Die structure giving consideration to development, mass production and die holder universality and development method thereof

Abstract

The die structure comprises a split female die, a split male die, a blank holder, an upper die base and a lower die base, a plurality of U-shaped mounting grooves are evenly formed in the bottom of the split female die and the split male die in the circumferential direction, and a first guide structure is arranged on the inner ring face of the blank holder; a second guiding structure in sliding fit with the first guiding structure is arranged on the peripheral face of the split male die, a guiding inserting plate is detachably installed on the peripheral face of the split female die, a guiding inserting groove in sliding fit with the guiding inserting plate is formed in the periphery of the blank holder, the upper die base and the lower die base are of a plate type structure, and an upper die base guiding base is matched with a lower die base guiding leg for guiding. According to the die structure, fixing, guiding and supporting structures which are both used in the soft die development stage and the normal die mass production stage are designed at the same time, the split concave-convex die and the blank holder which are successfully developed can be continuously used after heat treatment is completed, the upper die base and the lower die base are subjected to universal design and can be matched with different dies to be repeatedly used, and therefore the die development period is shortened, and the production efficiency is improved. The development cost is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of mold development, and in particular to a mold structure and a development method thereof that take into account development, mass production and mold base versatility. Background Art

[0002] China's automobile industry has been developing rapidly for nearly 20 years, and the speed of vehicle model replacement has been accelerating. As a necessary part of the mass production development of new models, the development of automobile cover parts molds accounts for a large part of the new car development tooling costs. The fundamental reasons for the high mold costs in the mold development process include: 1. After the old models are completely withdrawn from the market, the concave split punch and the mold base can only be treated as scrap iron and cannot be reused. The long-term deferred expenses of the molds added for each model increase the asset cost; 2. The soft molds used for prototype trials and small-batch production proofing in the early stage of new model development are discarded after the mass production molds are successfully developed. They cannot continue to be used in mass production, thereby increasing development costs;

[0003] The side panel drawing dies in the prior art are basically external guide dies, also called box guides, which include upper and lower die bases, split punches, split concave dies and blank holders. They are highly targeted and their structural form can only meet the use of the model during mass production. The soft mold structure in the development process cannot be further used due to the inability to assemble with the die base structure. In addition, since the structural form of the upper and lower die bases is difficult to match the concave and split punch structures of other models, the die base is not universal.

[0004] Therefore, as an important part of automobile development, in order to reduce the cost of automobile development, the structural form of the mold should be designed for both compatibility and versatility, and a mold development method that is suitable for reducing costs and improving efficiency should be proposed. Summary of the invention

[0005] The purpose of the present invention is to overcome the defects in the prior art and provide a mold structure and a development method thereof that take into account development, mass production and mold base versatility, so as to overcome one or more problems caused by the limitations and defects of the relevant technology to a certain extent.

[0006] In order to achieve the above object, the technical solution of the present invention is as follows:

[0007] A mold structure that takes into account development, mass production and universality of a mold base, comprising a split die, a split punch, a blank holder, an upper mold base and a lower mold base, wherein the bottoms of the split die and the split punch are respectively uniformly arranged with a plurality of U-shaped mounting grooves in the circumferential direction;

[0008] Development stage; through the U-shaped installation groove, the split die is installed on the upper table of the machine tool, and the split punch is installed on the lower table of the machine tool; the blank holder is supported on the lower table by a floating support system; a first guide structure is provided on the inner ring surface of the upper edge of the blank holder, and a second guide structure is provided on the outer peripheral surface of the split punch. The second guide structure and the first guide structure are slidably matched to guide the Z-direction floating of the blank holder; a plurality of guide plugs extending downward are detachably installed on the outer peripheral surface of the split die, and a plurality of guide slots are opened on the outer periphery of the blank holder. The guide plugs are slidably matched with the guide slots to guide the Z-direction stamping of the split die;

[0009] Mass production stage; the upper die base and the lower die base are plate structures, the upper mounting surface is processed on the lower plane of the upper die base, and the lower mounting surface is processed on the upper plane of the lower die base, and the strengthened split die and split punch are respectively installed on the upper mounting surface and the lower mounting surface through U-shaped mounting grooves; the upper die base is symmetrically extended downward on both sides to form two guide seats, and multi-directional guide grooves are arranged on the guide seats, and two guide legs are symmetrically raised on both sides of the lower die base to form two guide legs, and the guide legs are slidably matched with the guide grooves to guide the Z-direction stamping of the upper die base and the split die, and the pressure ring is supported on the lower table by the floating support system and guided by the second guide structure; a number of limit blocks are designed on the front and back sides of the upper die base and the lower die base along the Z-direction, and the limit blocks on the upper die base are aligned with the limit blocks on the lower die base directly below it and cooperate to achieve stamping limit; a number of column holes penetrating the lower die base are vertically opened on the lower mounting surface to make way for the floating support system.

[0010] Furthermore, the floating support system includes a number of gas cap support columns arranged directly below the blank holder ring. The gas cap support columns are evenly distributed in a ring shape corresponding to the shape of the blank holder ring. The gas cap support columns are a two-stage plug-in structure, which includes a base column and a connecting column. The base column is inserted into the gas rod hole of the lower table, and the connecting column is passed through the column hole to adapt to the thickness of the lower mold base during the mass production stage.

[0011] Furthermore, a plurality of evenly distributed limit grooves are provided along the lower end of the outer circumference of the blank holder, and a plurality of limit installation holes for installing the limit rod are provided on the lower die base, and the upper end of the limit rod is clamped in the limit groove to prevent the blank holder from being dislocated.

[0012] Furthermore, positioning U grooves for quick positioning are respectively arranged on both sides of the split punch, the positioning U grooves are located on the quick positioning line of the lower die base, and positioning pins are respectively arranged along the quick positioning line of the lower die base for cooperating with the positioning U grooves for positioning.

[0013] Furthermore, quick positioning grooves are also provided on both sides of the lower die base, and the quick positioning grooves are arranged on the quick positioning line. A machine tool positioning pin is provided on the lower table along its center line. The machine tool positioning pin cooperates with the quick positioning groove for positioning, which is used for quick positioning of the lower die base.

[0014] Furthermore, the second guide structure includes several first guide plates located on the front and rear sides of the split punch and several second guide plates on the left and right sides. The guide surfaces of the first guide plates are parallel to the front plane, and the second guide plates are parallel to the side plane. The first guide plates and the second guide plates protrude outside the peripheral surface of the split punch.

[0015] A method for developing a mold structure that takes into account development, mass production, and mold base versatility, comprising the following steps:

[0016] S1: In the soft mold design stage, the U-shaped installation grooves of the split die and the split punch and the limit groove distribution design on the blank holder are consistent with the distribution of the sliding installation grooves on the upper and lower tables of the machine tool, and the location design of the positioning U groove of the split punch is consistent with the distribution of the machine tool positioning pins on the center line of the lower table; the location design of the U-shaped installation groove, the limit groove and the positioning U groove needs to reserve a safe distance from the center of the gas rod hole on the lower table; the split die, split punch and blank holder in the soft mold stage are not heat treated;

[0017] S2: In the soft mold development stage, the split die and split punch are installed using the machine tool installation system, including connecting the U-shaped installation groove with the machine tool pressure plate assembly, aligning and adjusting the split die and split punch, and locking the pressure plate assembly to fix the split die and split punch; installing the floating support system, the gas cap support column only uses the base column, the gas cap support column is inserted into the gas rod hole on the lower table, and the gas cap support column is arranged in a ring according to the blank holder ring structure. The blank holder ring sliding sleeve is installed outside the split punch and supported by the floating support system, and the machine tool's own stroke limit assembly is installed. The stroke limit assembly cooperates with the limit groove to limit; installing the guide plug plate on the split die to complete the slidable assembly between the split die, the blank holder ring and the split punch; performing the profile processing of the split die, the blank holder ring and the split punch after the split die, the blank holder ring and the split punch are combined according to the process regulations;

[0018] S3: After the soft mold is successfully developed, the machine tool coordinate system is established based on the center line on the lower table, and the positioning coordinates of the split die, split punch, blank holder and floating support system on the machine tool are recorded. The machining coordinate system determined by the rapid positioning line of the lower die base is adapted and coincided with the machine tool coordinate system, and the mounting holes on the upper die base and the lower die base and the column holes on the lower die base are processed using the various positioning coordinates;

[0019] S4: Entering the mass production stage, heat treatment is performed on the split die, split punch and blank holder according to the process regulations;

[0020] S5: Remove the guide plug plate, assemble the mold, assemble the split die, split punch and blank holder to the upper die base and the lower die base through the mounting holes, and install the upper die base and the lower die base on the upper table and the lower table respectively.

[0021] Furthermore, during the mold assembly process, the assembly error caused by heat treatment deformation is taken into consideration, and a thin pad is provided under the split die, the split punch and the blank holder to eliminate the assembly error.

[0022] Compared with the prior art, the mold structure and development method of the present invention that takes into account development, mass production and mold base versatility have the following beneficial effects:

[0023] The mold structure takes into account the fixed, guiding and supporting structures used in both the soft mold development stage and the normal mold mass production stage, so that the successfully developed split concave mold, split punch and blank holder can continue to be used after the heat treatment is completed. At the same time, the upper and lower mold bases are designed for universality, changing the guiding and fixing methods of the mold base and the concave split punch and blank holder of the traditional structure. The upper and lower mold bases can be matched with other cover part drawing dies for repeated use, thereby shortening the overall development cycle of the mold and reducing the development cost of the mold; the mold structure development method proposes specific details of the comprehensive design and universal design, and uses the machine tool installation coordinates of the successfully developed soft mold to directly process the installation structure of the mold base, shortening the mold base development cycle and assembly time, and efficiently ensuring assembly accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is an assembly exploded view of the soft mold disclosed in the present invention;

[0025] Figure 2 It is an assembly explosion diagram of the mold structure disclosed in the present invention;

[0026] Figure 3 This is a front view of the soft mold disclosed in the present invention assembled on a machine tool;

[0027] Figure 4 This is a three-dimensional picture of the blank holder being assembled on the lower machine table;

[0028] Figure 5 This is a bottom view of the lower die base.

[0029] In the figure: 1. split punch; 1a. second guide structure; 1b. U-shaped mounting groove; 2. pressure ring; 2a. guide slot; 2b. first guide structure; 2c. limit slot; 3. split die; 4. guide plug plate; 5. lower die seat; 5a. guide leg; 5b. quick positioning slot; 5c. column hole; 5d. pin hole; 6. upper die seat; 6a. limit seat; 6b. guide seat; 7. gas cap support column; 8. limit rod; 9. lower table; 9a. sliding mounting groove; 9b. gas rod hole; 9c. machine tool pin hole; 10. upper table; 11. pressure plate assembly. DETAILED DESCRIPTION

[0030] The following will be combined with the accompanying drawings of the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only the best embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention;

[0031] like Figure 1-Figure 5 , the present embodiment provides a mold structure that takes into account development, mass production and mold base versatility, mainly referring to the side wall drawing mold structure, this type of mold structure includes a split die 3, a split punch 1, a blank holder 2, an upper mold base 6 and a lower mold base 5. The split die 3, the split punch 1 and the blank holder 2 do not need to be heat treated in the development stage because of the need for surface processing. The split die 3, the split punch 1 and the blank holder 2 in the development stage are collectively referred to as soft molds. The development time of soft molds is long, and the prior art generally discards the soft molds after successful development. Therefore, the structural design of the soft mold does not consider the design details of the normal mold in the mass production stage, and the design of the normal mold does not consider the design details in the soft mold processing; in addition, the side wall drawing mold of the prior art is highly targeted. First, the split die 3 is installed in the upper mold base 6, and second, the blank holder 2 cooperates with the outer guide of the lower mold base 5, resulting in the upper and lower mold bases being unable to be universal;

[0032] Thus, the mold structure of the present technical solution is derived. In order to facilitate flexible installation and fixation on the machine tool and the upper and lower mold bases 5, the split concave mold 3 and the split convex mold 1 are respectively provided with a plurality of U-shaped installation grooves 1b evenly arranged on the bottom in the circumferential direction. Figure 1 As shown, the split die 3 is easy to assemble, and its U-shaped installation groove 1b can be located on the step surface of the bottom plate of the split die 3. The split punch 1 is inserted into the blank holder 2, and its peripheral space is insufficient. Therefore, the peripheral surface of the split punch 1 is concave to form an operation and accommodation space for the U-shaped installation groove 1b.

[0033] During the development stage, the soft mold is directly assembled on the machine tool. The installation system configured on the machine tool includes a pressure plate assembly 11, a stroke limit assembly, a machine tool positioning pin and a gas rod hole 9b. Positioning U grooves for rapid positioning are arranged on both sides of the split punch 1 (not shown in the figure, and its structure is the same as that of the rapid positioning groove 5b). The machine tool positioning pins on the center line of the machine tool are used to quickly locate the position of the split punch 1; a plurality of sliding installation grooves 9a are provided on the upper table 10 and the lower table 9 of the machine tool, and the pressure plate assembly 11 and the stroke limit assembly are slid and clamped in the sliding installation groove 9a. The pressure plate assembly 11 cooperates with the U-shaped installation groove 1b to realize the positioning and installation of the split die 3 and the split punch 1; a floating support system is inserted in the machine tool gas rod hole 9b to support the blank holder 2, and the stroke limit assembly is pushed into the sliding installation groove 9a. The stroke limit assembly cooperates with the limit groove 2c at the lower end of the outer periphery of the blank holder 2 to limit the stroke of the blank holder 2;

[0034] As for the guide of the soft mold, since there is no sliding guide between the upper table 10 and the lower table 9, it is considered to make a guide on the soft mold to take into account both development and mass production. The relative sliding guide between the split punch 1 and the blank holder 2 adopts an internal guide, such as Figure 1 and Figure 4 As shown, a first guide structure 2b is provided on the inner ring surface of the pressure ring 2, and a second guide structure 1a matching the first guide structure 2b is provided on the outer circumference of the split punch 1. Since the outer circumference of the split punch 1 and the inner circumference of the pressure ring 2 are curved surfaces with extremely irregular shapes, and are nested and assembled with each other, the upper ends of both are extended and protruding surfaces, so the first guide structure 2b and the second guide structure 1a need to be distributed and arranged to adapt to the curved surface. In order to improve the guidance of the only degree of freedom in the Z direction and its guiding accuracy, the second guide structure 1a includes several first guide plates located on the front and rear sides of the split punch 1 and several second guide plates located on the left and right sides. The outer circumference of the split punch 1 is raised to form the installation plane of the first guide plate and the second guide plate, and the flatness is guaranteed, wherein the first guide plates located on the front and rear sides should be parallel to the positive plane, that is, Figure 1 In the plane of the viewing direction shown, the second guide plate is parallel to the side plane, the side plane is along the Z direction and perpendicular to the front plane, the first guide plate and the second guide plate are installed on the installation plane, and the first guide structure 2b is arranged according to the same distribution structure;

[0035] The relative sliding guide between the split die 3 and the blank holder 2 adopts an external guide, and a plug plate groove is provided on the peripheral surface of the split die 3. The plug plate groove is detachably installed with a guide plug plate 4. At the same time, a plurality of guide slots 2a are processed on the outer periphery of the blank holder 2. Similarly, the groove bottom surfaces of the guide slots 2a on the front and rear sides of the blank holder 2 are parallel to the front plane, and the groove bottom surfaces of the guide slots 2a on the left and right sides are parallel to the side plane. The inner plane of the guide plug plate 4 cooperates with the groove bottom surface of the guide slot 2a to realize the guidance of the split die 3 in the Z direction with the only degree of freedom. Since the cooperation guidance of the guide plug plate 4 and the guide slot 2a is only used in the trial production process of the soft mold, no guide plate is required to be arranged in the guide slot 2a.

[0036] The split die 3 is installed on the upper table 10 of the machine tool through the U-shaped installation groove 1b, and the split punch 1 is installed on the lower table 9 of the machine tool; the blank holder 2 is supported on the lower table 9 by a floating support system; a first guide structure 2b is provided along the inner ring surface of the blank holder 2, and a second guide structure 1a is provided on the outer peripheral surface of the split punch 1. The second guide structure 1a and the first guide structure 2b are slidably matched and guided to guide the Z-direction floating of the blank holder 2; a plurality of guide insert plates 4 extending downward are detachably installed on the outer peripheral surface of the split die 3, and a plurality of guide slots 2a are opened on the outer periphery of the blank holder 2. The guide insert plates 4 and the guide slots 2a are slidably matched to guide the Z-direction stamping of the split die 3;

[0037] During the mass production stage; since the soft mold of the above structure fully considers the technical details of the normal mold, the successfully developed soft mold can be reused as a normal mold after heat treatment. In order to adapt to the installation of the developed mold structure and make comprehensive considerations on versatility; different from the prior art, the upper mold base 6 and the lower mold base 5 are designed as plate structures, and their size structure does not need to adapt to the shape of the soft mold. The lower plane of the upper mold base 6 is processed into a horizontal upper mounting surface, and the upper plane of the lower mold base 5 is processed into a horizontal lower mounting surface. At the same time, mounting holes are processed at corresponding positions on the upper mounting surface and the lower mounting surface. The split concave mold 3 and the split punch 1 are respectively connected to the The U-shaped mounting groove 1b is connected and fixedly mounted on the upper mounting surface and the lower mounting surface; at the same time, two guide seats 6b are integrally formed by symmetrically extending downward on both sides of the upper die seat 6, and a guide groove is provided in the guide seat 6b. The guide groove has a front and rear guide groove plane parallel to the front plane and a groove side surface parallel to the side plane. Guide plates can be detachably provided on the front and rear guide groove planes and the groove side surfaces. Two guide legs 5a are symmetrically convexly formed on both sides of the lower die seat 5. Similarly, guide plates are provided on the planes of the guide legs 5a that cooperate with the front and rear guide groove planes and the groove side surfaces for sliding guides respectively. The guide between the upper and lower die seats 5 replaces the Z-direction stamping guide of the split die 3 during the soft mold development stage;

[0038] The front and rear sides of the upper die seat 6 and the lower die seat 5 are also protruded along the upper end in the Z direction to form a plurality of limit seats 6a, and the limit seats 6a on the upper die seat 6 are aligned with the limit seats 6a on the lower die seat 5 directly below it and cooperate to achieve stamping limit;

[0039] According to the distribution pattern of the gas rod holes 9b on the lower table 9 of the machine tool, a plurality of column holes 5c are opened vertically and through the lower die base 5 on the lower mounting surface of the lower die base 5, which are used to pass through the floating support system. In order to adapt to the different support length requirements in the soft mold development stage and the mass production stage, the floating support system includes a number of gas cap support columns 7 arranged directly below the blank holder 2 for support. The gas cap support column 7 is a two-stage pluggable structure, which includes a base column and a connecting column. The length of the connecting column should be adapted to the plate thickness of the lower die base 5. In the soft mold development stage, the base column can be used as the support of the blank holder 2. The base columns are evenly distributed in a ring shape corresponding to the shape of the blank holder 2; in the mass production stage, according to the arrangement of the base columns, the connecting columns are passed through the corresponding column holes 5c and plugged into the upper end of the base columns;

[0040] In addition, a threaded mounting hole for the limit rod 8 is processed on the lower mounting surface of the lower die base 5, and the upper end of the limit rod 8 is clamped on the limit groove 2c to prevent the blank holder 2 from being dislocated;

[0041] In order to quickly locate the split punch 1, positioning U grooves for quick positioning are arranged on both sides of the split punch 1. The two positioning U grooves are arranged in a collinear manner, and the line is defined as a quick positioning line. The quick positioning line is generally the symmetrical center line of the lower die seat 5, such as Figure 4As shown, a row of pin holes 5d are provided on the lower die base 5 along its rapid positioning line according to the distribution law of the machine tool, or a special pin hole 5d is opened according to the spacing between the two positioning U-grooves combined with the distribution law of the machine tool, and the positioning pin inserted in the pin hole 5d cooperates with the positioning U-groove to limit the lateral and longitudinal degrees of freedom of the split punch 1 and quickly locate the position of the split punch 1.

[0042] The two sides of the lower die base 5 are also provided with quick positioning grooves 5b, such as Figure 5 As shown, similarly, the straight line determined by the two collinearly arranged quick positioning grooves 5b is the quick positioning line of the lower die base 5, as shown in FIG. Figure 5 As shown, machine tool locating pins are arranged along the center line of the lower table 9 of the machine tool. The machine tool locating pins are located in the machine tool pin holes 9c. The machine tool locating pins cooperate with the quick locating grooves 5b for positioning. Firstly, the lower die base 5 can be positioned quickly. Secondly, it is conducive to the quick conversion of the machine tool coordinate system and the lower die base coordinate system.

[0043] Combined with the above mold structure design scheme, a mold structure development method that takes into account development, mass production and mold base versatility is proposed, including the following steps:

[0044] S1: In the soft mold design stage, comprehensive considerations must be made in the design of the mold structure to improve the adaptability of the mold structure. The installation system structure of the machine tool cannot be changed. In order to improve the versatility of the normal mold, the U-shaped installation groove 1b of the split die 3 and the split punch 1 and the limit groove 2c on the pressure ring 2 are designed to conform to the distribution of the sliding installation groove 9a of the upper table 10 and the lower table 9 of the machine tool. The positioning U groove position of the split punch 1 and the quick positioning groove 5b of the lower die seat 5 are designed to conform to the distribution of the machine tool positioning pin on the center line of the lower table 9 of the machine tool. This consideration should be At least including the hole spacing rule, hole size and the original hole position safety spacing on the upper and lower mold bases 5, the position design of the U-shaped installation groove 1b, the limit groove 2c and the positioning U groove needs to reserve a safety spacing with the center of the gas rod hole 9b on the lower table 9, according to the distribution rule of the gas rod hole 9b, make a screw hole installation position selection guide table and specification, the U-shaped installation groove 1b and the limit groove 2c and other installation grooves in the soft mold design are selected or designed according to the guide table and specification, so as to facilitate the design and processing of the corresponding installation holes on the lower mold base 5, which is conducive to improving the mold base structure strength and its versatility;

[0045] The split concave mold 3, the split convex mold 1 and the blank holder 2 in the soft mold stage are not subjected to heat treatment;

[0046] S2: In the soft mold development stage, the split die 3, the split punch 1 and the pressure ring 2 are installed using the installation system of the machine tool. First, the split punch 1 is positioned and installed. Two pin holes 5d at appropriate positions on the lower table 9 of the machine tool are selected. The positioning U grooves on both sides of the split punch 1 are aligned with the two pin holes 5d and then the machine tool positioning pins are inserted to achieve rapid positioning. The pressure plate assembly 11 is pushed from the sliding installation groove 9a into the positioning U groove. The studs of the pressure plate assembly 11 are matched with the end holes of the positioning U groove. The upper pressure plate is tightened along the studs of the pressure plate assembly 11 so that the upper pressure plate and the lower pressure plate clamped in the sliding installation groove 9a jointly clamp the positioning U groove between the two. After the split die 3 and the split punch 1 are matched and aligned, the split die 3 is fixed using the pressure plate assembly 11 according to the above method.

[0047] Install floating support systems, such as Figure 4 As shown, if there is an inner ring in the blank holder 2, the inner ring limit stroke assembly should be pushed into the blank holder 2 through the sliding installation groove 9a first, and the appropriate gas rod hole 9b is selected according to the structure of the blank holder 2 and the inner ring to arrange the gas cap support column 7 in a ring shape. The gas cap support column 7 only uses a base column section, and the base column section is inserted in the gas rod hole 9b on the lower table 9. The blank holder 2 sliding sleeve is installed outside the split punch 1, and the inner ring is inserted in the guide cavity inside the split punch 1, and is floatingly supported by the base column section at the bottom of each. The limit stroke assembly configured for the machine tool is installed, and the limit stroke rod of the limit stroke assembly cooperates with the limit groove 2c, and a limit plate is provided on the top thereof to limit the maximum floating stroke of the blank holder 2 or the inner ring; the guide plug plate 4 on the split die 3 is installed, and the guide plug plate 4 cooperates with the guide slot 2a to complete the slidable assembly between the split die 3, the blank holder 2 and the split punch 1;

[0048] According to the process specification, the profile profiling of the split die 3, the blank holder 2 and the split punch 1 after the split die 3, the blank holder 2 and the split punch 1 are combined;

[0049] S3: After the soft mold is successfully developed, the upper mold base 6 and the lower mold base 5 are processed according to the installation information of the soft mold. Since the adaptive installation structure design of the split die 3, the split punch 1 and the blank holder 2 is fully considered in the development stage, when processing the upper mold base 6 and the lower mold base 5, the positioning and installation information of the machine tool is directly used for processing;

[0050] The machine tool coordinate system is established by combining the center line on the lower table 9 with the pin hole 5d or the symmetry line of the lower table 9, and the positioning coordinates of the split die 3, the split punch 1, the blank holder 2 and the floating support system on the machine tool are recorded respectively. The positioning coordinates are mainly two-dimensional coordinates in the horizontal dimension. Several pin holes 5d can be processed in advance on the installation surface along its rapid positioning line according to the distribution law of the pin holes 5d on the lower table 9 of the machine tool. According to the actual structural size of the split punch 1, it is moved according to the unit spacing of the sliding installation groove 9a to adapt to the lower installation surface domain, so that the processing coordinate system determined by the rapid positioning line of the lower die base 5 is adapted and coincided with the machine tool coordinate system. Using the established coordinate system, various mounting holes and column holes 5c on the lower die base 5 are processed with reference to the recorded positioning coordinates. The upper die base 6 and the lower die base 5 are arranged in a mirror image and have a matching relationship. The corresponding coordinate system of the upper die base 6 can be quickly obtained by reference conversion, and various mounting holes on the upper die base 6 can be processed according to the recorded positioning coordinates.

[0051] S4: Entering the mass production stage, heat treatment is performed on the split die 3, the split punch 1 and the blank holder 2 according to the process regulations;

[0052] S5: Normal assembly of the mold in the mass production stage. Use screw assemblies to connect the U-shaped mounting grooves 1b of the split die 3 and the split punch 1 with the corresponding mounting holes. The gas cap support column 7 is connected with the base column and the connecting column. The blank holder 2 is installed, and the length of the limit rod 8 on the limit groove 2c of the blank holder 2 is adjusted to set the maximum floating stroke. In the mold assembly process, considering the assembly error caused by heat treatment deformation, a thin pad is set under the split die 3, the split punch 1 and the blank holder 2 to eliminate the assembly error.

[0053] In a normal mold, the split die 3 is guided by the upper die base 6 and the lower die base 5, so the guide plate 4 used in the soft mold development stage is removed;

[0054] The lower die base 5 is quickly positioned on the lower table 9 using the quick positioning groove 5b on the upper die base 6 and the lower die base 5. A plurality of U-shaped mounting grooves 1b are also circumferentially arranged at the bottom of the upper die base 6 and the lower die base 5. The upper die base 6 and the lower die base 5 are fixedly mounted using the press plate assembly 11 of the machine tool.

[0055] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A mold structure that takes into account development, mass production and mold base versatility, characterized by: It comprises a split die, a split punch, a blank holder, an upper die seat and a lower die seat, and the bottoms of the split die and the split punch are respectively provided with a plurality of U-shaped mounting grooves evenly arranged in the circumferential direction; Development stage; through the U-shaped mounting groove, the split die is mounted on the upper table of the machine tool, and the split punch is mounted on the lower table of the machine tool; the blank holder is supported on the lower table by a floating support system; a first guide structure is provided on the inner ring surface of the upper edge of the blank holder, and a second guide structure is provided on the outer peripheral surface of the split punch, and the second guide structure is slidably matched with the first guide structure for guiding the Z-direction floating of the blank holder; a plurality of guide inserts extending downward are detachably mounted on the outer peripheral surface of the split die, and a plurality of guide slots are provided on the outer periphery of the blank holder, and the guide inserts are slidably matched with the guide slots for guiding the Z-direction stamping of the split die; Mass production stage; the upper die seat and the lower die seat are plate structures, the upper mounting surface is processed on the lower plane of the upper die seat, and the lower mounting surface is processed on the upper plane of the lower die seat, and the split concave die and the split convex die after strengthening treatment are respectively installed on the upper mounting surface and the lower mounting surface through the U-shaped mounting groove; the upper die seat is symmetrically extended downward on both sides to form two guide seats, and a multi-directional guide groove is arranged on the guide seat, and the lower die seat is symmetrically raised on both sides to form two guide legs, and the guide legs are slidably matched with the guide grooves , used to guide the Z-direction stamping of the upper die base and the split die, the pressure ring is supported on the lower table by the floating support system and guided by the second guide structure; a number of limit blocks protruding along the Z-direction are designed on the front and rear sides of the upper die base and the lower die base, the limit block on the upper die base is aligned with the limit block on the lower die base directly below it and cooperates to achieve stamping limit; a number of column holes penetrating the lower die base are vertically opened on the lower mounting surface to make way for the floating support system.

2. The mold structure according to claim 1 that takes into account both development, mass production and mold base versatility, characterized in that: The floating support system includes a plurality of gas cap support columns arranged directly below the blank holder ring. The plurality of gas cap support columns are evenly distributed in a ring shape corresponding to the shape of the blank holder ring. The gas cap support columns are two-stage pluggable structures, including a base column and a connecting column. The base column is inserted into the gas rod hole of the lower table surface, and the connecting column is passed through the column hole to adapt to the thickness of the lower mold base during the mass production stage.

3. The mold structure that takes into account development, mass production and mold base versatility according to claim 2 is characterized in that: A plurality of evenly distributed limit grooves are provided along the lower end of the outer circumference of the pressure ring, and a plurality of limit installation holes for installing the limit rod are provided on the lower die base. The upper end of the limit rod is clamped on the limit groove to prevent the pressure ring from being dislocated.

4. The mold structure that takes into account development, mass production and mold base versatility according to claim 3 is characterized in that: Positioning U grooves for quick positioning are respectively arranged on both sides of the split punch, and the positioning U grooves are located on the quick positioning line of the lower die seat. Positioning pins are respectively arranged along the quick positioning line on the lower die seat for cooperating with the positioning U grooves for positioning.

5. The mold structure according to claim 4 that takes into account both development, mass production and mold base versatility, characterized in that: Both sides of the lower die base are also provided with quick positioning grooves, and the quick positioning grooves are arranged on the quick positioning line. A machine tool positioning pin is provided on the lower table along its center line. The machine tool positioning pin cooperates with the quick positioning groove for positioning, and is used for quick positioning of the lower die base.

6. The mold structure that takes into account development, mass production and mold base versatility according to claim 1 is characterized in that: The second guide structure includes several first guide plates located on the front and rear sides of the split punch and several second guide plates on the left and right sides. The guide surfaces of the first guide plates are parallel to the front plane, and the second guide plates are parallel to the side plane. The first guide plates and the second guide plates protrude outside the peripheral surface of the split punch.

7. A method for developing a mold structure that takes into account development, mass production, and mold base versatility according to any one of claims 5 to 6, characterized in that: The following steps are involved: S1: In the soft mold design stage, the distribution design of the U-shaped installation groove of the split die and the split punch and the limiting groove on the blank holder is consistent with the distribution of the sliding installation grooves of the upper table and the lower table of the machine tool, and the position design of the positioning U groove of the split punch is consistent with the distribution of the machine tool positioning pins on the center line of the lower table; the position design of the U-shaped installation groove, the limiting groove and the positioning U groove needs to reserve a safe distance from the center of the gas rod hole on the lower table; The split concave mold, the split convex mold and the blank holder in the soft mold stage are not subjected to heat treatment; S2: In the soft mold development stage, the split concave mold and the split punch are installed using the installation system of the machine tool, including connecting the U-shaped installation groove with the machine tool pressure plate assembly, aligning and adjusting the split concave mold and the split punch, and locking the pressure plate assembly to fix the split concave mold and the split punch; installing the floating support system, the gas cap support column only uses the base column, the gas cap support column is inserted into the gas rod hole on the lower table, and the gas cap support column is arranged in a ring according to the blank holder ring structure. The blank holder ring sleeve is installed outside the split punch and supported by the floating support system, and the stroke limit component of the machine tool is installed, and the stroke limit component cooperates with the limit groove for limit; Install the guide plate on the split concave die to complete the slidable assembly between the split concave die, the blank holder and the split convex die; Performing surface profiling processing of the split concave die, the blank holder and the split convex die after they are combined according to the process specifications; S3: After the soft mold is successfully developed, a machine tool coordinate system is established with the center line on the lower table, and the positioning coordinates of the split die, the split punch, the blank holder and the floating support system on the machine tool are recorded. The machining coordinate system determined by the rapid positioning line of the lower die base is adapted and coincided with the machine tool coordinate system, and the mounting holes on the upper die base and the lower die base and the column hole on the lower die base are processed using the positioning coordinates; S4: Entering the mass production stage, heat treatment is performed on the split concave die, the split convex die and the blank holder according to the process specification; S5: Remove the guide plug plate, assemble the mold, assemble the split die, the split punch and the pressure ring to the upper mold base and the lower mold base through the mounting hole, and install the upper mold base and the lower mold base on the upper table and the lower table respectively.

8. The mold structure according to claim 7 that takes into account both development, mass production and mold base versatility, characterized in that: During the mold assembly process, the assembly error caused by heat treatment deformation is taken into consideration, and a thin pad is provided under the split concave mold, the split convex mold and the blank holder to eliminate the assembly error.

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