CN-117798826-B - Shot blasting method and device for spiral bevel gear

CN117798826BCN 117798826 BCN117798826 BCN 117798826BCN-117798826-B

Abstract

The invention discloses a method and a device for shot blasting of a spiral bevel gear, wherein the method comprises the steps of controlling the rotation of a rotary table at a set rotary table rotation speed so as to drive the spiral bevel gear to rotate, controlling a spray gun to carry out shot blasting operation on the rotating spiral bevel gear according to a set spray gun posture, a spray gun path and a spray gun moving speed, wherein the spray gun posture is determined according to an impact center point of shot blasting on the spiral bevel gear, the spray gun path is determined according to the motion characteristics of the spiral bevel gear and the spray gun, and the rotary table rotation speed and the spray gun moving speed are determined after speed matching according to performance parameters of the spray gun. The method can be applied to the shot peening of gears with different inner diameters and outer diameters, effectively avoids the problem of uneven shot peening of the gears, simultaneously avoids the quality problems of excessive shot peening induced cracks and the like, and can shorten the development period of the shot peening process of the gears.

Inventors

YUAN XIAO
ZHU XUN
LU ZHIJUN

Assignees

江苏徐工工程机械研究院有限公司

Dates

Publication Date: 20260505
Application Date: 20240103

Claims (6)

1. A spiral bevel gear peening method, comprising: controlling the rotation of the turntable at a set rotating speed of the turntable, and driving the spiral bevel gear to rotate; controlling the spray gun to carry out shot blasting operation on the rotating spiral bevel gear according to the set spray gun posture, the spray gun path and the spray gun moving speed; the spray gun posture is determined according to the impact center point of shot blasting on the spiral bevel gear; The spray gun path is determined according to the motion characteristics of the spiral bevel gear and the spray gun; The rotating speed of the rotary table and the moving speed of the spray gun are determined after speed matching according to the performance parameters of the spray gun; Wherein, the spray gun path is confirmed according to spiral bevel gear and spray gun's motion characteristic, includes: When the spiral bevel gear rotates along with the turntable, the spray gun reciprocates above the spiral bevel gear along the spiral line direction, and the path formed by the spray gun is a cone, so that the spray gun path is: ; Wherein, the 、、 For the corresponding x, y and z axis coordinates on the lance path, Is the distance from the starting point of the conical logarithmic spiral curve to the cone top, The independent variable represents the projection angle of the angle rotated by the impact center point on the bottom surface, Is in the shape of a half cone angle, Is the helix angle of the spiral bevel gear, For the distance of the spray gun outlet center point from the impingement center point, When the spray gun is perpendicular to the midpoint of the spiral line, the spray gun extension line forms an included angle with the PA line; the impact center point is the intersection line of the tooth root region and the tooth bottom region of the spiral bevel gear and is deviated to the position of the tooth root region by a set distance; The performance parameters of the spray gun comprise the linear velocity of shot blasting Sum step distance ; The revolving stage rotational speed and spray gun travel speed specifically do: Rotating speed of turntable ; Speed of movement of spray gun ; Wherein, the Is the diameter of a certain impact center point on the spiral bevel gear, , Is the distance from the starting point of the conical logarithmic spiral curve to the cone top, The independent variable represents the projection angle of the angle rotated by the impact center point on the bottom surface, Is in the shape of a half cone angle, Is the helix angle of the spiral bevel gear.
2. The spiral bevel gear peening method according to claim 1, wherein the torch attitude is determined from an impact center point of peening on the spiral bevel gear, comprising: Determining the direction of the spray gun according to the impact direction, wherein the projection of the impact direction on a horizontal plane is on the connection line of the vertex of the adjacent tooth and the impact center point; determining the angle of the spray gun, wherein when the impact direction is 90 degrees with the spiral line where the impact center point is located, the P point is not moved, and in the vertical direction, the spray gun is far away from the tooth top and deviates from the PA line I.e. with concave surface deviating upwardly The convex surface is downwardly deviated Wherein, the P point is the impact center point, the PA line is the connection line between the adjacent tooth peak and the impact center point, When the spray gun is perpendicular to the midpoint of the spiral line, the spray gun extends into an included angle with the PA line.
3. The method of peening a spiral bevel gear according to claim 1, wherein the shot size is equal to or less than half of the minimum fillet radius in the root R angle of the spiral bevel gear.
4. A spiral bevel gear shot blasting method according to claim 3, wherein the spiral bevel gear tooth root R angle is equal to the fillet radius of a cutter for machining the spiral bevel gear.
5. The method of blasting a spiral bevel gear according to claim 1, wherein a blast gun is provided on each of the concave and convex surfaces of the teeth of the spiral bevel gear, and the blast operation is performed on the concave and convex surfaces of the teeth of the spiral bevel gear.
6. A spiral bevel gear peening apparatus comprising: The first execution module is used for controlling the rotation of the turntable at a set rotating speed of the turntable so as to drive the spiral bevel gear to rotate; the second execution module is used for controlling the spray gun to carry out shot blasting operation on the rotating spiral bevel gear according to the set spray gun posture, the spray gun path and the spray gun moving speed; the spray gun posture is determined according to the impact center point of shot blasting on the spiral bevel gear; The spray gun path is determined according to the motion characteristics of the spiral bevel gear and the spray gun; The rotating speed of the rotary table and the moving speed of the spray gun are determined after speed matching according to the performance parameters of the spray gun; Wherein, the spray gun path is confirmed according to spiral bevel gear and spray gun's motion characteristic, includes: When the spiral bevel gear rotates along with the turntable, the spray gun reciprocates above the spiral bevel gear along the spiral line direction, and the path formed by the spray gun is a cone, so that the spray gun path is: ; Wherein, the 、、 For the corresponding x, y and z axis coordinates on the lance path, Is the distance from the starting point of the conical logarithmic spiral curve to the cone top, The independent variable represents the projection angle of the angle rotated by the impact center point on the bottom surface, Is in the shape of a half cone angle, Is the helix angle of the spiral bevel gear, For the distance of the spray gun outlet center point from the impingement center point, When the spray gun is perpendicular to the midpoint of the spiral line, the spray gun extension line forms an included angle with the PA line; the impact center point is the intersection line of the tooth root region and the tooth bottom region of the spiral bevel gear and is deviated to the position of the tooth root region by a set distance; The performance parameters of the spray gun comprise the linear velocity of shot blasting Sum step distance ; The revolving stage rotational speed and spray gun travel speed specifically do: Rotating speed of turntable ; Speed of movement of spray gun ; Wherein, the Is the diameter of a certain impact center point on the spiral bevel gear, , Is the distance from the starting point of the conical logarithmic spiral curve to the cone top, The independent variable represents the projection angle of the angle rotated by the impact center point on the bottom surface, Is in the shape of a half cone angle, Is the helix angle of the spiral bevel gear.

Description

Shot blasting method and device for spiral bevel gear Technical Field The invention belongs to the technical field of gear machining, and particularly relates to a shot blasting method and device for a spiral bevel gear. Background The spiral bevel gear is a key part of a high-end box bridge and a speed reducer of the engineering machinery transmission system and plays roles of reducing speed and increasing torque and changing the power transmission direction in the power transmission process. The logarithmic spiral bevel gear is a novel spiral bevel gear taking a conical logarithmic spiral curve as a tooth direction line and taking an involute as a tooth profile curve, and the included angle between any point on the conical logarithmic spiral curve and a conical generatrix along the tangential direction of the conical logarithmic spiral curve is a fixed value, namely the spiral angle is a fixed value, so that the logarithmic spiral bevel gear has better transmission characteristics. Service life and service performance of the engineering mechanical transmission system are closely related to surface hardness, residual stress distribution and surface roughness of the spiral bevel gear. The working conditions of high rotation speed, high overload, high impact and high temperature put very high demands on the quality of the spiral bevel gear, and based on the high demands, besides carburizing and quenching and gear grinding the gear, the fatigue resistance of the gear, particularly the bending fatigue resistance of the tooth root, is usually enhanced by adopting shot peening. The gear shot peening is generally driven by a rotary table to rotate, and meanwhile, the spray gun is fed at a constant speed along the axis or radial direction of the gear, so that the shot peening of all tooth roots of the gear is realized. When the actual shot blasting process is developed, the rotating speed of the rotary table is always unchanged, the fast moving speed of the spray gun is adopted for uniform feeding, the fluorescent residue on the surface of the gear is checked, if the fluorescent residue exists, the moving speed of the spray gun is gradually reduced for shot blasting, the shot blasting time is increased, the fluorescent residue is checked again until the residue is 2%, and the coverage rate of 100% is judged. The general technical requirement is 200% coverage, and the shot blasting time of 100% coverage is doubled, namely the moving speed of the spray gun is halved. The method is time-consuming and labor-consuming, the stress distribution is uneven, the problem of overspray and underspray is caused, and the problem of crack initiation is caused easily, so that the improvement of the fatigue resistance and wear resistance of the tooth surface is influenced. Moreover, when the diameter and the inner diameter and the outer diameter of the gear are changed each time, no rule can be circulated, and the gear process needs to be developed by repeating the steps again. Therefore, there is an urgent need to develop a shot peening method capable of shortening the development cycle of the gear shot peening process while improving the shot peening quality. Disclosure of Invention In order to solve the defects in the prior art, the invention provides the spiral bevel gear shot blasting method and the spiral bevel gear shot blasting device, which can be applied to the gear shot blasting reinforcement of different inner diameters and outer diameters, effectively avoid the problem of uneven gear shot blasting, simultaneously avoid the quality problems of crack induction and the like caused by excessive shot blasting, and shorten the development period of the gear shot blasting process. In order to achieve the above purpose, the technical scheme adopted by the invention is as follows: According to the method, a rotating table is controlled to rotate at a set rotating table rotating speed so as to drive a spiral bevel gear to rotate, a spray gun is controlled to carry out shot blasting operation on the rotating spiral bevel gear at a set spray gun posture, a spray gun path and a spray gun moving speed, the spray gun posture is determined according to an impact center point of shot blasting on the spiral bevel gear, the spray gun path is determined according to the spiral bevel gear and the movement characteristics of the spray gun, and the rotating table rotating speed and the spray gun moving speed are determined after speed matching according to performance parameters of the spray gun. Further, the impact center point is the intersection line of the tooth root region and the tooth bottom region of the spiral bevel gear and is deviated to the tooth root region by a set distance. Further, the spray gun posture is determined according to the impact center point of the shot blasting on the spiral bevel gear, and the spray gun posture comprises the steps of determining the spray gun direction according to the impact direction, wherein