CN113231585B - Forging process for stainless steel gasoline 500bar high-pressure oil rail - Google Patents
Forging process for stainless steel gasoline 500bar high-pressure oil rail Download PDFInfo
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- CN113231585B CN113231585B CN202110476696.5A CN202110476696A CN113231585B CN 113231585 B CN113231585 B CN 113231585B CN 202110476696 A CN202110476696 A CN 202110476696A CN 113231585 B CN113231585 B CN 113231585B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
- B21J5/00—Methods for forging, hammering, or pressing; Special equipment or accessories therefor
- B21J5/002—Hybrid process, e.g. forging following casting
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
- B21J5/00—Methods for forging, hammering, or pressing; Special equipment or accessories therefor
- B21J5/06—Methods for forging, hammering, or pressing; Special equipment or accessories therefor for performing particular operations
- B21J5/08—Upsetting
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21K—MAKING FORGED OR PRESSED METAL PRODUCTS, e.g. HORSE-SHOES, RIVETS, BOLTS OR WHEELS
- B21K29/00—Arrangements for heating or cooling during processing
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21K—MAKING FORGED OR PRESSED METAL PRODUCTS, e.g. HORSE-SHOES, RIVETS, BOLTS OR WHEELS
- B21K3/00—Making engine or like machine parts not covered by sub-groups of B21K1/00; Making propellers or the like
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C22/00—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C22/05—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions
- C23C22/06—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous acidic solutions with pH less than 6
- C23C22/48—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous acidic solutions with pH less than 6 not containing phosphates, hexavalent chromium compounds, fluorides or complex fluorides, molybdates, tungstates, vanadates or oxalates
- C23C22/50—Treatment of iron or alloys based thereon
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
- C23G1/00—Cleaning or pickling metallic material with solutions or molten salts
- C23G1/02—Cleaning or pickling metallic material with solutions or molten salts with acid solutions
- C23G1/08—Iron or steel
- C23G1/085—Iron or steel solutions containing HNO3
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Forging (AREA)
Abstract
The invention relates to a forging process for a stainless steel gasoline 500bar high-pressure oil rail, which comprises the following steps: (1) inspecting the raw materials; (2) Forging qualified raw materials to prepare the high-pressure oil rail, which comprises the following steps: blanking, heating and blanking, pre-forging, finish forging, trimming, air cooling, shot blasting, heat treatment welding, hot upsetting, cold upsetting and acid washing; (3) And (5) carrying out product inspection on the product obtained by forging, and cleaning and packaging the qualified product. The process of the invention adopts special processes of air cooling, heat treatment welding, hot upsetting, cold upsetting and penetration flaw detection to ensure the product performance aiming at the characteristics of sensitization temperature of stainless steel materials, no magnetism of the materials and the like.
Description
Technical Field
The invention relates to the technical field of high-pressure oil rail manufacturing, in particular to a forging process for a stainless steel gasoline 500bar high-pressure oil rail.
Background
The stainless steel high-pressure oil rail of the gasoline engine is formed by assembling and welding parts, and along with the gradual improvement of the national requirements on automobile emission, each automobile manufacturer meets the emission requirements by reducing the discharge capacity and improving the working pressure of the engine. With the improvement of the working pressure of the engine, the reliability and fatigue resistance of the oil rail in an assembled and welded mode can be greatly reduced under the condition that the working pressure is higher than 250bar, and the oil rail can pose a threat to a user. So the oil rail with the working pressure above 250bar is mostly in the form of integral forging machine.
At present, the working pressure of a fuel system of a four-generation EA888 engine in China of a public group is 350bar, and a high-pressure oil rail is added to the whole stainless steel forging machine. The fifth generation EA888 engine fuel system operating pressure is raised to 500bar, which will further increase the current 350bar rail body performance. However, the conventional stainless steel oil rail forging process cannot meet the durability and long-time corrosion resistance of the rail body under the working pressure of 500 bar.
Disclosure of Invention
The invention aims to solve the problems and provide a forging process for a 500bar high-pressure oil rail of stainless steel gasoline, so as to obtain the 500bar high-pressure stainless steel gasoline high-pressure oil rail and meet the use requirements of practical application.
The aim of the invention is achieved by the following technical scheme:
a forging process for a stainless steel gasoline 500bar high-pressure oil rail comprises the following steps:
(1) Checking the raw materials;
(2) Forging qualified raw materials to prepare the high-pressure oil rail, which comprises the following steps: blanking, heating and blanking, pre-forging, finish forging, trimming, air cooling, shot blasting, heat treatment welding, hot upsetting, cold upsetting and acid washing;
(3) And (5) carrying out product inspection on the product obtained by forging, and cleaning and packaging the qualified product.
The process of the invention adopts the special processes of air cooling, hot upsetting, cold upsetting and penetration flaw detection to ensure the product performance aiming at the characteristics of sensitization temperature of stainless steel materials, no magnetism of the materials and the like.
Further, the step (1) of inspecting the raw material includes a low-power tissue inspection, a nonmetallic inclusion inspection, and a chemical composition analysis.
Further, the blanking in the step (2) is to cut and blanking the bar stock according to the standard length through a circular saw or a band saw.
Further, the heating blank-making temperature in the step (2) is 1100-1300, preferably 1200 ℃.
Further, the product shape is forged by the pre-forging and the finish forging, and the trimming is cutting off the product flash.
Further, the shot blasting is to remove black skin on the surface of the product.
Further, the hot-heading treatment is to heat-heading treatment of the plug end of the high-pressure oil rail, and local hardness is higher than that of the rail body through local material hot extrusion hardening, so that the hardness is more than HB210.
Further, the cold heading treatment is to the oil inlet end cold heading treatment of the high-pressure oil rail, and the hardness of the oil inlet end cold heading treatment is higher than the hardness of the rail body through local material cold extrusion hardening, wherein the hardness is more than HB300.
Further, the corrosion resistance of the rail body is improved by carrying out surface passivation treatment through acid washing, and the specific flow of the acid washing is as follows:
(1) Pickling with 15-20% HNO3+5-8% HF, industrial water for 25min without heating;
(2) Pickling with 15-20% HNO3+5-8% HF, industrial water for 25min without heating;
(3) Washing with water, industrial water for 3-5min, and removing acid;
(4) Passivating by 35-40% HNO3+8-10% HF for 30min without heating;
(5) Washing with water, industrial water for 3-5min, and removing acid;
(6) Washing with water, industrial water for 3-5min, and removing acid;
(7) Washing with deionized water for 3-5min, and removing acid;
(8) Washing with hot water, heating to 80-90deg.C with deionized water for 3-5min, and accelerating the subsequent air drying and dewatering;
(9) And (5) drying and naturally airing.
Further, the product inspection is carried out on the product obtained by forging in a penetration flaw detection mode, and the product cleaning is carried out by ultrasonic cleaning.
Compared with the prior art, the invention is used for forging the stainless steel gasoline high-pressure oil rail, the sensitization temperature of the stainless steel is 480-820 ℃, the cooling is accelerated by adopting air cooling, and the hardness of the rail body is HB140-190. Because the stainless steel is free from magnetism after being soluted, the stainless steel cannot be detected by a diesel oil rail magnetic particle inspection method, and the surface quality is detected by adopting a penetration inspection method. The hot heading process achieves that the local hardness is higher than that of the rail body through the hot extrusion hardening of the local material, and the hardness is more than HB210; the cold heading process is to realize that the local hardness is higher than that of the rail body through the cold extrusion hardening of the local material, and the hardness is more than HB300; and the rail body is subjected to surface passivation treatment through acid washing, so that the corrosion resistance of the rail body is improved.
Drawings
FIG. 1 is a process flow diagram of the present invention.
Detailed Description
The invention will now be described in detail with reference to the drawings and specific examples.
As shown in fig. 1, a forging process for a stainless steel gasoline 500bar high-pressure oil rail comprises the following steps:
(1) Checking the raw materials;
(2) Forging qualified raw materials to prepare the high-pressure oil rail, which comprises the following steps: blanking, heating and blanking, pre-forging, finish forging, trimming, air cooling, shot blasting, heat treatment welding, hot upsetting, cold upsetting and acid washing;
(3) And (5) carrying out product inspection on the product obtained by forging, and cleaning and packaging the qualified product.
Step (1) of inspecting the raw material includes a low-power tissue inspection, a nonmetallic inclusion inspection, and a chemical composition analysis.
And (2) cutting and blanking the bar stock according to the standard length by a circular saw or a band saw.
And (3) heating the blank to 1200 ℃.
The product shape is forged by the pre-forging and the finish forging, and the trimming is cutting off the product flash.
The shot blasting is to remove black skin on the surface of the product.
The hot-heading treatment is to heat-heading treatment of the plug end of the high-pressure oil rail, and local hardness is higher than that of the rail body through local material hot extrusion hardening, so that the hardness is more than HB210.
The cold heading treatment is to cold heading the oil inlet end of the high-pressure oil rail, and the hardness of the oil inlet end is higher than that of the rail body by local material cold extrusion hardening, wherein the hardness is more than HB300.
The rail body corrosion resistance is improved by carrying out surface passivation treatment through acid washing, and the specific flow of acid washing is as follows:
(1) Pickling with 15-20% HNO3+5-8% HF, industrial water for 25min without heating;
(2) Pickling with 15-20% HNO3+5-8% HF, industrial water for 25min without heating;
(3) Washing with water, industrial water for 3-5min, and removing acid;
(4) Passivating by 35-40% HNO3+8-10% HF for 30min without heating;
(5) Washing with water, industrial water for 3-5min, and removing acid;
(6) Washing with water, industrial water for 3-5min, and removing acid;
(7) Washing with deionized water for 3-5min, and removing acid;
(8) Washing with hot water, heating to 80-90deg.C with deionized water for 3-5min, and accelerating the subsequent air drying and dewatering;
(9) And (5) drying and naturally airing.
And (3) carrying out product inspection on the product obtained by forging in a penetration flaw detection mode, and cleaning the product by ultrasonic waves. The stainless steel sensitization temperature of the invention is 480-820 ℃, air cooling is adopted to accelerate cooling, the hardness of the rail body is HB140-190, and a penetration flaw detection method is adopted to detect the surface quality. The hot heading process achieves that the local hardness is higher than that of the rail body through the hot extrusion hardening of the local material, and the hardness is more than HB210; the cold heading process is to realize that the local hardness is higher than that of the rail body through the cold extrusion hardening of the local material, and the hardness is more than HB300; and the rail body is subjected to surface passivation treatment through acid washing, so that the corrosion resistance of the rail body is improved.
The previous description of the embodiments is provided to facilitate a person of ordinary skill in the art in order to make and use the present invention. It will be apparent to those skilled in the art that various modifications can be readily made to these embodiments and the generic principles described herein may be applied to other embodiments without the use of the inventive faculty. Therefore, the present invention is not limited to the above-described embodiments, and those skilled in the art, based on the present disclosure, should make improvements and modifications without departing from the scope of the present invention.
Claims (2)
1. The forging process for the stainless steel gasoline 500bar high-pressure oil rail is characterized by comprising the following steps of:
(1) Checking the raw materials;
(2) Forging qualified raw materials to prepare the high-pressure oil rail, which comprises the following steps: blanking, heating and blanking, pre-forging, finish forging, trimming, air cooling, shot blasting, heat treatment welding, hot upsetting, cold upsetting and acid washing;
(3) Product inspection is carried out on the product obtained by forging, and the inspected qualified product is cleaned and packaged;
the hot-heading treatment is to heat heading treatment of the plug end of the high-pressure oil rail, and local hardness is higher than that of the rail body through local material hot extrusion hardening, so that the hardness is more than HB210;
the cold heading treatment is to cold heading the oil inlet end of the high-pressure oil rail, and the hardness of the oil inlet end is higher than that of the rail body by local material cold extrusion hardening, wherein the hardness is more than HB300;
step (1) the raw materials are inspected, including a low-power tissue inspection, a nonmetallic inclusion inspection and a chemical component analysis;
the blanking in the step (2) is to cut and blanking bar stock according to standard length by a circular saw or a band saw;
the heating blank making temperature in the step (2) is 1100-1300 ℃;
the product shape is forged by the pre-forging and the finish forging, and the trimming is cutting off the product flash;
the shot blasting is to remove black skin on the surface of the product;
the rail body corrosion resistance is improved by carrying out surface passivation treatment through acid washing, and the specific flow of acid washing is as follows:
(1) Acid washing with 15-20% HNO 3 +5 to 8% of HF, industrial water, 25 minutes, and heating;
(2) Acid washing with 15-20% HNO 3 +5 to 8% of HF, industrial water, 25 minutes, and heating;
(3) Washing with water, industrial water for 3-5min, and removing acid;
(4) Passivation is carried out by adopting 35-40% HNO 3 +8 to 10% HF for 30min without heating;
(5) Washing with water, industrial water for 3-5min, and removing acid;
(6) Washing with water, industrial water for 3-5min, and removing acid;
(7) Washing with water, deionized water for 3-5min, and removing acid;
(8) Washing with hot water, heating to 80-90 ℃ with deionized water for 3-5min, and accelerating subsequent air drying and dehydration;
(9) And (5) drying and naturally airing.
2. The forging process for the stainless steel gasoline 500bar high-pressure oil rail according to claim 1, wherein the product obtained by forging is subjected to product inspection in a penetration flaw detection mode, and the product is cleaned by ultrasonic cleaning.
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| CN202110476696.5A CN113231585B (en) | 2021-04-29 | 2021-04-29 | Forging process for stainless steel gasoline 500bar high-pressure oil rail |
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| CN202110476696.5A CN113231585B (en) | 2021-04-29 | 2021-04-29 | Forging process for stainless steel gasoline 500bar high-pressure oil rail |
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| CN113231585B true CN113231585B (en) | 2023-08-01 |
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| JP3992977B2 (en) * | 2001-12-25 | 2007-10-17 | 株式会社パーカーコーポレーション | Surface finishing method after descaling of stainless steel |
| US9132567B2 (en) * | 2007-03-23 | 2015-09-15 | Dayton Progress Corporation | Tools with a thermo-mechanically modified working region and methods of forming such tools |
| CN102941447B (en) * | 2012-11-22 | 2015-09-16 | 河南航天精工制造有限公司 | A kind of manufacturing processing technic of bolt |
| CN203285591U (en) * | 2013-04-30 | 2013-11-13 | 成都威特电喷有限责任公司 | Gasoline direct injection fuel machine high pressure fuel rail |
| DE102014102452A1 (en) * | 2014-02-25 | 2015-08-27 | Vallourec Deutschland Gmbh | Process for the production of hot rolled, seamless tubes of transformable steel, in particular for pipelines for deep water applications and related pipes |
| CN104801934A (en) * | 2015-04-28 | 2015-07-29 | 东风（十堰）汽车管业有限公司 | Method for reducing hardness of upset head of high-pressure oil pipe for engine |
| CN107299295B (en) * | 2017-06-08 | 2018-10-09 | 上海威克迈龙川汽车发动机零件有限公司 | The moulding process of the oily rail of super-pressure stainless steel forging and stamping |
| CN107287404A (en) * | 2017-07-01 | 2017-10-24 | 贵州航天精工制造有限公司 | A kind of GH159 bolt heads processing method |
| CN108406315A (en) * | 2018-04-27 | 2018-08-17 | 上海众源燃油分配器制造有限公司 | A kind of gasoline high pressure oil rail forging system and technique |
| CN109236650B (en) * | 2018-09-25 | 2021-03-26 | 宁波甬微集团有限公司 | Rotor type refrigeration compressor pump body |
| CN210141179U (en) * | 2018-12-11 | 2020-03-13 | 上海威克迈龙川汽车发动机零件有限公司 | High-pressure oil rail assembly of engine |
| CN109483188A (en) * | 2019-01-14 | 2019-03-19 | 郑州工商学院 | A kind of technique manufacturing half shaft with flange plate with steel pipe |
| CN212898757U (en) * | 2020-03-05 | 2021-04-06 | 上海威克迈龙川汽车发动机零件有限公司 | Stainless steel fuel high-pressure oil pipe |
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