阅读说明：本技术 基于双接触式工件测头的数控机床在机测量方法 (Numerical control machine tool on-machine measuring method based on double-contact workpiece measuring head ) 是由 李昆 于 2021-09-18 设计创作，主要内容包括：本发明涉及一种基于双接触式工件测头的数控机床在机测量方法,包括：采用标准件对第一接触式工件测头进行标定；采用标准件对第二接触式工件测头进行标定,其中,第一测球测针的直径大于第二测球测针的直径；将工件固定在数控机床的工作台后,数控机床先通过第一接触式工件测头对工件进行基准定位,然后,数控机床通过第二接触式工件测头对工件进行第一特征测量,再根据第一特征测量更新数控机床中的系统参数；数控机床对工件加工,数控机床通过第二接触式工件测头对加工完成的工件进行第二特征测量,再根据第二特征测量记录工件的加工一致性。本发明应用于在机测量技术领域。(The invention relates to an on-machine measuring method of a numerical control machine tool based on a double-contact workpiece measuring head, which comprises the following steps: calibrating the first contact type workpiece measuring head by adopting a standard component; calibrating the second contact type workpiece measuring head by adopting a standard component, wherein the diameter of the first ball measuring probe is larger than that of the second ball measuring probe; after a workpiece is fixed on a workbench of a numerical control machine tool, the numerical control machine tool firstly carries out datum positioning on the workpiece through a first contact type workpiece measuring head, then carries out first characteristic measurement on the workpiece through a second contact type workpiece measuring head, and updates system parameters in the numerical control machine tool according to the first characteristic measurement; and the numerical control machine tool processes the workpiece, and the numerical control machine tool performs second characteristic measurement on the processed workpiece through the second contact type workpiece measuring head and records the processing consistency of the workpiece according to the second characteristic measurement. The invention is applied to the technical field of on-machine measurement.)

1. A numerical control machine tool on-machine measuring method based on a double-contact workpiece measuring head is characterized by comprising the following steps:

selecting a first contact type workpiece measuring head, installing a first ball measuring probe on the first contact type workpiece measuring head, and calibrating the first contact type workpiece measuring head by adopting a standard component; selecting a second contact type workpiece measuring head, installing a second ball measuring probe on the second contact type workpiece measuring head, and calibrating the second contact type workpiece measuring head by adopting a standard component, wherein the diameter of the first ball measuring probe is larger than that of the second ball measuring probe;

after a workpiece is fixed on a workbench of a numerical control machine tool, the numerical control machine tool firstly carries out datum positioning on the workpiece through a first contact type workpiece measuring head, then carries out first characteristic measurement on the workpiece through a second contact type workpiece measuring head, and updates system parameters in the numerical control machine tool according to the first characteristic measurement;

and the numerical control machine tool processes the workpiece, after the workpiece is processed, the numerical control machine tool performs second characteristic measurement on the processed workpiece through the second contact type workpiece measuring head, and then records the processing consistency of the workpiece according to the second characteristic measurement.

2. A method according to claim 1, wherein the workpiece is placed on a workbench of the numerical control machine, after the workpiece is clamped by a clamp, the numerical control machine firstly performs reference positioning on the workpiece by a first contact type workpiece measuring head, then performs first characteristic measurement on the workpiece by the numerical control machine through a second contact type workpiece measuring head, and updates system parameters in the numerical control machine according to the first characteristic measurement.

3. A numerically controlled machine tool measuring method based on a double contact type workpiece measuring head according to claim 1, wherein the length of the first ball measuring probe is longer than the length of the second ball measuring probe.

4. A numerically controlled machine tool measuring method based on a double contact type workpiece measuring head according to claim 1, wherein the diameter of the first ball measuring probe is 6mm, and the diameter of the second ball measuring probe is 2 mm.

5. The on-machine measuring method of a numerical control machine based on a double-contact workpiece measuring head according to claim 1, characterized in that a first contact workpiece measuring head is selected, a first ball measuring probe is installed on the first contact workpiece measuring head, the first contact workpiece measuring head is installed on a main shaft of the numerical control machine, parameters of the first contact workpiece measuring head are adjusted on the numerical control machine to be connected and paired with a receiver of the numerical control machine, a dial indicator is used for carrying out first centering adjustment on the first ball measuring probe, then a measuring head length calibration program in the numerical control machine is operated, length calibration is carried out on the first ball measuring probe, a measuring head radius and offset calibration program in the numerical control machine is operated, radius and offset calibration are carried out on the first ball measuring probe, and then a ring cutter changing instruction of the numerical control machine is operated, and placing the first contact type workpiece measuring head in a tool magazine.

6. A numerically controlled machine tool measuring method based on a double contact type workpiece measuring head according to claim 5, wherein the accuracy of the first centering adjustment is less than 2 um.

7. A numerical control machine tool on the basis of a double-contact workpiece measuring head according to claim 5, characterized in that the workpiece is placed on a workbench of the numerical control machine tool, after the workpiece is clamped by a clamp, the numerical control machine tool calls out the first contact workpiece measuring head from the tool magazine, then the numerical control machine tool measures a reference characteristic of the workpiece through the first contact workpiece measuring head and sets a machining coordinate system, after the measurement is completed, the numerical control machine tool puts the first contact workpiece measuring head back to the tool magazine, then the numerical control machine tool performs first characteristic measurement on the workpiece through the second contact workpiece measuring head, and then system parameters in the numerical control machine tool are updated according to the first characteristic measurement.

8. The on-machine measuring method of a numerical control machine based on a double-contact workpiece measuring head according to claim 1, characterized in that a second contact workpiece measuring head is selected, a second ball measuring probe is installed on the second contact workpiece measuring head, the second contact workpiece measuring head is installed on a main shaft of the numerical control machine, parameters of the second contact workpiece measuring head are adjusted on the numerical control machine to be connected and paired with a receiver of the numerical control machine, a dial indicator is used for carrying out second centering adjustment on the second ball measuring probe, then a measuring head length calibration program in the numerical control machine is operated, length calibration is carried out on the second ball measuring probe, a measuring head radius and offset calibration program in the numerical control machine is operated, radius and offset calibration are carried out on the second ball measuring probe, and a ring cutter changing instruction of the numerical control machine is operated, and placing the second contact type workpiece measuring head in a tool magazine.

9. A numerically controlled machine tool measuring method based on a double contact type workpiece measuring head according to claim 8, wherein the accuracy of the second centering adjustment is less than 2 um.

Technical Field

The invention relates to the technical field of on-machine measurement, in particular to an on-machine measurement method of a numerical control machine tool based on a double-contact workpiece measuring head.

Background

Contact type workpiece measuring heads are widely applied to on-machine measurement of workpieces of numerical control machines. Before machining, the contact type workpiece measuring head is used for positioning the reference characteristics of the workpiece and establishing a workpiece coordinate system. In the machining process, the contact type workpiece measuring head is used for measuring the actual allowance of the workpiece to update system parameters, so that the cutting adapts to the change in the machining process of the workpiece. After machining, the contact type workpiece measuring head is used for detecting the key features of the workpiece and recording the consistency condition of the workpiece, so that historical tracking of the key features is achieved, the condition of the machine tool is monitored, and a maintenance plan is made. The numerical control machine tool is often only provided with one contact type workpiece measuring head, and in order to reduce the influence of workpiece finish on measurement, a measuring needle of the contact type workpiece measuring head usually adopts a large-diameter ball head, so that the reference positioning operation can be effectively carried out on the workpiece. During or after machining, when some key small features of a workpiece, such as small holes, small grooves and the like, are measured, a measuring needle of a small-diameter measuring ball needs to be replaced for a contact type workpiece measuring head to meet the requirement of workpiece measurement. When the workpiece is positioned, the measuring probe of the small-diameter measuring ball needs to be replaced by the measuring probe of the large-diameter measuring ball. After the measuring needle is replaced, the measuring needle ball head needs to be centered and adjusted on the machine tool again, and measuring head parameters of the contact type workpiece measuring head need to be calibrated again by using a standard part, so that the effective processing time of the numerical control machine tool is occupied. Especially, when workpieces are produced and processed in batch, the measuring pins are required to be frequently replaced during workpiece measurement, and the processing efficiency of the workpieces is greatly reduced.

Disclosure of Invention

(1) Technical problem to be solved

The embodiment of the invention provides an on-machine measuring method of a numerical control machine tool based on a double-contact workpiece measuring head, which solves the technical problem of low machining efficiency of a workpiece machined by the numerical control machine tool.

(2) Technical scheme

In order to solve the technical problem, an embodiment of the present invention provides an on-machine measurement method for a numerical control machine based on a dual-contact workpiece probe, including:

selecting a first contact type workpiece measuring head, installing a first ball measuring probe on the first contact type workpiece measuring head, and calibrating the first contact type workpiece measuring head by adopting a standard component; selecting a second contact type workpiece measuring head, installing a second ball measuring probe on the second contact type workpiece measuring head, and calibrating the second contact type workpiece measuring head by adopting a standard component, wherein the diameter of the first ball measuring probe is larger than that of the second ball measuring probe;

after a workpiece is fixed on a workbench of a numerical control machine tool, the numerical control machine tool firstly carries out datum positioning on the workpiece through a first contact type workpiece measuring head, then carries out first characteristic measurement on the workpiece through a second contact type workpiece measuring head, and updates system parameters in the numerical control machine tool according to the first characteristic measurement;

and the numerical control machine tool processes the workpiece, after the workpiece is processed, the numerical control machine tool performs second characteristic measurement on the processed workpiece through the second contact type workpiece measuring head, and then records the processing consistency of the workpiece according to the second characteristic measurement.

Optionally, the workpiece is placed on a workbench of the numerical control machine, after the workpiece is clamped by a clamp, the numerical control machine firstly performs reference positioning on the workpiece through a first contact type workpiece measuring head, then performs first characteristic measurement on the workpiece through a second contact type workpiece measuring head, and updates system parameters in the numerical control machine according to the first characteristic measurement.

Optionally, the length of the first ball measuring probe is greater than the length of the second ball measuring probe.

Optionally, the diameter of the first ball measuring probe is 6mm, and the diameter of the second ball measuring probe is 2 mm.

Optionally, a first contact type workpiece measuring head is selected, a first ball measuring probe is installed on the first contact type workpiece measuring head, the first contact type workpiece measuring head is installed on a main shaft of the numerical control machine, parameters of the first contact type workpiece measuring head are adjusted on the numerical control machine to enable the first contact type workpiece measuring head to be connected and paired with a receiver of the numerical control machine, a dial gauge is used for conducting first centering adjustment on the first ball measuring probe, then a measuring head length calibration program in the numerical control machine is operated, length calibration is conducted on the first ball measuring probe, a measuring head radius and offset calibration program in the numerical control machine is operated, radius and offset calibration is conducted on the first ball measuring probe, then a ring tool changing instruction of the numerical control machine is operated, and the first contact type workpiece measuring head is placed in a tool magazine.

Optionally, the accuracy of the first centering adjustment is less than 2 um.

Optionally, the workpiece is placed on a workbench of the numerical control machine tool, after the workpiece is clamped by a clamp, the numerical control machine tool calls the first contact type workpiece measuring head out of the tool magazine, then the numerical control machine tool measures the datum characteristic of the workpiece through the first contact type workpiece measuring head and sets a machining coordinate system, after the measurement is completed, the numerical control machine tool puts the first contact type workpiece measuring head back into the tool magazine, then the numerical control machine tool performs first characteristic measurement on the workpiece through the second contact type workpiece measuring head, and then system parameters in the numerical control machine tool are updated according to the first characteristic measurement.

Optionally, selecting a second contact type workpiece measuring head, installing a second ball measuring probe on the second contact type workpiece measuring head, installing the second contact type workpiece measuring head on a spindle of the numerical control machine tool, adjusting parameters of the second contact type workpiece measuring head on the numerical control machine tool to enable the second contact type workpiece measuring head to be connected and paired with a receiver of the numerical control machine tool, performing second centering adjustment on the second ball measuring probe by using a dial gauge, then operating a measuring head length calibration program in the numerical control machine tool, performing length calibration on the second ball measuring probe, operating a measuring head radius and offset calibration program in the numerical control machine tool, performing radius and offset calibration on the second ball measuring probe, operating a ring tool changing instruction of the numerical control machine tool, and placing the second contact type workpiece measuring head in a tool magazine.

Optionally, the precision of the second centering adjustment is less than 2 um.

(3) Advantageous effects

In summary, when the numerical control machine tool based on the dual-contact workpiece measuring head is used for machining a workpiece in the on-machine measuring method, the ball measuring probe does not need to be frequently replaced, the first contact workpiece measuring head and the second contact workpiece measuring head can be used alternately, the first contact workpiece measuring head is used for carrying out datum positioning on the workpiece, and the second contact workpiece measuring head is used for carrying out first characteristic measurement on the workpiece, wherein the first characteristic measurement is used for detecting small characteristics of a key part of the workpiece. And then, carrying out second characteristic measurement on the machined workpiece by using a second contact type workpiece measuring head, wherein the second characteristic measurement refers to the measurement of small characteristics of the key part of the workpiece. The replacement time of the ball measuring probe can be saved, the calibration time of the ball measuring probe is reduced, and the processing efficiency and the utilization rate of a numerical control machine tool are improved.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments of the present invention will be briefly described below, and it is obvious that the drawings described below are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

Fig. 1 is an application scene diagram of a numerical control machine tool on-machine measurement method based on a double-contact workpiece measuring head in an embodiment of the invention;

fig. 2 is a flowchart of an on-machine measurement method of a numerically-controlled machine tool based on a dual-contact workpiece probe according to an embodiment of the present invention.

In the figure:

1-a main shaft; 2-tool magazine; 3-a first contact workpiece probe; 4-a second contact workpiece probe; 5-a receiver; 6-a workpiece; 7-a workbench.

Detailed Description

The embodiments of the present invention will be described in further detail with reference to the drawings and examples. The following detailed description of the embodiments and the accompanying drawings are provided to illustrate the principles of the invention and are not intended to limit the scope of the invention, i.e., the invention is not limited to the embodiments described, but covers any modifications, alterations, and improvements in the parts, components, and connections without departing from the spirit of the invention.

It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present application will be described in detail below with reference to the embodiments with reference to the attached drawings.

Referring to fig. 1 to 2, an on-machine measurement method of a numerical control machine tool based on a dual-contact workpiece probe includes:

selecting a first contact type workpiece measuring head 3, installing a first ball measuring probe on the first contact type workpiece measuring head 3, and calibrating the first contact type workpiece measuring head 3 by adopting a standard component; selecting a second contact type workpiece measuring head 4, installing a second ball measuring probe on the second contact type workpiece measuring head 4, and calibrating the second contact type workpiece measuring head 4 by adopting a standard component, wherein the diameter of the first ball measuring probe is larger than that of the second ball measuring probe;

after a workpiece 6 is fixed on a workbench 7 of a numerical control machine tool, the numerical control machine tool firstly carries out reference positioning on the workpiece 6 through a first contact type workpiece measuring head 3, then carries out first characteristic measurement on the workpiece 6 through a second contact type workpiece measuring head 4, and updates system parameters in the numerical control machine tool according to the first characteristic measurement;

and the numerical control machine tool processes the workpiece 6, after the processing is finished, the numerical control machine tool performs second characteristic measurement on the processed workpiece 6 through the second contact type workpiece measuring head 4, and then records the processing consistency of the workpiece 6 according to the second characteristic measurement.

When the numerical control machine tool based on the double-contact workpiece measuring head is used for machining the workpiece 6 by the machine measuring method, the ball measuring probe does not need to be frequently replaced, the first contact workpiece measuring head 3 and the second contact workpiece measuring head 4 can be used alternately, the first contact workpiece measuring head 3 is used for conducting datum positioning on the workpiece 6, the second contact workpiece measuring head 4 is used for conducting first characteristic measurement on the workpiece 6, and the first characteristic measurement is used for detecting small characteristics of key parts of the workpiece 6. And then, carrying out second characteristic measurement on the machined workpiece 6 by using the second contact type workpiece measuring head 4, wherein the second characteristic measurement refers to the measurement of small characteristics of key parts of the workpiece 6. The replacement time of the ball measuring probe can be saved, the calibration time of the ball measuring probe is reduced, and the processing efficiency and the utilization rate of a numerical control machine tool are improved.

In an embodiment, the workpiece 6 is placed on a workbench 7 of the numerical control machine, after the workpiece 6 is clamped by a fixture, the numerical control machine performs reference positioning on the workpiece 6 through the first contact type workpiece measuring head 3, then performs first characteristic measurement on the workpiece 6 through the second contact type workpiece measuring head 4, and updates system parameters in the numerical control machine according to the first characteristic measurement.

In one embodiment, the length of the first ball measuring probe is greater than the length of the second ball measuring probe.

In one embodiment, the first ball measuring probe has a diameter of 6mm and the second ball measuring probe has a diameter of 2 mm.

In one embodiment, a first contact type workpiece measuring head 3 is selected, a first ball measuring probe is installed on the first contact type workpiece measuring head 3, the first contact type workpiece measuring head 3 is installed on a main shaft 1 of the numerical control machine tool, adjusting the parameters of the first contact type workpiece measuring head 3 on the numerical control machine tool to enable the first contact type workpiece measuring head to be connected and paired with a receiver 5 of the numerical control machine tool, then adopting a dial indicator to carry out first centering adjustment on the first ball measuring probe, then operating a measuring head length calibration program in the numerical control machine tool, calibrating the length of the first ball measuring probe, operating a measuring head radius and offset calibration program in the numerical control machine, and calibrating the radius and the offset of the first ball measuring stylus, operating a ring tool changing instruction of the numerical control machine tool, and placing the first contact type workpiece measuring head 3 in the tool magazine 2. The centering time of the ball head of the measuring probe is reduced, and the efficiency is improved.

In an embodiment, the accuracy of the first centering adjustment is less than 2 um.

In an embodiment, the workpiece 6 is placed on a workbench 7 of the numerical control machine tool, after the workpiece 6 is clamped by a fixture, the numerical control machine tool calls the first contact type workpiece measuring head 3 out of the tool magazine 2, then the numerical control machine tool measures the reference feature of the workpiece 6 through the first contact type workpiece measuring head 3 and sets a machining coordinate system, after the measurement is completed, the numerical control machine tool places the first contact type workpiece measuring head 3 back into the tool magazine 2, then the numerical control machine tool performs first feature measurement on the workpiece 6 through the second contact type workpiece measuring head 4, and then system parameters in the numerical control machine tool are updated according to the first feature measurement.

In one embodiment, a second contact type workpiece measuring head 4 is selected, a second ball measuring probe is installed on the second contact type workpiece measuring head 4, the second contact type workpiece measuring head 4 is installed on the main shaft 1 of the numerical control machine tool, adjusting the parameters of the second contact type workpiece measuring head 4 on the numerical control machine tool to enable the second contact type workpiece measuring head to be connected and paired with a receiver 5 of the numerical control machine tool, then adopting a dial indicator to carry out second centering adjustment on the second ball measuring probe, then operating a measuring head length calibration program in the numerical control machine tool, calibrating the length of the second ball measuring probe, operating a measuring head radius and offset calibration program in the numerical control machine, and calibrating the radius and the offset of the second ball measuring stylus, operating a ring tool changing instruction of the numerical control machine tool, and placing the second contact type workpiece measuring head 4 in the tool magazine 2.

In one embodiment, the accuracy of the second centering adjustment is less than 2 um.

Based on the combination of the above embodiments, in an embodiment, the on-machine measurement method of the numerical control machine tool based on the dual-contact workpiece probe includes:

step 1: a first ball measuring probe is arranged on the first contact type workpiece measuring head 3, the first ball measuring probe is preferably a long measuring probe, and the diameter of a measuring ball is preferably 6 mm;

step 2: installing a first contact type workpiece measuring head 3 on a main shaft 1 of a machine tool, and adjusting parameters of the first contact type workpiece measuring head 3 to establish connection with a receiver 5 so as to complete pairing;

and step 3: performing first centering adjustment on the first ball measuring probe by using a dial indicator, preferably, controlling the precision of the first centering adjustment within 2 micrometers;

and 4, step 4: establishing a measuring head type in a numerical control machine tool cutter table, loading the measuring head type into the current spindle 1, and establishing connection between a first contact type workpiece measuring head 3 and a receiver 5;

and 5: running a length calibration program of the numerical control machine tool, and using a reference surface to calibrate the length of the first contact type workpiece measuring head 3;

step 6: operating a measuring head radius and bias calibration program, and calibrating the radius and bias of the first contact type workpiece measuring head 3 by using a standard ball or ring gauge;

and 7: operating a tool changing instruction, and placing a first contact type workpiece measuring head 3 in a tool magazine 2;

and 8: mounting a second ball measuring probe on the second contact type workpiece measuring head 4, wherein the measuring probe is preferably a short measuring probe, and the diameter of the second ball measuring probe is preferably 2 mm;

and step 9: manually installing a second contact type workpiece measuring head 4 on a main shaft 1 of the numerical control machine tool, and adjusting parameters of the second contact type workpiece measuring head 4 to enable the second contact type workpiece measuring head to be connected with a receiver 5 to complete pairing;

step 10: centering and adjusting the ball head of the measuring probe by using a dial indicator, preferably, the centering precision is controlled within 2 mu m;

step 11: a measuring head length calibration program is operated, and the length calibration is carried out on the second contact type workpiece measuring head 4 by using the reference surface;

step 12: operating a measuring head radius and bias calibration program, and calibrating the radius and bias of the second contact type workpiece measuring head 4 by using a standard ball or ring gauge;

step 13: operating a tool changing instruction, and placing a second contact type workpiece measuring head 4 in the tool magazine 2;

step 14: placing a workpiece 6 on a workbench 7, clamping the workpiece 6 by using a clamp, calling out a first contact type workpiece measuring head 3 from the tool magazine 2, measuring the reference characteristic of the workpiece 6, setting a machining coordinate system, and after the measurement is finished, placing the first contact type workpiece measuring head 3 back to the tool magazine 2;

step 15: when the first characteristic measurement needs to be carried out on the workpiece in the machining process, the second contact type workpiece measuring head 4 is called out from the tool magazine 2 to carry out measurement and update system parameters, and after the measurement is finished, the second contact type workpiece measuring head 4 is placed back to the tool magazine 2.

Step 16: and after the machining is finished, calling out a second contact type workpiece measuring head 4 from the tool magazine 2, measuring a second characteristic of the workpiece, recording the machining consistency of the workpiece, and after the measurement is finished, placing the second contact type workpiece measuring head 4 back to the tool magazine 2.

The above description is only an example of the present application and is not limited to the present application. Various modifications and alterations to this application will become apparent to those skilled in the art without departing from the scope of this invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.