An operating method and device for opening and closing a stamping die

Abstract

The present invention provides an operation method and device for opening and closing a stamping die, including: an upper die base, a lower die base, a positioning and guiding seat, a lifting hook, an outer guide sleeve, an outer guide pillar, a positioning and guiding head assembly, and a hydraulic jack; outer guide sleeves are provided at both ends of the bottom of the upper die base, and positioning and guiding seats are symmetrically arranged between the outer guide sleeves; the lifting hooks are respectively fixedly installed on the side positions of the upper die base and the lower die base through screws, and the other ends of the lifting hooks are connected to lifting chains to lift the upper die base and the lower die base through a crane device; screw holes are provided on the upper die base for fixedly connecting the lifting hooks and the positioning and guiding seats; outer guide pillars corresponding to the outer guide sleeves of the upper die base are provided on the lower die base, and a hydraulic jack is provided on the lower die base, and the hydraulic jack is fixedly connected to the lower die base through socket head cap screws. The structure of the present invention is simple, the cost is low, the versatility is strong, it can be used for mobile operations, the repetition accuracy is high, the application is wide, and it is convenient to implement standardization.

Description

Technical Field

[0001] The present invention relates to the technical field of molds, and specifically to an operation method and device for opening and closing a stamping mold. Background Art

[0002] During the process of mold manufacturing and mold repair and maintenance, the upper and lower molds of the mold are frequently assembled or disassembled. When the upper and lower molds of traditional medium and small-sized mold mechanisms are opened and closed, only a hoist is used for lifting and lowering. However, due to uneven handling by the hoist, especially in the case of precision molds, the guide pillars are often stuck, and mold technicians need to deal with it by knocking, which causes damage to the mold. Such an operation not only reduces the accuracy of the mold, but also causes serious heat generation and wear of the guide pillars and guide sleeves during use, resulting in a short mold life.

[0003] Currently, most electromagnetic flat die closing machines are used in the market. However, due to the high cost and limited on-site mobility of current electromagnetic flat die closing machines, they have not been applied to the assembly or disassembly operations of the upper and lower molds of stamping molds larger than large-sized molds. On the other hand, when using a punch press to open and close the mold, due to the limitation of the hoist tonnage, even for large and extra-large molds, the upper and lower molds must be lifted separately. During the mold closing and lifting process, the port guiding fillets of the precise outer guide pillars and outer guide sleeves are relatively small and not within the visual range of people, making it difficult to accurately achieve centering. Although the current jacks can be used to solve the problem of the parallelism of the upper and lower mold bases and can well achieve mold opening, due to the large frictional force generated between the upper and lower mold surfaces and the jacks, the relative movement of the upper and lower molds fails, and it is still easy to cause the outer guide pillars and outer guide sleeves to be stuck. Summary of the Invention

[0004] The technical problem solved by the present invention is to provide an operation method and device for opening and closing a stamping mold to solve the problems raised in the above background art.

[0005] The technical problem solved by the present invention is achieved by the following technical solutions: An operation method and device for opening and closing a stamping mold, including: an upper mold base, a lower mold base, a positioning and guiding seat, a hook, an outer guide sleeve, an outer guide pillar, a positioning and guiding head assembly, a hydraulic jack; the upper mold base is provided with a positioning and guiding seat installed in the mold closing safety area between the upper and lower mold bases, and includes outer guide sleeves and hooks configured according to the classification weights of extra-large, large, medium, and small stamping molds. The mold closing safety areas of the upper mold base are symmetrically arranged in 4 or 2 according to the mold size, and 4 screw holes are distributed in each safety area to achieve the assembly with the guiding and positioning seat.

[0006] Preferably, the positioning and guiding seat includes: a guide sleeve, a base, and an internal hexagonal screw. The guide sleeve and the base are press-fitted by interference fit, and the base is fixedly installed on the upper mold base through the internal hexagonal screw.

[0007] Preferably, the inner chamfer at the front end of the guide sleeve is a 15° to 20° chamfered bell mouth, the rounded corner of the bell mouth guide structure transitions to the rear end straight rise position, and the straight rise position between the guide sleeve and the positioning guide head is a clearance fit.

[0008] Preferably, the hook is fixedly installed on the side positions of the upper mold base and the lower mold base by screws respectively, and the other end of the hook is connected to a lifting chain, and the upper mold base and the lower mold base are lifted and lowered by a crane. The connection structure between the hook and the upper mold base is a detachable connection structure, and the hook is used for a crane to lift the upper mold base and place it flat on the positioning guide head assembly.

[0009] Preferably, the positioning guide assembly is composed of an adjustment pad, a positioning guide head and a hexagon socket screw. The adjustment pad is arranged below the positioning guide head. The adjustment pad adjusts the start and end distance of the mold opening and closing. The positioning guide head and the guide sleeve of the positioning guide seat play an automatic guiding role. The positioning guide head assembly is fixed to the top of the hydraulic jack piston rod that has been placed on the positioning pin of the lower mold seat through the hexagon socket screw. The positioning guide head is 45# steel quenched and tempered or Cr12 material surface hardened. The front end is rounded to transition to the rear end straight lifting position, and the straight lifting position between the above-mentioned guide sleeve is a clearance fit. The adjustment pad is configured according to the mold closing height, and finally it is ground and adjusted according to the parallel accuracy of the upper and lower mold seats debugged by the opening and closing system of the four-point variable frequency synchronous hydraulic press used.

[0010] Preferably, the hydraulic jack is composed of a piston rod, a cylinder body, a high-pressure joint and a cylinder head. The piston rod is made of 42CrMo forged steel material, with a threaded hole built into the top end, and an overflow hole and a sealing groove at the bottom end; the bottom end is equipped with a sealing ring and precisely slides with the inner cavity of the cylinder body. The cylinder body is made of cast steel material, and the inner cavity is precisely ground. The side wall near the bottom end is connected to the high-pressure joint. The bottom surface of the axis is provided with a positioning hole and the clearance with the non-knurled hexagon socket screw head installed on the lower die seat is matched to realize the positioning of the hydraulic jack. The cylinder head is provided with a sealing groove for mounting a sealing ring, which is encapsulated with the end of the cylinder body and is coaxial with the cylinder body to form a precise sliding fit with the inner cavity of the piston rod. One end of the high-pressure joint is tightly fixed to the cylinder body, and the other end is connected to a four-point variable frequency synchronous hydraulic press.

[0011] Preferably, the adjusting pad is configured according to the mold closing height of the mold, and can be ground and adjusted according to the parallel accuracy of the upper and lower mold bases.

[0012] Preferably, the lower die base is composed of an outer guide column, a limit column and a positioning hexagon socket screw, etc., and is first placed on the mold frame by a crane; usually the fulcrum of the mold frame is located in the safety area marked at both ends of the lower die base.

[0013] Preferably, the upper and lower die bases are usually directly assembled on the die base with an outer guide bushing, an outer guide pillar, a limit block, and a buffer air jack. The inner guide pillar and inner guide bushing are assembled on the template, and the lower die base is marked with a safety area where a hydraulic jack capable of horizontally supporting the upper die base can be placed.

[0014] Preferably, an operation method for opening and closing a stamping die: In the state where the die is closed, first use the hydraulic jack to smoothly push out the outer guide bushing and outer guide pillar, and then use a crane device to lift the upper die base; in the state where the die is open, first place the lower die base stably through the crane device, and then hoist the upper die base to the positioning guide head of the positioning guide head assembly of the raised hydraulic jack installed on the positioning screw of the lower die base. Then, the upper die base descends with the crane device, and is automatically positioned through the positioning guide head and positioning guide seat. Then, the surface of the positioning guide head is in smooth contact with the surface of the upper die base. Then, the hydraulic jack is depressurized, leading the upper die base to descend smoothly. Then, it contacts with the outer guide bushing and outer guide pillar and automatically and precisely realizes the die closing of the upper die base and the lower die base.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows: The present invention is convenient to operate, time-saving and labor-saving; through the initial positioning adjustment of the hydraulic jack, it is avoided that when the upper and lower die bases are closed, the outer guide pillar is stuck in the outer guide bushing due to the inclination of the upper die base, resulting in damage to the die and reduction of the die precision; at the same time, the present invention has a simple structure, low cost, strong versatility, movable operation, high repeated precision, wide application and convenient implementation of standardization. The present invention connects components such as the hydraulic jack and the positioning guide assembly to the die base through bolts, which is convenient to replace and move according to the weight and size of the die base, avoiding the inconvenience in use in the fixed mode, thus reducing the labor intensity, improving the die opening and closing efficiency, avoiding damage to the die base caused by manual knocking in the case of the traditional die closing where the outer guide pillar and outer guide bushing are stuck, further improving the die stability, extending the service life of the die, and reducing the production operation cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a three-dimensional structure schematic diagram of the upper and lower die closing of the present invention;

[0017] Figure 2 is a front view structure schematic diagram of the upper and lower die closing of the present invention;

[0018] Figure 3 is a front view structure schematic diagram of the upper and lower die separation of the present invention;

[0019] Figure 4 is of the present invention Figure 3 B-B direction structure schematic diagram;

[0020] Figure 5 is of the present invention Figure 4 partial enlarged schematic diagram;

[0021] Figure 6 Isometric schematic diagram of the positioning and guiding seat of the present invention.

[0022] In the attached drawings, the list of components represented by each reference numeral is as follows:

[0023] 1 - upper die holder, 11 - lifting hook, 12 - outer guide bushing, 13 - screw hole, 2 - lower die holder, 21 - outer guide pillar, 22 - socket head cap screw, 3 - hydraulic jack, 31 - piston rod, 32 - cylinder block, 33 - high-pressure joint, 34 - cylinder head, 4 - positioning and guiding seat, 41 - guide bushing, 42 - base, 43 - socket head cap screw, 5 - positioning and guiding head assembly, 51 - adjusting pad, 52 - positioning and guiding head, 53 - socket head cap screw. Specific embodiments

[0024] In order to make the implementation means, creative features, achieved purposes and effects of the present invention easy to understand, the present invention will be further described below with reference to specific drawings.

[0025] As Figures 1 to 6 shown, a method and device for opening and closing a stamping die include: a method and device for opening and closing a stamping die, including: upper die holder 1, lower die holder 2, positioning and guiding seat 4, lifting hook 11, outer guide bushing 12, outer guide pillar 21, positioning and guiding head assembly 5, hydraulic jack 3; the upper die holder 1 is provided with a positioning and guiding seat 4 installed in the safe area for closing the upper and lower die holders, and includes outer guide bushings 12 and lifting hooks 11 configured according to the classification weights of extra-large, large, medium and small stamping dies. The safe area for closing the upper die holder 1 is symmetrically provided with 4 or 2 according to the die size, and 4 screw holes are distributed in each safe area to realize the assembly with the guiding and positioning seat 4; the socket head cap screws can be flush with the bottom of the positioning and guiding seat 4 to avoid the protrusion of the screws affecting subsequent installation; the positioning and guiding seat 4 includes: a guide bushing 41, a base 42, and a socket head cap screw 43. The guide bushing 41 and the base 42 are press-fitted by interference fit, and the base 42 is fixedly installed on the upper die holder 1 by the socket head cap screw 43; the inner chamfer at the front end of the guide bushing 41 is a chamfered bell mouth of 15° - 20°, and the chamfered bell mouth guiding structure is rounded to the rear end straight position. The straight position between the guide bushing 41 and the positioning and guiding head 52 is a clearance fit, which is convenient for exhausting air and can also realize the initial positioning function of closing die guiding; the lifting hook 11 is respectively fixedly installed on the side positions of the upper die holder 1 and the lower die holder 2 by screws. The other end of the lifting hook 11 is connected to a lifting chain, and the upper die holder 1 and the lower die holder 2 are lifted and lowered by a crane equipment. The connection structure between the lifting hook 11 and the upper die holder 1 is a detachable connection structure. The lifting hook 11 is used for the crane to hoist the upper die holder 1 and place it flat on the positioning and guiding head assembly 5.

[0026] The positioning guide assembly 5 is composed of an adjusting pad 51, a positioning guide head 52 and a hexagon socket screw 53. The adjusting pad 51 is arranged below the positioning guide head 52. The adjusting pad 51 adjusts the start and end distances of mold opening and closing. The positioning guide head 52 and the guide sleeve 41 of the positioning guide seat 4 play an automatic guiding role. The positioning guide head assembly 5 is fixed to the top of the hydraulic jack piston rod 31 that has been placed on the positioning pin of the lower mold seat 2 through the hexagon socket screw 53. The positioning guide head 52 is 45# steel quenched and tempered or Cr12 material surface hardened. The front end is rounded to transition to the rear end straight lifting position, and the straight lifting position between the above-mentioned guide sleeve 41 is a clearance fit; the adjusting pad 51 is configured according to the mold closing height, and finally it is ground and adjusted according to the parallel accuracy of the upper and lower mold seats debugged by the opening and closing system of the four-point variable frequency synchronous hydraulic press used.

[0027] The hydraulic jack 3 is composed of a piston rod 31, a cylinder body 32, a high-pressure joint 33 and a cylinder head 34. The piston rod 31 is made of 42CrMo forged steel material, with a threaded hole built into the top and an overflow hole and a sealing groove at the bottom; the bottom is equipped with a sealing ring and precisely slides with the inner cavity of the cylinder body 32. The cylinder body 32 is made of cast steel material, with the inner cavity precisely ground, and the side wall near the bottom is connected to the high-pressure joint 33. The bottom surface of the axis is provided with a positioning hole and the clearance of the non-knurled hexagon socket screw head installed on the lower die seat is matched to realize the positioning of the hydraulic jack; the cylinder head 34 is provided with a sealing groove for a sealing ring, which is sealed with the end of the cylinder body 32 and coaxial with the cylinder body 32 to form a precise sliding fit with the inner cavity of the piston rod 31. One end of the high-pressure joint 33 is tightly fixed to the cylinder body 32, and the other end is connected to the four-point variable frequency synchronous hydraulic press; the adjustment pad 51 is configured according to the mold closing height of the mold, and can be ground and adjusted according to the parallel accuracy of the upper and lower mold seats.

[0028] Preferably, the lower mold base 2 is composed of an outer guide column 21, a limit column and a positioning hexagon socket screw 22, etc., and is first placed on the mold frame by a crane; usually the fulcrum of the mold frame is located in the safety area marked at both ends of the lower mold base 2.

[0029] Preferably, the upper and lower mold bases are usually directly mounted on the mold base and have an outer guide sleeve 12, an outer guide column 21, a limit block, a buffer gas cap, an inner guide column and an inner guide sleeve mounted on the template, and the lower mold base is marked with a safety zone, and a hydraulic jack 3 that can horizontally support the upper mold base 1 can be placed.

[0030] Preferably, an operating method for opening and closing a stamping die: In the state where the die is closed, first, the outer guide sleeve 12 and the outer guide pillar 21 are smoothly pushed out by the hydraulic jack 3, and then the upper die base 1 is lifted by the overhead crane equipment; in the state where the die is open, the lower die base 2 is first placed stably by the overhead crane equipment, and then the upper die base 1 is hoisted onto the positioning guide head 52 of the positioning guide head assembly 5 on the raised hydraulic jack 3 installed on the positioning screw of the lower die base 2. Then, the upper die base 1 descends with the overhead crane equipment, is automatically positioned through the positioning guide head 52 and the positioning guide seat 4, and then the head surface of the positioning guide 52 is in smooth contact with the surface of the upper die base 1. Then, the hydraulic jack 3 is depressurized, driving the upper die base 1 to fall stably. Then, the outer guide sleeve 12 and the outer guide pillar 21 come into contact and automatically and precisely achieve the die closing of the upper die base 1 and the lower die base 2.

[0031] In summary, the principle of this embodiment is as follows: The upper die base 1 is lifted onto the lower die base 2 by an external hoisting device. The piston rod 21 of the hydraulic jack 3 on the safety area of the lower die base 2 is raised so that its height is greater than that of the outer guide pillar 21. The upper die base 1 is lowered so that the guide sleeves 41 with clearance fit on both sides with the positioning guide head 52 are stuck on the positioning guide head 52. The clearance fit prevents the upper die base 1 from being stuck when there is a certain inclination during the hoisting process, thereby performing preliminary positioning. Through the adjustment of the hydraulic jack 3 and the adjustment of the adjustment pad 51 according to the actual situation, the required precision is achieved so that the outer guide sleeve 12 on the upper die base 1 is perpendicular to the outer guide pillar 21 on the lower die base 2. Then, the pressure is reduced to lower the piston rod 21, and the upper die base 1 and the lower die base 2 complete precise die closing.

[0032] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. What is described in the above embodiments and the specification only illustrates the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed. The scope of protection claimed by the present invention is defined by the appended claims and their equivalents.

Claims

1. A die opening and closing device for a stamping die, characterized in that: It includes: An upper die base, a lower die base, a positioning and guiding seat, a lifting hook, an outer guide sleeve, an outer guide pillar, a positioning and guiding head assembly, and a hydraulic jack. The upper die base contains a positioning and guiding seat installed in the die closing safety area between the upper and lower die bases, and includes outer guide sleeves and lifting hooks configured according to the classification weights of extra-large, large, medium, and small stamping dies. The die closing safety areas of the upper die base are symmetrically arranged with 4 or 2 according to the die size. There are 4 screw holes distributed in each safety area to achieve the fitting with the guiding and positioning seat; The positioning and guiding seat includes: a guide sleeve, a base, and an inner hexagon screw. The guide sleeve and the base are press-fitted by interference fit, and the base is fixedly installed on the upper die base through the inner hexagon screw; The inner chamfer at the front end of the guide sleeve is a 15° - 20° chamfered bell mouth. The bell mouth guiding structure has a rounded corner transition to the rear straight position. The lifting hooks are respectively fixedly installed on the side positions of the upper die base and the lower die base through screws. The other end of the lifting hook is connected to a lifting chain, and the upper die base and the lower die base are lifted and lowered by a crane equipment. The connection structure between the lifting hook and the upper die base is a detachable connection structure. The lifting hook is used for the crane to hoist the upper die base and place it flat on the positioning and guiding head assembly; The positioning and guiding head assembly is composed of an adjusting pad, a positioning and guiding head, and an inner hexagon screw. The adjusting pad is arranged below the positioning and guiding head. The adjusting pad adjusts the starting and ending distances of die opening and closing. The positioning and guiding head and the guide sleeve of the positioning and guiding seat play an automatic guiding role. The positioning and guiding head assembly is fixedly installed on the top of the piston rod of the hydraulic jack placed on the positioning pin of the lower die base through the inner hexagon screw. The positioning and guiding head is made of 45# steel quenched and tempered or Cr12 material surface hardened. The front end has a rounded corner transition to the rear straight position. The straight position between the guide sleeve and the positioning and guiding head is a clearance fit. The adjusting pad is configured according to the die closing height of the die, and finally, it is ground and adjusted according to the parallelism accuracy of the upper and lower die bases debugged by the die opening and closing system of the four-point variable-frequency synchronous hydraulic press used; The hydraulic jack is composed of a piston rod, a cylinder body, a high-pressure joint, and a cylinder head. The piston rod is made of 42CrMo forged steel. There is a threaded hole inside its top end, and an overflow hole and a sealing groove are opened at the bottom end; a sealing ring is installed at the bottom end and is in precise sliding fit with the inner cavity of the cylinder body. The cylinder body is made of cast steel, and the inner cavity is precisely ground. There is a hole near the bottom end on the side wall connected to the high-pressure joint. There is a positioning hole at the bottom center of the shaft in clearance fit with the head of the non-knurled inner hexagon screw installed on the lower die base to achieve the positioning of the hydraulic jack. The cylinder head is provided with a sealing groove for installing a sealing ring. One end of the high-pressure joint is tightly fixed to the cylinder body, and the other end is connected to the four-point variable-frequency synchronous hydraulic press; In the state where the mold is closed, first use a hydraulic jack to smoothly push out the outer guide sleeve and the outer guide pillar, and then use a crane to lift the upper die base; in the state where the mold is open, first place the lower die base stably with the crane, and then hoist the upper die base to the positioning guide head of the positioning guide head assembly of the raised hydraulic jack installed on the positioning screw of the lower die base. Then, as the crane descends, the upper die base is automatically positioned through the positioning guide head and the positioning guide seat. Then, the positioning guide head surface is in smooth contact with the upper die base surface. Then, the hydraulic jack is depressurized, leading the upper die base to fall smoothly. Then, it contacts the outer guide sleeve and the outer guide pillar and automatically and precisely realizes the mold closing of the upper die base and the lower die base.

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