A method for forming low-strength thick plate fine-blanking parts with countersunk holes and slender blind holes

Abstract

The invention discloses a forming method of a low-strength thick plate fine-blanked part with a counter bore and a slender blind hole. The forming method comprises the steps of S1, leapfrog fine blanking, specifically, three procedures are included, namely the first procedure of punching a positioning hole and a pre-extrusion hole, the second procedure of positioning the positioning hole, extruding the counter bore and punching a threaded bottom hole, and the third procedure of positioning the positioning hole, punching the counter bore, punching a large hole and blanking the outline; S2, thickness grinding, specifically, the thick plate fine-blanked part is ground by a grinding machine to reach the size required by a drawing; S3, drilling of the slender blind hole, specifically, the thickplate fine-blanked part is fixed with a drilling clamp, and the slender blind hole is drilled through a drilling machine; and S4, burr removing, specifically, the thick plate fine-blanked part is fixed with a burr removing clamp after being drilled, and burrs are removed through a vibration finishing device. By adoption of the leapfrog fine blanking formation mode, the low-strength thick plate fine-blanked part with multiple procedures such as blanking and counter bore extrusion can be punched on one die, the positioning precision in the machining process is improved and part shaking in the drilling feeding process is avoided through arrangement of the suitable drilling clamp, the efficiency is high, the cost is reduced, and the dimension and position degree precision requirements can bemet.

Description

technical field [0001] The invention relates to the technical field of part processing, in particular to a method for forming a low-strength thick plate fine-blanking part with a counterbore and an elongated blind hole. Background technique [0002] Fixed plate thick plate parts with a thickness of 8 to 12mm are an important part of electrical parts. The material is generally low-strength steel with a strength of no more than 500MPa. After spheroidizing annealing, the thickness tolerance is required to be 0.1mm; the part has multiple sink holes, and the depth of the sink hole exceeds 25% of the material thickness; the side of the part is also designed. For long blind holes, the position requirements are strict, and the parts are surrounded by sharp edges. [0003] For the forming method of this kind of parts, if machining is used, the cost is high and the efficiency is low. If fine blanking is used, the processing of countersinking is the difficulty of fine blanking process...

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Problems solved by technology

[0003] For the forming method of this kind of parts, if machining is used, the cost is high and the efficiency is low. If fine blanking is used, the processing of countersinking is the difficulty of fine blanking process; secondly, the position accuracy of slender blind holes is required to be high when drilling , the ordinary clamping method is difficult to guarantee; in addition, the strength of the parts is low, and there are sharp edges around them. If the conventional vibration deburring method is used, the collision between the parts will cause the sharp edges to be easily damaged. If special deburring equipment such as brush Opto-mechanical, equipment investment cost is high

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