device, the punching needle 15 adopts a straight blade edge 1501. In the process of the punching needle 15 penetrating the sheet 3, since the bottom surface of the sheet 3 is pre-pressed with an inner concave annular groove area 32, the separation area 33 changes to the sheet 3, that is, on the inner wall of the punching hole 30. Therefore, when the punching needle 15 applies pre-extrusion to the upper surface of the sheet 3, when the punching needle 15 reaches the separation area 33 (the separation area 33 is the upper edge of the inner concave annular groove area 32, that is, the separation point between the waste material and the sheet 3), the punching operation is completed, and the punching hole 30 is formed. This design can reduce Figure 8 The thickness of the fracture zone is reduced, thereby effectively avoiding the formation of burrs on the bottom surface of the sheet 3 at the punching hole 30. Secondly, since the tapered extrusion die 24 is provided with an inclined surface 243 (refer to Figure 15 ), so when the conical extrusion die 24 extrude the bottom surface of the sheet material 3, the edge of the punching hole 30 on the bottom surface of the sheet material 3 will appear "chamfered", and the "chamfered" position is smoother than the existing fracture zone, so that a better quality punching hole 30 can be formed.

[0032] In some embodiments, reference Figure 13 The punching needle 15 adopts a circular blade edge 1502. Compared with the straight blade edge 1501, the circular blade edge 1502 can increase the curvature of the collapsed angle area 31 in the punching hole 30 (making the edge of the punching hole 30 on the surface of the sheet 3 rounded to avoid sharp edges of the collapsed angle or burrs). On the other hand, it can make the collapsed angle area 31 smaller than the punching hole 30 in the prior art ( Figure 18 ) The edge of the collapsed angle band is smoother, further improving the punching 30 forming quality and thus meeting the process requirements; The collapsed corner area 31 is naturally generated when the punching needle 15 contacts the sheet material 3 during punching and the sheet material 3 at the contact position separates.

[0033] In some embodiments, reference Figure 14 、 Figure 15 , assuming that the thickness of the sheet 3 is T, the height of the inclined surface 243 is H, the radius of the arc edge 1502 is R, and the cone angle of the tapered extrusion die 24 is a, where H = (1 / 4~1 / 3) T, a = 30°~45°, and R = (0.15~0.25) H; The height H of the bevel 243 directly determines the depth of the concave annular groove 32. When H is 1 / 4 to 1 / 3 the thickness T of the sheet 3, the separation zone 33 is located in the "middle plastic deformation zone" of the sheet 3 (rather than the rigid zone near the bottom). In this case, burrs generated by the separation of the sheet 3 are concentrated on the inner wall of the punch hole 30, avoiding burrs on the bottom surface of the sheet 3 (the assembly contact surface), thus eliminating the need for secondary grinding. However, if H is less than 1 / 4T, the separation zone 33 is close to the bottom surface of the sheet 3, and bottom burrs may still be generated; if H is greater than 1 / 3T, the inner concave annular groove area 32 is too deep, which will cause the remaining thickness of the hole wall of the punching hole 30 to be too thin (especially for thin plates), and the hole wall is prone to deformation (such as collapse and wrinkles) after punching, affecting the structural strength of the bolt assembly. Therefore, this range can take into account both "avoiding burrs" and "hole wall strength".

[0034] The cone angle α controls the inclination angle of the sidewall of the inner concave annular groove area 32. At this time, the extrusion force of the tapered extrusion die 24 can be evenly transmitted to the inner concave annular groove area 32 along the inclined surface 243, forming an annular groove with a smooth edge (without wrinkles caused by local overpressure); If α is less than 30° (the taper is too steep), the side wall of the concave annular groove area 32 is steep, and the punching needle 15 is likely to squeeze the side wall to form a "lateral bulge" during punching; if α is greater than 45° (the taper is too gentle), the extrusion force is dispersed, and a clear annular groove cannot be formed (only a slight indentation), and the pre-load guiding function is lost. Therefore, this angle range can ensure that the punching force is consistent with the stress direction of the side wall of the concave annular groove area 32, thereby avoiding bulges on the inner wall of the punched hole 30.

[0035] The radius R of the arc edge 1502 is associated with the depth H of the annular groove, which makes the sinking depth of the upper surface of the sheet 3 and the punching position of the bottom wall of the concave annular groove area 32 form a "gradual transition", naturally forming a smooth chamfer. If R is less than 0.15H, the cutting edge is too sharp, and "tearing burrs" are likely to occur during punching. If R is greater than 0.25H, the cutting edge is too blunt, which will result in "extrusion rather than separation", and "extrusion pressure residual bulges" are likely to appear on the inner wall of the punched hole 30. Therefore, this ratio can balance "shear sharpness" and "extrusion formability" to ensure the accuracy of the hole chamfer.

[0036] The diameter of the punched hole 30 is preferably controlled between 3 mm and 18 mm.

[0037] In summary, through the THaR parameter association logic, the central concave forming - four-corner punching - two-way burr control - upper surface chamfering can be completed simultaneously in one stamping, eliminating multiple subsequent steps (chamfering and deburring) in traditional processes and effectively improving production efficiency.

[0038] In some embodiments, reference Figure 9The lower die plate 22 is provided with a gas pipe joint 251 on one side (the gas pipe joint 251 is connected with an air compressor through a gas pipe), when the blocking block 252 is still in the discharging cavity 25, air is pumped into the discharging cavity 25 through the gas pipe joint 251, the formed plate material 3 is separated from the lower die plate 22 by the gas through the die hole 26, thereby avoiding the difficulty in taking out the formed plate material 3, and thereby realizing the automatic material discharging action; meanwhile, the pumped gas can also cool the lower die plate 22.

[0039] Embodiment: refer to Figures 1-18 A stamping method of an automobile part, comprising the following steps: S1, placing the plate material 3 to be processed on the lower die plate 22, and limiting the position through the positioning block 221; S2, driving the upper mounting plate 1 of the press downward, the stripping rod 16 first contacts the plate material 3 to pre-press, and then the punch 140 contacts the plate material to press the middle concave shape in cooperation with the concave die groove 220; S3, the upper die continues to go down, the pressing sleeve 151 contacts the both ends of the plate material 3, extrudes the plate material to make the bottom surface contact the tapered extrusion die 24, and the inner concave ring groove area 32 is pressed out; S4, the pressing sleeve 151 reaches the maximum stroke, the punch pin 15 extends through the plate material 3, the waste material is pushed into the discharging cavity 25, and the bottom surface burr-free and chamfered punching hole 30 is formed at the same time; S5, driving the upper die of the press upward, the spring one 141, the spring two 152 and the spring three 161 reset, the stripping rod 16 strips the plate material 3, and the stamping is completed.

[0040] The above only describes the preferred embodiments of the present application, and does not limit the present application in any form, although the present application has been disclosed as above, however, it is not intended to limit the present application, any person skilled in the art can make some changes or modifications to the above-mentioned technical content without departing from the technical solution of the present application, as long as it does not depart from the technical solution of the present application, any simple modification, equivalent change and modification of the above embodiments according to the technical essence of the present application, all still belong to the scope of the present application.

Claims

1. A cold stamping die for automobile parts, comprising an upper mounting plate (1), a lower mounting plate (2) and a sheet material (3), characterized in that: Also includes: An upper template (12) and a lower template (22) are respectively mounted on the upper mounting plate (1) and the lower mounting plate (2); a slider (14) is slidably provided in the upper template (12); a punch (140) is mounted on the bottom surface of the slider (14); and a die groove (220) corresponding to the punch (140) is provided on the lower template (22); The upper mounting plate (1) and the lower mounting plate (2) are respectively provided with a guide sleeve (13) and a guide column (23); A punching needle (15) for punching holes is installed on the upper template (12), and a pressing sleeve (151) is slidably connected to the punching needle (15) via a second spring (152); The lower template (22) is provided with a die hole (26), and a conical extrusion die (24) is installed in the die hole (26) for forming an inner concave annular groove area (32) on the bottom surface of the sheet material (3), and a separation area (33) is formed on the upper edge of the inner concave annular groove area (32), and the conical extrusion die (24) is used to increase the distance between the separation area (33) of the sheet material (3) and the bottom surface of the sheet material (3); A peeling rod (16) is arranged on the slider (14).

2. The cold stamping die for automobile parts according to claim 1, characterized in that: A boss-type mounting cavity (121) is provided in the upper template (12), the slider (14) is slidably connected in the boss-type mounting cavity (121), a pad (11) is installed on the upper mounting plate (1), the upper template (12) is installed on the pad (11), and a spring (141) is provided between the top surface of the slider (14) and the pad (11).

3. The cold stamping die for automobile parts according to claim 1, characterized in that: The second spring (152) is fixedly connected to the pressing sleeve (151), and one end of the second spring (152) away from the pressing sleeve (151) is fixedly connected to the first cover (153), and the first cover (153) is connected to the upper template (12) through screws.

4. The cold stamping die for automobile parts according to claim 1, characterized in that: A sliding cavity (142) is symmetrically provided in the slider (14), one end of the peeling rod (16) is slidably connected in the sliding cavity (142), a spring three (161) is provided between the peeling rod (16) and the sliding cavity (142), and the peeling rod (16) is connected to the slider (14) through a cover two (162).

5. The cold stamping die for automobile parts according to claim 1, characterized in that: A discharge cavity (25) is provided in the lower template (22), and the discharge cavity (25) is connected to the die hole (26) for collecting waste; A second pad (21) is mounted on the lower mounting plate (2), and the lower template (22) is mounted on the second pad (21). The discharge cavity (25) forms a closed chamber through the second pad (21). An air pipe joint (251) connected to the discharge cavity (25) is mounted on one side of the lower template (22). One end of the discharge cavity (25) passes through the lower template (22), and a blocking block (252) is provided on the lower template (22) at the penetration point.

6. A cold stamping die for automobile parts according to claim 1 or 2 or 3 or 4 or 5, characterized in that: The conical extrusion die (24) comprises a cylindrical body (245), the top of which is formed with a continuous upper plane (242) and an inclined surface (243), and the cylindrical body (245) is provided with an inner hole (241), with both ends of the inner hole (241) passing through the cylindrical body (245).

7. The cold stamping die for automobile parts according to claim 6, characterized in that: The punching needle (15) adopts a straight edge (1501).

8. The cold stamping die for automobile parts according to claim 6, characterized in that: The punching needle (15) adopts a circular arc blade edge (1502).

9. The cold stamping die for automobile parts according to claim 8, characterized in that: The thickness of the sheet material (3) is T, the height of the inclined surface (243) is H, the radius of the arc edge (1502) is R, and the cone angle of the conical extrusion die (24) is a. Among them, H=(1 / 4~1 / 3)T, a=30°~45°, R=(0.15~0.25)H.

10. A stamping method for automobile parts, based on the automobile parts cold stamping die according to any one of claims 1 to 9, characterized in that: The steps include: S1, placing the sheet material (3) to be processed on the lower template (22) and defining its position by a positioning block (221); S2, the press drives the upper mounting plate (1) downward, the stripping rod (16) first contacts the sheet material (3) for pre-compression, and then the punch (140) contacts the sheet material and cooperates with the die groove (220) to press the middle concave shape; S3, the upper die continues to move downward, the pressing sleeve (151) contacts both ends of the sheet material (3), and the sheet material is squeezed so that the bottom surface contacts the conical extrusion die (24), and the inner concave annular groove area (32) is pressed out; S4, the pressing sleeve (151) reaches the maximum stroke, the punching needle (15) extends to penetrate the sheet (3), and the waste material is pushed into the discharge cavity (25), and a punching hole (30) with no bottom burr and chamfer is formed simultaneously; S5. The press drives the upper die upward, spring 1 (141), spring 2 (152), and spring 3 (161) are reset, and the stripping rod (16) strips the sheet (3), completing the stamping.

Images