CN107350730A - A kind of processing technology of valve seat - Google Patents
A kind of processing technology of valve seat Download PDFInfo
- Publication number
- CN107350730A CN107350730A CN201610302570.5A CN201610302570A CN107350730A CN 107350730 A CN107350730 A CN 107350730A CN 201610302570 A CN201610302570 A CN 201610302570A CN 107350730 A CN107350730 A CN 107350730A
- Authority
- CN
- China
- Prior art keywords
- blank
- valve seat
- carburizing
- completion
- sent
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
- B23P15/001—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass valves or valve housings
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Forging (AREA)
Abstract
The present invention discloses a kind of processing technology of valve seat, comprises the following steps：(1) blank is carried out after the completion of blank (2) blank heating heats to 1150~1250 DEG C (3) under hot forging punching (4) blank be sent into batch-type furnace carry out normalized treatment (5) by blank deliver to lathe rough turn (6) it is rough turn after blank delivered into numerically controlled lathe smart car and blank is carried out after (7) smart car of carving characters be sent into polishing machine polishing (9) finishing stock external diameter (10) on polishing machine after carburizing, Quenching Treatment (8) blank surface carburizing clean blank, sealing ring is covered, completes the processing of valve seat finished product.The valve seat precision that the present invention processes is high, good airproof performance, and pass through the multi-steps such as hot forging, normalizing, carburizing, quenching, improve the intensity of valve base surface and valve element, the yield strength of valve seat is greatly improved, when for plunger pump, bigger pressure can be born, it will not be deformed when being suppressed, cause the sealing of plunger pump to be affected.
Description
Technical field
The invention belongs to parts machining field, specifically a kind of processing technology of valve seat.
Background technology
Valve seat is detachable face component in valve, for supporting valve element closed positions, and forms sealing pair.General valve seat is straight
Footpath is valve maximum flow diameter.Plunger pump is an important device of hydraulic system, and it is past in cylinder body by plunger
Multiple motion, the volume of seal operation cavity volume is set to change to realize oil suction, force feed, plunger will move back and forth in cylinder body,
Therefore, its amount of exercise is very big, therefore, plunger pump be particularly be used for shale gas exploitation plunger pump, because working strength compared with
Height, larger pressure difference is had inside and outside pump, to prevent the liquid leakage in the pump housing, to the intensity of each parts on the pump housing
It is required that it is all higher, and to be got well with the fitness of pump body.For the valve seat of plunger pump, good airproof performance is not required nothing more than, together
When compression strength also to valve seat itself and hardness improve higher requirement.
The content of the invention
Goal of the invention：Present invention aims in view of the shortcomings of the prior art, there is provided a kind of intensity is high, the valve of good airproof performance
The processing technology of seat.
Technical scheme：The processing technology of valve seat of the present invention, comprises the following steps：
(1) blank under, saw and expect by specification requirement, and inspection of weighing, every 3~3.1kg of billet weight；
(2) blank, which is sent into intermediate frequency furnace, is heated to 1150~1250 DEG C, heats beat 10~20s/ parts；
(3) heat after the completion of to blank carry out hot forging scale removal, 960 DEG C of forging temperature ＞, fire consumption 1~1.1%,
Blank is sent into punch press punching after hot forging；
(4) blank is sent into batch-type furnace and carries out normalized treatment after the completion of step (3), and uniform lift in-furnace temperature is extremely
930~950 DEG C, and 180 minutes are incubated, blank is hung out into burner hearth afterwards, carries out air cooling, blank grain size is 5~8 grades,
Banded structure >=3 grade, case hardness HB159~201；
(5) blank is delivered to large and small external diameter and the aperture of the rough turn blank of lathe, break corner is removed in blank both ends of the surface and aperture
Burr, and in the both ends surface chamfer of blank；
(6) blank is delivered into numerically controlled lathe, the large and small end face and aperture of smart car blank, and the milling on blank after rough turn
Seal groove, after the completion of blank is carved characters on quarter machine；
(7) carburizing, Quenching Treatment are carried out after smart car to blank, non-cemented zone applies coating protection, carburized (case) depth
1.8~2.0mm；Case hardness HRC 60~63, core hardness HRC ＞ 32；
(8) polishing machine is sent into after blank surface carburizing, removes blank surface carbon black and permeability-reducing admixture coating, is thrown to blank gold
Belong to primary colors；
(9) the finishing stock external diameter on polishing machine, the taper and gauge contact surface for ensureing blank are more than 80%；
(10) blank is cleaned, covers sealing ring, completes the processing of valve seat finished product.
Further preferably technical scheme is that step (3) described hot forging comprises the following steps to the present invention：
A, after the completion of blank heats in intermediate frequency furnace, ejection, the scale removal under 200T press；
B, blank temperature is maintained at more than 960 DEG C, and finish-forging is carried out under 1000T press；
C, blank feeding 160T punch presses are punched out after the completion of finish-forging.
Preferably, blank shot-peening scale removal in barrel-type shot-blasting machine.
Preferably, carburizing in step (7), Quenching Treatment concretely comprise the following steps：
A, preheat：In blank input shaft furnace, preheated one hour at 370 DEG C；
B, carburizing：Blank is put into pit carburizing furnace, 830 DEG C of tripping in stoves preheat 0.5 hour, and 930 DEG C of exhausts 1.5 are small
When, 930 DEG C of carburizings 5 hours, 930 DEG C spread 9~10 hours, and 930 DEG C cool 3 hours；
C, it is incubated：840 DEG C are incubated 1 hour；
D, quench：840 DEG C are again heated to, is incubated 1.5 hours；
E, it is tempered：160-180 DEG C is tempered 2 hours, comes out of the stove, blank air cooling.
Beneficial effect：Valve seat precision that the present invention processes is high, good airproof performance, and by hot forging, normalizing, carburizing, quench
The multi-steps such as fire, the intensity of valve base surface and valve element is improved, the yield strength of valve seat is greatly improved, for post
When filling in pump, bigger pressure can be born, will not be deformed when being suppressed, cause the sealing of plunger pump by
Influence.
Embodiment
Technical solution of the present invention is described in detail below, but protection scope of the present invention is not limited to the implementation
Example.
Embodiment 1：A kind of processing technology of valve seat, comprises the following steps：
(1) blank under, saw and expect by specification requirement, and inspection of weighing, every 3~3.1kg of billet weight；
(2) blank, which is sent into intermediate frequency furnace, is heated to 1150 DEG C, heats beat 10s/ parts；
(3) hot forging scale removal is carried out to blank after the completion of heating, concretely comprised the following steps：
A, after the completion of blank heats in intermediate frequency furnace, ejection, under 200T press, shot-peening removes in barrel-type shot-blasting machine
Oxide skin；
B, blank temperature is maintained at more than 960 DEG C, and finish-forging, fire consumption 1~1.1% are carried out under 1000T press；
C, blank feeding 160T punch presses are punched out after the completion of finish-forging；
(4) after the completion of step (3) blank be sent into batch-type furnace in carry out normalized treatment, uniform lift in-furnace temperature to 930 DEG C,
And 180 minutes are incubated, and blank is hung out into burner hearth afterwards, carries out air cooling, blank grain size is 5~8 grades, banded structure >=
3 grades, case hardness HB159；
(5) blank is delivered to large and small external diameter and the aperture of the rough turn blank of lathe, break corner is removed in blank both ends of the surface and aperture
Burr, and in the both ends surface chamfer of blank；
(6) blank is delivered into numerically controlled lathe, the large and small end face and aperture of smart car blank, and the milling on blank after rough turn
Seal groove, after the completion of blank is carved characters on quarter machine；
(7) carburizing, Quenching Treatment are carried out after smart car to blank, non-cemented zone applies coating protection, carburized (case) depth 1.8
mm；Case hardness HRC 60, core hardness HRC35, is concretely comprised the following steps：
A, preheat：In blank input shaft furnace, preheated one hour at 370 DEG C；
B, carburizing：Blank is put into pit carburizing furnace, 830 DEG C of tripping in stoves preheat 0.5 hour, and 930 DEG C of exhausts 1.5 are small
When, 930 DEG C of carburizings 5 hours, 930 DEG C spread 9~10 hours, and 930 DEG C cool 3 hours；
C, it is incubated：840 DEG C are incubated 1 hour；
D, quench：840 DEG C are again heated to, is incubated 1.5 hours；
E, it is tempered：160-180 DEG C is tempered 2 hours, comes out of the stove, blank air cooling；
(8) polishing machine is sent into after blank surface carburizing, removes blank surface carbon black and permeability-reducing admixture coating, is thrown to blank gold
Belong to primary colors；
(9) the finishing stock external diameter on polishing machine, the taper and gauge contact surface for ensureing blank are more than 80%；
(10) blank is cleaned, covers sealing ring, completes the processing of valve seat finished product.
Embodiment 2：A kind of processing technology of valve seat, comprises the following steps：
(1) blank under, saw and expect by specification requirement, and inspection of weighing, every 3~3.1kg of billet weight；
(2) blank, which is sent into intermediate frequency furnace, is heated to 1250 DEG C, heats beat 20s/ parts；
(3) hot forging scale removal is carried out to blank after the completion of heating, concretely comprised the following steps：
A, after the completion of blank heats in intermediate frequency furnace, ejection, under 200T press, shot-peening removes in barrel-type shot-blasting machine
Oxide skin；
B, blank temperature is maintained at more than 960 DEG C, and finish-forging, fire consumption 1~1.1% are carried out under 1000T press；
C, blank feeding 160T punch presses are punched out after the completion of finish-forging；
(4) after the completion of step (3) blank be sent into batch-type furnace in carry out normalized treatment, uniform lift in-furnace temperature to 950 DEG C,
And 180 minutes are incubated, and blank is hung out into burner hearth afterwards, carries out air cooling, blank grain size is 5~8 grades, banded structure >=
3 grades, case hardness HB180；
(5) blank is delivered to large and small external diameter and the aperture of the rough turn blank of lathe, break corner is removed in blank both ends of the surface and aperture
Burr, and in the both ends surface chamfer of blank；
(6) blank is delivered into numerically controlled lathe, the large and small end face and aperture of smart car blank, and the milling on blank after rough turn
Seal groove, after the completion of blank is carved characters on quarter machine；
(7) carburizing, Quenching Treatment are carried out after smart car to blank, non-cemented zone applies coating protection, carburized (case) depth 1.9
mm；Case hardness HRC 62, core hardness HRC37, is concretely comprised the following steps：
A, preheat：In blank input shaft furnace, preheated one hour at 370 DEG C；
B, carburizing：Blank is put into pit carburizing furnace, 830 DEG C of tripping in stoves preheat 0.5 hour, and 930 DEG C of exhausts 1.5 are small
When, 930 DEG C of carburizings 5 hours, 930 DEG C spread 9~10 hours, and 930 DEG C cool 3 hours；
C, it is incubated：840 DEG C are incubated 1 hour；
D, quench：840 DEG C are again heated to, is incubated 1.5 hours；
E, it is tempered：160-180 DEG C is tempered 2 hours, comes out of the stove, blank air cooling；
(8) polishing machine is sent into after blank surface carburizing, removes blank surface carbon black and permeability-reducing admixture coating, is thrown to blank gold
Belong to primary colors；
(9) the finishing stock external diameter on polishing machine, the taper and gauge contact surface for ensureing blank are more than 80%；
(10) blank is cleaned, covers sealing ring, completes the processing of valve seat finished product.
Embodiment 3：A kind of processing technology of valve seat, comprises the following steps：
(1) blank under, saw and expect by specification requirement, and inspection of weighing, every 3~3.1kg of billet weight；
(2) blank, which is sent into intermediate frequency furnace, is heated to 1200 DEG C, heats beat 14s/ parts；
(3) hot forging scale removal is carried out to blank after the completion of heating, concretely comprised the following steps：
A, after the completion of blank heats in intermediate frequency furnace, ejection, under 200T press, shot-peening removes in barrel-type shot-blasting machine
Oxide skin；
B, blank temperature is maintained at more than 960 DEG C, and finish-forging, fire consumption 1~1.1% are carried out under 1000T press；
C, blank feeding 160T punch presses are punched out after the completion of finish-forging；
(4) after the completion of step (3) blank be sent into batch-type furnace in carry out normalized treatment, uniform lift in-furnace temperature to 940 DEG C,
And 180 minutes are incubated, and blank is hung out into burner hearth afterwards, carries out air cooling, blank grain size is 5~8 grades, banded structure >=
3 grades, case hardness HB201；
(5) blank is delivered to large and small external diameter and the aperture of the rough turn blank of lathe, break corner is removed in blank both ends of the surface and aperture
Burr, and in the both ends surface chamfer of blank；
(6) blank is delivered into numerically controlled lathe, the large and small end face and aperture of smart car blank, and the milling on blank after rough turn
Seal groove, after the completion of blank is carved characters on quarter machine；
(7) carburizing, Quenching Treatment are carried out after smart car to blank, non-cemented zone applies coating protection, carburized (case) depth 2.0
mm；Case hardness HRC 63, core hardness HRC41, is concretely comprised the following steps：
A, preheat：In blank input shaft furnace, preheated one hour at 370 DEG C；
B, carburizing：Blank is put into pit carburizing furnace, 830 DEG C of tripping in stoves preheat 0.5 hour, and 930 DEG C of exhausts 1.5 are small
When, 930 DEG C of carburizings 5 hours, 930 DEG C spread 9~10 hours, and 930 DEG C cool 3 hours；
C, it is incubated：840 DEG C are incubated 1 hour；
D, quench：840 DEG C are again heated to, is incubated 1.5 hours；
E, it is tempered：160-180 DEG C is tempered 2 hours, comes out of the stove, blank air cooling；
(8) polishing machine is sent into after blank surface carburizing, removes blank surface carbon black and permeability-reducing admixture coating, is thrown to blank gold
Belong to primary colors；
(9) the finishing stock external diameter on polishing machine, the taper and gauge contact surface for ensureing blank are more than 80%；
(10) blank is cleaned, covers sealing ring, completes the processing of valve seat finished product.
Table 1 is the properties of product of the embodiment of the present invention 1~3 and the correction data of existing product performance
As described above, although the present invention has been represented and described with reference to specific preferred embodiment, but it shall not be construed as
To the limitation of itself of the invention., can be right under the premise of the spirit and scope of the present invention that appended claims define are not departed from
Various changes can be made in the form and details for it.
Claims (4)
1. a kind of processing technology of valve seat, it is characterised in that comprise the following steps：
(1) blank under, saw and expect by specification requirement, and inspection of weighing, every 3~3.1kg of billet weight；
(2) blank, which is sent into intermediate frequency furnace, is heated to 1150~1250 DEG C, heats beat 10~20s/ parts；
(3) heat after the completion of to blank carry out hot forging scale removal, 960 DEG C of forging temperature ＞, fire consumption 1~1.1%,
Blank is sent into punch press punching after hot forging；
(4) blank is sent into batch-type furnace and carries out normalized treatment after the completion of step (3), and uniform lift in-furnace temperature is extremely
930~950 DEG C, and 180 minutes are incubated, blank is hung out into burner hearth afterwards, carries out air cooling, blank grain size is 5~8 grades,
Banded structure >=3 grade, case hardness HB159~201；
(5) blank is delivered to large and small external diameter and the aperture of the rough turn blank of lathe, break corner is removed in blank both ends of the surface and aperture
Burr, and in the both ends surface chamfer of blank；
(6) blank is delivered into numerically controlled lathe, the large and small end face and aperture of smart car blank, and the milling on blank after rough turn
Seal groove, after the completion of blank is carved characters on quarter machine；
(7) carburizing, Quenching Treatment are carried out after smart car to blank, non-cemented zone applies coating protection, carburized (case) depth
1.8~2.0mm；Case hardness HRC 60~63, core hardness HRC ＞ 32；
(8) polishing machine is sent into after blank surface carburizing, removes blank surface carbon black and permeability-reducing admixture coating, is thrown to blank gold
Belong to primary colors；
(9) the finishing stock external diameter on polishing machine, the taper and gauge contact surface for ensureing blank are more than 80%；
(10) blank is cleaned, covers sealing ring, completes the processing of valve seat finished product.
2. the processing technology of valve seat according to claim 1, it is characterised in that step (3) described hot forging includes
Following steps：
A, after the completion of blank heats in intermediate frequency furnace, ejection, the scale removal under 200T press；
B, blank temperature is maintained at more than 960 DEG C, and finish-forging is carried out under 1000T press；
C, blank feeding 160T punch presses are punched out after the completion of finish-forging.
3. the processing technology of valve seat according to claim 2, it is characterised in that blank is in barrel-type shot-blasting machine
Shot-peening scale removal.
4. the processing technology of valve seat according to claim 1, it is characterised in that carburizing, quenching in step (7)
Processing concretely comprises the following steps：
A, preheat：In blank input shaft furnace, preheated one hour at 370 DEG C；
B, carburizing：Blank is put into pit carburizing furnace, 830 DEG C of tripping in stoves preheat 0.5 hour, and 930 DEG C of exhausts 1.5 are small
When, 930 DEG C of carburizings 5 hours, 930 DEG C spread 9~10 hours, and 930 DEG C cool 3 hours；
C, it is incubated：840 DEG C are incubated 1 hour；
D, quench：840 DEG C are again heated to, is incubated 1.5 hours；
E, it is tempered：160-180 DEG C is tempered 2 hours, comes out of the stove, blank air cooling.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610302570.5A CN107350730A (en) | 2016-05-09 | 2016-05-09 | A kind of processing technology of valve seat |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610302570.5A CN107350730A (en) | 2016-05-09 | 2016-05-09 | A kind of processing technology of valve seat |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107350730A true CN107350730A (en) | 2017-11-17 |
Family
ID=60270978
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610302570.5A Pending CN107350730A (en) | 2016-05-09 | 2016-05-09 | A kind of processing technology of valve seat |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107350730A (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108526823A (en) * | 2018-04-12 | 2018-09-14 | 盐城易动科技服务有限公司 | A method of valve seat is processed using welding procedure |
| CN108581366A (en) * | 2018-08-08 | 2018-09-28 | 玉环诺仕橡胶制品有限公司 | A kind of processing technology of miniature valve seat |
| CN109304407A (en) * | 2018-12-04 | 2019-02-05 | 中国航发贵州红林航空动力控制科技有限公司 | A kind of valve base sealing annulus impact forming method |
| CN110153650A (en) * | 2019-04-30 | 2019-08-23 | 沈阳透平机械股份有限公司 | The processing method of the saddle-shaped groove blade seat of large-scale axial flow type compressor |
| CN112658615A (en) * | 2020-12-22 | 2021-04-16 | 通州建总起重设备安装有限公司 | Machining method for valve seat of overflow valve |
| CN113560814A (en) * | 2021-04-26 | 2021-10-29 | 徐州新大隆化工泵业制造有限公司 | Processing technology of high-strength plunger pump check valve |
| CN115283951A (en) * | 2022-10-08 | 2022-11-04 | 张家港富瑞阀门有限公司 | Butterfly valve metal valve seat machining tool and butterfly valve metal valve seat machining method |
| CN115466895A (en) * | 2022-10-19 | 2022-12-13 | 自贡兆强密封制品实业有限公司 | Wear-resistant corrosion-resistant oil pump valve seat and machining method |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1068912A2 (en) * | 1999-07-13 | 2001-01-17 | Kabushiki-Kaisha Kotani | Hypoid ring gear for differentials and method of producing the same |
| CN102534374A (en) * | 2012-02-16 | 2012-07-04 | 无锡市万邦机械制造厂 | Method for processing rectangular-tooth spline sleeve using 42CrMoE high-quality alloy steel as material |
| CN102528406A (en) * | 2012-03-13 | 2012-07-04 | 江国辉 | Method for processing automobile synchronizer gear ring blank |
| CN102581574A (en) * | 2012-03-20 | 2012-07-18 | 江国辉 | Method for machining inner gear rings |
| CN103567729A (en) * | 2012-08-05 | 2014-02-12 | 韦光东 | Hub extrusion die casting manufacturing process |
| CN104924027A (en) * | 2015-05-08 | 2015-09-23 | 常州东风轴承有限公司 | Manufacturing method of oil guide cover for vehicle transmission double clutch |
-
2016
- 2016-05-09 CN CN201610302570.5A patent/CN107350730A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1068912A2 (en) * | 1999-07-13 | 2001-01-17 | Kabushiki-Kaisha Kotani | Hypoid ring gear for differentials and method of producing the same |
| CN102534374A (en) * | 2012-02-16 | 2012-07-04 | 无锡市万邦机械制造厂 | Method for processing rectangular-tooth spline sleeve using 42CrMoE high-quality alloy steel as material |
| CN102528406A (en) * | 2012-03-13 | 2012-07-04 | 江国辉 | Method for processing automobile synchronizer gear ring blank |
| CN102581574A (en) * | 2012-03-20 | 2012-07-18 | 江国辉 | Method for machining inner gear rings |
| CN103567729A (en) * | 2012-08-05 | 2014-02-12 | 韦光东 | Hub extrusion die casting manufacturing process |
| CN104924027A (en) * | 2015-05-08 | 2015-09-23 | 常州东风轴承有限公司 | Manufacturing method of oil guide cover for vehicle transmission double clutch |
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108526823A (en) * | 2018-04-12 | 2018-09-14 | 盐城易动科技服务有限公司 | A method of valve seat is processed using welding procedure |
| CN108581366A (en) * | 2018-08-08 | 2018-09-28 | 玉环诺仕橡胶制品有限公司 | A kind of processing technology of miniature valve seat |
| CN108581366B (en) * | 2018-08-08 | 2019-10-01 | 玉环诺仕橡胶制品有限公司 | A kind of processing technology of miniature valve seat |
| CN109304407A (en) * | 2018-12-04 | 2019-02-05 | 中国航发贵州红林航空动力控制科技有限公司 | A kind of valve base sealing annulus impact forming method |
| CN110153650A (en) * | 2019-04-30 | 2019-08-23 | 沈阳透平机械股份有限公司 | The processing method of the saddle-shaped groove blade seat of large-scale axial flow type compressor |
| CN110153650B (en) * | 2019-04-30 | 2020-11-27 | 沈阳透平机械股份有限公司 | Method for processing saddle groove blade seat of large axial flow compressor |
| CN112658615A (en) * | 2020-12-22 | 2021-04-16 | 通州建总起重设备安装有限公司 | Machining method for valve seat of overflow valve |
| CN113560814A (en) * | 2021-04-26 | 2021-10-29 | 徐州新大隆化工泵业制造有限公司 | Processing technology of high-strength plunger pump check valve |
| CN115283951A (en) * | 2022-10-08 | 2022-11-04 | 张家港富瑞阀门有限公司 | Butterfly valve metal valve seat machining tool and butterfly valve metal valve seat machining method |
| CN115283951B (en) * | 2022-10-08 | 2023-02-17 | 张家港富瑞阀门有限公司 | Butterfly valve metal valve seat machining tool and butterfly valve metal valve seat machining method |
| CN115466895A (en) * | 2022-10-19 | 2022-12-13 | 自贡兆强密封制品实业有限公司 | Wear-resistant corrosion-resistant oil pump valve seat and machining method |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN107350730A (en) | A kind of processing technology of valve seat | |
| CN105132637B (en) | Mould double quenching tempering local strengthening Technology for Heating Processing on hydraulic press 5CrMnMo | |
| CN105643219A (en) | Machining technology for gear shaft | |
| CN106964948A (en) | A kind of processing technology of marine gear | |
| CN104070334B (en) | A kind of manufacturing process of bevel gear | |
| CN113564320B (en) | Heat treatment method of G13Cr4Mo4Ni4V steel for aeroengine bearing | |
| CN110193580A (en) | A kind of H13 material forging mold technique | |
| CN105734231A (en) | Heat treatment process for H13 steel | |
| CN101524813B (en) | Waste heat hardening and tempering process of motorcycle crank forged piece | |
| CN107350728B (en) | A kind of production technology of the high-intensitive bushing for plunger pump | |
| CN104942192B (en) | The processing technology of dredge pump axle bearing set | |
| CN105695703A (en) | Heat treatment process for die steel | |
| CN105132857A (en) | Low carbon steel part and composite heat treatment method thereof | |
| CN107350735A (en) | A kind of processing method of pump cover | |
| CN107350726A (en) | A kind of production method of stuffing nut | |
| CN114251378B (en) | Hot die forging press clutch friction disc and friction disc adhesive riveting process | |
| CN105414906A (en) | High-strength and high-precision hub shaft machining method | |
| CN105755262A (en) | Lathe main shaft heat treatment process | |
| CN115896434A (en) | Method for reducing heat treatment deformation of high-carbon chromium steel bearing ring | |
| CN104328250A (en) | Heat treatment process of bearing steel | |
| CN107350725A (en) | A kind of processing technology of stuffing nut | |
| CN107350738A (en) | A kind of production technology of plug screw for plunger pump | |
| CN105986275A (en) | Method for producing wheel gear by 20CrMnTi carburizing steel | |
| CN105436824A (en) | Machining method for sieve plate | |
| CN206069947U (en) | A kind of Technology for Heating Processing of gearing shaft |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20171117 |
|
| RJ01 | Rejection of invention patent application after publication |