CN117123712A - Forging control method for performance and weight consistency of non-quenched and tempered steel connecting rod blanks - Google Patents
Forging control method for performance and weight consistency of non-quenched and tempered steel connecting rod blanks Download PDFInfo
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- CN117123712A CN117123712A CN202310908881.6A CN202310908881A CN117123712A CN 117123712 A CN117123712 A CN 117123712A CN 202310908881 A CN202310908881 A CN 202310908881A CN 117123712 A CN117123712 A CN 117123712A
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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
- B21J5/02—Die forging; Trimming by making use of special dies ; Punching during forging
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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
- B21J1/00—Preparing metal stock or similar ancillary operations prior, during or post forging, e.g. heating or cooling
- B21J1/06—Heating or cooling methods or arrangements specially adapted for performing forging or pressing operations
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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
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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
- B21J9/00—Forging presses
- B21J9/10—Drives for forging presses
- B21J9/20—Control devices specially adapted to forging presses not restricted to one of the preceding subgroups
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- 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
- B21K1/00—Making machine elements
- B21K1/76—Making machine elements elements not mentioned in one of the preceding groups
- B21K1/766—Connecting rods
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- 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
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/25—Process efficiency
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- Forging (AREA)
Abstract
本发明公开了一种非调质钢制连杆毛坯性能及重量一致性的锻造控制方法。本发明采用38MnVS6非调质钢圆棒料锻造生产连杆毛坯的工艺过程依次为：锯切下料、感应加热、高压水除磷、辊锻、压扁、预锻、终锻、切边/冲孔、校正和冷却，其中，感应加热的预热温度控制在1170±20℃，预锻温度≥1100℃，终锻温度≥1050℃。通过精准控制锻造过程中的棒料温度，解决了非调质钢制连杆毛坯锻后力学性能偏低以及涨断后涨断面掉渣等问题，提高了连杆的横向塑性延伸率，降低了冲击功，满足重量偏差满足70g不分组的要求，极大地提高了连杆毛坯的机加工性能、涨断性能、重量一致性以及涨断后的涨断面质量。
The invention discloses a forging control method for the performance and weight consistency of non-quenched and tempered steel connecting rod blanks. The process of this invention using 38MnVS6 non-quenched and tempered steel round bars to forge and produce connecting rod blanks is as follows: sawing and blanking, induction heating, high-pressure water dephosphorization, roll forging, flattening, pre-forging, final forging, trimming/ Punching, correction and cooling, among which, the preheating temperature of induction heating is controlled at 1170±20℃, the pre-forging temperature is ≥1100℃, and the final forging temperature is ≥1050℃. By precisely controlling the temperature of the bar during the forging process, we solve the problems of low mechanical properties of non-quenched and tempered steel connecting rod blanks after forging and slag loss on the expanded section after fracture, improve the lateral plastic elongation of the connecting rod, and reduce the impact The result is that the weight deviation meets the requirement of 70g without grouping, which greatly improves the machining performance, breaking performance, weight consistency and the quality of the broken section after breaking of the connecting rod blank.
Description
Technical Field
The invention belongs to the technical field of automobile material forming, and particularly relates to a forging control method for blank performance and weight consistency of a non-quenched and tempered steel connecting rod.
Background
The engine connecting rod is used as an important part of engine assembly, and the performance quality of the engine connecting rod directly influences the service performance of the engine. Therefore, strict requirements are also put on the mechanical properties of the connecting rod. Namely, the longitudinal tensile strength of the connecting rod is required to be not lower than 900MPa, the elongation after the longitudinal fracture is required to be not lower than 12%, and the elongation after the transverse fracture is required to be not lower than 5%. On the other hand, in order to improve the production efficiency and reduce the grouping or non-grouping of the weight after processing, a host factory puts higher requirements on the weight tolerance of the connecting rod of a forging provider, and the weight of the connecting rod blank is required to meet the requirement of 70g non-grouping. The forging process parameters, particularly the forging temperature, are key factors influencing the quality and weight consistency of the forging, and the excessive heating temperature of forging can cause the phenomena of overburning and overheating; too low forging heating temperature shortens the forging operation time, shortens the forging temperature range, and increases the forging difficulty. Moreover, the finish forging temperature is too high, so that crystal grains continue to grow up at high temperature after the forging is stopped, the crystal grains of the forging are coarse, and the mechanical property of the forging is reduced; when the final forging temperature is too low, the forging has poor plasticity, difficult deformation and increased internal stress, and even causes cracks. The heating temperature range is reasonably and accurately controlled, and the influence of temperature fluctuation on the thickness of the connecting rod can be reduced, so that the weight deviation of the connecting rod is reduced. Therefore, the quality of the connecting rod can be effectively ensured by reasonably controlling the technological parameters in the forging process.
At present, although research on the expansion and breaking process of the connecting rod is carried out in China, main equipment and materials are imported from abroad, the technology is still immature, a plurality of problems such as tearing, expanding, slag falling, fracture surface deformation and the like exist in actual production, the stability of the product quality is influenced, the influence mechanism of various factors on the expansion and breaking quality of the connecting rod is not clear, the selection of the expansion and breaking process parameters is mainly dependent on experience, and no theoretical support exists, so that the research on the localization of a blank of the connecting rod and the expansion and breaking technology of the connecting rod is urgent.
Disclosure of Invention
Aiming at the problems, the invention provides a forging control method for blank performance and weight consistency of a non-quenched and tempered steel connecting rod. On the premise of ensuring the implementation of the existing production line, the technical process and forging temperature range of the 38MnVS6 non-quenched and tempered steel forging connecting rod blank are defined, the problems of material defects, insufficient mechanical properties and the like caused by too high or too low forging temperature are solved, and the requirement that the weight deviation is 70g and no grouping is met. On the premise of ensuring that the performance and weight consistency of the forging blank meet the requirements, the problems of slag falling/sharp steps and the like of the expanded section after the connecting rod is expanded are solved.
Aiming at the problems of undefined forging process of non-quenched and tempered steel connecting rod blanks, unstable blank performance and weight after forging and defects in the expanding and breaking process in the prior art, the invention provides a forging control method for the non-quenched and tempered steel connecting rod blanks, which comprises the following steps of: sawing blanking, induction heating, high-pressure water dephosphorization, roll forging, flattening, pre-forging, finish forging, trimming/punching, correcting and cooling to finally obtain a qualified broken connecting rod blank, and is characterized in that the preheating temperature of the induction heating is controlled to 1170+/-20 ℃, the pre-forging temperature is controlled to be more than or equal to 1100 ℃, and the finish forging temperature is controlled to be more than or equal to 1050 ℃. By accurately controlling the temperature of the material in the forging process, the problems of low mechanical property and large weight deviation of the non-quenched and tempered steel connecting rod blank after forging are solved, and the machining property, weight consistency and the quality of the expanded section of the connecting rod blank after expanding are greatly improved.
According to the forging control method for the blank performance and weight consistency of the non-quenched and tempered steel connecting rod, a strict temperature control range (see figure 2) is set in each forging process, and the process steps and the temperature control are as follows:
s1: sawing and blanking, wherein the end face angle of the blanking section is less than or equal to 2 degrees;
s2: induction heating, wherein the discharging temperature of the material section is controlled to 1170+/-20 ℃, and the blank is not heated again before the whole forging is completed;
s3: high-pressure water dephosphorization, so that the oxide skin removal rate of the surface of the heated bar is more than or equal to 90%;
s4: roll forging to prepare a blank, and drawing a rod part;
s5: flattening;
s6: pre-forging, wherein the pre-forging temperature is more than or equal to 1100 ℃, and the temperature of a die cavity is controlled between 120 and 300 ℃;
s7: final forging, wherein the final forging temperature is equal to or higher than 1050 ℃, and the temperature of a die cavity is controlled between 120 and 300 ℃;
s8: trimming/punching, wherein the trimming temperature is more than or equal to 1000 ℃;
s9: correcting, namely correcting the temperature to be more than or equal to 950 ℃ and ensuring the symmetry, straightness and geometric dimension requirements of the connecting rod; and then cooling to obtain a finished product.
Furthermore, the final cooling treatment process of the invention is to realize quick cooling and slow cooling treatment by controlling the air quantity in the box-type furnace; the method comprises the following steps: the temperature of the connecting rod blank before cooling is more than or equal to 830 ℃, and the connecting rod blank is sequentially cooled by rapid cooling in a box type furnace, slow cooling in the box type furnace, slow cooling in air outside the furnace and stacking cooling in a heat preservation material frame. The rapid cooling in the box-type furnace is as follows: cooling from more than or equal to 830 ℃ to 710+/-20 ℃ at a cooling speed of 1.5-2.5 ℃/S; the slow cooling in the box-type furnace is as follows: cooling from 710+/-20 ℃ to 580+/-20 ℃ at a cooling speed of 0.4-1.3 ℃/S; the slow cooling of the air outside the furnace is as follows: cooling from 580+/-20 ℃ to 480+/-20 ℃ at a cooling speed of 0.13-0.20 ℃/S; stacking and cooling in the heat preservation material frame is as follows: cooled from 480.+ -. 20 ℃ to room temperature.
In the step S1, the end face angle of the material section is less than or equal to 2 degrees; the purpose is that: firstly, the weight is ensured to meet the requirement, the weight deviation is reduced, and the consistency of the weight of the final blank is ensured; secondly, the accurate positioning in the subsequent roll forging process is ensured, the metal flow in the material deformation process is ensured to meet the requirement, and the accurate positioning foundation of the blank in the die in the subsequent forging process is also ensured.
The tapping temperature of the material section in the step S2 is controlled to 1170+/-20 ℃; the temperature is the optimal temperature for experimental investigation of the applicant, and when the tapping temperature of the material section is too high, the mechanical property after forging is low. This is because the high temperature of the billet during the entire forging process can cause grain growth during the forging process, and the size of the forged grains is relatively large, thereby resulting in lower strength and poorer plasticity. In addition, the higher the temperature, the more obvious the volume expansion of the material is, and the volume of the cavity of the forging die is certain, so that the volume of a blank is smaller after forging and cooling, the weight is out of tolerance, and the weight consistency of a product is affected. And the plasticity of the material can be reduced due to the too low temperature, the metal flow is affected, the metal filling in the die cavity in the forging forming process is not facilitated, and defects such as material shortage or folding and the like can be generated.
The pre-forging in the step S6 is performed, the pre-forging temperature is more than or equal to 1100 ℃, and the temperature of a die cavity is controlled between 120 and 300 ℃; the pre-forging temperature cannot be too low, and the plastic property of the material is influenced due to the fact that the pre-forging temperature is too low, so that the material molding in the whole forging process is influenced; the production beat can be effectively controlled by controlling the temperature, and excessive temperature reduction caused by overlong production beat is avoided. Controlling the temperature of a die cavity: because the temperature of the die is low, the temperature of the blank can be obviously reduced when the die contacts the blank, so that the plasticity of the blank is reduced, and the molding performance of metal is affected, and therefore, the die cavity needs to be preheated. The natural gas flame baking mode is adopted, and the temperature rising speed is high, so that the operation is convenient. However, as the material generates heat in the forging deformation process, the preheating temperature of the die is not required to be too high, and the preheating temperature of the die cavity is controlled to be 120-300 ℃ by comprehensively considering the efficiency and the influence on the temperature of the blank.
The control principle of the final forging temperature in the step S7 is the same as that in the step S6. Too low a finish forging temperature can affect the plasticity of the material, thereby affecting the performance of the blank, and too high a temperature change can also affect the weight consistency of the product.
The temperature control principle of the steps S8 and S9 is the same as that of the step S6. Is set for ensuring the continuous performance of the material, and considers the temperature drop caused by the natural cooling of the blank in the production beat.
In conclusion, the forging temperature is precisely controlled, so that the forming performance of the material can be ensured, and the generation of forging defects is avoided; at the temperature, the deformed crystal grains have uniform structure and relatively small crystal grain size, so that the mechanical property of the forged blank is ensured; and thirdly, the expansion rate and the fluidity of the metal material are restrained by restraining the temperature range, so that the weight consistency of the forged blank can be ensured, and the overlarge difference of the external dimensions after forging and cooling caused by overlarge temperature difference is avoided.
The invention has the technical effects that: by accurately controlling the temperature of the bar stock in the forging process, the problems of low mechanical property of the non-quenched and tempered steel connecting rod blank after forging, slag falling of the expanded section after expanding and breaking and the like are solved, the transverse plastic elongation (more than or equal to 5 percent) of the connecting rod is improved, the impact energy is reduced (the requirement of 6-14J is met), and the weight deviation is met, wherein the requirement of 70g of non-grouping is met. Greatly improves the machining performance, the fracture expanding performance, the weight consistency and the fracture expanding quality of the connecting rod blank after fracture expanding.
Drawings
Other features, objects and advantages of the present invention will become more apparent from the detailed description of non-limiting embodiments, which is to be read in connection with the accompanying drawings, in which:
FIG. 1 is a flow chart of a forging process for a non-quenched and tempered steel connecting rod of the present invention;
FIG. 2 is a temperature control diagram of the forging process stages of the non-quenched and tempered steel connecting rod of the present invention;
FIG. 3 is a graph showing the appearance of a fracture with a bulge defect in a connecting rod blank prepared in comparative example 1;
FIG. 4 is a profile of an expanded section fracture of a connecting rod blank prepared in example 1 of the present invention.
Detailed Description
The present invention will be described in detail with reference to specific examples. The following examples will assist those skilled in the art in further understanding the present invention, but are not intended to limit the invention in any way. It should be noted that variations and modifications could be made by those skilled in the art without departing from the inventive concept. These are all within the scope of the present invention.
Tensile test of the examples of the invention reference standard: metallic material tensile test part 1: room temperature test method GB/T228.2-2015; the impact test standard generally adopts GB/T229-2007 Charpy pendulum impact test method for metallic materials.
Example 1:
the invention discloses a 38MnVS6 connecting rod blank forging process control, which specifically comprises the following steps:
s1: sawing the material by using a sawing machine, wherein the end face angle of the material section is less than or equal to 2 degrees;
s2: induction heating: the bar stock was rapidly heated to the set temperature (1170 ℃) and held by induction heating. The tapping temperature of the material section is controlled at 1172 ℃, and the blank is not heated for the second time before the whole forging is completed;
s3: high-pressure water dephosphorization, so that the oxide skin removal rate of the surface of the heated bar is more than or equal to 90%;
s4: roll forging to prepare a blank, and drawing a rod part;
s5: flattening: flattening and deforming the blank after the rod part is pulled out;
s6: pre-forging: grabbing and placing the flattened blank into a preheated pre-forging die cavity, wherein the pre-forging temperature of the blank is 1108 ℃, and the die cavity temperature is controlled to be 120-300 ℃ for pre-forging deformation;
s7: and (3) final forging: grabbing and placing the pre-forged blank into a preheated final forging die cavity, wherein the final forging temperature of the blank is 1060 ℃, and the die cavity temperature is controlled to be 120-300 ℃ to carry out final forging deformation;
s8: trimming/punching, namely placing the final forging piece into a trimming die, cutting off forging flash, and trimming at the temperature of 1012 ℃;
s9: and (3) correction: correcting the temperature to 962 ℃ and ensuring the symmetry, straightness and geometric dimension requirements of the connecting rod; and then cooling (the off-line temperature is 904 ℃ before cooling) to finally obtain the connecting rod blank.
The cooling treatment process realizes quick cooling and slow cooling treatment by controlling the air quantity in a box-type furnace; the method comprises the following steps: the connecting rod blank is sequentially subjected to rapid cooling in a box type furnace, slow cooling in the box type furnace, slow cooling in air outside the furnace and stacking cooling in a heat-preserving material frame. The box-type furnace is cooled from more than or equal to 830 ℃ to 710+/-20 ℃ at a cooling speed of 1.5-2.5 ℃/S; slowly cooling in the box-type furnace from 710+/-20 ℃ to 580+/-20 ℃ at a cooling speed of 0.4-1.3 ℃/S; the air outside the furnace is cooled slowly from 580+/-20 ℃ to 480+/-20 ℃ at the cooling speed of 0.13-0.20 ℃/S; stacking and cooling the materials in the heat-preserving frame from 480+/-20 ℃ to room temperature.
The performance of the continuous casting blank is detected, the weight of the connecting rod blank meets 70g, the connecting rod blank is not grouped, and other detection indexes are shown in Table 3.
Comparative example 1 (high temperature):
the forging process control of the 38MnVS6 connecting rod blank is shown in Table 1, and the rest is the same as example 1. The weight of the connecting rod blank partially does not meet the requirement, the fluctuation range exceeds 70g, and other detection indexes are shown in Table 2.
Table 1 temperature settings for example 1 and comparative example 1
Tables 2 and 3 show the strength, elongation and impact performance of the blanks obtained at the forging temperature of comparative examples and 1 example 1, respectively. Machining and expanding fracture treatment (the technological process mainly comprises the steps of oil hole drilling, laser marking, large and small head hole rough boring, end face grinding, drilling and tapping, cooling, laser grooving, expanding fracture, bolt screwing, small head hole bushing pressing, large and small head hole fine boring, end face grinding, deburring, flaw detection, cleaning, finished product weighing and expanding fracture detection), wherein the appearance of the expanding fracture defect fracture of the connecting rod obtained in the forging temperature of the comparative example 1 is shown in fig. 3; FIG. 4 shows the profile of the expanded cross section of the connecting rod obtained at the forging temperature of example 1 after expansion.
In example 1 and comparative example 1, the round bar induction heating temperature was different, and comparative example 1 was higher than example 1. Accordingly, the temperatures of the pre-forging, finish forging, trimming and correction of comparative example 1 were also higher than those of example 1. As can be seen from comparison of comparative example 1 and example 1, when the temperature is too high, the strength of the connecting rod blank in both the transverse direction and the longitudinal direction is relatively low, and the transverse elongation rate is less than 5%. According to the invention, the improvement and effective control of the performance of the connecting rod blank can be realized by controlling the temperature in the forging process of the 38MnVS6 connecting rod blank. In addition, the connecting rod obtained in example 1 shown in fig. 3 to 4 has better quality of the expanded section than that of comparative example 1 after the expanded section is machined and broken, and no slag or sharp steps are generated.
Table 2: results of testing the properties of the connecting rod blank prepared in comparative example 1 of the present invention
Table 3: results of the test on the properties of the connecting rod blank prepared in example 1 of the present invention
The foregoing description is only illustrative of the present invention and is not intended to limit the scope of the invention, and all equivalent structures or equivalent processes or direct or indirect application in other related technical fields are included in the scope of the present invention.
Claims (8)
1. A forging control method for the performance and weight consistency of a non-quenched and tempered steel connecting rod blank is characterized in that the technical process for producing the connecting rod blank by forging a 38MnVS6 non-quenched and tempered steel round bar material sequentially comprises the following steps: sawing blanking, induction heating, high-pressure water dephosphorization, roll forging, flattening, pre-forging, finish forging, trimming/punching, correcting and cooling, and is characterized in that the preheating temperature of the induction heating is controlled to 1170+/-20 ℃, the pre-forging temperature is more than or equal to 1100 ℃, and the finish forging temperature is more than or equal to 1050 ℃.
2. The forging control method as recited in claim 1, wherein the process steps and temperature control are as follows:
s1: sawing and blanking, wherein the end face angle of the blanking section is less than or equal to 2 degrees;
s2: induction heating, wherein the discharging temperature of the material section is controlled to 1170+/-20 ℃;
s3: high-pressure water dephosphorization, so that the oxide skin removal rate of the surface of the heated bar is more than or equal to 90%;
s4: roll forging to prepare a blank, and drawing a rod part;
s5: flattening;
s6: pre-forging, wherein the pre-forging temperature is more than or equal to 1100 ℃;
s7: final forging, wherein the final forging temperature is more than or equal to 1050 ℃;
s8: trimming/punching, wherein the trimming temperature is more than or equal to 1000 ℃;
s9: correcting, namely correcting the temperature to be more than or equal to 950 ℃ and ensuring the symmetry, straightness and geometric dimension requirements of the connecting rod; and then cooling to obtain a finished product.
3. The forging control method as recited in claim 2, wherein the blank is not secondarily heated until the entire forging is completed.
4. The forging control method as recited in claim 2, wherein a die cavity temperature of said step S6 pre-forging is controlled to be 120 to 300 ℃.
5. The forging control method as recited in claim 2, wherein a die cavity temperature of said step S7 finish forging is controlled to be 120 to 300 ℃.
6. The forging control method as recited in claim 2, wherein said step S9 of cooling treatment is to realize rapid cooling and slow cooling treatment by controlling an air quantity in a box furnace.
7. The forging control method as set forth in claim 6, wherein the temperature of the connecting rod blank before cooling is not less than 830 ℃, and the connecting rod blank is sequentially cooled by box-type furnace internal rapid cooling, box-type furnace internal slow cooling, furnace external air slow cooling and stacking in a heat-preserving material frame.
8. The forging control method as recited in claim 7, wherein,
the rapid cooling in the box-type furnace is as follows: cooling from more than or equal to 830 ℃ to 710+/-20 ℃ at a cooling speed of 1.5-2.5 ℃/S;
the slow cooling in the box-type furnace is as follows: cooling from 710+/-20 ℃ to 580+/-20 ℃ at a cooling speed of 0.4-1.3 ℃/S;
the slow cooling of the air outside the furnace is as follows: cooling from 580+/-20 ℃ to 480+/-20 ℃ at a cooling speed of 0.13-0.20 ℃/S;
stacking and cooling in the heat preservation material frame is as follows: cooled from 480.+ -. 20 ℃ to room temperature.
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| CN117718422A (en) * | 2023-12-29 | 2024-03-19 | 东风本田汽车零部件有限公司 | Process for reducing coarse grains in aluminum alloy forged steering knuckles and aluminum alloy steering knuckle blanks |
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| CN110000319A (en) * | 2019-03-25 | 2019-07-12 | 芜湖万联新能源汽车零部件有限公司 | A kind of band skirt non-hardened and tempered steel piston forging and forming technology |
| CN111286670A (en) * | 2020-02-17 | 2020-06-16 | 宝钢特钢韶关有限公司 | Medium carbon non-quenched and tempered steel and its preparation process and connecting rod and its preparation process |
| CN111408681A (en) * | 2020-04-13 | 2020-07-14 | 南宫市精强连杆有限公司 | Method for Tempering After Forging of Engine Non-quenched and Tempered Steel Connecting Rod |
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| CN117548621A (en) * | 2023-12-22 | 2024-02-13 | 扬力集团股份有限公司 | Automated production line for preparing high-pressure valve body and valve cover blanks and production method thereof |
| CN117718422A (en) * | 2023-12-29 | 2024-03-19 | 东风本田汽车零部件有限公司 | Process for reducing coarse grains in aluminum alloy forged steering knuckles and aluminum alloy steering knuckle blanks |
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