Punch forming die for head of pipe fitting

Abstract

The utility model relates to the technical field of high-pressure oil pipe production equipment, and discloses a pipe fitting head punch forming die which comprises a fixing block, a positioning block and a die body which are sequentially arranged, a first forming groove is formed in the side, facing the die body, of the fixing block, an ejector pin is arranged in the first forming groove, and the die body comprises a first die body and a second die body. D-shaped pipe grooves are formed in the bottom of the first mold and the top of the second mold correspondingly, and second forming grooves are formed in the ends, facing the fixing blocks, of the D-shaped pipe grooves. The high-pressure oil pipe forming die is easy to assemble, the forming precision can be guaranteed, and the forming effect of a high-pressure oil pipe is effectively improved.

Description

Technical Field

[0001] The utility model relates to the technical field of high-pressure oil pipe production equipment, in particular to a pipe head stamping die. Background Art

[0002] As an important component of the diesel engine fuel system, the design and assembly quality of the high-pressure fuel pipe are directly related to the reliability of the engine. During the production of high-pressure fuel pipes, the joints of the high-pressure fuel pipes need to be cold-forged using a forming machine. Therefore, the forming mold is crucial to the forming quality of the pipe head.

[0003] For example, the utility model with patent number CN207592701U discloses a composite cold heading die, which is connected to a cold heading machine. The composite cold heading die includes a cold heading punch and multiple die units. The multiple die units are all provided with forming grooves, and the multiple forming grooves form a forming hole. The die unit includes a base die and a forming die. The forming groove is arranged on the forming die, and the forming die is clamped on the base die. The base die is used to be connected to the cold heading machine.

[0004] There are at least the following problems in the above patents: first, the structure is complex and the assembly process is relatively cumbersome; second, the forming mold is set inside the base mold, which requires high assembly accuracy and cannot guarantee the forming accuracy of the pipe head, which is prone to oil leakage. Utility Model Content

[0005] Aiming at the deficiencies of the prior art, the utility model develops a pipe head stamping forming die. The utility model can be easily assembled and can ensure forming accuracy, thereby effectively improving the forming effect of the high-pressure oil pipe.

[0006] The technical solution to the technical problem solved by the utility model is: a pipe head stamping forming die, comprising a fixed block, a positioning block and a die arranged in sequence, a first forming groove being provided on the side of the fixed block facing the die, a ejector pin being provided in the first forming groove, the die comprising a first die and a second die, a D-shaped tube groove being provided at the bottom of the first die and the top of the second die, and a second forming groove being provided at the end of the D-shaped tube groove facing the fixed block.

[0007] As an optimization, gaps are provided between the positioning block, the fixing block and the die to allow for a sufficient amount of punching capacity.

[0008] As an optimization, a first groove is provided at the bottom of the first mold, and a second groove is provided at the top of the second mold to match the first groove. By providing the first groove and the second groove, it is convenient for workers to load and unload materials.

[0009] As an optimization, a positioning groove is provided on the side of the fixed block away from the mold. The positioning groove is connected to the first forming groove through a pinhole. One end of the ejector pin is positioned in the positioning groove, and the other end is inserted through the pinhole and positioned in the first forming groove. The tip of the ejector pin protrudes from the first forming groove. By providing the positioning groove and pinhole, the ejector pin can be installed so that the tip of the ejector pin can be inserted into the pipe fitting, cooperating with the first and second forming grooves to stamp the pipe fitting head.

[0010] As an optimization, a first mounting slot is provided at the top of the first mold and a second mounting slot is provided at the bottom of the second mold, respectively. The first mounting slot allows the first mold to be mounted on the second lifting device, thereby driving the first mold up and down, thereby opening or closing the mold. The second mounting slot allows the second mold to be fixed to the table, ensuring stability during stamping.

[0011] As an optimization, the first mold is equipped with two sets of first guide holes, and the second mold is equipped with two sets of second guide holes corresponding to the first guide holes. Guide posts are installed in the first guide holes, and the bottoms of the guide posts slide into the second guide holes. By providing first guide holes, guide posts, and second guide holes, the accuracy of mold closing can be guaranteed, deviation during mold closing can be reduced, and the large parting surface of the pipe fitting caused by eccentricity can be reduced, thus avoiding the situation where the pipe fitting is rejected due to excessive parting surface.

[0012] As an optimization, two sets of first guide holes are respectively provided on both sides of the first mounting groove, which can make the lifting and lowering of the first mold more stable, stably clamp the pipe, avoid defects in the forming of the pipe head and prevent damage to the pipe coating.

[0013] Compared with the prior art, the present invention has the following beneficial effects:

[0014] By providing a fixing block, the ejector pin can be fixed and detachably mounted on the punching device of the cold heading machine; by providing a first forming groove, the pipe head can be punched; by providing an ejector pin, the ejector pin can be inserted into the pipe to prevent deformation of the pipe internally and blockage of the oil circuit during punching; by providing a first die, a second die and a D-shaped pipe groove, the pipe can be stably clamped after the die is closed, avoiding defects in the forming of the pipe head and damage to the pipe coating; by providing a second forming groove, the pipe head can be punched in conjunction with the first forming groove to ensure consistency in the forming of the pipe head and improve sealing; by providing a positioning block, the pipe can be mounted on the first lifting device of the cold heading machine. When loading, the first lifting device lowers the positioning block to locate the initial position of the pipe head and reserve an appropriate stamping margin, which can avoid defects in the forming of the pipe head due to too little reservation and damage to the pipe coating due to the inability of the die to clamp the pipe during punching. During punching, the first lifting device raises the positioning block to facilitate the fixing block and the ejector pin to punch the pipe head. The utility model can be easily assembled and can ensure the forming accuracy, thereby effectively improving the forming effect of the high-pressure oil pipe. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic diagram of the overall structure of an embodiment of the present utility model.

[0016] Figure 2 This is a top view of an embodiment of the present utility model.

[0017] Figure 3 for Figure 2 Cross-sectional view along the AA direction.

[0018] Figure 4 for Figure 2 Cross-sectional view along direction BB.

[0019] Figure 5 for Figure 2 A partial enlarged view of area A in the middle.

[0020] In the figure: 1. fixing block; 2. first forming groove; 3. ejector pin; 4. first mold; 5. second mold; 6. D-shaped tube groove; 7. second forming groove; 8. positioning block; 9. first groove; 10. first mounting groove; 11. second groove; 12. second mounting groove; 13. positioning groove; 14. first guide hole; 15. second guide hole; 16. guide column. DETAILED DESCRIPTION

[0021] In order to clearly illustrate the technical features of this solution, the present invention is described in detail below through specific implementation methods and in conjunction with the accompanying drawings.

[0022] Example 1

[0023] Figures 1 to 5 An embodiment of the present invention is as follows: Figures 1 to 5 As shown, a stamping die for a pipe head includes a fixed block 1, a positioning block 8 and a die arranged on a cold heading machine from left to right. The fixed block 1 is provided with a first forming groove 2 on the side facing the die, and a ejector pin 3 is provided in the first forming groove 2. The die includes a first die 4 and a second die 5. The bottom of the first die 4 and the top of the second die 5 are both provided with a D-shaped tube groove 6. The two groups of D-shaped tube grooves 6 cooperate with each other. The end of the D-shaped tube groove 6 facing the fixed block 1 is provided with a second forming groove 7. The forming groove formed by the two groups of second forming grooves 7 after the mold is closed includes a first fillet portion, an arc portion, a bevel portion and a second fillet portion in sequence from the opening to the D-shaped tube groove 6. The fillet radius of the first fillet portion is 0.2 mm, the arc radius of the arc portion is 4.2 mm, and the cone angle θ of the bevel portion is The fillet radius of the second fillet is 1.2mm, and the high-pressure oil pipe fully meets the product requirements after molding.

[0024] By setting the fixing block 1, the ejector pin 3 can be fixed and detachably mounted on the stamping device of the cold heading machine; by setting the first forming groove 2, the pipe head can be stamped; by setting the ejector pin 3, it can be inserted into the pipe to avoid deformation of the pipe and blockage of the oil circuit during stamping; by setting the first mold 4, the second mold 5 and the D-shaped pipe groove 6, the pipe can be stably clamped after the mold is closed to avoid defects in the molding of the pipe head and damage to the pipe plating; by setting the second forming groove 7, the pipe head can be stamped in conjunction with the first forming groove 2 to ensure the consistency of the molding of the pipe head and improve the sealing; by setting the positioning block 8, it can be installed on the first lifting device of the cold heading machine. When loading, the first lifting device lowers the positioning block 8 to locate the initial position of the pipe head to ensure the stamping effect. During stamping, the first lifting device raises the positioning block 8 to facilitate the fixed block 1 and the ejector pin 3 to stamp the pipe head.

[0025] like Figures 1 to 3 As shown, there are gaps between both sides of the positioning block 8 and the fixing block 1 and the die, so that a stamping margin can be reserved.

[0026] like Figure 1 and Figure 3 As shown, the bottom of the first mold 4 is provided with a first groove 9, and the top of the second mold 5 is provided with a second groove 11 that matches the first groove 9. By providing the first groove 9 and the second groove 11, it is convenient for the staff to load and unload materials.

[0027] like Figure 2As shown, a positioning groove 13 is provided on the side of the fixing block 1 away from the mold. The positioning groove 13 communicates with the first forming groove 2 through a pinhole. An ejector pin 3 has a large diameter at one end and a small diameter at the other. One end of the ejector pin 3 is disposed within the positioning groove 13, and the other end passes through the pinhole and is disposed within the first forming groove 2. The tip of the other end of the ejector pin 3 protrudes from the first forming groove 2. By providing the positioning groove 13 and the pinhole, the ejector pin 3 can be installed so that the tip of the other end of the ejector pin 3 can be inserted into the interior of the pipe, cooperating with the first forming groove 2 and the second forming groove 7 to stamp the pipe head.

[0028] like Figures 1 to 4 As shown, the top of the first mold 4 and the bottom of the second mold 5 are respectively provided with a first mounting groove 10 and a second mounting groove 12. The first mounting groove 10 allows the first mold 4 to be mounted on the second lifting device, thereby driving the first mold 4 to rise and fall, thereby opening or closing the mold; the second mounting groove 12 allows the second mold 5 to be fixedly mounted on the table to ensure stability during stamping.

[0029] like Figures 1 to 4 As shown, the first mold 4 is vertically provided with two sets of first guide holes 14. The first guide holes 14 are arranged on one side of the first groove 9 and will not affect the staff from loading and unloading materials into the first groove 9 and the second groove 11. The second mold 5 is vertically provided with two sets of second guide holes 15 corresponding to the first guide holes 14. Guide posts 16 are fixedly installed in the first guide holes 14, and the bottoms of the guide posts 16 are slidably arranged in the second guide holes 15. By providing the first guide holes 14, guide posts 16 and second guide holes 15, the accuracy of mold closing can be guaranteed, the deviation during mold closing can be reduced, the large parting surface of the pipe fitting caused by eccentricity can be reduced, and the situation where the pipe fitting is unqualified due to excessively large parting surface can be avoided.

[0030] like Figure 1 、 Figure 2 and Figure 4 As shown, two groups of first guide holes 14 are respectively provided on both sides of the first mounting groove 10. This can make the first mold 4 more stable in lifting and lowering, stably clamp the pipe, avoid defects in the pipe head molding and prevent damage to the pipe coating.

[0031] The cold heading machine includes a punching device, a first lifting device, and a second lifting device from left to right. The fixing block 1 and the ejector pin 3 are installed on the punching device of the cold heading machine and fixed. The top of the positioning block 8 is installed on the first lifting device of the cold heading machine. The first die 4 is installed on the second lifting device of the cold heading machine. The second die 5 is fixed to the table of the cold heading machine. During stamping, the second lifting device lifts the first die 4, and the first die 4 and the second die 5 are separated, so that the two sets of D-shaped tube grooves 6 are separated, and the first groove 9 and the second groove 11 are further opened. The staff puts the pipe into the D-shaped tube groove 6 of the second die 5 and aligns the head of the pipe with the positioning block 8. The side wall of the cold heading machine abuts against the side wall, and then the second lifting device lowers the first mold 4. Under the action of the guide column 16 and the second guide hole 15, the first mold 4 descends steadily, reducing the deviation during mold closing and clamping the pipe fitting. Under the action of the first groove 9 and the second groove 11, the risk of injury to the staff's hands can be reduced; then, the first lifting device of the cold heading machine raises the positioning block 8, and the punching device of the cold heading machine extends to push the fixed block 1 and the ejector pin 3 to move toward the head of the pipe fitting. The ejector pin 3 is inserted into the inside of the pipe fitting to avoid deformation of the internal pipe fitting and blockage of the oil circuit during stamping. The first molding groove 2 cooperates with the second molding groove 7 to stamp the head of the pipe fitting to ensure the consistency of the molding of the pipe fitting head and improve the sealing.

[0032] The descriptions of the orientation or relative position relationship of the structure in the present invention, such as the orientation or relative position relationship indicated by "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc., are based on the orientation or position relationship shown in the accompanying drawings and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the structure referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation on the present invention.

Claims

1. A stamping die for a pipe fitting head, characterized by: The invention comprises a fixing block (1), a positioning block (8) and a mold which are arranged in sequence. The fixing block (1) is provided with a first forming groove (2) on a side facing the mold. An ejector pin (3) is provided in the first forming groove (2). The mold comprises a first mold (4) and a second mold (5). The bottom of the first mold (4) and the top of the second mold (5) are both provided with a D-shaped tube groove (6). The end of the D-shaped tube groove (6) facing the fixing block (1) is provided with a second forming groove (7).

2. The pipe head stamping die according to claim 1, characterized in that: Gaps are provided between both sides of the positioning block (8) and the fixing block (1) and the mold.

3. The pipe head stamping die according to claim 2, characterized in that: The bottom of the first mold (4) is provided with a first groove (9), and the top of the second mold (5) is provided with a second groove (11) that matches the first groove (9).

4. The pipe head stamping die according to claim 3, characterized in that: A positioning groove (13) is provided on a side of the fixed block (1) away from the mold, the positioning groove (13) being connected to the first molding groove (2) through a pinhole, one end of the ejector pin (3) being arranged in the positioning groove (13), and the other end passing through the pinhole and being arranged in the first molding groove (2), the tip of the other end of the ejector pin (3) being beyond the first molding groove (2).

5. The pipe head stamping die according to any one of claims 1 to 4, characterized in that: A first mounting groove (10) and a second mounting groove (12) are respectively provided on the top of the first mold (4) and the bottom of the second mold (5).

6. The pipe head stamping die according to claim 5, characterized in that: The first mold (4) is provided with two groups of first guide holes (14), the second mold (5) is provided with two groups of second guide holes (15) corresponding to the first guide holes (14), a guide column (16) is provided in the first guide hole (14), and the bottom of the guide column (16) is slidably arranged in the second guide hole (15).

7. The pipe head stamping die according to claim 6, characterized in that: Two groups of first guide holes (14) are respectively arranged on both sides of the first installation groove (10).

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