CN102865847A

CN102865847A - Spline curve compensation method for measuring profile deviation based on path unit

Info

Publication number: CN102865847A
Application number: CN2012103813921A
Authority: CN
Inventors: 蔡锐龙; 孙艺华
Original assignee: BEIJING JINGDIAO Co Ltd
Current assignee: BEIJING JINGDIAO Co Ltd
Priority date: 2012-10-10
Filing date: 2012-10-10
Publication date: 2013-01-09
Anticipated expiration: 2032-10-10
Also published as: CN102865847B

Abstract

The invention belongs to the technical field of numerical control machining, and particularly relates to a spline curve compensation method for measuring profile deviation based on a path unit. The method comprises the following steps: selecting profile measurement points, measuring the profile measurement points one by one, and calculating the deviations between the measurement data of the measurement points and the standard profile data; mapping the calculated deviation data of the measurement points to a coordinate system, and connecting the deviation data points together with a spline curve; acquiring the deviation value of each of machining points from the spline curve; and compensating the deviation values to corresponding path points. According to the invention, the path unit is used as the object and the mode of spline error compensation is used to effectively avoid unsmooth inflection points of the path caused by a linear method, so that a compensation path can be more smooth, the high-precision and high-speed machining requirements can be met, a better surface effect can be acquired, and the path compensation can be carried out on a work piece with relatively large deformation; and the method is simple and easy to use, the programming efficiency is high, and the production cost can be effectively lowered.

Description

SPL compensation method based on the measurement profile variation of path unit

Technical field

The invention belongs to the CNC processing technology field, particularly a kind of SPL compensation method of the measurement profile variation based on path unit.

Background technology

During the contour machinings such as chamfering, for guaranteeing machining precision and the consistance of product batch machining, usually select particular jig to position; This locator meams, requirement to anchor clamps and operator is all very high, if there is position or angular deviation, or the workpiece stress deformation, the quality problems such as the chamfering width is inconsistent will appear in the product that processes, and have affected the qualification rate of product aesthetics and product.Along with improving constantly that Product Precision requires, the profile measurement compensation technique has appearred in the basis in the anchor clamps location, namely after product orientation clamps, profile to product carries out measurements and calculations, then will measure the deviation data that obtains compensates in the machining path, thereby guarantee the machining precision of product, improve qualification rate and the product quality of product.

At present, digital control system generally adopts the macroprogram method to realize measuring the path compensation of profile, owing to being subjected to the restriction of program itself, the contact of macroprogram between can not each measurement point of overall thinking when calculating, can only carry out the calculating between adjacent two measurement points, therefore, its graph of errors only can carry out with linear mode.When relatively large deviation appears in absolute fix and reference position, the path flex point of minute shape may occur at the measured node place like this, cause adding and rib occurs at finished surface man-hour, affect surface quality.For reducing the appearance of flex point, just need to take to increase the means such as measurement point or control supplied materials deflection and raising frock precision and reduce departure, virtually increased production cost; In addition, in the debug phase at technique initial stage, usually need to repeatedly debug macroprogram, this not only has relatively high expectations to the technician, and length consuming time, and cost is high.

Summary of the invention

The object of the invention is to overcome the deficiencies in the prior art, a kind of parameter setting method take path unit as object is provided, not only can eliminate the path flex point, guarantee the machined surface quality, and be simple and easy to usefulness, programming efficiency is high, effectively reduces production costs.

In order to solve the problems of the technologies described above, the present invention is achieved by the following technical solutions.

A kind of SPL compensation method of the measurement profile variation based on path unit may further comprise the steps:

A. selected some profile measurement points are measured one by one, and calculate respectively the deviation of each measurement point measurement data and baseline profile data;

B. the each point deviation data that calculates is mapped in the coordinate system, and adopts SPL that each variation strong point is coupled together, generate a batten deviation curve;

C. obtain the deviate of each processing stand from the batten deviation curve;

The deviate of each processing stand that D. will obtain compensates in the corresponding path point.

Preferably, among the described step B, smooth in any position for the path after guaranteeing to compensate, the optional position of described SPL is cut and is vowed continuously.

Compared with prior art, beneficial effect of the present invention is: the present invention is take path unit as object, adopt the mode of batten error compensation, the rough path flex point of effectively having avoided linear method to cause, compensating for path is fairing more, satisfy the high-precision high-speed processing request, obtained simultaneously better surface effect, can finish the path compensation to moderate finite deformation amount workpiece; And be simple and easy to usefulness, programming efficiency is high, effectively reduces production cost.

Description of drawings

Fig. 1 is the schematic flow sheet of measurement profile variation SPL provided by the invention compensation method.

Fig. 2 is the measurement data schematic diagram of the profile measurement point that provides of the embodiment of the invention.

Fig. 3 is the schematic diagram that the embodiment of the invention is used for explaining the computing method of measurement point measurement data and baseline profile data deviation.

Fig. 4 is the schematic diagram of the generation batten deviation curve that provides of the embodiment of the invention.

Fig. 5 is the machining path schematic diagram before and after the compensation that provides of the embodiment of the invention.

Embodiment

Below in conjunction with accompanying drawing and embodiment the present invention is described in further detail.

As shown in Figure 1, the SPL compensation method of the measurement profile variation based on path unit of the present invention may further comprise the steps:

Step 101, selected profile measurement point is measured one by one, and calculates the deviation of each measurement point measurement data and baseline profile data.

Fig. 2 has shown the schematic diagram to a square cross profile measurement, has selected ten measurement points in baseline profile curve S 1, and point 1 to point 10 is respectively the position that ten measurement point actual measurements go out.

Fig. 3 has explained the computing method of measurement point measurement data and baseline profile data deviation, namely deviate △ ε=± actual spot of measurement is to the vertical range of baseline profile curve, measurement point be positioned at the baseline profile outside get on the occasion of, be positioned at the inboard negative value of getting.

Step 102 is mapped to the each point deviation data that calculates in the coordinate system, and adopts SPL that each variation strong point is coupled together, and generates a batten deviation curve.

As shown in Figure 4, coordinate laterally is defined as the expanded position of product profile each point, and namely horizontal line S1 ' has represented the evolute of baseline profile curve S 1; Coordinate vertically is defined as the departure of measurement data.According to the deviate that step 101 is calculated, corresponding coordinate points is found in the position that corresponds respectively to measurement point 1 to 10, then couples together with SPL M.Simultaneously, play the end point when avoiding SPL M to generate and cut and vow the inconsistent a little processing effect at 1 place that affect, the first and last point of SPL M is cut vowed and adjust, make the first and last point cut arrow continuous.

Step 103 is obtained the deviate of each processing stand from batten deviation curve M.

Step 104 compensates to the deviate of each processing stand of obtaining in the step 103 in the corresponding path point.

Fig. 5 has shown the contour path signal before and after the compensation.As shown in Figure 5, curve L1 is the baseline profile machining path that square cross generates, and curve L1 ' is the actual machining path after compensating.

Although above the present invention is had been described in detail, the invention is not restricted to this, those skilled in the art can carry out various modifications according to principle of the present invention.Therefore, all modifications of doing according to the principle of the invention all should be understood to fall into protection scope of the present invention.

Claims

1. based on the SPL compensation method of the measurement profile variation of path unit, it is characterized in that: comprise the steps:

C. obtain the deviate of each processing stand from the batten deviation curve;

2. the SPL compensation method of the measurement profile variation based on path unit according to claim 1 is characterized in that: the optional position of SPL described in the step B is cut and is vowed continuously.