Thin-wall non-magnetic stainless steel multi-step motor shell production process and manipulator transfer mold production equipment

Abstract

The invention discloses a production process of a thin-wall non-magnetic stainless steel multi-step motor shell, which is characterized in that a product is manufactured by blanking a wafer, carrying out primary stretching, carrying out secondary stretching, carrying out tertiary stretching, carrying out quartic stretching, finishing, trimming, stacking and forming, and chamfering, and also discloses manipulator transfer die production equipment for realizing the production process. Aiming at the special configuration, the material characteristics and the thin-wall characteristics of the product, the production process is mainly designed by selecting a proper stretching ratio, a proper stretching gap and the like, and the qualified product meeting the requirement is prepared; the efficiency is improved by manipulator transfer mold production; a stretching die for four times of stretching is matched with a stretching female die through a movable female die insert, the uniformity of a stretching gap can be automatically calibrated according to the thickness and the stress condition of a material in the stretching process, and the inner diameter precision, the roundness and the wall thickness uniformity of a product after stretching are guaranteed; according to the stamping die for stacked material forming, a die assembly boundary is selected at the position of a stacked material plane, and the phenomena of material cracking, extrusion joint marks or burrs and the like after forming are improved.

Description

Technical Field

[0001] The present invention relates to a production process and production equipment for a motor housing, and in particular to a production process and production equipment for a thin-walled non-magnetic stainless steel multi-step motor housing. Background Art

[0002] The motor housing of the automotive electrical system and intelligent integrated braking system is mainly produced by stretching forming process. Figure 1 The thin-walled, multi-step motor housing shown has a special structure, thin walls, and requires production from non-magnetic stainless steel. Conventional stretch forming techniques pose the following major challenges:

[0003] 1. Non-magnetic stainless steel is relatively hard. After multi-step stretching, the material hardens, becomes severely thinned, and is prone to cracking.

[0004] 2. The shell needs to be trimmed after stretching, which will cause it to lose its roundness and deform;

[0005] 3. The continuous die stamping production requires strip material as a carrier to connect the product for transfer stamping, and the material utilization rate is low;

[0006] 4. The surface of the shell is carbonized after stretching, and it is not cleaned thoroughly, which affects the appearance after cleaning.

[0007] Therefore, for this type of multi-step motor housing product, it is necessary to specifically improve the production process and develop related production equipment. Summary of the Invention

[0008] Purpose of the invention: In response to the above problems, one of the purposes of the present invention is to provide a thin-walled non-magnetic stainless steel multi-step motor housing production process to produce products that meet the requirements and ensure product quality. The second purpose of the present invention is to provide a robot transfer mold production equipment to realize this production process.

[0009] Technical solution: A production process for a thin-walled non-magnetic stainless steel multi-step motor housing, comprising the following steps:

[0010] S10: blanking discs, the disc thickness t is 0.25-1.2 mm;

[0011] S20: One-time stretching, stretching the disc into a cylinder with an open lower end, the stretching gap between the concave and convex dies is 1.1t, and the stretching ratio is 58%;

[0012] S30: Secondary stretching, the cylinder is further stretched to reduce its diameter, increase its height, and reduce its wall thickness. The stretching gap between the concave and convex dies is 1.08t, and the stretching ratio is 80%;

[0013] S40: Three stretching steps, the cylinder is stretched from the top downward to the set height H1 to form a first cylindrical segment, so that its diameter becomes smaller, its height becomes higher, and its wall thickness becomes thinner. A first step is punched out at the end of the first cylindrical segment. The stretching gap between the concave and convex dies is 1.06t, and the stretching ratio is 83%;

[0014] S50: Four stretchings are performed to stretch the cylinder downward from the first step to form a second cylindrical segment, so that its diameter becomes smaller, its height becomes higher, and its wall thickness becomes thinner. The diameter of the second cylindrical segment is larger than that of the first cylindrical segment. A second step is punched out at the end of the second cylindrical segment. The stretching gap between the concave and convex dies is 0.98t, and the stretching ratio is 83%;

[0015] S60: finishing, shaping the second cylindrical segment according to the set height H2, so that the R angle of the second step is sharpened;

[0016] S70: trimming, cutting off the second step from the end point of the second cylindrical segment;

[0017] S80: stacking and forming, at a set position on the second cylindrical segment, the wall surface of the second cylindrical segment is squeezed, bent, and flattened to form a stack, and a third step is punched out at the set position, so that the height of the second cylindrical segment becomes shorter;

[0018] S90: Chamfering, removing burrs from the cut edge;

[0019] The production process uses a robot transfer mold for production.

[0020] Furthermore, in step S10, the wafers are cross-arranged for blanking.

[0021] A robot transfer mold production device for realizing the above-mentioned thin-walled non-magnetic stainless steel multi-step motor housing production process, wherein the molds of steps S10 to S90 are arranged in a straight line in sequence, and a robot is arranged on both sides of the straight line. The robots on both sides move relative to each other to synchronously clamp the workpieces on each mold, and then synchronously transfer them to the corresponding next mold, and then the robot returns to reset.

[0022] Furthermore, the respective molds of steps S20 to S50 include a drawing punch (12) mounted on the lower die set A (11), a drawing die (14) mounted on the upper die set A (13), and a die insert (15); the die insert (15) is annular, is located below the drawing die (14) and is connected to the upper die set A (13), and the drawing die (14) and the die insert (15) form a concave mold surface inside. The lower surface of the die insert (15) is a mold contact surface, and the die insert (15) is a mold contact surface. 5) There is a transverse gap between the wall surface of the die hole on the upper die assembly A (13), the workpiece is placed on the stretching punch (12), and when the stretching die (14) and the die insert (15) are clamped to the stretching punch (12), the die insert (15) is on the outer circumference of the workpiece wall, and the die insert (15) automatically translates and corrects within the transverse gap; a cooling liquid pipeline (16) connected to the outside is opened in the upper die assembly A (13); and an exhaust hole (18) is provided on the top rod (17) on the stretching die (14) at the contact portion with the plane of the workpiece.

[0023] Optimally, the lateral clearance between the die insert and the wall of the die hole is 0.2 mm on one side.

[0024] Optimally, the R angle of the drawing punch is 7t and the R angle of the die insert is 5t.

[0025] Furthermore, the mold of step S80 includes a forming punch and a forming lower mold installed on the lower mold group B, the forming punch is installed on the lower top block, the lower end of the lower top block is connected to the lower mold group B through a spring mechanism, the forming lower mold is arranged on the outer circumference of the forming punch, the upper surface of the forming lower mold is the mold contact surface of the lower surface of the third step, and a gap groove is formed circumferentially between the forming lower mold and the forming punch, and the height of the gap groove is the height from the lower surface of the third step to the end point of the second cylindrical segment. The workpiece is placed on the forming punch, and the wall surface of the second cylindrical segment faces the gap groove. The forming upper mold is installed on the upper mold group B, and the forming upper mold hole is upwardly aligned with the lower surface of the third step. When the forming upper mold is closed to the forming lower mold, the forming upper mold acts on the workpiece, and the forming punch floats downward under the action of the spring mechanism. The wall surface of the second cylindrical segment is in the gap groove and is limited by it. The wall surface of the second cylindrical segment is squeezed, bent, and flattened at the upper surface of the forming lower mold to form a stack.

[0026] Furthermore, the robot includes a transfer plate on the same side of each mold arranged in a straight line, and a movable plate is arranged on the transfer plate corresponding to each mold. The movable plate is connected to a fixed block fixed on the transfer plate by two parallel wire springs. Under the action of the wire springs, the movable plate has a moving space relative to the transfer plate toward each mold, and a clamping opening is provided at the front end of the movable plate; a detection rod is installed on the transfer plate, the front end of the detection rod is in the clamping opening, and the rear end of the detection rod is connected to the sensor.

[0027] Beneficial effects: The advantages of the present invention are:

[0028] 1. In view of the special configuration of motor housing products, the material properties of non-magnetic stainless steel, and the thin-wall characteristics of the product, the production process is designed by focusing on selecting the appropriate stretching ratio and stretching gap, which significantly improves the thinning or cracking phenomenon of the material after rapid stretching and forming, and produces motor housing products with dimensions and precision that meet the requirements and are of qualified quality;

[0029] 2. Production equipment designed for robot transfer mold production to improve production efficiency;

[0030] 3. The four-stage stretching die in the production equipment uses a movable die insert to match the stretching die. During the stretching process, the uniformity of the stretching gap can be automatically calibrated according to the thickness and stress conditions of the material, ensuring the inner diameter accuracy, roundness, and wall thickness uniformity of the product after stretching. During the stretching process, the circumferential force on the product wall is balanced and stable;

[0031] 4. For the stamping die of stacking forming in the production equipment, the mold dividing line should be selected at the stacking plane position to improve the phenomena of material cracking, extrusion marks or burrs after forming. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 This is a structural diagram of a thin-walled multi-step motor housing product;

[0033] Figure 2 This is a schematic diagram of product changes under the production process of this application;

[0034] Figure 3 This is a schematic diagram of the robot transfer mold production equipment;

[0035] Figure 4 This is a schematic diagram of the cross-patterning of discs;

[0036] Figure 5 Schematic diagram of the stretching die structure in step S20;

[0037] Figure 6 for Figure 5 Enlarged view of the drawing punch, drawing die, and die insert area;

[0038] Figure 7 Schematic diagram of the stamping die structure in step S80;

[0039] Figure 8 for Figure 7 Magnified view of the forming punch, forming lower die, and forming upper die areas. DETAILED DESCRIPTION

[0040] The present invention will be further explained below with reference to the accompanying drawings and specific embodiments.

[0041] As attached Figure 1 The thin-walled multi-step motor housing product shown in the figure is produced using non-magnetic stainless steel as raw material. The production process specifically includes steps S10 to S90. The product undergoes changes in each step as shown in the attached figure. Figure 2 As shown, the red lines in the figure indicate the changing parts of the product in each step.

[0042] S10: Blanking disc, on non-magnetic stainless steel plate as attached Figure 4 As shown, the discs are cross-arranged and then punched to obtain discs, with a thickness t of 0.25 to 1.2 mm.

[0043] S20: One-time stretching, stretching the disc into a cylinder with an open lower end, the stretching gap between the concave and convex dies is 1.1t, and the stretching ratio is 58%.

[0044] S30: Secondary stretching, the cylinder is further stretched as a whole to reduce its diameter, increase its height, and reduce its wall thickness. The stretching gap between the concave and convex dies is 1.08t, and the stretching ratio is 80%.

[0045] S40: Three stretchings are performed to continuously stretch the cylinder from the top downward to a set height H1 to form a first cylindrical segment, so that its diameter becomes smaller, its height becomes higher, and its wall thickness becomes thinner. The height of the first cylindrical segment is H1, and a first step is punched out at the end point of the first cylindrical segment. The stretching gap between the concave and convex dies is 1.06t, and the stretching ratio is 83%.

[0046] S50: Four stretchings, the cylinder is stretched downward from the first step to form a second cylindrical section, generally stretched directly to the lower opening of the cylinder, so that its diameter becomes smaller, the height becomes higher, and the wall thickness becomes thinner. The diameter of the second cylindrical section is larger than the diameter of the first cylindrical section. The second step is punched out at the end point of the second cylindrical section, that is, the lower opening of the cylinder. The stretching gap between the concave and convex dies is 0.98t, and the stretching ratio is 83%.

[0047] S60: Finishing: After four stretches, the workpiece's inner diameter is finalized. The second cylindrical segment is shaped to a set height, H2. The height of the second cylindrical segment after shaping is H2, and the R angle of the second step is sharpened. After this step, the overall height of the workpiece is controlled, ensuring that each product has a consistent height. The height deviation of each product is guaranteed to not exceed 0.03mm.

[0048] S70: trimming, cutting off the second step from the end point of the second cylindrical segment, that is, cutting off excess material on the edge of the casing to ensure that the outer edge of the casing does not protrude.

[0049] S80: stacking and forming, at a set position on the second cylindrical segment, the wall surface of the second cylindrical segment is squeezed, bent, and flattened to form a stack, and a third step is punched out at the set position, so that the height of the second cylindrical segment becomes shorter.

[0050] S90: Chamfering, remove the burrs on the cutting edge, and then get the attached Figure 1 The thin-walled, non-magnetic, stainless steel, multi-step motor housing product shown.

[0051] The above production process adopts the robot transfer mold production, Figure 3 Shown is a robot transfer mold production equipment developed to match this production process.

[0052] The molds of steps S10 to S90 are arranged in a straight line in sequence, and a robot is arranged on both sides of the straight line.

[0053] Combined with attachment Figure 3 As shown, the manipulator includes a transfer plate 31, which is parallel to the straight line. A movable plate 32 is arranged on the transfer plate 31 corresponding to each mold. The movable plate 32 is perpendicular to the transfer plate 31. A fixed block 33 is fixedly installed on the transfer plate 31. The movable plate 32 and the fixed block 33 are connected by two parallel wire springs 34. Under the action of the wire springs 34, the movable plate 32 has a moving space relative to the transfer plate 31 toward the mold. The fixed block 33 can be located at the rear end of the movable plate 32 or at the lower side of the movable plate 32. Since the movable plate needs to be translated, the movable plate has a gap in the vertical direction relative to the transfer plate. To avoid relative friction, the space under the movable plate can be used to arrange the fixed block and the wire spring. A clamping opening 35 is opened at the front end of the movable plate 32. The clamping opening 35 is basically arc-shaped. The shape of the clamping opening on the movable plate corresponding to each mold is basically compatible with the curvature of the workpiece shape obtained through each step. A detection rod 36 is also arranged at the movable plate 32, which is installed on the transfer plate 31. The front end of the detection rod 36 is in the clamping opening 35, and the rear end is connected to the sensor 38. The detection rod 36 and the transfer plate 31 are installed with a spring 37, so that the detection rod 36 has the same moving direction as the movable plate 32 under the action of the spring 37.

[0054] The manipulators on both sides always keep synchronous movement, first moving toward the mold relative to each other to clamp the workpieces on each mold. During this process, the transfer plates on both sides face each other and move vertically toward a straight line. The movable plates on both sides of each mold contact the workpiece on the mold through the clamping port to clamp it. Since the transfer plate pushes the movable plate toward the mold, the workpiece is clamped and reacts to the movable plate to move backward. The wire spring adapts to the buffer, and then the front end of the detection rod contacts the workpiece. The spring adapts to the buffer, and the detection rod feeds back a signal to the sensor to detect whether there is a workpiece. Then the manipulator moves to the next mold, and each workpiece is synchronously transferred to the corresponding next mold and placed. Then the manipulator retreats and returns to the current mold to reset.

[0055] Manipulator transfer die production allows for cross-stacked blanking of discs, with the punched discs fed sequentially. This improves material utilization by approximately 20% compared to progressive die stamping, which requires a strip of material as a carrier to connect the product for transfer and stamping. The movable plates are connected by wire springs to form an elastic clamp, ensuring stable and precise product transfer. The wire spring diameter can be selected to meet the required clamping force. The movable plates, especially the front clamping area, are constructed of aluminum alloy to prevent surface damage during clamping.

[0056] Step S10 can be implemented by a punching die to punch out discs from the plate.

[0057] Steps S20 to S50 can be implemented by stretching dies respectively. The structures of the respective stretching dies are similar. The difference is that the stretching punch, stretching die, and die insert correspond to the size of the workpiece obtained by each step. The structure of the stretching die of step S20 is explained as an example. Figure 5 、 6 As shown, the lower die set A11 has a stretching punch 12, and the upper die set A13 has a stretching die 14 and a die insert 15. The stretching die 14 is connected to the upper die set A13 through a push rod 17. The die insert 15 is annular. The upper end of the die insert 15 is connected to the die hole of the upper die set A13 through a boss 151. The die insert 15 is located below the stretching die 14. The stretching die 14 and the die insert 15 constitute a die surface. The lower surface of the die insert 15 is the mold contact surface. A transverse gap L is provided between the die insert 15 and the wall of the die hole. The transverse gap L is 0.2 mm on one side. The disc is placed on the stretching punch. The upper die assembly A moves toward the lower die assembly A. The stretching die and die insert are combined to form the disc, stretching it into a cylinder with an open lower end. During the stretching process, the die insert is circumferentially positioned on the workpiece wall. The die insert as a whole can automatically translate and adjust its center within the lateral gap L. The movable die insert can automatically calibrate the uniformity of the stretching gap according to the material thickness and stress conditions during the stretching process, ensuring the inner diameter accuracy, roundness, and wall thickness uniformity of the product after stretching. The circumferential force on the product wall is balanced and stable during the stretching process. An annular spacer 19 is usually provided above the die insert 15 to form the concave mold surface.

[0058] The R angle of the stretching punch 12 is designed to be 7t to ensure that the material at the R angle of the top of the cylinder does not become thinner during stretching. The R angle of the die insert 15 is designed to be 5t to ensure stable material flow.

[0059] Since non-magnetic stainless steel is relatively hard, it generates a lot of heat during the stretching process. For example, during rapid stretching, the surface of the product is severely carbonized, which is difficult to remove by cleaning. Therefore, a coolant pipeline 16 connected to the outside is opened in the upper die assembly A13, surrounding the stretching die and die inserts to cool them. Water cooling is usually used to ensure that the mold temperature is stable during mass production and does not carbonize due to high temperature during material stretching. It is easy to clean and improves the appearance of the product. In order to avoid rusting of the mold due to leakage of cooling water, sealing rings 161 are required to be set above and below the coolant pipeline 16.

[0060] Since the thin-walled non-magnetic stainless steel workpiece is light in weight, the oil film on the ejector pin 17 will carry the workpiece upward when the stretching die 14 is demolded upward, resulting in no workpiece on the mold when the robot clamps it, affecting the robot's clamping. For this reason, the ejector pin 17 is provided with an exhaust hole 18 at the flat contact part with the workpiece to prevent the oil film from adsorbing the workpiece during demolding.

[0061] Figure 8 The blue line in the middle represents the stretching punch, the red line represents the die insert, and the green line represents the workpiece after stretching.

[0062] Step S60 can be implemented by a stamping die. By setting a height limiting column on the stamping die, the second cylindrical segment is shaped according to the set height H2 during stamping. The stability of the height dimension of the second cylindrical segment after shaping is associated with step S80.

[0063] Step S70 can be implemented by a punching die. The shaped workpiece is finely punched and squeezed to remove excess material from the edge of the casing, thereby ensuring that the outer edge of the casing does not protrude. If the outer edge protrudes, it is very easy to cause waste chips when the casing is assembled and rolled. Extrusion can effectively improve the phenomenon of protruding outer edge cutting edges.

[0064] Step S80 can be implemented by a stamping die, the structure of which is shown in the attached figure. Figure 7 、 8As shown, the lower die set B21 has a forming punch 22 and a forming lower die 23. The forming punch 22 is fixedly mounted on the lower ejector block 24. The lower end of the lower ejector block 24 is connected to the lower die set B21 through a rectangular spring 25. The rectangular spring 25 lifts the lower ejector block 24, and the forming punch 22 connected to the rectangular spring 25 can float up and down. The workpiece is placed on the forming punch 22 for positioning. The outer surface of the forming punch 22 is consistent with the inner surface of the workpiece obtained in step S70. The outer surface of the forming punch is 0.03 mm smaller than the inner diameter of the workpiece obtained in step S70, ensuring that the workpiece can be smoothly placed on the forming punch for positioning. The forming lower die 23 is arranged It is arranged on the outer circumference of the forming punch 22, and the upper surface of the forming lower die 23 is the mold contact surface of the lower surface of the third step. A gap groove is formed in the circumferential direction between the forming lower die 23 and the forming punch 22. The height of the gap groove is the height H3 from the lower surface of the third step to the end point of the second cylindrical section. The gap groove can be formed from the upper surface downward at the inner hole of the forming lower die 23. The wall surface of the second cylindrical section of the workpiece placed on the forming punch corresponds to the gap groove. The upper die group B26 is provided with a forming upper die 27. The forming upper die 27 is connected to the upper die group B26 by a push block 28. The forming upper die 27 ensures the size of the third step. The die hole is upwardly aligned with the lower surface of the third step. The cavity is designed at the third step according to its height and outer diameter. The mouth needs to be mirror polished and the finish must be within Ra0.08. When the upper forming die is closed to the lower forming die, the upper forming die acts on the workpiece, and the upper forming die continues to descend. The forming punch floats downward under the action of the rectangular spring. The wall surface of the second cylindrical section is in the gap sink groove and is limited by the bottom surface of the gap sink groove. The upper forming die continues to descend, and a closed cavity is formed at the upper surface of the lower forming die and the third step cavity of the upper forming die. The wall surface of the second cylindrical section is squeezed up and down, and the material bends and flows into the cavity. Finally, the first cylindrical section is closed after the die is closed. The material at the three steps is flattened to form a stack, which is the third step. The height of the third step is also guaranteed by setting a height-limiting column on the stamping die. The height-limiting column can ensure the stability of the height of each product under pressure, so that there is no gap at the intersection of the inner side of the third step and the wall surface, and no material is thinned and cracked. Since the wall surface is squeezed up and down when forming the third step, the inner wall is easily deformed. The forming punch can ensure that the inner wall size of the product is not affected. A nitrogen spring 29 can also be set between the forming punch 22 and the lower die assembly B21. During demolding, the nitrogen spring plays a role in removing the material from the forming punch. The nitrogen spring and the lower ejector block lift the forming punch to remove the workpiece from the forming lower die. It can be seen that selecting the mold dividing line at the stacking plane position can improve the phenomenon of material cracking, extrusion marks or burrs after molding.

[0065] Figure 8 The blue line in the middle represents the forming punch, the pink line represents the forming upper die, the red line represents the forming lower die, and the green line represents the workpiece after stamping.

[0066] The present invention adopts a thin-walled multi-step motor housing product made of non-magnetic stainless steel, and the wall thickness can be reduced by no more than 5%, meeting the high-precision housing inner diameter size tolerance requirements, the inner diameter does not exceed ±0.02mm, the inner diameter roundness does not exceed 0.03mm, and the production output capacity is not less than 25spm.

Claims

1. A production process for a thin-walled non-magnetic stainless steel multi-step motor housing, characterized in that The following steps are involved: S10: blanking disc, the disc thickness t is 0.25~1.2mm; S20: One-time stretching, stretching the disc into a cylinder with an open lower end, the stretching gap between the concave and convex dies is 1.1t, and the stretching ratio is 58%; S30: Secondary stretching, the cylinder is further stretched to reduce its diameter, increase its height, and reduce its wall thickness. The stretching gap between the concave and convex dies is 1.08t, and the stretching ratio is 80%; S40: three stretchings, the cylinder is stretched from the top downward according to the set height H1 to form a first cylindrical section, so that its diameter becomes smaller, the height becomes higher, and the wall thickness becomes thinner, and the first step is punched out at the end of the first cylindrical section. The stretching gap between the concave and convex dies is 1.06t, and the stretching ratio is 83%; S50: four times of stretching, the cylinder is further stretched downward from the first step to form a second cylindrical section, so that its diameter becomes smaller, its height becomes higher, and its wall thickness becomes thinner. The diameter of the second cylindrical section is larger than the diameter of the first cylindrical section. A second step is punched out at the end of the second cylindrical section. The stretching gap between the concave and convex dies is 0.98t, and the stretching ratio is 83%; S60: finishing, shaping the second cylindrical segment according to the set height H2, so that the R angle of the second step is sharpened; S70: trimming, cutting off the second step from the end point of the second cylindrical segment; S80: stacking and forming, at a set position on the second cylindrical segment, the wall surface of the second cylindrical segment is squeezed, bent, and flattened to form a stack, and a third step is punched out at the set position, so that the height of the second cylindrical segment becomes shorter; S90: Chamfering, removing burrs from the cut edge; The production process uses a robot transfer mold for production.

2. The production process of thin-walled non-magnetic stainless steel multi-step motor housing according to claim 1 is characterized in that: In step S10, the wafers are cross-arranged for blanking.

3. A manipulator transfer mold production equipment for realizing the production process of thin-walled non-magnetic stainless steel multi-step motor housing according to any one of claims 1 to 2, characterized in that: The molds of steps S10 to S90 are arranged in a straight line in sequence, and a robot is arranged on both sides of the straight line respectively. The robots on both sides move relative to each other to synchronously clamp the workpieces on each mold, and then synchronously transfer them to the corresponding next mold, and then the robot returns to reset.

4. The robot transfer mold production equipment according to claim 3 is characterized in that: The respective molds of step S20 to step S50 include a drawing convex mold (12) installed on the lower mold assembly A (11), a drawing concave mold (14) installed on the upper mold assembly A (13), and a concave mold insert (15); the concave mold insert (15) is annular, located below the drawing concave mold (14) and connected to the upper mold assembly A (13); the drawing concave mold (14) and the concave mold insert (15) both form a concave mold surface inside; the lower surface of the concave mold insert (15) is a mold contact surface; the concave mold insert (15) There is a transverse gap between the wall surface of the die hole on the upper die assembly A (13), the workpiece is placed on the stretching punch (12), and when the stretching die (14) and the die insert (15) are clamped onto the stretching punch (12), the die insert (15) is on the outer circumference of the wall surface of the workpiece, and the die insert (15) automatically translates and corrects within the transverse gap; a cooling liquid pipeline (16) connected to the outside is provided in the upper die assembly A (13); and an exhaust hole (18) is provided on the ejector pin (17) on the stretching die (14) at the position in contact with the plane of the workpiece.

5. The robot transfer mold production equipment according to claim 4 is characterized in that: The lateral clearance between the die insert (15) and the wall surface of the die hole is 0.2 mm on one side.

6. The robot transfer mold production equipment according to claim 4, characterized in that: The R angle of the drawing punch (12) is 7t, and the R angle of the die insert (15) is 5t.

7. The robot transfer mold production equipment according to claim 3 is characterized in that: The mold of step S80 comprises a forming convex mold (22) and a forming lower mold (23) mounted on the lower mold assembly B (21); the forming convex mold (22) is mounted on the lower top block (24); the lower end of the lower top block (24) is connected to the lower mold assembly B (21) via a spring mechanism (25); the forming lower mold (23) is arranged on the outer circumference of the forming convex mold (22); the upper surface of the forming lower mold (23) is the mold contact surface of the lower surface of the third step; a gap groove is formed between the forming lower mold (23) and the forming convex mold (22) in the circumferential direction; the height of the gap groove is the distance from the lower surface of the third step to the end point of the second cylindrical segment. The workpiece is placed on the forming punch (22), the wall surface of the second cylindrical section faces the corresponding gap groove, the forming upper die (27) is installed on the upper die group B (26), the die hole of the forming upper die (27) is upwardly aligned with the lower surface of the third step, when the forming upper die (27) is closed to the forming lower die (23), the forming upper die (27) acts on the workpiece, the forming punch (22) floats downward under the action of the spring mechanism (25), the wall surface of the second cylindrical section is in the gap groove and is limited by it, and the wall surface of the second cylindrical section is squeezed, bent, and flattened at the upper surface of the forming lower die (23) to form a stacked material.

8. The robot transfer mold production equipment according to claim 3 is characterized in that: The robot comprises a transfer plate (31) on the same side of each mold arranged in a straight line, a movable plate (32) is arranged on the transfer plate (31) corresponding to each mold, the movable plate (32) is connected to a fixed block (33) fixed on the transfer plate (31) by two parallel arranged wire springs (34), the movable plate (32) has a moving space relative to the transfer plate (31) toward each mold under the action of the wire spring (34), and a clamping opening (35) is provided at the front end of the movable plate (32); a detection rod (36) is installed on the transfer plate (31), the front end of the detection rod (36) is in the clamping opening (35), and the rear end of the detection rod (36) is connected to a sensor.

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