A device and process for measuring the expansion of gears after heating by laser reflection

Abstract

The invention discloses a device and a process for measuring an expansion amount of a heated gear by means of laser reflection, which relate to the technical field of gear heat treatment. The device comprises a numerical control console, a worm and gear rotating platform, a double-sliding-block lifting plate vertical transmission mechanism, a double-ball-screw horizontal transmission mechanism, arotary light path measuring mechanism, a base and a workbench. The process comprises the steps of: firstly, generating an unheated gear tooth profile curve according to gear basic parameters input bya computer and a position of one point on a heated gear tooth profile curve obtained through scanning by the computer; secondly, adjusting a button to control vertical and horizontal distances betweenas well as rotating and swing angles of a measuring hook and a measuring point, so that the tip position of the measuring hook is in contact with a to-be-measured point, the direction thereof is thesame as a normal direction of the to-be-measured point, and the contact pressure is greater than 220Pa; and recording a thermal expansion curve graph of a to-be-measured gear in real time as the to-be-measured gear is cooled, and completing the measurement operation. The device and the process are simple in operation and high in practicability, and effectively solve the measurement problem of gearthermal expansion amount.

Description

technical field [0001] The invention relates to the technical field of gear heat treatment, in particular to a device and a process for measuring the expansion amount of a gear after heating by using laser reflection. Background technique [0002] Gear is the most widely used transmission part in modern machinery. Its transmission system has the advantages of compact structure, high transmission efficiency, high power and stable operation. In the field of construction machinery, most parts fail due to excessive wear on the surface. The wear resistance of gears is poor, and the surface accuracy is easy to drop during work, which in turn affects the normal operation of the overall equipment. In the heat treatment process of gears, there is a common and difficult problem, that is, the expansion deformation of gears after quenching. In some small machines or small and medium-sized gears used in automobiles, this deformation may be relatively small. There will be cases where it ...

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Problems solved by technology

However, in the heavy-duty gears and large gears used in engineering vehicles or large agricultural machines, due to the huge volume of the gear itself, this deformation will be amplified very obviously, and the deformation is so large that the gears cannot mesh after heat treatment. Therefore, follow-up processes such as gear grinding are required, but grinding will cause the hardened layer of heat treatment to become thinner, so that the quenching effect is not obvious

Gear expansion and deformation caused by heat treatment cannot be avoided. Although the national technology is constantly optimizing the heat treatment process of gears to reduce this deformation as much as possible, there is currently no device and process for measuring the thermal expansion of gears. It can effectively measure the thermal expansion of a certain point or part of the gear

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