CN114653878A

CN114653878A - Warm-cold composite forging production process for hollow shaft sleeve of transmission shaft of SUV passenger vehicle

Info

Publication number: CN114653878A
Application number: CN202210481025.2A
Authority: CN
Inventors: 张太良; 王丽梅; 申剑; 庄日松
Original assignee: Jiangsu Winner Machinery Co Ltd
Current assignee: Jiangsu Winner Machinery Co Ltd
Priority date: 2022-05-05
Filing date: 2022-05-05
Publication date: 2022-06-24

Abstract

The invention discloses a warm-cold composite forging production process of a hollow shaft sleeve of a transmission shaft of an SUV passenger vehicle, which comprises the following steps: blanking, warm forging, annealing, finishing and drawing, finish machining and quenching. By adopting the technical scheme, the hollow shaft sleeve of the transmission shaft has high internal tissue density, good mechanical property and stable quality, reduces the production cost, improves the production efficiency and has high product precision.

Description

Warm-cold composite forging production process for hollow shaft sleeve of transmission shaft of SUV passenger vehicle

Technical Field

The invention belongs to the field of forging processing, and particularly relates to a production process of a hollow shaft sleeve of a transmission shaft of an SUV passenger car.

Background

The hollow shaft sleeve of the transmission shaft of the passenger car is mainly used for a steering system of the passenger car, the hollow shaft sleeve is of a hollow cylinder structure, one end of the hollow shaft sleeve is open, the other end of the hollow shaft sleeve is closed, an inner cavity of the hollow shaft sleeve is of a spline structure, and the depth of the hollow shaft sleeve reaches 180 mm. A hollow shaft sleeve of a transmission shaft of a passenger vehicle produced and processed currently is generally processed by a round bar machine, and a spline of an inner cavity is processed by gear shaping. The hollow shaft sleeve of the transmission shaft of the passenger car, which is produced by the process, has the advantages of poor compactness of materials, poor impact resistance, low strength, large processing allowance and long production period. The hollow shaft sleeve is easy to crack and the like, and cannot adapt to the development trend of the current automobile industry.

Disclosure of Invention

Aiming at the defects of the prior art, the invention provides a warm-cold composite forging production process, and by adopting the technical scheme, the hollow shaft sleeve has high internal tissue density, good mechanical property and stable quality, and meanwhile, the production cost is reduced, the production efficiency is improved, and the product precision is high.

The invention is realized by the following technical scheme:

the SUV passenger vehicle transmission shaft hollow shaft sleeve warm-cold composite forging production process comprises the following steps: blanking, warm forging, annealing, finishing and drawing, finish machining and quenching.

The warm forging step comprises: the heating temperature is 860 +/-20 ℃, and the heated blank is placed into a die for warm forging and upsetting and is reversely extruded to form an inner hole and an inner cavity spline.

The annealing step comprises: and putting the blank formed by warm forging into a pit furnace for annealing, heating to 540 +/-5 ℃, preserving heat for 3H, and discharging.

The finishing and drawing step comprises: and (3) putting the annealed blank subjected to phosphorization and saponification into a die, and finishing and drawing the blank into a cavity.

The quenching step comprises: high-frequency induction quenching, and the high-frequency is 15 KHZ.

Compared with the prior art, the invention has the following beneficial effects:

aiming at the defects of the existing production process, the invention adopts a production processing process of warm forging and cold finishing drawing and forming, the warm forging saves energy, reduces the production cost, and the inner hole and the inner cavity spline are formed at one time, thereby reducing the working procedures, improving the production efficiency and shortening the production period; cold finishing is performed to lengthen, product precision is improved, and finish machining amount is reduced. By adopting the technical scheme, the steering gear box rotor has the advantages of good internal organization, high density, high strength, impact resistance, high yield of products, good mechanical properties of products and stable quality, and can meet the use requirements of the steering gear box rotor.

Drawings

FIG. 1 is a schematic structural diagram of a hollow shaft sleeve of a transmission shaft of an SUV passenger vehicle according to an embodiment of the present invention;

FIG. 2 is a top view of FIG. 1;

FIG. 3 is a flow chart of a blank forging deformation process according to an embodiment of the present invention.

Number in the figure: 1. inner bore, 2, spline, 3, closed end, 4, open end.

Detailed Description

The technical solution of the present invention is further specifically described below by way of examples with reference to the accompanying drawings.

Example (b): referring to fig. 1 and 2, the hollow shaft sleeve of the transmission shaft of the SUV passenger car is of a hollow cylinder structure and is provided with an inner hole 1, an open end 4 and a closed end 3, the depth of the inner hole 1 reaches 180mm, the inner cavity is of a spline 2 structure, and the depth reaches 180mm, and the hollow shaft sleeve is mainly used for a steering system of the passenger car. Referring to fig. 3, the production process comprises the following steps: feeding: cutting out the metal bar by a circular sawing machine according to the drawing; shot blasting: performing shot blasting treatment on the prepared blank, and removing oxide skin on the surface; ③ coating graphite: heating the blank to 220 +/-20 ℃, and then carrying out surface thin graphite coating to prevent the surface of the heated metal material from decarbonizing; warm forging: heating the blank to 860 +/-20 ℃, putting the heated blank into a die for warm forging and upsetting, and carrying out backward extrusion to form an inner hole 1 and an inner cavity spline 2; annealing: putting the blank formed by warm forging into a pit furnace for annealing, heating to 540 +/-5 ℃, preserving heat for 3H, and discharging; sixthly, shot blasting phosphorization saponification creates conditions for cold forging metal flow; seventhly, finishing and drawing: placing the annealed blank subjected to phosphating and saponification treatment into a die, and finishing and drawing the blank in an inner cavity; and (v): processing the inner hole 1, the spline 2 and the outer wall of the blank subjected to finishing drawing to the size required by the drawing; ninthly, quenching: high-frequency induction quenching, the high-frequency is 15KHZ, the workpiece after finish machining is placed in an induction coil, when alternating current is supplied to the induction coil, an alternating magnetic field is formed in the coil, closed current, namely eddy current, is induced in the workpiece and is intensively distributed on the surface of the workpiece due to the skin effect, the surface temperature of the workpiece is rapidly heated to above 850 ℃, the heating time is 5S, and then the workpiece is rapidly cooled in a cooling medium, so that the surface of the workpiece obtains martensite, the surface hardness is improved, and the product strength is increased.

The embodiments are only for the purpose of facilitating understanding of the technical solutions of the present invention, and do not constitute a limitation to the scope of the present invention, and any simple modification, equivalent change and modification made to the above solutions without departing from the contents of the technical solutions of the present invention or the technical spirit of the present invention still fall within the scope of the present invention.

Claims

The SUV passenger vehicle transmission shaft hollow shaft sleeve warm-cold composite forging production process is characterized by comprising the following steps of: the method comprises the following steps: blanking, warm forging, annealing, finishing and drawing, finish machining and quenching.
2. The SUV passenger vehicle transmission shaft hollow shaft sleeve warm-cold composite forging production process according to claim 1, characterized in that the warm forging step: the heating temperature is 860 +/-20 ℃, and the heating blank is placed into a die for warm forging and upsetting and reverse extrusion forming of the inner hole and the inner cavity spline.
3. The SUV passenger vehicle transmission shaft hollow shaft sleeve warm-cold composite forging production process according to claim 1, characterized in that the annealing step: and putting the blank formed by warm forging into a pit furnace for annealing, heating to 540 +/-5 ℃, preserving heat for 3H, and discharging.
4. The SUV passenger vehicle transmission shaft hollow shaft sleeve warm-cold composite forging production process according to claim 1, characterized in that the finishing and drawing step: and (3) putting the annealed blank subjected to phosphorization and saponification into a die, and finishing and drawing the blank into a cavity.
5. The SUV passenger vehicle transmission shaft hollow shaft sleeve warm-cold composite forging production process according to claim 1, characterized in that the quenching step: high-frequency induction quenching, and the high-frequency is 15 KHZ.