CN1059565A - Sub-temperature quench for improving cutting property of quenched and tempered steel - Google Patents
Sub-temperature quench for improving cutting property of quenched and tempered steel Download PDFInfo
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- CN1059565A CN1059565A CN 91105770 CN91105770A CN1059565A CN 1059565 A CN1059565 A CN 1059565A CN 91105770 CN91105770 CN 91105770 CN 91105770 A CN91105770 A CN 91105770A CN 1059565 A CN1059565 A CN 1059565A
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Abstract
A kind of novel process of sub-temperature quench for improving 40Cr cutting ability, it is that increase prequenching and intercritical hardening two procedures realize after the former technology modifier treatment of cancellation.This technology can make 40Cr change metallographic structure, makes it to become the martensitic mixed structure of bar-shaped ferrite and strip, thereby has guaranteed good comprehensive mechanical performance.Using this technology also makes workpiece surface roughness reduce significantly; Reduce cutting force; Improve tool life, prolong cutter life, this technology is handled 40Cr.More former hardening and tempering process per kilogram can be saved about 1.50 yuan.It is rather considerable to apply the back economic benefit.And technology is easy need not to increase equipment newly.
Description
The present invention relates to a kind of metallic substance New Technology of Heat Treatment method, exactly is a kind of New Technology of Heat Treatment of the 40Cr of improvement material cutting ability.
Behind the 40Cr forging molding before the precision work in order to improve mechanical property, the general processing method of selecting is: normalizing-roughing-modified-semi-finishing-precision work.Though this kind processing method can improve the comprehensive mechanical performance of 40Cr, but the cutting ability after modified is poor, particularly draws, insert poor performance.Surfaceness has only
About, add and not only give up cutter man-hour but also the broaching tool tensile phenomenon often takes place.
In order further to improve the cutting ability of 40Cr, some country has taked the raising cutting speed or has increased finishing steps such as correct grinding, the top gem of a girdle-pendant.But the present at home difficulty that these measures have realizes, or the increase operation, raises the cost, and is not very good.
The objective of the invention is to provide a kind of new processing method, just the new process of sub-temperature quench for improving 40Cr cutting ability.It can improve the cutting ability of 40Cr material well under the situation that does not increase existing equipment, and whole heat treatment time is short, and workpiece processing rear surface roughness reduces.
The object of the present invention is achieved like this:
After the roughing of 40Cr product, do not carry out modifier treatment, quench greatly and at first carry out 860 ℃ give, make austenitic transformation be martensite, reheat 760 ℃～770 ℃ immediately, carry out intercritical hardening after the short period of time insulation, making the structural transformation of giving after the quenching is bar-shaped ferrite and strip martensite mixed structure.
The major advantage of using this technology is:
1, because the 40Cr structural transformation of giving after the quenching is bar-shaped ferrite and strip martensite, the more conventional ferrite hardness of bar-shaped ferrite hardness height, dislocation desity is big, and strip martensite is lower than conventional martensite hardness, thereby cutting ability is improved, be difficult for producing BUE and squama thorn, surfaceness exists
Below, reduced by 1～2 grade than hardening and tempering process, therefore, can save finishing steps such as mill, the top gem of a girdle-pendant;
2, can reduce cutting force (F2)～17%, tool life improves more than three times, has prolonged the work-ing life of cutter;
3, the more former technology of novel process has shortened man-hour, is example with the 40Cr gear, and according to predesigne, per kilogram can reduce cost about 1,50 yuan, and only coal system 40Cr material accessory is annual about 5000 tons, can save 700 surplus ten thousand yuan;
4, novel process can reach the suitable comprehensive mechanical performance of former hardening and tempering process, sees the following form:
5, adopt the more former technology of the present invention not increase equipment.
According to the principle of intercritical hardening novel process, it is as follows to introduce its process detail in detail below:
The program of sub-temperature quench for improving 40Cr cutting ability novel process is: forging molding-normalizing-roughing-give quenching-intercritical hardening-precision work.
After forging molding and normalizing, roughing normally, give quenching, its objective is that making tissue into later intercritical hardening prepares.Concrete technology is: 860 ℃ of Heating temperatures, soaking time are pressed workpiece size decision (same normal quenching), subsequently at oil quenching.
Sub-temperature quenching process is: 760 ℃～770 ℃ of Heating temperatures, soaking time are pressed thickness of workpiece and are calculated: T=0,5～0,8S(branch) (S-thickness of workpiece mm), oil quenching, hardness HRC22～25.Generally, complex-shaped as workpiece without tempering, can carry out 250 ℃ of low-temperaturetemperings, to remove unrelieved stress.With can draw, insert, finish turning or the like precision work.Surfaceness
On can not grind, retrofit such as the top gem of a girdle-pendant.
Claims (2)
1, a kind of novel process of sub-temperature quench for improving 40Cr cutting ability, it comprises: forging forming, normalizing, roughing, it is characterized in that: after roughing, at first carry out 860 ℃ and give quenching, reheat 760 ℃～770 ℃ immediately and carry out carrying out intercritical hardening after the short period of time insulation.
2, technology according to claim 1 is characterized in that: all needs draw other surface of hole roughing of keyway the time also hole roughing should be come out, and can give quenching afterwards.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 91105770 CN1059565A (en) | 1991-08-14 | 1991-08-14 | Sub-temperature quench for improving cutting property of quenched and tempered steel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 91105770 CN1059565A (en) | 1991-08-14 | 1991-08-14 | Sub-temperature quench for improving cutting property of quenched and tempered steel |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1059565A true CN1059565A (en) | 1992-03-18 |
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ID=4907337
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 91105770 Pending CN1059565A (en) | 1991-08-14 | 1991-08-14 | Sub-temperature quench for improving cutting property of quenched and tempered steel |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1059565A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102051453A (en) * | 2010-12-29 | 2011-05-11 | 西安航天精密机电研究所 | Method for quenching small-size No. 45 steel parts |
| CN102990314A (en) * | 2012-12-02 | 2013-03-27 | 齐重数控装备股份有限公司 | Machining method of hex-equant external diameter centering spline gear |
| US10779569B2 (en) | 2012-09-04 | 2020-09-22 | Philip Morris Products S.A. | Insulated heat source |
-
1991
- 1991-08-14 CN CN 91105770 patent/CN1059565A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102051453A (en) * | 2010-12-29 | 2011-05-11 | 西安航天精密机电研究所 | Method for quenching small-size No. 45 steel parts |
| US10779569B2 (en) | 2012-09-04 | 2020-09-22 | Philip Morris Products S.A. | Insulated heat source |
| CN102990314A (en) * | 2012-12-02 | 2013-03-27 | 齐重数控装备股份有限公司 | Machining method of hex-equant external diameter centering spline gear |
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