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Error compensation based corner processing precision control method

A technology of machining accuracy and control method, which is applied in the field of corner machining accuracy control based on error compensation, can solve the problems of low machining accuracy, large error, high requirements for machine tools and numerical control systems, and achieves high machining accuracy, low cost, and improved prediction accuracy. Effect

Inactive Publication Date: 2017-01-18
HARBIN UNIV OF SCI & TECH
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Problems solved by technology

[0005] The present invention proposes a corner machining precision control method based on error compensation to solve the problems of low machining precision, high requirements on machine tools and numerical control systems, and large errors.

Method used

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  • Error compensation based corner processing precision control method
  • Error compensation based corner processing precision control method
  • Error compensation based corner processing precision control method

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specific Embodiment approach 1

[0029] Specific implementation mode one: as Figure 8 As shown, a corner machining accuracy control method based on error compensation includes the following steps:

[0030] Step 1: Establish a corner machining milling force model;

[0031] Step 11: Establish a microelement milling force model;

[0032] Step 1 and 2: Milling force model during corner machining;

[0033] Step 2: Establish a tool deformation model according to Step 1;

[0034] Step 3: Perform error iterative compensation on the tool compensation model established in Step 2, and obtain the corner machining tool path after compensation.

[0035] Firstly, UG is used to establish the workpiece model, select the tool geometric parameters, processing parameters and tool path, and then obtain the initial tool path, and then obtain the error according to the established tool deformation model, and compensate the tool path. The specific error compensation algorithm steps are as follows: read the coordinates of the to...

specific Embodiment approach 2

[0036] Specific embodiment two: the difference between this embodiment and specific embodiment one is: the specific process of establishing the microelement milling force model in the described step one by one is:

[0037] The geometric model of the arc cutting edge of the radius milling cutter is as follows: figure 1 As shown, the fillet milling cutter is composed of two parts: a circular arc surface and a cylindrical surface. The helical blades of the two parts intersect at the bottom surface of the cylindrical surface and the apex of the circular arc edge. The cutting edge of the radius milling cutter in the milling process is generally a circular arc edge. Therefore, the geometric analysis of the circular arc edge part and the helical edge part is carried out separately and a model with a limited cutting radius is established.

[0038] Let the radius of the fillet milling cutter be R, the radius of the arc be r, the nominal helix angle be β, right-handed, and the number of...

specific Embodiment approach 3

[0081] Specific embodiment three: the difference between this embodiment and specific embodiment one or two is: the specific process of the milling force model in the corner machining process in the step one or two is:

[0082] Transform the microelement milling force in the local coordinate system to the workpiece coordinate system. Then, the cutting condition formula of corner machining is brought into the microelement milling force formula, and the microelement milling force is integrated along the Z direction to obtain the instantaneous milling force at any time.

[0083] First, transform the cutting edge micro-element coordinate system to the tool instantaneous coordinate system, and transform the coordinate T 1 is the following formula:

[0084] [ T i ] = - cosφ j - ...

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Abstract

The present invention relates to an error compensation based corner processing precision control method and, more particularly, to a method for controlling corner processing precision based on error compensation. The invention is designed to solve the problems that the processing precision in prior art is low, the requirements for the machine tool and the numerical control system are high and the error is large. The method comprises the following steps: 1) establishing a milling force model for corner processing; 1A) establishing a micro-element milling force model; 1B) establishing a milling force model for the corner processing process; 2) establishing a cutter deformation model according to step 1; 3) conducting error iterative compensation to the cutter compensation model established in step 2 for the corner processing cutter path after compensation. The present invention facilitates the optimization of geometric kinematic errors, milling force errors, and thermal deformation errors in corner processing. The method of the invention plays an important role in improving the processing precision and the processing efficiency of corner milling and processing of a mold cavity. The invention finds applications in corner processing of mold cavities.

Description

technical field [0001] The invention relates to a corner machining accuracy control method based on error compensation. Background technique [0002] The machining error in the milling process refers to the error between the design surface of the workpiece and the actual machined surface. The sources of processing errors in mold cavity processing can be divided into constant value system errors and variable value system errors according to the causes of processing errors. The constant value system error includes the manufacturing error of the machine tool-tool-fixture, the wear error of each component of the machine tool and the error of the processing principle. The variable value system error includes the error caused by the deformation caused by tool wear, heat and force. The geometric motion error, the error caused by milling force and the error caused by thermal deformation are the main components of the corner machining error. [0003] In order to ensure the accurac...

Claims

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Application Information

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IPC IPC(8): G05B19/19
CPCG05B19/19G05B2219/35349
Inventor 岳彩旭朱磊丁云鹏史慧楠刘献礼
Owner HARBIN UNIV OF SCI & TECH
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