A stretching die for a nano-coated copper tube

Abstract

The present invention discloses a stretching die for a nano-coated copper tube, including a die mounting base in which an installation cavity is provided, a stretching die body disposed in the installation cavity, and a stretching hole with a diamond nano-coating on its surface is provided in the stretching die body. A cotton ring is provided on one side of the stretching hole, and a stretching oil conveying mechanism is used to drive a connecting disk to rotate during the movement of the copper tube. The oil guiding assembly is used to guide the stretching oil to the cotton ring and smear the outer surface of the copper tube through the cotton ring; when the copper tube drives the first pulley to start rotating during the drawing process, the cotton ring that absorbs the stretching oil will evenly smear the stretching oil on the outer surface of the copper tube, solving the problem of great danger when manually brushing the stretching oil on the surface of the copper tube. At the same time, the nano-coating provided on the surface of the stretching hole can enhance the wear resistance, improve the service life of the stretching die body, and improve the qualification rate of the copper tube after stretching.

Description

Technical Field

[0001] The present invention relates to the technical field of stretching dies, and particularly to a stretching die for a nano-coated copper tube. Background Art

[0002] A copper tube stretching die refers to a die that stretches a semi-finished blank of a copper tube into a product with a certain size and cross-sectional shape; for example, a Chinese patent with the publication number CN208390676U discloses a pipe drawing die, which includes a drawing die sleeve and an inner die sleeve. The inner die sleeve is installed inside the drawing die sleeve, and the pipe drawing die further includes a bearing, and the bearing is installed between the inner die sleeve and the drawing die sleeve.

[0003] However, the above solution has the following deficiencies: Although the above patent solves the problem that the friction force on the tube blank is increased due to the dragging operation of the tube blank between the dies, which easily leads to the fracture of the tube blank, during the drawing process of the copper tube, in order to ensure that the surface roughness of the copper tube after stretching is not too low, and at the same time ensure that the surface of the die does not become roughened due to poor lubrication, it is often necessary to apply stretching oil to the surface of the copper tube before stretching to ensure that the above problems do not occur during the stretching of the copper tube. However, when applying stretching oil to the surface of the copper tube manually, it is dangerous, and at the same time, it cannot ensure that the surface of the copper tube can be evenly coated with stretching oil. At the same time, due to the long-term stretching process of the copper tube, the surface of the die will become roughened or severely worn, resulting in the size of the drawn copper tube exceeding the standard range and causing waste of products. Therefore, we introduce a stretching die for a nano-coated copper tube. Summary of the Invention

[0004] The purpose of the present invention is to provide a stretching die for a nano-coated copper tube to solve the problems raised in the above background art.

[0005] To achieve the above purpose, the present invention provides the following technical solutions:

[0006] A stretching die for a nano-coated copper tube, used for stretching a copper tube, includes:

[0007] A die mounting seat, in which an installation cavity is provided;

[0008] A stretching die body, which is arranged in the installation cavity, and a stretching hole with a diamond nano-coating on its surface is provided in the stretching die body, and a cotton ring is arranged on one side of the stretching hole;

[0009] The stretching oil delivery mechanism includes a trigger assembly and an oil guide assembly. The trigger assembly is arranged in the installation cavity and is used to drive the connecting plate to rotate during the movement of the copper tube. The oil guide assembly is used to guide the stretching oil to the cotton ring and apply it to the outer surface of the copper tube through the cotton ring.

[0010] Preferably, the trigger assembly includes a connecting seat, the connecting seat is movably connected to the give way cavity, the give way cavity is opened in the mounting cavity, the lower end of the connecting seat is movably connected with a first pulley, a belt is clamped in the first pulley, the other end of the belt is clamped with the second pulley, the second pulley is fixedly connected to the lower end of the connecting plate, the connecting plate is movably connected to the second liquid storage cavity, the second liquid storage cavity is opened in the mold mounting seat, two groups of through holes are opened in the lower end of the second liquid storage cavity, the through holes are connected with the first liquid storage cavity, the first liquid storage cavity is opened in the mold mounting seat, a liquid guide hole is opened in the lower end of the first liquid storage cavity, and two groups of drainage holes are opened in the connecting plate.

[0011] Preferably, the oil guide assembly includes a liquid guide tube, which is movably connected to the upper end of the connecting ring, and the lower end of the liquid guide tube extends into the connecting cavity. The connecting cavity is opened in the connecting ring, and the cotton ring is fixedly connected to the inner side of the connecting ring, and the upper end of the cotton ring extends into the connecting cavity. The connecting ring is fixedly connected to the stretching mold body.

[0012] Preferably, a limiting ring is fixedly sleeved on the outer side of the liquid guiding tube, the limiting ring is slidably connected in the limiting cavity, the limiting cavity is opened in the connecting ring, a first spring is sleeved on the outer side of the liquid guiding tube, one end of the first spring is fixedly connected to the limiting cavity, and the other end is fixedly connected to the limiting ring, and a plurality of groups of liquid inlet holes are opened in the upper side of the liquid guiding tube.

[0013] Preferably, a plug is provided on the upper side of the liquid guide hole, and two groups of T-rods are fixedly connected to the lower end of the plug. The T-rods are slidably connected in a sliding cavity, and the sliding cavity is opened in the lower end of the first liquid storage cavity. A second spring is sleeved on the outer side of the T-rod, and one end of the second spring is fixedly connected to the sliding cavity, and the other end is fixedly connected to the T-rod.

[0014] Preferably, an adjusting guide wheel is provided in the connecting seat, and the adjusting guide wheel is movably connected to the T-shaped support rod, and the T-shaped support rod is movably connected to the guide cavity, and the guide cavity is opened in the connecting seat. A third spring is sleeved on the outer side of the T-shaped support rod, one end of the third spring is fixedly connected to the guide cavity, and the other end is fixedly connected to the T-shaped support rod, and a belt is clamped in the adjusting guide wheel.

[0015] Preferably, sliders are fixedly connected on both sides of the connecting seat, the sliders are slidably connected in the slide groove, the slide groove is opened in the give way cavity, a return spring is fixedly connected in the slide groove, one end of the return spring is fixedly connected to the slide groove, and the other end is fixedly connected to the slider.

[0016] Preferably, a number of sets of screw holes are provided inside the outer side of the stretching die body, a number of sets of storage holes are provided inside the die mounting seat, threaded rods are provided inside the storage holes, and the threaded rods are screwed into the screw holes.

[0017] Compared with the prior art, the beneficial effects of the present invention are as follows: during the drawing process of the copper tube, the first pulley is driven to rotate, the belt clamped inside the first pulley drives the second pulley to rotate, the rotation of the second pulley causes the connecting disc to rotate, so that the stretching oil located in the second liquid storage cavity passes through the liquid discharge hole and the through hole and enters the first liquid storage cavity. After the stretching oil finally enters the connecting cavity, it will be absorbed by the cotton ring. At this time, during the movement of the copper tube, the cotton ring that has absorbed the stretching oil will evenly apply the stretching oil on the outer surface of the copper tube, solving the problem of high danger when manually brushing the stretching oil on the surface of the copper tube. At the same time, the nano-coating provided on the surface of the stretching hole can enhance the wear resistance, improve the service life of the stretching die body, and improve the qualification rate of the copper tube after stretching. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is a schematic cross-sectional structure diagram of the present invention;

[0019] Figure 2 is the present invention Figure 1 is an enlarged schematic structure diagram at A in the figure;

[0020] Figure 3 is the present invention Figure 1 is an enlarged schematic structure diagram at B in the figure;

[0021] Figure 4 is a three-dimensional cross-sectional structure diagram of the stretching die body of the present invention;

[0022] Figure 5 is a three-dimensional cross-sectional structure diagram of the die mounting seat of the present invention;

[0023] Figure 6 is a three-dimensional structure diagram of the connecting seat of the present invention;

[0024] Figure 7 is a cross-sectional structure diagram of the connecting seat of the present invention.

[0025] In the figure: 1. Mold mounting base; 2. Stretching hole; 3. Stretching die body; 4. Installation cavity; 5. First pulley; 6. Belt; 7. Yielding cavity; 8. Return spring; 9. Chute; 10. Connection cavity; 11. Connection ring; 12. Cotton ring; 13. Second liquid storage cavity; 14. Threaded rod; 15. Plug; 16. Second pulley; 17. Connection plate; 18. Drainage hole; 19. Liquid guide pipe; 20. Threaded connection hole; 21. Storage hole; 22. Through hole; 23. Liquid guide hole; 24. First liquid storage cavity; 25. Connection seat; 26. Slide block; 27. T-shaped support rod; 28. Guide cavity; 29. Third spring; 30. Adjusting guide wheel; 31. T-shaped rod; 32. Limiting cavity; 33. First spring; 34. Limiting ring; 35. Liquid inlet hole; 36. Sliding connection cavity; 37. Second spring. Detailed implementation mode

[0026] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of the present invention.

[0027] Please refer to Figure 1-7 , the present invention provides a technical solution:

[0028] Embodiment 1:

[0029] A nano-coated copper tube stretching die for stretching copper tubes, comprising:

[0030] A mold mounting base 1, in which an installation cavity 4 is provided. After the operator installs the mold mounting base 1, the stretching die body 3 corresponding to the hole pitch required for stretching the copper tube can be selected and installed in the installation cavity 4.

[0031] A stretching die body 3, which is arranged in the installation cavity 4, and a stretching hole 2 with a diamond nano-coating on its surface is provided in the stretching die body 3. The stretching die body 3 is made of hard alloy YG8. During the manufacturing process of the stretching die body 3, the surface adhesion is removed by sandblasting, and the stretching die body 3 is subjected to hot wire winding heat treatment, so that the Co on the surface of the stretching die body 3 is removed, and the WC particles on the surface of the stretching die body 3 are coarsened. A cotton ring 12 is arranged on one side of the stretching hole 2;

[0032] The gases that react with the nano coating during the coating process are hydrogen and methane, and the carbon source ratio in the mixture is 2%. The surface temperature of the stretching hole 2 is maintained at 800-900°C. The reaction is divided into two steps. The first step is to effectively control the size of the micron diamond particles that are finally grown by controlling factors such as reaction pressure, methane concentration, heating temperature, substrate temperature, etc. The second step is to change the heating temperature and adjust the carbon source ratio, which can effectively control the size of the nano diamond particles grown on the surface and effectively reduce the surface roughness of the nano coating. The nano coating is composed of a micro diamond coating and a nano diamond coating combined with the micro diamond coating, which can improve the bonding strength of the entire coating, and at the same time is conducive to reducing the surface roughness of the nano coating, reducing friction, and improving wear resistance;

[0033] The stretching oil delivery mechanism includes a trigger assembly and an oil guide assembly. The trigger assembly is arranged in the installation cavity 4 and is used to drive the connecting plate 17 to rotate during the movement of the copper tube. The oil guide assembly is used to guide the stretching oil to the cotton ring 12 and apply it to the outer surface of the copper tube through the cotton ring 12.

[0034] Embodiment 2:

[0035] On the basis of Example 1, in order to make the belt 6 always in a taut state after the connecting seat 25 moves upward, and at the same time make the liquid guide tube 19 able to enter the liquid guide hole 23 when it moves to the position of the liquid guide hole 23, the trigger assembly includes a connecting seat 25, the connecting seat 25 is movably connected to the give way cavity 7, the give way cavity 7 is opened in the installation cavity 4, the lower end of the connecting seat 25 is movably connected to the first pulley 5, the first pulley 5 is clamped with the belt 6, the other end of the belt 6 is clamped with the second pulley 16, the second pulley 16 is fixedly connected to the lower end of the connecting disk 17, the connecting disk 17 is movably connected to the second liquid storage cavity 13, the second liquid storage cavity 13 is opened in the mold mounting seat 1, and the second liquid storage cavity Two groups of through holes 22 are provided in the lower end of 13, and the through holes 22 are connected with the first liquid storage cavity 24. The first liquid storage cavity 24 is provided in the mold mounting seat 1, and a liquid guide hole 23 is provided in the lower end of the first liquid storage cavity 24. Two groups of liquid discharge holes 18 are provided in the connecting plate 17. When the copper tube enters the mounting cavity 4, the first pulley 5 will be squeezed to move upward, and the connecting seat 25 will drive the slider 26 to move synchronously along the slide groove 9. At this time, the return spring 8 located in the slide groove 9 is compressed. At the same time, under the elastic force of the compressed return spring 8, the lower end of the first pulley 5 will always be in contact with the upper surface of the copper tube, so that the copper tube can drive the first pulley 5 to rotate during the movement;

[0036] The oil guiding assembly includes a liquid guiding pipe 19. The liquid guiding pipe 19 is movably connected to the inside of the upper end of the connecting ring 11. The lower end of the liquid guiding pipe 19 extends into the connecting cavity 10. The connecting cavity 10 is opened in the connecting ring 11. The cotton ring 12 is fixedly connected to the inner side of the connecting ring 11. The upper end of the cotton ring 12 extends into the connecting cavity 10. The connecting ring 11 is fixedly connected to the stretching die body 3. The stretching oil entering the first liquid storage cavity 24 enters the liquid guiding pipe 19 through a plurality of groups of liquid inlet holes 35. The stretching oil entering the liquid guiding pipe 19 will enter the connecting cavity 10 and will ultimately be absorbed by the cotton ring 12. When the moving copper pipe passes through the cotton ring 12, the stretching oil will be smeared on the surface of the copper pipe;

[0037] A limiting ring 34 is fixedly sleeved on the outer side of the liquid guiding pipe 19. The limiting ring 34 is slidably connected to the limiting cavity 32. The limiting cavity 32 is opened in the connecting ring 11. A first spring 33 is sleeved on the outer side of the liquid guiding pipe 19. One end of the first spring 33 is fixedly connected to the limiting cavity 32, and the other end is fixedly connected to the limiting ring 34. A plurality of groups of liquid inlet holes 35 are opened in the upper side of the liquid guiding pipe 19. Since the aperture of the liquid inlet holes 35 is small, when the stretching oil enters the first liquid storage cavity 24, it will be temporarily stored. The stored stretching oil will slowly enter the liquid guiding pipe 19 through the liquid inlet holes 35, preventing a large amount of stretching oil from entering the connecting cavity 10 due to the large aperture of the liquid inlet holes 35, resulting in waste of the stretching oil;

[0038] A plug 15 is provided on the upper side of the liquid guiding hole 23. Two T-shaped rods 31 are fixedly connected to the lower end of the plug 15. The T-shaped rods 31 are slidably connected to the sliding cavity 36. The sliding cavity 36 is opened in the lower end of the first liquid storage cavity 24. A second spring 37 is sleeved on the outer side of the T-shaped rods 31. One end of the second spring 37 is fixedly connected to the sliding cavity 36, and the other end is fixedly connected to the T-shaped rods 31. When the liquid guiding pipe 19 moves to the position of the liquid guiding hole 23, at this time, under the elastic force of the first spring 33, the liquid guiding pipe 19 will be clamped into the liquid guiding hole 23 and push out the plug 15 used to block the liquid guiding hole 23;

[0039] An adjusting guide wheel 30 is provided in the connecting seat 25, and the adjusting guide wheel 30 is movably connected to the T-shaped support rod 27, and the T-shaped support rod 27 is movably connected to the guide cavity 28. The guide cavity 28 is opened in the connecting seat 25, and a third spring 29 is sleeved on the outer side of the T-shaped support rod 27. One end of the third spring 29 is fixedly connected to the guide cavity 28, and the other end is fixedly connected to the T-shaped support rod 27. The belt 6 is clamped in the adjusting guide wheel 30. When the connecting seat 25 moves upward, under the elastic force of the third spring 29, the T-shaped support rod 27 will move into the guide cavity 28. At this time, the adjusting guide wheel 30 will move with the T-shaped support rod 27 and pull the belt 6 clamped therewith, so that the belt 6 is always in a taut state. Since the elastic force of the reset spring 8 is greater than the elastic force of the third spring 29, when the copper tube is stretched, the connecting seat 25 will move downward under the elastic force of the reset spring 8, and the T-shaped support rod 27 is stretched out from the guide cavity 28.

[0040] Slide blocks 26 are fixedly connected to both sides of the connecting seat 25. The slide blocks 26 are slidably connected to the slide groove 9. The slide groove 9 is opened in the give way cavity 7. A return spring 8 is fixedly connected to the slide groove 9. One end of the return spring 8 is fixedly connected to the slide groove 9, and the other end is fixedly connected to the slide block 26. Several groups of screw holes 20 are opened in the outer side of the stretching mold body 3, and several groups of storage holes 21 are opened in the mold mounting seat 1. Threaded rods 14 are arranged in the storage holes 21, and the threaded rods 14 are screwed into the screw holes 20.

[0041] Working principle: when in use, install the mold mounting seat 1 and the stretching device together. After the installation is completed, insert the left end of the stretching mold body 3 into the installation cavity 4. During the insertion process, ensure that the liquid guide tube 19 at the upper end of the stretching mold body 3 is upward. After the stretching mold body 3 enters the installation cavity 4, the liquid guide tube 19 is squeezed and moved downward. The liquid guide tube 19 drives the limit ring 34 to move synchronously along the limit cavity 32. At this time, the first spring 33 is compressed by the limit ring 34. When the liquid guide tube 19 moves to the liquid guide hole 23 , at this time, under the elastic force of the first spring 33, the liquid guiding tube 19 enters into the liquid guiding hole 23, and the plug 15 clamped in the liquid guiding hole 23 moves upward under the extrusion of the liquid guiding tube 19. The upward movement of the plug 15 drives the two groups of T-shaped rods 31 connected to its lower end to move synchronously. At this time, the second spring 37 is compressed. When the liquid guiding tube 19 is completely clamped into the liquid guiding hole 23, the four groups of threaded rods 14 are tightened to be screwed into the screw connection holes 20, and the stretching die body 3 is installed in the installation cavity 4;

[0042] The connecting pipe arranged inside the upper end of the die mounting seat 1 can be used to inject stretching oil into the second liquid storage cavity 13. After the injection is completed, the copper pipe to be stretched can be inserted into the stretching hole 2 from the left side of the installation cavity 4. When the copper pipe is being stretched, since the first pulley 5 will always be in contact with the surface of the copper pipe under the elastic force of the return spring 8, when the copper pipe moves from left to right, at this time the first pulley 5 will be driven to start rotating. The rotation of the first pulley 5 drives the belt 6 to start rotating. At this time, the second pulley 16 starts rotating and drives the connecting disk 17 to rotate synchronously. When the drain hole 18 formed in the connecting disk 17 rotates to the position of the through hole 22, at this time the stretching oil located in the second liquid storage cavity 13 will respectively pass through the drain hole 18 and the through hole 22 and enter into the first liquid storage cavity 24. The stretching oil entering into the first liquid storage cavity 24 enters into the liquid guide pipe 19 through a plurality of groups of liquid inlet holes 35. The stretching oil entering into the liquid guide pipe 19 will enter into the connecting cavity 10 and is finally absorbed by the cotton ring 12. When the moving copper pipe passes through the cotton ring 12, the stretching oil will be smeared on the surface of the copper pipe. When the drain hole 18 located in the connecting disk 17 is no longer aligned with the through hole 22 after continuing to rotate, at this time the stretching oil will no longer enter into the first liquid storage cavity 24, preventing the waste of stretching oil caused by the continuous supply of stretching oil.

[0043] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A nano-coated copper tube drawing die for drawing copper tubes, characterized in that, include: A mold mounting seat (1), wherein a mounting cavity (4) is provided in the mold mounting seat (1); A stretching die body (3), wherein the stretching die body (3) is arranged in the mounting cavity (4), and a stretching hole (2) having a surface coated with a diamond nano coating is provided in the stretching die body (3), and a cotton ring (12) is provided on one side of the stretching hole (2); The stretching oil conveying mechanism comprises a trigger assembly and an oil guide assembly, wherein the trigger assembly is arranged in an installation cavity (4) and is used to drive a connecting plate (17) to rotate during the movement of the copper tube, wherein the trigger assembly comprises a connecting seat (25), wherein the connecting seat (25) is movably connected to a clearance cavity (7), wherein the clearance cavity (7) is opened in the installation cavity (4), wherein a first pulley (5) is movably connected to the lower end of the connecting seat (25), wherein a belt (6) is clamped in the first pulley (5), wherein the other end of the belt (6) is clamped to a second pulley (16), wherein the second pulley The wheel (16) is fixedly connected to the lower end of the connecting plate (17), and the connecting plate (17) is movably connected to the second liquid storage cavity (13). The second liquid storage cavity (13) is opened in the mold mounting seat (1), and two groups of through holes (22) are opened in the lower end of the second liquid storage cavity (13). The through holes (22) are connected to the first liquid storage cavity (24). The first liquid storage cavity (24) is opened in the mold mounting seat (1), and a liquid guide hole (23) is opened in the lower end of the first liquid storage cavity (24). The connecting plate (17) is provided with two groups of liquid discharge holes (18); The oil guide assembly is used to guide the stretching oil to the cotton ring (12) and to apply the stretching oil to the outer surface of the copper tube through the cotton ring (12).

2. The stretching die for a nano-coated copper tube according to claim 1, characterized in that: The oil guide assembly comprises a liquid guide tube (19), the liquid guide tube (19) is movably connected to the upper end of the connecting ring (11), the lower end of the liquid guide tube (19) extends into the connecting cavity (10), the connecting cavity (10) is opened in the connecting ring (11), the cotton ring (12) is fixedly connected to the inner side of the connecting ring (11), the upper end of the cotton ring (12) extends into the connecting cavity (10), and the connecting ring (11) is fixedly connected to the stretching die body (3).

3. The stretching die for a nano-coated copper tube according to claim 2, wherein: A limiting ring (34) is fixedly sleeved on the outer side of the liquid guiding tube (19), and the limiting ring (34) is slidably connected to the limiting cavity (32). The limiting cavity (32) is opened in the connecting ring (11). A first spring (33) is sleeved on the outer side of the liquid guiding tube (19), and one end of the first spring (33) is fixedly connected to the limiting cavity (32), and the other end is fixedly connected to the limiting ring (34). A plurality of groups of liquid inlet holes (35) are opened on the upper side of the liquid guiding tube (19).

4. A stretching die for a nano-coated copper tube according to claim 1, wherein: A plug (15) is provided on the upper side of the liquid guide hole (23); two groups of T-shaped rods (31) are fixedly connected to the lower end of the plug (15); the T-shaped rods (31) are slidably connected in a sliding cavity (36); the sliding cavity (36) is opened in the lower end of the first liquid storage cavity (24); a second spring (37) is sleeved on the outer side of the T-shaped rod (31); one end of the second spring (37) is fixedly connected to the sliding cavity (36), and the other end is fixedly connected to the T-shaped rod (31).

5. A stretching die for a nano-coated copper tube according to claim 1, characterized in that: An adjusting guide wheel (30) is provided in the connecting seat (25), and the adjusting guide wheel (30) is movably connected to the T-shaped support rod (27), and the T-shaped support rod (27) is movably connected to the guide cavity (28), and the guide cavity (28) is opened in the connecting seat (25). A third spring (29) is sleeved on the outer side of the T-shaped support rod (27), and one end of the third spring (29) is fixedly connected to the guide cavity (28), and the other end is fixedly connected to the T-shaped support rod (27). A belt (6) is clamped in the adjusting guide wheel (30).

6. The stretching die for a nano-coated copper tube according to claim 1, characterized in that: Slide blocks (26) are fixedly connected to both sides of the connecting seat (25). The slide blocks (26) are slidably connected in the slide grooves (9). The slide grooves (9) are arranged in the giving way cavity (7). A return spring (8) is fixedly connected in the slide grooves (9). One end of the return spring (8) is fixedly connected to the slide grooves (9), and the other end is fixedly connected to the slide block (26).

7. A stretching die for a nano-coated copper tube according to claim 1, wherein: The outer side of the stretching die body (3) is provided with a plurality of groups of screw holes (20), the die mounting seat (1) is provided with a plurality of groups of storage holes (21), the storage holes (21) are provided with threaded rods (14), and the threaded rods (14) are screwed into the screw holes (20).

Images