CN104831023A - Thermal treatment technology for ball screws of machine tool - Google Patents
Thermal treatment technology for ball screws of machine tool Download PDFInfo
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- CN104831023A CN104831023A CN201510260109.3A CN201510260109A CN104831023A CN 104831023 A CN104831023 A CN 104831023A CN 201510260109 A CN201510260109 A CN 201510260109A CN 104831023 A CN104831023 A CN 104831023A
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Abstract
The invention provides a thermal treatment technology for ball screws of a machine tool. The thermal treatment technology comprises the steps of: step 1, putting the ball screws into a medium-frequency induction machine to carry out quenching heating; step 2, putting the ball screws into a hardening furnace with nitrate to carry out second quenching; step 3, putting the ball screws into forging equipment to carry out hot-pressing straightening treatment; step 4, putting the ball screws into a tempering box to carry out tempering treatment; step 5, checking the sizes of the ball screws; step 6, putting the ball screws into the tempering tank again to carry out second tempering treatment; step 7, putting the ball screws on the table top of a cleaning machine to clean the ball screws; step 8, putting the ball screws on a fixture body of the machine tool to carry out machining; and step 9, carrying out aging treatment on the machined ball screws at a room temperature or a relatively high temperature. The thermal treatment technology solves the phenomenon of bending deformation or cracking of long and thin ball screws. The ball screws treated by adopting the thermal treatment technology have good wear resistance, long service life and relatively good popularization and application values in mechanical industries.
Description
Technical field
The present invention relates to part processing and heat treatment technical field, specifically a kind of thermal treatment process of lathe ball screw.
Background technology
Ball screw is part conventional on lathe, it is a kind of important parts on lathe, the length-to-diameter ratio of ball screw is > 19, material is GCr15 steel, usual thermal treatment process often adopts intermediate frequency, high frequency, nicarbing process, after thermal treatment, elongated screw mandrel easily bends or cracking phenomena.
Summary of the invention
The object of the invention is to overcome the above-mentioned deficiency of prior art and a kind of thermal treatment process of lathe ball screw is provided; It can solve flexural deformation or the cracking phenomena of elongated screw mandrel, and wear resistance is good, long service life, and can adopt pretension that gap is eliminated, and ensures high precision when increasing moment of torsion not too much.
Technical scheme of the present invention is: a kind of thermal treatment process of lathe ball screw, and it comprises the following steps:
The first step: screw mandrel is put in Medium frequency induction machine and carry out Quench heating.
Second step: screw mandrel is put into and carries out second time quenching with in nitrate grouping quenching furnance.
3rd step: screw mandrel is put into forging equipment, carries out hot pressing alignment process.
4th step: screw mandrel is put into tempering box in carry out temper.
5th step: check screw mandrel size.
6th step: screw mandrel is put into again tempering box in carry out second time temper.
7th step: screw mandrel is put on the table top in cleaning machine and clean.
8th step: put into by screw mandrel on the clamp body of machining tool, carries out mechanical workout.
9th step: by process screw mandrel put what room temperature or comparatively high temps under carry out ageing treatment.
Further, in order to ensure the hardness at screw thread place, obtain good hardening capacity and hardenability, described quenching temperature controls at 850 DEG C.
Further, for reducing quench bend distortion, for reducing quench bend distortion, described alignment, adopts 160 ~ 180 DEG C, salt made from earth containing a comparatively high percentage of sodium chloride classification or isothermal quenching, adopts the superplasticity of A → M phase change zone to carry out hot pressing alignment, ensures the hardenability of screw thread.
Further, be reduce residual austenite and unrelieved stress, obtain the hardness that needs and stable tissue or size, described ageing treatment, be to be everlasting after low-temperaturetempering before (low tempering temperatures 150 ~ 250 DEG C) precision work, workpiece reheated to 100 ~ 150 DEG C, keeps 5 ~ 20 hours.
Further, after described screw mandrel timeliness, the hardness of threaded portion is HRC58 ~ 62, and two ends hardness is not more than HRC30, and brill ф 5 ~ ф 6 hole is joined at two ends; Diameter run-out is less than or equal to 0.3mm.
The invention has the beneficial effects as follows: adopt above-mentioned process heat treatment process, it can solve flexural deformation or the cracking phenomena of elongated screw mandrel, wear resistance is good, long service life, and can adopt pretension that gap is eliminated, ensureing high precision when increasing moment of torsion not too much, having in machinery industry and applying preferably.
Embodiment
Technical scheme of the present invention is: a kind of thermal treatment process of lathe ball screw, and it comprises the following steps:
The first step: put into by screw mandrel in the Medium frequency induction machine of 100KW and carry out Quench heating, quenching temperature is 840 ~ 950 DEG C, and soaking time is 1 ~ 2 hour.
Second step: the screw mandrel crossed by Quench heating is put into and carried out second time quenching with in nitrate grouping quenching furnance, and quenching temperature is 880 ~ 900 DEG C, and soaking time is 1 ~ 2 hour.
3rd step: the screw mandrel quenched with nitrate is put into forging equipment, carries out hot pressing alignment process, and after correction, must not there be obviously bending and crackle on both sides.
4th step: the screw mandrel of alignment process is put into tempering box in carry out temper, immerse in the solution with salt solution after tempering, be conducive to so thoroughly eliminating internal stress, improve the plasticity of steel and toughness.
5th step: the screw mandrel size checking tempering,
6th step: be reduce residual austenite and unrelieved stress, screw mandrel is put into again tempering box in carry out second time temper.
7th step: put into by the screw mandrel of second time tempering on the table top in cleaning machine and clean, dry up after cleaning with air gun, ensures without greasy dirt, surface luster.
8th step: put on the clamp body of machining tool by cleaned screw mandrel, installs and fixes clamp body, carry out mechanical workout with cutter to screw mandrel.
9th step: by process screw mandrel put what room temperature or comparatively high temps under keep appropriate time, carry out ageing treatment, to improve the mechanical property of screw mandrel.
In order to ensure the hardness at screw thread place, obtain good hardening capacity and hardenability, described quenching temperature controls at 850 DEG C.
For reducing quench bend distortion, for reducing quench bend distortion, described alignment, adopts 160 ~ 180 DEG C, salt made from earth containing a comparatively high percentage of sodium chloride classification or isothermal quenching, adopts the superplasticity of A → M phase change zone to carry out hot pressing alignment, ensures the hardenability of screw thread.
For reducing residual austenite and unrelieved stress, obtaining the hardness that needs and stable tissue or size, described ageing treatment, is to be everlasting after low-temperaturetempering before (low tempering temperatures 150 ~ 250 DEG C) precision work, workpiece is reheated to 100 ~ 150 DEG C, keeps 5 ~ 20 hours.
After described screw mandrel timeliness, the hardness of threaded portion is HRC58 ~ 62, and two ends hardness is not more than HRC30, and brill ф 5 ~ ф 6 hole is joined at two ends; Diameter run-out is less than or equal to 0.3mm.
Claims (5)
1. a thermal treatment process for lathe ball screw, is characterized in that: it comprises the following steps:
The first step: screw mandrel is put in Medium frequency induction machine and carry out Quench heating;
Second step: screw mandrel is put into and carries out second time quenching with in nitrate grouping quenching furnance;
3rd step: screw mandrel is put into forging equipment, carries out hot pressing alignment process;
4th step: screw mandrel is put into tempering box in carry out temper;
5th step: check screw mandrel size;
6th step: screw mandrel is put into again tempering box in carry out second time temper;
7th step: screw mandrel is put on the table top in cleaning machine and clean;
8th step: put into by screw mandrel on the clamp body of machining tool, carries out mechanical workout;
9th step: by process screw mandrel put what room temperature or comparatively high temps under carry out ageing treatment.
2. the thermal treatment process of a kind of lathe ball screw according to claim 1, is characterized in that: described quenching temperature controls at 850 DEG C.
3. the thermal treatment process of a kind of lathe ball screw according to claim 1, is characterized in that: described alignment, adopts 160 ~ 180 DEG C, salt made from earth containing a comparatively high percentage of sodium chloride classification or isothermal quenching, adopts the superplasticity of A → M phase change zone to carry out hot pressing alignment, ensures the hardenability of screw thread.
4. the thermal treatment process of a kind of lathe ball screw according to claim 1, it is characterized in that: described ageing treatment, be to be everlasting after low-temperaturetempering before (low tempering temperatures 150 ~ 250 DEG C) precision work, workpiece reheated to 100 ~ 150 DEG C, keeps 5 ~ 20 hours.
5. the thermal treatment process of a kind of lathe ball screw according to claim 1, is characterized in that: after described screw mandrel timeliness, the hardness of threaded portion is HRC58 ~ 62, and two ends hardness is not more than HRC30, and brill ф 5 ~ ф 6 hole is joined at two ends; Diameter run-out is less than or equal to 0.3mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510260109.3A CN104831023A (en) | 2015-05-21 | 2015-05-21 | Thermal treatment technology for ball screws of machine tool |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510260109.3A CN104831023A (en) | 2015-05-21 | 2015-05-21 | Thermal treatment technology for ball screws of machine tool |
Publications (1)
| Publication Number | Publication Date |
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| CN104831023A true CN104831023A (en) | 2015-08-12 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510260109.3A Pending CN104831023A (en) | 2015-05-21 | 2015-05-21 | Thermal treatment technology for ball screws of machine tool |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110293375A (en) * | 2019-07-02 | 2019-10-01 | 浙江百润轴承有限公司 | A kind of production technology of thin-wall bearing |
| CN111118260A (en) * | 2020-01-15 | 2020-05-08 | 江苏南钢通恒特材科技有限公司 | GCr15 heat treatment process |
-
2015
- 2015-05-21 CN CN201510260109.3A patent/CN104831023A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110293375A (en) * | 2019-07-02 | 2019-10-01 | 浙江百润轴承有限公司 | A kind of production technology of thin-wall bearing |
| CN111118260A (en) * | 2020-01-15 | 2020-05-08 | 江苏南钢通恒特材科技有限公司 | GCr15 heat treatment process |
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| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20150812 |
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| WD01 | Invention patent application deemed withdrawn after publication |