CN104073813A - Thermal treatment process of piston of rock drill made of 35CrMoV steel - Google Patents
Thermal treatment process of piston of rock drill made of 35CrMoV steel Download PDFInfo
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- CN104073813A CN104073813A CN201410288660.4A CN201410288660A CN104073813A CN 104073813 A CN104073813 A CN 104073813A CN 201410288660 A CN201410288660 A CN 201410288660A CN 104073813 A CN104073813 A CN 104073813A
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Abstract
The invention relates to a thermal treatment process of a piston of a rock drill made of 35CrMoV steel. The process comprises the following steps: 1, forging a blank; 2, annealing; 3, performing mechanical processing; 4, carburizing to directly quench; 5, tempering at high temperature; 6, quenching for the second time; 7, washing; 8, tempering; 9, blasting sand; and 10, grinding to obtain a finished product. Therefore, the depth of a carbonization layer of the piston made through the thermal treatment process is 1.7-1.9mm, the surface hardness of an article is 60-64HRC, the hardness of a center part of a test sample of a same furnace is 50-52HRC, and the carbonization tissue is invisible tempered martensite and granular carbide.
Description
Technical field
The present invention relates to a kind of thermal treatment process of mining machinery part, specifically 35CrMoV steel rock drill piston thermal treatment process.
Background technology
Mining machinery and boring mechanic are worked crying under severe environmental conditions, wherein most of part bears the effect of the complex stresses such as greater impact power and wearing and tearing and reciprocating rotating, bending, distortion, therefore, these parts generally adopt low-carbon alloy steel making, use through carburizing and quenching, tempering afterloading unit.
Hydraulic drill is being brought into play very important effect in rock engineering, piston in the course of the work, its termination repeated stock drill steel or bore bit, because contact fatigue is very easily peeled off, or there is depression, when sunken end face to a certain extent, piston significantly reduces and scraps because of efficiency.Outer surface of piston coordinates in cylinder body, in the course of the work, the mutual friction of mating surface phase, in the time may wear to target efficiency and significantly decline, piston failure and scrapping, or spline falls piece; Under intense impact repeatedly, sometimes in undesired inefficacies such as large and small round transition position fractures; Therefore, the performance quality of impactor piston is directly connected to the use of rock drill.
Summary of the invention
The present invention is directed to above-mentioned technical problem 35CrMoV steel rock drill piston thermal treatment process is provided.Be intended to improve its heart portion intensity and overcome termination depression and spline easily collapses tooth phenomenon, while case depth can reduce.
The present invention adopts following scheme: 35CrMoV steel rock drill piston thermal treatment process, comprises following step:
Step 1, blank forging;
Step 2, annealing;
Step 3, mechanical workout;
Step 4, carburizing direct quenching;
Step 5, high tempering;
Step 6, secondary quenching;
Step 7, cleaning;
Step 8, tempering;
Step 9, sandblast;
Step 10, be ground to finished product.
Forging annealing: in chamber type electric resistance furnace after 840-860 DEG C of insulation burnt thoroughly, furnace cooling to the 300 DEG C air cooling of coming out of the stove below.
Described carburizing adopts gas cementation, 850 DEG C of pre-carburizing 1-2h in RQ3-75-9 type gas carbruizing furance, then be warming up to 900 DEG C of carburizings and reach infiltration layer requirement, and furnace temperature is down to and is applicable to 860 DEG C of direct quenching subsequently, cooling in the oil of quenching after soaking.
Described high tempering: thoroughly burn rear air cooling in 600-650 DEG C of insulation in box resistance furnace.
Described secondary quenching: the heat penetration that adds at 850 DEG C burns, oil quenchinng.
Clean: in cleaning machine, spray cleans.
Described tempering: in well formula resistance furnace in 180-200 DEG C, insulation 1.5h after air cooling.
Beneficial effect of the present invention:
The case depth of the piston of this thermal treatment process of process manufacture is 1.7-1.9mm; Surface hardness in kind is 60-64HRC, is 50-52HRC with stove sample centre hardness; Carburized structure is hidden pin tempered martensite+granular carbide.
Embodiment
Lower mask body elaborates to 35CrMoV steel rock drill piston thermal treatment process of the present invention.
35CrMoV steel rock drill piston thermal treatment process, comprises following step:
Step 1, blank forging;
Step 2, annealing;
Step 3, mechanical workout;
Step 4, carburizing direct quenching;
Step 5, high tempering;
Step 6, secondary quenching;
Step 7, cleaning;
Step 8, tempering;
Step 9, sandblast;
Step 10, be ground to finished product.
Forging annealing: in RX3-60-9 chamber type electric resistance furnace after 840-860 DEG C of insulation burnt thoroughly, furnace cooling to the 300 DEG C air cooling of coming out of the stove below.
Described carburizing adopts gas cementation, 850 DEG C of pre-carburizing 1-2h in RQ3-75-9 type gas carbruizing furance, be intended to be pre-formed tiny carbide particle, for being particulate state distribution, follow-up high temperature carburizing process carbide lays the foundation, be warming up to again 900 DEG C of carburizings and reach infiltration layer requirement, furnace temperature is down to and is applicable to 860 DEG C of direct quenching subsequently, cooling in the oil of quenching after soaking.
Described high tempering: thoroughly burn rear air cooling in 600-650 DEG C of insulation in RX3-60-9 box resistance furnace.Be intended to make carbide to be gathered into granular uniformly, and thoroughly eliminate quenching stress, for secondary quenching lays the foundation.
Described secondary quenching: the heat penetration that adds at 850 DEG C burns, oil quenchinng.
Clean: in cleaning machine, spray cleans.
Described tempering: in well formula resistance furnace in 180-200 DEG C, insulation 1.5h after air cooling.
Further, in order to eliminate the impact of grinding stress, at 170 DEG C of timeliness 8h.
Result: be 1.7-1.9mm with stove sample case depth; Surface hardness in kind is 60-64HRC, is 50-52HRC with stove sample centre hardness; Carburized structure is hidden pin tempered martensite+granular carbide.
Claims (7)
1. a 35CrMoV steel rock drill piston thermal treatment process, is characterized in that, comprises following step:
Step 1, blank forging;
Step 2, annealing;
Step 3, mechanical workout;
Step 4, carburizing direct quenching;
Step 5, high tempering;
Step 6, secondary quenching;
Step 7, cleaning;
Step 8, tempering;
Step 9, sandblast;
Step 10, be ground to finished product.
2. 35CrMoV steel rock drill piston thermal treatment process according to claim 1, is characterized in that, forging annealing: in chamber type electric resistance furnace after 840-860 DEG C of insulation burnt thoroughly, furnace cooling to the 300 DEG C air cooling of coming out of the stove below.
3. 35CrMoV steel rock drill piston thermal treatment process according to claim 1, it is characterized in that, described carburizing adopts gas cementation, 850 DEG C of pre-carburizing 1-2h in RQ3-75-9 type gas carbruizing furance, be warming up to again 900 DEG C of carburizings and reach infiltration layer requirement, furnace temperature is down to and is applicable to 860 DEG C of direct quenching subsequently, cooling in the oil of quenching after soaking.
4. 35CrMoV steel rock drill piston thermal treatment process according to claim 1, is characterized in that described high tempering: in box resistance furnace, thoroughly burn rear air cooling in 600-650 DEG C of insulation.
5. 35CrMoV steel rock drill piston thermal treatment process according to claim 1, is characterized in that described secondary quenching: the heat penetration that adds at 850 DEG C burns, oil quenchinng.
6. 35CrMoV steel rock drill piston thermal treatment process according to claim 1, is characterized in that, cleans: in cleaning machine, spray cleans.
7. 35CrMoV steel rock drill piston thermal treatment process according to claim 1, is characterized in that described tempering: in well formula resistance furnace in 180-200 DEG C, insulation 1.5h after air cooling.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410288660.4A CN104073813A (en) | 2014-06-26 | 2014-06-26 | Thermal treatment process of piston of rock drill made of 35CrMoV steel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410288660.4A CN104073813A (en) | 2014-06-26 | 2014-06-26 | Thermal treatment process of piston of rock drill made of 35CrMoV steel |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104073813A true CN104073813A (en) | 2014-10-01 |
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| CN201410288660.4A Pending CN104073813A (en) | 2014-06-26 | 2014-06-26 | Thermal treatment process of piston of rock drill made of 35CrMoV steel |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105369260A (en) * | 2015-11-19 | 2016-03-02 | 张家港市广大机械锻造有限公司 | Carburizing heat treatment technique for 8620H gear steel |
| CN107470629A (en) * | 2017-08-30 | 2017-12-15 | 湖南顶立科技有限公司 | One kind increases material component Technology for Heating Processing |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103341743A (en) * | 2013-07-08 | 2013-10-09 | 河北华北柴油机有限责任公司 | Anti-cracking machining method of small axial surface carburizing and hardening stepped shaft with end face provided with groove |
-
2014
- 2014-06-26 CN CN201410288660.4A patent/CN104073813A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103341743A (en) * | 2013-07-08 | 2013-10-09 | 河北华北柴油机有限责任公司 | Anti-cracking machining method of small axial surface carburizing and hardening stepped shaft with end face provided with groove |
Non-Patent Citations (1)
| Title |
|---|
| 马伯龙: "《热处理工艺设计与选择》", 31 May 2013, article ""35CrMoV钢制凿岩机活塞的热处理工艺设计"", pages: 239-240 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105369260A (en) * | 2015-11-19 | 2016-03-02 | 张家港市广大机械锻造有限公司 | Carburizing heat treatment technique for 8620H gear steel |
| CN107470629A (en) * | 2017-08-30 | 2017-12-15 | 湖南顶立科技有限公司 | One kind increases material component Technology for Heating Processing |
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Application publication date: 20141001 |