Check tool for measuring axial length of crank shaft and application thereof

Abstract

The invention discloses a check tool for measuring the axial length of a crank shaft and the application thereof. The check tool is characterized in that both ends of a measuring frame are respectively provided with downwards vertical measuring arms, the end heads of the measuring arms are respectively provided with positioning blocks, a positioning measure head is arranged on one positioning block, the other end of the measuring frame is provided with a measuring measure head opposite to the positioning measure head, the measuring measure head is arranged on one end of a lever, and the other end of the lever is in contact with a dial indicator. The invention also discloses a method for applying the check tool to the axial length detection of the crank shaft and the online axial length detection method of the crank shaft in the processing station of a machine tool. The check tool has high measuring precision, can be used for accurate measurement on occasions with two measuring points which have unequal heights and can not be accurately measured by vernier calipers, can also conveniently realizes the on-line measurement of the crank shaft in the processing station of a machine tool and avoid rapidly advanced grinding wheels colliding with workpieces to scrap the crank shaft.

Description

technical field [0001] The invention relates to a measuring tool, in particular to a checking tool for measuring the axial length of a crankshaft and its application. Background technique [0002] Usually the axial dimension of the shaft parts is measured with a vernier caliper, and the use of a vernier caliper to measure the axial direction of the crankshaft has the following shortcomings: [0003] (1) The two measuring feet of the vernier caliper are at the same height. When the two measuring points are not at the same height, such as: the axial distance from the thrust gear of the crankshaft to each connecting rod journal of P11C, the distance between the thrust gear of the crankshaft and the small head The axial distance of the steps requires accuracy within ±0.1mm. The vernier caliper cannot be used to level the caliper at all, and there is an angle α with the horizontal plane, so accurate measurement cannot be carried out, and when measuring a long axial distance, due ...

AI Technical Summary

Problems solved by technology

[0003] (1) The two measuring feet of the vernier caliper are at the same height. When the two measuring points are not at the same height, such as: the axial distance from the thrust gear of the crankshaft to each connecting rod journal of P11C, the distance between the thrust gear of the crankshaft and the small head The axial distance of the steps requires accuracy within ±0.1mm. The vernier caliper cannot be used to level the caliper at all, and there is an angle α with the horizontal plane, so accurate measurement cannot be carried out, and when measuring a long axial distance, due to everyone The measurement force of the two measuring feet of the caliper is inconsistent, and the measurement error of different people is very large, usually reaching 0.05-0.1mm;

[0004] (2) It is impossible to realize the online detection of the crankshaft at the machine tool processing station: due to the inaccurate measurement, the usual practice is to erect the crankshaft, place it on the platform, measure it segment by segment with a digital display height gauge, and then convert it

Because the crankshaft is very heavy, it is very inconvenient to hang it up and down, often causing bumps, and it can only be hoisted to the platform for inspection before or after processing, and online inspection at the processing position cannot be realized;

[0005] (3) In order to ensure the axial distance from the small head step to the thrust block, a digital display grating ruler is usually installed on the grinding machine. After the thrust block is ground, the grating is cleared, and then the small end step is ground according to the display of the grating In this way, it is usually necessary to grind several outer circles with different diameters on one machine tool. When the diameters of several outer circles are quite different, it is very easy for the grinding wheel to collide with the workpiece when it is fast forwarding.

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