CN102586572A - Novel heat treatment process and processing method for trapezoidal screw machined by using non-quenched and tempered steel - Google Patents
Novel heat treatment process and processing method for trapezoidal screw machined by using non-quenched and tempered steel Download PDFInfo
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- CN102586572A CN102586572A CN2012100750494A CN201210075049A CN102586572A CN 102586572 A CN102586572 A CN 102586572A CN 2012100750494 A CN2012100750494 A CN 2012100750494A CN 201210075049 A CN201210075049 A CN 201210075049A CN 102586572 A CN102586572 A CN 102586572A
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Abstract
The invention discloses a novel heat treatment process for a trapezoidal screw machined by using non-quenched and tempered steel. The novel heat treatment process comprises the following steps of: (1) roughly machining and performing high-temperature aging treatment; (2) roughly machining a thread and performing low-temperature aging treatment; and (3) semifinishing the thread and performing low-temperature setting aging treatment. The novel heat treatment process has the advantages that: the aging treatment under different conditions is performed at different stages of machining the trapezoidal screw by using the non-quenched and tempered steel, so that the internal stress of a workpiece is eliminated, the hardness, mechanical properties and dimensional stability of the workpiece are effectively ensured, and the accuracy of the trapezoidal screw is improved.
Description
Technical field
The present invention relates to the leading screw working method in the field of mechanical technique, particularly a kind of non-modified (physical construction) steel processing trapezoidal screw is with New Technology of Heat Treatment and working method thereof.
Background technology
Trapezoidal screw is one of lathe major part, is widely used in the feed mechanism and adjusting travel mechanism of all kinds of lathes.Its precision height directly influences the precision of lathe and instrument.Along with the appearance of high-efficient automatic lathe and NEW TYPES OF TOOL MATERIALS, cutting speed improves constantly and special conditions is on active service down, all trapezoidal screw material and thermal treatment is had higher requirement.
Quenched and tempered steel and non-modified engineering steel (hereinafter to be referred as non-hardened and tempered steel) all can be used for processing trapezoidal screw.Wherein, non-hardened and tempered steel is through microalloying, and method for toughening such as controlled rolling (forging) and controlled chilling have been cancelled modified thermal treatment, reaches or near the one type of high-quality or the very special quality structure iron of quenched and tempered steel mechanical property.This type steel reaches request for utilization in the mechanical property of hot-rolled state, as-forged condition, has shortened the production cycle, has saved the energy.The non-hardened and tempered steel material is used non-hardened and tempered steel with non-hardened and tempered steel with directly cutting by using the working method difference to be divided into thermal pressure processing.Do not carry out modified (precision part high temperature normalizing) performance after these type of starting material dispatch from the factory and just reach the modified performance of medium carbon steel; Direct processor part (like transmission shaft, connecting rod, leading screw etc.) has omitted modified again heat treatment step after the normalizing, has saved the energy, has reduced environmental pollution, has shortened the production cycle; Be easy to cut; Having reduced tooling cost, improved production efficiency, is current domestic, type material that the world is widelyd popularize.
For example, F45MnVS is the non-modified engineering steel of a kind of easy cutting, and its intensity index is suitable with 45# steel quenched and tempered state, and cutting ability is superior to the as-normalized condition of 45# steel.Be used to replace the 45# steel processing axle part after modified, be particularly useful for making strict slender rod piece of deformation requirements such as lathe leading screw etc.
At present, when using non-hardened and tempered steel processing precise trapezoidal screw, for the rolling stress of eliminating the round steel blank makes its interior tissue refinement; Need carry out high temperature normalizing to blank and handle, after the normalizing, though well eliminated stress; But the hardness and the mechanical property of round steel blank obviously reduce simultaneously, cause the trapezoidal screw distortion serious, poor dimensional stability; Precision is low, and the increase manufacturing cost wastes energy.
Summary of the invention
To the problem of traditional non-hardened and tempered steel processing precise trapezoidal screw with thermal treatment process reduction round steel blank hardness, performance and dimensional stability, the embodiment of the invention provides a kind of non-hardened and tempered steel processing trapezoidal screw with New Technology of Heat Treatment and working method thereof.
In order to realize the foregoing invention purpose, the invention provides a kind of non-hardened and tempered steel processing precise trapezoidal screw and use New Technology of Heat Treatment, said New Technology of Heat Treatment comprises following processing:
(1) carrying out high-temperature aging after the roughing handles;
(2) carrying out low temperature aging behind the roughing screw thread handles;
(3) carry out low-temperature shaped ageing treatment behind the semi-finishing screw thread.
In the said processing (1), between roughing step and cylindrical grinding step, increase the high-temperature aging treatment step; In the said processing (2), between roughing screw thread step and semi-finishing screw thread step, increase the low temperature aging treatment step; In the said processing (3), between semi-finishing screw thread step and correct grinding cylindrical step, increase low-temperature shaped ageing treatment step.
The temperature of the high-temperature aging in the said processing (1) is 500-700 ℃, holds time to be 4-12 hour.
The temperature of the low temperature aging in the said processing (2) is 160-300 ℃, holds time to be 6-8 hour.
The temperature of the low-temperature shaped timeliness in the said processing (3) is 140-200 ℃, holds time to be 6-8 hour.
The temperature of the high-temperature aging in the said processing (1) is preferably 520-620 ℃, and holding time is preferably 4-8 hour.
The temperature of the low temperature aging in the said processing (2) is preferably 200-250 ℃.
The temperature of the low-temperature shaped timeliness in the said processing (3) is preferably 160-180 ℃.
The present invention also provides a kind of working method that comprises above-mentioned non-hardened and tempered steel processing trapezoidal screw with New Technology of Heat Treatment, and working method may further comprise the steps: blanking, alignment, roughing, alignment, high-temperature aging, cylindrical grinding, roughing screw thread, low temperature aging, semi-finishing screw thread, low-temperature shaped timeliness, correct grinding cylindrical and precision work screw thread.
Wherein, need carry out alignment and roughing to blank after the blanking, roughing is to be purpose with quick excision blank surplus, when roughing, should select the big amount of feed and big as far as possible depth of cut for use, so that excise smear metal as much as possible in the short period of time.But; Blank exists rolling internal stress and alignment and roughing itself can let workpiece produce internal stress, concerning the higher trapezoidal screw of accuracy requirement, because internal stress has the tendency that fades away; And the disappearance of internal stress can cause the distortion of trapezoidal screw, and then has influenced the precision of trapezoidal screw.
In the trapezoidal screw course of processing; In order to obtain higher precision, be divided into repeatedly processing with screw thread to foreign round, like corase grind cylindrical, correct grinding cylindrical and semi-finishing screw thread, precision work screw thread; Gradually reduce cutting output; Thereby gradually reduce cutting force and internal stress, reduce mismachining tolerance, improve working accuracy.
Ageing treatment is meant alloy workpiece through solution treatment, and cold plastic deformation or casting after the forging, are placed or room temperature keeps the thermal treatment process of its performance, shape, size time to time change in higher temperature.If adopt workpiece is heated to comparatively high temps, and the short period carry out the aging treatment process of ageing treatment, be called artificial aging and handle, if workpiece is placed on long storage time under room temperature or the natural condition and the aging phenomenon that takes place, be called natural aging treatment.The third mode be oscillating aging from the eighties from the beginning of progressively getting into the practical stage; Oscillating aging is handled then not heating and is not also resembled under the situation time-consuming the seasoning; Use the vibration that applies certain frequency to work that its internal stress is released, thereby reach the purpose of timeliness.The purpose of ageing treatment is to eliminate internal stress, stabilizing tissue and the size of workpiece, improve mechanical property etc.
The beneficial effect that the technical scheme that the embodiment of the invention provides is brought is: the ageing treatment of carrying out different condition in the different steps of non-hardened and tempered steel processing trapezoidal screw; Not only eliminated the internal stress of workpiece; And effectively guaranteed hardness, mechanical property and the dimensional stability of workpiece, improved the precision of trapezoidal screw.Wherein, carry out high-temperature aging after the roughing, before the cylindrical grinding, the stress that produces during roughing when eliminating rolling blank simultaneously and after the blanking, and guaranteed raw-material hardness; Behind the roughing screw thread, semi-finishing screw advancement row low temperature aging, the stress that produces when effectively eliminating whirlwind thread milling or rough threading workpiece; Behind the semi-finishing screw thread, correct grinding carries out low-temperature shaped timeliness before the cylindrical, the stress that produces when effectively eliminating the semi-finishing workpiece has improved the stability of workpiece size.In addition, compare save energy with traditional leading screw complete processing.
Embodiment
Embodiment 1
The embodiment of the invention provides a kind of non-hardened and tempered steel processing trapezoidal screw to use New Technology of Heat Treatment, and New Technology of Heat Treatment comprises following processing:
(1) after the roughing, carry out high-temperature aging before the cylindrical grinding, the temperature of high-temperature aging is 500 ℃, holding time is 10 hours;
(2) behind the roughing screw thread, semi-finishing screw advancement row low temperature aging, the temperature of low temperature aging is 160 ℃, holding time is 8 hours;
(3) carry out low-temperature shaped timeliness behind the semi-finishing screw thread, the temperature of low-temperature shaped timeliness is 160 ℃, and holding time is 8 hours.
The embodiment of the invention also provides a kind of trapezoidal screw working method that comprises above-mentioned non-hardened and tempered steel processing trapezoidal screw with New Technology of Heat Treatment, and step is following: blanking, alignment, roughing, alignment, high-temperature aging, corase grind cylindrical, whirlwind thread milling, low temperature aging, semi-finishing screw thread, low-temperature shaped timeliness, correct grinding cylindrical and precision work screw thread.
Embodiment 2
The embodiment of the invention provides a kind of non-hardened and tempered steel processing trapezoidal screw to use New Technology of Heat Treatment, and said New Technology of Heat Treatment comprises following processing:
(1) after the roughing, carry out high-temperature aging before the cylindrical grinding, the temperature of high-temperature aging is 550 ℃, holding time is 8 hours;
(2) behind the roughing screw thread, semi-finishing screw advancement row low temperature aging, the temperature of low temperature aging is 220 ℃, holding time is 7 hours;
(3) carry out low-temperature shaped timeliness behind the semi-finishing screw thread, the temperature of low-temperature shaped timeliness is 170 ℃, and holding time is 7 hours.
The embodiment of the invention also provides a kind of trapezoidal screw working method that comprises above-mentioned non-hardened and tempered steel processing trapezoidal screw with New Technology of Heat Treatment, and step is following: blanking, alignment, roughing, alignment, high-temperature aging, corase grind cylindrical, rough threading, low temperature aging, semi-finishing screw thread, low-temperature shaped timeliness, correct grinding cylindrical and precision work screw thread.
Embodiment 3
The embodiment of the invention provides a kind of non-hardened and tempered steel processing trapezoidal screw to use New Technology of Heat Treatment, and said New Technology of Heat Treatment comprises following processing:
(1) after the roughing, carry out high-temperature aging before the cylindrical grinding, the temperature of high-temperature aging is 620 ℃, holding time is 12 hours;
(2) behind the roughing screw thread, semi-finishing screw advancement row low temperature aging, the temperature of low temperature aging is 190 ℃, holding time is 7.5 hours;
(3) carry out low-temperature shaped timeliness behind the semi-finishing screw thread, the temperature of low-temperature shaped timeliness is 165 ℃, and holding time is 6.5 hours.
The embodiment of the invention also provides a kind of trapezoidal screw working method that comprises above-mentioned non-hardened and tempered steel processing trapezoidal screw with New Technology of Heat Treatment, and step is following: blanking, alignment, roughing, alignment, high-temperature aging, corase grind cylindrical, roughing screw thread, low temperature aging, semi-finishing screw thread, low-temperature shaped timeliness, correct grinding cylindrical and precision work screw thread.
Embodiment 4
The embodiment of the invention provides a kind of non-hardened and tempered steel processing trapezoidal screw to use New Technology of Heat Treatment, and said New Technology of Heat Treatment comprises following processing:
(1) after the roughing, carry out high-temperature aging before the cylindrical grinding, the temperature of high-temperature aging is 650 ℃, holding time is 4 hours;
(2) behind the roughing screw thread, semi-finishing screw advancement row low temperature aging, the temperature of low temperature aging is 280 ℃, holding time is 6.5 hours;
(3) carry out low-temperature shaped timeliness behind the semi-finishing screw thread, the temperature of low-temperature shaped timeliness is 175 ℃, and holding time is 5.5 hours.
The embodiment of the invention also provides a kind of trapezoidal screw working method that comprises above-mentioned non-hardened and tempered steel processing trapezoidal screw with New Technology of Heat Treatment, and step is following: blanking, alignment, roughing, alignment, high-temperature aging, corase grind cylindrical, roughing screw thread, low temperature aging, semi-finishing screw thread, low-temperature shaped timeliness, correct grinding cylindrical and precision work screw thread.
Embodiment 5
The embodiment of the invention provides a kind of non-hardened and tempered steel processing trapezoidal screw to use New Technology of Heat Treatment, and said New Technology of Heat Treatment comprises following processing:
(1) after the roughing, carry out high-temperature aging before the cylindrical grinding, the temperature of high-temperature aging is 700 ℃, holding time is 6 hours;
(2) behind the roughing screw thread, semi-finishing screw advancement row low temperature aging, the temperature of low temperature aging is 300 ℃, holding time is 6 hours;
(3) carry out low-temperature shaped timeliness behind the semi-finishing screw thread, the temperature of low-temperature shaped timeliness is 180 ℃, and holding time is 6 hours.
The embodiment of the invention also provides a kind of trapezoidal screw working method that comprises above-mentioned non-hardened and tempered steel processing trapezoidal screw with New Technology of Heat Treatment, and step is following: blanking, alignment, roughing, alignment, high-temperature aging, corase grind cylindrical, roughing screw thread, low temperature aging, semi-finishing screw thread, low-temperature shaped timeliness, correct grinding cylindrical and precision work screw thread.
The contrast experiment:
Embodiment of the invention 1-5 and traditional trapezoidal screw working method are carried out the contrast experiment of changes in hardness before and after dimensional stability and the processing; Dimensional stability respectively after roughing during alignment process outer circle diameter circular bending diameter run-out degree and cumulative pitch error and precision work screw thread operation cumulative pitch error outside level of flapping, roughing screw thread operation compare, the result is as shown in table 1; The changes in hardness result is as shown in table 2 before and after the processing.
Wherein, the working method of traditional trapezoidal screw is: blanking, high temperature normalizing (900-950 ℃), alignment, roughing, alignment, aging of middle temperature, cylindrical grinding, whirlwind thread milling, half finish turning screw thread, low temperature aging, correct grinding cylindrical, precision work screw thread.
Table 1 trapezoidal screw dimensional stability synopsis
Can know from the data of table 1: processing trapezoidal screw process, outer circle diameter is significantly less than the employing traditional diamond-making technique to level of flapping and cumulative pitch error when the New Technology of Heat Treatment of the employing embodiment of the invention and working method thereof.
Table 2: changes in hardness synopsis before and after the processing
| Group | Embodiment group 1 | Embodiment group 2 | Embodiment group 3 | Embodiment group 4 | Embodiment group 5 | Control group |
| Changes in hardness | 0 HB | 0 HB | 1 HB | 3 HB | 4 HB | 50 HB |
Can know from the data of table 2: the trapezoidal screw of conventional machining process processing is compared with the round steel blank; Hardness reduces by 50 HB; And the trapezoidal screw that the New Technology of Heat Treatment that adopts the embodiment of the invention is processed; Changes in hardness is little before and after the processing, and the trapezoidal screw thermal treatment and the complete processing that promptly adopt the embodiment of the invention to provide have effectively been safeguarded the hardness of blank.
Can know through the contrast experiment,, and then change the trapezoidal screw working method through change trapezoidal screw thermal treatment process; After promptly comprising roughing, carry out high-temperature aging before the cylindrical grinding; Behind the roughing screw thread, semi-finishing screw advancement row low temperature aging, carry out low-temperature shaped timeliness behind the semi-finishing screw thread, not only eliminated the internal stress of workpiece; And effectively guaranteed hardness, mechanical property and the dimensional stability of workpiece, improved the working accuracy of trapezoidal screw.Wherein, After the roughing during alignment process outer circle diameter circular bending diameter run-out degree and cumulative pitch error and precision work screw thread operation cumulative pitch error outside level of flapping, roughing screw thread operation be significantly less than traditional diamond-making technique; It is the internal stress that the embodiment of the invention produces when not only effectively elimination is owing to manufacturing procedures such as alignment, roughing; And guaranteed raw-material hardness and mechanical property, and be convenient to the following process of trapezoidal screw, obviously improved the dimensional stability and the precision of workpiece.
The above is merely preferred embodiment of the present invention, and is in order to restriction the present invention, not all within spirit of the present invention and principle, any modification of being done, is equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (9)
1. non-hardened and tempered steel processing trapezoidal screw is used New Technology of Heat Treatment, it is characterized in that said New Technology of Heat Treatment comprises following processing:
(1) carrying out high-temperature aging after the roughing handles;
(2) carrying out low temperature aging behind the roughing screw thread handles;
(3) carry out low-temperature shaped ageing treatment behind the semi-finishing screw thread.
2. non-hardened and tempered steel processing trapezoidal screw according to claim 1 is used New Technology of Heat Treatment, it is characterized in that, in the said processing (1), between roughing step and cylindrical grinding step, increases the high-temperature aging treatment step; In the said processing (2), between roughing screw thread step and semi-finishing screw thread step, increase the low temperature aging treatment step; In the said processing (3), between semi-finishing screw thread step and correct grinding cylindrical step, increase low-temperature shaped ageing treatment step.
3. non-hardened and tempered steel processing trapezoidal screw according to claim 1 and 2 is used New Technology of Heat Treatment, it is characterized in that the temperature of the high-temperature aging in the said processing (1) is 500-700 ℃, and holding time is 4-12 hour.
4. non-hardened and tempered steel processing trapezoidal screw according to claim 1 and 2 is used New Technology of Heat Treatment, it is characterized in that the temperature of the low temperature aging in the said processing (2) is 160-300 ℃, and holding time is 6-8 hour.
5. non-hardened and tempered steel processing trapezoidal screw according to claim 1 and 2 is used New Technology of Heat Treatment, it is characterized in that the temperature of the low-temperature shaped timeliness in the said processing (3) is 140-200 ℃, and holding time is 6-8 hour.
6. non-hardened and tempered steel processing trapezoidal screw according to claim 3 is used New Technology of Heat Treatment, it is characterized in that the temperature of the high-temperature aging in the said processing (1) is 520-620 ℃, and holding time is 4-8 hour.
7. non-hardened and tempered steel processing trapezoidal screw according to claim 4 is used New Technology of Heat Treatment, it is characterized in that the temperature of the low temperature aging in the said processing (2) is 200-250 ℃.
8. non-hardened and tempered steel processing trapezoidal screw according to claim 5 is used New Technology of Heat Treatment, it is characterized in that the temperature of the low-temperature shaped timeliness in the said processing (3) is 160-180 ℃.
9. one kind comprises like the working method of the described non-hardened and tempered steel processing of claim 1-8 trapezoidal screw with New Technology of Heat Treatment; It is characterized in that said working method may further comprise the steps: blanking, alignment, roughing, alignment, high-temperature aging, cylindrical grinding, roughing screw thread, low temperature aging, semi-finishing screw thread, low-temperature shaped timeliness, correct grinding cylindrical and precision work screw thread.
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| CN2012100750494A CN102586572A (en) | 2012-03-21 | 2012-03-21 | Novel heat treatment process and processing method for trapezoidal screw machined by using non-quenched and tempered steel |
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| CN2012100750494A CN102586572A (en) | 2012-03-21 | 2012-03-21 | Novel heat treatment process and processing method for trapezoidal screw machined by using non-quenched and tempered steel |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104959791A (en) * | 2015-07-07 | 2015-10-07 | 成都亨通兆业精密机械有限公司 | Precise lead screw machining technology |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101661230A (en) * | 2009-09-24 | 2010-03-03 | 项建龙 | Grinding technique for aluminum alloy drum of external-drum type plate-making machine |
-
2012
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Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101661230A (en) * | 2009-09-24 | 2010-03-03 | 项建龙 | Grinding technique for aluminum alloy drum of external-drum type plate-making machine |
Non-Patent Citations (3)
| Title |
|---|
| 《山西机械》 20010131 焦正音，等 "GCr15制滚珠丝杠热处理工艺研究" 37-38 3,5-6,8 , 第1期 * |
| 焦正音，等: ""GCr15制滚珠丝杠热处理工艺研究"", 《山西机械》 * |
| 范崇洛，等: "《机械加工工艺学》", 30 April 2002 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104959791A (en) * | 2015-07-07 | 2015-10-07 | 成都亨通兆业精密机械有限公司 | Precise lead screw machining technology |
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Application publication date: 20120718 |