A crank positioning fixture

Abstract

The invention discloses a crank throw positioning clamp. The crank throw positioning clamp is characterized by comprising a positioning plate, an ejection rod, a taper sleeve, a spring clamping sleeve and a pair of positioning rotary arms. The positioning plate is provided with a first positioning hole and a second positioning hole in parallel; the taper sleeve is installed in the first positioning hole; the ejection rod is installed in the second positioning hole; the spring clamping sleeve is installed in the taper sleeve, and the outer taper face of the spring clamping sleeve is matched with an inner taper hole of the taper sleeve; a stopping ring is arranged on the outer side of the spring clamping sleeve; the positioning rotary arms are symmetrically arranged along the center connecting line of the first positioning hole and the second positioning hole, and the middle portions of the positioning rotary arms are both hinged to the outer side face of the positioning plate; the outer end of the ejection rod is provided with a taper part, a gap exists between the first ends of the pair of positioning rotary arms, and the second ends of the pair of positioning rotary arms are located on the two sides of the spring clamping sleeve. By means of the crank throw positioning clamp, accurate positioning can be achieved, and eccentricity is not prone to occurrence.

Description

Technical field [0001] The invention relates to a tortuous positioning clamp. Background technique [0002] The crank is composed of a connecting rod journal (crank pin), two left and right crank arms, and two left and right main journals, while the crankshaft is composed of several cranks. [0003] To illustrate the problems of existing fixtures, see Figure 1-3 , The connecting rod journal on the crank is fixed on the main shaft plate (300) of the machine tool through the positioning plate (200) of the fixture during the turning process, and the main journal positioning hole (201) is provided on the positioning plate (200) ), and the center of the main journal positioning hole (201) is eccentric to a certain distance from the axis of the main spindle disc (300). After the crank is positioned, it needs to meet: first, the connecting rod journal (101) of the crank is coaxial with the spindle disc (300) and cannot move axially; second: the crank arm (102) positioning clamp of the cr...

AI Technical Summary

Problems solved by technology

and figure 2 Then it is the defect that exists as the prior art, that is, the clamping force F on both sides of the crank arm (102) is inconsistent or the uneven force generated by the main journal (100) after positioning produces a torque W, and the connecting rod journal (101) and The spindle disc (300) is no longer coaxial but has a certain eccentricity

And existing fixture is positioned after crank arm (102) clamping location and main journal (100) location, all exists figure 2 The problem of inconsistency between F and middle F, and the need to calibrate and check after each clamping, there are defects such as complicated operation, long auxiliary time and uncontrollable precision; and in the high-speed fine turning of the crank throw, the crank throw is not uniform due to eccentric force. Vibration leads to large dimensional errors after processing, seriously affecting processing accuracy, processing efficiency and processing safety

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