Contact type three-coordinate measuring machine and measuring method

Abstract

The invention discloses a contact type three-coordinate measuring machine and a measuring method, and belongs to the technical field of three-coordinate measuring machines. The measuring method comprises the following steps: S1, acquiring coordinate values of standard shapes of all detection paths of a standard workpiece in different temperature ranges and coordinate values of corresponding contact type measuring heads through a three-coordinate measuring machine; s2, obtaining coordinate values of a to-be-detected shape of a preset detection path of the to-be-detected workpiece through a three-coordinate measuring machine; s3, acquiring a current temperature and a current detection path, and comparing the current detection path with the preset detection path; s4, presetting a coordinate deviation threshold range between the coordinate value of the standard shape and the coordinate value of the to-be-measured shape; s5, whether the coordinate difference between the coordinate value of the to-be-detected shape of the current detection path and the coordinate value of the corresponding standard shape is within the coordinate deviation threshold range or not is judged; according to the measuring method of the contact type three-coordinate measuring machine, the workpiece can be measured more accurately.

Description

Technical Field

[0001] The invention relates to the technical field of three-coordinate measuring machines, and in particular to a contact type three-coordinate measuring machine and a measuring method. Background Art

[0002] The three-dimensional coordinate measuring machine obtains the spatial coordinate information of the contact point through contact measurement, reflecting the actual manufacturing size and surface flatness of the parts, and is widely used in laboratory scientific research and industrial production. The existing measurement methods of three-dimensional coordinate measuring machines have the following problems: first, the digital model of the part to be measured is input into the measuring machine in advance, and then the actual value is determined by measurement whether it is within the preset digital model. If it is, the shape is judged to be correct, otherwise the shape and position are judged to be incorrect. This method is not accurate enough to measure the workpiece; second, the three-dimensional coordinate measuring machine is affected by temperature during measurement, which will also make the measurement of the workpiece inaccurate; third, the wear of the equipment and the wear of the contact probe make the measurement of the workpiece inaccurate. Summary of the invention

[0003] In order to solve the problems of the prior art, the present invention provides a contact type three-coordinate measuring machine and a measuring method.

[0004] In one aspect, a contact type three-dimensional coordinate measuring machine measurement method is provided, the method comprising: S1: Obtain the coordinate values ​​of the standard shapes of all detection paths of the standard workpiece under different temperature ranges and the coordinate values ​​of the corresponding contact probes through a three-dimensional coordinate measuring machine; S2: Obtaining the coordinate value of the shape to be measured of the preset detection path of the workpiece to be measured by a three-dimensional coordinate measuring machine; S3: Acquire the current temperature and the current detection path, and compare the current detection path with the preset detection path; S4: Presetting a coordinate deviation threshold range between the coordinate values ​​of the standard shape and the coordinate values ​​of the shape to be measured; S5: Determine whether the coordinate difference between the coordinate value of the shape to be measured in the current detection path and the coordinate value of the corresponding standard shape is within the coordinate deviation threshold range. If not, it means that the shape size and shape position of the current detection path of the workpiece to be measured are incorrect. If so, it means that the shape size and shape position of the current detection path of the workpiece to be measured are correct. Furthermore, if the shape, size and shape position of the current detection path of the workpiece to be measured are correct, the method further includes: S6: triggering the contact probe to generate a signal.

[0005] Furthermore, if the shape, size and shape position of the current detection path of the workpiece to be measured are incorrect, the method further includes S7: compensating for the temperature of the workpiece to be measured and the wear error of the contact probe.

[0006] On the other hand, a contact type three-dimensional coordinate measuring machine is provided, comprising a contact type three-dimensional coordinate measuring system and a contact type probe; The contact type three-coordinate measurement system comprises a main control module; the contact type probe is connected to the main control module; the main control module is also connected to a control module, a temperature detection module and an input module, which are used to coordinate the cooperation between the modules through the main control module; Control module: used for controlling the contact type three-dimensional coordinate measuring machine to detect the coordinate value of the shape to be measured of the preset detection path of the workpiece to be measured; Temperature detection module: used to obtain the current contact coordinate measuring machine temperature and detect the ambient temperature; The input module includes a first input module and a second input module, and a comparison and analysis unit is provided between the first input module and the second input module for obtaining the wear error of the contact probe; The first input module is used to input the shape and precision coordinate values ​​of the standard workpiece; The second input module is used to input the shape and precision coordinate value of the workpiece to be measured; The comparison and analysis unit includes a comparison module, an adjustment module, a calculation module and a judgment module connected in sequence; Comparison module: used to compare the shape and precision coordinate values ​​of the workpiece to be measured with the shape and precision coordinate values ​​of the standard workpiece; Adjustment module: used to make the boundary position of the shape of the workpiece to be measured and the shape of the standard workpiece evenly close; Calculation module: used to calculate the distance between any shape point of the workpiece to be measured and the corresponding shape point of the standard workpiece shape; The judgment module is used to store the distance threshold and judge the size between the distance and the distance threshold.

[0007] Furthermore, the comparison and analysis unit also includes an error compensation module, which is connected to the judgment module and the main control module and is used to compensate for the temperature and contact probe wear errors of the workpiece to be measured.

[0008] Furthermore, the contact type three-coordinate measuring system further comprises a probe trigger module, which is connected to the main control module and the contact type probe and is used to control the contact type probe to trigger and generate a signal; The technical solution provided by the embodiment of the present invention has the following beneficial effects: when measuring the shape of a workpiece, since the temperature of the three-dimensional coordinate measuring machine changes with the temperature of the detection environment, when measuring the workpiece, the shape of the surface of the three-dimensional coordinate measuring machine will change. The coordinate values ​​of the standard shapes of all detection paths of the standard workpiece under different temperature ranges are detected in advance by the three-dimensional coordinate measuring machine, for example, about 10 to 20°C, and once at 20 to 30°C. When detecting the coordinate values ​​of the shape to be measured of the preset detection path of the workpiece to be measured, the coordinate values ​​of the standard shape in the corresponding temperature range are compared according to the detection temperature at that time, and the shape and precision coordinate values ​​of the workpiece to be measured are compared with the shape and precision coordinate values ​​of the standard workpiece; it is judged whether the shape size and shape position of the current preset detection path of the workpiece to be measured are correct. If the shape size and shape position of the current preset detection path of the workpiece to be measured are correct, the contact probe is triggered to generate a signal, so that the workpiece measurement is more accurate; Secondly, due to the wear of the three-dimensional coordinate measuring machine and the wear of the contact probe, the workpiece measurement is inaccurate. By judging that the coordinate difference between the coordinate value of the shape to be measured in the current detection path and the coordinate value of the corresponding standard shape is not within the coordinate deviation threshold range, it is known that the shape size and shape position of the current preset detection path of the workpiece to be measured are incorrect. The temperature and contact probe wear error compensation can be performed on the workpiece to be measured. After the error compensation, the contact probe continues to be triggered to generate a signal, making the measurement of the workpiece to be measured more accurate. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0010] Figure 1 It is a schematic diagram of the connection structure of the contact type three-dimensional coordinate measuring machine of the present invention; Figure 2 The present invention provides a relationship diagram of a shape diagram to be measured of a preset detection path of a workpiece to be measured, an upper coordinate deviation value, and a lower coordinate deviation value; Figure markings: 1-shape diagram to be measured; 2-upper coordinate deviation value; 3-lower coordinate deviation value; 4-main control module; 5-control module; 6-temperature detection module; 7-probe trigger module; 8-contact probe; 9-first input module; 10-second input module; 11-comparison module; 12-adjustment module; 13-calculation module; 14-judgment module; 15-error compensation module. DETAILED DESCRIPTION

[0011] In order to make the objectives, technical solutions and advantages of the present invention more clear, the embodiments of the present invention will be further described in detail below with reference to the accompanying drawings.

[0012] Example 1: See Figure 2 , a contact type three-dimensional coordinate measuring machine measurement method, comprising the following steps: S1: Obtain the coordinate values ​​of the standard shapes of all detection paths of the standard workpiece under different temperature ranges and the coordinate values ​​of the corresponding contact probes through a three-dimensional coordinate measuring machine; S2: Obtaining the coordinate value of the shape to be measured of the preset detection path of the workpiece to be measured by a three-dimensional coordinate measuring machine; S3: Acquire the current temperature and the current detection path, and compare the current detection path with the preset detection path; S4: Presetting a coordinate deviation threshold range between the coordinate values ​​of the standard shape and the coordinate values ​​of the shape to be measured; S5: Preset the detection path from a workpiece to be tested Figure 1 The relationship diagram between the upper coordinate deviation value 2 and the lower coordinate deviation value 3; Determine whether the coordinate difference between the coordinate value of the shape to be measured in the current detection path and the coordinate value of the corresponding standard shape is within the coordinate deviation threshold range. If not, it means that the shape size and shape position of the current detection path of the workpiece to be measured are incorrect. If so, it means that the shape size and shape position of the current detection path of the workpiece to be measured are correct. S6: trigger the contact probe to generate a signal; S7: Compensate for the temperature and contact probe wear errors of the workpiece to be measured; Example 2, see Figure 1 A contact type three-coordinate measuring machine comprises a contact type three-coordinate measuring system and a contact type probe, wherein the contact type three-coordinate measuring system comprises a main control module 4; the main control module 4 is connected to the contact type probe; The main control module 4 is also connected to a control module 5, a temperature detection module 6 and an input module, which are used to coordinate the cooperation between the modules through the main control module; Control module 5: used for controlling the contact type three-dimensional coordinate measuring machine to detect the coordinate value of the shape to be measured of the preset detection path of the workpiece to be measured; Temperature detection module 6: used to obtain the current temperature of the contact type three-dimensional coordinate measuring machine and detect the ambient temperature; The input module includes a first input module 9 and a second input module 10, and a comparison and analysis unit is provided between the first input module 9 and the second input module 10 for obtaining the wear error of the contact probe; The first input module 9 is used to input the shape and precision coordinate values ​​of the standard workpiece; The second input module 10 is used to input the shape and precision coordinate value of the workpiece to be measured; The comparison and analysis unit comprises a comparison module 11, an adjustment module 12, a calculation module 13 and a judgment module 14 connected in sequence; Comparison module 11: used to compare the shape and precision coordinate values ​​of the workpiece to be measured with the shape and precision coordinate values ​​of the standard workpiece; Adjustment module 12: used to make the boundary position of the shape of the workpiece to be measured and the shape of the standard workpiece evenly close; Calculation module 13: used to calculate the distance between any shape point of the workpiece shape to be measured and the shape point of the standard workpiece shape; The judging module 14 is used to store the distance threshold and judge the size between the distance and the distance threshold.

[0013] Error compensation module 15: The error compensation module 15 is connected to the judgment module 14 and the main control module 4, and is used to compensate for the coordinate value error between the shape of the workpiece to be measured and the shape of the standard workpiece; The probe trigger module 7 is connected to the main control module 4 and the contact probe 8 and is used to control the contact probe to trigger and generate a signal; It is worth noting that when measuring the shape of the workpiece, since the temperature of the three-dimensional coordinate measuring machine changes with the temperature of the detection environment, when measuring the workpiece, the shape of the surface of the three-dimensional coordinate measuring machine will change. The coordinate values ​​of the standard shape of all detection paths of the standard workpiece under different temperature ranges are detected in advance by the three-dimensional coordinate measuring machine, for example: about 10~20℃, and once at 20~30℃. When detecting the coordinate value of the shape to be measured of the preset detection path of the workpiece to be measured, the coordinate value of the standard shape in the corresponding temperature range is compared according to the detection temperature at that time, and the shape and precision coordinate value of the workpiece to be measured is compared with the shape and precision coordinate value of the standard workpiece; judge whether the shape size and shape position of the current preset detection path of the workpiece to be measured are correct. If the shape size and shape position of the current preset detection path of the workpiece to be measured are correct, the contact probe is triggered to generate a signal to make the workpiece measurement more accurate; Secondly, due to the wear of the three-dimensional coordinate measuring machine and the wear of the contact probe, the workpiece measurement is inaccurate. By judging that the coordinate difference between the coordinate value of the shape to be measured in the current detection path and the coordinate value of the corresponding standard shape is not within the coordinate deviation threshold range, it is known that the shape size and shape position of the current preset detection path of the workpiece to be measured are incorrect. The contact probe wear error is compensated by a computer connected to the three-dimensional coordinate measuring machine. The main control module is connected to the error compensation module. The contact probe wear error compensation parameters are set by the computer to complete the contact probe wear error compensation for the workpiece to be measured. At the same time, temperature compensation is performed. After the error compensation, the contact probe continues to be triggered to generate a signal, so that the measurement of the workpiece to be measured is more accurate.

[0014] The serial numbers of the above embodiments of the present invention are only for description and do not represent the advantages or disadvantages of the embodiments.

[0015] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A contact type three-dimensional coordinate measuring machine measurement method, characterized in that: The method comprises: S1: Obtain the coordinate values ​​of the standard shapes of all detection paths of the standard workpiece under different temperature ranges and the coordinate values ​​of the corresponding contact probes through a three-dimensional coordinate measuring machine; S2: Obtaining the coordinate value of the shape to be measured of the preset detection path of the workpiece to be measured by a three-dimensional coordinate measuring machine; S3: Acquire the current temperature and the current detection path, and compare the current detection path with the preset detection path; S4: Presetting a coordinate deviation threshold range between the coordinate values ​​of the standard shape and the coordinate values ​​of the shape to be measured; S5: Determine whether the coordinate difference between the coordinate value of the shape to be measured in the current detection path and the coordinate value of the corresponding standard shape is within the coordinate deviation threshold range. If not, it means that the shape size and shape position of the current detection path of the workpiece to be measured are incorrect. If so, it means that the shape size and shape position of the current detection path of the workpiece to be measured are correct.

2. A contact type three-dimensional coordinate measuring machine measurement method according to claim 1, characterized in that: If the shape, size and shape position of the current detection path of the workpiece to be measured are correct, the method further includes: S6: triggering the contact probe to generate a signal.

3. The contact type three-dimensional coordinate measuring machine measurement method according to claim 1, characterized in that: If the shape, size and position of the current detection path of the workpiece to be measured are incorrect, the method further includes S7: compensating for the temperature and contact probe wear errors of the workpiece to be measured.

4. A contact type three-dimensional coordinate measuring machine, characterized in that: Including contact type three-dimensional coordinate measuring system and contact type probe; The contact type three-coordinate measurement system comprises a main control module; the contact type probe is connected to the main control module; the main control module is also connected to a control module, a temperature detection module and an input module, which are used to coordinate the cooperation between the modules through the main control module; Control module: used for controlling the contact type three-dimensional coordinate measuring machine to detect the coordinate value of the shape to be measured of the preset detection path of the workpiece to be measured; Temperature detection module: used to obtain the current contact coordinate measuring machine temperature and detect the ambient temperature; The input module includes a first input module and a second input module, and a comparison and analysis unit is provided between the first input module and the second input module for obtaining the wear error of the contact probe; The first input module is used to input the shape and precision coordinate values ​​of the standard workpiece; The second input module is used to input the shape and precision coordinate value of the workpiece to be measured; The comparison and analysis unit includes a comparison module, an adjustment module, a calculation module and a judgment module connected in sequence; Comparison module: used to compare the shape and precision coordinate values ​​of the workpiece to be measured with the shape and precision coordinate values ​​of the standard workpiece; Adjustment module: used to make the boundary position of the shape of the workpiece to be measured and the shape of the standard workpiece evenly close; Calculation module: used to calculate the distance between any shape point of the workpiece to be measured and the corresponding shape point of the standard workpiece shape; The judgment module is used to store the distance threshold and judge the size between the distance and the distance threshold.

5. A contact type three-dimensional coordinate measuring machine according to claim 4, characterized in that: The comparison and analysis unit also includes an error compensation module, which is connected to the judgment module and the main control module and is used to compensate for the temperature and contact probe wear errors of the workpiece to be measured.

6. A contact type three-dimensional coordinate measuring machine according to claim 4, characterized in that: The contact type three-coordinate measuring system further comprises a probe trigger module, which is connected to the main control module and the contact type probe and is used to control the contact type probe to trigger and generate a signal.

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