A Method for Adjusting the Position and Posture of the Tool Axis in the Grinding Process of Blade Parts

A technology of grinding processing and adjustment method, which is applied in the field of adjusting the position and posture of the cutter shaft in the grinding processing of blade parts, and can solve the problems of non-smooth grinding edge curves and inability to process

Active Publication Date: 2021-04-09
CHONGQING UNIV OF TECH
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Problems solved by technology

In the process of segmental grinding, the sharp angle phenomenon occurs at the joint of the corner due to the adjustment of the speed and the change of the position and orientation of the tool axis, so that the curve of the grinding edge is not smooth, that is, it is easy to produce waste parts; and the mutation sometimes causes interference due to excessive curvature mutation can not be processed

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  • A Method for Adjusting the Position and Posture of the Tool Axis in the Grinding Process of Blade Parts
  • A Method for Adjusting the Position and Posture of the Tool Axis in the Grinding Process of Blade Parts
  • A Method for Adjusting the Position and Posture of the Tool Axis in the Grinding Process of Blade Parts

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Embodiment Construction

[0026] The present invention will be described in detail below in conjunction with specific embodiments.

[0027] The blade parts are: the intake and exhaust edges of precision forged blades of aero-engines, and the grinding equipment is: a seven-axis linkage CNC abrasive belt grinder, which is connected to the adjustment module, and the blade type is set in the adjustment module. A method for adjusting the position and orientation of a tool shaft for grinding a part, comprising the following steps:

[0028] Step 1, establish the knife contact coordinate system ζ (L) and workpiece coordinate system ζ (w) , ξ (L) =[P c ; e 1 (L) ,e 2 (L) ,e 3 (L) ], P c is the contact point between the tool and the tool touch track r(t) on the surface to be processed at the current moment, e 1 (L) is the tool touch trajectory at the cutting point P c The unit tangent vector at, e 3 (L) For the processed surface r(u, v) at the cutting point P c The unit normal vector at e 2 (L)...

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Abstract

The invention discloses a method for adjusting the position and posture of the blade-like parts grinding tool shaft, which includes the following steps: Step 1, establishing the tool contact coordinate system ξ (L) and workpiece coordinate system ξ (w) , the tool axis vector is expressed in the workpiece coordinate system as: where α is the heel angle of the contact surface between the tool and the workpiece, and β is the side slip angle of the contact surface between the tool and the workpiece; step 2, discretize the tool contact, and get Angle θ between the tool axis vector at the i-th tool contact point and the tool-axis vector at the i+1th tool contact point i,i+1 , according to the formula to calculate the angular velocity ω between knife contact i and knife contact i+1 i,i+1 ; Step 3, establish the optimization objective function, obtain the tool axis vector attitude satisfying the minimum angular velocity according to the optimization objective function, and solve the kinematic relationship of each axis of the CNC grinding machine. It can realize the smooth processing of the tool during the grinding process, avoid overcutting or interference at the abrupt curvature of the blade parts, and ensure the surface processing quality.

Description

technical field [0001] The invention relates to the grinding processing of blade parts, in particular to a method for adjusting the position and posture of a blade shaft during grinding processing of blade parts. Background technique [0002] When grinding blade parts with sudden curvature changes, the grinding effect is best when the normal vector direction coincides with the tool axis vector direction. However, for complex surface parts with sudden changes in curvature, if the tool axis vector is controlled to coincide with the surface normal vector for grinding, it will cause the edge of the part to be overcut due to the sudden change of the tool axis vector during the grinding process. Interference occurs, and the motion axis of the high-end CNC grinding equipment exceeds the motion thread. [0003] At present, segmental grinding is generally used for edge grinding of blade parts with sudden curvature changes. In the process of segmental grinding, the sharp angle pheno...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G05B19/19
Inventor 张明德杨文科李芋林
Owner CHONGQING UNIV OF TECH
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