Machining method for precise taper holes of high-strength steel
A taper hole processing method and high-strength steel technology, which are applied in the field of machining, can solve the problems of the hole being in a flared state without improvement, difficult precision requirements, and easy to break.
Inactive Publication Date: 2015-11-25
JIANGXI HONGDU AVIATION IND GRP
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Problems solved by technology
There are the following technical defects: 1) The precision of EDM taper hole is low, and it is difficult to ensure the accuracy requirements. The hole is bell-mouthed and the roughness is low. After grinding, the surface roughness is improved, but the state of the hole is bell-mouthed.
The hardness of the parts is high, HRC=50 or more, and the hardness of ordinary white steel knives is not enough
The bonding surface between the tapered surface and the tool is long, and the tool is easily broken due to the large torque
[0003] 2) The processing efficiency is low, and it takes half a day to drill a hole by EDM
Method used
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Embodiment 1
[0015] figure 2 The processing example in the above comes from the processing of the tapered hole of the rotating shaft of a certain model, and the material is 30GrMnSiNi2A ， After heat treatment σb=1665±100MPa, taper hole φ17.5H9 taper 1:20K7, after many tests, according to figure 2 In the method shown, a group of straight holes is processed first, and then cylindrical holes φ16.05H29, φ16.25H25, φ16.5H20, φ16.75H15, φ17H10, φ17.25H5 are sequentially processed with a cemented carbide reamer. After processing, multiple The cylindrical hole constitutes a tapered hole, which successfully solves the processing bottleneck and provides a good reference for similar processing in the future.
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The invention provides a machining method for precise taper holes of high-strength steel. The machining method is characterized in that a set of straight holes are firstly machined; then a cemented carbide solid reamer is adopted, and the straight holes are reamed into the taper holes according to the machining mode of pagoda-shaped holes; and a machining depth graduated line is drawn on the reamer to be matched with measurement. According to the machining method, the aim of machining the precise taper holes through high-strength steel difficultly-machined material is achieved, the machining efficiency can be improved, and the machining quality can be guaranteed.
Description
technical field [0001] The invention relates to a method for machining a high-strength steel precision taper hole, belonging to the technical field of mechanical processing. Background technique [0002] In the field of aviation manufacturing, high-strength steel is often used as structural parts. For example, the shaft material of a certain model is 30GrMnSiNi2A. After thermal treatment, σb=1665±100MPa, there are 4 taper holes on the shaft 4×φ17.5H9 taper 1: 20K7 and rocker arm After assembly, the rocker arm material is 30GrMnSiNi2A, and the 4 taper holes are processed after heat treatment. The material has high hardness, and the plan of taper hole drilling is adopted by EDM. There are the following technical defects: 1) The precision of EDM taper hole is low, and it is difficult to guarantee the accuracy requirement. The hole is bell-mouthed and the roughness is low. After grinding, the surface roughness is improved, but the state of the hole is bell-mouthed. The hardness...
Claims
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IPC IPC(8): B23D75/00B23D77/14B23P15/00
CPCB23D75/00B23D77/14B23P15/00
Inventor 胡晓玲王丙杰万丹拓建峰
Owner JIANGXI HONGDU AVIATION IND GRP
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