CN102814436B - Method for performing roll forming on screw thread by medium-high frequency induction heating and axial feed - Google Patents

Method for performing roll forming on screw thread by medium-high frequency induction heating and axial feed Download PDF

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CN102814436B
CN102814436B CN201210303574.7A CN201210303574A CN102814436B CN 102814436 B CN102814436 B CN 102814436B CN 201210303574 A CN201210303574 A CN 201210303574A CN 102814436 B CN102814436 B CN 102814436B
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rolling die
frequency induction
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张大伟
赵升吨
李泳峄
范淑琴
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Shaanxi Gezhi Jingcheng Intelligent Manufacturing Co ltd
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Xian Jiaotong University
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Abstract

The invention discloses a method for performing roll forming a screw thread by medium-high frequency induction heating and axial feed. The method comprises the following steps of: firstly, clamping a workpiece; heating the surface of the end part area of a shaped screw thread section on the workpiece; performing the roll forming on the firstly heated section by roll forming dies, wherein the lead angle of the surface of each roll forming die is different from that of the screw thread of the workpiece to be rolled; performing the roll forming to enable the workpiece to do an axial feed motion; after the axial feed and the roll forming are started, enabling the workpiece to enter a forming area of a medium-high frequency induction heater under the axial feed motion of the workpiece and performing continuous heating to complete the roll forming on the screw thread on the workpiece by the roll forming dies, wherein the medium-high frequency induction heater is located between each roll forming die and a workpiece clamping position, and the medium-high frequency induction heater is only used for heating a plastically deforming surface local area in part of the forming area being about to deform by rolling. The method for performing the roll forming the screw thread by the medium-high frequency induction heating and the axial feed has the advantages that the forming force of the screw thread is small; the heat loss is low; and energy is saved.

Description

A kind of method of medium-high frequency eddy-current heating axial feed rollforming screw element
Technical field
The invention belongs to advanced material forming technique field, be specifically related to a kind of method of medium-high frequency eddy-current heating axial feed rollforming screw element.
Background technology
Screw element is connection and driving parts crucial in machinery manufacturing industry, and at space flight machinery, lathe, instrument and meter, automobile and the application of various vehicle are very extensive.Conventionally, need the part of machining screw to account for the more than 60% of machine part quantity.
The processing of thread part, the problem such as ubiquity labour intensity is large, production efficiency is low, cost is high and Product Precision is low.Along with developing rapidly of Aeronautics and Astronautics, automobile and mechanical industry, the demand of all kinds of thread parts increases day by day, constantly appears at the demand of working under high speed, large load, moving load condition, and intensity, the precision of this double thread part are had higher requirement.Traditional cutting working method not only efficiency is low, and owing to cutting off metallic fiber, has reduced the quality of part, is difficult to be suitable for this needs.Thread rolling processing method be a kind of high-quality, efficiently, advanced chipless process cheaply, the accurate thread part that high efficiency and high-mechanical property are required, demonstrates great superiority.But current screw thread cold rolling method has strict requirement to moulding material hardness and percentage elongation, be difficult to moulding material hardness and be greater than the screw element that HRC37, percentage elongation are less than 8%; Material for material percentage elongation between 8% ~ 12%, is difficult to into the high-quality screw element of rollforming.And for the large material of resistance of deformation under room temperature, not only shaping load is large for its screw thread cold rolling shaping process, material flow difficulties, and former transmission system and integral rigidity also face great challenge.
Warm working has been concentrated the advantage of cold forming and heat forming technology, not only can effectively reduce resistance of deformation, reduce material hardness, improves metal material plastic forming ability; And avoided hot forming energy consumption large, easily produced overheated, oxidation, decarburization, and the shortcoming such as allowance is large; Can obtain good product surface quality and higher dimensional accuracy.At present, due to the plurality of advantages of warm working, numerous scholars have carried out research widely to this technique, be applied to a lot of production occasions and obtained satisfied effect, such as warm drawing and forming, warm-extrusion forming, Warm forging precise forming etc., but also Warm Forming Technology is not applied in the plastic working technique of axial feed rollforming screw element.
Summary of the invention
In order to overcome the shortcoming of above-mentioned prior art, the object of the present invention is to provide a kind of method of medium-high frequency eddy-current heating axial feed rollforming screw element, screw element shaping load is little, material flowability can be good, can rapidoprint resistance of deformation large, hardness is large and thin and long shafts screw element, has advantages of that forming accuracy and surface quality are high, production efficiency is high, the range of work is wide, highly versatile.
In order to achieve the above object, the technical scheme that the present invention takes is:
A method for medium-high frequency eddy-current heating axial feed rollforming screw element, comprises the steps:
Step 1, clamping workpiece 2, workpiece 2 by front top 1 and back centre 3 clamp, the axis that makes workpiece 2 is with the axis of two rolling dies 5 in same level, two rolling die 5 axis are parallel, are symmetrically distributed in workpiece 2 both sides;
Step 2, the thread segment end regions surface local that is shaped on workpiece 2 heating, is specially:
2.1, workpiece 2 is to rolling die 5 direction feedings, the thread segment that is shaped on workpiece 2 enters in medium-high frequency induction heater 4, medium-high frequency induction heater 4 is configured between rolling die 5 and workpiece 2 clamping positions, the thread segment that is shaped on workpiece 2 aligns near rolling die 5 one end with medium-high frequency induction heater 4 near rolling die 5 one end
Hot zone length is that the length of medium-high frequency induction heater 4 bringing-up section a is L a, medium-high frequency induction heater 4 is L near rolling die 5 one end with the length of space section b between adjacent rolling die 5 end faces b, the length of rolling die 5 squeezing thread section c is L c, length L al band L cmeet formula L a=L b<L c(1);
2.2, medium-high frequency induction heater 4 is started working, and the surface heating layer depth Δ of thread segment in bringing-up section a that be shaped on workpiece 2 should meet formula &Delta; = d Z - d 1 + ( 1.5 ~ 2.5 ) ( d - d 1 ) 2 ;
In formula: d zfor blank diameter before the rolling of blank threaded portion; d 1for shaping screw thread path; D is shaping Major Diam;
2.3, in bringing-up section a, the temperature in the surface heating layer depth Δ of workpiece reaches predetermined forming temperature T, and its heat time is t,
Forming temperature T is more than deformable material blue shortness district temperature, fully carries out the warm working temperature below the temperature of recrystallization; Or the hot forming temperature more than the temperature of fully carrying out recrystallization; Heat time t determines that the method for the shortest heat time is determined when adopting electromagnetic induction heating in forging, and wherein in bringing-up section a, workpiece centre temperature and the poor Δ T of surface layer temperatures select in 200 ℃ ~ (T-50 ℃) scope;
Step 3, workpiece 2 bringing-up section enters space section b between medium-high frequency induction heater 4 and rolling die 5,
Workpiece 2 bringing-up section aligns with rolling die 5 end faces near rolling die 5 one end;
Step 4, continuous medium-high frequency eddy-current heating and axial feed, completed the rollforming of screw thread on workpiece 2 by rolling die 5,
When the thread segment that is shaped on workpiece 2 all departs from after medium-high frequency induction heater 4, medium-high frequency induction heater 4 quits work; Two synchronous rotating in same directions of rolling die 5, two rolling dies 5 are made radial feed simultaneously, and in the time that rolling die 5 completes radially total feed amount S, rolling die 5 stops radial feed, only rotates;
Surface heating layer depth Δ in bringing-up section a should meet formula workpiece 2 axial feed velocity v ashould meet formula v a = &Delta;L t ;
In formula: Δ L is that workpiece 2 often turns axial feeding, Δ L is determined by difference and rolling die 5 rotating speeds of the lead angle on rolling die 5 surfaces and the lead angle of the screw element that is formed, rolling die 5 radial feed speed υ rshould meet formula
Figure BDA00002051474700043
Step 5, workpiece 2 by front top 1 and back centre 3 clamp and oppositely exit simultaneously, discharging.
The present invention organically combines medium-high frequency eddy-current heating and axial feed rollforming screw thread, realizes the long screw element of axial feed rollforming high strength, high hardness material; Medium-high frequency induction heater, between rollforming mould and clamping workpiece position, only heats the partially-formed region that is about to beginning rolling distortion; Rollforming die surface lead angle is with the screw element lead angle difference that is rolled part, rollforming workpiece axial feed; Under workpiece axial feed motion, enter the shaped region laser heating of medium-high frequency induction heater; Only to there is the surface local region heating of plastic deformation in medium-high frequency induction heater; Reduce thermal loss, save the energy; Can reduce material deformation drag, improve metal plastic deformation ability; Machinable material resistance of deformation is large, hardness large and thin and long shafts screw element.
Accompanying drawing explanation
Fig. 1 is flow chart of the present invention.
Fig. 2 is equipment therefor connection diagram of the present invention.
Fig. 3 is the front view in medium-high frequency induction heater of the present invention and rolling die region.
Fig. 4 is workpiece 2 of the present invention and rolling die 5 layouts and motion signal.
The specific embodiment
Below in conjunction with drawings and Examples, the present invention is described in detail.
Embodiment
It is 42CrMo high strength steel that the present embodiment adopts the material of workpiece 2, and the yield strength under 25 ° of C of room temperature is 1320MPa, and tensile strength is 1510MPa.
With reference to Fig. 1, a kind of method of medium-high frequency eddy-current heating axial feed rollforming screw element, comprises the steps:
Step 1, clamping workpiece 2, workpiece 2 by front top 1 and back centre 3 clamp, the axis that makes workpiece 2 is with the axis of two rolling dies 5 in same level, two rolling die 5 axis are parallel, are symmetrically distributed in workpiece 2 both sides;
Step 2, the thread segment end regions surface local that is shaped on workpiece 2 heating, is specially:
2.1, workpiece 2 is to rolling die 5 direction feedings, the thread segment that is shaped on workpiece 2 enters in medium-high frequency induction heater 4, with reference to Fig. 2, medium-high frequency induction heater 4 is configured between rolling die 5 and workpiece 2 clamping positions, the thread segment that is shaped on workpiece 2 aligns near rolling die 5 one end with medium-high frequency induction heater 4 near rolling die 5 one end
With reference to Fig. 3, hot zone length is that the length of medium-high frequency induction heater 4 bringing-up section a is L a, medium-high frequency induction heater 4 is L near rolling die 5 one end with the length of space section b between adjacent rolling die 5 end faces b, the length of rolling die 5 squeezing thread section c is L c, length L a, L band L cmeet formula L a=L b<L c;
2.2, medium-high frequency induction heater is started working; The surface heating layer depth Δ of thread segment in bringing-up section a that be shaped on workpiece should meet formula
Figure BDA00002051474700061
In formula: d z, blank diameter before the rolling of blank threaded portion; d 1, shaping screw thread path; D, shaping Major Diam;
2.3, in bringing-up section a, the temperature in the surface heating layer depth Δ of workpiece reaches predetermined forming temperature T, and its heat time is t,
Forming temperature T is more than deformable material blue shortness district temperature, fully carries out the warm working temperature below the temperature of recrystallization, is specially 700 ℃; Heat time t determines that the method for the shortest heat time is determined when adopting electromagnetic induction heating in forging, and wherein in bringing-up section a, workpiece centre temperature and the poor Δ T of surface layer temperatures select within the scope of 200 ℃ ~ 650 ℃;
Step 3, workpiece 2 bringing-up section enters space section b between medium-high frequency induction heater 4 and rolling die 5,
Workpiece 2 bringing-up section aligns with rolling die 5 end faces near rolling die 5 one end;
Step 4, continuous medium-high frequency eddy-current heating and axial feed, completed the rollforming of screw thread on workpiece 2 by rolling die 5,
When the thread segment that is shaped on workpiece 2 all departs from after medium-high frequency induction heater 4, medium-high frequency induction heater 4 quits work; Two synchronous rotating in same directions of rolling die 5, two rolling dies 5 are made radial feed simultaneously, and with reference to Fig. 4, in the time that rolling die 5 completes radially total feed amount S, rolling die 5 stops radial feed, only rotates;
Surface heating layer depth Δ in bringing-up section a should meet formula
Figure BDA00002051474700071
workpiece 2 axial feed velocity v ashould meet formula v a = &Delta;L t ;
In formula: Δ L is that workpiece 2 often turns axial feeding, Δ L is determined by difference and rolling die 5 rotating speeds of the lead angle on rolling die 5 surfaces and the lead angle of the screw element that is formed, rolling die 5 radial feed speed υ rshould meet formula
Step 5, workpiece 2 by front top 1 and back centre 3 clamp and oppositely exit simultaneously, discharging.

Claims (1)

1. a method for medium-high frequency eddy-current heating axial feed rollforming screw element, is characterized in that, comprises the steps:
Step 1, clamping workpiece (2), workpiece (2) is clamped by front top (1) and back centre (3), the axis that makes workpiece (2) with the axis of two rolling dies (5) in same level, two rolling dies (5) axis is parallel, is symmetrically distributed in workpiece (2) both sides;
Step 2, the upper shaping thread segment end regions surface local heating of workpiece (2), is specially:
2.1, workpiece (2) is to rolling die (5) direction feeding, the upper shaping thread segment of workpiece (2) enters in medium-high frequency induction heater (4), medium-high frequency induction heater (4) is configured between rolling die (5) and workpiece (2) clamping position, the upper shaping thread segment of workpiece (2) aligns near rolling die (5) one end with medium-high frequency induction heater (4) near rolling die (5) one end
Hot zone length is that the length of medium-high frequency induction heater (4) bringing-up section a is L a, medium-high frequency induction heater (4) is L near rolling die (5) one end with the length of space section b between adjacent rolling die (5) end face b, the length of rolling die (5) squeezing thread section c is L c, length L a, L band L cmeet formula L a=L b<L c;
2.2, medium-high frequency induction heater (4) is started working, and the surface heating layer depth Δ of the upper shaping thread segment of workpiece (2) in bringing-up section a should meet formula &Delta; = d z - d 1 + ( 1.5 ~ 2.5 ) ( d - d 1 ) 2 ;
In formula: d zfor blank diameter before the rolling of blank threaded portion; d 1for shaping screw thread path; D is shaping Major Diam;
2.3, in bringing-up section a, the temperature in the surface heating layer depth Δ of workpiece reaches predetermined forming temperature T, and its heat time is t,
Forming temperature T is more than deformable material blue shortness district temperature, fully carries out the warm working temperature below the temperature of recrystallization; Or the hot forming temperature more than the temperature of fully carrying out recrystallization; Heat time t determines that the method for the shortest heat time is determined when adopting electromagnetic induction heating in forging, and wherein in bringing-up section a, workpiece centre temperature and the poor Δ T of surface layer temperatures select in 200 ℃～(T-50 ℃) scope;
Step 3, workpiece (2) bringing-up section enters space section b between medium-high frequency induction heater (4) and rolling die (5),
Workpiece (2) bringing-up section aligns near the same rolling die in rolling die (5) one end (5) end face;
Step 4, continuous medium-high frequency eddy-current heating and axial feed, complete the above rollforming of screw thread of workpiece (2) by rolling die (5),
When the upper shaping thread segment of workpiece (2) all departs from after medium-high frequency induction heater (4), medium-high frequency induction heater (4) quits work; The synchronous rotating in same direction of two rolling dies (5), two rolling dies (5) are made radial feed simultaneously, and in the time that rolling die (5) completes radially total feed amount S, rolling die (5) stops radial feed, only rotates;
Surface heating layer depth Δ in bringing-up section a should meet formula
Figure FDA0000461287260000021
workpiece (2) axial feed velocity v ashould meet formula v a = &Delta;L t ;
In formula: Δ L is that workpiece (2) often turns axial feeding, Δ L is definite by difference and rolling die (5) rotating speed of the lead angle on rolling die (5) surface and the lead angle of the screw element that is formed,
Rolling die (5) radial feed speed v rshould meet formula
Figure FDA0000461287260000031
Step 5, workpiece (2) is clamped and is oppositely exited by front top (1) and back centre (3) simultaneously, discharging.
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CN103191964B (en) * 2013-03-14 2015-01-14 西安交通大学 Servo direct-drive type incremental rolling forming process for cylindrical piece with teeth inside and outside
CN103624339A (en) * 2013-12-10 2014-03-12 中国航空工业标准件制造有限责任公司 Method for manufacturing warm rolling threads of high temperature alloy fastener
CN105537475A (en) * 2015-11-20 2016-05-04 江门市宏乔新材料科技有限公司江海区分公司 Screw thread rolling processing mechanism
CN105964843B (en) * 2016-06-17 2019-03-05 贵州航飞精密制造有限公司 It is a kind of that TC4 titanium alloy material rolled thread is avoided to generate the processing method folded

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CN101722256A (en) * 2009-11-27 2010-06-09 刘德刚 Screw rod hot rolling molding process and equipment thereof
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