Grinding and polishing method for wire-drawing hole of wire-drawing die

Abstract

According to the grinding and polishing method for the wire-drawing hole of the wire-drawing die, the inner wall of the wire-drawing hole is axially and circumferentially scoured by particle liquid containing hard particles, and the surface of the inner wall of the wire-drawing hole is rubbed by the hard particles flowing along with liquid flow. Furthermore, the particle liquid forms a columnar jet flow passing through the wire drawing hole under the action of pressure, so that the outer peripheral surface of the columnar jet flow forms axial friction with the inner wall of the wire drawing hole when passing through the wire drawing hole, and meanwhile, the inner wall of the wire drawing hole rotates on the outer peripheral surface of the columnar jet flow, so that circumferential friction is formed between the outer peripheral surface of the columnar jet flow and the inner wall of the wire drawing hole. The device has the advantages that the inner wall surface of the wire drawing hole is smooth; compared with the prior art that a core rod is powerfully pulled, inserted and polished, the core rod cannot be broken to block a hole; compared with laser polishing in the prior art, the inner wall profile of the wiredrawing hole cannot be changed due to the problem of operation precision.

Description

Technical Field

[0001] The present invention relates to a method for grinding and polishing the drawing hole of a wire drawing die, belonging to the technical field of wire drawing die processing. Background Art

[0002] A wire drawing die is used to draw or extrude metal wire products that meet the specifications and shapes. The smoothness of the drawing hole directly affects the qualification rate of the metal wire products. Generally, the diameter of the drawing hole of a wire drawing die is very small, only 4-6 mm, and the length of the hole is about 15-20 mm. The processing technology is mostly to press a drawing hole original hole slightly smaller than the specified specification on the wire drawing die first, and then grind the round hole. Due to the too small diameter of the drawing hole, it is very easy to cause the core rod to break and block the hole when using the core rod to penetrate and form. At present, microbeam laser grinding is generally used, but the requirement for operation accuracy is too high. A slight deviation will cause the shape of the inner wall of the drawing hole to change abnormally and the inner hole diameter to exceed the specified value, resulting in the scrapping of the entire wire drawing die.

[0003] Through retrieval, no technical solutions strongly related to solving the above problems have been found. Only the patent document with the application number 202311281077.6 discloses an ammonia-aluminum nitride ceramic nozzle outlet micro-hole processing and flow detection system, which includes an adapter, a detection system, and a spraying control system. The detection system and the spraying control system are connected to the adapter through a switch control device to achieve control switching. The detection system includes an ammonia gas supply device, a pressure controller for adjusting the detection pressure, and a flow meter for detecting the flow rate at the nozzle outlet. The spraying control system includes a diamond polishing liquid spraying device for finely adjusting the aperture of the polished micro-hole. The method for micro-hole processing and detection is also disclosed.

[0004] This ammonia-aluminum nitride ceramic nozzle outlet micro-hole processing and flow detection system can meet the fine adjustment processing of the micro-hole diameter and the nitrogen gas flow detection with one clamping of the product. After fine adjustment, the flow accuracy can be controlled within 1%, meeting the production requirements of stable mass production, greatly improving the processing efficiency and qualification rate, and also greatly improving the production capacity and reducing the processing cost.

[0005] Although this patent document involves fine adjustment of the micro-hole diameter, micro-hole polishing similar to the present application, and uses the same diamond polishing liquid spraying, the technical measures and principles adopted are completely different from those of the present application and cannot achieve the technical effects to be achieved by the present application. Summary of the Invention

[0006] The technical problem to be solved by the present invention is: how to reduce the grinding processing difficulty of the drawing hole and improve the qualification rate of the wire drawing die.

[0007] In view of the above problems, the technical solution proposed by the present invention is:

[0008] A method for grinding and polishing the drawing hole of a wire drawing die, which uses a particle liquid containing hard particles to axially and circumferentially flush the inner wall of the drawing hole, and the hard particles flowing with the liquid flow friction the surface of the inner wall of the drawing hole.

[0009] Further, the particle liquid is formed into a columnar jet passing through the drawing hole under the action of pressure, so that the outer peripheral surface of the columnar jet forms axial friction with the inner wall of the drawing hole when passing through the drawing hole. At the same time, the inner wall of the drawing hole rotates on the outer peripheral surface of the columnar jet, so that the outer peripheral surface of the columnar jet forms circumferential friction with the inner wall of the drawing hole.

[0010] Further, a fixture is provided, which has a rotor driven by a motor. A semi-circular clamping groove capable of clamping the wire drawing die is provided on the rotor. Tubular shafts 1 and 2 with through holes 1 and 2 are respectively provided at both ends of the rotor. The through holes 1 and 2 have the same axis line as the drawing hole of the clamped wire drawing die, and the rotor rotates around the axis line of the drawing hole.

[0011] Further, a pressure liquid flow device for forming a columnar jet of the particle liquid under the action of pressure is provided, and the pressure liquid flow device has: a pressure vessel 1 and a pressure vessel 2 that can be sealed, a pressure infusion pipe 1 and a pressure infusion pipe 2 respectively connecting the pressure vessel 1 and the pressure vessel 2, and a jet nozzle 1 with a jet hole 1 and a jet nozzle 2 with a jet hole 2 are respectively provided at the outer ends of the pressure infusion pipe 1 and the pressure infusion pipe 2. The columnar jets are alternately sprayed at the drawing hole through the jet hole 1 and the jet nozzle 1 and the jet hole 2 and the jet nozzle 2 passing through the through hole 1 and the through hole 2 respectively; the diameters of the jet hole 1 and the jet hole 2 are equal to the diameter of the drawing hole.

[0012] Further, the jet hole 1 and the jet hole 2 are respectively in press-fit butt joint with both ends of the drawing hole; the columnar jet sprayed by the jet hole 1 under the positive pressure action in the pressure vessel 1 is sucked into the pressure vessel 2 under the negative pressure action formed by the jet hole 2 in the pressure vessel 2, and the columnar jet sprayed by the jet hole 2 under the positive pressure action in the pressure vessel 2 is sucked into the pressure vessel 1 under the negative pressure action formed by the jet hole 1 in the pressure vessel 1.

[0013] Further, the jet nozzle 1 and the jet nozzle 2 are set as conical bodies made of wear-resistant materials with outer conical surfaces, and both ends of the drawing hole are respectively set as conical holes with inner conical surfaces. The above-mentioned press-fit butt joint of the jet hole 1 and the jet hole 2 with both ends of the drawing hole is to make the outer conical surfaces of the jet nozzle 1 and the jet nozzle 2 respectively in press-fit with the inner conical surfaces of the conical holes at both ends of the drawing hole, and the inner conical surface can rotate relative to the outer conical surface.

[0014] Furthermore, let the lower spaces inside pressure vessels I and II be liquid storage spaces I and II for storing particulate liquid respectively, and the upper spaces be air pressure cavities I and II respectively. A forward air duct and a reverse air duct with a forward air pump and a reverse air pump respectively are arranged between air pressure cavity I and air pressure cavity II. Under non-operating conditions, the air pressures in air pressure cavity I and air pressure cavity II are set to normal pressure consistent with the external air pressure, achieving: allowing pressure vessel I to intake air from pressure vessel II to form positive pressure and making pressure vessel II form negative pressure, and ejecting a columnar liquid flow from jet hole I; allowing pressure vessel II to intake air from pressure vessel I to form positive pressure and making pressure vessel I form negative pressure, and ejecting a columnar liquid flow from jet hole II.

[0015] Furthermore, in pressure vessels I and II, the absolute value of the negative pressure formed by one is made greater than the absolute value of the positive pressure formed by the other.

[0016] Furthermore, a dual-pressure protection and regulator for maintaining negative pressure and turning it into positive pressure is provided on pressure vessels I and II. The dual-pressure protection and regulator includes a rigid inner liner body with air-permeable holes and an elastic expansion sleeve sleeved outside the inner liner body. Air vent holes I and II are respectively arranged at the tops of pressure vessels I and II, and air vent holes I and II are respectively communicated with air pressure cavity I and air pressure cavity II. The sleeve openings of the expansion sleeves provided on pressure vessel I and the sleeve openings of the expansion sleeves provided on pressure vessel II are respectively sealed and bonded to the edges of the orifices of air vent holes I and II. When the inner cavity of the expansion sleeve forms positive pressure, the expansion sleeve is expanded, and when the inner cavity of the expansion sleeve forms negative pressure, the expansion sleeve contracts and is restricted by the inner liner body.

[0017] Furthermore, air valves I and II are respectively arranged on pressure infusion pipe I and pressure infusion pipe II. When the columnar jet starts to eject, the air valve on the negative pressure side opens first, and the air valve on the positive pressure side opens later.

[0018] Further, a connecting pipe one is arranged between the pressure infusion pipe one and the jet nozzle one, and a connecting pipe two is arranged between the pressure infusion pipe two and the jet nozzle two. Stop flanges one and two that are in threaded fit and can be adjusted in position back and forth are respectively arranged on the outer peripheries of the connecting pipe one and the connecting pipe two; the left and right ends of the fixture also respectively have a pressing clamping seat one and a pressing clamping seat two, and the pressing clamping seat one and the pressing clamping seat two respectively have a guiding hole one and a guiding hole two, and the guiding hole one and the guiding hole two are both coaxial with the through hole one and the through hole two; the connecting pipe one is located in the through hole one and the guiding hole one, the stop flange one is located between the tubular shaft one and the pressing clamping seat one, and a compression spring one that makes the outer conical surface of the jet nozzle one press against the inner conical surface of the tapered hole at one end of the wire drawing hole is sleeved on the outer periphery of the connecting pipe one between the stop flange one and the pressing clamping seat one; the connecting pipe two is located in the through hole two and the guiding hole two, the stop flange two is located between the tubular shaft two and the pressing clamping seat two, and a compression spring two that makes the outer conical surface of the jet nozzle two press against the inner conical surface of the tapered hole at the other end of the wire drawing hole is sleeved on the outer periphery of the connecting pipe two between the stop flange two and the pressing clamping seat two.

[0019] Beneficial effects:

[0020] It can use the particulate liquid to perform axial and circumferential grinding and polishing on the inner wall of the wire drawing hole, making the inner wall surface of the wire drawing hole smooth. Compared with the prior art of using a core rod to forcefully insert and draw for grinding, the core rod will not break and block the hole. Compared with the prior art of using laser grinding, the inner wall surface shape of the wire drawing hole will not change due to operation precision problems; only precise adjustment is required during assembly, and subsequent operations do not require manual precision control, thus making the operation very simple. Description of the drawings

[0021] Figure 1 It is a cross-sectional view of the fixture and the pressure liquid flow device assembled and clamping the wire drawing die. In the figure, it shows that the air valve one and the air valve two have not been opened, and neither the forward air pressure pump nor the reverse air pressure pump is turned on;

[0022] Figure 2 It is a disassembled view of the fixture and its rotor;

[0023] Figure 3 It is a three-dimensional view of the fixture and its rotor after completion of assembly;

[0024] Figure 4 It is a cross-sectional view of the wire drawing die and the jet nozzles one and two on both sides before clamping;

[0025] Figure 5 For Figure 4 Partial schematic diagram;

[0026] Figure 6 For Figure 1 Partial structural schematic diagram, which mainly shows the assembly relationship of the related components after the wire drawing die is clamped;

[0027] Figure 7 is Figure 1 a partial schematic diagram of;

[0028] Figure 8 is a sectional schematic diagram of the pressure liquid flow device and fixture assembly relationship and working principle when the wire drawing die is in the grinding condition. In the figure, it is shown that one side of the pressure vessel is under positive pressure, and a columnar jet is ejected from the jet nozzle 1. The arrow A in the figure indicates the flow direction of the particulate liquid, the arrow B indicates the rotation direction of the wire drawing die, the arrow C indicates the positive pressure direction of the air pressure, and the arrow D indicates the negative pressure direction of the air pressure. The following arrow schematics are the same;

[0029] Figure 9 is Figure 8 a partial schematic diagram of, showing the working conditions of the dual-pressure protection and regulator on the pressure vessel 1 and the dual-pressure protection and regulator on the pressure vessel 2 in the figure;

[0030] Figure 10 is Figure 8 a partial schematic diagram of, showing that the jet nozzle 1 ejects a columnar jet, and the columnar jet is inhaled by the jet nozzle 2;

[0031] Figure 11 is a sectional schematic diagram of the pressure liquid flow device and fixture assembly relationship and working principle when the wire drawing die is in the grinding condition. In the figure, it is shown that one side of the pressure vessel 2 is under positive pressure, and a columnar jet is ejected from the jet nozzle 2.

[0032] In the figure: 1. Wire drawing die; 101. Inner conical surface; 11. Wire drawing hole; 2. Fixture; 201. Base; 21. Support 1; 22. Support 2; 23. Rotor; 231. Tubular shaft 1; 2311. Through hole 1; 232. Tubular shaft 2; 2321. Through hole 2; 233. Clamping groove; 234. Bolt pin; 24. Pressing clamp seat 1; 241. Guide hole 1; 25. Pressing clamp seat 2; 251. Guide hole 2; 26. Compression spring 1; 27. Compression spring 2; 28. Gear; 29. Motor; 3. Pressure liquid flow device; 301. Outer conical surface; 31. Pressure vessel 1; 311. Air pressure cavity 1; 3111. Vent hole 1; 32. Pressure vessel 2; 321. Air pressure cavity 2; 3211. Vent hole 2; 33. Pressure liquid delivery pipe 1; 331. Connecting pipe 1; 332. Stop flange 1; 333. Air valve 1; 34. Pressure liquid delivery pipe 2; 341. Connecting pipe 2; 342. Stop flange 2; 343. Air valve 2; 35. Jet nozzle 1; 351. Jet hole 1; 36. Jet nozzle 2; 361. Jet hole 2; 37. Forward airway; 371. Forward air pressure pump; 38. Reverse airway; 381. Reverse air pressure pump; 39. Normal pressure ventilation pipe; 391. Normal pressure switch; 4. Dual-pressure protection and regulator; 41. Liner; 411. Vent hole; 42. Expansion sleeve; 5. Particulate liquid; 51. Columnar jet. Specific embodiments

[0033] The present invention will be further described below in conjunction with embodiments and the accompanying drawings:

[0034] As Figure 1 、 8 、10 show, a method for grinding and polishing the drawing hole of a wire drawing die is to axially and circumferentially flush the inner wall of the drawing hole with a particulate liquid containing hard particles, and the hard particles flowing with the liquid flow axially and circumferentially rub the inner wall surface of the drawing hole, so that the inner wall surface of the drawing hole is smooth. Compared with the prior art using a mandrel to forcibly insert and polish, the mandrel will not break and block the hole. Compared with the prior art using laser polishing, the inner wall surface shape of the drawing hole will not change due to operation accuracy problems.

[0035] The particulate liquid is a water-based liquid with high fluidity containing emery above 400 mesh.

[0036] In the above method, the particulate liquid forms a columnar jet 51 passing through the drawing hole under the action of pressure, so that the outer peripheral surface of the columnar jet 51 forms axial friction with the inner wall of the drawing hole 11 when passing through the drawing hole 11. At the same time, the inner wall of the drawing hole 11 rotates on the outer peripheral surface of the columnar jet 51, so that the outer peripheral surface of the columnar jet 51 forms circumferential friction with the inner wall of the drawing hole 11.

[0037] As Figure 2 —6 show, according to the above method, a fixture 2 is set, so that the fixture 2 has a rotor 23 driven by a motor 29. A semi-circular clamping groove 233 capable of clamping the wire drawing die 1 is arranged on the rotor 23. Tubular shafts 231 and 232 with through holes 2311 and 2321 are respectively arranged at both ends of the rotor 23. The through holes 2311 and 2321 and the drawing hole 11 of the clamped wire drawing die 1 have the same axis line, and the rotor 23 rotates around the axis line of the drawing hole 11. The through holes 2311 and 2321 are provided to enable the component forming the columnar jet 51 to extend into and approach both ends of the drawing hole 11.

[0038] To ensure that the wire drawing die 1 is firmly clamped in the semi-circular clamping groove 233 of the rotor, threaded pin holes are arranged at both ends of the rotor 23 above the opening of the clamping groove 233, and bolt pins 234 capable of pressing both ends of the wire drawing die 1 are arranged in the threaded pin holes.

[0039] The above fixture 2 also has a support 21 and a support 22 fixed on the base 201. The above rotor 23 is rotatably installed on the support 21 and the support 22 through the tubular shafts 231 and 232;

[0040] A gear 28 for driving the rotor 23 to rotate is arranged on the support 21 or the support 22. The above motor 29 is in a driving relationship with the rotor 23 through the gear 28.

[0041] As shown Figure 1 , 7 , as shown in Figure 8, a pressure liquid flow device 3 for forming a columnar jet 51 of particulate liquid under pressure is provided, and the pressure liquid flow device 3 has: a pressure vessel one 31 and a pressure vessel two 32 that can be sealed, a pressure infusion pipe one 33 and a pressure infusion pipe two 34 that are respectively connected to the pressure vessel one 31 and the pressure vessel two 32, a jet nozzle one 35 having a jet hole one 351 and a jet nozzle two 36 having a jet hole two 361 are respectively provided at the outer ends of the pressure infusion pipe one 33 and the pressure infusion pipe two 34, and the columnar jet 51 is alternately sprayed from the jet nozzle one 35 and the jet nozzle two 36 through the through hole one 2311 and the through hole two 2321 respectively to align the two ends of the wire drawing hole 11.

[0042] Preferably, the aperture diameters of the jet hole one 351 and the jet hole two 361 are equal to the aperture diameter of the wire drawing hole 11.

[0043] As shown Figure 8 , 10 , as shown in Figure 11, thus far, with the above settings made according to the above method, the columnar jet 51 of particulate liquid formed under pressure and passing through the wire drawing hole can be sprayed and formed by the jet nozzle one 35 and the jet nozzle two 36; the rotation of the inner wall of the wire drawing hole 11 on the outer peripheral surface of the columnar jet 51 can be realized by driving the rotor 23 to rotate by the motor 29 and making the wire drawing die 1 rotate following the rotor 23.

[0044] Here, the columnar jet 51 is alternately sprayed from the jet nozzle one 35 and the jet nozzle two 36 to align the two ends of the wire drawing hole 11, that is, to perform two-way alternating scouring on the inner wall of the wire drawing hole by the columnar jet 51, which can ensure the consistency of the grinding at both ends of the inner wall of the wire drawing hole 11, and is also beneficial to avoiding grinding dead corners left by a single grinding direction. For example, for the scouring and grinding of a protruding obstacle point, the scouring force of the particulate liquid on the inner wall behind the obstacle point is weakened due to being blocked by the obstacle point, while two-way alternating scouring can eliminate this grinding dead corner.

[0045] Based on the same principle, the rotation direction of the above rotor 23 will also continuously rotate forward and backward alternately during the grinding process.

[0046] As shown Figure 5 , 6As shown in FIGS. 10, further, the first jet hole 351 and the second jet hole 361 are respectively in press-fit butt joint with both ends of the wire drawing hole 11; the columnar jet 51 ejected under the positive pressure formed by the first jet hole 351 in the first pressure vessel 31 is sucked into the second pressure vessel 32 under the negative pressure formed by the second jet hole 361 in the second pressure vessel 32, and the columnar jet 51 ejected under the positive pressure formed by the second jet hole 361 in the second pressure vessel 32 is sucked into the first pressure vessel 31 under the negative pressure formed by the first jet hole 351 in the first pressure vessel 31. In this way, no matter which direction the columnar jet 51 is ejected, it is ejected under the combined action of positive pressure and negative pressure. This negative pressure can not only reduce the resistance of positive pressure ejection, but also help to basically maintain the column shape of the columnar jet 51, avoid spreading and weakening the scouring force under the internal pressure, and at the same time can also reduce the leakage of particulate liquid in the case where the first jet hole 351 and the second jet hole 361 are not tightly pressed against both ends of the wire drawing hole 11.

[0047] The first jet nozzle 35 and the second jet nozzle 36 are set as conical bodies made of wear-resistant materials with an outer conical surface 301, and both ends of the wire drawing hole 11 are respectively set as conical holes with an inner conical surface 101. The first jet hole 351 and the second jet hole 361 being respectively in press-fit butt joint with both ends of the wire drawing hole 11 means that the outer conical surfaces 301 of the first jet nozzle 35 and the second jet nozzle 36 are respectively pressed against the inner conical surfaces 101 of the conical holes at both ends of the wire drawing hole 11, and the inner conical surface 101 can rotate relative to the outer conical surface 301. In this way, under the condition that the wire drawing die 1 rotates at a high speed, good tightness is maintained between the outer conical surface 301 and the inner conical surface 101 that are pressed against each other and continuously generate relative displacement, so that the first jet hole 351, the wire drawing hole 11, and the second jet hole 361 form a relatively closed flow channel, avoiding the particulate liquid flowing at a high speed therein from flowing out between the outer conical surface 301 and the inner conical surface 101.

[0048] As Figure 2 、 4As shown in FIGS. 6, the above method further includes the following settings: a connecting pipe 331 is provided between the pressure infusion pipe 33 and the jet nozzle 35, and a connecting pipe 341 is provided between the pressure infusion pipe 34 and the jet nozzle 36. Stop flanges 332 and 342 that are threadedly engaged and can be adjusted forward and backward in position are respectively provided on the outer peripheries of the connecting pipe 331 and the connecting pipe 342. The left and right ends of the clamp 2 also respectively have a pressing clamp seat 24 and a pressing clamp seat 25. The pressing clamp seat 24 and the pressing clamp seat 25 respectively have a guide hole 241 and a guide hole 251. The guide hole 241 and the guide hole 251 are coaxial with the through hole 2311 and the through hole 2321. The connecting pipe 331 is located in the through hole 2311 and the guide hole 241. The stop flange 332 is located between the tubular shaft 231 and the pressing clamp seat 24. A first compression spring 26 that presses the outer conical surface 301 of the jet nozzle 35 against the inner conical surface 101 of the tapered hole at one end of the wire drawing hole 11 is sleeved on the outer periphery of the connecting pipe 331 between the stop flange 332 and the pressing clamp seat 24. The connecting pipe 341 is located in the through hole 2321 and the guide hole 251. The stop flange 342 is located between the tubular shaft 232 and the pressing clamp seat 25. A second compression spring 27 that presses the outer conical surface 301 of the jet nozzle 36 against the inner conical surface 101 of the tapered hole at the other end of the wire drawing hole 11 is sleeved on the outer periphery of the connecting pipe 341 between the stop flange 342 and the pressing clamp seat 25. In this way, the outer conical surfaces 301 of the jet nozzle 35 and the jet nozzle 36 can always be kept in close contact with the inner conical surfaces 101 of the tapered holes at both ends of the wire drawing hole 11, and by adjusting the stop flanges 332 and 342 forward and backward, the tightness of the contact between the outer conical surface 301 and the inner conical surface 101 can be ensured to be in a suitable state.

[0049] The pressure infusion pipe 33 and the pressure infusion pipe 34 are flexible hoses that can be bent.

[0050] As Figure 1 、 7As shown in the figure, let the lower spaces in pressure vessel 1 - 31 and pressure vessel 2 - 32 be the first liquid storage space and the second liquid storage space for storing the particulate liquid 5 respectively, and the upper spaces be the first air pressure cavity 311 and the second air pressure cavity 321 respectively. A forward air duct 37 with a forward air pump 371 and a reverse air duct 38 with a reverse air pump 381 are arranged between the first air pressure cavity 311 and the second air pressure cavity 321. Under non - operating conditions, the air pressures in the first air pressure cavity 311 and the second air pressure cavity 321 are normal pressures consistent with the external air pressure, achieving: enabling pressure vessel 1 - 31 to intake air from pressure vessel 2 - 32 to form a positive pressure, causing pressure vessel 2 - 32 to form a negative pressure, and ejecting a columnar liquid flow from the first jet hole 351; enabling pressure vessel 2 - 32 to intake air from pressure vessel 1 - 31 to form a positive pressure, causing pressure vessel 1 - 31 to form a negative pressure, and ejecting a columnar liquid flow from the second jet hole 361. In this way, only by turning on the forward air pump 371 or the reverse air pump 381 can pressure vessel 1 - 31 and pressure vessel 2 - 32 form a positive pressure and a negative pressure respectively at the same time.

[0051] Furthermore, in pressure vessel 1 - 31 and pressure vessel 2 - 32, the absolute value of the negative pressure formed by one side is greater than the absolute value of the positive pressure formed by the other side. In this way, under operating conditions, from the first jet hole 351 through the wire - drawing hole 11 to the second jet hole 361 is in a negative pressure state, further ensuring that the particulate liquid flowing at high speed inside will not flow out between the outer conical surface 301 and the inner conical surface 101.

[0052] As Figure 7 、 8 As shown in Figures 9 and 11, a dual - pressure protection and regulator 4 for maintaining negative pressure and converting it to positive pressure is arranged on pressure vessel 1 - 31 and pressure vessel 2 - 32. The dual - pressure protection and regulator 4 includes a rigid inner lining body 41 with a ventilation hole 411 and an elastic expansion sleeve 42 sleeved outside the inner lining body 41. Ventilation holes 3111 and 3211 are respectively arranged at the tops of pressure vessel 1 - 31 and pressure vessel 2 - 32. The ventilation holes 3111 and 3211 are respectively communicated with the first air pressure cavity 311 and the second air pressure cavity 321. The sleeve mouths of the expansion sleeves 42 arranged on pressure vessel 1 - 31 and the sleeve mouths of the expansion sleeves 42 arranged on pressure vessel 2 - 32 are respectively sealed and bonded to the edges of the holes of the ventilation holes 3111 and 3211. When the inner cavity of the expansion sleeve 42 forms a positive pressure, the expansion sleeve 42 is expanded, and when the inner cavity of the expansion sleeve 42 forms a negative pressure, the expansion sleeve 42 shrinks and is restricted by the inner lining body 41.

[0053] When the forward air pressure pump 371 is turned on, the pressure vessel I 31 intakes air from the pressure vessel II 32 to form a positive pressure, causing the pressure vessel II 32 to form a negative pressure. Due to the expansion sleeve 42 of the dual-pressure protection and regulation device 4 of the pressure vessel II 32 being restricted by the inner liner 41 and unable to shrink, the gas in the air pressure cavity II 321 rapidly decreases, and the negative pressure can increase normally. At the same time, since part of the gas entering the pressure vessel I 31 enters the expansion sleeve 42 and expands the expansion sleeve 42, the increase in the positive pressure of the air pressure in the air pressure cavity I 311 is reduced, thereby realizing that the absolute value of the negative pressure of the pressure vessel II 32 is greater than the absolute value of the positive pressure in the pressure vessel I 31.

[0054] Similarly, when the reverse air pressure pump 381 is turned on, the pressure vessel II 32 intakes air from the pressure vessel I 31 to form a positive pressure, causing the pressure vessel I 31 to form a negative pressure. Due to the expansion sleeve 42 of the dual-pressure protection and regulation device 4 of the pressure vessel I 31 being restricted by the inner liner 41 and unable to shrink, the gas in the air pressure cavity I 311 rapidly decreases, and the negative pressure can increase normally. At the same time, since part of the gas entering the pressure vessel II 32 enters the expansion sleeve 42 and expands the expansion sleeve 42, the increase in the positive pressure of the air pressure in the air pressure cavity II 321 is reduced, thereby realizing that the absolute value of the negative pressure in the pressure vessel I 31 is greater than the absolute value of the positive pressure in the pressure vessel II 32.

[0055] Air valves I 333 and II 343 are respectively arranged on the pressure infusion pipe I 33 and the pressure infusion pipe II 34. When the columnar jet injection starts, preferably, the air valve on the negative pressure side opens first, and the air valve on the positive pressure side opens later.

[0056] For example, when the injection starts, when the pressure vessel I 31 is at positive pressure and the pressure vessel II 32 is at negative pressure, the air valve II 343 opens first, and the air valve I 333 opens later. When the pressure vessel I 31 is at negative pressure and the pressure vessel II 32 is at positive pressure, the air valve I 333 opens first, and the air valve II 343 opens later. In this way, a negative pressure is formed in the flow path from the jet hole I 351 through the wire drawing hole 11 to the jet hole II 361 before the columnar jet 51 starts to be injected, so that the joint of the outer conical surface 301 and the inner conical surface 101 of this section of the flow path cannot leak the particulate liquid 5 outward when the injection starts.

[0057] In order to make the air pressures in the air pressure cavity I 311 and the air pressure cavity II 321 be normal pressures consistent with the external air pressure under non-operating conditions, normal pressure ventilation pipes 39 connecting the outside to the air pressure cavity I 311 and the air pressure cavity II 321 are respectively arranged on the pressure vessel I 31 and the pressure vessel II 32, and normal pressure switches 391 that can be closed under operating conditions are arranged on the normal pressure ventilation pipes 39.

[0058] The timing of the alternating injection of the first jet nozzle 35 and the second jet nozzle 36 is determined by the inventory of the particulate liquid in the respective pressure vessels, i.e., the first pressure vessel 31 and the second pressure vessel 32. When the inventory of the particulate liquid in the first pressure vessel 31 is insufficient to continue maintaining the injection of the first jet nozzle 35, the second jet nozzle 36 starts to inject. Similarly, when the inventory of the particulate liquid in the second pressure vessel 32 is insufficient to continue maintaining the injection of the second jet nozzle 36, the first jet nozzle 35 starts to inject.

[0059] All operations in the entire grinding process can be completed manually or through the setting of an intelligent control system.

[0060] As Figure 6 shown in Fig. -11, the grinding and polishing of the drawing hole 11 of the drawing die 1 includes the following steps according to the above method:

[0061] The first step: Clamp the drawing die 1. Screw the first stop flange 332 and the second stop flange 342 into the connecting pipe 331 and the connecting pipe 341 respectively towards the clamping groove 233 of the rotor, and then make the first jet nozzle 35 and the second jet nozzle 36 withdraw from the clamping groove 233 of the rotor 23 in the opposite direction. Place the drawing die 1 into the clamping groove 233, and press the drawing die 1 tightly in the clamping groove 233 by screwing in the bolt pin 234. Finally, rotate the first stop flange 332 and the second stop flange 342 in the connecting pipe 331 and the connecting pipe 341 respectively, so that the first jet nozzle 35 and the second jet nozzle 36 extend into the tapered holes at both ends of the drawing hole 11 of the drawing die 1, and make the inner tapered surface 101 press against the outer tapered surface 301.

[0062] The second step: On the premise that the first air valve 333, the second air valve 343, and the atmospheric pressure switch 391 are all closed, start the forward air pressure pump 371 to form a positive pressure in the first pressure vessel 31 and a negative pressure in the second pressure vessel 32.

[0063] The third step: When the positive pressure in the first pressure vessel 31 and the negative pressure in the second pressure vessel 32 reach the set values (at this time, the absolute value of the negative pressure is greater than the absolute value of the positive pressure), first open the second air valve 343, and then immediately open the first air valve 333 to make the first jet nozzle 35 inject a columnar jet 51.

[0064] The fourth step: Start the motor 29 to make the drawing die 1 rotate.

[0065] When the particulate liquid in the pressure vessel 1 - 31 is insufficient to maintain the continuous jetting of the jet nozzle 1 - 35, close the air valve 1 - 333, the air valve 2 - 343 and the forward air pressure pump 371, and start the reverse air pressure pump 381 to form a positive pressure in the pressure vessel 2 - 31 and a negative pressure in the pressure vessel 1 - 31. When the negative pressure in the pressure vessel 1 - 31 and the positive pressure in the pressure vessel 2 - 32 reach the set values, first open the air valve 1 - 333, and then immediately open the air valve 2 - 343 to make the jet nozzle 2 - 36 jet a columnar jet 51, thus realizing the alternate jetting of the jet nozzle 1 - 35 and the jet nozzle 2 - 36.

[0066] The above embodiments are only used to illustrate the present invention and cannot be used to limit the protection scope covered by the present invention. Without departing from the principle of the present invention, any improvement or modification made by anyone shall be regarded as falling within the protection scope of the present invention.

Claims

1. A method for grinding and polishing a wire drawing hole of a wire drawing die, characterized in that; The inner wall of the drawing hole (11) is flushed axially and circumferentially by a particle liquid containing hard particles, and the hard particles flowing with the liquid flow rub the inner wall surface of the drawing hole.

2. The method for grinding and polishing the drawing hole of a wire drawing die according to claim 1, characterized in that; The particulate liquid is formed into a columnar jet (51) passing through the drawing hole under the action of pressure, so that the outer peripheral surface of the columnar jet (51) forms axial friction with the inner wall of the drawing hole (11) when passing through the drawing hole (11). At the same time, the inner wall of the drawing hole (11) is rotated on the outer peripheral surface of the columnar jet (51), so that the outer peripheral surface of the columnar jet (51) forms circumferential friction with the inner wall of the drawing hole (11).

3. The method for grinding and polishing the drawing hole of a wire drawing die according to claim 2, characterized in that; A clamp (2) is provided, wherein the clamp (2) has a rotor (23) driven by a motor (29), a clamping groove (233) with a semi-circular cross-section capable of clamping a wire drawing die (1) is provided on the rotor (23), and a tubular shaft (231) and a tubular shaft (232) having a through hole (2311) and a through hole (2321) are provided at both ends of the rotor (23), respectively, the through hole (2311) and the through hole (2321) having the same axis as the wire drawing hole (11) of the clamped wire drawing die (1), and the rotor (23) rotates around the axis of the wire drawing hole (11).

4. The method for grinding and polishing the drawing hole of a wire drawing die according to claim 3, characterized in that; A pressure liquid flow device (3) is provided for forming a columnar jet (51) under pressure from a particle liquid, wherein the pressure liquid flow device (3) comprises: a pressure container (31) and a pressure container (32) that can be sealed, a pressure infusion pipe (33) and a pressure infusion pipe (34) that are connected to the pressure container (31) and the pressure container (32) respectively, and a pressure infusion pipe (33) and a pressure infusion pipe (34) at the outer ends of the pressure infusion pipe (33) and the pressure infusion pipe (34). A jet nozzle 1 (35) having a jet hole 1 (351) and a jet nozzle 2 (36) having a jet hole 2 (361) are separately provided, and the jet nozzle 1 (35) and the jet nozzle 2 (36) respectively pass through the through hole 1 (2311) and the through hole 2 (2321) to alternately spray columnar jets (51) toward the wire drawing hole (11); the apertures of the jet hole 1 (351) and the jet hole 2 (361) are equal to the aperture of the wire drawing hole (11).

5. The method for grinding and polishing the drawing hole of a wire drawing die according to claim 4, characterized in that: The jet hole 1 (351) and the jet hole 2 (361) are respectively pressed and docked with the two ends of the wire drawing hole (11); the columnar jet (51) ejected by the jet hole 1 (351) under the positive pressure formed in the pressure vessel 1 (31) is sucked into the pressure vessel 2 (32) by the jet hole 2 (361) under the negative pressure formed in the pressure vessel 2 (32); the columnar jet (51) ejected by the jet hole 2 (361) under the positive pressure formed in the pressure vessel 2 (32) is sucked into the pressure vessel 1 (31) by the jet hole 1 (351) under the negative pressure formed in the pressure vessel 1 (31).

6. The method for grinding and polishing the drawing hole of a wire drawing die according to claim 5, characterized in that; The jet nozzle 1 (35) and the jet nozzle 2 (36) are set as conical bodies made of wear-resistant material with outer conical surfaces (301), and the two ends of the wire drawing hole (11) are respectively set as conical holes with inner conical surfaces (101). The jet hole 1 (351) and the jet hole 2 (361) are respectively pressed against the two ends of the wire drawing hole (11) by making the outer conical surfaces (301) of the jet nozzle 1 (35) and the jet nozzle 2 (36) respectively press against the inner conical surfaces (101) of the conical holes at the two ends of the wire drawing hole (11), and making the inner conical surfaces (101) able to rotate relative to the outer conical surfaces (301).

7. The method for grinding and polishing the drawing hole of a wire drawing die according to claim 5, characterized in that: The lower spaces in the pressure container 1 (31) and the pressure container 2 (32) are respectively the liquid storage space 1 and the liquid storage space 2 for storing the microparticle liquid (5), and the upper spaces are respectively the air pressure cavity 1 (311) and the air pressure cavity 2 (321). Between the air pressure cavity 1 (311) and the air pressure cavity 2 (321), there are respectively provided an inward air passage (37) and a return air passage (38) having an inward air pressure pump (371) and a return air pressure pump (381). Under non-operating conditions, the air pressure is The air pressure of the cavity 1 (311) and the air pressure cavity 2 (321) is a normal pressure consistent with the external air pressure, so as to achieve: the pressure vessel 1 (31) takes in air from the pressure vessel 2 (32) to form a positive pressure, so that the pressure vessel 2 (32) forms a negative pressure, and a columnar liquid flow is ejected from the jet hole 1 (351); the pressure vessel 2 (32) takes in air from the pressure vessel 1 (31) to form a positive pressure, so that the pressure vessel 1 (31) forms a negative pressure, and a columnar liquid flow is ejected from the jet hole 2 (361).

8. The method for grinding and polishing the drawing hole of a wire drawing die according to claim 7, characterized in that: In pressure container 1 (31) and pressure container 2 (32), the absolute value of the negative pressure formed on one side is made greater than the absolute value of the positive pressure formed on the other side.

9. The method for grinding and polishing the drawing hole of a wire drawing die according to claim 8, characterized in that: A dual-pressure regulator (4) for maintaining negative pressure drop and positive pressure is arranged on the pressure vessel 1 (31) and the pressure vessel 2 (32). The dual-pressure regulator (4) comprises a rigid lining body (41) having a vent hole (411) and an elastic expansion sleeve (42) sleeved outside the lining body (41). A vent hole 1 (3111) and a vent hole 2 (3211) are arranged on the top of the pressure vessel 1 (31) and the pressure vessel 2 (32), respectively. The vent hole 1 (3111) and the vent hole 2 (3211) are arranged on the top of the pressure vessel 1 (31) and the pressure vessel 2 (3211). ) are respectively connected to the air pressure cavity one (311) and the air pressure cavity two (321); the sleeve opening of the expansion sleeve (42) provided on the pressure vessel one (31) and the sleeve opening of the expansion sleeve (42) provided on the pressure vessel two (32) are respectively sealed and bonded to the edges of the openings of the vent hole one (3111) and the vent hole two (3211); when a positive pressure is formed in the cavity of the expansion sleeve (42), the expansion sleeve (42) is expanded; when a negative pressure is formed in the cavity of the expansion sleeve (42), the contraction of the expansion sleeve (42) is restricted by the inner lining body (41).

10. The method for grinding and polishing the drawing hole of a wire drawing die according to claim 8 or 9, characterized in that: Air valve one (333) and air valve two (343) are respectively arranged on pressure infusion pipe one (33) and pressure infusion pipe two (34). When the columnar jet starts to be ejected, the air valve on the negative pressure side opens first, and the air valve on the positive pressure side opens later.

11. The method for grinding and polishing the drawing hole of a wire drawing die according to claim 6, characterized in that: A connecting tube 1 (331) is provided between the pressure infusion tube 1 (33) and the jet nozzle 1 (35), and a connecting tube 2 (341) is provided between the pressure infusion tube 2 (34) and the jet nozzle 2 (36). A stop flange 1 (332) and a stop flange 2 (342) which can be adjusted forward and backward by threaded fit are provided on the outer periphery of the connecting tube 1 (331) and the connecting tube 2 (341). The left and right ends of the clamp (2) are also provided with a stop flange 1 (332) and a stop flange 2 (342) which can be adjusted forward and backward respectively. The invention comprises a first pressing seat (24) and a second pressing seat (25), wherein the first pressing seat (24) and the second pressing seat (25) respectively have a first guide hole (241) and a second guide hole (251), wherein the first guide hole (241) and the second guide hole (251) are coaxial with the first through hole (2311) and the second through hole (2321); the first connecting pipe (331) is located in the first through hole (2311) and the first guide hole (241), The stop flange 1 (332) is located between the tubular shaft 1 (231) and the pressing seat 1 (24). A compression spring 1 (26) is installed on the outer periphery of the connecting tube 1 (331) between the stop flange 1 (332) and the pressing seat 1 (24) to make the outer conical surface (301) of the jet nozzle 1 (35) and the inner conical surface (101) of the conical hole at one end of the wire drawing hole (11) pressed against each other. The connecting tube 2 (341) is located between the through hole 2 (2 321) and the second guide hole (251), the second stop flange (342) is located between the second tubular shaft (232) and the second pressing seat (25), and the outer periphery of the second connecting tube (341) between the second stop flange (342) and the second pressing seat (25) is provided with a second compression spring (27) for pressing the outer conical surface (301) of the second jet nozzle (36) against the inner conical surface (101) of the conical hole at the other end of the drawing hole (11).

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