Cylindrical workpiece forming die, forming method and cylindrical workpiece

Abstract

The invention relates to the technical field of workpiece mold forming, in particular to a cylindrical workpiece forming mold, a forming method and a cylindrical workpiece, the cylindrical workpiece forming mold comprises a first mold base, a second mold base, an inner forming mechanism, an outer forming mechanism, an outer wedge and an inner wedge structure; the inner forming mechanism comprises at least one inner forming block arranged in a sliding and limiting mode in the radial direction and a guide hole formed in the axial direction and at least extending to the end of the inner forming block. The outer forming mechanism comprises at least one outer forming block arranged in a sliding and limiting mode in the radial direction. A first gap allowing a workpiece to be placed and formed is formed between the outer forming mechanism and the inner forming mechanism, and at least one outer forming block and one inner forming block are correspondingly arranged in the radial direction. The cylindrical workpiece forming die provided by the invention can be used for continuously forming a cylindrical workpiece with a plurality of negative angles, so that not only can the forming efficiency and the forming quality be improved, but also the forming processing cost can be reduced.

Description

Technical Field

[0001] The invention relates to the technical field of workpiece mold forming, and in particular to a cylindrical workpiece forming mold, a forming method and a cylindrical workpiece. Background Art

[0002] In the design and manufacturing process of cylindrical workpieces, due to specific uses and design requirements, it is often necessary to form structures with negative angles in the middle and / or ends of the sleeve. These negative angle structures can not only optimize the function of the product, but also play a key role such as limiting.

[0003] However, when the cylindrical workpiece has multiple negative angle structures distributed along the axial direction, the conventional one-step forming method is often no longer applicable due to the existence of negative angles. In this case, two or more forming processes are usually required, and positioning operations are performed multiple times, which not only increases the processing cost, but may also lead to large error accumulation, making quality control more difficult. Summary of the invention

[0004] In view of the above shortcomings of the prior art, the object of the present invention is to provide a molding die, a molding method and a cylindrical workpiece. The cylindrical workpiece molding die can continuously mold cylindrical workpieces with multiple negative angles, which can not only improve the molding efficiency and molding quality, but also reduce the molding processing cost.

[0005] To achieve the above-mentioned purpose and other related purposes, the present invention provides a cylindrical workpiece forming die, comprising:

[0006] The first mold base;

[0007] A second mold base, arranged to be molded together with the first mold base along a first direction;

[0008] An inner forming mechanism is arranged on the second mold base, the inner forming mechanism is columnar and comprises at least one inner forming block arranged for sliding and limiting in a radial direction and a guide hole arranged in an axial direction and extending at least to an end of the inner forming block;

[0009] The outer molding mechanism is in the shape of a cylinder and is sleeved outside the inner molding mechanism, and the outer molding mechanism includes at least one outer molding block which is slidingly limited in a radial direction;

[0010] An outer wedge connected to the first die base and configured to move along the first direction with the first die base to drive the outer forming block to move toward the workpiece in a radial direction;

[0011] an inner wedge structure configured to enter the guide hole in a first direction to drive the inner forming block to move in a radial direction toward the workpiece;

[0012] There is a first gap between the outer forming mechanism and the inner forming mechanism for placing and forming the workpiece, and there is at least one outer forming block corresponding to the inner forming block in the radial direction.

[0013] In one embodiment of the present invention, the outer inclined wedge drives at least one of the outer forming blocks to press the first outer side surface of the workpiece in the radial direction, while the inner inclined wedge structure drives at least one of the inner forming blocks to press the first inner side surface of the workpiece in the radial direction;

[0014] The outer forming block and the inner forming block are arranged opposite to each other in the radial direction, and the first outer side surface and the first inner side surface of the workpiece are inner and outer sides of the same position of the workpiece.

[0015] In one embodiment of the present invention, a positioning structure is provided between the inner molding mechanism and the outer molding mechanism at one end close to the second mold base;

[0016] The first die base is provided with a material pressing mechanism, and the material pressing mechanism is configured to be able to move along a first direction to make the workpiece contact with the positioning structure.

[0017] In one embodiment of the present invention, the outer inclined wedge is a stepped progressive inclined wedge arranged along the first direction;

[0018] The inner inclined wedge structure is a two-stage structure along the first direction and / or a stepped progressive inclined wedge arranged along the first direction.

[0019] In one embodiment of the present invention, the inner inclined wedge structure includes a first inner inclined wedge and / or a second inner inclined wedge;

[0020] The first mold base is provided with a first telescopic driving member along a first direction, and the first inner inclined wedge is connected to the first mold base through the first telescopic driving member;

[0021] The second mold base is provided with a second telescopic driving member along the first direction, and the second inner inclined wedge is connected to the second mold base through the second telescopic driving member.

[0022] In one embodiment of the present invention, a first resetting member is provided on the outer molding mechanism, and the outer molding block is connected to the outer molding mechanism via the first resetting member;

[0023] And / or a second resetting member is provided on the inner molding mechanism, and the inner molding block is connected to the inner molding mechanism via the second resetting member.

[0024] In one embodiment of the present invention, the cylindrical workpiece forming die further includes a stripping mechanism, and the stripping mechanism includes:

[0025] A material ejection assembly, one end of which abuts against an end of the workpiece close to the second die base along a first direction;

[0026] A third telescopic driving member is arranged on the second mold base along the first direction, and the third telescopic driving member is drivingly connected to the ejecting assembly.

[0027] To achieve the above-mentioned object and other related objects, the present invention provides a molding method, which is applied to the cylindrical workpiece molding die according to any one of claims 1 to 7, and the method comprises the following steps:

[0028] S1: Obtain a cylindrical blank;

[0029] S2: placing the sleeve blank in a first gap between the inner forming mechanism and the outer forming mechanism and positioning it;

[0030] S3: starting the cylindrical workpiece forming die to close the first die base and the second die base;

[0031] At least one of the inner forming blocks and one of the outer forming blocks are arranged opposite to each other in the radial direction, and cooperate with each other on both sides of the same position of the workpiece to form a structure with a negative draft angle;

[0032] S4: After the workpiece is formed, the first die base, the second die base, the outer wedge and the inner wedge structure are reset, and the formed workpiece is taken out.

[0033] In one embodiment of the present invention, the step of starting the cylindrical workpiece forming mold to close the first mold base and the second mold base comprises:

[0034] S31: the outer inclined wedge moves along the first direction and sequentially drives a plurality of outer forming blocks to extrude the outer surface of the workpiece, while the inner inclined wedge moves along the first direction and sequentially drives a plurality of inner forming blocks to extrude the inner surface of the workpiece;

[0035] S32: The outer forming block and the inner forming block located in the middle of the workpiece form a first forming portion in the middle of the workpiece along the radial direction;

[0036] S33: the outer forming block and the inner forming block located on the upper part of the workpiece form a group of second forming parts having a negative draft angle in the radial direction on the upper part of the workpiece;

[0037] S34: The outer forming block and the inner forming block located at the lower part of the workpiece form another group of third forming parts having a negative draft angle in the radial direction at the lower part of the workpiece.

[0038] To achieve the above-mentioned object and other related objects, the present invention provides a cylindrical workpiece, comprising:

[0039] Sleeve body;

[0040] At least one end of the sleeve body is integrally protruded with at least one bent portion along the axial direction, and the bent portion has a negative angle along the axial direction of the sleeve body;

[0041] And / or a first molding structure is integrally formed between the two ends of the sleeve body, and the first molding structure includes a concave structure and / or a convex structure.

[0042] In summary, the present invention has the following technical effects: In terms of improving production efficiency: the inner molding mechanism and the outer molding mechanism of the present invention realize continuous molding of multiple positions of the cylindrical workpiece through the mold closing process of the first mold base and the second mold base, avoiding the cumbersome steps of multiple pick-up and placement of the workpiece in the traditional single molding mold, thereby improving production efficiency. In terms of reducing manufacturing costs: since the inner molding mechanism and the outer molding mechanism of the present invention can complete the molding operations of multiple positions in one mold closing process, the number and complexity of the molds are reduced, thereby reducing the manufacturing cost. In terms of reducing positioning errors: the inner molding mechanism and the outer molding mechanism of the present invention avoid errors in multiple positioning processes by limiting the position of the cylindrical workpiece, thereby improving the quality stability of the product. In terms of adapting to special structures: the inner molding mechanism and the outer molding mechanism of the present invention can realize the molding of cylindrical workpieces with negative angles through the driving of the inner inclined wedge structure and the outer inclined wedge, thereby solving the difficulties of the prior art in dealing with such special structures. In summary, compared with the prior art, the present invention has higher production efficiency, lower manufacturing cost, higher product quality stability and better adaptability, and has higher practical value. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0044] Figure 1 It is a schematic structural diagram of one side of a cylindrical workpiece in one embodiment of the present invention;

[0045] Figure 2 It is a schematic diagram of the structure of the other side of the cylindrical workpiece in one embodiment of the present invention;

[0046] Figure 3 It is a structural schematic diagram of one side of a cylindrical workpiece forming die in one embodiment of the present invention;

[0047] Figure 4 It is a schematic structural diagram of the other side of the cylindrical workpiece forming die in one embodiment of the present invention;

[0048] Figure 5 It is a cross-sectional view of the structure of a cylindrical workpiece forming mold in one embodiment of the present invention;

[0049] Figure 6 A schematic diagram of a three-dimensional structure of an outer inclined wedge in one embodiment of the present invention;

[0050] Figure 7 Schematic diagram of the three-dimensional structure of the first inner inclined wedge in one embodiment of the present invention;

[0051] Figure 8 Schematic diagram of the three-dimensional structure of the second inner inclined wedge in one embodiment of the present invention;

[0052] Fig. 9 It is a structural schematic diagram of an outer forming mechanism in one embodiment of the present invention;

[0053] Fig.10 is a schematic structural diagram of an inner molding mechanism in one embodiment of the present invention;

[0054] Fig.11 A schematic diagram of the first mold base structure in one embodiment of the present invention;

[0055] Fig.12 Schematic diagram of the first inner wedge connection in one embodiment of the present invention;

[0056] Fig.13 A schematic diagram of a workpiece located on a lower die base structure in an embodiment of the present invention;

[0057] Fig.14 It is a schematic structural diagram of an outer forming block in an outer forming mechanism in one embodiment of the present invention;

[0058] Fig.15 It is a schematic diagram of the structure of the second inner wedge on the lower die seat in one embodiment of the present invention;

[0059] Fig.16 It is a schematic diagram of the structure of a stripping mechanism in one embodiment of the present invention;

[0060] Fig.17 It is a schematic diagram of the overall structure of workpiece positioning in one embodiment of the present invention;

[0061] Fig.18 A schematic diagram of a detailed structure of workpiece positioning in one embodiment of the present invention;

[0062] Fig.19 It is a schematic diagram of the structure of the lower pad in one embodiment of the present invention;

[0063] Fig. 20 It is a structural schematic diagram of the lower push cylinder in one embodiment of the present invention being pushed up to a designated position;

[0064] Fig.21 A structural state diagram of a first forming portion of a cylindrical workpiece forming die for forming a workpiece in one embodiment of the present invention;

[0065] Fig. 22 It is a schematic structural diagram of a first forming portion formed from a cylindrical blank in one embodiment of the present invention;

[0066] Fig.23 A structural state diagram of a second forming portion of a cylindrical workpiece forming die forming a workpiece in one embodiment of the present invention;

[0067] Fig.24 It is a schematic structural diagram of forming a second forming portion from a cylindrical blank in one embodiment of the present invention;

[0068] Fig.25 It is a structural state diagram of the third forming part of the cylindrical workpiece forming die in one embodiment of the present invention;

[0069] Fig.26 It is a schematic structural diagram of a third forming portion formed from a cylindrical blank in one embodiment of the present invention;

[0070] Component number description: workpiece 10, sleeve body 1011, bending portion 1012, first molding structure 1013, notch 1014, first die base 1, pressing mechanism 11, pressing pin 111, first spring 112, nitrogen spring fixing plate 12, upper die pad 13, upper die base 14, nitrogen spring 15, upper inner wedge pad 16, upper inner wedge fixing plate 17, second die base 2, lower die base 21, lower inner wedge fixing plate 22, connecting plate 23, connecting bolt 24, inner molding mechanism 3, inner molding block 31, second reset member 32, inner die body 33, guide hole 331, outer molding mechanism 4, outer molding block 41, limit groove structure 411, first reset member 42, outer mold body 43, outlet outer slider fixing plate 431, pressure block 4311, limit block 4312, limit pin 4313, inlet outer slider fixing plate 432, anti-lateral force assembly 433, anti-lateral force insert 4331, anti-lateral force fixing plate 4332, anti-lateral force block clamp 4333, outer inclined wedge 5, inner inclined wedge structure 6, first inner inclined wedge 61, first telescopic drive member 611, second inner inclined wedge 62, second telescopic drive member 621, positioning structure 7, lower pad 71, positioning block 72, stripping mechanism 8, ejecting assembly 80, ejecting block insert 81, ejecting block 82, ejecting block pad 83, second mold foot 84, third telescopic drive member 85. DETAILED DESCRIPTION

[0071] The following is an explanation of the embodiments of the present invention by specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the features in the following embodiments and the embodiments can be combined with each other without conflict. It should also be understood that the terms used in the embodiments of the present invention are intended to describe specific embodiments, rather than to limit the scope of protection of the present invention. The test methods for which specific conditions are not specified in the following examples are usually carried out under conventional conditions or according to the conditions recommended by the manufacturers.

[0072] See also Figures 1 to 26 . It should be noted that the structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the limiting conditions for the implementation of the present invention, so they have no substantial technical significance. Any modification of the structure, change in the proportional relationship, or adjustment of the size, without affecting the effects and purposes that can be achieved by the present invention, should still fall within the scope of the technical content disclosed by the present invention. At the same time, the terms such as "upper", "lower", "left", "right", "middle" and "one" quoted in this specification are only for the convenience of description, and are not used to limit the scope of the implementation of the present invention. Changes or adjustments in their relative relationships should also be regarded as the scope of the implementation of the present invention without substantially changing the technical content.

[0073] When numerical ranges are given in the embodiments, it should be understood that, unless otherwise specified in the present invention, both endpoints of each numerical range and any value between the two endpoints can be selected. Unless otherwise defined, all technical and scientific terms used in the present invention are familiar to those skilled in the art and the description of the present invention, and any methods, equipment and materials of the prior art similar or equivalent to the methods, equipment and materials described in the embodiments of the present invention can also be used to implement the present invention.

[0074] like Figure 1-10 As shown, the present invention provides a cylindrical workpiece forming die, comprising a first die base 1, a second die base 2, an inner forming mechanism 3, an outer forming mechanism 4, an outer inclined wedge 5 and an inner inclined wedge structure 6.

[0075] The second mold base 2 is molded with the first mold base 1 along the first direction; the inner molding mechanism 3 is arranged on the second mold base 2, the inner molding mechanism 3 is columnar, and includes at least one inner molding block 31 slidingly limited in the radial direction and a guide hole 331 arranged in the axial direction and extending at least to the end of the inner molding block 31; the outer molding mechanism 4 is cylindrical and sleeved outside the inner molding mechanism 3, the outer molding mechanism 4 includes at least one outer molding block 41 slidingly limited in the radial direction; the outer inclined wedge 5 is connected to the first mold base 1, and the outer inclined wedge 5 is configured to follow the first mold base 1 to move in the first direction and drive the outer molding block 41 to move in the radial direction toward the workpiece 10; the inner inclined wedge structure 6 is configured to enter the guide hole 331 along the first direction to drive the inner molding block 31 to move in the radial direction toward the workpiece 10;

[0076] There is a first gap between the outer molding mechanism 4 and the inner molding mechanism 3 for placing and molding the workpiece 10 , and there is at least one outer molding block 41 corresponding to the inner molding block 31 in the radial direction.

[0077] It should be noted that the cylindrical workpiece forming mold is generally placed vertically, that is, the first direction is the vertical direction. Of course, it can also be placed in other directions according to actual needs; the inner forming mechanism 3 is cylindrical or rod-shaped or columnar with a guide hole 331 along the first direction, and the guide hole 331 is a through hole or a blind hole. One or more outer forming blocks 41 are provided, and the outer forming blocks 41 are slidably set in the outer forming mechanism 4, and are also limited on the outer forming mechanism 4 to avoid excessive movement during forming; one or more inner forming blocks 31 are also provided, and the inner forming blocks 31 are slidably set in the inner forming mechanism 3, and are also limited on the inner forming mechanism 3 to avoid excessive movement during forming; the outer ring of the radial cross section of the outer forming mechanism 4 is polygonal, so as to facilitate the setting of other structures to fix the outer forming mechanism 4; the guide hole 331 is aligned with the inner inclined wedge structure 6 along the first direction, and the inner inclined wedge structure 6 is slidably set on the first mold base 1 or slidably set on the second mold base 2, or an inner inclined wedge structure 6 is provided on both the first mold base 1 and the second mold base 2. The outer forming block 41 and the inner forming block 31 are arranged correspondingly in the radial direction, which means that the outer forming block 41 and the inner forming block 31 are in a straight line in the radial direction, and can cooperate to extrude the inner and outer sides of the same position of the cylindrical workpiece at the same time. The inner forming block 31 is matched with the end close to the corresponding outer forming block 41 to jointly form the first forming part, the second forming part or the third forming part of the cylindrical workpiece. At the same time, in this case, it is not necessary for each inner forming block 31 and the outer forming block 41 to correspond one by one. When molding of a certain position of the cylindrical workpiece is required, the inner forming block 31 and the outer forming block 41 at that position need to be arranged one by one.

[0078] In the present case, the cylindrical workpiece is limited by the inner forming mechanism 3 and the outer forming mechanism 4. During the closing process of the first mold base 1 and the second mold base 2, the outer forming mechanism 4 is driven to move by the outer inclined wedge 5, and the inner forming block 31 is driven to move by the inner inclined wedge structure 6. Through the mutual cooperation of multiple groups of inner forming blocks 31 and outer forming blocks 41 along the first direction, continuous forming of multiple positions of the cylindrical workpiece is achieved, and at least a special structure with a negative draft angle can be formed, thereby reducing the number of processes, reducing manufacturing costs, reducing multiple positioning errors and improving product quality, and having high practical value.

[0079] like Figure 5 As shown in 21 or 23 or 25, as an optional embodiment of the present invention, the outer inclined wedge 5 drives at least one of the outer forming blocks 41 to press the first outer side surface of the workpiece 10 in the radial direction, while the inner inclined wedge structure 6 drives at least one of the inner forming blocks 31 to press the first inner side surface of the workpiece 10 in the radial direction;

[0080] The outer forming block 41 and the inner forming block 31 are arranged opposite to each other in the radial direction, and the first outer side surface and the first inner side surface of the workpiece 10 are inner and outer sides of the same position of the workpiece 10 .

[0081] It should be noted that, during the working process of the cylindrical workpiece forming mold, since it is necessary to form a structure with a negative angle at the first position of the workpiece 10, the outer side of the first position of the workpiece 10 is the first outer side surface, and the inner side of the first position of the workpiece 10 is the first inner side surface. Therefore, through the synergistic effect of the outer wedge 5 and the inner wedge structure 6, the relative arrangement of the inner forming block 31 and the outer forming block 41, it is possible to apply pressure on the inner and outer sides of the same position of the workpiece 10, so as to accurately form the required negative angle structure, thereby ensuring the accuracy and consistency of the negative angle structure. And because the inner forming block 31 and the outer forming block 41 are relatively arranged in the radial direction, they can uniformly apply pressure to the workpiece 10, which helps to reduce the deformation and stress concentration of the workpiece 10 during the forming process, thereby improving the forming quality, and the precise forming process and high-quality forming results can reduce the scrap rate, save material costs, and improve the overall production efficiency. It should be understood that when the workpiece 10 has multiple negative angle structures, the outer forming blocks 41 and the inner forming blocks 31 can be correspondingly arranged in multiple groups in the radial direction.

[0082] like Fig.17 , Fig.18 and Fig.19 As shown, as an optional embodiment of the present invention, a positioning structure 7 is provided between the inner molding mechanism 3 and the outer molding mechanism 4 at one end close to the second mold base 2;

[0083] The first die base 1 is provided with a material pressing mechanism 11 , and the material pressing mechanism 11 is configured to be able to move along a first direction to make the workpiece 10 contact the positioning structure 7 .

[0084] It should be noted that, since the workpiece 10 needs to be formed multiple times, in this case, a positioning structure 7 is provided between the inner forming mechanism 3 and the outer forming mechanism 4 near one end of the second die base 2, so that the workpiece 10 uses the same positioning structure 7 in multiple process steps, thereby reducing the error caused by multiple positioning, thereby improving the molding quality of the workpiece 10. At the same time, due to the setting of the pressing mechanism 11, the workpiece 10 can be accurately located at the positioning structure 7, thereby improving the accuracy of positioning, thereby improving the molding quality of the workpiece 10.

[0085] like Figure 11-12 As shown, as an optional embodiment of the present invention, the pressing mechanism 11 includes a pressing pin 111 and a first spring 112. The pressing pin 111 is pre-pressed by the first spring 112 to prevent the cylindrical workpiece from being out of place; when the first die base 1 and the second die base 2 are close to each other, the pressing mechanism 11 will move with the first die base 1 and press toward one end of the workpiece 10, so that the other end of the workpiece 10 moves to contact the positioning structure 7, so as to achieve accurate positioning of the workpiece 10.

[0086] like Figure 5-8 As shown, as an optional embodiment of the present invention, the outer wedge 5 is a stepped progressive wedge arranged along the first direction; the inner wedge structure 6 is a two-stage structure along the first direction and / or a stepped progressive wedge arranged along the first direction.

[0087] It should be noted that, since the cylindrical workpiece forming mold in this case is a progressive mold, the outer wedge 5 is arranged on the first mold base 1 and moves along the first direction with the first mold base 1; and the inner wedge structure 6 can be set to one section or two sections as needed. When the inner wedge structure 6 is set to one section, it can be set to the first mold base 1 or the second mold base 2 according to actual needs. When the inner wedge structure 6 is set to two sections, one section is set to the first mold base 1 and the other section is set to the second mold base 2. The inner wedge structure 6 with a two-section structure, at least one section of the structure can be a stepped progressive wedge. The stepped progressive wedge and the two-section inner wedge structure 6 can more accurately control the forming process of the workpiece 10 at different stages. By gradually advancing, it can be ensured that the shape and size of each stage meet the design requirements, thereby improving the accuracy of the final product. The design of the progressive mold of this case allows multiple molding steps to be completed in the same mold, reducing the number and time of mold replacement. The design of the stepped progressive wedge and the two-stage inner wedge structure 6 makes the transition between each step smoother and more efficient, thereby improving the overall production efficiency; due to the reduced number of mold replacements and improved production efficiency, the mold of this case can reduce production costs. At the same time, the design of the stepped progressive wedge and the two-stage inner wedge structure 6 can enhance the stability of the mold. For example, during the molding process, these structures can provide better support and guidance, reducing the risk of deformation of the workpiece 10.

[0088] like Figure 5 , 7 As shown in FIG. 8 , as an optional embodiment of the present invention, the inner inclined wedge structure 6 includes a first inner inclined wedge 61 and / or a second inner inclined wedge 62;

[0089] The first mold base 1 is provided with a first telescopic driving member 611 along a first direction, and the first inner inclined wedge 61 is connected to the first mold base 1 through the first telescopic driving member 611;

[0090] The second mold base 2 is provided with a second telescopic driving member 621 along the first direction, and the second inner inclined wedge 62 is connected to the second mold base 2 via the second telescopic driving member 621 .

[0091] It should be noted that, when the first mold base 1 and the second mold base 2 are closed, the first inner bevel wedge 61 and / or the second inner bevel wedge 62 still need subsequent driving to move. Therefore, the first inner bevel wedge 61 is driven to move by the first telescopic driving member 611, and the second inner bevel wedge 62 is driven to move by the second telescopic driving member 621. The first telescopic driving member 611 and the second telescopic driving member 621 can be a nitrogen spring 15 or an electric telescopic rod, a hydraulic telescopic rod, a pneumatic telescopic rod, etc., which can be selected according to actual needs.

[0092] like Figure 9-10As shown, as an optional embodiment of the present invention, a first restoring member 42 is provided on the outer molding mechanism 4, and the outer molding block 41 is connected to the outer molding mechanism 4 through the first restoring member 42;

[0093] And / or a second restoring member 32 is provided on the inner molding mechanism 3 , and the inner molding block 31 is connected to the inner molding mechanism 3 via the second restoring member 32 .

[0094] It should be noted that the first reset member 42 and / or the second reset member 32 are elements such as springs or elastic telescopic rods or electric telescopic rods. The first reset member 42 and the second reset member 32 are provided to facilitate the smooth reset of the corresponding outer forming block 41 and the inner forming block 31, so as to facilitate the next forming process, thereby improving the forming efficiency and reducing the cost of the forming process of the workpiece 10.

[0095] like Fig.16 As shown, as an optional embodiment of the present invention, the cylindrical workpiece forming mold also includes a stripping mechanism 8, and the stripping mechanism 8 includes a lifting assembly 80 and a third telescopic driving member 85; one end of the lifting assembly 80 abuts against an end of the workpiece 10 close to the second mold base 2 along a first direction; the third telescopic driving member 85 is arranged on the second mold base 2 along the first direction, and the third telescopic driving member 85 is drivingly connected to the lifting assembly 80.

[0096] It should be noted that, after the workpiece 10 is formed, the first die base 1 and the second die base 2 are separated, and the third telescopic driving member 85 drives the ejecting assembly 80 to lift the formed workpiece 10 along the first direction, thereby realizing automatic demoulding, which is beneficial to improving the efficiency of the forming process of the workpiece 10. It should be understood that the third telescopic driving member 85 can be provided with one or more, and the third telescopic driving member 85 is a cylinder or a hydraulic cylinder.

[0097] like Fig.16 As shown, as an optional embodiment of the present invention, the ejector assembly 80 includes an ejector block insert 81, an ejector block 82, an ejector block backing plate 83 and / or a second mold foot 84;

[0098] The ejection block insert 81 is tightly inserted into the ejection block 82, and the ejection block 82 and the ejection block pad 83 are fastened with bolts; the ejection block pad 83 and the third telescopic drive member 85 are fastened with bolts; the third telescopic drive member 85 and the second mold foot 84 are fastened with bolts. The entire stripping action process is controlled by a special program, and the piston of the third telescopic drive member 85 is pushed out to realize the stripping action, and retracted to realize resetting.

[0099] like Figure 21-26 As shown, the present invention provides a molding method, which is applied to the cylindrical workpiece molding die, and the method comprises the following steps:

[0100] S1: Obtain a cylindrical blank;

[0101] S2: placing the sleeve blank in the first gap between the inner forming mechanism 3 and the outer forming mechanism 4 and positioning it;

[0102] S3: starting the cylindrical workpiece forming mold to close the first mold base 1 and the second mold base 2;

[0103] At least one of the inner forming blocks 31 and the outer forming block 41 are arranged opposite to each other in the radial direction, and cooperate with each other on both sides of the same position of the workpiece 10 to form a structure with a negative draft angle;

[0104] S4: After the workpiece 10 is formed, the first die base 1, the second die base 2, the outer wedge 5 and the inner wedge structure 6 are reset, and the formed workpiece 10 is taken out.

[0105] It should be understood that the cylindrical blank described in this case can be a cylindrical workpiece with a bottom, a cylindrical workpiece without a bottom, or a cylindrical workpiece with a flange at the end, as long as it can be a workpiece 10 that can be formed by the cylindrical workpiece forming mold of this case.

[0106] like Figure 21-26 As shown, as an optional embodiment of the present invention, the step of starting the cylindrical workpiece forming mold to close the first mold base 1 and the second mold base 2 includes:

[0107] S31: the outer wedge 5 moves along the first direction and sequentially drives the plurality of outer forming blocks 41 to extrude the outer surface of the workpiece 10, while the inner wedge structure 6 moves along the first direction and sequentially drives the plurality of inner forming blocks 31 to extrude the inner surface of the workpiece 10;

[0108] S32: The outer forming block 41 and the inner forming block 31 located in the middle of the workpiece 10 form a first forming portion in the radial direction in the middle of the workpiece 10;

[0109] S33: the outer molding block 41 and the inner molding block 31 located on the upper part of the workpiece 10 form a group of the second molding parts having a negative draft angle in the radial direction on the upper part of the workpiece 10;

[0110] S34: The outer molding block 41 and the inner molding block 31 located at the lower part of the workpiece 10 form another group of the third molding parts having a negative draft angle in the radial direction at the lower part of the workpiece 10.

[0111] It should be noted that the first molding portion and / or the third molding portion may be a bending portion 1012 having a negative angle along the axial direction of the sleeve body 1011, and the first molding portion and / or the second molding portion and / or the third molding portion may be a first molding structure 1013, and the first molding structure 1013 includes a concave shape structure and / or a convex shape structure.

[0112] like Figure 1-2 As shown, the present invention provides a cylindrical workpiece, comprising a sleeve body 1011, wherein at least one end of the sleeve body 1011 is integrally protruded with at least one bending portion 1012 along the axial direction, and the bending portion 1012 has a negative angle along the axial direction of the sleeve body 1011;

[0113] And / or a first molding structure 1013 is integrally formed between the two ends of the sleeve body 1011, and the first molding structure 1013 includes a concave structure and / or a convex structure.

[0114] Furthermore, a protrusion is integrally formed between the two ends of the sleeve body 1011 .

[0115] Furthermore, the sleeve body 1011 also includes a first hole disposed on the circumferential side wall.

[0116] Furthermore, one, two or more bending portions 1012 are provided along at least one end of the sleeve body 1011 .

[0117] Furthermore, both ends of the sleeve body 1011 are provided with bending portions 1012 .

[0118] Furthermore, a notch 1014 is provided at one end of the sleeve body 1011 .

[0119] It should be noted that the sleeve body 1011 has a negative draft angle, and cannot be formed by a general stamping die, and must be formed using a special molding die. Since the draft direction of the sleeve body 1011 after molding is generally the axial direction, that is, the aforementioned first direction, and the negative angle refers to the bending portion 1012 protruding or recessed in the radial direction, it will hinder the sleeve body 1011 from being taken out of the mold along the first direction. The concave structure and the convex structure are in the radial direction toward the sleeve body 1011. It should be understood that the concave structure and the convex structure in the radial direction do not necessarily have to be perpendicular to the axial direction, and a certain deviation is allowed. The cylindrical workpiece can use these bending portions 1012 or the first molding structure 1013 to limit other structures inside it, thereby improving the convenience of assembly.

[0120] Further, such as Fig.10As shown, the inner molding mechanism 3 includes an inner mold body 33, which can be arranged in an integral manner or fixedly connected by multiple components through welding or fastener connection; the inner mold body 33 includes a first slide groove for sliding connection of the inner molding block 31.

[0121] Further, such as Fig.10 As shown, the guide hole 331 is a through hole or a blind hole extending from one or both ends of the inner forming block 31 along the middle of the axial direction of the inner forming block 31 .

[0122] Further, such as Fig. 9 As shown, the outer molding mechanism 4 includes an outer mold body 43, which can be arranged in an integral manner or fixedly connected by multiple components through welding or fastener connection; the outer mold body 43 includes a second slide groove for sliding connection of the outer molding block 41.

[0123] Further, such as Figure 6 As shown, the outer inclined wedge 5 includes a first outer inclined surface, a second outer inclined surface, a third outer inclined surface and a fourth outer inclined surface which are arranged in a stepped manner and progressively, the fourth inner inclined surface is arranged closest to the second mold base 2, and when a plurality of outer inclined wedges 5 are arranged along the circumferential direction of the first mold base 1, the distance between the two fourth inner inclined surfaces along the radial direction is greater than the distance between the two third inner inclined surfaces along the radial direction, greater than the distance between the two second inner inclined surfaces along the radial direction, greater than the distance between the two first inner inclined surfaces along the radial direction.

[0124] Further, such as Figure 7 As shown, the first inner inclined wedge 61 includes a first inner inclined surface and a second inner inclined surface which are arranged in steps and are progressive in sequence, and the first inner inclined surface is close to an end of the first inner inclined wedge 61 close to the second mold base 2;

[0125] Further, such as Figure 8 As shown, the second inner inclined wedge 62 includes an inclined surface structure, and the first inner inclined wedge 61 and the second inner inclined wedge 62 are both rod-shaped or bar-shaped.

[0126] Further, such as Fig.10 As shown, the inner forming block 31 includes a first inner forming block, a second inner forming block and a third inner forming block; Fig. 9 As shown, the outer forming block 41 includes a first outer forming block corresponding to the first inner forming block, a second outer forming block corresponding to the second inner forming block, and a third outer forming block corresponding to the second inner forming block.

[0127] Further, such as Fig. 9 As shown, the upper portion of the first outer molding block is limited to the outer mold body 43 by the pressing block 4311.

[0128] Furthermore, the second outer molding block cooperates with the second inner molding block to stamp and mold the middle portion of the cylindrical workpiece, for example, stamping and molding the first molding structure 1013 .

[0129] As an optional embodiment of this case, Figure 11-12 As shown, the first die base 1 includes a nitrogen spring fixing plate 12, an upper die pad 13, an upper die base 14, a nitrogen spring 15, an inner guide column, a discharge bolt, an upper inner inclined wedge pad 16, an upper inner inclined wedge fixing plate 17 and a first inner inclined wedge 61; the nitrogen spring fixing plate 12, the upper die pad 13 and the upper die base 14 are fastened by bolts, the nitrogen spring 15 is fastened to the nitrogen spring fixing plate 12 by bolts, the inner guide column is fixed to the upper inner inclined wedge pad 17, the first inner inclined wedge 61 is fixed to the upper inner inclined wedge fixing plate 17, and is fixed to the upper inner inclined wedge pad 17 by bolt connection, the discharge bolt is fixed to the upper inner inclined wedge pad 16 and is suspended on the upper die base 14, and the whole is pre-pressed by the nitrogen spring 15.

[0130] As an optional embodiment of this case, Fig.13 As shown, the outer mold body 43 of the outer molding mechanism 4 includes an outlet outer slider fixing plate 431 and an inlet outer slider fixing plate 432. The inlet outer slider fixing plate 432 is fastened to the lower mold base 21 with bolts, and the outlet outer slider fixing plate 431 is padded on the inlet outer slider fixing plate 432 and fastened to the lower mold base 21 with bolts.

[0131] As an optional embodiment of this case, Fig.13 As shown, the outer mold body 43 of the outer molding mechanism 4 also includes an anti-lateral force component 433 fixed to the lower mold base 21, and the anti-lateral force component 433 includes an anti-lateral force insert 4331, an anti-lateral force fixing plate 4332, an anti-lateral force block clamp 4333 and a clamp pad. The anti-lateral force fixing plate 4332 is fixed to the lower mold base 21 with bolts, the anti-lateral force block clamp 4333 is connected to the clamp pad with bolts and fixed to the lower mold base 21, the anti-lateral force insert 4331 is located in the anti-lateral force fixing plate 4332 and is fastened to the lower mold base 21 with bolts, and the anti-lateral force insert 4331 is inserted into the anti-lateral force fixing plate 4332 and is fastened to the lower mold base 21 with bolts, thereby improving the structural stability of the outer molding mechanism 4.

[0132] As an optional embodiment of this case, Fig. 9 and Fig.14 As shown, regarding the installation of the first outer molding block, the outer mold body 43 includes an outlet outer slider fixing plate 431, which is installed in the blind hole of the outlet outer slider fixing plate 431 through a spring, the first outer molding block is inserted into the slide groove of the outlet outer slider fixing plate 431 and limited by the unloading bolt, the pressing block 4311 is fixed on the outlet outer slider fixing plate 431, and the first outer molding block is reset by a spring.

[0133] As an optional embodiment of this case, Fig. 9 and Fig.14 As shown, regarding the installation of the second outer forming block, it is installed into the blind hole of the outlet outer slider fixing plate 431 through a spring, the second outer forming block is inserted into the slide groove of the outlet outer slider fixing plate 431, the limit block 4312 is fixed on the outlet outer slider fixing plate 431 to limit and fix the spring, and the second outer forming block is reset by the spring.

[0134] As an optional embodiment of this case, Fig. 9 and Fig.14 As shown, regarding the installation of the third outer molding block, the outer mold body 43 includes an inlet outer slider fixing plate 432, a spring is installed in the blind hole of the inlet outer slider fixing plate 432, the third outer molding block is inserted into the slide groove of the outlet outer slider fixing plate 431 and is limited by a unloading bolt or a limiting pin 4313, one end of the limiting pin 4313 is connected to the inlet outer slider fixing plate 432, a limiting groove structure 411 is provided in the third outer molding block, and the other end of the limiting pin 4313 extends into the limiting groove structure 411, thereby realizing the limitation of the third outer molding block, and the third outer molding block is reset by the spring.

[0135] As an optional embodiment of this case, Fig.15 As shown, the second die base 2 includes a lower die base 21, a lower inner wedge fixing plate 22, a connecting plate 23 and connecting bolts 24;

[0136] The second inner inclined wedge 62, the lower inner inclined wedge fixing plate 22, and the connecting plate 23 are connected and fastened with bolts, and the connecting plate 23 is suspended on the lower die base 21 with a discharge bolt; the connecting bolt 24 is inserted into the slide groove of the connecting plate 23 and fastened to the end of the second telescopic driving member 621, such as being fastened to the lower push rod of the press equipment, and the driving of the second telescopic driving member 621 can be controlled by the equipment program, such as Fig. 20 As shown, when the second telescopic driving member 621 pushes up the lower inner inclined wedge fixing plate 22 and the distance H from the lower mold base 21 is 3-5mm, the sensor will give a signal to stop the second telescopic driving member 621 from working, so that the second telescopic driving member 621 is pushed up to the specified position, that is, the second inner inclined wedge 62 reaches the specified position.

[0137] Further, such as Figure 17-Figure 19As shown, the positioning structure 7 includes a lower pad 71 and a positioning block 72, the lower pad 71 is arranged between the inner mold body 33 and the lower mold base 21 and is fastened by bolts; at least part of the structure of the end of the cylindrical workpiece is in contact with the upper end surface of the lower pad 71 when it is placed in the first gap between the outer molding mechanism 4 and the inner molding mechanism 3, that is, the end of the cylindrical workpiece is positioned by the lower pad 71; the positioning block 72 is arranged on a side of the lower pad 71 close to the inner mold body 33, and the end of the cylindrical workpiece is positioned by the positioning block 72. Since the lower end of the cylindrical workpiece is provided with a notch 1014, the notch 1014 of the cylindrical workpiece is limited by the positioning block 72 to prevent the cylindrical workpiece from circumferential rotation. The accurate positioning of the cylindrical workpiece during molding is achieved by positioning in two directions, which is beneficial to improving product quality.

[0138] like Figure 21-26 As shown, the working process of the cylindrical workpiece forming die in this case is:

[0139] obtaining a cylindrical blank;

[0140] The sleeve blank is placed on the positioning structure 7 between the first gap between the inner forming mechanism 3 and the outer forming mechanism 4, for example, the notch 1014 of the cylindrical workpiece is aligned and positioned with the corresponding positioning block 72;

[0141] Then, the cylindrical workpiece forming die is started to close the first die base 1 and the second die base 2;

[0142] When the first inner inclined wedge 61 moves along the guide hole 331 to the end of the second inner forming block and drives the second inner forming block to move radially toward the middle of the cylindrical workpiece, the outer inclined wedge 5 drives the second outer forming block to move radially toward the corresponding second inner forming block and forms a first forming portion in the middle of the cylindrical workpiece;

[0143] As the first die base 1 and the second die base 2 continue to close the mold, the first inner bevel wedge 61 continues to move into the guide hole 331, and the outer bevel wedge 5 continues to move along the first direction. The first inner bevel wedge 61 and the outer bevel wedge 5 cooperate to maintain the positions of the second inner forming block and the second outer forming block. The first inner bevel wedge 61 drives the first inner forming block to move, and the outer bevel wedge 5 drives the first outer forming block to move toward the corresponding first inner forming block, thereby realizing the second forming portion of the cylindrical workpiece.

[0144] As the first die base 1 and the second die base 2 continue to close the mold, the second inner inclined wedge 62 located at the other end of the inner molding mechanism 3 continues to move into the guide hole 331, and the outer inclined wedge 5 continues to move along the first direction, and the first inner inclined wedge 61 and the outer inclined wedge 5 cooperate to maintain the position of the second inner molding block and the second outer molding block, while maintaining the position of the first inner molding block and the first outer molding block, and the second inner inclined wedge 62 drives the third inner molding block to move, and the outer inclined wedge 5 drives the third outer molding block to move toward the corresponding third inner molding block, thereby realizing the molding of the third molding part of the cylindrical workpiece.

[0145] After the workpiece 10 is formed, the first die base 1 and the second die base 2 move away from each other, the outer inclined wedge 5 and the inner inclined wedge structure 6 are automatically reset, and the cylindrical workpiece is automatically demoulded under the action of the stripping mechanism 8 .

[0146] In summary, the cylindrical workpiece forming mold of the present invention can complete the continuous forming operation of multiple positions through a one-time mold closing process, which greatly improves the production efficiency, reduces the manufacturing cost, reduces the multiple positioning errors, and improves the product quality. Therefore, it has broad application prospects in the manufacturing industry that needs to mass-produce cylindrical workpieces, such as automobile manufacturing, aerospace, etc. Secondly, the cylindrical workpiece forming mold of the present invention can process some cylindrical workpieces with special structures by designing a complex mold structure, such as a cylindrical workpiece with a negative draft angle. Therefore, it has broad application prospects in the manufacturing industry that needs to process cylindrical workpieces with special structures, such as precision machinery manufacturing, medical equipment manufacturing, etc. Finally, the cylindrical workpiece forming mold of the present invention can adapt to workpieces 10 of different specifications and shapes through an adjustable structure. Therefore, it has broad application prospects in the manufacturing industry that needs to process cylindrical workpieces of various specifications and shapes, such as home appliance manufacturing, furniture manufacturing, etc.

[0147] In summary, the present invention effectively overcomes some practical problems in the prior art and thus has high utilization value and use significance.

[0148] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the art may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by a person of ordinary skill in the art without departing from the spirit and technical concept disclosed by the present invention shall still be covered by the claims of the present invention.

Claims

1. A cylindrical workpiece forming die, characterized in that: include: The first mold base; A second mold base, arranged to be molded together with the first mold base along a first direction; An inner forming mechanism is arranged on the second mold base, the inner forming mechanism is columnar and comprises at least one inner forming block arranged for sliding and limiting in a radial direction and a guide hole arranged in an axial direction and extending at least to an end of the inner forming block; The outer molding mechanism is in the shape of a cylinder and is sleeved outside the inner molding mechanism, and the outer molding mechanism includes at least one outer molding block which is slidingly limited in a radial direction; An outer wedge connected to the first die base and configured to move along the first direction with the first die base to drive the outer forming block to move toward the workpiece in a radial direction; an inner wedge structure configured to enter the guide hole in a first direction to drive the inner forming block to move in a radial direction toward the workpiece; There is a first gap between the outer forming mechanism and the inner forming mechanism for placing and forming the workpiece, and there is at least one outer forming block corresponding to the inner forming block in the radial direction.

2. The cylindrical workpiece forming die according to claim 1, characterized in that: The outer inclined wedge drives at least one of the outer forming blocks to press the first outer side surface of the workpiece in the radial direction, while the inner inclined wedge structure drives at least one of the inner forming blocks to press the first inner side surface of the workpiece in the radial direction; The outer forming block and the inner forming block are arranged opposite to each other in the radial direction, and the first outer side surface and the first inner side surface of the workpiece are inner and outer sides of the same position of the workpiece.

3. The cylindrical workpiece forming die according to claim 1, characterized in that: A positioning structure is provided between the inner molding mechanism and the outer molding mechanism at one end close to the second mold base; The first die base is provided with a material pressing mechanism, and the material pressing mechanism is configured to be able to move along a first direction to make the workpiece contact with the positioning structure.

4. The cylindrical workpiece forming die according to claim 1, characterized in that: The outer wedge is a stepped progressive wedge arranged along the first direction; The inner inclined wedge structure is a two-stage structure along the first direction and / or a stepped progressive inclined wedge arranged along the first direction.

5. The cylindrical workpiece forming die according to claim 4, characterized in that: The inner inclined wedge structure includes a first inner inclined wedge and / or a second inner inclined wedge; The first mold base is provided with a first telescopic driving member along a first direction, and the first inner inclined wedge is connected to the first mold base through the first telescopic driving member; The second mold base is provided with a second telescopic driving member along the first direction, and the second inner inclined wedge is connected to the second mold base through the second telescopic driving member.

6. The cylindrical workpiece forming die according to claim 1, characterized in that: The outer forming mechanism is provided with a first resetting member, and the outer forming block is connected to the outer forming mechanism via the first resetting member; And / or a second resetting member is provided on the inner molding mechanism, and the inner molding block is connected to the inner molding mechanism via the second resetting member.

7. The cylindrical workpiece forming die according to claim 1, characterized in that: It also includes a stripping mechanism, which includes: A material ejection assembly, one end of which abuts against an end of the workpiece close to the second die base along a first direction; A third telescopic driving member is arranged on the second mold base along the first direction, and the third telescopic driving member is drivingly connected to the ejecting assembly.

8. A molding method, characterized in that: Applied to the cylindrical workpiece forming die according to any one of claims 1 to 7, the method comprises the following steps: S1: Obtain a cylindrical blank; S2: placing the sleeve blank in a first gap between the inner forming mechanism and the outer forming mechanism and positioning it; S3: starting the cylindrical workpiece forming die to close the first die base and the second die base; At least one of the inner forming blocks and one of the outer forming blocks are arranged opposite to each other in the radial direction, and cooperate with each other on both sides of the same position of the workpiece to form a structure with a negative draft angle; S4: After the workpiece is formed, the first die base, the second die base, the outer wedge and the inner wedge structure are reset, and the formed workpiece is taken out.

9. The molding method according to claim 8, characterized in that: The step of starting the cylindrical workpiece forming mold and closing the first mold base with the second mold base comprises: S31: the outer inclined wedge moves along the first direction and sequentially drives a plurality of outer forming blocks to extrude the outer surface of the workpiece, while the inner inclined wedge moves along the first direction and sequentially drives a plurality of inner forming blocks to extrude the inner surface of the workpiece; S32: The outer forming block and the inner forming block located in the middle of the workpiece form a first forming portion in the middle of the workpiece along the radial direction; S33: the outer forming block and the inner forming block located on the upper part of the workpiece form a group of second forming parts having a negative draft angle in the radial direction on the upper part of the workpiece; S34: The outer forming block and the inner forming block located at the lower part of the workpiece form another group of third forming parts having a negative draft angle in the radial direction at the lower part of the workpiece.

10. A cylindrical workpiece, characterized in that: include: Sleeve body; At least one end of the sleeve body is integrally protruded with at least one bent portion along the axial direction, and the bent portion has a negative angle along the axial direction of the sleeve body; And / or a first molding structure is integrally formed between the two ends of the sleeve body, and the first molding structure includes a concave structure and / or a convex structure.

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