CN109482667A - A kind of preparation method of strong mechanical performance austenitic stainless steel spring silk material - Google Patents
A kind of preparation method of strong mechanical performance austenitic stainless steel spring silk material Download PDFInfo
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- CN109482667A CN109482667A CN201811511014.4A CN201811511014A CN109482667A CN 109482667 A CN109482667 A CN 109482667A CN 201811511014 A CN201811511014 A CN 201811511014A CN 109482667 A CN109482667 A CN 109482667A
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- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
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Abstract
The invention discloses a kind of preparation methods of strong mechanical performance austenitic stainless steel spring silk material, comprising the following steps: Step 1: pretreated austenitic stainless steel bar material is carried out single pass cold extrusion, obtains the bar containing mixed grain structure；Step 2: the bar described in step 1 containing mixed grain structure is carried out groove rolling, silk material blank is obtained；Step 3: silk material blank described in cold drawing step 2, obtains strong mechanical performance austenitic stainless steel spring silk material.The mixed crystal degree of austenitic stainless steel spring silk material can be improved in method of the invention, under the premise of guaranteeing austenitic stainless steel spring silk material intensity, further increases the elongation percentage of austenitic stainless steel spring silk material.
Description
Technical field
The invention belongs to technical field of metal material, and in particular to a kind of strong mechanical performance austenitic stainless steel spring silk material
Preparation method.
Background technique
Austenitic stainless steel spring silk material is smart to its processing method, material property, size as the raw material for preparing spring
Degree, surface quality and non-destructive testing have very harsh requirement.Austenitic stainless steel wires material is generally using forging, hot rolling at present
Etc. hot procedures with the preparation process that combines of stent drawing cold working process.There are following technologies for existing processing technology not
Foot: requirement of the austenitic stainless steel wires material to mechanical property is stringent, and the silk material of 2.0mm is less than for outer diameter, and tensile strength is logical
It is often 1695MPa~2500MPa, to reach the cold deformation that intensity requirement generally requires 80%~90%, and meanwhile it is adjoint
The rapid decline of silk material elongation percentage, generally below 5%.It is lower that austenitic stainless steel wires material elongation percentage is cold worked, around spring process
Larger to mold damage, finished product spring straightness is bad, or even stainless steel silk material crack conditions occurs, therefore, is guaranteeing Ovshinsky
Its elongation percentage is further increased on the basis of body stainless steel silk material intensity, it is very necessary.
Crystallite dimension is to influence the key factor of austenitic stainless steel material mechanical property, fine crystalline metal material unit volume
Interior crystal grain quantity is more, and the material number of die that same deflection is distributed to when deforming is more, deforms more uniform, material
The hardness and plasticity of material are stronger.With going deep into for research, it has been found that relative to fine crystalline metal material, part coarse grained metal material
Higher comprehensive mechanical property is showed, there is preferable microhardness and plasticity.Mix the metal material of grain size simultaneously
Performance with fine crystalline metal material and coarse grained metal material, in recent years, about the tungsten carbide using variable grain degree
The research that mixed crystal hard alloy is produced in thickness collocation occurs, and is obtained using metal inside mixed grain structure while having good hardness
It is to solve contradiction between traditional austenitic stainless steel wires material intensity and plasticity to close with the austenitic stainless steel spring silk material of elongation percentage
The important thinking of system.
Summary of the invention
Technical problem to be solved by the present invention lies in view of the above shortcomings of the prior art, provide a kind of strong mechanical performance
The preparation method of austenitic stainless steel spring silk material, the spring silk material that this method is prepared meet ASTM A313/A in intensity
While 313M or 4357 technical conditions of GB/T require, elongation percentage is improved to 6%~11%, in the premise for guaranteeing silk material intensity
Under further improve the elongation percentage of silk material.
In order to solve the above technical problems, the technical solution adopted by the present invention is that: a kind of strong mechanical performance austenitic stainless steel
The preparation method of spring silk material, which comprises the following steps:
Step 1: pretreated austenitic stainless steel bar material is carried out single pass cold extrusion, obtain containing mixed grain structure
Bar；
Step 2: the bar described in step 1 containing mixed grain structure is carried out groove rolling, silk material blank is obtained；
Step 3: silk material blank described in cold drawing step 2, obtains strong mechanical performance austenitic stainless steel spring wire
Material.
A kind of preparation method of above-mentioned strong mechanical performance austenitic stainless steel spring silk material, which is characterized in that step 1
Described in pretreated process include that austenitic stainless steel bar material is sealed in taper copper pipe, to being sealed with austenitic stainless steel
The taper copper pipe of bar is heated；The diameter of the austenitic stainless steel bar material is 30mm~50mm.
A kind of preparation method of above-mentioned strong mechanical performance austenitic stainless steel spring silk material, which is characterized in that the cone
Shape copper pipe is that uniform internal diameter becomes wall thickness taper copper pipe, and taper is 15 °~30 °, wall thickness >=10mm；The heat treatment is to pass through induction
Coil heats, the temperature of heat treatment are 300 DEG C~400 DEG C.
A kind of preparation method of above-mentioned strong mechanical performance austenitic stainless steel spring silk material, which is characterized in that step 1
Described in the extrusion ratio of single pass cold extrusion be 14~18, the pressure of single pass cold extrusion is 1.5 × 107N~2.5 × 107N, it is single
The speed of passage cold extrusion is 3cm/s~5cm/s.
A kind of preparation method of above-mentioned strong mechanical performance austenitic stainless steel spring silk material, which is characterized in that step 2
Described in the pass deformation of groove rolling be 8%~12%, the diameter of silk material blank is 2.5mm~4.7mm.
A kind of preparation method of above-mentioned strong mechanical performance austenitic stainless steel spring silk material, which is characterized in that step 3
Described in cold drawing be by orifice type dies group carry out cold drawing, the pass deformation of cold drawing is 10%~25%；Step
The diameter of the spring silk material of strong mechanical performance austenitic stainless steel described in three is 1.0mm~1.7mm.
A kind of preparation method of above-mentioned strong mechanical performance austenitic stainless steel spring silk material, which is characterized in that the hole
Type set of molds includes the orifice type dies that pass is chamfering square, and pass is the orifice type dies of chamfering octagon, and pass is to fall
The orifice type dies of positive ten hexagon in angle, pass are circular orifice type dies.
A kind of preparation method of above-mentioned strong mechanical performance austenitic stainless steel spring silk material, which is characterized in that the height
Mechanical property austenitic stainless steel spring silk material is that intensity meets 4357 technical conditions of ASTM A313/A 313M or GB/T, is prolonged
Stretch the stainless steel spring silk material that rate is 6%~11%.
A kind of preparation method of above-mentioned strong mechanical performance austenitic stainless steel spring silk material, which is characterized in that step 2
In to containing mixed grain structure bar carry out groove rolling before further include that the bar for containing mixed grain structure is placed in turning in Centreless lathe
The bar containing mixed grain structure for being turned copper sheet is carried out solution treatment under the conditions of 950 DEG C~980 DEG C by the copper sheet for falling surface,
The time of the solution treatment≤5min.
A kind of preparation method of above-mentioned strong mechanical performance austenitic stainless steel spring silk material, which is characterized in that step 3
In further include being polished to silk material blank, stock removal≤0.1mm of polishing.
Compared with the prior art, the present invention has the following advantages:
1, the strong mechanical performance Ovshinsky that the present invention is prepared in such a way that single pass cold extrusion and cold-drawing process combine
Body stainless steel spring silk material, intensity extend while meeting the requirement of 4357 technical conditions of ASTM A313/A 313M or GB/T
Rate can be improved to 6%~11%, further improve the elongation percentage of silk material under the premise of guaranteeing silk material intensity.
2, the big processing capacity cold extrusion of single pass of the invention can obtain the bar that obvious mixed grain structure is presented, cold drawing
The deformation process of silk material cross sectional shape is square the-positive ten hexagons-circle of octagon-in the process, can be according to high mechanics
The requirement of performance austenitic stainless steel spring silk material intensity adjusts passage, increases the mixed crystal degree of silk material, improves the elongation percentage of silk material.
3, it is the copper pipe of taper as protection sleeve pipe that the present invention, which uses outer wall, is added taper copper pipe rapidly using induction coil
Heat is to 300 DEG C~400 DEG C, and internal austenitic stainless steel bar material temperature rise is smaller, far below the recrystallization temperature of copper, after pretreatment
Austenitic stainless steel bar material can directly carry out cold extrusion, save process procedure, while in Cold Extrusion Process, protection sleeve pipe it is small
Head end is introduced into extrusion die, and the resistance between extrusion process taper copper pipe and extrusion die is minimized, extrusion process bar
Acutely, the technology stability of aximal deformation value cold extrusion improves for deformation, guarantees that is squeezed goes on smoothly.
4, the present invention uses solution treatment to the bar after turning, and the temperature of solution treatment is 950 DEG C~980 DEG C, low temperature
Solution treatment is conducive to keep mixed grain structure；Using groove rolling, be conducive to the efficiency for improving rolling, while processing can be reduced
Requirement of the process to lubricity.
With reference to the accompanying drawings and examples, technical scheme of the present invention will be described in further detail.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of taper copper pipe and austenitic stainless steel bar material of the invention.
Fig. 2 is the structural schematic diagram for the orifice type dies that the pass of cold drawing of the invention is square.
Fig. 3 is that the pass of cold drawing of the invention is positive the structural schematic diagrams of octagonal orifice type dies.
Fig. 4 be cold drawing of the invention pass be positive ten hexagons orifice type dies structural schematic diagram.
Fig. 5 is the structural schematic diagram that the pass of cold drawing of the invention is circular orifice type dies.
Description of symbols
1-austenitic stainless steel bar material；2-taper copper pipes.
Specific embodiment
Embodiment 1
The preparation method of the strong mechanical performance austenitic stainless steel spring silk material of the present embodiment, comprising the following steps:
1. the pretreatment of austenitic stainless steel bar material
Such as Fig. 1, taking diameter is the austenitic stainless steel bar material 1 of 47mm, is sealed in taper copper pipe 2, and taper copper pipe 2 is etc.
Internal diameter becomes wall thickness taper copper pipe, and the material of taper copper pipe 2 is red copper, and taper is 15 °, and the wall thickness of small head end is 10mm, taper copper
The copper rod soldering and sealing of the both ends of pipe 2 is heated to 300 to the taper copper pipe 2 for being sealed with austenitic stainless steel bar material 1 by induction coil
DEG C, obtain pretreated austenitic stainless steel bar material.
2. the preparation of strong mechanical performance austenitic stainless steel spring silk material
Step 1: pretreated austenitic stainless steel bar material is carried out single pass cold extrusion, obtain containing mixed grain structure
Bar；Single pass cold extrusion is carried out to the above-mentioned taper copper pipe for being sealed with austenitic stainless steel bar material, the small head end of taper copper pipe is first
Into extrusion die, the extrusion ratio of single pass cold extrusion is 18, and the pressure of single pass cold extrusion is 1.5 × 107N, single pass are cold
The speed of extruding is 5cm/s, obtains the bar containing mixed grain structure that diameter is 11mm；
Step 2: the above-mentioned bar containing mixed grain structure to be placed in Centreless lathe to the copper sheet for being turned surface, will be turned
The bar containing mixed grain structure of copper sheet carries out solution treatment 5min under the conditions of 950 DEG C, will contain mixed grain structure after solution treatment
Bar carry out groove rolling, the pass deformation of groove rolling is 10%~12%, obtains the silk material base that diameter is 2.5mm
Material；
Step 3: polished using surface of the belt sander to silk material blank to remove surface scale, polishing
Stock removal≤0.1mm；Silk material blank after polishing is subjected to cold drawing through orifice type dies group；
The orifice type dies group of the present embodiment includes the orifice type dies that pass is chamfering square, and pass is chamfering octagon
Orifice type dies, pass be positive ten hexagon of chamfering orifice type dies, pass be circular orifice type dies；First of secondary aperture pattern
The pass of tool is chamfering square, and the pass of second time orifice type dies is chamfering octagon, third passage orifice type dies
Pass is positive ten hexagon of chamfering, and the pass of four-pass orifice type dies is circle ..., and the orifice type dies of the tenth a time are to fall
Positive ten hexagon in angle, the pass of the orifice type dies of the 12nd passage are circle；
As shown in Fig. 2~Fig. 5, during cold drawing, the section of silk material blank is from round successively by square, positive eight side
Shape, positive ten hexagon, circle, square, octagon, positive ten hexagon, circle, square, octagon, positive ten hexagon
And circle；The pass deformation of above 12 passage is followed successively by 13.88%, 14.12%, 15.19%, 15.51%, 15.80%,
14.96%, 14.98%, 14.89%, 14.68%, 12.79%, 12.01% and 11.00%, obtaining diameter is 1.0mm, tension
Intensity meets 1895Mpa≤Rm≤2095Mpa, the strong mechanical performance austenitic stainless steel spring silk material that elongation percentage is 6%.
Embodiment 2
The preparation method of the strong mechanical performance austenitic stainless steel spring silk material of the present embodiment, comprising the following steps:
1. the pretreatment of austenitic stainless steel bar material
Such as Fig. 1, taking diameter is the austenitic stainless steel bar material 1 of 50mm, is sealed in taper copper pipe 2, and taper copper pipe 2 is etc.
Internal diameter becomes wall thickness taper copper pipe, and the material of taper copper pipe 2 is red copper, and taper is 18 °, and the wall thickness of small head end is 10mm, taper copper
The copper rod soldering and sealing of the both ends of pipe 2 is heated to 300 to the taper copper pipe 2 for being sealed with austenitic stainless steel bar material 1 by induction coil
DEG C, obtain pretreated austenitic stainless steel bar material.
2. the preparation of strong mechanical performance austenitic stainless steel spring silk material
Step 1: pretreated austenitic stainless steel bar material is carried out single pass cold extrusion, obtain containing mixed grain structure
Bar；Single pass cold extrusion is carried out to the above-mentioned taper copper pipe for being sealed with austenitic stainless steel bar material, the small head end of taper copper pipe is first
Into extrusion die, the extrusion ratio of single pass cold extrusion is 17, and the pressure of single pass cold extrusion is 1.7 × 107N, single pass are cold
The speed of extruding is 5cm/s, obtains the bar containing mixed grain structure of diameter 12mm；
Step 2: the above-mentioned bar containing mixed grain structure to be placed in Centreless lathe to the copper sheet for being turned surface, will be turned
The bar containing mixed grain structure of copper sheet carries out solution treatment 5min under the conditions of 950 DEG C, will contain mixed grain structure after solution treatment
Bar carry out groove rolling, the pass deformation of groove rolling is 11%~12%, obtains the silk material base that diameter is 2.5mm
Material；
Step 3: polished using surface of the belt sander to silk material blank to remove surface scale, polishing
Stock removal≤0.1mm；Silk material blank after polishing is subjected to cold drawing through hole pattern group；
The orifice type dies group of the present embodiment includes the orifice type dies that pass is chamfering square, and pass is chamfering octagon
Orifice type dies, pass be positive ten hexagon of chamfering orifice type dies, pass be circular orifice type dies；Orifice type dies are people
Make diamond orifice type dies；The pass of first orifice type dies is chamfering square, and the square is band chamfering square,
The pass of second time orifice type dies is chamfering octagon, and the pass of third passage orifice type dies is positive ten hexagon of chamfering,
The pass of four-pass orifice type dies is circle ..., and the orifice type dies of the 7th passage are positive ten hexagon of chamfering, the 8th passage
The pass of orifice type dies is circle；
As shown in Fig. 2~Fig. 5, during cold drawing, the section of silk material blank is from round successively by square, positive eight side
Shape, positive ten hexagon, circle, square, octagon, positive ten hexagon and circle；The pass deformation of above eight passage according to
Secondary is 16.83%, 16.77%, 16.56%, 16.13%, 16.50%, 16.83%, 17.13% and 17.36%, obtains diameter
For 1.2mm, tensile strength meets 1840Mpa≤Rm≤2035Mpa, the strong mechanical performance austenitic stainless steel that elongation percentage is 6%
Spring silk material.
Embodiment 3
The preparation method of the strong mechanical performance austenitic stainless steel spring silk material of the present embodiment, comprising the following steps:
1. the pretreatment of austenitic stainless steel bar material
Such as Fig. 1, taking diameter is the austenitic stainless steel bar material 1 of 30mm, is sealed in taper copper pipe 2, and taper copper pipe 2 is etc.
Internal diameter becomes wall thickness taper copper pipe, and the material of taper copper pipe 2 is red copper, and taper is 30 °, and the wall thickness of small head end is 23mm, taper copper
The copper rod soldering and sealing of the both ends of pipe 2 is heated to 400 to the taper copper pipe 2 for being sealed with austenitic stainless steel bar material 1 by induction coil
DEG C, obtain pretreated austenitic stainless steel bar material.
2. the preparation of strong mechanical performance austenitic stainless steel spring silk material
Step 1: pretreated austenitic stainless steel bar material is carried out single pass cold extrusion, obtain containing mixed grain structure
Bar；Single pass cold extrusion is carried out to the above-mentioned taper copper pipe for being sealed with austenitic stainless steel bar material, the small head end of taper copper pipe is first
Into extrusion die, the extrusion ratio of single pass cold extrusion is 14, and the pressure of single pass cold extrusion is 2.5 × 107N, single pass are cold
The speed of extruding is 3cm/s, obtains the bar containing mixed grain structure that diameter is 8mm；
Step 2: the above-mentioned bar containing mixed grain structure to be placed in Centreless lathe to the copper sheet for being turned surface, will be turned
The bar containing mixed grain structure of copper sheet carries out solution treatment 5min under the conditions of 980 DEG C, will contain mixed grain structure after solution treatment
Bar carry out groove rolling, the pass deformation of groove rolling is 8%~9%, obtains the silk material blank that diameter is 4.7mm；
Step 3: polished using surface of the belt sander to silk material blank to remove surface scale, polishing
Stock removal≤0.1mm；Silk material blank after polishing is subjected to cold drawing through hole pattern group；
In this implementation, the orifice type dies group in cold drawing is in the same manner as in Example 1；
During cold drawing, the section deformation process of silk material blank is same as Example 1, wherein the difference is that, ten
The pass deformation of two passages is followed successively by 15.62%, 10.00%, 17%, 19.98%, 21.22%, 25.00%, 19.11%,
15.88%, 10.79%, 10.22%, 10.01% and 10.01%, obtaining diameter is 1.7mm, and tensile strength meets 1735Mpa
≤ Rm≤1935Mpa, the strong mechanical performance austenitic stainless steel spring silk material that elongation percentage is 11%.
Embodiment 4
The preparation method of the strong mechanical performance austenitic stainless steel spring silk material of the present embodiment, comprising the following steps:
1. the pretreatment of austenitic stainless steel bar material
Such as Fig. 1, taking diameter is the austenitic stainless steel bar material 1 of 35mm, is sealed in taper copper pipe 2, and taper copper pipe 2 is etc.
Internal diameter becomes wall thickness taper copper pipe, and the material of taper copper pipe 2 is red copper, and taper is 25 °, and the wall thickness of small head end is 20mm, taper copper
The copper rod soldering and sealing of the both ends of pipe 2 is heated to 380 to the taper copper pipe 2 for being sealed with austenitic stainless steel bar material 1 by induction coil
DEG C, obtain pretreated austenitic stainless steel bar material.
2. the preparation of strong mechanical performance austenitic stainless steel spring silk material
Step 1: pretreated austenitic stainless steel bar material is carried out single pass cold extrusion, obtain containing mixed grain structure
Bar；Single pass cold extrusion is carried out to the above-mentioned taper copper pipe for being sealed with austenitic stainless steel bar material, the small head end of taper copper pipe is first
Into extrusion die, the extrusion ratio of single pass cold extrusion is 15, and the pressure of single pass cold extrusion is 2.3 × 107N, single pass are cold
The speed of extruding is 3cm/s, obtains the bar containing mixed grain structure of diameter 9mm；
Step 2: the above-mentioned bar containing mixed grain structure to be placed in Centreless lathe to the copper sheet for being turned surface, will be turned
The bar containing mixed grain structure of copper sheet carries out solution treatment 5min under the conditions of 980 DEG C, will contain mixed grain structure after solution treatment
Bar carry out groove rolling, the pass deformation of groove rolling is 11.5%~12%, obtains the silk material base that diameter is 3.8mm
Material；
Step 3: polished using surface of the belt sander to silk material blank to remove surface scale, polishing
Stock removal≤0.1mm；Silk material blank after polishing is subjected to cold drawing through hole pattern group；
In this implementation, the orifice type dies group in cold drawing is in the same manner as in Example 1；
During cold drawing, the section deformation process of silk material blank is same as Example 1, wherein the difference is that, ten
The pass deformation of two passages is followed successively by 16.13%, 15.44%, 15.01%, 14.99%, 14.85%, 14.57%,
14.92%, 14.39%, 14.58%, 14.72%, 14.79% and 14.79%, obtaining diameter is 1.44mm, and tensile strength is full
Sufficient 1800Mpa≤Rm≤1990Mpa, the strong mechanical performance austenitic stainless steel spring silk material that elongation percentage is 9%.
Embodiment 5
The preparation method of the strong mechanical performance austenitic stainless steel spring silk material of the present embodiment, comprising the following steps:
1. the pretreatment of austenitic stainless steel bar material
Such as Fig. 1, taking diameter is the austenitic stainless steel bar material 1 of 50mm, is sealed in taper copper pipe 2, and taper copper pipe 2 is etc.
Internal diameter becomes wall thickness taper copper pipe, and the material of taper copper pipe 2 is red copper, and taper is 20 °, and the wall thickness of small head end is 18mm, taper copper
The copper rod soldering and sealing of the both ends of pipe 2 is heated to 350 to the taper copper pipe 2 for being sealed with austenitic stainless steel bar material 1 by induction coil
DEG C, obtain pretreated austenitic stainless steel bar material.
2. the preparation of strong mechanical performance austenitic stainless steel spring silk material
Step 1: pretreated austenitic stainless steel bar material is carried out single pass cold extrusion, obtain containing mixed grain structure
Bar；Single pass cold extrusion is carried out to the above-mentioned taper copper pipe for being sealed with austenitic stainless steel bar material, the small head end of taper copper pipe is first
Into extrusion die, the extrusion ratio of single pass cold extrusion is 15, and the pressure of single pass cold extrusion is 2.0 × 107N, single pass are cold
The speed of extruding is 4cm/s, obtains the bar containing mixed grain structure that diameter is 13mm；
Step 2: the above-mentioned bar containing mixed grain structure to be placed in Centreless lathe to the copper sheet for being turned surface, will be turned
The bar containing mixed grain structure of copper sheet carries out solution treatment 3min under the conditions of 960 DEG C, will contain mixed grain structure after solution treatment
Bar carry out groove rolling, the pass deformation of groove rolling is 11%~12%, obtains the silk material base that diameter is 4.6mm
Material；
Step 3: polished using surface of the belt sander to silk material blank to remove surface scale, polishing
Stock removal≤0.1mm；Silk material blank after polishing is subjected to cold drawing through hole pattern group；
In this implementation, the orifice type dies group in cold drawing is in the same manner as in Example 2；
During cold drawing, the section deformation process of silk material blank is same as Example 2, wherein the difference is that, eight
The pass deformation of passage is followed successively by 24.39%, 24.31%, 24.69%, 24.74%, 24.27%, 24.58%, 24.54%
With 23.95%；Obtaining diameter is 1.5mm, and tensile strength meets 1870Mpa≤Rm≤1965Mpa, the high-tensile strength that elongation percentage is 9%
Learn performance austenitic stainless steel spring silk material.
Embodiment 6
The preparation method of the strong mechanical performance austenitic stainless steel spring silk material of the present embodiment, comprising the following steps:
1. the pretreatment of austenitic stainless steel bar material
Such as Fig. 1, taking diameter is the austenitic stainless steel bar material 1 of 50mm, is sealed in taper copper pipe 2, and taper copper pipe 2 is etc.
Internal diameter becomes wall thickness taper copper pipe, and the material of taper copper pipe 2 is red copper, and taper is 28 °, and the wall thickness of small head end is 20mm, taper copper
The copper rod soldering and sealing of the both ends of pipe 2 is heated to 320 to the taper copper pipe 2 for being sealed with austenitic stainless steel bar material 1 by induction coil
DEG C, obtain pretreated austenitic stainless steel bar material.
2. the preparation of strong mechanical performance austenitic stainless steel spring silk material
Step 1: pretreated austenitic stainless steel bar material is carried out single pass cold extrusion, obtain containing mixed grain structure
Bar；Single pass cold extrusion is carried out to the above-mentioned taper copper pipe for being sealed with austenitic stainless steel bar material, the small head end of taper copper pipe is first
Into extrusion die, the extrusion ratio of single pass cold extrusion is 15, and the pressure of single pass cold extrusion is 1.8 × 107N, single pass are cold
The speed of extruding is 4cm/s, obtains the bar containing mixed grain structure of diameter 13mm；
Step 2: the above-mentioned bar containing mixed grain structure to be placed in Centreless lathe to the copper sheet for being turned surface, will be turned
The bar containing mixed grain structure of copper sheet carries out solution treatment 2min under the conditions of 960 DEG C, will contain mixed grain structure after solution treatment
Bar carry out groove rolling, the pass deformation of groove rolling is 10%~12%, obtains the silk material blank that diameter is 3mm；
Step 3: polished using surface of the belt sander to silk material blank to remove surface scale, polishing
Stock removal≤0.1mm；Silk material blank after polishing is subjected to cold drawing through hole pattern group；
In this implementation, the orifice type dies group in cold drawing is in the same manner as in Example 2；
During cold drawing, the section deformation process of silk material blank is same as Example 2, wherein the difference is that, eight
The pass deformation of passage is followed successively by 19.00%, 19.67%, 19.59%, 19.25%, 19.46%, 17.45%, 16.83%
With 17.13%, obtaining diameter is 1.32mm, and tensile strength meets 1825Mpa≤Rm≤2020Mpa, the high-tensile strength that elongation percentage is 7%
Learn performance austenitic stainless steel spring silk material.
Embodiment 7
The preparation method of the strong mechanical performance austenitic stainless steel spring silk material of the present embodiment, comprising the following steps:
1. the pretreatment of austenitic stainless steel bar material
Such as Fig. 1, taking diameter is the austenitic stainless steel bar material 1 of 50mm, is sealed in taper copper pipe 2, and taper copper pipe 2 is etc.
Internal diameter becomes wall thickness taper copper pipe, and the material of taper copper pipe 2 is red copper, and taper is 20 °, and the wall thickness of small head end is 18mm, taper copper
The copper rod soldering and sealing of the both ends of pipe 2 is heated to 350 to the taper copper pipe 2 for being sealed with austenitic stainless steel bar material 1 by induction coil
DEG C, obtain pretreated austenitic stainless steel bar material.
2. the preparation of strong mechanical performance austenitic stainless steel spring silk material
Step 1: pretreated austenitic stainless steel bar material is carried out single pass cold extrusion, obtain containing mixed grain structure
Bar；Single pass cold extrusion is carried out to the above-mentioned taper copper pipe for being sealed with austenitic stainless steel bar material, the small head end of taper copper pipe is first
Into extrusion die, the extrusion ratio of single pass cold extrusion is 16, and the pressure of single pass cold extrusion is 2.0 × 107N, single pass are cold
The speed of extruding is 4cm/s, obtains the bar containing mixed grain structure that diameter is 13mm；
Step 2: the above-mentioned bar containing mixed grain structure to be placed in Centreless lathe to the copper sheet for being turned surface, will be turned
The bar containing mixed grain structure of copper sheet carries out solution treatment 3min under the conditions of 960 DEG C, will contain mixed grain structure after solution treatment
Bar carry out groove rolling, the pass deformation of groove rolling is 11%~12%, obtains the silk material base that diameter is 4.6mm
Material；
Step 3: polished using surface of the belt sander to silk material blank to remove surface scale, polishing
Stock removal≤0.1mm；Silk material blank after polishing is subjected to cold drawing through hole pattern group；
The orifice type dies group of the present embodiment includes the orifice type dies that pass is chamfering square, and pass is chamfering octagon
Orifice type dies, pass be positive ten hexagon of chamfering orifice type dies, pass be circular orifice type dies；Orifice type dies are people
Make diamond orifice type dies；The pass of first orifice type dies is chamfering square, and the square is band chamfering square,
The pass of second time orifice type dies is chamfering octagon, and the pass of third passage orifice type dies is positive ten hexagon of chamfering,
The pass of four-pass orifice type dies is circle ..., and the orifice type dies of the 8th passage are circle, the orifice type dies of the 9th passage
Pass is circle；
As shown in Fig. 2~Fig. 5, during cold drawing, the section of silk material blank is from round successively by square, positive eight side
Shape, positive ten hexagon, circle, square, octagon, positive ten hexagon, circle and circle；The passage of above nine passage deforms
Amount is followed successively by 24.01%, 24.25%, 23.63%, 23.37%, 24.50%, 21.16%, 23.65%, 20.99% and
23.44%；Obtaining diameter is 1.4mm, and tensile strength meets 1800Mpa≤Rm≤1990Mpa, the high-tensile strength that elongation percentage is 7.5%
Learn performance austenitic stainless steel spring silk material.
The above is only presently preferred embodiments of the present invention, not does any restrictions to the present invention, all according to invention skill
Art any simple modification substantially to the above embodiments, change and equivalent structural changes, still fall within the technology of the present invention
In the protection scope of scheme.
Claims (10)
1. a kind of preparation method of strong mechanical performance austenitic stainless steel spring silk material, which comprises the following steps:
Step 1: pretreated austenitic stainless steel bar material is carried out single pass cold extrusion, the bar containing mixed grain structure is obtained；
Step 2: the bar described in step 1 containing mixed grain structure is carried out groove rolling, silk material blank is obtained；
Step 3: silk material blank described in cold drawing step 2, obtains strong mechanical performance austenitic stainless steel spring silk material.
2. a kind of preparation method of strong mechanical performance austenitic stainless steel spring silk material according to claim 1, feature
It is, pretreated process described in step 1 includes that austenitic stainless steel bar material is sealed in taper copper pipe, to being sealed with
The taper copper pipe of austenitic stainless steel bar material is heated；The diameter of the austenitic stainless steel bar material be 30mm~
50mm。
3. a kind of preparation method of strong mechanical performance austenitic stainless steel spring silk material according to claim 2, feature
It is, the taper copper pipe is that uniform internal diameter becomes wall thickness taper copper pipe, and taper is 15 °~30 °, wall thickness >=10mm；At the heating
For reason to be heated by induction coil, the temperature of heat treatment is 300 DEG C~400 DEG C.
4. a kind of preparation method of strong mechanical performance austenitic stainless steel spring silk material according to claim 1,2 or 3,
It being characterized in that, the extrusion ratio of single pass cold extrusion described in step 1 is 14~18, the pressure of single pass cold extrusion is 1.5 ×
107N~2.5 × 107N, the speed of single pass cold extrusion are 3cm/s~5cm/s.
5. a kind of preparation method of strong mechanical performance austenitic stainless steel spring silk material according to claim 1,2 or 3,
Be characterized in that, the pass deformation of groove rolling described in step 2 is 8%~12%, the diameter of silk material blank be 2.5mm~
4.7mm。
6. a kind of preparation method of strong mechanical performance austenitic stainless steel spring silk material according to claim 1,2 or 3,
It is characterized in that, cold drawing described in step 3 is to carry out cold drawing by orifice type dies group, and the pass deformation of cold drawing is
10%~25%；The diameter of the spring silk material of strong mechanical performance austenitic stainless steel described in step 3 is 1.0mm~1.7mm.
7. a kind of preparation method of strong mechanical performance austenitic stainless steel spring silk material according to claim 6, feature
It is, the orifice type dies group includes the orifice type dies that pass is chamfering square, and pass is the hole pattern of chamfering octagon
Tool, pass are the orifice type dies of positive ten hexagon of chamfering, and pass is circular orifice type dies.
8. a kind of preparation method of strong mechanical performance austenitic stainless steel spring silk material according to claim 1,2 or 3,
It is characterized in that, the strong mechanical performance austenitic stainless steel spring silk material is that intensity meets ASTM A313/A 313M or GB/T
4357 technical conditions, the stainless steel spring silk material that elongation percentage is 6%~11%.
9. a kind of preparation method of strong mechanical performance austenitic stainless steel spring silk material according to claim 2 or 3, special
Sign is, further includes that the bar for containing mixed grain structure is placed in nothing before carrying out groove rolling to the bar containing mixed grain structure in step 2
The copper sheet on surface is turned in heart lathe, will be turned the bar containing mixed grain structure of copper sheet under the conditions of 950 DEG C~980 DEG C into
Row solution treatment, time≤5min of the solution treatment.
10. a kind of preparation method of strong mechanical performance austenitic stainless steel spring silk material according to claim 1,2 or 3,
It is characterized in that, further include being polished to silk material blank in step 3, stock removal≤0.1mm of polishing.
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| CN110479790A (en) * | 2019-09-10 | 2019-11-22 | 上海群力紧固件制造有限公司 | A kind of bar manufacturing process for fastener |
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| CN109482667B (en) | 2019-12-03 |
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