Method for controlling quenching deformation of surface of guide rail block

Abstract

The invention discloses a method for controlling surface quenching deformation of a guide rail block, which belongs to the technical field of machinery, selects a laser heating surface quenching mode with smaller quenching deformation, and comprises the following operation steps: firstly, performing laser heating surface quenching on the guide rail block in a natural state, and determining the concave trend and deformation of the quenching deformation; secondly, applying external force to the guide rail block before quenching according to the quenching concave deformation trend and deformation, so that the workpiece is subjected to upward convex reversible deformation and a certain upward convex amount, and then carrying out quenching treatment; by adopting the method, the quenching deformation reducing effect is obvious, the surface roughness of the workpiece after laser surface quenching is basically kept unchanged, the flatness of the guide rail block after laser surface quenching is within a qualified range, and the guide rail block can be directly put into use. The technical bottleneck that quenching deformation is large and correction is difficult is broken through, and the cost of independent correction and grinding machining is saved.

Description

Technical Field

[0001] The invention relates to a method for controlling the surface quenching deformation of a guide rail block, and belongs to the technical field of machinery. Background Art

[0002] The guide block length of 1500mm only requires one-side wear-resistant surface quenching. The deformation of traditional induction surface quenching is large, and it is difficult to correct the deformation after quenching. The machining amount is large and it is easy to produce scrap. Therefore, it is necessary to design a new method to achieve the minimum deformation of the guide block surface after quenching and reduce the product scrap rate. Summary of the invention

[0003] In order to overcome the deficiencies of the prior art, the present invention provides a method for controlling the surface quenching deformation of a guide rail block, which uses laser heating for surface quenching and controls and reduces quenching deformation by applying external force to the workpiece, thereby saving the cost of correction and grinding.

[0004] The technical solution adopted by the present invention to solve its technical problem is: a method for controlling the surface quenching deformation of a guide rail block, selecting a laser heating surface quenching method with smaller quenching deformation, and the operating steps are as follows: first, the guide rail block is subjected to laser heating surface quenching in a natural state to determine the concave trend and deformation amount of the quenching deformation; secondly, according to the concave deformation trend and deformation amount of the quenching, an external force is applied to the guide rail block before quenching to make the workpiece convex and deformed to a certain convex amount, and the laser surface quenching is performed while maintaining a clamped state, and the external force is removed after cooling to detect the flatness of the guide rail block.

[0005] The beneficial effects of the present invention are as follows: the method can significantly reduce quenching deformation, the surface roughness of the workpiece remains basically unchanged after laser surface quenching, and the flatness of the guide rail block is within the qualified range after laser surface quenching, and can be directly put into use. The present invention breaks through the technical bottleneck of the difficulty in correcting large quenching deformation, and saves the cost of separate correction and grinding. BRIEF DESCRIPTION OF THE DRAWINGS

[0006] Figure 1 It is a schematic diagram of an embodiment of the present invention.

[0007] Numbers in the figure: 1. Working platform, 2. Guide block, 3. Pad, 4. Press plate, 5. Quenching surface. DETAILED DESCRIPTION

[0008] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments.

[0009] A method for controlling the surface quenching deformation of a guide rail block, selecting a laser heating surface quenching method with smaller quenching deformation, and the operating steps are as follows: a guide rail block 2 is placed on a working platform 1, a pad block 3 is supported in the middle where the guide rail block and the working platform 1 are in contact, and pressure plates 4 are provided at both ends of the guide rail block 2.

[0010] The guide rail block 2 is fixed on the working platform 1 by external force clamping the two ends of the guide rail block 2 so that the middle of the guide rail block 2 is convex, and the clamping state is maintained for laser surface quenching. After cooling, the external force is removed and the flatness of the guide rail block is detected.

[0011] The height of the cushion block 3 is determined by performing laser heating surface quenching on the guide rail block 2 in a natural state, and determining the concave trend and deformation amount of the quenching deformation.

[0012] The surface roughness of the quenched surface 5 obtained by the laser heating surface quenching method remains basically unchanged.

[0013] The following table shows the straightness test data of the guide rail block 2 sample after quenching obtained by this method: It can be seen from the above table that the method of the present invention has an obvious effect in reducing quenching deformation.

Claims

1. A method for controlling the surface quenching deformation of a guide rail block, characterized in that: The laser heating surface quenching method is selected, and the operation steps are as follows: the guide rail block (2) is placed on the working platform (1), and the middle part where the guide rail block and the working platform (1) are in contact is supported by a pad block (3). The two ends of the guide rail block (2) are provided with a pressing plate (4). The two ends of the guide rail block (2) are clamped by the external force of the pressing plate (4) so ​​that the middle of the guide rail block (2) is in an upward convex state, and the clamped state is maintained for laser surface quenching. After cooling, the external force is removed and the flatness of the guide rail block is detected.

2. A method for controlling surface quenching deformation of a guide rail block according to claim 1, characterized in that: The height of the cushion block (3) is determined by performing laser heating surface quenching on the guide rail block (2) in a natural state, and determining the concave trend and deformation amount of the quenching deformation.

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