High-symmetry-degree machining device for arc-shaped oblong hole

Abstract

The invention discloses a high-symmetry-degree machining device for an arc-shaped oblong hole. The high-symmetry-degree machining device for the arc-shaped oblong hole comprises a bottom plate, wherein a backing plate, a locating sleeve, a quick-acting sheet used as a to-be-machined workpiece, and a pressing plate are sequentially arranged above the bottom plate from bottom to top; a shouldered stud sequentially penetrates through the pressing plate, the quick-acting sheet, the locating sleeve and the backing plate from top to bottom, and then is connected with the bottom plate; the upper partof the shouldered stud is in bolted connection with a shouldered nut; the shouldered nut is in close contact with the top surface of the pressing plate; a wedge block guide groove is formed in the middle part of the front end of the backing plate; a pressing wedge block is arranged in the wedge block guide groove, and in sliding fit with the wedge block guide groove; the left side and the right side of the upper part of the pressing wedge block are provided with a swing pressing block separately; the front end of each swing pressing block is hinged to the top of the backing plate; and the rear ends of the two swing pressing blocks make contact with the inner walls of the two sides of a U-shaped opening in the front end of the quick-acting sheet. The high-symmetry-degree machining device for the arc-shaped oblong hole is capable of accurately and reliably locating the U-shaped opening in one end of the quick-acting sheet, so that improvement for the machining precision for the arc-shaped oblong hole is benefited.

Description

technical field [0001] The invention relates to the technical field of mechanical processing, in particular to a processing device for arc-shaped oblong holes with high symmetry. Background technique [0002] The snap-action piece is the key action part of contact on-off in the composition of the contact seat of the railway signal switch machine product. As shown in FIG. About the U-shaped opening 101 that is symmetrical to the center of the circle, and on the ring on the other side opposite to the U-shaped opening, there is an arc-shaped oblong hole 102 that is symmetrical to the U-shaped opening 101 and the center of the circle; at present, according to the assembly action requirements, It is required that the arc-shaped oblong hole 102 and the U-shaped opening 101 be arranged symmetrically with the central hole 103 of the quick-moving piece 100; [0003] However, due to the large dimensional tolerance of the U-shaped opening 101 of the quick-moving piece 100, the commonl...

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Problems solved by technology

[0003] However, due to the large dimensional tolerance of the U-shaped opening 101 of the quick-moving piece 100, the commonly used positioning methods cannot accurately locate the U-shaped opening 101 of the quick-moving piece 100. Therefore, the processing of the arc-shaped oblong hole 102 in the prior art The accuracy cannot meet the requirement of symmetry. Therefore, it is necessary to design a processing device for arc-shaped oblong holes, which can meet the processing accuracy requirements for arc-shaped oblong holes.

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