Combined die of closed pipe fitting and preparation method

Abstract

The invention discloses a combined die of a closed pipe fitting and a preparation method. The combined die at least comprises but not limited to an arch-shaped upper die and a movable upper die. A matching part matched with the power part is arranged at the top of the arch-shaped upper die, one end of the arch-shaped upper die is hinged to the movable upper die, and the other end of the arch-shaped upper die is fixedly connected with the movable upper die; by means of the scheme, the problems that a traditional splicing forming process method is long in machining procedure, low in production efficiency and low in one-time inspection qualification rate can be solved; the comprehensive problems that a traditional mold is long in manufacturing period, poor in universality, high in cost, uneconomical, large in occupied space and the like can be solved. On the premise that a large number of press dies do not need to be input, the problems of multiple varieties, fast production change, small quantity and the like in a multi-variety and fast-pace production mode are solved more economically and effectively through fast and accurate die manufacturing and combined installation and use, the production and manufacturing capacity is greatly improved, and the production requirement is met.

Description

Technical Field

[0001] The invention relates to the field of pipe fitting preparation, and in particular to a combined mould and a preparation method for a closed pipe fitting. Background Art

[0002] In the process of locomotive manufacturing, a large number of closed pipe fittings of different specifications need to be processed. The traditional knife die cannot complete the processing of closed pipe fittings. Therefore, the commonly used process methods are: one is splicing molding. For the preparation of cylindrical pipe fittings, the steps are as follows: the pre-processed closed pipe fittings are first split into 1 / 2 sheet metal parts, and then bent into a semi-circular arc shape by multiple bending at a small angle. After the two semi-circular arcs are butt-jointed, spot welding is first performed and then welding is completed. Two molding and adjustment operators, one spot welding operator, and one CO2 welding operator are required. The processing process is: cutting - bending and forming - sample inspection - adjustment - spot welding - welding. It takes an average of 1207S to complete the processing of one product. For the preparation of square and rectangular pipe fittings, the steps are as follows: the pre-processed square and rectangular pipe fittings are first split into 1 / 2 sheet metal parts, and then bent into a U-shape by multiple bending. After the two U shapes are butt-jointed, spot welding is performed and then welding is completed. It requires 1 molding and adjustment operator, 1 spot welding operator, and 1 CO2 welding operator. The processing process is: cutting - bending molding - sample inspection - spot welding - welding - adjustment. It takes an average of 665 seconds to complete the processing of one product. The main advantage is: no mold is required. The main disadvantages are: many processing steps, low production efficiency, and the main quality problems are distortion, misalignment, size tolerance, and multiple creases on the arc with poor appearance. The average first inspection pass rate is <70%.

[0003] The other is that a large number of press molds need to be made to complete the molding of products of different specifications.

[0004] For the preparation of cylindrical pipe fittings, the average investment in a set of molds is 20,000 yuan / set, and the mold production cycle is 21 days / set;

[0005] For the preparation of square and rectangular pipe fittings, the average investment in a set of molds is 30,000-50,000 yuan / set, and the mold production cycle is 21 days / set.

[0006] Because the mold of the press machine is large and very heavy, it needs to be operated with an overhead crane. The average mold trial time for the first piece is 2 hours. It requires 2 molding and adjustment operators and 1 overhead crane operator. The processing process is: unloading - hanging the mold on the stage - first piece test film - bending molding - sample inspection - adjustment - hanging the mold off the stage. It takes an average of 175 seconds to complete the processing of a product. The main advantages are: the product can be processed and formed in one time, the product quality is stable, and the average one-time inspection pass rate is 95.3%. The main disadvantages are: the press mold is not versatile, usually one mold can only produce one product, and the main quality problems are strain and distortion. In addition, in the fast-paced production mode of multiple varieties, the products change quickly and the quantity is small. The investment in molds not only has a long manufacturing cycle, high cost, not only is it uneconomical, but also occupies production space, and cannot meet production needs in time. Comprehensive problems such as.

[0007] How to solve it effectively is a key issue. Summary of the invention

[0008] The purpose of the present invention is to provide a combined mold and a preparation method for a closed type pipe fitting in view of the above-mentioned shortcomings, so as to solve the problems of multiple processing steps, low production efficiency, low preparation efficiency and high cost for closed type pipe fittings in the prior art.

[0009] The present invention is achieved through the following scheme:

[0010] A combined mold for a closed pipe fitting includes at least but not limited to an arched upper mold and a movable upper mold; the top of the arched upper mold is provided with a matching part that matches with a power part, one end of the arched upper mold is hinged to the movable upper mold, and the other end is fixedly connected to the movable upper mold.

[0011] Based on the structure of the combined mold of the above-mentioned closed pipe fitting, the bow-shaped upper mold includes a connecting beam, a first support column and a second support column. The first support column and the second support column are respectively arranged perpendicular to the connecting beam. The first support column, the connecting beam and the second support column are connected end to end to form a bow structure.

[0012] Based on the structure of the combined mold of the above-mentioned closed pipe fitting, a T-shaped connecting portion is arranged on the end surface of the connecting crossbeam away from the first support column and the second support column; the T-shaped connecting portion cooperates with the T-slot on the power unit, a connecting ear is arranged on the end surface of the first support column away from the second support column, a locking hole is arranged on the connecting ear, and a first supporting ear and a second supporting ear are arranged on the end surface of the second support column away from the first support column; the first supporting ear and the second supporting ear are arranged at a predetermined distance.

[0013] Based on the structure of the combined mold of the above-mentioned closed pipe fitting, the movable upper mold includes a connecting plate, a plug-in ear and a contact rod; the connecting plate and the plug-in ear are respectively arranged on both sides of the contact rod, the plug-in ear is arranged between the first supporting ear and the second supporting ear, and is connected as a whole through a pin shaft, and a connecting hole matching the locking hole is provided in the connecting plate, and the connecting plate and the connecting ear are locked by nuts and bolts.

[0014] Based on the structure of the combined mold of the above-mentioned closed pipe fitting, the contact rod includes a rectangular body and an arc-shaped body; the rectangular body and the arc-shaped body are integrally formed, and the end of the rectangular body is connected to the connecting plate.

[0015] The present solution provides another combination mold for closed-type pipe fittings, which at least includes but is not limited to an arched upper mold, a movable upper mold, an upper mold sheet group and a lower mold sheet group; the top of the arched upper mold is provided with a matching portion that matches with the power portion, one end of the arched upper mold is hinged with the movable upper mold, and the other end is fixedly connected with the movable upper mold; the upper mold sheet group is provided with a matching hole that matches with the movable upper mold, and the lower mold sheet group is arranged under the upper mold composed of the arched upper mold, the upper mold sheet group and the movable upper mold, and the cross-sectional contour of the upper mold sheet group is adapted to the cross-sectional contour of the lower mold sheet group.

[0016] Based on the structure of the combined mold of the above-mentioned closed pipe fitting, the arched upper mold includes a connecting crossbeam, a first support column and a second support column, the first support column and the second support column are respectively arranged perpendicular to the connecting crossbeam, and the first support column, the connecting crossbeam and the second support column are connected end to end to form an arched structure; a T-shaped connecting part is arranged on the end face of the connecting crossbeam away from the first support column and the second support column; the T-shaped connecting part cooperates with the T-shaped slot on the power part, and a connecting ear is arranged on the end face of the first support column away from the second support column, and a locking hole is arranged on the connecting ear, and a locking hole is arranged on the end face of the second support column away from the second support column. A first supporting ear and a second supporting ear are arranged on the end surface away from the first supporting column; the first supporting ear and the second supporting ear are arranged at a predetermined distance; the movable upper mold includes a connecting plate, a plug-in ear and a contact rod; the connecting plate and the plug-in ear are respectively arranged at two sides of the contact rod, the plug-in ear is arranged between the first supporting ear and the second supporting ear, and are connected as a whole through a pin shaft, and a connecting hole matching the locking hole is arranged in the connecting plate, and the connecting plate and the connecting ear are locked by nuts and bolts; the contact rod includes a rectangular body and an arc body; the rectangular body and the arc body are integrally formed, and the end of the rectangular body is connected to the connecting plate.

[0017] Based on the structure of the combined mold of the above-mentioned closed pipe fitting, the upper mold piece group is composed of a plurality of upper mold pieces, the matching hole is arranged at the center position of the upper mold piece, a central locking hole is arranged on the upper mold piece, and a screw is passed through the central locking holes of the plurality of upper mold pieces to lock them as a whole, the cross-sectional profile of the matching hole is adapted to the cross-sectional profile of the contact rod, and the outer contour of the upper mold piece is an arc-shaped structure; the lower mold piece group is composed of a plurality of lower mold pieces, an arc-shaped groove structure adapted to the arc-shaped structure of the upper mold piece is arranged on the lower mold piece, and side locking holes are also arranged at the bottom of the lower mold piece, the side locking holes are symmetrically arranged along the center position of the lower mold piece, and a screw is passed through the side locking holes of the plurality of upper mold pieces to lock them as a whole.

[0018] This solution provides a method for preparing a closed pipe fitting, comprising the following steps:

[0019] S1, mold preparation:

[0020] S11, assemble the upper die block, connect the right side of the bow-shaped upper die to the movable upper die with a pin, and fix the left side with a threaded connection;

[0021] S12, inserting the assembled upper module into the T-slot of the equipment through the T-shaped portion of the bow-shaped upper die;

[0022] S13, check whether the dovetail groove on the equipment is abnormal;

[0023] S2, forming operation:

[0024] S21, placing the pipe plate to be processed at the pressure center of the equipment;

[0025] S22, bending is performed 4 times to complete one-step forming;

[0026] S3, take out the product:

[0027] After a square rectangular pipe is processed and formed, first remove the bolt connection between the bow-shaped upper die and the left side of the movable upper die, rotate the movable upper die, take out the processed product, and then proceed to process the next product with the same operation steps.

[0028] This solution provides another method for preparing a closed pipe fitting, comprising the following steps:

[0029] S1, mold preparation:

[0030] S11, assemble the upper die, install several upper die pieces into the movable upper die in sequence as required; insert the screw into the hole of the upper die piece from the left side and tighten it with a nut; connect the bow-shaped upper die and the movable upper die on the right side with a pin shaft and on the left side with a bolt;

[0031] S12, assembling the lower mold, using two screws to pass through the two holes of the lower mold pieces respectively, and tightening them with nuts respectively to complete the assembly;

[0032] S13, inserting the T-shaped part of the bow-shaped upper mold into the T-shaped slot of the equipment and placing it at the pressure center of the equipment, thus completing the connection between the mold and the equipment;

[0033] S14, placing the assembled lower module in the limit groove of the equipment working platform;

[0034] S2, forming operation:

[0035] S21, placing the plate to be processed at the pressure center of the equipment;

[0036] S22, according to the specifications of the pipe to be processed, 3-4 times of extrusion are performed to complete the molding;

[0037] S3, take out the product:

[0038] After a cylindrical pipe fitting product is formed, first remove the bolt connection between the bow-shaped upper die and the left side of the movable upper die, rotate the movable upper die, take out the processed pipe fitting product, and then proceed to process the next product with the same operation steps.

[0039] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0040] 1. Through this solution, firstly, the problems of long processing steps, low production efficiency and low one-time inspection pass rate in traditional splicing molding process methods can be solved; secondly, the comprehensive problems of long production cycle, poor versatility, high cost, uneconomical and occupied space of traditional molds can be solved. Without the need to invest in a large number of press molds, by quickly and accurately manufacturing molds and combining them for installation and use, it can more economically and effectively solve the problems of many varieties, fast production changes and small quantities in the multi-variety and fast-paced production mode, greatly improving the production and manufacturing capabilities and meeting production needs.

[0041] 2. The bow-shaped upper die of the mold is designed with a T-shaped structure, which enables the upper die part to be quickly connected and replaced with the T-slot on the equipment.

[0042] 3. A hollow space is formed between the bow-shaped upper die and the movable upper die, and the two can be rotated and disassembled.

[0043] 4. The lower part of the movable upper die is designed with a convex small R arc, which can be used with the dovetail groove on the bending equipment to complete the bending and forming of square and rectangular pipe fittings. It is also suitable for other bending and forming processes such as deep U-shaped products.

[0044] 5. The upper mold piece used in this mold is convex, and the lower mold piece is concave. It has a simple structure and reasonable design. It can make full use of the scraps and process the upper and lower mold pieces through laser equipment to achieve fast and accurate mold making. It can be used in combination according to the needs of product molding and processing.

[0045] 6. When processing cylindrical pipe fittings. According to the needs, several upper molds are assembled together through the movable upper mold, and then connected to the bow-shaped upper mold through pins and bolts, and then quickly connected to the T-slot on the equipment through the T-shaped structure on the upper part of the bow-shaped upper mold, so that the pressure of the equipment is evenly applied to the sheet metal to be processed and formed, avoiding the problem of pressure concentration. The mold has strong versatility and is very suitable for the conversion of small batch and fast-paced production modes. Compared with traditional molds, it greatly reduces the cost and time of mold manufacturing, greatly shortens the mold trial time, does not require a crane to hoist the mold, and is safe, simple and economical to operate. It can be quickly and effectively implemented, greatly improving production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] Figure 1 This is a schematic diagram of the overall main structure of Example 1 of the present invention;

[0047] Figure 2 It is a schematic side view of the overall structure of Example 1 of the present invention;

[0048] Figure 3 This is a schematic diagram of the overall main structure of Example 2 of the present invention;

[0049] Figure 4 It is a schematic side view of the overall structure of Example 2 of the present invention;

[0050] Figure 5 It is a schematic diagram of the overall top view of the structure of Example 2 of the present invention;

[0051] Figure 6 It is a schematic diagram of the structure of the upper mold piece in Example 2 of the present invention;

[0052] Figure 7 It is a schematic diagram of the structure of the lower mold piece in Example 2 of the present invention;

[0053] Figure 8 It is a structural schematic diagram of the combination of the movable upper mold and the upper mold piece assembly in Example 2 of the present invention;

[0054] Fig. 9 It is a schematic diagram of the structure of the contact rod in Example 2 of the present invention;

[0055] Markings in the figure: 1. bow-shaped upper mold; 2. movable upper mold; 3. upper mold piece group; 4. lower mold piece group; 11. connecting beam; 12. first support column; 13. second support column; 14. T-shaped connecting part; 15. connecting ear; 16. locking hole; 17. first support ear; 18. second support ear; 21. connecting plate; 22. plug-in ear; 23. contact rod; 24. rectangular body; 25. arc-shaped body; 31. matching hole; 32. upper mold piece; 33. center locking hole; 41. lower mold piece; 42. side locking hole. DETAILED DESCRIPTION

[0056] All features disclosed in this specification, or steps in all methods or processes disclosed, except mutually exclusive features and / or steps, can be combined in any manner.

[0057] Any feature disclosed in this specification (including any additional claims and abstract), unless otherwise stated, may be replaced by other equivalent or alternative features having similar purposes. That is, unless otherwise stated, each feature is only an example of a series of equivalent or similar features.

[0058] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by the terms "up", "down", "left", "right", etc. are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a predetermined direction, be constructed and operated in a predetermined direction, and therefore cannot be understood as a limitation on the present invention.

[0059] In addition, the terms "first", "second", etc. are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first", "second", etc. may explicitly or implicitly include one or more of the features.

[0060] Example 1

[0061] like Figure 1 and Figure 2 As shown, the present invention provides a technical solution:

[0062] A combined mold for a closed pipe fitting includes at least but not limited to an arched upper mold 1 and a movable upper mold 2; a mating portion for mating with a power portion is provided on the top of the arched upper mold 1, one end of the arched upper mold 1 is hinged to the movable upper mold 2, and the other end is fixedly connected to the movable upper mold 2.

[0063] Based on the above structure, this scheme is mainly used for preparing square rectangular pipe fittings. When in use, the matching part and the power part are fixed together, and the bow-shaped upper mold 1 and the movable upper mold 2 are driven by the power part to move. The pipe fitting plate to be pressed is placed on a workbench with a dovetail groove, and the movable upper mold 2 is driven by the power part to cooperate with the dovetail groove to press the pipe fitting plate to form a closed rectangular tube. Since the movable upper mold 2 is detachably connected to the bow-shaped upper mold 1, the pressed pipe fitting can be quickly taken out.

[0064] As an example, the arched upper mold 1 may include a connecting beam 11, a first support column 12 and a second support column 13, the first support column 12 and the second support column 13 are respectively arranged perpendicular to the connecting beam 11, and the first support column 12, the connecting beam 11 and the second support column 13 are connected end to end to form an arched structure;

[0065] A T-shaped connecting portion 14 is arranged on the end face of the connecting crossbeam 11 away from the first supporting column 12 and the second supporting column 13; the T-shaped connecting portion 14 cooperates with the T-shaped slot on the power unit, a connecting ear 15 is arranged on the end face of the first supporting column 12 away from the second supporting column 13, a locking hole 16 is arranged on the connecting ear 15, and a first supporting ear 17 and a second supporting ear 18 are arranged on the end face of the second supporting column 13 away from the first supporting column 12; the first supporting ear 17 and the second supporting ear 18 are arranged at a predetermined distance.

[0066] As an example, the movable upper mold 2 may include a connecting plate 21, a plug-in ear 22 and a contact rod 23; the connecting plate 21 and the plug-in ear 22 are respectively arranged on both sides of the contact rod 23, the plug-in ear 22 is arranged between the first supporting ear 17 and the second supporting ear 18, and are connected as a whole through a pin shaft, and a connecting hole matching the locking hole 16 is provided in the connecting plate 21, and the connecting plate 21 and the connecting ear 15 are locked by nuts and bolts.

[0067] Based on the above structure, the connecting ear 15 is provided to facilitate the cooperation with the movable upper mold 2 to complete the single-sided locking operation, and the first supporting ear 17 and the second supporting ear 18 are provided to form a hinge structure with one side of the movable upper mold 2 to realize the rotation of the movable upper mold 2, so that the pressed and formed pipe fittings can be quickly removed.

[0068] As an example, the contact rod 23 may include a rectangular body 24 and an arc-shaped body 25 ; the rectangular body 24 and the arc-shaped body 25 are integrally formed, and an end of the rectangular body 24 is connected to the connecting plate 21 .

[0069] Based on the above structure, by setting the arc body 25, when pressing square and rectangular pipes, the dovetail groove of the bending equipment can be used for bending and forming square and rectangular pipes. It is also suitable for bending and forming other products such as deep U-shaped products.

[0070] Example 2

[0071] like Figure 3 to Figure 9 As shown, the present invention provides a technical solution:

[0072] A combined mold for a closed pipe fitting, which at least includes but is not limited to an arched upper mold 1, a movable upper mold 2, an upper mold piece group 3 and a lower mold piece group 4; a matching portion that matches with a power portion is provided on the top of the arched upper mold 1, one end of the arched upper mold 1 is hinged with the movable upper mold 2, and the other end is fixedly connected with the movable upper mold 2; the upper mold piece group 3 is provided with a matching hole 31 that matches with the movable upper mold 2, and the lower mold piece group 4 is arranged under an upper mold composed of the arched upper mold 1, the upper mold piece group 3 and the movable upper mold 2, and the cross-sectional contour of the upper mold piece group 3 is adapted to the cross-sectional contour of the lower mold piece group 4.

[0073] Based on the above structure, this scheme is mainly used for preparing cylindrical pipe fittings. When in use, the matching part and the power part are fixed together, the upper die set 3 is inserted into the movable upper die 2 through the matching hole 31, and the bow-shaped upper die 1 and the movable upper die 2 are driven by the power part to move. The pipe fitting sheet to be pressed is placed on the lower die set 4, and the lower die set 4 is fixed on the workbench. The upper die set 3 and the lower die set 4 are driven by the power part to press the pipe fitting sheet to form a closed cylindrical structure. Since the movable upper die 2 and the bow-shaped upper die 1 are detachably connected, the pressed pipe fitting can be quickly taken out.

[0074] As an example, the arched upper mold 1 may include a connecting beam 11, a first support column 12 and a second support column 13, the first support column 12 and the second support column 13 are respectively arranged perpendicular to the connecting beam 11, and the first support column 12, the connecting beam 11 and the second support column 13 are connected end to end to form an arched structure;

[0075] A T-shaped connecting portion 14 is arranged on the end face of the connecting crossbeam 11 away from the first supporting column 12 and the second supporting column 13; the T-shaped connecting portion 14 cooperates with the T-shaped slot on the power unit, a connecting ear 15 is arranged on the end face of the first supporting column 12 away from the second supporting column 13, a locking hole 16 is arranged on the connecting ear 15, and a first supporting ear 17 and a second supporting ear 18 are arranged on the end face of the second supporting column 13 away from the first supporting column 12; the first supporting ear 17 and the second supporting ear 18 are arranged at a predetermined distance.

[0076] As an example, the movable upper mold 2 may include a connecting plate 21, a plug-in ear 22 and a contact rod 23; the connecting plate 21 and the plug-in ear 22 are respectively arranged on both sides of the contact rod 23, the plug-in ear 22 is arranged between the first supporting ear 17 and the second supporting ear 18, and are connected as a whole through a pin shaft, and a connecting hole matching the locking hole 16 is provided in the connecting plate 21, and the connecting plate 21 and the connecting ear 15 are locked by nuts and bolts.

[0077] Based on the above structure, the connecting ear 15 is provided to facilitate the cooperation with the movable upper mold 2 to complete the single-sided locking operation, and the first supporting ear 17 and the second supporting ear 18 are provided to form a hinge structure with one side of the movable upper mold 2 to realize the rotation of the movable upper mold 2, so that the pressed and formed pipe fittings can be quickly removed.

[0078] As an example, the contact rod 23 may include a rectangular body 24 and an arc-shaped body 25 ; the rectangular body 24 and the arc-shaped body 25 are integrally formed, and an end of the rectangular body 24 is connected to the connecting plate 21 .

[0079] The upper mold piece group 3 is composed of a plurality of upper mold pieces 32, the matching hole 31 is arranged at the center position of the upper mold piece 32, a center locking hole 33 is arranged on the upper mold piece 32, and a screw is passed through the center locking holes 33 of the plurality of upper mold pieces 32 to lock them into one, the cross-sectional profile of the matching hole 31 is adapted to the cross-sectional profile of the contact rod 23, and the outer contour of the upper mold piece 32 can be an arc-shaped structure.

[0080] The lower mold assembly 4 is composed of multiple lower molds 41, and an arc groove structure that is compatible with the arc structure of the upper mold 32 is provided on the lower mold 41. A side locking hole 42 is also provided at the bottom of the lower mold 41. The side locking holes 42 are symmetrically arranged along the center position of the lower mold 41. The screw passes through the side locking holes 42 of multiple upper molds 32 to lock them into one.

[0081] Based on the above structure, by setting the cooperation to be compatible with the structure of the contact rod 23, on the one hand, the upper mold piece 32 can be more stably connected to the contact rod 23, and on the other hand, it can avoid the shaking of the upper mold piece 32 during the pressing process to affect the pressing effect. At the same time, the upper mold piece 32 is set to an arc structure, and the lower mold piece 41 is set to an arc groove structure, which can facilitate the pressing of cylindrical pipe fittings.

[0082] Example 3

[0083] Based on the above embodiment 1, the present invention provides a technical solution:

[0084] A method for preparing a closed pipe fitting comprises the following steps:

[0085] S1, mold preparation:

[0086] S11, assemble the upper die block, connect the right side of the bow-shaped upper die to the movable upper die with a pin, and fix the left side with a threaded connection;

[0087] S12, inserting the assembled upper module into the T-slot of the equipment through the T-shaped portion of the bow-shaped upper die.

[0088] S13, check whether there is any abnormality in the dovetail groove on the equipment.

[0089] S2, forming operation:

[0090] S21, placing the pipe plate to be processed at the pressure center of the equipment;

[0091] S22, one-step forming can be completed by bending in 4 times;

[0092] S3, take out the product:

[0093] After a square rectangular pipe is processed and formed, first remove the bolt connection between the bow-shaped upper die and the left side of the movable upper die, rotate the movable upper die, take out the processed product, and then proceed to process the next product with the same operation steps.

[0094] Example 4

[0095] Based on the above embodiment 2, the present invention provides a technical solution:

[0096] A method for preparing a closed pipe fitting comprises the following steps:

[0097] S1, mold preparation:

[0098] S11, assemble the upper die, install several upper die pieces into the movable upper die in sequence as required; insert the screw into the hole of the upper die piece from the left side and tighten it with a nut; connect the bow-shaped upper die and the movable upper die on the right side with a pin shaft and on the left side with a bolt;

[0099] S12, assembling the lower mold, using two screws to pass through the two holes of the lower mold pieces respectively, and tightening them with nuts respectively to complete the assembly;

[0100] S13, insert the T-shaped part of the bow-shaped upper mold into the T-shaped slot of the equipment and place it at the pressure center of the equipment, thus completing the connection between the mold and the equipment.

[0101] S14, placing the assembled lower module in the limit groove of the equipment working platform.

[0102] S2, forming operation:

[0103] S21, placing the plate to be processed at the pressure center of the equipment;

[0104] S22, according to the specifications of the pipe to be processed, 3-4 times of extrusion can complete the one-step forming;

[0105] S3, take out the product:

[0106] After a cylindrical pipe fitting product is formed, first remove the bolt connection between the bow-shaped upper die and the left side of the movable upper die, rotate the movable upper die, take out the processed pipe fitting product, and then proceed to process the next product with the same operation steps.

[0107] This solution is for the preparation of cylindrical pipe fittings. It can meet the bending and forming processing of sheet metal parts with a diameter of φ80-350mm, a length of ≤500mm, and a thickness of ≤12mm. According to the specifications of different closed pipe fittings, one-time forming can be completed in 3-4 times. Main advantages: only one forming operator is required, and no overhead crane operation is required. The processing process is: unloading-bending-sample inspection. It takes an average of only 45 seconds to complete the processing of a product. Compared with the splicing forming process method, the processing time of each product is shortened by an average of 1162 seconds, and the production efficiency is greatly improved. The average one-time inspection pass rate is 97.6%. The production efficiency is increased by an average of 3 times compared with the press mold forming, and the production efficiency is increased by an average of 26 times compared with the splicing forming process method.

[0108] This solution is for the preparation of square and rectangular pipe fittings. It can meet the bending and forming processing of sheet metal parts with a length of ≤500mm, a width of 40-260mm, and a thickness of ≤12mm. One-time forming can be completed by bending 4 times. The processing process is: cutting - bending and forming - sample inspection. It takes an average of only 85 seconds to complete the processing of a product. Compared with the splicing forming process method, the processing time of each product is shortened by an average of 560 seconds, and the production efficiency is greatly improved. The average one-time inspection pass rate is 98%. Main advantages: only one molding operator is required, and no overhead crane operation is required. It is simple and practical, easy to operate, low cost, and the production efficiency is an average of 3 times higher than that of press mold forming, and an average of 7.8 times higher than that of splicing forming process.

[0109] The effects of this design are:

[0110] The bow-shaped upper die of the mold is designed with a T-shaped structure, which enables the upper die part to be quickly connected and replaced with the T-slot on the equipment.

[0111] A hollow space is formed between the bow-shaped upper die and the movable upper die, and the two can be rotated and disassembled. This is the core to realize that the closed pipe fitting can be formed in one time and can be easily taken out from the upper die.

[0112] The lower part of the movable upper die is designed with a convex small R arc, which can be used with the dovetail groove on the bending equipment to complete the bending and forming of square and rectangular pipes. It is also suitable for other bending and forming processes such as deep U-shaped products.

[0113] The upper die piece used in this mold is convex, and the lower die piece is concave. It has a simple structure and reasonable design. It can make full use of the scraps and process the upper and lower die pieces through laser equipment to achieve fast and accurate mold making. It can be used in combination according to the needs of product molding and processing. This is the key to achieving the bending molding of closed cylindrical pipe fittings of different specifications.

[0114] When processing cylindrical pipe fittings. As needed, several upper mold pieces are assembled together through the movable upper mold, and then connected to the bow-shaped upper mold through pins and bolts, and then quickly connected to the T-slot on the equipment through the T-shaped structure on the upper part of the bow-shaped upper mold, so that the equipment pressure acts evenly on the sheet metal to be processed and formed, avoiding the problem of pressure concentration. The mold has strong versatility and is very suitable for the conversion of small batch and fast-paced production modes. Compared with traditional molds, it greatly reduces the cost and time of mold manufacturing, greatly shortens the mold trial time, does not require a crane to lift the mold, and is safe, simple and economical to operate. It can be quickly and effectively implemented, greatly improving production efficiency. The comparison between this universal combination mold and the splicing molding process method and the traditional press mold is shown in the following table:

[0115]

[0116]

[0117] The advantages and effects of this project are: easy to use, efficient, time-saving, labor-saving, and highly safe. The mold is simple to manufacture and has low manufacturing time and economic costs. The mold can be combined and recycled according to product needs. The design principles and ideas of the mold can be widely promoted in the machinery industry and have high promotion value.

[0118] (1) This invention is applicable to: the forming and processing of closed-type pipe fittings. a. Cylindrical pipe fittings. It can meet the bending and forming processing of sheet metal parts with a diameter of φ80-350mm, a length of ≤500mm, and a thickness of ≤12mm; b. Square and rectangular pipe fittings. It can meet the bending and forming processing of length ≤500mm, width 40-260mm, and thickness ≤12mm) and deep U-shaped products.

[0119] (2) The bow-shaped upper die of the mold is designed with a T-shaped structure, which enables the upper die part to be quickly connected and replaced with the T-slot on the equipment.

[0120] (3) A hollow space is formed between the bow-shaped upper die and the movable upper die, and the two can be rotated and disassembled. This is the core of realizing that the closed pipe fitting can be bent into shape and can be easily removed from the upper die.

[0121] (4) The lower part of the movable upper die is designed with a convex small R arc, which can be used for the bending and forming of square and rectangular pipes with the dovetail groove of the bending equipment. It is also suitable for the bending and forming of other deep U-shaped products.

[0122] (5) The upper and lower mold pieces used in the mold have simple structures and reasonable designs. The leftover materials are fully utilized to process the upper and lower mold pieces through laser equipment to achieve fast and accurate mold making. The upper and lower mold pieces can be quickly connected and combined by bolts according to the needs of product molding processing. This is the key to achieving the bending molding of cylindrical pipe fittings of different specifications.

[0123] (6) When processing cylindrical pipe fittings. As needed, several upper mold pieces are assembled together through the movable upper mold, and then connected to the bow-shaped upper mold through pins and bolts, and then quickly connected to the T-slot on the equipment through the T-shaped structure on the upper part of the bow-shaped upper mold, so that the equipment pressure acts evenly on the sheet metal to be processed and formed, avoiding the problem of pressure concentration. The mold has strong versatility and is very suitable for the conversion of small batch and fast-paced production modes. The design principle of this invention can be applied to the production of products such as closed plate type pipe fittings. The replicability of the design principle is a major feature of this invention.

[0124] 7) The mold can generally be made of 45# steel, which has high strength and wear resistance. It can not only meet the rigidity of the mold and not produce deformation, but also has good economy;

[0125] 8) The upper and lower mold pieces are cut by laser with an accuracy of Ra12.5um, which can ensure that there is no indentation or damage on the product surface. No machining or milling process is required, which greatly reduces the mold making cost and achieves low-cost and rapid mold making. Generally, 45# steel and better materials with high hardness and high wear resistance can be used.

[0126] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A combined mold for a closed pipe fitting, characterized in that: At least it includes but is not limited to a bow-shaped upper die and a movable upper die; the top of the bow-shaped upper die is provided with a matching part that matches with the power part, one end of the bow-shaped upper die is hinged to the movable upper die, and the other end is fixedly connected to the movable upper die.

2. A combined mold for a closed pipe fitting according to claim 1, characterized in that: The arched upper mold includes a connecting beam, a first supporting column and a second supporting column. The first supporting column and the second supporting column are respectively arranged perpendicular to the connecting beam. The first supporting column, the connecting beam and the second supporting column are connected end to end to form an arched structure.

3. A combined mold for a closed pipe fitting according to claim 2, characterized in that: A T-shaped connecting portion is provided on the end surface of the connecting crossbeam away from the first support column and the second support column; the T-shaped connecting portion cooperates with the T-slot on the power unit, a connecting ear is provided on the end surface of the first support column away from the second support column, a locking hole is provided on the connecting ear, and a first supporting ear and a second supporting ear are provided on the end surface of the second support column away from the first support column; the first supporting ear and the second supporting ear are arranged at a predetermined distance.

4. A combined mold for a closed pipe fitting according to claim 3, characterized in that: The movable upper mold includes a connecting plate, a plug-in ear and a contact rod; the connecting plate and the plug-in ear are respectively arranged on both sides of the contact rod, the plug-in ear is arranged between the first supporting ear and the second supporting ear, and is connected as a whole through a pin shaft, and a connecting hole matching the locking hole is provided in the connecting plate, and the connecting plate and the connecting ear are locked by nuts and bolts.

5. A combined mold for a closed pipe fitting according to claim 4, characterized in that: The contact rod comprises a rectangular body and an arc-shaped body; the rectangular body and the arc-shaped body are integrally formed, and the end of the rectangular body is connected to the connecting plate.

6. A combined mold for a closed pipe fitting, characterized in that: At least include but are not limited to an arched upper die, a movable upper die, an upper die sheet group and a lower die sheet group; the top of the arched upper die is provided with a matching portion that matches with the power portion, one end of the arched upper die is hinged with the movable upper die, and the other end is fixedly connected with the movable upper die; the upper die sheet group is provided with a matching hole that matches with the movable upper die, and the lower die sheet group is arranged under the upper die composed of the arched upper die, the upper die sheet group and the movable upper die, and the cross-sectional contour of the upper die sheet group is adapted to the cross-sectional contour of the lower die sheet group.

7. A combined mold for a closed pipe fitting according to claim 6, characterized in that: The arched upper mold comprises a connecting crossbeam, a first supporting column and a second supporting column, the first supporting column and the second supporting column are respectively arranged perpendicular to the connecting crossbeam, and the first supporting column, the connecting crossbeam and the second supporting column are connected end to end to form an arched structure; a T-shaped connecting portion is arranged on the end face of the connecting crossbeam away from the first supporting column and the second supporting column; the T-shaped connecting portion cooperates with the T-slot on the power part, a connecting ear is arranged on the end face of the first supporting column away from the second supporting column, a locking hole is arranged on the connecting ear, and a first supporting ear and a second supporting ear are arranged on the end face of the second supporting column away from the first supporting column; the first supporting ear and the second supporting ear are arranged at a predetermined distance; the movable upper mold comprises a connecting plate, a plug-in ear and a contact rod; the connecting plate and the plug-in ear are respectively arranged at two sides of the contact rod, the plug-in ear is arranged between the first supporting ear and the second supporting ear, and are connected as a whole through a pin shaft, a connecting hole cooperating with the locking hole is arranged in the connecting plate, and the connecting plate and the connecting ear are locked by a nut and a bolt; the contact rod comprises a rectangular body and an arc body; the rectangular body and the arc body are integrally formed, and the end of the rectangular body is connected to the connecting plate.

8. A combined mold for a closed pipe fitting according to claim 7, characterized in that: The upper mold piece group is composed of a plurality of upper mold pieces, the matching hole is arranged at the center position of the upper mold piece, a central locking hole is arranged on the upper mold piece, and a screw is passed through the central locking holes of the plurality of upper mold pieces to lock them into one, the cross-sectional profile of the matching hole is adapted to the cross-sectional profile of the contact rod, and the outer contour of the upper mold piece is an arc-shaped structure; the lower mold piece group is composed of a plurality of lower mold pieces, an arc-shaped groove structure adapted to the arc-shaped structure of the upper mold piece is arranged on the lower mold piece, and side locking holes are also arranged at the bottom of the lower mold piece, the side locking holes are symmetrically arranged along the center position of the lower mold piece, and a screw is passed through the side locking holes of the plurality of upper mold pieces to lock them into one.

9. A method for preparing a closed pipe fitting based on the combined mold according to any one of claims 1 to 5, characterized in that: The steps include: S1, mold preparation: S11, assemble the upper die block, connect the right side of the bow-shaped upper die to the movable upper die with a pin, and fix the left side with a threaded connection; S12, inserting the assembled upper module into the T-slot of the equipment through the T-shaped portion of the bow-shaped upper die; S13, check whether the dovetail groove on the equipment is abnormal; S2, forming operation: S21, placing the pipe plate to be processed at the pressure center of the equipment; S22, bending is performed 4 times to complete one-step forming; S3, take out the product: After a square rectangular pipe is processed and formed, first remove the bolt connection between the bow-shaped upper die and the left side of the movable upper die, rotate the movable upper die, take out the processed product, and then proceed to process the next product with the same operation steps.

10. A method for preparing a closed pipe fitting based on the combined mold according to any one of claims 6 to 8, characterized in that: The steps include: S1, mold preparation: S11, assemble the upper die, install several upper die pieces into the movable upper die in sequence as required; insert the screw into the hole of the upper die piece from the left side and tighten it with a nut; connect the bow-shaped upper die and the movable upper die on the right side with a pin shaft and on the left side with a bolt; S12, assembling the lower mold, using two screws to pass through the two holes of the lower mold pieces respectively, and tightening them with nuts respectively to complete the assembly; S13, inserting the T-shaped part of the bow-shaped upper mold into the T-shaped slot of the equipment and placing it at the pressure center of the equipment, thus completing the connection between the mold and the equipment; S14, placing the assembled lower module in the limit groove of the equipment working platform; S2, forming operation: S21, placing the plate to be processed at the pressure center of the equipment; S22, according to the specifications of the pipe to be processed, 3-4 times of extrusion are performed to complete the molding; S3, take out the product: After a cylindrical pipe fitting product is formed, first remove the bolt connection between the bow-shaped upper die and the left side of the movable upper die, rotate the movable upper die, take out the processed pipe fitting product, and then proceed to process the next product with the same operation steps.

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