CN112658615A - Machining method for valve seat of overflow valve - Google Patents
Machining method for valve seat of overflow valve Download PDFInfo
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- CN112658615A CN112658615A CN202011530748.4A CN202011530748A CN112658615A CN 112658615 A CN112658615 A CN 112658615A CN 202011530748 A CN202011530748 A CN 202011530748A CN 112658615 A CN112658615 A CN 112658615A
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- valve seat
- overflow valve
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Abstract
The invention discloses a machining method of a valve seat of an overflow valve, which comprises the following steps: A. firstly, fixing an overflow valve seat on an operation platform of a drilling and milling machine; B. turning the valve seat of the overflow valve at a low rotating speed by using a turning tool; C. then, drilling a valve seat of the overflow valve by using a drill bit, and machining a threaded hole by using a tapping drill bit after drilling; D. then, polishing and chamfering the edge of the valve seat of the overflow valve by using a polishing disc; E. and finally, performing high-temperature heat treatment on the valve seat of the overflow valve, wherein the processing method adopted by the invention is simple to operate, and the valve seat of the overflow valve with high hardness and high pressure resistance can be obtained, so that the service life of the overflow valve is effectively prolonged.
Description
Technical Field
The invention relates to the technical field of machining of valve seats of overflow valves, in particular to a machining method of a valve seat of an overflow valve.
Background
The overflow valve is a hydraulic pressure control valve, and mainly plays the roles of constant pressure overflow, pressure stabilization, system unloading and safety protection in hydraulic equipment. When the overflow valve is assembled or used, due to the damage of an O-shaped sealing ring and a combined sealing ring, or the looseness of a mounting screw and a pipe joint, unnecessary external leakage can be caused.
The overflow valve needs to be installed on a valve seat when being installed, and the existing valve seat has low hardness and poor pressure resistance and wear resistance, so that improvement is needed.
Disclosure of Invention
The invention aims to provide a machining method for a valve seat of an overflow valve, which aims to solve the problems in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme: a machining method for a valve seat of an overflow valve comprises the following steps:
A. firstly, fixing an overflow valve seat on an operation platform of a drilling and milling machine;
B. turning the valve seat of the overflow valve at a low rotating speed by using a turning tool;
C. then, drilling a valve seat of the overflow valve by using a drill bit, and machining a threaded hole by using a tapping drill bit after drilling;
D. then, polishing and chamfering the edge of the valve seat of the overflow valve by using a polishing disc;
E. and finally, carrying out high-temperature heat treatment on the valve seat of the overflow valve.
Preferably, the turning rate in the step B is 400-500 r/min.
Preferably, the rotating speed of the drill in the step C is 1800-2100 r/min, and the feeding speed of the drill is 150-170 mm/min.
Preferably, the rotation speed of the tapping drill in the step C is 1400-1600 r/min, and the feeding speed of the tapping drill is 120-140 mm/min.
Preferably, the high-temperature heat treatment method in step E is as follows:
a. heating a high-temperature furnace, wherein the amount of propane introduced in the heating process is 0.15L/h, when the temperature of a heating chamber rises to 800-880 ℃, the amount of propane introduced is 0.25L/h, the amount of standard air is 30L/h, and then keeping the temperature constant for 20 min;
b. then heating the radiant tube of the high-temperature furnace at full power, wherein the temperature is increased to 920-940 ℃, the introduced propane amount is 0.15L/h, the standard air amount is 30L/h, and the carbon potential is 1.1-1.3;
c. then, diffusion is carried out, the diffusion temperature is 950 ℃ to 965 ℃, and the carbon potential drop is 0.85 to 0.95;
d. then cooling and maintaining the carbon potential.
Preferably, in the step d, the temperature is reduced to 720-730 ℃, the heat preservation time is 20-40 min, and the carbon potential is kept at 0.85-0.95.
Compared with the prior art, the invention has the beneficial effects that: the processing method adopted by the invention is simple to operate, and can obtain the high-hardness and high-pressure-resistant overflow valve seat, thereby effectively prolonging the service life of the overflow valve; the high-temperature heat treatment method effectively improves the hardness, strength and wear resistance of the overflow valve seat, and prolongs the service life of the overflow valve seat.
Detailed Description
The technical solutions in the embodiments of the present invention are clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The first embodiment is as follows:
the invention provides the following technical scheme: a machining method for a valve seat of an overflow valve comprises the following steps:
A. firstly, fixing an overflow valve seat on an operation platform of a drilling and milling machine;
B. turning the valve seat of the overflow valve at a low rotating speed by using a turning tool;
C. then, drilling a valve seat of the overflow valve by using a drill bit, and machining a threaded hole by using a tapping drill bit after drilling;
D. then, polishing and chamfering the edge of the valve seat of the overflow valve by using a polishing disc;
E. and finally, carrying out high-temperature heat treatment on the valve seat of the overflow valve.
In this embodiment, the turning rate in step B is 400 r/min.
In this embodiment, the rotation speed of the drill in step C is 1800r/min, and the feed speed of the drill is 150 mm/min.
In this embodiment, the rotation speed of the tapping drill in step C is 1400r/min, and the feeding speed of the tapping drill is 120 mm/min.
In this embodiment, the high temperature heat treatment method in step E is as follows:
a. heating the high-temperature furnace, wherein the propane amount is 0.15L/h in the heating process, when the temperature of the heating chamber is increased to 800 ℃, the propane amount is 0.25L/h, the standard air is 30L/h, and then keeping the temperature constant for 20 min;
b. then heating the radiant tube of the high-temperature furnace at full power, wherein the temperature is increased to 920 ℃, the introduced propane amount is 0.15L/h, the standard air amount is 30L/h, and the carbon potential is 1.1;
c. then, diffusion is carried out, wherein the diffusion temperature is 950 ℃, and the carbon potential drop is 0.85;
d. then cooling and maintaining the carbon potential.
In this embodiment, in step d, the temperature is lowered to 720 ℃, the holding time is 20min, and the carbon potential is maintained at 0.85.
Example two:
a machining method for a valve seat of an overflow valve comprises the following steps:
A. firstly, fixing an overflow valve seat on an operation platform of a drilling and milling machine;
B. turning the valve seat of the overflow valve at a low rotating speed by using a turning tool;
C. then, drilling a valve seat of the overflow valve by using a drill bit, and machining a threaded hole by using a tapping drill bit after drilling;
D. then, polishing and chamfering the edge of the valve seat of the overflow valve by using a polishing disc;
E. and finally, carrying out high-temperature heat treatment on the valve seat of the overflow valve.
In this embodiment, the turning rate in step B is 500 r/min.
In this embodiment, the rotation speed of the drill in step C is 2100r/min, and the feed speed of the drill is 170 mm/min.
In this embodiment, the rotation speed of the tapping drill in step C is 1600r/min, and the feeding speed of the tapping drill is 140 mm/min.
In this embodiment, the high temperature heat treatment method in step E is as follows:
a. heating a high-temperature furnace, wherein the amount of propane introduced in the heating process is 0.15L/h, when the temperature of a heating chamber rises to 800-880 ℃, the amount of propane introduced is 0.25L/h, the amount of standard air is 30L/h, and then keeping the temperature constant for 20 min;
b. then heating the radiant tube of the high-temperature furnace at full power, wherein the temperature is increased to 940 ℃, the introduced propane amount is 0.15L/h, the standard air amount is 30L/h, and the carbon potential is 1.3;
c. then, diffusion is carried out, wherein the diffusion temperature is 965 ℃, and the carbon potential drop is 0.95;
d. then cooling and maintaining the carbon potential.
In this example, the temperature in step d was reduced to 730 ℃, the holding time was 40min, and the carbon potential was maintained at 0.95.
Example three:
a machining method for a valve seat of an overflow valve comprises the following steps:
A. firstly, fixing an overflow valve seat on an operation platform of a drilling and milling machine;
B. turning the valve seat of the overflow valve at a low rotating speed by using a turning tool;
C. then, drilling a valve seat of the overflow valve by using a drill bit, and machining a threaded hole by using a tapping drill bit after drilling;
D. then, polishing and chamfering the edge of the valve seat of the overflow valve by using a polishing disc;
E. and finally, carrying out high-temperature heat treatment on the valve seat of the overflow valve.
In this embodiment, the turning rate in step B is 420 r/min.
In this embodiment, the rotation speed of the drill in step C is 1900r/min, and the feed speed of the drill is 155 mm/min.
In this embodiment, the rotation speed of the tap bit in step C is 1450r/min, and the feed speed of the tap bit is 125 mm/min.
In this embodiment, the high temperature heat treatment method in step E is as follows:
a. heating the high-temperature furnace, wherein the propane amount is 0.15L/h in the heating process, when the temperature of the heating chamber is increased to 820 ℃, the propane amount is 0.25L/h, the standard air is 30L/h, and then keeping the temperature constant for 20 min;
b. then heating the radiant tube of the high-temperature furnace at full power, wherein the temperature is raised to 925 ℃, the introduced propane amount is 0.15L/h, the standard air amount is 30L/h, and the carbon potential is 1.1;
c. then, diffusion is carried out, wherein the diffusion temperature is 955 ℃, and the carbon potential drop is 0.86;
d. then cooling and maintaining the carbon potential.
In this example, the temperature in step d was reduced to 722 ℃, the holding time was 25min, and the carbon potential was maintained at 0.86.
Example four:
a machining method for a valve seat of an overflow valve comprises the following steps:
A. firstly, fixing an overflow valve seat on an operation platform of a drilling and milling machine;
B. turning the valve seat of the overflow valve at a low rotating speed by using a turning tool;
C. then, drilling a valve seat of the overflow valve by using a drill bit, and machining a threaded hole by using a tapping drill bit after drilling;
D. then, polishing and chamfering the edge of the valve seat of the overflow valve by using a polishing disc;
E. and finally, carrying out high-temperature heat treatment on the valve seat of the overflow valve.
In this embodiment, the turning rate in step B is 480 r/min.
In this embodiment, the rotation speed of the drill in step C is 2000r/min, and the feed speed of the drill is 165 mm/min.
In this embodiment, the rotation speed of the tapping drill in step C is 1550r/min, and the feeding speed of the tapping drill is 135 mm/min.
In this embodiment, the high temperature heat treatment method in step E is as follows:
a. heating the high-temperature furnace, wherein the propane amount is 0.15L/h in the heating process, when the temperature of the heating chamber is increased to 870 ℃, the propane amount is 0.25L/h, the standard air is 30L/h, and then keeping the temperature constant for 20 min;
b. then heating the radiant tube of the high-temperature furnace at full power, wherein the temperature is increased to 935 ℃, the introduced propane amount is 0.15L/h, the standard air amount is 30L/h, and the carbon potential is 1.2;
c. then, diffusion is carried out, wherein the diffusion temperature is 960 ℃, and the carbon potential drop is 0.88;
d. then cooling and maintaining the carbon potential.
In this example, in step d, the temperature is lowered to 728 ℃, the holding time is 32min, and the carbon potential is maintained at 0.88.
Example five:
a machining method for a valve seat of an overflow valve comprises the following steps:
A. firstly, fixing an overflow valve seat on an operation platform of a drilling and milling machine;
B. turning the valve seat of the overflow valve at a low rotating speed by using a turning tool;
C. then, drilling a valve seat of the overflow valve by using a drill bit, and machining a threaded hole by using a tapping drill bit after drilling;
D. then, polishing and chamfering the edge of the valve seat of the overflow valve by using a polishing disc;
E. and finally, carrying out high-temperature heat treatment on the valve seat of the overflow valve.
In this embodiment, the turning rate in step B is 450 r/min.
In this embodiment, the rotation speed of the drill in step C is 2000r/min, and the feed speed of the drill is 160 mm/min.
In this embodiment, the rotation speed of the tap bit in step C is 1500r/min, and the feed speed of the tap bit is 130 mm/min.
In this embodiment, the high temperature heat treatment method in step E is as follows:
a. heating the high-temperature furnace, wherein the propane amount is 0.15L/h in the heating process, when the temperature of the heating chamber is increased to 840 ℃, the propane amount is 0.25L/h, the standard air is 30L/h, and then keeping the constant temperature for 20 min;
b. then, heating the radiant tube of the high-temperature furnace at full power, wherein the temperature is increased to 930 ℃, the introduced propane amount is 0.15L/h, the standard air amount is 30L/h, and the carbon potential is 1.2;
c. then, diffusion is carried out, wherein the diffusion temperature is 958 ℃, and the carbon potential drop is 0.9;
d. then cooling and maintaining the carbon potential.
In this example, in step d, the temperature was lowered to 725 ℃, the holding time was 30min, and the carbon potential was maintained at 0.9.
In conclusion, the processing method adopted by the invention is simple to operate, and can obtain the high-hardness and high-pressure-resistant overflow valve seat, thereby effectively prolonging the service life of the overflow valve; the high-temperature heat treatment method effectively improves the hardness, strength and wear resistance of the overflow valve seat, and prolongs the service life of the overflow valve seat.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (6)
1. A machining method for a valve seat of an overflow valve is characterized by comprising the following steps: the method comprises the following steps:
A. firstly, fixing an overflow valve seat on an operation platform of a drilling and milling machine;
B. turning the valve seat of the overflow valve at a low rotating speed by using a turning tool;
C. then, drilling a valve seat of the overflow valve by using a drill bit, and machining a threaded hole by using a tapping drill bit after drilling;
D. then, polishing and chamfering the edge of the valve seat of the overflow valve by using a polishing disc;
E. and finally, carrying out high-temperature heat treatment on the valve seat of the overflow valve.
2. The relief valve seat machining method according to claim 1, characterized in that: and the turning speed in the step B is 400-500 r/min.
3. The relief valve seat machining method according to claim 1, characterized in that: and C, the rotating speed of the drill in the step C is 1800-2100 r/min, and the feeding speed of the drill is 150-170 mm/min.
4. The relief valve seat machining method according to claim 1, characterized in that: and C, the rotating speed of the tapping drill bit in the step C is 1400-1600 r/min, and the feeding speed of the tapping drill bit is 120-140 mm/min.
5. The relief valve seat machining method according to claim 1, characterized in that: the high-temperature heat treatment method in the step E comprises the following steps:
a. heating a high-temperature furnace, wherein the amount of propane introduced in the heating process is 0.15L/h, when the temperature of a heating chamber rises to 800-880 ℃, the amount of propane introduced is 0.25L/h, the amount of standard air is 30L/h, and then keeping the temperature constant for 20 min;
b. then heating the radiant tube of the high-temperature furnace at full power, wherein the temperature is increased to 920-940 ℃, the introduced propane amount is 0.15L/h, the standard air amount is 30L/h, and the carbon potential is 1.1-1.3;
c. then, diffusion is carried out, the diffusion temperature is 950 ℃ to 965 ℃, and the carbon potential drop is 0.85 to 0.95;
d. then cooling and maintaining the carbon potential.
6. The relief valve seat machining method according to claim 5, characterized in that: and d, reducing the temperature to 720-730 ℃, keeping the temperature for 20-40 min, and keeping the carbon potential at 0.85-0.95.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011530748.4A CN112658615A (en) | 2020-12-22 | 2020-12-22 | Machining method for valve seat of overflow valve |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011530748.4A CN112658615A (en) | 2020-12-22 | 2020-12-22 | Machining method for valve seat of overflow valve |
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| CN112658615A true CN112658615A (en) | 2021-04-16 |
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| CN202011530748.4A Pending CN112658615A (en) | 2020-12-22 | 2020-12-22 | Machining method for valve seat of overflow valve |
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Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19834133C1 (en) * | 1998-07-29 | 2000-02-03 | Daimler Chrysler Ag | Process for the production of hollow shafts |
| CN103406734A (en) * | 2013-08-22 | 2013-11-27 | 龙工（上海）精工液压有限公司 | Machining method of valve seat of relief valve |
| CN106048510A (en) * | 2016-07-01 | 2016-10-26 | 兴化东华齿轮有限公司 | Compound heat treatment technology for wear-resistant gears |
| CN107350730A (en) * | 2016-05-09 | 2017-11-17 | 南京晨伟机械设备制造有限公司 | A kind of processing technology of valve seat |
| CN107649830A (en) * | 2017-08-21 | 2018-02-02 | 无锡南理工科技发展有限公司 | The manufacture method of integral (type) flange |
| CN109894806A (en) * | 2017-12-11 | 2019-06-18 | 重庆泰奥汽车科技有限公司 | A kind of automobile handware manufacturing method of high rigidity |
| CN110592346A (en) * | 2019-08-30 | 2019-12-20 | 肇庆新华兴实业有限公司 | Stainless steel plate production process |
| CN111730292A (en) * | 2020-06-30 | 2020-10-02 | 浙江金森机械有限公司 | Efficient production process of overflow valve sleeve |
-
2020
- 2020-12-22 CN CN202011530748.4A patent/CN112658615A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19834133C1 (en) * | 1998-07-29 | 2000-02-03 | Daimler Chrysler Ag | Process for the production of hollow shafts |
| CN103406734A (en) * | 2013-08-22 | 2013-11-27 | 龙工（上海）精工液压有限公司 | Machining method of valve seat of relief valve |
| CN107350730A (en) * | 2016-05-09 | 2017-11-17 | 南京晨伟机械设备制造有限公司 | A kind of processing technology of valve seat |
| CN106048510A (en) * | 2016-07-01 | 2016-10-26 | 兴化东华齿轮有限公司 | Compound heat treatment technology for wear-resistant gears |
| CN107649830A (en) * | 2017-08-21 | 2018-02-02 | 无锡南理工科技发展有限公司 | The manufacture method of integral (type) flange |
| CN109894806A (en) * | 2017-12-11 | 2019-06-18 | 重庆泰奥汽车科技有限公司 | A kind of automobile handware manufacturing method of high rigidity |
| CN110592346A (en) * | 2019-08-30 | 2019-12-20 | 肇庆新华兴实业有限公司 | Stainless steel plate production process |
| CN111730292A (en) * | 2020-06-30 | 2020-10-02 | 浙江金森机械有限公司 | Efficient production process of overflow valve sleeve |
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Application publication date: 20210416 |