CN-117921058-B - Zero point positioning method for box part casting blank processing workpiece coordinate system

CN117921058BCN 117921058 BCN117921058 BCN 117921058BCN-117921058-B

Abstract

The invention discloses a zero point positioning method for a workpiece coordinate system of a box body part casting blank, which comprises the steps of S1, utilizing a correction combination assembly on a working platform and an alignment tool to initially position the zero point of the workpiece coordinate system of the box body part casting blank, S2, utilizing a vernier caliper to correct and position the zero point of the workpiece coordinate system of the box body part casting blank, S3, finely machining the box body part casting blank, S4, and utilizing the zero point of the workpiece coordinate system of the box body part casting blank to position and machine the follow-up part. The invention has the advantages of convenient operation, no need of clamping and aligning tools for each part, simple measurement, capability of meeting the requirements only by means of common measuring tools, labor intensity reduction, effective reduction of occupational diseases, two-time verification of each part, direct confirmation of the positioning and centering of the part during measurement, short auxiliary time and higher processing accuracy.

Inventors

LIU YUQING
ZHAO FENGXIAN
ZHANG JINDUO
LIN BINGTAO
WANG SHUAIBING
WANG HONGSHENG
YANG FAN
Qiu fan

Assignees

湖北三江航天红峰控制有限公司

Dates

Publication Date: 20260512
Application Date: 20231225

Claims (4)

1. A zero point positioning method for a box part casting blank processing workpiece coordinate system is characterized by comprising the following steps: S1, utilizing a correction combination assembly on a working platform and an alignment tool to initially position a zero point of a workpiece coordinate system of a casting blank of a first box part; S2, correcting and positioning a zero point of a workpiece coordinate system of the casting blank of the first box part by using a vernier caliper; s3, casting a blank for the first box part for finish machining; s4, adopting a first box part to cast blank workpiece coordinate system zero point positioning and processing for subsequent parts; the correction combination assembly comprises a T-shaped groove and a standard block, and the alignment tool comprises a dial indicator or a dial indicator; the step S1 specifically comprises the following steps: S11, placing a casting blank of the first box body part on a working platform of a milling machine, and performing preliminary positioning on two adjacent outer surfaces of a workpiece by utilizing a T-shaped groove and a standard block on the working platform; S12, roughly milling a Z positive plane, and removing 3/4 of machining allowance to obtain a Z-direction initial finish machining surface, wherein the surface Z0 is a Z-direction zero point of a workpiece coordinate system; S13, measuring and straightening two points, close to two ends, of the Y negative outer surface respectively by using a dial indicator to obtain a Y negative outer surface reference straight line, measuring and straightening two points, close to two ends, of the Y positive outer surface respectively by using the dial indicator to obtain a Y positive outer surface reference straight line, and obtaining a Y initial zero position Y0 by using the two straight lines; s14, obtaining an X-direction initial zero position X0 by the same method, and obtaining an initial workpiece coordinate system zero position (X0, y0, z 0) at the moment.
2. The method for locating zero points of a coordinate system of a workpiece machined by a box part casting blank according to claim 1, wherein the step S2 specifically comprises: S21, measuring two thicknesses of the Y positive shell, which are close to two ends respectively, by using a vernier caliper, and correcting the Y-direction zero point by using four thickness dimensions to obtain Y-direction correction zero point Y1; s22, obtaining a y-direction correction zero position y0 by using the same method; s23, obtaining a zero point (x 1, y1, Z0) of the workpiece coordinate system, and finishing a Z forward plane to obtain a zero point (x 1, y1, Z1) of the corrected workpiece coordinate system.
3. The method for locating zero points of a coordinate system of a workpiece machined by a box part casting blank according to claim 1, wherein the step S3 specifically comprises: s31, correcting zero points (x 1, y1, z 1) of a workpiece coordinate system of the box part casting blank by using a correction combination assembly, and finishing the inner surface; S32, correcting zero points (x 1, y1, z 1) of a workpiece coordinate system of the box part casting blank by using the correction combination assembly, and finishing the outer surface; S33, correcting zero points (x 1, y1, z 1) of the workpiece coordinate system of the box part casting blank by using the correction combination assembly, and finishing the rest sizes.
4. The method for locating zero points of a coordinate system of a workpiece machined by a box part casting blank according to claim 1, wherein the step S4 specifically comprises: S41, placing a second box part casting blank on a milling machine working platform, and performing preliminary positioning on two adjacent outer surfaces of a workpiece by utilizing a T-shaped groove and a standard block of the working platform; S42, roughly milling a Z positive plane, and removing 3/4 of machining allowance to obtain a Z initial finish machining surface, wherein the surface Z2 is a Z zero point of a second box part coordinate system; S43, correcting the zero point (x 1, y1, z 1) of the workpiece coordinate system by using the first piece correction as the zero point (x 2, y2, z 2) of the workpiece coordinate system of the casting blank of the second piece of box part; S44, correcting a workpiece coordinate system zero point by using a workpiece coordinate system zero point correction positioning method of the first box part casting blank to obtain a second box part casting blank corrected workpiece coordinate system zero point (x 3, y3, z 3); S45, correcting a workpiece coordinate system zero point (x 3, y3, z 3) by using the second box part casting blank, and finishing the rest sizes; S46, repeating the steps S41 to S45, and completing zero point positioning and machining of the coordinate system of the workpiece of the casting blank of the subsequent box part.

Description

Zero point positioning method for box part casting blank processing workpiece coordinate system Technical Field The invention relates to the technical field of machining, in particular to a zero point positioning method for a coordinate system of a workpiece machined by a box part casting blank. Background The geometric precision and the dimensional precision of the casting blank are not high, the surface roughness Ra is larger, the tolerance is large, the allowance is unevenly distributed, the accurate positioning and centering before machining are difficult, and the zero positioning of a workpiece coordinate system in machining is always a difficult problem in the industry. According to the traditional method, each piece of the dial indicator is adopted to conduct straightening and alignment, the fact that the positions are two points is finally determined, the actual situation of the whole surface cannot be represented, serious errors are prone to occur in alignment, machining in place often occurs in machining places, quality problems frequently occur, and each piece of casting blank needs to be straightened and positioned again before machining, coordinate values are calculated, and operation is complex. Disclosure of Invention Aiming at the defects or improvement demands of the prior art, the invention provides a zero point positioning method for a workpiece coordinate system of a box part casting blank, wherein the first part casting blank is processed by utilizing a dial indicator to perform detailed workpiece coordinate system zero point positioning, preliminary basic data are obtained, and data are obtained by utilizing the first part casting blank from the second part casting blank processing, so that the positioning is quickly corrected. In order to achieve the above purpose, the invention adopts the following technical scheme: a zero point positioning method for a box part casting blank processing workpiece coordinate system comprises the following steps: S1, utilizing a correction combination assembly on a working platform and an alignment tool to initially position a zero point of a workpiece coordinate system of a casting blank of a first box part; S2, correcting and positioning a zero point of a workpiece coordinate system of the casting blank of the first box part by using a vernier caliper; s3, casting a blank for the first box part for finish machining; s4, adopting a first box part to cast blank workpiece coordinate system zero point positioning and processing for subsequent parts. As the optimization of the scheme, the correction combination assembly comprises a T-shaped groove and a standard block, and the alignment tool comprises a dial indicator or a dial indicator. As a preferable aspect of the foregoing, step S1 specifically includes: S11, placing a casting blank of the first box body part on a working platform of a milling machine, and performing preliminary positioning on two adjacent outer surfaces of a workpiece by using a correction assembly on the working platform; s12, roughly milling a Z positive plane, and removing 3/4 of machining allowance to obtain a Z-direction initial finish machining surface, wherein the surface Z0 is a Z-direction zero point of a workpiece coordinate system; S13, measuring and straightening two points, close to two ends, of the Y negative outer surface respectively by using a dial indicator to obtain a Y negative outer surface reference straight line, measuring and straightening two points, close to two ends, of the Y positive outer surface respectively by using the dial indicator to obtain a Y positive outer surface reference straight line, and obtaining a Y initial zero position Y0 by using the two straight lines; s14, obtaining an X-direction initial zero position X0 by the same method, and obtaining an initial workpiece coordinate system zero position (X0, y0, z 0) at the moment. As a preferable aspect of the foregoing, step S2 specifically includes: S21, measuring two thicknesses of the Y positive shell, which are close to two ends respectively, by using a vernier caliper, and correcting the Y-direction zero point by using four thickness dimensions to obtain Y-direction correction zero point Y1; s22, obtaining a y-direction correction zero position y0 by using the same method; s23, obtaining a zero point (x 1, y1, Z0) of the workpiece coordinate system, and finishing a Z forward plane to obtain a zero point (x 1, y1, Z1) of the corrected workpiece coordinate system. As a preferable aspect of the foregoing, step S3 specifically includes: s31, correcting zero points (x 1, y1, z 1) of a workpiece coordinate system of the box part casting blank by using a correction combination assembly, and finishing the inner surface; S32, correcting zero points (x 1, y1, z 1) of a workpiece coordinate system of the box part casting blank by using the correction combination assembly, and finishing the outer surface; S33, correcting zero points (x 1, y1, z 1) of