Die suitable for drawing forming of microtube

Abstract

The invention relates to the technical field of micropipe drawing forming, in particular to a mold suitable for micropipe drawing forming. Comprising a plurality of die mounting seats, the die mounting seats are mounted on a fixing support at intervals, a drawing die is fixedly mounted in each die mounting seat, the diameters of a plurality of forming holes are sequentially increased or decreased from left to right, a pipe blank sequentially penetrates through the forming holes, a mandrel is arranged in the pipe blank in a penetrating mode, and the mandrel is connected with the die mounting seats. A supporting mechanism is arranged on one side of a feeding port of each drawing die, and a detecting mechanism is arranged on one side of a discharging port of each drawing die. The supporting mechanism can preshape a pipe blank about to enter the drawing die, so that the deformation uniformity of the pipe blank is guaranteed, the detection mechanism can detect the size and the appearance of the formed pipe blank, the product quality can be guaranteed, meanwhile, the abrasion condition of the die can be reflected, and the production efficiency is improved. And a worker is prompted to replace in time.

Description

Technical Field

[0001] The present invention relates to the technical field of microtube drawing forming, and particularly relates to a mold suitable for microtube drawing forming. Background Art

[0002] Microtubes generally refer to thin tubes with very small diameters. Microtubes are usually formed by drawing, and a drawing die is usually required during the microtube drawing forming process. The existing dies cannot ensure the uniformity of the deformation of the tube blank, which easily causes the problem of inconsistent wall thickness dimensions after forming. Moreover, the existing dies are prone to wear after long-term use, and the wear cannot be detected by the staff in time, resulting in the size of the formed microtubes not meeting the requirements. Therefore, there is an urgent need to design a mold suitable for microtube drawing forming to solve the above problems. Summary of the Invention

[0003] In view of the above problems in the prior art, the present invention provides a mold suitable for microtube drawing forming, and specifically discloses the following technical solutions:

[0004] A mold suitable for microtube drawing forming includes a plurality of mold mounting seats. The plurality of mold mounting seats are spaced apart and mounted on a fixed bracket. A drawing die is fixedly installed in each mold mounting seat. The forming holes at the centers of the plurality of drawing dies are all located on the same straight line, and the diameters of the plurality of forming holes increase or decrease in sequence from left to right. The tube blank passes through the plurality of forming holes in sequence, and a mandrel is inserted into the tube blank. A support mechanism is provided on one side of the feed port of each drawing die for supporting the tube blank, and a detection mechanism is provided on one side of the discharge port of each drawing die for detecting the diameter of the tube blank after drawing forming.

[0005] Further, a positioning core head cooperating with each forming hole is fixedly connected to the mandrel.

[0006] Further, the support mechanism includes a first outer support sleeve and an inner support assembly. The first outer support sleeve is sleeved outside the tube blank, the inner wall of the first outer support sleeve is in contact with the outer wall of the tube blank, a first flange is fixedly connected to the outer wall of the first outer support sleeve, and the first flange is fixed to the end face of the mold mounting seat by bolts. The inner support assembly is arranged inside the tube blank and fixedly connected to the mandrel, and the inner support assembly is used for supporting the inner side of the tube blank.

[0007] Further, the inner support assembly includes a fixed column fixedly connected to the mandrel. A plurality of rollers are circumferentially installed on both sides of the fixed column, and the rollers are in contact with the inner wall of the tube blank. A support ring is fixedly connected to the middle of the fixed column, and the side of the support ring away from the fixed column is in contact with the inner wall of the tube blank.

[0008] Further, the detection mechanism includes a second outer support sleeve covering the outside of the tube blank. A second flange is fixedly connected to the outer wall of the second outer support sleeve, and the second flange is fixedly connected to the end face of the mold mounting seat by bolts. A plurality of elastic pressure detection components are evenly installed along the circumference on the inner side wall of the second outer support sleeve. One end of each elastic pressure detection component away from the second outer support sleeve is connected with an arc-shaped pressing plate, and a plurality of arc-shaped pressing plates are butted to form a cylinder, and the inner diameter of the cylinder is the same as the aperture of the corresponding forming hole.

[0009] Further, the elastic pressure detection component includes a first sleeve, a second sleeve rod, a spring and a pressure sensor. One end of the first sleeve is fixedly connected to the inner wall of the second outer support sleeve, and the other end internally slidably installs the second sleeve rod. The end of the second sleeve rod away from the first sleeve is fixedly connected to the arc-shaped pressing plate. The spring is sleeved outside the first sleeve, one end of the spring is fixedly connected to the second outer support sleeve, and the other end is fixedly connected to the arc-shaped pressing plate. The pressure sensor is installed on the inner wall of the second outer support sleeve and is located inside the first sleeve, and the pressure sensor is in contact with the end of the second sleeve rod.

[0010] Further, a lubricating oil storage ring is arranged on the inclined surface of the feed port of the drawing die, and the lubricating oil storage ring is filled with lubricating oil.

[0011] Further, a spiral cooling pipe is arranged around the forming hole inside the drawing die, and the two ends of the spiral cooling pipe are respectively communicated with the liquid inlet and the liquid outlet on the end face of the drawing die.

[0012] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0013] In the present invention, a support mechanism is arranged on one side of the feed port of each drawing die. The support mechanism can pre-shape the tube blank about to enter the drawing die, thereby ensuring the uniformity of the deformation of the tube blank. A detection mechanism is arranged on one side of the discharge port of each drawing die. The detection mechanism can detect the size and shape of the tube blank after forming, which can not only ensure the quality of the product, but also reflect the wear condition of the die to prompt the staff to replace it in time. Description of the Drawings

[0014] Figure 1 This is a sectional view of the overall structure of the present invention.

[0015] Figure 2 is Figure 1 a partial enlarged view of location A in

[0016] Figure 3 is Figure 1 a partial enlarged view of location B in

[0017] 1 - Die mounting base, 2 - Fixed bracket, 3 - Drawing die, 4 - Mandrel, 5 - Tube blank, 6 - Positioning core head, 7 - First outer support sleeve, 8 - Bolt, 9 - Roller, 10 - Support ring, 11 - Second outer support sleeve, 12 - Arc-shaped pressing plate, 13 - First sleeve, 14 - Second sleeve rod, 15 - Spring, 16 - Pressure sensor, 17 - Lubricating oil storage ring, 18 - Spiral cooling pipe. Specific embodiments

[0018] 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 making creative efforts shall fall within the protection scope of the present invention.

[0019] Referring to Figures 1-3 , a die applicable to the drawing forming of microtubes includes a plurality of die mounting bases 1, and the plurality of die mounting bases 1 are spaced apart and mounted on a fixed bracket 2. A drawing die 3 is fixedly installed in each die mounting base 1. The forming holes at the centers of the plurality of drawing dies 3 are all located on the same straight line. The feeding ports of the plurality of drawing dies 3 are all on the same side, and the diameters of the plurality of forming holes increase or decrease in sequence from left to right. The tube blank 5 passes through the plurality of forming holes in sequence, and a mandrel 4 is inserted into the tube blank 5. A support mechanism is provided on one side of the feeding port of each drawing die 3 for supporting the tube blank 5, and a detection mechanism is provided on one side of the discharging port of each drawing die 3 for detecting the diameter of the tube blank 5 after drawing forming. The tube blank 5 first passes through the largest forming hole and is drawn into a tube blank with a smaller diameter under the action of the forming hole, and then continues to enter the smaller forming hole, so as to be drawn into a tube blank 5 with an even smaller diameter, and so on, until a microtube with a predetermined size is obtained.

[0020] In this embodiment, a positioning core head 6 that cooperates with each forming hole is fixedly connected to the mandrel 4. The forming hole and the corresponding positioning core head 6 cooperate to change the tube blank 5 from a large diameter to a small diameter.

[0021] In this embodiment, the support mechanism includes a first outer support sleeve 7 and an inner support assembly. The first outer support sleeve 7 is sleeved outside the tube blank 5, the inner wall of the first outer support sleeve 7 is in contact with the outer wall of the tube blank 5, a first flange is fixedly connected to the outer wall of the first outer support sleeve 7, and the first flange is fixed on the end face of the mold mounting seat 1 by bolts 8. The inner support assembly is arranged inside the tube blank 5 and fixedly connected to the mandrel 4, and the inner support assembly is used to support the inner side of the tube blank 5. The inner support assembly includes a fixing column fixedly connected to the mandrel 4. A plurality of rollers 9 are circumferentially mounted on both sides of the fixing column, and the rollers 9 are in contact with the inner wall of the tube blank 5. A support ring 10 is fixedly connected to the middle of the fixing column, and one side of the support ring 10 away from the fixing column is in contact with the inner wall of the tube blank 5. The support ring 10 inside the tube blank 5 and the first outer support sleeve 7 outside can pre-shape the wall thickness of the tube blank 5 to ensure a uniform distribution of the wall thickness of the tube blank 5. The rollers 9 can roll relative to the tube blank 5, thereby providing guidance for the movement of the tube blank 5.

[0022] In this embodiment, the detection mechanism includes a second outer support sleeve 11. The second outer support sleeve 11 covers the outside of the tube blank 5. A second flange is fixedly connected to the outer wall of the second outer support sleeve 11. The second flange is fixedly connected to the end face of the mold mounting base 1 by bolts 8. A number of elastic pressure detection components are evenly installed along the circumferential direction on the inner side wall of the second outer support sleeve 11. One end of each elastic pressure detection component away from the second outer support sleeve 11 is connected to an arc-shaped pressing plate 12. A number of arc-shaped pressing plates 12 are butted to form a cylinder. The inner diameter of the cylinder is the same as the aperture of the corresponding forming hole. The elastic pressure detection component includes a first sleeve 13, a second sleeve rod 14, a spring 15 and a pressure sensor 16. One end of the first sleeve 13 is fixedly connected to the inner wall of the second outer support sleeve 11, and the other end internally slidably mounts the second sleeve rod 14. The end of the second sleeve rod 14 away from the first sleeve 13 is fixedly connected to the arc-shaped pressing plate 12. The spring 15 is sleeved outside the first sleeve 13. One end of the spring 15 is fixedly connected to the second outer support sleeve 11, and the other end is fixedly connected to the arc-shaped pressing plate 12. The pressure sensor 16 is installed on the inner wall of the second outer support sleeve 11 and is located inside the first sleeve 13. The pressure sensor 16 just contacts the end of the second sleeve rod 14. After the tube blank 5 is formed through the forming hole, it will pass through the cylinder formed by the arc-shaped pressing plates 12. Under normal circumstances, the tube blank 5 will not exert pressure on the arc-shaped pressing plate 12. However, when the forming hole is severely worn, its shape will change and the diameter will become larger. Therefore, the shape of the tube blank 5 processed by it will also change and the size will become larger. Then when the tube blank 5 passes through the cylinder, it will exert pressure on the corresponding arc-shaped pressing plate 12. At this time, the arc-shaped pressing plate 12 will drive the second sleeve rod 14 to squeeze the pressure sensor 16, causing the value of the pressure sensor 16 to change, thereby prompting the staff to replace the drawing die 3. In this embodiment, a number of pressure sensors 16 can be electrically connected to the display screen on the fixed bracket 2, so as to display the readings of each pressure sensor 16 through the display screen.

[0023] In this embodiment, a lubricating oil storage ring 17 is provided on the inclined surface of the feed inlet of the drawing die 3. The lubricating oil storage ring 17 is filled with lubricating oil, so as to lubricate the outer wall of the tube blank 5, reduce the friction between the tube blank 5 and the forming hole, and thus ensure the quality of drawing forming.

[0024] In this embodiment, a spiral cooling pipe 18 is arranged around the forming hole inside the drawing die 3. The two ends of the spiral cooling pipe 18 are respectively communicated with the liquid inlet and the liquid outlet on the end face of the drawing die 3. The liquid inlet and the liquid outlet are connected to an external coolant circulation system, so as to realize the circulating supply of coolant into the spiral cooling pipe 18 to dissipate heat and cool down the drawing die 3.

[0025] The above are only the preferred embodiments of the present invention, and do not impose any limitation on the technical scope of the present invention. Therefore, any minor modifications, equivalent changes, and decorations made to the above embodiments based on the technical essence of the present invention still fall within the scope of the technical solution of the present invention.

Claims

1. A mold applicable to microtube drawing forming, characterized in that, It includes several die mounting seats, and the several die mounting seats are spaced and mounted on a fixed bracket. A drawing die is fixedly mounted in each die mounting seat. The forming holes at the centers of the several drawing dies are all located on the same straight line, and the diameters of the several forming holes increase or decrease in sequence from left to right. A tube blank sequentially passes through the several forming holes, and a mandrel is inserted into the tube blank. A support mechanism is arranged on one side of the feed port of each drawing die for supporting the tube blank, and a detection mechanism is arranged on one side of the discharge port of each drawing die for detecting the diameter of the tube blank after drawing and forming.

2. The mold applicable to microtube drawing forming according to claim 1, characterized in that, A positioning core head matching with each forming hole is fixedly connected to the mandrel.

3. A mold applicable to microtube drawing forming according to claim 1, characterized in that, The support mechanism includes a first outer support sleeve and an inner support assembly. The first outer support sleeve is sleeved outside the tube blank, and the inner wall of the first outer support sleeve is in contact with the outer wall of the tube blank. A first flange is fixedly connected to the outer wall of the first outer support sleeve, and the first flange is fixed to the end face of the die mounting seat by bolts. The inner support assembly is arranged inside the tube blank and fixedly connected to the mandrel, and the inner support assembly is used for supporting the inner side of the tube blank.

4. A mold applicable to microtube drawing forming according to claim 3, characterized in that, The inner support assembly includes a fixed column fixedly connected to the mandrel. A plurality of rollers are respectively mounted on both sides of the fixed column along the circumferential direction, and the rollers are in contact with the inner wall of the tube blank. A support ring is fixedly connected to the middle of the fixed column, and the side of the support ring away from the fixed column is in contact with the inner wall of the tube blank.

5. A mold applicable to microtube drawing forming according to claim 1, characterized in that, The detection mechanism includes a second outer support sleeve covering the outside of the tube blank. A second flange is fixedly connected to the outer wall of the second outer support sleeve, and the second flange is fixedly connected to the end face of the die mounting seat by bolts. A plurality of elastic pressure detection components are evenly mounted on the inner side wall of the second outer support sleeve along the circumferential direction. One end of each elastic pressure detection component away from the second outer support sleeve is connected with an arc-shaped pressing plate, and the several arc-shaped pressing plates are butted to form a cylinder. The inner diameter of the cylinder is the same as the aperture of the corresponding forming hole.

6. The mold applicable to microtube drawing and forming according to claim 5, wherein, The elastic pressure detection component includes a first sleeve, a second sleeve rod, a spring and a pressure sensor. One end of the first sleeve is fixedly connected to the inner wall of the second outer support sleeve, and the other end internally slidably mounts the second sleeve rod. The end of the second sleeve rod away from the first sleeve is fixedly connected with the arc-shaped pressing plate. The spring is sleeved outside the first sleeve, one end of the spring is fixedly connected with the second outer support sleeve, and the other end is fixedly connected with the arc-shaped pressing plate. The pressure sensor is mounted on the inner wall of the second outer support sleeve and located inside the first sleeve, and the pressure sensor is in contact with the end of the second sleeve rod.

7. A mold applicable to microtube drawing forming according to claim 1, characterized in that, A lubricating oil storage ring is formed on the inclined surface of the feed port of the drawing die, and the lubricating oil storage ring is filled with lubricating oil.

8. A mold applicable to microtube drawing forming according to claim 1, characterized in that, A spiral cooling pipe is arranged inside the drawing die around the forming hole, and the two ends of the spiral cooling pipe are respectively communicated with a liquid inlet and a liquid outlet on the end face of the drawing die.

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