CN111270065B - Heat treatment process for perforated valve box - Google Patents
Heat treatment process for perforated valve box Download PDFInfo
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- CN111270065B CN111270065B CN202010084833.6A CN202010084833A CN111270065B CN 111270065 B CN111270065 B CN 111270065B CN 202010084833 A CN202010084833 A CN 202010084833A CN 111270065 B CN111270065 B CN 111270065B
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- valve box
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/0068—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for particular articles not mentioned below
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/78—Combined heat-treatments not provided for above
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- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Heat Treatment Of Articles (AREA)
Abstract
The invention discloses a heat treatment process of a valve box with holes, wherein the holes are cross through holes and are positioned in the valve box, and the heat treatment process comprises the following steps: step 1: processing the processed valve box into a cross through hole; step 2: performing preliminary heat treatment: normalizing the valve box, and performing spray treatment in the cross through holes during normalizing and cooling; and step 3: performing preliminary heat treatment: tempering the valve box; and 4, step 4: quenching and tempering heat treatment: quenching the valve box, and spraying water in the cross through holes during quenching and cooling; and 5: quenching and tempering heat treatment: tempering the valve box; the tempering treatment is divided into a first tempering treatment and a second tempering treatment. According to the heat treatment process of the valve box with the holes, the cross through holes are processed before heat treatment, the problem that the heat treatment effect of the cross through holes is poor is effectively solved, and the service life of the valve box is prolonged.
Description
Technical Field
The invention relates to the technical field of mechanical manufacturing, in particular to a heat treatment process of a perforated valve box.
Background
34CrNi3The MoV perforated valve box is used as a core part of a drilling pump, low-pressure liquid is sucked into the valve box in the using process, high pressure is discharged through the action of a plunger, and the circulation of the liquid is realized, so that the requirement on the performance of an inner hole working surface is very high. The conventional tempering process is to temper the whole workpiece, and the cross-shaped through holes are machined in a machining mode after tempering, the heat treatment mode is influenced by the hardenability of the material, the cooling speed in the valve box is low, and the treatment effect is poor, so that the service life of the valve box is influenced.
Disclosure of Invention
In view of the defects, the invention provides a heat treatment process of a perforated valve box, which is used for solving the problem that the service life of the valve box is influenced due to poor treatment effect inside the valve box.
The invention provides a heat treatment process of a valve box with holes, wherein the holes are cross through holes and are positioned in the valve box, and the heat treatment process comprises the following steps:
step 1: processing a cross through hole in the molded valve box;
step 2: normalizing the valve box, and performing spray treatment in the cross through holes during normalizing and cooling;
and step 3: tempering the valve box;
and 4, step 4: quenching the valve box, and spraying water in the cross through holes during quenching and cooling;
and 5: and tempering the valve box.
Preferably, the normalizing process in step 2 comprises the following steps: in the environment of less than or equal to 400 ℃, the temperature is firstly increased to 670 ℃ at the speed of less than or equal to 60 ℃/h, after 10 hours of keeping, the temperature is secondly increased to 860 ℃ for 15 hours, and then air cooling is adopted.
Preferably, the mist in step 2 is formed by atomizing water droplets by high-pressure gas blowing.
Preferably, the tempering treatment in step 3 comprises the following steps: in the environment of less than or equal to 300 ℃, after the temperature is firstly increased to 300 ℃ and kept for 4h, the temperature is secondly increased to 680 ℃ at the speed of less than or equal to 60 ℃/h and kept for 30h, and then the cooling is carried out at the speed of less than or equal to 30 ℃/h.
Preferably, the quenching process in step 4 is as follows: in the environment of less than or equal to 400 ℃, the temperature is firstly increased to 670 ℃ at the speed of less than or equal to 60 ℃/h, after 10 hours of keeping, the temperature is secondly increased to 860 ℃ for 15 hours, and then water cooling is adopted.
Preferably, the tempering treatment in step 5 includes a first tempering treatment and a second tempering treatment
Further, the process of the first tempering treatment in step 5 is as follows: in the environment of less than or equal to 300 ℃, after the temperature is firstly increased to 300 ℃ and kept for 4h, the temperature is secondly increased to 600 ℃ at the speed of less than or equal to 60 ℃/h and kept for 30h, and then water cooling is adopted.
Further, the second tempering treatment in step 5 comprises the following steps: in the environment of less than or equal to 300 ℃, after the temperature is firstly increased to 300 ℃ and kept for 4h, the temperature is secondly increased to 450 ℃ at the speed of less than or equal to 60 ℃/h and kept for 15h, and then the cooling is carried out at the speed of less than or equal to 30 ℃/h.
Further, the temperature increase rate of the second temperature increase may be freely set as needed.
Further, the temperature increase rate of the second temperature increase may be freely set as needed.
Preferably, the valve housing in the step 1 is formed through a forging process.
Further, the forging process includes a forging process and a post-forging heat treatment process.
According to the heat treatment process of the valve box with the holes, the cross through holes are processed before heat treatment, the problem that the heat treatment effect of the cross through holes is poor is effectively solved, excellent organization and performance can be effectively guaranteed to be obtained in the cross through holes in the valve box, and therefore the service life of the valve box is greatly prolonged.
Drawings
In order to more clearly illustrate the technical solution of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a front view of the present ported valve box;
FIG. 2 is a sectional view of the perforated valve box taken along the direction A;
FIG. 3 is a graph of a normalizing process profile of a preheat treatment;
FIG. 4 is a graph of a tempering process of a pre-heat treatment;
FIG. 5 is a quenching process graph of a thermal refining process;
FIG. 6 is a graph of a first tempering process of the thermal refining;
FIG. 7 is a graph showing a second tempering process of the quenching and tempering heat treatment.
Description of the element reference numerals
1 cross through hole
2 valve box
Detailed Description
The following description of the embodiments of the present invention is provided for illustrative purposes, and other advantages and effects of the present invention will become apparent to those skilled in the art from the present disclosure.
It should be understood that the structures, ratios, sizes, and the like shown in the drawings and described in the specification are only used for matching with the disclosure of the specification, so as to be understood and read by those skilled in the art, and are not used to limit the conditions under which the present invention can be implemented, so that the present invention has no technical significance, and any structural modification, ratio relationship change, or size adjustment should still fall within the scope of the present invention without affecting the efficacy and the achievable purpose of the present invention. In addition, the terms "upper", "lower", "left", "right", "middle" and "one" used in the present specification are for clarity of description, and are not intended to limit the scope of the present invention, and the relative relationship between the terms and the terms is not to be construed as a scope of the present invention.
As shown in fig. 1-2, the present invention provides a heat treatment process for a valve box with holes, wherein the holes are cross through holes 1 and are positioned inside the valve box 2, and the heat treatment process comprises the following steps:
step 1: a cross through hole 1 is processed in the molded valve box 2;
step 2: normalizing the valve box 2, spraying in the cross-shaped through holes 1 during normalizing and cooling, refining the inner hole structure, improving the inner hole quality, and laying a foundation for rapid quenching and cooling in subsequent tempering, wherein the fog is formed by spraying and atomizing water drops by high-pressure gas.
And step 3: tempering the valve box 2;
and 4, step 4: quenching the valve box 2, and spraying water in the cross through holes 1 during quenching and cooling, so that the cooling speed of the inner hole is increased, and the hardening and tempering effect is ensured;
and 5: tempering the valve box 2; the tempering treatment comprises a first tempering treatment and a second tempering treatment, wherein the first tempering treatment adopts water cooling to eliminate tempering brittleness, and the second tempering treatment eliminates residual stress.
According to the heat treatment process of the valve box 2 with the holes, the cross through holes 1 are processed before heat treatment, the problem that the heat treatment effect of the cross through holes 1 is poor is effectively solved, and the service life of the valve box 2 is prolonged.
As an example of the present invention, the normalizing process in step 2 is: in the environment of less than or equal to 400 ℃, firstly heating to 670 ℃ at the speed of less than or equal to 60 ℃/h, keeping for 10h, then heating to 860 ℃ for 15h, and then cooling by air cooling, wherein the heating speed of the second heating can be freely set according to the requirement.
As an example of the present invention, the tempering process in step 3 is: in the environment of less than or equal to 300 ℃, after the temperature is firstly increased to 300 ℃ and kept for 4h, the temperature is secondly increased to 680 ℃ at the speed of less than or equal to 60 ℃/h and kept for 30h, and then the cooling is carried out at the speed of less than or equal to 30 ℃/h.
As an example of the present invention, the quenching process in step 4 is: in the environment of less than or equal to 400 ℃, the temperature is firstly increased to 670 ℃ at the speed of less than or equal to 60 ℃/h, after 10h of maintenance, the temperature is secondly increased to 860 ℃ for 15h of maintenance, and then water cooling is adopted, wherein the temperature increase speed of the second temperature increase can be freely set according to the requirement.
As an example of the present invention, the process of the first tempering treatment in step 5 is: in the environment of less than or equal to 300 ℃, after the temperature is firstly increased to 300 ℃ and kept for 4h, the temperature is secondly increased to 600 ℃ at the speed of less than or equal to 60 ℃/h and kept for 30h, and then water cooling is adopted.
As an example of the present invention, the process of the second tempering treatment in step 5 is: in the environment of less than or equal to 300 ℃, after the temperature is firstly increased to 300 ℃ and kept for 4h, the temperature is secondly increased to 450 ℃ at the speed of less than or equal to 60 ℃/h and kept for 15h, and then the cooling is carried out at the speed of less than or equal to 30 ℃/h.
As an example of the present invention, the valve housing in step 1 is formed through a forging process.
As an example of the present invention, the forging process includes a forging process and a post-forging heat treatment process.
The foregoing embodiments are merely illustrative of the principles and utilities of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or change the above-mentioned embodiments without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which can be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.
Claims (7)
1. A heat treatment process for a valve box with holes, wherein the holes are criss-cross through holes and are positioned inside the valve box, and the heat treatment process comprises the following steps:
step 1: processing the cross through hole on the molded valve box;
step 2: normalizing the valve box, and performing spray treatment in the cross through holes during normalizing and cooling;
and step 3: tempering the valve box;
and 4, step 4: quenching the valve box, and spraying water in the cross through holes during quenching and cooling;
and 5: tempering the valve box; the tempering treatment comprises a first tempering treatment and a second tempering treatment; the first tempering treatment process comprises the following steps: in the environment of less than or equal to 300 ℃, after the temperature is firstly increased to 300 ℃ and kept for 4 hours, the temperature is increased to 600 ℃ for the second time at the speed of less than or equal to 60 ℃/h and kept for 30 hours, and then water cooling is adopted; the process of the second tempering treatment comprises the following steps: in the environment of less than or equal to 300 ℃, after the temperature is firstly increased to 300 ℃ and kept for 4h, the temperature is secondly increased to 450 ℃ at the speed of less than or equal to 60 ℃/h and kept for 15h, and then the cooling is carried out at the speed of less than or equal to 30 ℃/h.
2. The heat treatment process for the perforated valve box according to claim 1, wherein: the normalizing process in the step 2 comprises the following steps: in the environment of less than or equal to 400 ℃, the temperature is firstly increased to 670 ℃ at the speed of less than or equal to 60 ℃/h, after 10 hours of keeping, the temperature is secondly increased to 860 ℃ for 15 hours, and then air cooling is adopted.
3. The heat treatment process for the perforated valve box according to claim 1, wherein: in the step 2, the mist is formed by spraying and atomizing water drops by high-pressure gas.
4. The heat treatment process for the perforated valve box according to claim 1, wherein: the tempering treatment process in the step 3 comprises the following steps: in the environment of less than or equal to 300 ℃, after the temperature is firstly increased to 300 ℃ and kept for 4h, the temperature is secondly increased to 680 ℃ at the speed of less than or equal to 60 ℃/h and kept for 30h, and then the cooling is carried out at the speed of less than or equal to 30 ℃/h.
5. The heat treatment process for the perforated valve box according to claim 1, wherein: the quenching treatment process in the step 4 comprises the following steps: in the environment of less than or equal to 400 ℃, the temperature is firstly increased to 670 ℃ at the speed of less than or equal to 60 ℃/h, after 10 hours of keeping, the temperature is secondly increased to 860 ℃ for 15 hours, and then water cooling is adopted.
6. The heat treatment process for the perforated valve box according to claim 1, wherein: and (2) forming the valve box in the step (1) through a forging process.
7. The heat treatment process for the perforated valve box according to claim 6, wherein: the forging process comprises a forging process and a post-forging heat treatment process.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010084833.6A CN111270065B (en) | 2020-02-10 | 2020-02-10 | Heat treatment process for perforated valve box |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010084833.6A CN111270065B (en) | 2020-02-10 | 2020-02-10 | Heat treatment process for perforated valve box |
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| CN111270065A CN111270065A (en) | 2020-06-12 |
| CN111270065B true CN111270065B (en) | 2022-03-22 |
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| CN113960166A (en) * | 2021-10-15 | 2022-01-21 | 江苏裕隆锻造有限公司 | Manufacturing and inspection method of 34CrNi3MoV valve box forging stock |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20070251287A1 (en) * | 2004-06-30 | 2007-11-01 | Posco Technical Research Laboratories | Hot rolled strip cooling device with coolant header |
| CN201587964U (en) * | 2009-12-16 | 2010-09-22 | 齐齐哈尔二机床(集团)有限责任公司 | Dip-spray and quenching device for die of cold heading machine |
| CN104946870A (en) * | 2015-07-02 | 2015-09-30 | 杭州汽轮动力集团有限公司 | Heat treatment method for strength of 28CrMoNiV steel capable of improving industrial steam turbine rotor forge piece |
| CN108754121A (en) * | 2018-06-13 | 2018-11-06 | 江苏大学 | A kind of devices and methods therefor that hole wall laser peening Compound Extrusion is strengthened |
-
2020
- 2020-02-10 CN CN202010084833.6A patent/CN111270065B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20070251287A1 (en) * | 2004-06-30 | 2007-11-01 | Posco Technical Research Laboratories | Hot rolled strip cooling device with coolant header |
| CN201587964U (en) * | 2009-12-16 | 2010-09-22 | 齐齐哈尔二机床(集团)有限责任公司 | Dip-spray and quenching device for die of cold heading machine |
| CN104946870A (en) * | 2015-07-02 | 2015-09-30 | 杭州汽轮动力集团有限公司 | Heat treatment method for strength of 28CrMoNiV steel capable of improving industrial steam turbine rotor forge piece |
| CN108754121A (en) * | 2018-06-13 | 2018-11-06 | 江苏大学 | A kind of devices and methods therefor that hole wall laser peening Compound Extrusion is strengthened |
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| CN111270065A (en) | 2020-06-12 |
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Denomination of invention: A Heat Treatment Process for Perforated Valve Boxes Effective date of registration: 20230323 Granted publication date: 20220322 Pledgee: Yucheng Branch of Agricultural Bank of China Ltd. Pledgor: TONGYU HEAVY INDUSTRY Co.,Ltd. Registration number: Y2023980035948 |
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