Pipe fitting hump internal expansion forming die
By combining a split concave mold and a polyurethane columnar inner mold, the problem of the inability of existing rigid inner molds to form the hump of pipe fittings in one step is solved, and efficient production with hump dimensions meeting design requirements is achieved.
Patent Information
- Application Number
- CN202520878206.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-05-07
- Publication Date
- 2026-02-06
- Estimated Expiration
- 2035-05-07
AI Technical Summary
Existing rigid inner molds cannot form pipe fittings with small inner diameters but large hump design dimensions in one step, resulting in low production efficiency.
The combination of a split concave mold and a polyurethane columnar inner mold is used. The radial deformation of the polyurethane columnar inner mold during the mold closing process achieves a hump-shaped deformation, which is then formed in one step with the mold.
The camel hump size fully meets the design requirements, and the mold is formed in one piece, which significantly improves production efficiency. The mold is also convenient and reliable to use.
Smart Images
Figure CN223875925U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to pipe fitting forming frock technical field, concretely relates to a pipe fitting hump internal expansion forming die. BACKGROUND
[0002] When the pipe fitting inner diameter size is small, and the hump design size is big, the ordinary steel inner die strength is not enough, the hump size after forming cannot satisfy the design requirement, cannot realize one-time forming, and the production efficiency is low. UTILITY MODEL CONTENTS
[0003] The utility model discloses a pipe fitting hump internal expansion forming die, which is reasonable in structure and reliable in use, solves the problem that the existing steel inner die cannot form the pipe fitting hump once, and the hump size formed once fully meets the design requirement, thereby significantly improving the production efficiency.
[0004] The technical scheme of the utility model is:
[0005] A pipe fitting hump internal expansion forming die, which comprises an upper die plate, a lower die plate, a convex die arranged on the lower surface of the upper die plate, a concave die lower base plate arranged on the upper surface of the lower die plate, and a split concave die located above the concave die lower base plate, and the technical key points are as follows: the split concave die is composed of a left lobe concave die and a right lobe concave die, the inner walls of the left lobe concave die and the right lobe concave die are split to form a cylindrical part cavity corresponding to the pipe fitting, an annular expansion groove concentric with the cylindrical part cavity is arranged on the inner wall of the cylindrical part cavity, the cross section of the annular expansion groove is in the shape of a hump, the convex die is located directly above the cylindrical part cavity and has a polyurethane cylindrical inner die fixed to the lower end of the convex die, side limiting blocks are respectively fixed to the left and right sides of the concave die lower base plate, horizontal through holes are arranged in the side limiting blocks, and connecting rods are arranged in the horizontal through holes; the connecting rods are located on the opposite sides of the left lobe concave die and the right lobe concave die, the front ends of the connecting rods are connected to the left lobe concave die or the right lobe concave die, the rear sections of the connecting rods are sleeved with return springs, and the return springs are clamped between the rear ends of the connecting rods and the side limiting blocks; the lower surface of the upper die plate is provided with a left inclined iron for insertion between the side limiting block and the left lobe concave die and a right inclined iron for insertion between the side limiting block and the right lobe concave die.
[0006] The lower ends of the left inclined iron and the right inclined iron are provided with avoiding openings corresponding to the connecting rods to avoid interference with the connecting rods during downward movement.
[0007] The front and rear sides of the concave die lower base plate are respectively provided with sliding guide plates for clamping the left lobe concave die and the right lobe concave die.
[0008] The opposite upper ends of the left lobe concave die and the right lobe concave die are respectively provided with inclined guide surfaces matched with the left inclined iron or the right inclined iron.
[0009] The side limiting block is provided with a wear-resistant layer towards the left or right inclined iron side to reduce the wear amount and ensure the forming precision.
[0010] The upper surface edge of the lower die plate is symmetrically provided with a pair of guide columns, and the lower surface of the upper die plate is provided with a guide sleeve corresponding to the guide column.
[0011] The inner diameter of the cylindrical cavity formed by the left and right split body female dies is equal to the outer diameter of the pipe, the outer diameter of the male die is equal to the outer diameter of the pipe, and the outer diameter of the polyurethane columnar inner die is equal to the inner diameter of the pipe.
[0012] The utility model discloses the beneficial effect is:
[0013] 1, the process of closing the die polyurethane columnar inner die is subjected to the radial deformation of male die lower pressure (in the process of closing the die, the lower surface of male die and the upper end surface of pipe contact and exert pressure on pipe, and the polyurethane columnar inner die is subjected to the radial deformation of male die lower pressure), so that the pipe is deformed in the hump shape at the annular bulging groove of split type female die, and the polyurethane columnar inner die is used as a soft inner die to cooperate with the die closing process, realizes the one-time forming of pipe, solves the problem that the existing rigid inner die cannot form the hump of pipe once, and the size of the hump formed once fully meets the design requirement, and the production efficiency is significantly improved.
[0014] 2, when the die is opened, the polyurethane columnar inner die resets with the upper die plate and the male die, and the left and right split body female dies of split type female die restore to the separated state, so that the formed pipe product can be taken out conveniently and reliably. BRIEF DESCRIPTION OF DRAWINGS
[0015] Fig. 1 It is the structure diagram of the utility model;
[0016] Fig. 2 It is the sectional view of the utility model;
[0017] Fig. 3 It is the perspective view of the utility model.
[0018] In the drawing: 1. guide sleeve, 2. guide column, 3. side limiting block, 4. sliding guide plate, 5. side limiting block, 6. lower die plate, 7. connecting rod, 8. reset spring, 9. upper die plate, 10. right inclined iron, 11. male die, 12. right split body female die, 13. left split body female die, 14. left inclined iron, 15. polyurethane columnar inner die, 16. female die lower base plate, 17. wear-resistant layer, 18. annular bulging groove. DETAILED DESCRIPTION
[0019] The utility model is described in detail according to the drawings.
[0020] As Figs. 1-3 shown, the pipe hump internal expansion forming die comprises an upper die plate 9, a lower die plate 6, a male die 11 arranged on the lower surface of the upper die plate 9, a female die lower pad 16 arranged on the upper surface of the lower die plate 6, and a split female die located above the female die lower pad 16.
[0021] The split female die is composed of a left lobe female die 13 and a right lobe female die 12. The inner walls of the left lobe female die 13 and the right lobe female die 12 are split to form a cylindrical component cavity corresponding to the pipe. An annular bulging groove 18 concentric with the cylindrical component cavity is arranged on the inner wall of the cylindrical component cavity. The cross section of the annular bulging groove 18 is hump-shaped. The male die 11 is located directly above the cylindrical component cavity and has a polyurethane cylindrical inner die 15 fixed concentrically at the lower end thereof. The inner diameter of the cylindrical component cavity formed by the left lobe female die 13 and the right lobe female die 12 is equal to the outer diameter of the pipe, the outer diameter of the male die 11 is equal to the outer diameter of the pipe, and the outer diameter of the polyurethane cylindrical inner die 15 is equal to the inner diameter of the pipe.
[0022] The left and right sides of the female die lower pad 16 are respectively fixed with side limiting blocks 3 and 5. The side limiting blocks 3 and 5 are provided with horizontal through holes, and a connecting rod 7 is arranged in the horizontal through holes. The connecting rod 7 is located at the opposite sides of the left lobe female die 13 and the right lobe female die 12. The front end of the connecting rod 7 is connected with the left lobe female die 13 or the right lobe female die 12. The rear section of the connecting rod 7 is sleeved with a return spring 8, and the return spring 8 is clamped between the rear end of the connecting rod 7 and the corresponding side limiting block 3 or side limiting block 5.
[0023] The lower surface of the upper die plate 9 is provided with a left inclined iron 14 inserted between the side limiting block 3 and the left lobe female die 13, and a right inclined iron 10 inserted between the side limiting block 5 and the right lobe female die 12. In this embodiment, the lower ends of the left inclined iron 14 and the right inclined iron 10 are provided with avoidance openings corresponding to the connecting rod 7, so as to avoid interference with the connecting rod 7 during downward movement. The opposite upper ends of the left lobe female die 13 and the right lobe female die 12 are respectively provided with inclined guide surfaces matched with the left inclined iron 14 or the right inclined iron 10. In this embodiment, the side limiting blocks 3 and 5 are provided with wear-resistant layers 17 towards the left inclined iron 14 or the right inclined iron 10, so as to reduce the amount of wear and ensure the forming precision.
[0024] The front and rear sides of the female die lower pad 16 are respectively provided with sliding guide plates 4 for clamping the left lobe female die 13 and the right lobe female die 12. The upper surface of the lower die plate 6 is symmetrically provided with a pair of guide columns 2, and the lower surface of the upper die plate 9 is provided with guide sleeves 1 corresponding to the guide columns 2.
[0025] Operation method:
[0026] 1. Place the pipe between the left lobe female die 13 and the right lobe female die 12.
[0027] 2、The upper die plate 9 drives the punch 11, the polyurethane columnar inner die 15, the left inclined iron 14 and the right inclined iron 10 to move downward synchronously to close the mold, the lower end of the left inclined iron 14 is inserted between the side limiting block 3 and the left valve body concave die 13, the lower end of the right inclined iron 10 is inserted between the side limiting block 5 and the right valve body concave die 12 (the reset spring 8 is compressed), so that the left valve body concave die 13 and the right valve body concave die 12 are pushed to move towards each other and are spliced together and clamp the pipe, at the same time, the polyurethane columnar inner die 15 is inserted into the pipe, and the lower end edge of the punch 11 abuts against the upper end of the pipe.
[0028] 3、The upper die plate 9 drives the punch 11, the polyurethane columnar inner die 15, the left inclined iron 14 and the right inclined iron 10 to continue to move downward, the polyurethane columnar inner die 15 is deformed radially under stress, and the pipe is driven to generate hump-shaped deformation at the annular bulging groove 18 of the split concave die, and the hump forming of the pipe is completed.
[0029] 4、The upper die plate 9 drives the punch 11, the polyurethane columnar inner die 15, the left inclined iron 14 and the right inclined iron 10 to move upward synchronously, the left inclined iron 14 and the right inclined iron 10 are released from the limiting, and the reset spring 8 drives the left valve body concave die 13 and the right valve body concave die 12 to return to the separated state, so that the formed pipe can be taken out.
[0030] The above embodiment of the utility model is described in detail, but the content is only the preferred embodiment of the utility model, and cannot be considered as limiting the scope of the utility model. Any equivalent change and improvement within the scope of the utility model is still within the scope of the patent.
Claims
1. A pipe hump internal expansion forming die comprising an upper die plate, a lower die plate, a male die provided on the lower surface of the upper die plate, a female die lower pad provided on the upper surface of the lower die plate, and a split female die located above the female die lower pad, characterized in that: The split die is split from a left half die and a right half die, inner walls of the left half die and the right half die split to form a cylindrical cavity corresponding to the pipe fitting, the inner wall of the cylindrical cavity is provided with a concentric annular bulging groove, the cross section of the annular bulging groove is hump-shaped, the punch is located directly above the cylindrical cavity and a polyurethane cylindrical inner die is fixed to the lower end of the punch, the left and right sides of the die lower pad are respectively fixed with side limiting blocks, the side limiting blocks are provided with horizontal through holes and connecting rods are arranged in the horizontal through holes, the connecting rods are located at opposite sides of the left half die and the right half die, the front end of the connecting rod is connected with the left half die or the right half die, the rear section of the connecting rod is sleeved with a return spring and the return spring is clamped between the rear end of the connecting rod and the side limiting block, the lower surface of the upper die plate is provided with a left inclined iron for insertion between the side limiting block and the left half die and a right inclined iron for insertion between the side limiting block and the right half die.
2. The tube hump internal expansion forming die of claim 1, wherein: The lower end of the left inclined iron and the right inclined iron is provided with an avoiding opening corresponding to the connecting rod.
3. The tube hump internal expansion forming die of claim 1, wherein: The front and rear sides of the die lower pad are respectively provided with sliding guide plates for clamping the left half die and the right half die.
4. The tube hump internal expansion forming die of claim 1, wherein: The opposite upper ends of the left half die and the right half die are respectively provided with inclined guide surfaces matched with the left inclined iron or the right inclined iron.
5. The tube hump internal expansion forming die of claim 1, wherein: The side limiting block is provided with a wear-resistant layer towards the left inclined iron or the right inclined iron.
6. The tube hump internal expansion forming die of claim 1, wherein: The upper surface edge of the lower die plate is symmetrically provided with a pair of guide columns, and the lower surface of the upper die plate is provided with guide sleeves corresponding to the guide columns.
7. The tube hump internal expansion forming die of claim 1, wherein: The inner diameter of the cylindrical cavity formed by the left half die and the right half die is equal to the outer diameter of the pipe fitting, the outer diameter of the punch is equal to the outer diameter of the pipe fitting, and the outer diameter of the polyurethane cylindrical inner die is equal to the inner diameter of the pipe fitting.