CN114632836B - Titanium and titanium alloy wire film pressing method for cold heading fastener - Google Patents
Titanium and titanium alloy wire film pressing method for cold heading fastener Download PDFInfo
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- CN114632836B CN114632836B CN202210230175.6A CN202210230175A CN114632836B CN 114632836 B CN114632836 B CN 114632836B CN 202210230175 A CN202210230175 A CN 202210230175A CN 114632836 B CN114632836 B CN 114632836B
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- 229910001069 Ti alloy Inorganic materials 0.000 title claims abstract description 39
- 238000003825 pressing Methods 0.000 title claims abstract description 18
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 title claims abstract description 12
- 239000010936 titanium Substances 0.000 title claims abstract description 12
- 239000011248 coating agent Substances 0.000 claims abstract description 48
- 238000000576 coating method Methods 0.000 claims abstract description 45
- 238000010622 cold drawing Methods 0.000 claims abstract description 42
- 238000000034 method Methods 0.000 claims abstract description 41
- 239000000314 lubricant Substances 0.000 claims abstract description 29
- 238000000137 annealing Methods 0.000 claims abstract description 26
- 238000001035 drying Methods 0.000 claims abstract description 15
- 238000000227 grinding Methods 0.000 claims abstract description 10
- 229910052719 titanium Inorganic materials 0.000 claims abstract description 10
- 230000001050 lubricating effect Effects 0.000 claims description 24
- 238000002791 soaking Methods 0.000 claims description 20
- 239000000843 powder Substances 0.000 claims description 17
- 238000003756 stirring Methods 0.000 claims description 17
- CWQXQMHSOZUFJS-UHFFFAOYSA-N molybdenum disulfide Chemical compound S=[Mo]=S CWQXQMHSOZUFJS-UHFFFAOYSA-N 0.000 claims description 16
- 229910052982 molybdenum disulfide Inorganic materials 0.000 claims description 16
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 16
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 15
- 239000007788 liquid Substances 0.000 claims description 12
- 239000000344 soap Substances 0.000 claims description 12
- 238000001816 cooling Methods 0.000 claims description 8
- 238000005096 rolling process Methods 0.000 claims description 8
- 230000007547 defect Effects 0.000 claims description 6
- 238000004321 preservation Methods 0.000 claims description 6
- 239000008213 purified water Substances 0.000 claims description 6
- 238000002360 preparation method Methods 0.000 claims description 5
- 239000003344 environmental pollutant Substances 0.000 claims description 4
- 238000002156 mixing Methods 0.000 claims description 4
- 231100000719 pollutant Toxicity 0.000 claims description 4
- 238000007723 die pressing method Methods 0.000 claims description 2
- 239000000463 material Substances 0.000 claims 1
- 238000012545 processing Methods 0.000 abstract description 8
- 239000000853 adhesive Substances 0.000 abstract description 3
- 230000001070 adhesive effect Effects 0.000 abstract description 3
- 229910052751 metal Inorganic materials 0.000 abstract description 2
- 239000002184 metal Substances 0.000 abstract description 2
- -1 drying Substances 0.000 abstract 1
- 238000004519 manufacturing process Methods 0.000 description 8
- 238000005516 engineering process Methods 0.000 description 4
- 238000005461 lubrication Methods 0.000 description 4
- 238000010438 heat treatment Methods 0.000 description 3
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 2
- 239000003153 chemical reaction reagent Substances 0.000 description 2
- 238000005336 cracking Methods 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000010985 leather Substances 0.000 description 2
- 238000012797 qualification Methods 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 238000005488 sandblasting Methods 0.000 description 2
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 description 2
- 238000005507 spraying Methods 0.000 description 2
- 239000004115 Sodium Silicate Substances 0.000 description 1
- 235000015278 beef Nutrition 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 229910002804 graphite Inorganic materials 0.000 description 1
- 239000010439 graphite Substances 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 238000005498 polishing Methods 0.000 description 1
- 235000019353 potassium silicate Nutrition 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
- 239000011780 sodium chloride Substances 0.000 description 1
- 229910052911 sodium silicate Inorganic materials 0.000 description 1
- 239000003760 tallow Substances 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
- B21C37/04—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of bars or wire
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C1/00—Manufacture of metal sheets, metal wire, metal rods, metal tubes by drawing
- B21C1/02—Drawing metal wire or like flexible metallic material by drawing machines or apparatus in which the drawing action is effected by drums
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C3/00—Profiling tools for metal drawing; Combinations of dies and mandrels
- B21C3/02—Dies; Selection of material therefor; Cleaning thereof
- B21C3/08—Dies; Selection of material therefor; Cleaning thereof with section defined by rollers, balls, or the like
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C9/00—Cooling, heating or lubricating drawing material
- B21C9/02—Selection of compositions therefor
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Metal Extraction Processes (AREA)
- Forging (AREA)
Abstract
The invention relates to a titanium and titanium alloy wire film pressing method for cold heading fasteners, which belongs to the technical field of nonferrous metal processing, and adopts the process steps of rounding, peeling, grinding, annealing, cold drawing, peeling, secondary annealing, lubricant coating, drying, film pressing, lubricant coating and cold drawing, thereby realizing film pressing of titanium and titanium alloy wires for cold heading fasteners, and the produced wires have good uniformity of skin film, strong adhesive force, good lubricity, smooth surface, no adhesion to a fastener die, high dimensional accuracy and high strength, and meet the requirements of the cold heading fasteners on the size and performance of the wires.
Description
Technical Field
The invention belongs to the technical field of nonferrous metal processing, and particularly relates to a film pressing method of titanium and titanium alloy wires for cold heading fasteners.
Background
The titanium alloy fastener is a fastening connecting part widely used by aircrafts, and with the rapid development of aerospace industry, the demand for the titanium alloy fastener is continuously increased, and the requirement for the comprehensive performance of the titanium alloy fastener is also higher and higher.
In order to improve the production efficiency and quality of fasteners, research and development personnel have developed continuous upsetting fastener equipment. The device must take the wire rod of the coil as the raw material of the upsetting fastener, and the titanium alloy wire rod of the coil is easy to adhere to the die in the upsetting process of the fastener, so that the production cannot be carried out, the production efficiency is reduced, and the produced fastener has cracks, has rough surface and is easy to corrode and break; and because of adopting the upsetting processing technology, the processed wire is easy to crack, and the die is possibly scrapped when serious. In order to ensure the lubrication effect of the upsetting process, avoid upsetting cracking phenomenon, meet the performance requirement of the fastener on the titanium alloy wire, and must coat a layer of self-lubricating coating on the surface of the titanium alloy wire, thereby solving the problems of adhesion, surface crack and upsetting cracking in the processing process of the wire rod of the coil, and improving the production efficiency and the yield of the fastener.
At present, the processing technology of the lubricating coating disc wire is not perfect enough, and especially, the preparation of the fastener disc wire for cold heading is still limited by various factors, so that the requirement of mass production cannot be met. Developing a method for upsetting a lubricating coating on the surface of a titanium alloy wire becomes an important task for the developer in the technical field.
The continuous upsetting fastener device adopts the processes including hot upsetting and cold upsetting, and different requirements are set for the lubricating coating on the surface of the titanium alloy wire. The hot heading process requires that the lubricating coating cannot be decomposed and volatilized at the hot heading temperature, the cold heading process requires that the lubricating coating cannot exceed a critical thickness, and the head of the fastener can be wrinkled during cold heading, so that the product is scrapped.
The patent technology closest to the invention comprises China patent with the patent publication number of CN110976726A, namely a surface coating agent for hot heading of a titanium alloy wire and a coating method thereof. And Chinese patent publication No. CN113210448A, "a method for preparing TB9 titanium alloy wire rod with lubricating coating by cold drawing".
The Chinese patent with the patent publication number of CN110976726A discloses a surface coating agent for titanium alloy wire hot heading and a coating method thereof, and the components of the surface coating agent for titanium alloy wire hot heading comprise graphite, molybdenum disulfide, sodium silicate and beef tallow with the mass ratio of 30-50:20-40:10-20:5-10, and the surface coating agent is coated on the surface of the titanium alloy wire through the steps of stirring, grinding, dispersing, peeling and polishing the surface of the titanium alloy wire, heating, spraying, drying, cold drawing and the like, so that the friction force between the titanium alloy wire and a die during heading of a fastener can be reduced, the deformation uniformity of the wire is ensured, heading cracks are avoided, the service life of the die is prolonged, and the production efficiency is improved. The coating agent comprises molybdenum disulfide and water glass, has good high temperature resistance, does not volatilize during hot upsetting, plays a role in lubrication, but has more adhered coating agent, and the thickness of a wire coating reaches 5-10 mu m (see Chinese patent specification with patent publication number of CN 110976726A), so that the head of a processed fastener is wrinkled, and the product is scrapped. The method is not suitable for the cold heading process of the fastener because the cold heading process requires a thin wire surface coating. In addition, the coating method adopts spray coating and cold drawing processes, so that the wire coating is not uniform enough, the adhesive force is not strong, and the lubrication effect of the fastener is affected.
The Chinese patent with the publication number of CN113210448A discloses a method for preparing a TB9 titanium alloy wire rod with a lubricating coating by cold drawing, which comprises the following steps: 1. solution heat treatment is carried out on the TB9 titanium alloy wire rod, and then peeling is carried out; 2. sand blasting; 3. surface pretreatment; 4. coating and drying the lubricating coating; 5. and obtaining the TB9 titanium alloy wire rod with the lubricating coating through multi-pass cold drawing. According to the invention, the solution heat treated TB9 titanium alloy wire rod is sequentially subjected to sand blasting treatment and surface pretreatment, so that a uniform and consistent crystal protection layer is attached to the surface of the solution heat treated TB9 titanium alloy wire rod, the lubricating coating is promoted to be more uniformly and stably attached to the surface of the TB9 titanium alloy wire rod, and the attaching uniformity and stability of the lubricating coating are further improved by combining a cold drawing process. Preparing the TB9 titanium alloy disc wire with the lubricating coating in a disc state. The method has the advantages that the process steps are more, the surface pretreatment is needed to be carried out on the TB9 titanium alloy wire rod subjected to solution heat treatment, the pretreatment reagent contains more components, the reagent contains NaCl, KCl, na CO 3 and the like, the environment is polluted, and the cost is increased; the crystal grains of the wire are elongated by multi-pass cold drawing, the stress is increased, scratches are generated on the surface of the wire, the lubrication performance is poor when the wire is used for cold heading fasteners, the wire is difficult to process and easy to crack when being used as the raw material of the cold heading fasteners, and the produced fasteners are rough in surface and do not meet the quality requirements of the fasteners.
Disclosure of Invention
The invention aims to solve the problems that wires are easy to adhere to a die and the head of a processed fastener is wrinkled and surface scratches are caused during cold heading processing of the fastener, and improve the processing production efficiency and the product qualification rate.
The invention aims at realizing the following technical scheme: a method for pressing a titanium and titanium alloy wire for a cold heading fastener is characterized by comprising the following steps:
A. rounding and peeling: rounding the rolled disc, and peeling the rounded wire by adopting a hole die to remove surface pollutants and an oxide layer;
B. grinding and annealing: grinding the disc wire rod after the step A is completed, and then annealing to eliminate stress;
C. cold drawing: and (3) carrying out cold drawing on the wire rod of the coil after the step B is completed:
D. peeling: peeling the wire rod of the disc coil after the step C is completed, removing defects generated on the surface of the wire rod of the disc in the cold drawing process;
E. secondary annealing: d, carrying out secondary annealing on the wire rod of the disc coil after the step D is finished, improving a metallographic structure and ensuring mechanical properties; forming an oxide film, so that the lubricant can be coated on the surface of the wire, and laying a foundation for finishing the drawing process;
F. coating lubricant and drying: putting the wire rod annealed in the step E into a soaking solution, coating a lubricant, and then drying;
H. film pressing, lubricant coating and cold drawing: and (3) carrying out horizontal and vertical rolling on the dried disc wire rod after the step F, then coating a lubricant, and finally carrying out cold drawing die pressing to form a coating film on the surface of the wire rod.
Preferably, the method is characterized in that,
the diameter reduction amount of the skinning in the step A is 1 mm-2 mm; the annealing temperature in the step B is as follows: air cooling after heat preservation for 10min to 40min at 650 ℃ to 750 ℃; c, carrying out cold drawing for 4-5 times, wherein the diameter reduction of each cold drawing is 0.3-0.5 mm; the peeling thickness in the step D is 0.2-0.3mm; and E, the secondary annealing temperature in the step is 650-750 ℃, and the temperature is kept for 30-60 minutes.
Preferably, the method is characterized in that,
the lubricant in the step F is prepared into soaking lubricating liquid, and the soaking lubricating liquid comprises, by weight, 10-14 parts of graphite powder, 8-12 parts of soap powder, 2-5 parts of molybdenum disulfide and 20-28 parts of water; the preparation steps of the soaking lubricating liquid are as follows: (1) pouring water with the temperature of 60-75 ℃ into a stirrer, pouring graphite powder, soap powder and molybdenum disulfide into purified water in the stirrer, stirring until the graphite powder, the soap powder and the molybdenum disulfide are fused, wherein the stirring speed of the stirrer is 300-500r/min, and the stirring time is 15-30min; (2) after stirring, soaking the wires in a container filled with the blending solution for 3-8min; the drying temperature is 120-150 ℃, and after 10-20min of heat preservation, air cooling is carried out;
preferably, the method is characterized in that,
the film pressing step G is to roll the disc-shaped wire rod dried in the step F through 6-10 groups of roller dies, wherein 3-5 groups of horizontal roller dies and 3-5 groups of vertical roller dies are performed alternately, and the total diameter reduction is 0.2-0.5mm, so that a film is formed on the surface of the wire rod; and (3) in the step H, the cold drawing is carried out by adopting a hole die, the lubricant component dry powder in the step F is coated on the surface of the wire before drawing, then the reducing drawing is carried out, the reducing amount is 0.1-0.3mm, and finally, a film with the diameter of 1-2 mu m is uniformly formed on the surface of the wire.
The beneficial effects are that:
1. according to the method, the coating is pressed on the surface of the wire by adopting the roller die rolling, so that the formed leather film is good in uniformity and strong in adhesive force, and therefore, the lubricity is good, the fastener can smoothly pass through a die in the processing process, the fastener is not adhered, and the production efficiency of the fastener is improved;
2. the method adopts roller die rolling, the final procedure adopts hole die one-time cold drawing, before drawing, the lubricant component dry powder in the step F is coated on the surface of the wire, and then reducing drawing is carried out, so the surface of the wire is smooth, and the problem of scratch on the surface of the wire is solved;
3. the method realizes the adjustment of the thickness of the leather membrane by matching the diameter reduction of the roller die and the hole die. The total roll reduction of the roll die is large, the reduction of the cold drawing of the hole die can be small, and the thickness of the coating is thick, otherwise, the total roll reduction of the roll die is small, the reduction of the cold drawing of the hole die can be large, and the thickness of the coating is thin. The invention uses the technology of small total reducing amount of the pressing die and large reducing amount of the hole die to enable the thickness of the coating to reach 1-2 mu m, thereby overcoming the problem of wrinkling of the head part of the cold heading fastener caused by thicker coating in the prior art and improving the qualification rate of the fastener product;
4. according to the method, due to the fact that the roller dies are used for rolling in the horizontal and vertical multiple passes, the metallographic structure of the wire is compact, the cold heading fastening piece is high in strength and long in service life, and the requirements of the cold heading fastening piece on the size and performance of the titanium or titanium alloy wire can be met.
Detailed Description
Example 1
A method for pressing titanium and titanium alloy wires for cold heading fasteners comprises the following steps:
A. rounding and peeling: selecting a titanium alloy disc wire with the diameter of 10mm, rounding by adopting a hole die, and peeling the rounded wire by adopting the hole die, wherein the peeling reduction is 1mm so as to remove surface pollutants and oxide layers;
B. grinding and annealing: grinding the wire rod of the disc after the step A is finished, and annealing after eliminating surface defects to eliminate stress, wherein the annealing temperature is as follows: keeping the temperature at 650 ℃ for 10min, and then air-cooling;
C. cold drawing: carrying out cold drawing on the coiled wire rod after the step B is completed, wherein the cold drawing is carried out for 4 times, and the diameter reduction of each cold drawing is 0.3mm;
D. peeling: peeling the wire rod of the disc after the step C is completed, removing defects generated on the surface of the wire rod of the disc in the cold drawing process, wherein the peeling thickness is 0.2mm;
E. secondary annealing: d, carrying out secondary annealing on the wire rod of the disc coil after the step D is finished, improving a metallographic structure and ensuring mechanical properties; forming an oxide film, so that a lubricant can be coated on the surface of the wire, laying a foundation for finishing the drawing process, wherein the secondary annealing temperature is 650 ℃, and the temperature is kept for 30 minutes;
F. coating lubricant and drying: and E, placing the annealed wire rod in the step E into a soaking solution, coating a lubricant, and then drying. The coating lubricant is prepared into a soaking lubricating liquid, and the soaking lubricating liquid comprises 10 parts of graphite powder, 8 parts of soap powder, 2 parts of molybdenum disulfide and 20 parts of water; the granularity of the graphite powder is 3500 meshes, the purity is 99.9%, the granularity of the molybdenum disulfide is 2500 meshes, the purity is 99.5%, and the water is purified water. The preparation steps of the soaking lubricating liquid are as follows: (1) pouring water with the temperature of 60 ℃ into a stirrer, pouring graphite powder, soap powder and molybdenum disulfide into purified water in the stirrer, stirring until the graphite powder, the soap powder and the molybdenum disulfide are fused, wherein the stirring speed of the stirrer is 300r/min, and the stirring time is 15min; (2) after stirring, soaking the wires in a container filled with the blending solution for 3min; the drying temperature is 120 ℃, and after 10 minutes of heat preservation, the air cooling is carried out;
G. film pressing, lubricant coating and cold drawing: and (3) carrying out horizontal and vertical mould pressing on the dried disc wire rod after the step F, wherein 3 groups of horizontal roller press roller moulds are provided, 3 groups of vertical roller press roller moulds are provided, 2 groups of horizontal roller press roller moulds and vertical roller press roller moulds are alternately carried out, and the total diameter reduction is 0.2mm. The cold drawing is carried out by adopting a hole die, the lubricant component dry powder in the step F is coated on the surface of the wire before the drawing, then the wire is subjected to reducing drawing, the reducing amount is 0.1mm, and finally a 2 mu m coating film is uniformly formed on the surface of the wire.
Example 2
A method for pressing titanium and titanium alloy wires for cold heading fasteners comprises the following steps:
A. rounding and peeling: selecting a titanium alloy disc wire with the diameter of 12mm, rounding by adopting a hole die, and peeling the rounded wire by adopting the hole die, wherein the peeling reduction is 2mm so as to remove surface pollutants and oxide layers;
B. grinding and annealing: grinding the wire rod of the disc after the step A is finished, and annealing after eliminating surface defects to eliminate stress, wherein the annealing temperature is as follows: preserving heat at 750 ℃ for 40min, and then air-cooling;
C. cold drawing: carrying out cold drawing on the coiled wire rod after the step B is completed, wherein the cold drawing is carried out for 5 times, and the diameter reduction of each cold drawing is 0.5mm;
D. peeling: peeling the wire rod of the disc after the step C is completed, removing defects generated on the surface of the wire rod of the disc in the cold drawing process, wherein the peeling thickness is 0.3mm;
E. secondary annealing: d, carrying out secondary annealing on the wire rod of the disc coil after the step D is finished, improving a metallographic structure and ensuring mechanical properties; forming an oxide film, so that a lubricant can be coated on the surface of the wire, laying a foundation for finishing the drawing process, wherein the secondary annealing temperature is 750 ℃, and the temperature is kept for 60 minutes;
F. coating lubricant and drying: and E, placing the annealed wire rod in the step E into a soaking solution, coating a lubricant, and then drying. The coating lubricant is prepared into a soaking lubricating liquid, and the soaking lubricating liquid comprises 14 parts of graphite powder, 12 parts of soap powder, 5 parts of molybdenum disulfide and 28 parts of water; the granularity of the graphite powder is 3000 meshes, the purity is 99.9%, the granularity of the molybdenum disulfide is 2000 meshes, the purity is 99.5%, and the water is purified water. The preparation steps of the soaking lubricating liquid are as follows: (1) pouring water with the temperature of 75 ℃ into a stirrer, pouring graphite powder, soap powder and molybdenum disulfide into purified water in the stirrer, stirring until the graphite powder, the soap powder and the molybdenum disulfide are fused, wherein the stirring speed of the stirrer is 500r/min, and the stirring time is 30min; (2) after stirring, soaking the wires in a container filled with the blending solution for 8min; the drying temperature is 150 ℃, and after 20min of heat preservation, air cooling is carried out;
G. film pressing, lubricant coating and cold drawing: and (3) horizontally and vertically molding the dried disc wire after the step F, wherein 5 groups of horizontal roller molds and 5 groups of vertical roller molds are formed. 2 each, horizontal rolling and vertical rolling were alternated, with a total reduction of 0.5mm. The cold drawing is carried out by adopting a hole die, the lubricant component dry powder in the step F is coated on the surface of the wire before the drawing, then the wire is subjected to reducing drawing, the reducing amount is 0.3mm, and finally a film with the diameter of 1 mu m is uniformly formed on the surface of the wire.
Claims (3)
1. A method for pressing a titanium and titanium alloy wire for a cold heading fastener is characterized by comprising the following steps:
A. rounding and peeling: rounding the rolled disc, and peeling the rounded wire by adopting a hole die to remove surface pollutants and an oxide layer;
B. grinding and annealing: grinding the disc wire rod after the step A is completed, and then annealing to eliminate stress;
C. cold drawing: carrying out cold drawing on the wire rod of the coil after the step B is completed;
D. peeling: peeling the wire rod of the disc coil after the step C is completed, removing defects generated on the surface of the wire rod of the disc in the cold drawing process;
E. secondary annealing: the wire rod of the coil after the step D is subjected to secondary annealing, so that a metallographic structure is improved, mechanical properties are guaranteed, an oxide film is formed, a lubricant can be coated on the surface of the wire rod, and a foundation is laid for finishing a drawing process;
F. coating lubricant and drying: putting the wire rod annealed in the step E into a soaking solution, coating a lubricant, and then drying;
G. film pressing, lubricant coating and cold drawing: the dried wire rod of the disc after the step F is rolled horizontally and vertically, then is coated with lubricant, finally is subjected to cold drawing and die pressing, a coating film is formed on the surface of the wire rod, the film pressing is to roll the disc wire material dried in the step F by 6-10 groups of roll dies, wherein 3-5 groups of horizontal roll dies and 3-5 groups of vertical roll dies are used for alternately performing horizontal rolling and vertical rolling, the total diameter reduction is 0.2-0.5mm, so that a film is formed on the surface of the wire, the cold drawing is carried out by adopting a hole die, the dry powder of the lubricant component in the step F is coated on the surface of the wire before the drawing, and then the wire is subjected to one-time diameter reduction drawing, wherein the diameter reduction is 0.1-0.3mm, and the film with the diameter of 1-2 mu m is uniformly formed on the surface of the wire, so that the wire meeting the requirements on the size and the performance of the fastener is produced.
2. The method for forming a titanium and titanium alloy wire for a cold heading fastener according to claim 1, characterized in that,
the diameter reduction amount of the skinning in the step A is 1 mm-2 mm; the annealing temperature in the step B is as follows: air cooling after heat preservation for 10min to 40min at 650 ℃ to 750 ℃; c, carrying out cold drawing for 4-5 times, wherein the diameter reduction of each cold drawing is 0.3-0.5 mm; the peeling thickness in the step D is 0.2-0.3mm; and E, the secondary annealing temperature in the step is 650-750 ℃, and the temperature is kept for 30-60 minutes.
3. The method for forming a titanium and titanium alloy wire for a cold heading fastener according to claim 1, characterized in that,
the lubricant in the step F is prepared into soaking lubricating liquid, and the soaking lubricating liquid comprises, by weight, 10-14 parts of graphite powder, 8-12 parts of soap powder, 2-5 parts of molybdenum disulfide and 20-28 parts of water; the preparation steps of the soaking lubricating liquid are as follows: (1) pouring water with the temperature of 60-75 ℃ into a stirrer, pouring graphite powder, soap powder and molybdenum disulfide into purified water in the stirrer, stirring until the graphite powder, the soap powder and the molybdenum disulfide are fused, wherein the stirring speed of the stirrer is 300-500r/min, and the stirring time is 15-30min; (2) after stirring, soaking the wires in a container filled with the blending solution for 3-8min; the drying temperature is 120-150 ℃, and after 10-20min of heat preservation, the air cooling is carried out.
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| CN202210230175.6A CN114632836B (en) | 2022-03-09 | 2022-03-09 | Titanium and titanium alloy wire film pressing method for cold heading fastener |
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| CN202210230175.6A CN114632836B (en) | 2022-03-09 | 2022-03-09 | Titanium and titanium alloy wire film pressing method for cold heading fastener |
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| CN114632836B true CN114632836B (en) | 2024-03-22 |
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Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
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