A high-precision and strong steel frame punch press

Abstract

The present invention discloses a high-precision strong steel frame punch press, which specifically relates to the field of stamping processing technology, including a punch press assembly, a progressive die assembly provided on the punch press assembly, the progressive die assembly consisting of a punching part, a cutting part and a bending forming part, the punching part including a punching column and a punching bearing seat, a punching head fixedly installed at the bottom of the punching column, punching matching holes provided on the punching bearing seat, the punching part also including a covering plate, the punching column is provided with an inwardly contracted section, and an external pressure sleeve is provided on the outside of the inwardly contracted section. The present invention controls the expansion of the external pressure sleeve, and then when the mold is parted, an upward extrusion is formed on the protruding structure at the bottom edge of the hole, thereby reducing the downward protruding structure at the bottom of the hole, so that the forming accuracy of the material is higher and the surface is smoother, and the excessive deformation part formed by the extrusion of the external forming surface during bending forming will not be extruded on the forming pressure head, which is not conducive to unloading, thereby improving the processing efficiency and processing accuracy of the punch press.

Description

Technical Field

[0001] The present invention relates to the technical field of punching processing, and more particularly to a high-precision strong steel frame punching machine. Background Art

[0002] A punch press is a stamping press. Stamping production primarily targets sheet metal products. Using dies, it can produce blanking, punching, forming, drawing, trimming, fine blanking, shaping, riveting, and extrusion. A punch press primarily consists of a steel frame (frame), slider, worktable, transmission system, clutch and brake, control system, and die assembly. The steel frame is the main structure of the press, while the slider, the up-and-down moving part, is mounted on the frame and connected to the drive system via a crankshaft, connecting rod, and other transmission mechanisms. The worktable, located at the bottom of the press frame, supports the material being processed. The transmission system transmits power from a power source (such as an electric motor) to the slider, enabling its up-and-down motion. The transmission system can be composed of mechanical components such as crankshafts, gears, connecting rods, etc., or it can be directly driven by hydraulics or servo motors. The clutch and brake are used to control the movement state of the slider. The control system is a CNC system equipped with a punch press, which is used to accurately control various parameters of the stamping process, such as the number of strokes, processing speed, etc., to improve production efficiency and product quality. The mold assembly is an indispensable tool for completing specific stamping tasks. It is divided into two parts, the upper mold and the lower mold, which are installed on the slider and the workbench respectively.

[0003] In the actual use of the punch press, in order to improve the processing efficiency, a progressive stamping scheme is used, and multiple stamping operations are performed simultaneously on one punch press. Specifically, multiple stations and corresponding forming structures are set on the mold, and the metal strip is conveyed and the punch press is operated at intervals, so that the material passes through the corresponding stations in sequence, and then multi-stage stamping operations are performed in sequence.

[0004] For example, for a grooved tube structure with a U-shaped cross-section or other openings, during processing, the material is shaped and cut by the upper level of the mold, and then transported to the extrusion molding area of ​​the next level. The material is extruded downward with the help of a molding head to cause it to bend and deform (i.e., into a U shape), and then the tops of both sides of the material are extruded and bent in conjunction with the extrusion structures on both sides, so that the material is completely attached to the molding head and bent into shape to obtain a molded product. Subsequently, as the slider rises, the molding head is lifted up, and the molded product leaves the mold, and the molded product can be removed.

[0005] In the above scheme, since the surface of the product structure is relatively flat, the stress and deformation of the material during molding is also relatively uniform. However, for the above products with holes on some surfaces, it is necessary to punch the corresponding positions on the material before bending and molding, and in order to facilitate blanking, the punching direction is mainly from top to bottom. Therefore, after the punching is completed, a certain downward extrusion deformation protrusion structure and a small amount of burr structure will be formed on the edge of the material hole. That is to say, during the subsequent bending, that is, when the corresponding molding surfaces on both sides extrude this part, the above protrusion structure protrudes from the material surface. Therefore, when the corresponding molding surface squeezes this part toward the molding pressure head, the hole part Due to the effect of the protruding structure, the part will be excessively deformed toward the forming head due to the reverse extrusion of the forming surface (in order to ensure that the product can be unloaded smoothly, a reserved gap is actually set between the forming head and the material during design, so a protruding deformation in the opposite direction of the protruding structure of the original hole will be formed), affecting the accuracy of the product after the material is bent and formed. At the same time, the deformation increases the extrusion force on the side of the forming head, thereby increasing the resistance between the formed product and the forming head, making it difficult to unload the material, and affecting the processing efficiency. If the formed product is forcibly taken out, the excessive deformation of the formed product will cause wear on the forming head, affecting the mold accuracy, and thus affecting the processing accuracy of subsequent products. Summary of the Invention

[0006] The present invention provides a high-precision and strong steel frame punching machine, which aims to solve the following problems: in the existing forming processing of grooved tube structures, when the surface needs to be punched in advance, a certain downward extrusion and deformation protruding structure will be formed at the edge of the material hole after the punching is completed. During subsequent bending, the corresponding forming surfaces on both sides extrude this part. Due to the action of the protruding structure, the hole part will be excessively deformed toward the forming pressure head due to the reverse extrusion of the forming surface, affecting the product accuracy after the material is bent and formed. At the same time, the deformation increases the extrusion force with the side of the forming pressure head, thereby increasing the resistance between the formed product and the forming pressure head, making it difficult to cut the material.

[0007] To achieve the above object, the present invention provides the following technical solutions: a high-precision strong steel frame punch press, comprising a punch press assembly, on which a progressive die assembly is provided;

[0008] The progressive die assembly includes an upper die and a lower die, which are respectively mounted on the slide and the workbench of the punch assembly. The progressive die assembly consists of a punching part, a cutting part, and a bending forming part.

[0009] The punching part includes a punching column and a punching bearing seat. The bottom of the punching column is fixedly installed with a punching head, and the punching bearing seat is provided with punching matching holes.

[0010] The punching part also includes a covering plate, which is vertically slidably installed below the upper mold through an elastic sliding support member, and a through hole for the punching column to pass through is provided on the covering plate at a position corresponding to the punching column;

[0011] The portion of the punching column above the punching head is provided with an inwardly contracted section, an external pressure sleeve is provided on the outside of the inwardly contracted section, and the punching column is also provided with an expansion control component for controlling the expansion of the external pressure sleeve.

[0012] In a preferred embodiment, the punch assembly includes a steel frame, the slider is driven by a drive system to move vertically on the steel frame, the workbench is fixedly mounted on the steel frame, the punching column is fixedly mounted on the bottom of the upper die, the punching bearing seat is fixedly mounted on the top of the lower die, and a strip loading assembly is provided on the outside of the punch assembly, which is used to convey and drive the strip to move.

[0013] In a preferred embodiment, the expansion control component is an expansion sleeve, which is arranged on the inner side of the external pressure sleeve. The expansion sleeve is fixedly installed on the retracted section of the punching column. An oil injection area is provided on the inner side of the middle part of the expansion sleeve. A delivery channel for delivering pressure oil to the oil injection area in the expansion sleeve is provided in the punching column. A docking pipe structure for connecting with the delivery channel and the oil injection equipment is provided on the upper mold. The external pressure sleeve is a thin-walled elastic metal sleeve structure.

[0014] The top and bottom of the expansion sleeve are both provided with microporous structures, which penetrate the expansion sleeve and the external pressure sleeve and extend to the oil injection area in the expansion sleeve. The pressure oil body is grease.

[0015] In a preferred embodiment, the cutting part includes a cutting punch and a floating bearing seat. The cutting punch is fixedly mounted on the bottom of the upper mold, and the floating bearing seat is slidably mounted on the top of the lower mold through an elastic sliding support. A cutting structure is formed between the bottom edge of the upper mold corresponding to the punching bearing seat and the punching bearing seat. The adjacent surfaces of the cutting punch and the floating bearing seat are both set to a planar structure, and a heating structure is provided inside the cutting punch and the floating bearing seat.

[0016] In a preferred embodiment, the bending and forming part includes a forming pressure head and a bending supporting seat, the forming pressure head is installed at the bottom of the upper mold, the bending supporting seat is fixedly installed on the top of the lower mold, a side extrusion head is arranged inside the bending supporting seat, the forming pressure head is connected to the upper mold through a connecting seat, the connecting seat is vertically slidably installed on the bottom of the upper mold through an elastic sliding support, a wedge-shaped pressure column is fixedly installed at the bottom of the upper mold, and a socket is provided at the position corresponding to the wedge pressure column on the bending supporting seat, a wedge-shaped push block is fixedly connected to the side extrusion head, and the wedge push block slides away from the end of the side extrusion head and extends into the socket, and mutually matching inclined surfaces are provided between the wedge pressure column and the wedge push block.

[0017] In a preferred embodiment, the top of the forming press head is rotatably connected to the connecting seat at one end close to the cutting portion, and a rotating elastic member is provided between the forming press head and the connecting seat. The rotating elastic member is used to make the top of the forming press head fit with the connecting seat and maintain a horizontal state. A pull rope is provided at the end of the top of the forming press head away from the cutting portion, and the pull rope is fixedly connected to the bending support seat.

[0018] In a preferred embodiment, a circulation channel is provided inside the forming pressure head, and a water circulation input and output pipe group is also provided on the forming pressure head, and the input pipe of the water circulation input and output pipe group is connected to the cold water delivery component.

[0019] In a preferred embodiment, a mechanical blanking assembly is provided on the side of the punch assembly facing away from the strip feeding assembly. The mechanical blanking assembly includes a clamping jaw provided to cooperate with the forming press head, and the clamping jaw is installed on a telescopic manipulator.

[0020] In a preferred embodiment, cylindrical slides are provided on all sides of the forming part of the forming press head, and an outer top ball is slidably provided in the cylindrical slide. The outer top ball is clearance-matched with the cylindrical slide. A storage cavity is provided inside the forming press head, and a pressurized injection pipe connected to the storage cavity is provided on the forming press head. The pressurized injection pipe is connected to another set of oil injection equipment, which is used to inject pressure oil into the storage cavity. The pressure oil is grease, and the cylindrical slide is connected to the storage cavity through a connecting channel.

[0021] The beneficial effect of the present invention is that the present invention controls the expansion of the external pressure sleeve after punching, and then when the mold is separated, the external pressure sleeve rises synchronously with the punching column. Since the external pressure sleeve has already expanded slightly outward at this time, the diameter becomes larger than the diameter of the hole. Therefore, when rising, the external pressure sleeve will form an upward extrusion on the downward protruding structure formed at the bottom edge of the hole, and cooperate with the downward pressure of the covering plate that has not yet risen at this time, so that the above-mentioned protruding structure is reversely deformed and flattened, thereby reducing the downward protruding structure at the bottom of the hole, so that during bending, the forming accuracy of the material is higher and the surface is smoother, and there is no excessive deformation due to the extrusion of the external forming surface during bending, which will cause extrusion of the forming pressure head and is not conducive to unloading, thereby improving the processing efficiency and processing accuracy of the punching machine. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0023] Figure 2 It is a three-dimensional view of the progressive die assembly of the present invention.

[0024] Figure 3 It is a schematic diagram of the overall structure of the progressive die assembly of the present invention.

[0025] Figure 4This is a state diagram of the progressive mold assembly of the present invention during overall mold closing operation.

[0026] Figure 5 Schematic diagram of the internal structure of the bending forming part of the present invention during bending forming.

[0027] Figure 6 This is a schematic diagram of the solution of controlling the tilt of the forming pressure head to discharge the material in the present invention.

[0028] Figure 7 This is a schematic diagram of the present invention's solution of using a clamping claw to clamp the formed product for unloading.

[0029] Figure 8 For the present invention Figure 4 A magnified view of the structure of part A.

[0030] Figure 9 This is a state diagram of the present invention when the punching column rises and the expansion sleeve expands outward to reversely extrude and punch out the protruding structure at the bottom of the hole when the mold is started to be split.

[0031] Figure 10 This is a structural schematic diagram of the present invention in which a cooling component is arranged inside the forming press head.

[0032] Figure 11 This is a schematic structural diagram of the present invention in which an external top ball is arranged inside the forming press head.

[0033] Figure 12 For the present invention Figure 11 Enlarged view of the structure of part B.

[0034] Figure 13 This is a schematic diagram of the structure of the square grooved tube formed product that needs to be processed.

[0035] Figure 14 This is a schematic diagram of the structure of the round grooved tube formed product that needs to be processed.

[0036] Figure 15 This is a schematic diagram of the downward protruding structure formed when the bottom edge of the hole in the punching part is punched downward by the punching head in the traditional process.

[0037] Figure 16 This is a schematic diagram of the state in which the hole in the bending forming part is excessively deformed toward the forming head due to the reverse extrusion of the forming surface in the traditional process.

[0038] The accompanying drawings are marked as follows: 1. Punch assembly; 11. Steel frame; 12. Slide; 13. Workbench; 14. Drive system; 2. Progressive die assembly; 201. Upper die; 202. Lower die; 21. Punching portion; 211. Punching column; 2111. Punching head; 2112. Expansion sleeve; 2113. External pressure sleeve; 212. Punching bearing seat; 213. Punching matching hole; 214. Covering plate; 22. Cutting portion; 221. Cutting punch; 222. Floating bearing seat; 23. Bending and forming portion; 231. Forming press head; 2311 , circulation channel; 2312, water circulation input and output pipe group; 2313, cylindrical slide; 2314, external top ball; 2315, storage chamber; 2316, connecting channel; 2317, pressurized injection pipe; 232, bending bearing seat; 233, molding groove; 234, side extrusion head; 235, connecting seat; 236, wedge-shaped pressure column; 237, wedge-shaped push block; 3, strip feeding assembly; 4, strip; 41, cutting piece; 42, molded product; 401, hole; 5, pull rope; 6, clamping claw; 61, telescopic manipulator. DETAILED DESCRIPTION

[0039] The present application is described in further detail below in conjunction with the accompanying drawings. It is necessary to point out that the following specific implementation methods are only used to further illustrate the present application and cannot be understood as limiting the scope of protection of the present application. Technicians in this field can make some non-essential improvements and adjustments to the present application based on the above application content.

[0040] Refer to the instruction manual Figures 1 to 12 A high-precision and strong steel frame punch press includes a punch press assembly 1, a progressive die assembly 2 and a strip feeding assembly 3. The punch press assembly 1 includes a steel frame 11, on which a slider 12 and a workbench 13 are provided. The slider 12 is driven by a drive system 14 to move vertically on the steel frame 11. Among them, the drive system 14 is a mature solution for the punch press system, and this embodiment will not be explained in detail. The progressive die assembly 2 includes an upper die 201 and a lower die 202. The upper die 201 is fixedly mounted on the bottom of the slider 12, and the lower die 202 is fixedly mounted on the top of the workbench 13. The strip feeding assembly 3 is used to transport the strip 4 to the middle of the progressive die assembly 2 and drive the strip 4 to move when the slider 12 controls the upper die 201 to rise (i.e., parting the mold). The progressive die assembly 2 consists of three parts: a punching part 21, a cutting part 22 and a bending and forming part 23.

[0041] For details, please refer to the attached manual. Figure 3 and Figure 4The punching part 21 includes a punching column 211 and a punching bearing seat 212. The punching column 211 is fixedly installed on the bottom of the upper mold 201, and the punching bearing seat 212 is fixedly installed on the top of the lower mold 202. A punching head 2111 is fixedly installed on the bottom of the punching column 211, and punching matching holes 213 are provided on the punching bearing seat 212 at positions corresponding to each punching column 211. When the mold is closed (that is, the slider 12 drives the upper mold 201 to descend and drives the punching column 211 to descend), the punching head 2111 extrude the strip 4 and passes through the punching matching hole 213 to complete the punching operation.

[0042] The cutting part 22 includes a cutting punch 221 and a floating bearing seat 222. The cutting punch 221 is fixedly mounted on the bottom of the upper mold 201, and the floating bearing seat 222 is slidably mounted on the top of the lower mold 202 through an elastic sliding support. A cutting structure is formed between the bottom edge of the upper mold 201 corresponding to the punching bearing seat 212 and the punching bearing seat 212. Specifically, after the strip 4 is conveyed to the floating bearing seat 222, when the mold is closed, the cutting punch 221 descends and forms a corresponding shear on the strip 4 with the punching bearing seat 212, thereby cutting the strip 4 into a cutting piece 41. The cut cutting piece 41 is temporarily stored on the floating bearing seat 222, and then when the strip feeding assembly 3 continues to convey the strip 4, the cutting piece 41 is pushed to the bending forming part 23 for subsequent processing.

[0043] The bending and forming portion 23 includes a forming press head 231 and a bending support seat 232. The forming press head 231 is mounted on the bottom of the upper mold 201, and the bending support seat 232 is fixedly mounted on the top of the lower mold 202. A side extrusion head 234 is provided inside the bending support seat 232. The bottom of the forming groove 233 is mainly adapted to form the lower structure of the molded product 42, and the relative extrusion of the two sets of side extrusion heads 234 is to extrude and form the upper structure of the molded product 42. Specifically, when the mold is closed, the forming press head 231 first presses the cutting piece 41 downward into the forming groove 233, so that the cutting piece 41 becomes a U-shaped structure. At this time, the bottom of the cutting piece 41 has been completely fitted with the forming press head 231 and the forming groove 233, and the shaping is completed. Then, it is only necessary to control the relative movement of the two sets of side extrusion heads 234 and extrude and form the upper material of the cutting piece 41, so that the cutting piece 41 is bent and formed into the molded product 42.

[0044] The strip feeding assembly 3 can adopt the feeding and conveying structure commonly used in stamping processing, such as conveying rollers, etc., which will not be explained in detail in this embodiment. The top of the punching support seat 212, the top of the floating support seat 222 and the top of the bending support seat 232 can be provided with a slide structure that is compatible with the strip 4, that is, in the mold separation state, the top of the punching support seat 212, the top of the floating support seat 222 and the top of the bending support seat 232 form a complete conveying channel. As the strip feeding assembly 3 is continuously fed, the strip 4 is continuously moved, and the cut piece 41 can be directly pushed to the bending support seat 232 to complete continuous processing and continuous automatic loading.

[0045] It should be noted that this embodiment is mainly aimed at the attached Figure 13 The square grooved tube type molded product 42 shown in the figure, therefore, the extrusion of the side extrusion head 234 is mainly aimed at the 90° bend of the horizontal structure at the top of the molded product 42. When facing molded products 42 of other shapes, such as the ones in the appendix of the manual, Figure 14 In the circular grooved tube-type molded product 42 shown, or other structures with upper and lower parting, the side extrusion head 234 can be adapted to extrude the upper semicircular arc portion of the molded product 42. Since the material itself has certain rebound characteristics, during actual bending and forming, based on the principle of overcorrection, the above-mentioned forming and corresponding extrusion degree need to be slightly larger than the actual size of the final molded product 42, that is, the actual size of the molding head 231 should be slightly smaller than the size of the inner cavity shape of the final molded product 42. That is to say, after parting, after the molding head 231 brings the molded product 42 out of the bending support seat 232, due to the rebound of the material, the molded product 42 will have a certain small gap with the molding head 231, thereby facilitating material cutting.

[0046] However, in the above embodiment, in the traditional solution, when punching, due to long-term use and the characteristics of the material itself, the following problems may occur after punching: Figure 15 The bottom edge of the hole 401 shown in the figure forms a slight protrusion structure that is deformed downward. Although this slight protrusion structure is within the allowable error of the product and does not affect the final use of the product, if it is directly ignored, then during the subsequent bending forming, the forming surface of the forming groove 233 and the side extrusion head 234 will form a strong extrusion on the material, which will easily lead to excessive reverse protrusion deformation of the material near the hole 401. Figure 16 The excessive protruding deformation will cause excessive fit to the molding press head 231, making it difficult to remove the molded product 42 during subsequent mold separation, affecting processing efficiency and processing accuracy.

[0047] To this end, this embodiment provides the following technical solutions, see the attached manual Figure 8 and Figure 9The punching part 21 also includes a covering plate 214, which is vertically slidably installed under the upper mold 201 through an elastic sliding support, and the covering plate 214 is arranged corresponding to the punching bearing seat 212. The position of the covering plate 214 corresponding to the punching column 211 is provided with a perforation for the punching column 211 to pass through. Then, when the mold is actually closed, the covering plate 214 will contact the strip 4 in advance, forming a pressing limit for the strip 4, and then perform a precise punching operation. The part of the punching column 211 located above the punching head 2111 is provided with an inward shrinkage section, that is, the diameter of this section is smaller than the diameter of the punching head 2111, and an external pressure sleeve 2113 is provided on the outside of the inward shrinkage section. The punching column 211 is also provided with an expansion control component for controlling the expansion of the external pressure sleeve 2113. When the mold is parted, the upper mold 201 rises, driving the punch The hole column 211 rises synchronously. Before rising, the outer pressure sleeve 2113 starts to rise below the hole 401 that has been formed in the strip 4. Since the outer pressure sleeve 2113 has expanded slightly outward at this time and its diameter becomes larger than the diameter of the hole 401, the outer pressure sleeve 2113 will squeeze the downward protruding structure formed at the bottom edge of the hole 401 upward when rising, and cooperate with the downward pressure of the covering plate 214 that has not yet risen at this time to make the above-mentioned protruding structure deform in the opposite direction and be flattened, thereby reducing the downward protruding structure at the bottom of the hole 401, so that the forming accuracy of the material is higher and the surface is smoother during bending and forming, and the forming pressure head 231 will not be squeezed due to the extrusion of the external forming surface during bending, which is not conducive to unloading, thereby improving the processing efficiency and processing accuracy of the punching machine.

[0048] For example, the outer pressure sleeve 2113 can directly adopt a thick-walled metal sleeve structure, and a conical structure is set on the top of the outer pressure sleeve 2113, and a heating structure for heating the outer pressure sleeve 2113 to expand it is set in the punching head 2111. The bottom of the outer pressure sleeve 2113 contacts the punching head 2111 to form a restriction, and then before the mold is separated, the outer pressure sleeve 2113 is first heated to expand it, and then its diameter is larger than the diameter of the hole 401 (then the heating can be stopped). As it rises, the conical structure on the top of the expanded outer pressure sleeve 2113 can first contact the protruding structure at the bottom of the hole 401, and cooperate with the downward pressure of the covering plate 214 to form a reverse extrusion on the protruding structure, thereby causing it to be extruded and deformed upward. After the outer pressure sleeve 2113 contacts the hole 401, the heating of the outer pressure sleeve 2113 is stopped, and its surface temperature will be conducted by the strip 4, thereby causing contraction (a cooling structure can also be directly set to shrink), which will not affect the overall rise of the punching column 211.

[0049] In addition, although the above structure is simple, the specific temperature is not easy to control. To achieve precise control, an effective monitoring system is required, which is costly. For this reason, the present embodiment also provides the following technical solutions. Specifically, an expansion sleeve 2112 (such as a rubber sleeve) is provided on the inner side of the outer pressure sleeve 2113. The expansion sleeve 2112 is fixedly mounted on the inwardly contracted section of the punching column 211. The punching column 211 is provided with a delivery channel for delivering pressure oil to the expansion sleeve 2112. The upper mold 201 is provided with a docking pipe structure for connecting with the delivery channel and an oil injection device such as an oil injection pump, so that the expansion sleeve 2112 is docked with the oil injection device. Before mold separation, oil is injected into the expansion sleeve 2112 to expand the expansion sleeve 2112 and drive the outer pressure sleeve 2113 to expand (the outer pressure sleeve 2113 can be made of a thin-walled elastic metal sleeve structure, such as a thin-walled steel strip curled and The sleeve structure is formed, and the metal sleeve can produce adaptive elastic deformation under pressure, or it can adopt a coil structure with a straight plate curling, but the diameter of the two ends is not fixed and can be changed. When the expansion sleeve 2112 expands, it can drive the external pressure sleeve 2113 to deform outward, that is, expand), and then when the punching column 211 rises, the downward protruding structure at the bottom of the hole 401 can be reversely extruded with the help of the expanded external pressure sleeve 2113, thereby reducing the protruding effect. Moreover, since the upper and lower ends of the external pressure sleeve 2113 are fixedly connected to the punching column 211, only the middle part is formed with an oil injection area. Therefore, when it expands, the middle part bulges outward first, which is conducive to the external pressure sleeve 2113 forming a gradual extrusion structure. When the external pressure sleeve 2113 completely enters the hole 401, it will be reversely extruded and reset by the hole 401, without affecting the size of the hole 401.

[0050] In addition, the above-mentioned pressure oil body is preferably grease (lubricating oil is also acceptable), and the top and bottom of the expansion sleeve 2112 are both provided with a microporous structure, which penetrates the expansion sleeve 2112 and the outer pressure sleeve 2113 and extends to the oil injection area in the expansion sleeve 2112. The microporous structure is used to ensure that after the grease in the expansion sleeve 2112 reaches a certain pressure and causes the punching bearing seat 212 to bulge, as the grease continues to be input, the pressure continues to increase, and after the punching bearing seat 212 has reached its deformation limit, excess grease will seep out from the microporous structure, thereby lubricating the surface of the outer pressure sleeve 2113, and then the outer pressure sleeve 2113 only protrudes from the bottom of the hole 401. It forms extrusion rather than friction, which provides certain protection for the external pressure sleeve 2113. In addition, when the punching column 211 continues to rise, although the oil injection equipment stops injecting oil, after the protruding structure at the bottom of the hole 401 is reversely squeezed, the external pressure sleeve 2113 continues to enter the hole 401, thereby causing the hole 401 to form an extrusion on the external pressure sleeve 2113, so that the grease in the expansion sleeve 2112 is squeezed out and scraped to the bottom of the hole 401, and then in the subsequent process of continuing to convey and advance the strip 4, it can avoid the residual protruding structure at the bottom of the hole 401 from scratching and wearing the corresponding surface parameters of the mold, thereby providing a certain protection effect on the mold itself.

[0051] In addition, since the strip 4 needs to be cut at the cutting portion 22, the traditional cutting mold only needs to be provided with a cutter head part, but in this embodiment, the cutting punch 221 and the floating supporting seat 222 need to fully cover the material of the corresponding length, that is, the cutting piece 41 corresponding to the length of the formed product 42 after bending and forming is fully covered, and after cutting, when the floating supporting seat 222 descends to the lowest position, the cutting punch 221 can cooperate with the floating supporting seat 222 to fully flatten and extrude the cut cutting piece 41, and the cutting punch 221 and the floating supporting seat 222 are both provided with a heating structure inside to heat and preheat the cut cutting piece 41, thereby effectively flattening the residual protruding structure of the hole 401 on the cutting piece 41 with the corresponding burrs during cutting, and at the same time, the cutting piece 41 can be better bent and deformed after being transported to the bending and forming portion 23, thereby eliminating the deformation stress caused by the material being too hard.

[0052] Based on the above embodiment, since this embodiment eliminates the problem of the protruding structure formed at the bottom of the hole 401 during the punching process, that is, the product precision of the formed product 42 is higher during the bending forming, and there will be no local excessive deformation, which will cause excessive squeezing of the forming pressure head 231 and make it difficult to cut the material. Therefore, this embodiment provides a simple cutting method. For details, please refer to the attached manual. Figure 6The forming press head 231 is connected to the upper mold 201 through the connecting seat 235. The top of the forming press head 231 is connected to the connecting seat 235 at one end close to the cutting portion 22, and a rotating elastic member (such as a torsion spring, or other corresponding tension elastic members) is provided between the forming press head 231 and the connecting seat 235. The rotating elastic member is used to make the top of the forming press head 231 fit with the connecting seat 235 and maintain a horizontal state. The top of the forming press head 231 is provided with a pull rope 5 at one end away from the cutting portion 22. The pull rope 5 is connected to the bending support seat 2 32 is fixedly connected. When it is used specifically, when the mold is closed, the upper mold 201 descends, the drawstring 5 becomes loose, and the forming press head 231 is reset under the action of the torsion elastic member, fits with the connecting seat 235, maintains a precise position, presses down the cutting piece 41 placed on the top of the bending support seat 232, and performs subsequent extrusion deformation. After the molding is completed, when the mold is separated, the upper mold 201 gradually rises and tightens the drawstring 5. As the upper mold 201 continues to rise, the drawstring 5 will pull the outer end of the forming press head 231 downward, thereby causing the forming press head 231 to become as shown. Figure 6 In the tilted state shown, the formed product 42 can automatically slide down and separate from the forming pressure head 231 to complete the automatic unloading operation, and the punch assembly 1 can also be provided with a corresponding material guide trough and a collection device to collect the formed product 42.

[0053] In addition, for the molded product 42 with a relatively complex cross section, or when the pressure between the molded product 42 and the molding pressure head 231 is relatively large and relatively tight due to other reasons, this embodiment also provides the following blanking solution, refer to the attached manual. Figure 7 , and then set up a set of mechanical unloading components, which include a clamping claw 6 set to cooperate with the forming pressure head 231, and the clamping claw 6 is installed on the telescopic manipulator 61. The telescopic manipulator 61 can use a simple linear drive structure, such as a cylinder, a linear motor, etc., or a more sophisticated multi-degree-of-freedom manipulator structure, so that the clamping claw 6 can clamp the formed product 42 to complete automatic unloading.

[0054] In the above embodiment, if other factors in the processing process cause the molded product 42 to be in too tight contact with the molding pressure head 231 after molding, it is difficult to unload. If a mechanical structure is used to forcibly unload, it is easy to cause relative wear between the molded product 42 and the molding pressure head 231, affecting the service life of the mold. For this reason, this embodiment also provides the following solution. For example, since the cutting punch 221 and the cutting punch 221 have preheated the cutting piece 41 during the previous cutting, the molded product 42 itself has a certain temperature after bending and forming. At this time, the gap between the molded product 42 and the molding pressure head 231 can be increased by cooling the molding pressure head 231 to make it shrink. Refer to the attached manual for details. Figure 10That is, a circulation channel 2311 is provided inside the molding head 231, and a water circulation input and output pipe group 2312 is also provided on the molding head 231. The input pipe of the water circulation input and output pipe group 2312 is connected to the cold water delivery component (that is, the cold water pump and the corresponding pipeline). Then, after the mold is separated, cold water is circulated into the circulation channel 2311 to cool the molding head 231.

[0055] In addition, this embodiment also provides another way to increase the gap between the molded product 42 and the molding press head 231, refer to the appendix of the specification. Figure 11 , cylindrical slideways 2313 are provided around the molding part of the molding head 231, and an outer top ball 2314 is slidably provided in the cylindrical slideway 2313, and the outer top ball 2314 is clearance-matched with the cylindrical slideway 2313, and a storage cavity 2315 is provided inside the molding head 231, and a pressurized injection pipe 2317 communicating with the storage cavity 2315 is provided on the molding head 231, and the pressurized injection pipe 2317 is connected to another set of oiling equipment, which is used to inject lubricating oil or grease, preferably grease, into the storage cavity 2315, and the cylindrical slideway 2313 is communicated with the storage cavity 2315 through the communicating channel 2316, and then after the mold is parted, the oiling equipment can be controlled to inject lubricating oil or grease into the storage cavity 2315. Grease is continuously injected into the storage chamber 2315, and the grease will form an outward pushing pressure on the outer top ball 2314 in the cylindrical slide 2313, thereby forming a top pressure on the molded product 42, and then increasing the gap between the molded product 42 and the molding head 231. At the same time, as the grease is continuously injected, excess grease will be squeezed out from the gap between the outer top ball 2314 and the cylindrical slide 2313, filling the gap between the molded product 42 and the cylindrical slide 2313, forming a lubrication effect, thereby making the unloading of the molded product 42 easier and safer, and the excess grease on the surface of the molding head 231 can also continue to be used as a lubricating material when the molded product 42 is bent and formed.

[0056] In the above embodiment, the extrusion operation of the side extrusion head 234 can adopt a separate driving device, or a structure linked with the upper mold 201 to reduce the use of energy equipment, for example, referring to the attached manual Figure 5The connecting seat 235 is vertically slidably installed on the bottom of the upper mold 201 through an elastic sliding support. A wedge-shaped pressure column 236 is fixedly installed on the bottom of the upper mold 201. A socket is provided at the position corresponding to the wedge pressure column 236 on the bending bearing seat 232. A wedge-shaped push block 237 is fixedly connected to the side extrusion head 234. The end of the wedge push block 237 away from the side extrusion head 234 slides and extends to the socket. There is a wedge pressure column 236 and a wedge push block 237 between them. The upper mold 201 drives the wedge-shaped pressure column 236 to continue to press down, so that the inclined surfaces of the wedge-shaped pressure column 236 and the inclined surfaces of the wedge-shaped push block 237 cooperate with each other, thereby forming a lateral extrusion of the side extrusion head 234, pushing the side extrusion head 234 to move horizontally to form an extrusion bend on the cutting piece 41.

[0057] It should be noted that the elastic sliding support members used in the above-mentioned multiple places mainly play the role of sliding guide and providing elastic force. For example, a combination structure of a sliding column and a spring is used, the sliding column is used to vertically guide the corresponding structure, and the spring is used to provide elastic support and corresponding buffering for the corresponding structure. In addition, any other structure that can achieve the above-mentioned purpose can also be used as an elastic sliding support member.

[0058] The above-described embodiments merely illustrate several implementations of the present invention. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that a person skilled in the art would be able to make numerous variations and improvements without departing from the spirit of the present invention, and all such variations and improvements fall within the scope of protection of the present invention.

Claims

1. A high-precision, strong steel frame punch press, characterized by: It comprises a punch assembly (1), wherein a progressive die assembly (2) is provided on the punch assembly (1); The progressive die assembly (2) comprises an upper die (201) and a lower die (202), wherein the upper die (201) and the lower die (202) are respectively mounted on a slide (12) and a workbench (13) of the punch assembly (1), and the progressive die assembly (2) comprises a punching portion (21), a cutting portion (22) and a bending and forming portion (23); The punching portion (21) comprises a punching column (211) and a punching support seat (212); a punching head (2111) is fixedly mounted on the bottom of the punching column (211); and punching matching holes (213) are provided on the punching support seat (212); the punching head (2111) extrude the strip (4) and pass through the punching matching holes (213), forming a hole (401) after the punching operation is completed; The punching portion (21) further comprises a covering plate (214), the covering plate (214) being vertically slidably mounted below the upper die (201) via an elastic sliding support, and a through hole for allowing the punching column (211) to pass through is provided on the covering plate (214) at a position corresponding to the punching column (211); The punching column (211) is provided with an inwardly contracted section at a portion located above the punching head (2111), an outer pressure sleeve (2113) is provided outside the inwardly contracted section, and an expansion control component for controlling the expansion of the outer pressure sleeve (2113) is also provided on the punching column (211); The expansion control component is an expansion sleeve (2112), the expansion sleeve (2112) is arranged on the inner side of the outer pressure sleeve (2113), the expansion sleeve (2112) is fixedly mounted on the inwardly contracted section of the punching column (211), an oil injection area is provided on the inner side of the middle portion of the expansion sleeve (2112), a delivery channel for delivering pressure oil to the oil injection area in the expansion sleeve (2112) is provided in the punching column (211), a butt-joint pipe structure for connecting with the delivery channel and the oil injection equipment is provided on the upper mold (201), and the outer pressure sleeve (2113) is a thin-walled elastic metal sleeve structure; The top and bottom of the expansion sleeve (2112) are both provided with a microporous structure, which penetrates the expansion sleeve (2112) and the external pressure sleeve (2113) and extends to the oil injection area in the expansion sleeve (2112), and the pressure oil body is grease; The bending forming portion (23) comprises a forming press head (231) and a bending bearing seat (232), wherein the forming press head (231) is mounted on the bottom of the upper die (201), and the bending bearing seat (232) is fixedly mounted on the top of the lower die (202); The top of the forming press head (231) is rotatably connected to the connecting seat (235) at one end close to the cutting portion (22), and a rotating elastic member is provided between the forming press head (231) and the connecting seat (235), and the rotating elastic member is used to make the top of the forming press head (231) fit with the connecting seat (235) and maintain a horizontal state. The top of the forming press head (231) is provided with a drawstring (5) at one end away from the cutting portion (22), and the drawstring (5) is fixedly connected to the bending bearing seat (232); When the expansion sleeve (2112) expands, it drives the external pressure sleeve (2113) to deform outward. When the punching column (211) rises, the downward protruding structure at the bottom of the hole (401) is reversely extruded by the expanded external pressure sleeve (2113). The extrusion of the external forming surface during bending will not form an excessively deformed portion, which will cause extrusion on the forming pressure head (231) and be detrimental to unloading.

2. A high-precision strong steel frame punch press according to claim 1, characterized in that: The punch assembly (1) includes a steel frame (11), the slider (12) is driven by a drive system (14) to move vertically on the steel frame (11), the workbench (13) is fixedly mounted on the steel frame (11), the punching column (211) is fixedly mounted on the bottom of the upper die (201), and the punching bearing seat (212) is fixedly mounted on the top of the lower die (202). A strip feeding assembly (3) is provided on the outside of the punch assembly (1), and the strip feeding assembly (3) is used to convey and drive the strip (4) to move.

3. A high-precision strong steel frame punch press according to claim 2, characterized in that: The cutting portion (22) includes a cutting punch (221) and a floating bearing seat (222), wherein the cutting punch (221) is fixedly mounted on the bottom of the upper die (201), and the floating bearing seat (222) is slidably mounted on the top of the lower die (202) via an elastic sliding support member, and a cutting structure is formed between the bottom edge of the punching bearing seat (212) corresponding to the upper die (201) and the punching bearing seat (212), and the adjacent surfaces of the cutting punch (221) and the floating bearing seat (222) are both configured as planar structures, and a heating structure is provided inside the cutting punch (221) and the floating bearing seat (222).

4. A high-precision strong steel frame punch press according to claim 3, characterized in that: A side extrusion head (234) is provided inside the bending bearing seat (232), the forming pressure head (231) is connected to the upper mold (201) through a connecting seat (235), the connecting seat (235) is vertically slidably installed on the bottom of the upper mold (201) through an elastic sliding support, a wedge-shaped pressure column (236) is fixedly installed on the bottom of the upper mold (201), a socket is provided at a position corresponding to the wedge-shaped pressure column (236) on the bending bearing seat (232), a wedge-shaped push block (237) is fixedly connected to the side extrusion head (234), the wedge-shaped push block (237) slides and extends into the socket at one end away from the side extrusion head (234), and mutually matching inclined surfaces are provided between the wedge-shaped pressure column (236) and the wedge-shaped push block (237).

5. The high-precision strong steel frame punch press according to claim 4, characterized in that: A circulation channel (2311) is provided inside the molding head (231), and a water circulation input and output pipe group (2312) is also provided on the molding head (231), wherein the input pipe of the water circulation input and output pipe group (2312) is connected to a cold water delivery component.

6. The high-precision strong steel frame punch press according to claim 5, characterized in that: A mechanical blanking assembly is provided on the side of the punch assembly (1) facing away from the strip feeding assembly (3), and the mechanical blanking assembly includes a clamping jaw (6) provided to cooperate with the forming press head (231), and the clamping jaw (6) is mounted on a telescopic manipulator (61).

7. The high-precision strong steel frame punch press according to claim 6, characterized in that: The molding part of the molding head (231) is provided with cylindrical slideways (2313) on all sides, and an outer top ball (2314) is slidably provided in the cylindrical slideway (2313). The outer top ball (2314) and the cylindrical slideway (2313) are clearance-matched. A storage cavity (2315) is provided inside the molding head (231). A pressurized injection pipe (2317) communicating with the storage cavity (2315) is provided on the molding head (231). The pressurized injection pipe (2317) is connected to another set of oil injection equipment, which is used to inject a pressure oil body into the storage cavity (2315). The pressure oil body is grease. The cylindrical slideway (2313) is communicated with the storage cavity (2315) through a connecting channel (2316).

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