A cold heading die structure for removing burrs without external power

Abstract

The present invention discloses a cold heading die structure for removing burrs without external power, including a punch part and a die part; the die part includes a die, a burr cutter and a die ejector rod; the punch part includes a punch sleeve, a punch spiral sleeve, a punch ejector rod and a nitrogen spring; a burr cutter is provided inside the die, the burr cutter is fixed inside the die, and the burr cutter itself cannot rotate; the punch sleeve is located inside the punch spiral sleeve, the punch spiral sleeve is used to fix the punch sleeve and allow the punch sleeve to rotate; a plurality of nitrogen springs are evenly distributed inside the punch spiral sleeve. The present invention eliminates the burr defects of the workpiece, eliminates the production of defective products, and fundamentally improves the quality of the product; the device has a high degree of automation, does not require manual intervention, relies entirely on the equipment to work, and avoids manual labor; the device has high operating reliability.

Description

Technical Field

[0001] The invention relates to the technical field of cold heading abrasive tools, and in particular to a cold heading die structure for removing burrs without external power. Background Art

[0002] A series of parts is a core functional part of the steering system of new energy vehicles. It is produced by cold heading process. The parts are made of aluminum alloy. When produced on the cold heading machine, at a certain intermediate station, due to the high extrusion pressure, there will be serious burrs on the edge of the parts. The burr height is about 1-2mm. This burr is not firm on the product and may fall off at subsequent stations. The burr debris that falls off gathers in the die, forming an indentation on the surface of the part, or affecting the normal size of the part, causing the part to be unqualified.

[0003] At present, for the burrs of columnar parts, some use rotary cutters to peel the burrs on the parts, which requires additional power to operate the rotary cutter. However, there is no special device on the cold heading machine for this workpiece to avoid this problem. The existing countermeasure is to select the unqualified products and scrap them. This working method is relatively simple, but it will cause many parts to be scrapped. For expensive parts, this working method will cause great economic losses. Summary of the invention

[0004] To this end, the present invention provides a cold heading die structure for removing burrs without external power, which can cut off the burrs generated on the edge of the part during the cold heading process to solve the above-mentioned problems in the prior art.

[0005] In order to achieve the above object, the present invention provides the following technical solutions:

[0006] A cold heading die structure for removing burrs without external power, comprising a male die part and a female die part, wherein the dies of the male die part and the female die part are installed on a cold heading machine, wherein the female die part is fixed and the male die part can reciprocate back and forth; the female die part comprises a female die, a burr cutter and a female die ejector rod; the male die part comprises a male die movable sleeve, a male die spiral sleeve, a male die ejector rod and a nitrogen spring;

[0007] A burr cutter is provided inside the die, the burr cutter is fixed inside the die, and the burr cutter itself cannot rotate; a die ejector rod is arranged on a side of the die and the burr cutter away from the punch portion; the die ejector rod can pass through the burr cutter and the die;

[0008] The punch movable sleeve is located inside the punch spiral sleeve, and the punch spiral sleeve is used to fix the punch movable sleeve and allow the punch movable sleeve to rotate at the same time; a plurality of nitrogen springs are evenly distributed inside the punch spiral sleeve, one end of the nitrogen spring is in contact with the punch movable sleeve, and a movable punch ejector rod is also provided inside the punch movable sleeve and the punch spiral sleeve; the plurality of nitrogen springs are evenly distributed in a circle around the punch ejector rod.

[0009] Further: the die comprises a die body, a cutter mounting hole and a workpiece through hole; a cutter mounting hole is provided at one end of the die body, a workpiece through hole is provided at the axis of the die body, and the workpiece through hole is connected to the cutter mounting hole.

[0010] Further: the punch movable sleeve includes a movable sleeve body, a protrusion, a limit block and an end groove; two protrusions are provided on the outer wall of one end of the movable sleeve body, the two protrusions are symmetrically arranged, and a limit block is provided at the end of the movable sleeve body away from the protrusion; a first ejector rod through hole is provided at the axis of the movable sleeve body, and an end groove is provided at the end of the movable sleeve body close to the protrusion, and the end groove is connected to the first ejector rod through hole; the end groove is a conical groove; the punch ejector rod can pass through the first ejector rod through hole.

[0011] Furthermore: the protrusion has a smooth surface and is made of wear-resistant material.

[0012] Further: the male mold spiral sleeve includes a spiral sleeve body and a double spiral groove; the interior of the spiral sleeve body is provided with a stepped through hole, one end of the spiral sleeve body is provided with a double spiral groove, and the surface of the double spiral groove is smooth; the double spiral groove can be used in conjunction with the protrusion.

[0013] Further: the burr cutter includes a cutter body, a conical groove, a groove and a second ejector rod through hole, the second ejector rod through hole is located at the axis of the cutter body, the conical groove is connected to the second ejector rod through hole, and a plurality of grooves are provided on the circumferential side of the conical groove, and the grooves pass through the cutter body.

[0014] Further: the cutter body is made of high-speed steel, and the edge of the groove is sharp.

[0015] Furthermore: a blowing hole is also provided inside the die, and the blowing hole is connected to the through hole of the workpiece; one end of the blowing hole away from the through hole of the workpiece is connected to a threaded hole, and the threaded hole can be connected to install a compressed air pipe; a plurality of blowing holes are provided.

[0016] Further: the die part also includes a negative pressure suction hood, which is mounted on the die through screws, and the negative pressure suction hood can press the edge of the burr cutter.

[0017] Furthermore: the negative pressure air suction hood includes an air suction hood body, a flange mounting plate, an air suction chamber and an exhaust connecting pipe; an air suction chamber is provided inside the air suction hood body, and the air suction chamber is connected to the exhaust connecting pipe; a flange mounting plate is provided on the opening side of the air suction hood body, and a fixed connecting hole is provided on the flange mounting plate; a third ejector rod through hole is provided on the top of the air suction hood body.

[0018] The present invention has the following advantages: after adopting the device, the burr defects of the workpiece are eliminated, the generation of defective products is prevented, and the quality of the product is fundamentally improved; the device has a high degree of automation, does not require human intervention, and relies entirely on the equipment to work, avoiding manual labor; the operation reliability of the device is high. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a stereoscopic diagram of Example 1 of a cold heading die structure for removing burrs without external power according to the present invention.

[0020] Figure 2 for Figure 1 Rear perspective view.

[0021] Figure 3 This is a state diagram when the workpiece is entering the interior of the concave die in the cold heading die structure of the present invention.

[0022] Figure 4 for Figure 3 Schematic diagram of the cross-sectional structure of AA.

[0023] Figure 5 It is a stereoscopic diagram of the concave die in the cold heading die structure of the present invention.

[0024] Figure 6 It is a stereoscopic view of the movable sleeve of the punch in the cold heading die structure of the present invention.

[0025] Figure 7 for Figure 6 Side view of.

[0026] Figure 8 for Figure 7 Schematic diagram of the cross-sectional structure along the BB direction.

[0027] Fig. 9 It is a stereoscopic view of the punch spiral sleeve in the cold heading abrasive tool structure of the present invention.

[0028] Fig.10 It is a three-dimensional diagram of the burr cutter in the cold heading abrasive tool structure of the present invention.

[0029] Fig.11 for Fig.10 Rear view of.

[0030] Fig.12 for Fig.11Schematic diagram of the cross-sectional structure along the CC direction.

[0031] Fig.13 It is a stereoscopic diagram of embodiment 2 of the present invention.

[0032] Fig.14 This is the front view of the die in Example 2 of the present invention.

[0033] Fig.15 for Fig.14 Schematic diagram of the cross-sectional structure along the DD direction.

[0034] Fig.16 It is a schematic diagram of the installation structure of the concave die and the negative pressure suction hood in the cold heading mold structure embodiment 3 of the present invention.

[0035] Fig.17 It is a three-dimensional diagram of the negative pressure suction hood in Example 3 of the present invention.

[0036] Fig.18 It is a schematic diagram of the state in which the workpiece is being processed inside the die in the present invention.

[0037] In the figure: 1, die; 2, punch sleeve; 3, punch spiral sleeve; 4, burr cutter; 5, die ejector rod; 6, punch ejector rod; 7, nitrogen spring; 8, negative pressure suction hood; 101, die body; 102, cutter mounting hole; 103, workpiece through hole; 104, blowing hole; 105, threaded hole; 201, movable sleeve body; 202, protrusion; 203, limit stopper; 204, end groove; 205, first ejector rod through hole; 301, spiral sleeve body; 302, double spiral groove; 401, cutter body; 402, conical groove; 403, groove; 404, second ejector rod through hole; 801, flange mounting plate; 802, suction hood body; 803, suction chamber; 804, fixed connection hole; 805, exhaust connection pipe; 806, third ejector rod through hole. DETAILED DESCRIPTION

[0038] The following is a description of the implementation of the present invention by specific embodiments. People familiar with the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0039] Example 1

[0040] like Figure 1 , 2As shown, a cold heading die structure for removing burrs without external power includes a punch part and a die part. The function of the punch part is to push the workpiece into the die. The dies of the punch part and the die part are installed on a cold heading machine. The die part is fixed, and the punch part can reciprocate back and forth, and the two are used in conjunction with each other. The die part includes a die 1, a burr cutter 4 and a die ejector rod 5; the punch part includes a punch movable sleeve 2, a punch spiral sleeve 3, a punch ejector rod 6 and a nitrogen spring 7.

[0041] A burr cutter 4 is provided inside the die 1, and the burr cutter 4 is fixed inside the die 1, and the burr cutter 4 itself cannot rotate; a die ejector rod 5 is arranged on the side of the die 1 and the burr cutter 4 away from the punch part; the die ejector rod 5 can pass through the burr cutter 4 and the die 1, and the function of the die ejector rod 5 is to eject the workpiece from the die part.

[0042] like Figure 3-4 As shown, the punch movable sleeve 2 is located inside the punch spiral sleeve 3, and the punch spiral sleeve 3 is used to fix the punch movable sleeve 2 and allow the punch movable sleeve 2 to rotate; four nitrogen springs 7 are evenly distributed in the punch spiral sleeve 3, one end of the nitrogen spring 7 is in contact with the punch movable sleeve 2, and a movable punch ejector rod 6 is also provided in the punch movable sleeve 2 and the punch spiral sleeve 3; the four nitrogen springs 7 are evenly distributed in a circle around the punch ejector rod 6.

[0043] The nitrogen spring 7 provides a large elastic force, a total of about 0.8-1.2 tons of force, which can push the punch movable sleeve 2 and always squeeze the punch movable sleeve 2 within a certain range of movement.

[0044] like Figure 5 As shown, the die 1 includes a die body 101, a cutter mounting hole 102 and a workpiece through hole 103; the cutter mounting hole 102 is provided at one end of the die body 101, and a workpiece through hole 103 is provided at the axis of the die body 101, and the workpiece through hole 103 is connected to the cutter mounting hole 102.

[0045] like Figure 6-8 As shown, the punch movable sleeve 2 includes a movable sleeve body 201, a protrusion 202, a limit block 203 and an end groove 204; two protrusions 202 are provided on the outer wall of one end of the movable sleeve body 201, and the two protrusions 202 are symmetrically arranged, and a limit block 203 is provided at the end of the movable sleeve body 201 away from the protrusion 202; a first ejector rod through hole 205 is provided at the axis of the movable sleeve body 201, and an end groove 204 is provided at the end of the movable sleeve body 201 close to the protrusion 202, and the end groove 204 is connected to the first ejector rod through hole 205; the end groove 204 is a conical groove, and the end groove 204 is adapted to one end of the workpiece to be processed; the punch ejector rod 6 can pass through the first ejector rod through hole 205.

[0046] The protrusion 202 has a smooth surface and is made of wear-resistant material.

[0047] The structure of the male die spiral sleeve 3 is as follows Fig. 9 As shown, it includes a spiral sleeve body 301 and a double spiral groove 302; Figure 4 As shown, the spiral sleeve body 301 is provided with a stepped through hole inside, and one end of the spiral sleeve body 301 is provided with a double helical groove 302 , and the surface of the double helical groove 302 is smooth; the double helical groove 302 can cooperate with the protrusion 202 for use.

[0048] like Figure 10-12 As shown, the burr cutter 4 includes a cutter body 401, a conical groove 402, a groove 403 and a second ejector rod through hole 404, the second ejector rod through hole 404 is located at the axis of the cutter body 401, the conical groove 402 is connected to the second ejector rod through hole 404, and a plurality of grooves 403 are provided on the circumferential side of the conical groove 402, and the grooves 403 pass through the cutter body 401.

[0049] In this embodiment, in order to achieve the best use effect, 6 grooves 403 are evenly distributed; the cutter body 401 is made of high-speed steel and is very hard; the edge of the groove 403 is very sharp and can cut off the burrs on the edge of the workpiece it contacts.

[0050] During the operation of the cold heading machine, Fig.18 As shown, after the part completes the extrusion work at the previous station, it is clamped by the clamp from the position of the previous station to the position of the next station, located at the front end of the die part; the punch part moves from right to left as a whole, and under the action of the punch movable sleeve 2, the workpiece is pushed into the die 1 until the front edge of the workpiece contacts the burr cutter 4; the punch part continues to move to the left as a whole, and the punch movable sleeve 2 can no longer move to the left, so that under the action of the continued leftward movement of the punch part as a whole, the punch movable sleeve 2 moves to the right relative to the punch spiral sleeve 3; at this moment, the nitrogen spring 7 is under pressure and gradually contracts.

[0051] The two small protrusions on the surface of the punch spiral sleeve 3 and the punch movable sleeve 2 are always meshed together. At this moment, since the punch movable sleeve 2 moves to the right relative to the punch spiral sleeve 3, the protrusion 202 of the punch movable sleeve 2 drives the punch movable sleeve 2 to start rotating; the rotation of the punch movable sleeve 2 also drives the workpiece to rotate, and the workpiece is also subjected to axial pressure. Under this action, the edge of the workpiece will contact the burr cutter 4, and the burrs on the workpiece will be cut off and become debris.

[0052] After the burrs on the workpiece are removed, the punch part moves to the right as a whole, and the workpiece is pushed out from right to left by the die ejector rod 5 until the workpiece exits the die 1; under the action of the nitrogen spring 7, the punch movable sleeve 2 rotates in the opposite direction and returns to its original position. At this time, the clamp of the next station moves over and clamps the workpiece. The workpiece is clamped and sent away by the clamp of the next station and enters the mold of the next station for cold deformation processing.

[0053] In actual use, after adopting the mold of the present invention, the burr defects of the workpiece are eliminated, the production of unqualified products is eliminated, and the quality of the product is fundamentally improved. Secondly, the device has a high degree of automation and does not require manual intervention. It relies entirely on the equipment to work, avoiding manual labor. Furthermore, the reliability of the operation of the device is high. After being put into use, it can stably and continuously produce tens of thousands of pieces, and the actual use effect is good.

[0054] Example 2

[0055] like Figure 13-15 As shown, a cold heading die structure for removing burrs without external power includes a punch part and a die part. The function of the punch part is to push the workpiece into the die. The dies of the punch part and the die part are installed on a cold heading machine. The die part is fixed, and the punch part can reciprocate back and forth, and the two are used in conjunction with each other. The die part includes a die 1, a burr cutter 4 and a die ejector rod 5; the punch part includes a punch movable sleeve 2, a punch spiral sleeve 3, a punch ejector rod 6 and a nitrogen spring 7.

[0056] The die 1 comprises a die body 101, a cutter mounting hole 102 and a workpiece through hole 103; the cutter mounting hole 102 is provided at one end of the die body 101, and a workpiece through hole 103 is provided at the axis of the die body 101, and the workpiece through hole 103 is connected to the cutter mounting hole 102.

[0057] like Fig.15 As shown, the interior of the die 1 is also provided with a blowing hole 104, which is connected to the workpiece through hole 103; one end of the blowing hole 104 away from the workpiece through hole 103 is connected to a threaded hole 105, and the threaded hole 105 can be connected to install a compressed air pipe.

[0058] There are a plurality of air blowing holes 104, which are arranged obliquely so that the compressed gas can be blown toward one side of the cutter installation hole 102. In order to achieve the best effect, in this embodiment, three air blowing holes 104 are evenly distributed.

[0059] During use, when the workpiece is processed, compressed air is introduced into the die 1 through the threaded hole 105 and the blowing hole 104 , and the compressed air blows the aluminum burrs and chips out of the die 1 .

[0060] Example 3

[0061] like Fig.16 , 17 As shown, a cold heading die structure for removing burrs without external power includes a male die part and a female die part. The female die part includes a female die 1, a burr cutter 4, a female die ejector rod 5 and a negative pressure suction hood 8.

[0062] The negative pressure suction hood 8 is mounted on the die 1 by screws, and the negative pressure suction hood 8 can press the edge of the burr cutter 4 .

[0063] The negative pressure suction hood 8 includes a suction hood body 802, a flange mounting plate 801, a suction cavity 803 and an exhaust connecting pipe 805; the suction cavity 803 is provided inside the suction hood body 802, and the suction cavity 803 is connected to the exhaust connecting pipe 805; a flange mounting plate 801 is provided on the opening side of the suction hood body 802, and a fixed connecting hole 804 is provided on the flange mounting plate 801.

[0064] A third ejector rod through hole 806 is provided on the top of the air suction hood body 802 , and the third ejector rod through hole 806 can allow the die ejector rod 5 to pass through.

[0065] 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 cold heading die structure for removing burrs without external power, comprising a male die part and a female die part; the dies of the male die part and the female die part are installed on a cold heading machine, the female die part is fixed, and the male die part can reciprocate back and forth, characterized in that: The female mold part comprises a female mold (1), a burr cutter (4) and a female mold ejector rod (5); the male mold part comprises a male mold movable sleeve (2), a male mold spiral sleeve (3), a male mold ejector rod (6) and a nitrogen spring (7); The inside of the die (1) is provided with a burr cutter (4), which is fixed in the die (1) and cannot rotate. The die ejector rod (5) is arranged on a side of the die (1) and the burr cutter (4) away from the male die portion. The die ejector rod (5) can pass through the burr cutter (4) and the die (1). The punch movable sleeve (2) is located inside the punch spiral sleeve (3), and the punch spiral sleeve (3) is used to fix the punch movable sleeve (2) and allow the punch movable sleeve (2) to rotate; a plurality of nitrogen springs (7) are evenly distributed inside the punch spiral sleeve (3), one end of the nitrogen spring (7) is in contact with the punch movable sleeve (2), and a movable punch ejector rod (6) is also provided inside the punch movable sleeve (2) and the punch spiral sleeve (3); the plurality of nitrogen springs (7) are evenly distributed in a circle around the punch ejector rod (6); The die (1) comprises a die body (101), a cutter mounting hole (102) and a workpiece through hole (103); one end of the die body (101) is provided with a cutter mounting hole (102), the axis of the die body (101) is provided with a workpiece through hole (103), and the workpiece through hole (103) is communicated with the cutter mounting hole (102); The male mold movable sleeve (2) comprises a movable sleeve body (201), a protrusion (202), a limit stopper (203) and an end groove (204); two protrusions (202) are provided on the outer wall of one end of the movable sleeve body (201), and the two protrusions (202) are symmetrically arranged, and a limit stopper (203) is provided at one end of the movable sleeve body (201) away from the protrusion (202); a through first ejector rod through hole (205) is provided at the axis of the movable sleeve body (201), and an end groove (204) is provided at one end of the movable sleeve body (201) close to the protrusion (202), and the end groove (204) is connected to the first ejector rod through hole (205); the end groove (204) is a conical groove; the male mold ejector rod (6) can pass through the first ejector rod through hole (205).

2. A cold heading die structure for removing burrs without external power according to claim 1, characterized in that: The protrusion (202) has a smooth surface and is made of wear-resistant material.

3. The cold heading die structure for removing burrs without external power according to claim 1, characterized in that: The male mold spiral sleeve (3) comprises a spiral sleeve body (301) and a double spiral groove (302); a stepped through hole is provided inside the spiral sleeve body (301); a double spiral groove (302) is provided at one end of the spiral sleeve body (301); the surface of the double spiral groove (302) is smooth; the double spiral groove (302) can cooperate with the protrusion (202) for use.

4. The cold heading die structure for removing burrs without external power according to claim 1, characterized in that: The burr cutter (4) comprises a cutter body (401), a tapered groove (402), a groove (403) and a second ejector rod through hole (404); the second ejector rod through hole (404) is located at the axis of the cutter body (401); the tapered groove (402) is connected to the second ejector rod through hole (404); a plurality of grooves (403) are provided on the circumference of the tapered groove (402); and the grooves (403) pass through the cutter body (401).

5. A cold heading die structure for removing burrs without external power according to claim 4, characterized in that: The cutter body (401) is made of high-speed steel, and the edge of the groove (403) is sharp.

6. A cold heading die structure for removing burrs without external power according to any one of claims 1 to 5, characterized in that: The inside of the die (1) is also provided with a blowing hole (104), which is in communication with the workpiece through hole (103); one end of the blowing hole (104) away from the workpiece through hole (103) is in communication with a threaded hole (105), and the threaded hole (105) can be connected to install a compressed air pipe; a plurality of blowing holes (104) are provided.

7. A cold heading die structure for removing burrs without external power according to any one of claims 1 to 5, characterized in that: The die part also includes a negative pressure air suction hood (8), which is mounted on the die (1) via screws.

8. A cold heading die structure for removing burrs without external power according to claim 7, characterized in that: The negative pressure air suction hood (8) comprises an air suction hood body (802), a flange mounting plate (801), an air suction chamber (803) and an exhaust connection pipe (805); an air suction chamber (803) is provided inside the air suction hood body (802), and the air suction chamber (803) is communicated with the exhaust connection pipe (805); a flange mounting plate (801) is provided on the opening side of the air suction hood body (802), and a fixing connection hole (804) is provided on the flange mounting plate (801); and a third ejector rod through hole (806) is provided on the top of the air suction hood body (802).

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