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Sub-heat control fine forging process for automobile spline shaft
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A Spline Shaft, Thermal Control Technology
Inactive Publication Date: 2006-05-24
SHANGHAI JIAOTONG UNIV +1
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Problems solved by technology
Since the production of automobile spline shafts adopts a combination of hot forging and cold extrusion, there is a large energy consumption for hot forging deformation, and the workpiece is prone to overheating, overburning, oxidation, and decarburization. The forging has a large machining allowance and the surface of the forging The quality and comprehensive mechanical properties are not high, and the shortcomings such as poor working conditions
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Embodiment 1
[0022] like figure 1 , image 3 As shown, a sub-heat controlled precision forging process of an automobile spline shaft, the process steps are:
[0023] 1. Blanking. In order to ensure the weight of the blanking and the surface of the material without defects, the hot-rolled 40Cr steel bar can be peeled according to the conventional method, and the blank should be deburred with a shearing machine or a sawing machine.
[0024] 2. The blank can be heated by an intermediate frequencyheating furnace according to the conventional method. In order to prevent decarburization and oxidation, the blank is generally preheated to 100-120°C, immersed in a water-based graphite tank, and a solid will remain on the blank after taking it out. Graphite protects steel from oxidation and lubricates. According to the results of "simulation experiment", the blank heating temperature is 1000°C.
[0025] 3. Sub-heat precision forging, according to the equipment capacity, the head 1 and the rod 2 ...
Embodiment 2
[0029] like figure 1 , image 3 As shown, a sub-heat controlled precision forging process of an automobile spline shaft, the process steps are:
[0030] 1. Cut the material according to the conventional method.
[0031] 2. Preheat the blank to 100-120°C according to the conventional method, and then heat to 980°C.
[0032] 3. Sub-heat precision forging, according to the equipment capacity, the head 1 and the rod 2 are formed at one time. The initial forging temperature is 950°C, and the final forging temperature is controlled to be 850°C. The total degree of deformation of the head 1 is 55%, and the total degree of deformation of the splined portion 3 of the shank 2 is 50%.
[0033] 4. After sub-heat precision forging, the cooling can be controlled by forced blast air cooling.
[0034] 5. Cold extrude the spline 3 according to the conventional method, and the degree of deformation is 20%. In order to ensure the extrusion accuracy, the rod should be ground before cold extr...
Embodiment 3
[0036] like figure 1 , image 3 As shown, a sub-heat controlled precision forging process of an automobile spline shaft, the process steps are:
[0037] 1. Cut the material according to the conventional method.
[0038] 2. Preheat the blank to 100-120°C according to the conventional method, and then heat to 950°C.
[0039] 3. Sub-heat precision forging, according to the equipment capacity, the head 1 and the rod 2 are formed at one time. The initial forging temperature is 930°C, and the final forging temperature is controlled to be 860°C. The total degree of deformation of the head 1 was 58%, and the total degree of deformation of the splined portion 3 of the shank 2 was 55%.
[0040] 4. After sub-heat precision forging, the cooling can be controlled by forced blast air cooling.
[0041] 5. The spline 3 is cold-extruded according to the conventional method, and the degree of deformation is 18%. In order to ensure the extrusion accuracy, the rod part should be ground befor...
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Abstract
The invention relates to a sub-heat controlled precision forging process of an automobile spline shaft, which is used in the field of metal plastic processing. The process of the present invention includes two steps of blanking and blank heating. After the blank is heated to 980°C-1000°C, the sub-thermal precision forging of the head and the rod is carried out, and then the waste heat is used to control the cooling, and finally the spline is cold-extruded. Sub-heat precision forging is to extrude the head and rod of the blank once, or to form the head and rod of the blank twice, that is, to extrude the rod first, and then to squeeze the head. The initial forging temperature of sub-heat precision forging is 950°C to 980°C, and the final forging temperature is controlled to be 850°C to 880°C. The invention not only has small material deformation resistance and is easy to form, but also cancels the process of separate normalizing treatment, and uses the residual heat after forming to control cooling, thereby obtaining excellent internal structure and high comprehensive mechanical properties, simplifying the process and saving energy , Improved product quality.
Description
technical field [0001] The invention relates to a precision forging process of automobile parts, in particular to a sub-heat controlled precision forging process of an automobile spline shaft. Used in the field of metal plastic processing. Background technique [0002] Precision forging is a method of obtaining net shape or approximate net shape forgings through basic processes such as forward extrusion, reverse extrusion, radial extrusion, upsetting, fine pressing, or a combination thereof. In my country's processing industry, forward extrusion, reverse extrusion, and radial extrusion at room temperature are called cold extrusion, and upsetting and cold extrusion are called cold forging; extrusion and upsetting of steel above room temperature to 850°C The processing is called warm forging. The precision forging generally referred to includes cold forging and warm forging, and its deformation temperature is in the temperature range above or above room temperature and below ...
Claims
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Application Information
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