CN111843403A - Manufacturing process of automobile steering knuckle arm - Google Patents
Manufacturing process of automobile steering knuckle arm Download PDFInfo
- Publication number
- CN111843403A CN111843403A CN202010680198.8A CN202010680198A CN111843403A CN 111843403 A CN111843403 A CN 111843403A CN 202010680198 A CN202010680198 A CN 202010680198A CN 111843403 A CN111843403 A CN 111843403A
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- knuckle arm
- blank
- tempering
- heating
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- 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
- B23P15/14—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass gear parts, e.g. gear wheels
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Forging (AREA)
- Heat Treatment Of Articles (AREA)
Abstract
The invention relates to a manufacturing process of a vehicle steering knuckle arm, which is characterized by comprising the following steps of: s1, feeding, S2, pre-cutting, S3, heating, S4, forging, S5, trimming, S6, thermal correction, S7, tempering, S8, surface shot blasting, S9, flaw detection, S10, paint spraying, S11, machining, S12, full inspection, S13, packaging and warehousing, and the invention has the beneficial effects that: the manufacturing process of the automobile steering knuckle arm is provided, so that the mechanical property of the produced steering knuckle arm is greatly improved, the structure is compact, the safety performance meets the safety design requirement of an automobile, and the size is accurate and meets the use requirement.
Description
Technical Field
The invention relates to the technical field of machining, in particular to a manufacturing process of a vehicle steering knuckle arm.
Background
The existing steering knuckle arm forming process mostly adopts an upsetting method to realize the connection tightness of internal tissues of parts, and compared with a workpiece produced by direct cutting, the upsetting process has multi-section temperature change in the production process, is easy to remain internal stress, causes cracks to be generated, has an internal tissue not tight, and has low safety performance.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a process for manufacturing the vehicle steering knuckle arm, aiming at the defects of the prior art, so that the mechanical property of the produced steering knuckle arm is greatly improved, the structure is compact, the safety performance meets the safety design requirement of the vehicle, and the size is accurate and meets the use requirement.
In order to achieve the purpose, the invention provides the following technical scheme:
a manufacturing process of a vehicle steering knuckle arm is characterized by comprising the following steps:
s1, feeding: selecting low alloy steel with the alloy element proportion not more than 5% as a forging blank;
s2, pre-cutting: a band sawing machine is adopted to initially position the size, and the forging blank in the step S1 is cut into a pre-blank;
s3, heating: heating the pre-blank by adopting an intermediate frequency heating furnace, heating the pre-blank in the step S2 to 380-480 ℃, and then heating to 1110-1170 ℃;
s4, forging: taking out the pre-blank in the step S3, beating and removing a surface oxide layer, drawing the pre-blank by using an air hammer and an upsetting die, then making the drawn pre-blank by using a blank making die and a punch press, and finally processing the made blank by using a forming die and an electric program control screw press so as to obtain a first-stage knuckle arm;
S5, trimming: removing the redundant flash of the first-stage knuckle arm in the step S4;
s6, thermal correction: placing the first-stage knuckle arm in the step S5 into a thermal correction mold for correction;
s7, hardening and tempering: placing the first-stage knuckle arm in the step S6 into a tempering furnace for heat treatment to obtain a second-stage knuckle arm;
s8, shot blasting on the surface: placing the second-stage knuckle arm in the step S7 into a shot blasting machine to remove surface oxide skin, and obtaining the knuckle arm;
s9, flaw detection: flaw detection is carried out on the knuckle arm in the step S8 by adopting a magnetic particle flaw detector;
s10, spray painting: performing surface painting on the knuckle arm in the step S9;
s11, machining: putting the knuckle arm in the step S10 into machining, and punching the knuckle arm;
s12, full inspection: checking the appearance, size and number of the knuckle arm in step S11;
and S13, packaging and warehousing.
By adopting the technical scheme, the mechanical property of the produced knuckle arm is greatly improved, the structure is compact, the safety performance meets the safety design requirement of a vehicle, and the size is accurate and meets the use requirement; wherein, the intermediate frequency furnace is used for heating, the metal plasticity can be improved, the metal deformation resistance is reduced, the metal is easy to form, good organization and mechanical property after forging can be obtained, after forging, the first-stage knuckle arm is continuously corrected and deformed to be beneficial to subsequent machining treatment, after thermal correction, thermal refining is carried out, after thermal refining, the mechanical property can be greatly improved, the organization is compact, the safety performance meets the safety design requirement of vehicles, after thermal refining, the first-stage knuckle arm is put into a shot blasting machine to remove surface oxide skin, flaw detection is carried out on the knuckle arm after surface shot blasting is finished, unqualified products are removed, the standard knuckle arm is subjected to paint spraying treatment, surface oxidation corrosion is delayed, the service life of the knuckle arm is prolonged, and because the forging machining precision is not high, machining finishing is required, to meet the use standard.
The invention further provides that the machining of step S11 includes the following steps:
q1, vehicle plane: selecting a knuckle arm with a shot-blasted surface, and turning planes on two sides of the knuckle arm by using a numerical control lathe;
q2, bore: selecting a turned knuckle arm, machining two mounting holes on one side of the knuckle arm by using a perforating machine until the mounting size is met, and machining a bottom hole on the knuckle arm until the mounting size is met;
q3, taper hole turning: selecting the drilled knuckle arm, and turning the taper hole at the other end of the knuckle arm relative to the mounting hole by using a numerical control lathe until the assembly size is met;
q4, milling plane: selecting the knuckle arm after turning the taper hole, and performing surface finishing on the plane of the knuckle arm by adopting a numerical control lathe;
q5, chamfering and deburring;
q6, rust prevention: and (5) conveying the chamfered knuckle arm into a clear antirust conveyor for cleaning and rust prevention.
By adopting the technical scheme, the surface of the steering knuckle arm after paint spraying is roughly turned to form a reference surface, so that the positioning processing of the hole is facilitated, and the part after chamfer deburring can be prevented from being injured.
The invention is further set that the forging blank is 40CrH alloy structural steel.
By adopting the technical scheme, the tensile strength sigma b (MPa) of the 40CrH alloy structural steel is as follows: 980(100), yield strength σ s (MPa): 785(80) or more, and particularly has good comprehensive mechanical properties, good low-temperature impact toughness and low notch sensitivity after quenching and tempering treatment.
The invention further provides that the hardening and tempering in the step S7 includes the following steps:
f1, preheating: placing the first-stage knuckle arm in a heating furnace to be preheated to 380-480 ℃;
f2, quenching: quenching: continuing to heat the knuckle arm in the step F1 to 840 ℃, preserving heat for 40 minutes, adding methanol to prevent decarburization in the heat preservation process, sending the knuckle arm into a quenching oil bath after finishing heat preservation, and quickly cooling to finish quenching;
f3, tempering: and F2, heating the knuckle arm in the step F2 to 510 +/-10 ℃ at a speed of less than or equal to 5 ℃/min through a mesh belt, directly tempering in a tempering furnace, keeping the temperature for 3-5 h in the tempering furnace, and then air cooling to room temperature.
By adopting the technical scheme, compared with the prior art, the carburizing treatment is not needed, the process is simplified when the quenching and tempering are completed in the mesh belt furnace, the hardening and tempering period is shortened, the temperature distribution of the internal and surface tissues of the knuckle arm can be ensured to be uniform while the production cost is reduced, and the internal stress generated by the temperature difference is reduced; methanol is added in the quenching and heat preservation process, so that the loss of carbon elements of the material is avoided; the tempering process is heated at a speed of less than or equal to 4 ℃/min, so that residual internal stress in the knuckle arm is avoided, and cracks are generated.
The invention is further configured that an infrared temperature sorter is additionally arranged in the step S3 to measure and control the temperature in real time.
By adopting the technical scheme, the infrared temperature sorter is selected, so that the heating temperature can be measured and fed back in real time, and the control of the heating temperature by operators is facilitated.
The invention has the beneficial effects that: by adopting the technical scheme, the mechanical property of the produced knuckle arm is greatly improved, the structure is compact, the safety performance meets the safety design requirement of a vehicle, the size is accurate and meets the use requirement, no residual internal stress exists in the knuckle arm, and cracks are avoided.
The present invention will be described in further detail with reference to examples.
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.
A manufacturing process of a vehicle steering knuckle arm comprises the following steps:
s1, feeding: selecting low alloy steel with the alloy element proportion not more than 5% as a forging blank;
S2, pre-cutting: a band sawing machine is adopted to initially position the size, and the forging blank in the step S1 is cut into a pre-blank;
s3, heating: heating the pre-blank by adopting an intermediate frequency heating furnace, heating the pre-blank in the step S2 to 380-480 ℃, and then heating to 1110-1170 ℃;
s4, forging: taking out the pre-blank in the step S3, beating and removing a surface oxide layer, drawing the pre-blank by using an air hammer and an upsetting die, then making the drawn pre-blank by using a blank making die and a punch press, and finally processing the made blank by using a forming die and an electric program control screw press so as to obtain a first-stage knuckle arm;
s5, trimming: removing the redundant flash of the first-stage knuckle arm in the step S4;
s6, thermal correction: placing the first-stage knuckle arm in the step S5 into a thermal correction mold for correction;
s7, hardening and tempering: placing the first-stage knuckle arm in the step S6 into a tempering furnace for heat treatment to obtain a second-stage knuckle arm;
s8, shot blasting on the surface: placing the second-stage knuckle arm in the step S7 into a shot blasting machine to remove surface oxide skin, and obtaining the knuckle arm;
s9, flaw detection: flaw detection is carried out on the knuckle arm in the step S8 by adopting a magnetic particle flaw detector;
S10, spray painting: performing surface painting on the knuckle arm in the step S9;
s11, machining: putting the knuckle arm in the step S10 into machining, and punching the knuckle arm;
s12, full inspection: checking the appearance, size and number of the knuckle arm in step S11;
and S13, packaging and warehousing.
The machining of the step S11 includes the following steps:
q1, vehicle plane: selecting a knuckle arm with a shot-blasted surface, and turning planes on two sides of the knuckle arm by using a numerical control lathe;
q2, bore: selecting a turned knuckle arm, machining two mounting holes on one side of the knuckle arm by using a perforating machine until the mounting size is met, and machining a bottom hole on the knuckle arm until the mounting size is met;
q3, taper hole turning: selecting the drilled knuckle arm, and turning the taper hole at the other end of the knuckle arm relative to the mounting hole by using a numerical control lathe until the assembly size is met;
q4, milling plane: selecting the knuckle arm after turning the taper hole, and performing surface finishing on the plane of the knuckle arm by adopting a numerical control lathe;
q5, chamfering and deburring;
q6, rust prevention: and (5) conveying the chamfered knuckle arm into a clear antirust conveyor for cleaning and rust prevention.
The forging blank is 40CrH alloy structural steel.
The hardening and tempering in the step S7 comprises the following steps:
f1, preheating: placing the first-stage knuckle arm in a heating furnace to be preheated to 380-480 ℃;
f2, quenching: quenching: continuing to heat the knuckle arm in the step F1 to 840 ℃, preserving heat for 40 minutes, adding methanol to prevent decarburization in the heat preservation process, sending the knuckle arm into a quenching oil bath after finishing heat preservation, and quickly cooling to finish quenching;
f3, tempering: and F2, heating the knuckle arm in the step F2 to 510 +/-10 ℃ at a speed of less than or equal to 5 ℃/min through a mesh belt, directly tempering in a tempering furnace, keeping the temperature for 3-5 h in the tempering furnace, and then air cooling to room temperature.
And in the step S3, an infrared temperature sorter is additionally arranged to measure and control the temperature in real time.
Claims (5)
1. A manufacturing process of a vehicle steering knuckle arm is characterized by comprising the following steps:
s1, feeding: selecting low alloy steel with the alloy element proportion not more than 5% as a forging blank;
s2, pre-cutting: a band sawing machine is adopted to initially position the size, and the forging blank in the step S1 is cut into a pre-blank;
s3, heating: heating the pre-blank by adopting an intermediate frequency heating furnace, heating the pre-blank in the step S2 to 380-480 ℃, and then heating to 1110-1170 ℃;
S4, forging: taking out the pre-blank in the step S3, beating and removing a surface oxide layer, drawing the pre-blank by using an air hammer and an upsetting die, then making the drawn pre-blank by using a blank making die and a punch press, and finally processing the made blank by using a forming die and an electric program control screw press so as to obtain a first-stage knuckle arm;
s5, trimming: removing the redundant flash of the first-stage knuckle arm in the step S4;
s6, thermal correction: placing the first-stage knuckle arm in the step S5 into a thermal correction mold for correction;
s7, hardening and tempering: placing the first-stage knuckle arm in the step S6 into a tempering furnace for heat treatment to obtain a second-stage knuckle arm;
s8, shot blasting on the surface: placing the second-stage knuckle arm in the step S7 into a shot blasting machine to remove surface oxide skin, and obtaining the knuckle arm;
s9, flaw detection: flaw detection is carried out on the knuckle arm in the step S8 by adopting a magnetic particle flaw detector;
s10, spray painting: performing surface painting on the knuckle arm in the step S9;
s11, machining: putting the knuckle arm in the step S10 into machining, and punching the knuckle arm;
s12, full inspection: checking the appearance, size and number of the knuckle arm in step S11;
And S13, packaging and warehousing.
2. The process for manufacturing a knuckle arm for a vehicle according to claim 1, wherein the machining of step S11 comprises the steps of:
q1, vehicle plane: selecting a knuckle arm with a shot-blasted surface, and turning planes on two sides of the knuckle arm by using a numerical control lathe;
q2, bore: selecting a turned knuckle arm, machining two mounting holes on one side of the knuckle arm by using a perforating machine until the mounting size is met, and machining a bottom hole on the knuckle arm until the mounting size is met;
q3, taper hole turning: selecting the drilled knuckle arm, and turning the taper hole at the other end of the knuckle arm relative to the mounting hole by using a numerical control lathe until the assembly size is met;
q4, milling plane: selecting the knuckle arm after turning the taper hole, and performing surface finishing on the plane of the knuckle arm by adopting a numerical control lathe;
q5, chamfering and deburring;
q6, rust prevention: and (5) conveying the chamfered knuckle arm into a clear antirust conveyor for cleaning and rust prevention.
3. The process for manufacturing a knuckle arm for a vehicle according to claim 1, wherein: the forging blank is 40CrH alloy structural steel.
4. The process for manufacturing a knuckle arm for a vehicle according to claim 1, wherein the hardening and tempering in step S7 comprises the steps of:
F1, preheating: placing the first-stage knuckle arm in a heating furnace to be preheated to 380-480 ℃;
f2, quenching: quenching: continuing to heat the knuckle arm in the step F1 to 840 ℃, preserving heat for 40 minutes, adding methanol to prevent decarburization in the heat preservation process, sending the knuckle arm into a quenching oil bath after finishing heat preservation, and quickly cooling to finish quenching;
f3, tempering: and F2, heating the knuckle arm in the step F2 to 510 +/-10 ℃ at a speed of less than or equal to 5 ℃/min through a mesh belt, directly tempering in a tempering furnace, keeping the temperature for 3-5 h in the tempering furnace, and then air cooling to room temperature.
5. The process for manufacturing a knuckle arm for a vehicle according to claim 1, wherein: and in the step S3, an infrared temperature sorter is additionally arranged to measure and control the temperature in real time.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010680198.8A CN111843403A (en) | 2020-07-15 | 2020-07-15 | Manufacturing process of automobile steering knuckle arm |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010680198.8A CN111843403A (en) | 2020-07-15 | 2020-07-15 | Manufacturing process of automobile steering knuckle arm |
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| Publication Number | Publication Date |
|---|---|
| CN111843403A true CN111843403A (en) | 2020-10-30 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010680198.8A Pending CN111843403A (en) | 2020-07-15 | 2020-07-15 | Manufacturing process of automobile steering knuckle arm |
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| CN (1) | CN111843403A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113147289A (en) * | 2021-05-25 | 2021-07-23 | 泰安昊达汽车零部件有限公司 | Traction hook seat for vehicle and manufacturing method |
| CN115194407A (en) * | 2022-07-06 | 2022-10-18 | 湖北三环锻造有限公司 | Machining method of steering knuckle arm |
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| CN101559555A (en) * | 2009-05-19 | 2009-10-21 | 重庆长征重工有限责任公司 | Forging method of coupler knuckle for railway vehicle |
| WO2011120328A1 (en) * | 2010-03-30 | 2011-10-06 | Cao Lixin | Vertical forging method for integral type steering yoke of automobile |
| CN102974742A (en) * | 2012-08-22 | 2013-03-20 | 昌利锻造有限公司 | Processing method of movable fork |
| CN103341740A (en) * | 2013-05-31 | 2013-10-09 | 山东金马工业集团股份有限公司 | Method for preparing electric power steering system hot precision forging section fork |
| CN104148575A (en) * | 2014-07-24 | 2014-11-19 | 浙江昌利锻造有限公司 | Process for forging shifting forks |
| CN111408681A (en) * | 2020-04-13 | 2020-07-14 | 南宫市精强连杆有限公司 | Method for tempering non-quenched and tempered steel connecting rod of engine by using waste heat after forging |
-
2020
- 2020-07-15 CN CN202010680198.8A patent/CN111843403A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101559555A (en) * | 2009-05-19 | 2009-10-21 | 重庆长征重工有限责任公司 | Forging method of coupler knuckle for railway vehicle |
| WO2011120328A1 (en) * | 2010-03-30 | 2011-10-06 | Cao Lixin | Vertical forging method for integral type steering yoke of automobile |
| CN102974742A (en) * | 2012-08-22 | 2013-03-20 | 昌利锻造有限公司 | Processing method of movable fork |
| CN103341740A (en) * | 2013-05-31 | 2013-10-09 | 山东金马工业集团股份有限公司 | Method for preparing electric power steering system hot precision forging section fork |
| CN104148575A (en) * | 2014-07-24 | 2014-11-19 | 浙江昌利锻造有限公司 | Process for forging shifting forks |
| CN111408681A (en) * | 2020-04-13 | 2020-07-14 | 南宫市精强连杆有限公司 | Method for tempering non-quenched and tempered steel connecting rod of engine by using waste heat after forging |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113147289A (en) * | 2021-05-25 | 2021-07-23 | 泰安昊达汽车零部件有限公司 | Traction hook seat for vehicle and manufacturing method |
| CN113147289B (en) * | 2021-05-25 | 2023-08-18 | 泰安昊达汽车零部件有限公司 | Traction hook seat for vehicle and manufacturing method |
| CN115194407A (en) * | 2022-07-06 | 2022-10-18 | 湖北三环锻造有限公司 | Machining method of steering knuckle arm |
| CN115194407B (en) * | 2022-07-06 | 2024-01-09 | 湖北三环锻造有限公司 | Machining method of knuckle arm |
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Application publication date: 20201030 |
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