Device for dynamic measurement of grinding heat and thermal deformation during grinding of internal thread of screw nut

Abstract

The application discloses a kind of dynamic measuring device for grinding heat and thermal deformation when screw nut internal thread forming grinding, including slip ring fixed tooling, three-jaw chuck, slip ring, extension tooling, nut connection tooling, ball screw pair nut, temperature sensor, laser interferometer and data acquisition system.The temperature sensor is matched with slip ring, the problem that temperature sensor data line is wound due to nut rotation during grinding processing can be avoided, and the grinding heat generated during internal thread forming grinding is dynamically detected.At the same time, the axial end face of the nut is monitored by using the laser interferometer, and the thermal deformation of the nut after grinding processing is detected.The slip ring fixed tooling is positioned and matched by the outer cylindrical surface of the spindle box, to ensure the coaxiality of the slip ring fixed tooling and the slip ring.The ball screw pair nut is connected with the extension tooling by the nut connection tooling, and different sizes of nut connection tooling can be replaced to detect different models of ball screw pair nut.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of grinding heat and thermal deformation measurement, and particularly relates to a device for dynamically measuring grinding heat and thermal deformation during profile grinding of an inner thread of a screw nut. BACKGROUND

[0002] As a precision transmission mechanism, a ball screw pair has the advantages of high transmission efficiency, high repeat positioning accuracy, stable and reliable work, long service life, etc., and is widely applied to various fields such as numerical control machining centers, precision instruments, aerospace, advanced weapon equipment, etc., and becomes a key functional component in a precision transmission system. The quality of the nut, as a key component of the ball screw pair, determines the performance of the ball screw pair.

[0003] During the machining of the inner raceway of the nut, profile grinding is the most commonly used machining method and is also the most critical step in the entire machining process of the nut, and the quality of the machining directly affects the final quality of the nut. The grinding heat generated during the profile grinding process will affect the grinding efficiency and grinding quality of the inner thread of the nut, and will seriously cause burn of the grinding surface. Thermal deformation will affect the machining accuracy of the inner thread of the nut and will cause a large error. Therefore, accurate detection of the grinding heat and thermal deformation generated during the grinding of the inner thread of the ball screw pair is very important for improving the grinding quality of the inner thread of the nut. SUMMARY

[0004] The application aims at the problems existing in the prior art, and provides a device for dynamically measuring grinding heat and thermal deformation during profile grinding of an inner thread of a screw nut.

[0005] The technical solution for achieving the object of the present application is: a device for dynamically measuring grinding heat and thermal deformation during forming grinding of the inner thread of a ball screw nut, comprising a spindle box, a slip ring fixing tool, a three-jaw chuck, a slip ring, a ball screw nut, a laser interferometer, a temperature sensor, a nut connecting tool, an extension tool, a bed, and a data acquisition system; the spindle box is installed on the bed, and the three-jaw chuck and the slip ring fixing tool are installed on the surface of the spindle box perpendicular to the axis of the spindle box, wherein the three-jaw chuck is coaxial with the axis of the spindle box, and the slip ring fixing tool is installed on the periphery of the three-jaw chuck; the extension tool is arranged along the axis of the spindle box, one end of the extension tool is clamped by the three-jaw chuck, the other end of the extension tool penetrates the slip ring and connects the ball screw nut through the nut connecting tool, and the other end of the extension tool is connected with the rotor part of the slip ring; the temperature sensor is installed on the ball screw nut, the data line of the temperature sensor is connected with the rotor part of the slip ring, and the temperature sensor is connected with the data acquisition system through the slip ring; the temperature sensor is used to convert the temperature change generated during grinding into a voltage signal change, and transmit the voltage signal to the data acquisition system through the cable of the slip ring; the laser interferometer is installed in the axial direction of the ball screw nut, and is used to record the axial position of the nut and transmit the axial position to the data acquisition system.

[0006] Further, a boss is arranged on the surface of the spindle box perpendicular to the axis of the spindle box, and the slip ring fixing tool is limited by the boss during installation, so as to ensure the coaxiality of the slip ring and the slip ring fixing tool with the spindle box when they are connected.

[0007] Further, the number of temperature sensors is multiple, and the temperature sensors are divided into multiple groups, and each group of temperature sensors is uniformly distributed along the circumferential direction of the ball screw nut.

[0008] Further, a group of temperature sensors is arranged on each raceway of the inner thread of the ball screw nut.

[0009] Further, the temperature sensor is installed in the mounting hole arranged on the inner thread of the ball screw nut.

[0010] Further, the size of the nut connecting tool is adjustable, so as to adapt to ball screw nuts of different models and sizes.

[0011] Further, the slip ring fixing tool comprises a first fixing tool and a second fixing tool, and the first fixing tool and the second fixing tool are symmetrically distributed on both sides of the three-jaw chuck.

[0012] Further, the cable of the slip ring passes through the opening in the slip ring fixing tool and is connected with the data acquisition system after the cable passes out of the slip ring fixing tool.

[0013] Further, the nut connecting tool is connected with the extension tool and the ball screw nut through bolts, respectively.

[0014] Further, the slip ring fixing tool is fixedly connected with the spindle box through bolts.

[0015] Compared with the prior art, the present application has the following advantages:

[0016] 1) By matching the temperature sensor with the slip ring, the problem of data transmission line winding of the temperature sensor caused by the rotation of the nut during the grinding process is effectively solved.

[0017] 2) The extension tool and the ball screw nut are connected through the nut connecting tool, and different nut connecting tools can be replaced to adapt to different types of ball screw nuts, thereby reducing the cost of detecting different types of nuts.

[0018] 3) The ball screw nut is punched on the inner thread, and the temperature sensor is placed in the circumferential direction along the raceway, and multiple temperature sensors are placed in each circle, so that the overall heating condition of the nut during the grinding process can be accurately detected, and a complete temperature field model can be established.

[0019] The present application will be further described in detail below with reference to the accompanying drawings. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 It is a schematic diagram of the overall structure of the grinding heat and thermal deformation dynamic measurement device for the inner thread forming grinding of the ball screw nut in an embodiment.

[0021] Figure 2 It is a schematic diagram of the installation of the ball screw nut and the nut connecting tool in an embodiment.

[0022] Figure 3 It is a schematic diagram of the installation and distribution of the temperature sensor in an embodiment.

[0023] Figure 4 It is a schematic diagram of the connection of the extension tool, the nut connecting tool and the slip ring in an embodiment.

[0024] Figure 5 It is a schematic diagram of the connection and wiring of the slip ring, the spindle box and the slip ring fixing tool in an embodiment. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical scheme and advantages of the present application clearer, the present application will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application, and are not used to limit the present application.

[0026] It should be noted that if the embodiments of the present application involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative positional relationship, movement condition, etc. between components in a certain specific posture (as shown in the drawings), and if the specific posture changes, the directional indications will also change accordingly.

[0027] In addition, if the embodiments of the present application involve descriptions such as "first", "second", etc., the descriptions of "first", "second", etc. are only for description purposes and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first", "second" can explicitly or implicitly include at least one of the features. In addition, the technical solutions of each embodiment can be combined with each other, but it must be based on the fact that a person skilled in the art can realize it, and when the combination of technical solutions contradicts each other or cannot be realized, it should be considered that the combination of technical solutions does not exist and is not within the protection scope required by the present application.

[0028] In one embodiment, in combination Figure 1 , a device for dynamically measuring grinding heat and thermal deformation during grinding of inner thread of ball screw nut is provided, the device comprises a spindle box 1, a slip ring fixing tool 2, a three-jaw chuck 3, a slip ring 4, a ball screw nut 5, a laser interferometer 6, a temperature sensor 7, a nut connecting tool 8, an extension tool 9, a bed 10, and a data acquisition system 11; the spindle box 1 is installed on the bed 10, the three-jaw chuck 3 and the slip ring fixing tool 2 are installed on the surface of the spindle box 1 perpendicular to the axis of the spindle box 1, wherein the three-jaw chuck 3 is coaxial with the axis of the spindle box 1, and the slip ring fixing tool 2 is installed on the periphery of the three-jaw chuck 3; the extension tool 9 is arranged along the axis of the spindle box 1, one end of the extension tool 9 is clamped by the three-jaw chuck 3, the other end of the extension tool 9 penetrates the slip ring 4 and connects the ball screw nut 5 through the nut connecting tool 8, and the other end of the extension tool 9 is connected with the rotor part of the slip ring 4; the temperature sensor 7 is installed on the ball screw nut 5, the data line of the temperature sensor 7 is connected with the rotor part of the slip ring 4, and the temperature sensor 7 is connected with the data acquisition system 11 through the slip ring 4; the temperature sensor 7 is used to convert the temperature change generated during grinding into voltage signal change, and transmit the voltage signal to the data acquisition system 11 through the cable of the slip ring 4; the laser interferometer 6 is installed in the axial direction of the ball screw nut 5, and is used to record the axial position of the nut and transmit the axial position to the data acquisition system 11.

[0029] Here, preferably, the slip ring fixing tool 2 is fixed on the spindle box 1 by bolts 2-3.

[0030] Here, preferably, the other end of the extension tool 9 is fixed with the slip ring 4 by locking bolts 4-1.

[0031] Here preferably, in combination Figure 2 And Figure 4 The nut connecting tool 8 is connected with the extension tool 9 and the ball screw nut 5 through the bolts 8-1 and 5-1 respectively.

[0032] Further, in one of the embodiments, a boss 1-1 is arranged on the surface of the spindle box 1 perpendicular to the axis thereof, and the slip ring fixing tool 2 is limited by the boss 1-1 when installed, so as to ensure the coaxiality of the slip ring 4 and the spindle box 1 when the slip ring 4 is connected with the slip ring fixing tool 2.

[0033] Further, in one of the embodiments, the temperature sensors 7 are multiple in number and are divided into multiple groups, and each group of temperature sensors 7 is evenly distributed along the circumferential direction of the ball screw nut 5.

[0034] Further preferably, one group of temperature sensors 7 is arranged on each raceway of the internal thread of the ball screw nut 5.

[0035] Further preferably, in combination Figure 3 The temperature sensors 7 are arranged in the mounting holes 5-2 arranged on the internal thread of the ball screw nut 5.

[0036] Here preferably, three temperature sensors 7 are arranged on each raceway along the circumferential direction, and if the number of the internal thread is N, the number of the temperature sensors 7 arranged is 3N.

[0037] Further, in one of the embodiments, the size of the nut connecting tool 8 is adjustable, so as to adapt to ball screw nuts 5 of different models and sizes.

[0038] Further, in one of the embodiments, in combination Figure 5 The slip ring fixing tool 2 is of a split structure and comprises a first fixing tool 2-1 and a second fixing tool 2-2, which are symmetrically distributed on the two sides of the three-jaw chuck 3. The slip ring 4 is fixedly installed on the first fixing tool 2-1 and the second fixing tool 2-2.

[0039] Further, in one of the embodiments, the cable 4-2 of the slip ring 4 is connected with the data acquisition system 11 after passing through the opening 2-4 of the slip ring fixing tool 2.

[0040] The working principle of the application is as follows:

[0041] In the process of grinding the internal thread in the grinding wheel, firstly, the laser interferometer 6 is started, the axial position of the nut before starting the machining is recorded and transmitted to the data acquisition system 11, then the spindle box 1 is rotated, the extension tooling 9, the rotor part of the slip ring 4, the nut connecting tooling 8 and the ball screw pair 5 are driven to rotate by the three-jaw chuck 3. In the process of grinding, the temperature sensor 7 converts the change of the temperature generated in the process of grinding into the change of the voltage signal, and transmits the voltage signal to the data acquisition system 11 through the slip ring 4, after processing, the change of the grinding heat in the process of grinding is obtained. After completing a grinding process, the axial position of the nut at this time is recorded again by the laser interferometer 6, and is transmitted to the data acquisition system 11, the change of the position before and after is compared, and the axial thermal deformation of the nut before and after grinding is obtained.

[0042] The basic principles, main features and advantages of the present application are shown and described above. It should be understood by those skilled in the art that the present application is not limited by the above examples, and the above examples and descriptions in the specification are only to illustrate the principles of the present application. Any modification, equivalent replacement, improvement, etc. within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. A device for dynamically measuring grinding heat and thermal deformation during thread forming grinding of a ball screw nut inner thread, characterized by, The device comprises a spindle box (1), a slip ring fixing tool (2), a three-jaw chuck (3), a slip ring (4), a ball screw nut (5), a laser interferometer (6), a temperature sensor (7), a nut connecting tool (8), an extension tool (9), a bed (10), and a data acquisition system (11); the spindle box (1) is installed on the bed (10), and the three-jaw chuck (3) and the slip ring fixing tool (2) are installed on the surface of the spindle box (1) perpendicular to the axis of the spindle box (1); the three-jaw chuck (3) is coaxial with the axis of the spindle box (1), and the slip ring fixing tool (2) is installed on the periphery of the three-jaw chuck (3); the extension tool (9) is arranged along the axis of the spindle box (1), one end of the extension tool (9) is clamped by the three-jaw chuck (3), the other end of the extension tool (9) penetrates through the slip ring (4) and connects the ball screw nut (5) through the nut connecting tool (8), and the other end of the extension tool (9) is connected with the rotor part of the slip ring (4); the temperature sensor (7) is installed on the ball screw nut (5), the data line of the temperature sensor (7) is connected with the rotor part of the slip ring (4), and the temperature sensor (7) is connected with the data acquisition system (11) through the slip ring (4); the temperature sensor (7) is used for converting the temperature change generated during grinding into a voltage signal change, and transmitting the voltage signal to the data acquisition system (11) through the cable of the slip ring (4); the laser interferometer (6) is installed in the axial direction of the ball screw nut (5) and is used for recording the axial position of the nut and transmitting the axial position to the data acquisition system (11); a group of temperature sensors (7) are arranged on each track of the internal thread of the ball screw nut (5); the size of the nut connecting tool (8) is adjustable, and the nut connecting tool (8) is used for adapting to ball screw nuts (5) of different models and sizes.

2. The dynamic measurement device for grinding heat and thermal deformation in the thread forming grinding of the ball screw nut inner thread according to claim 1, characterized in that, A boss is arranged on the surface of the spindle box (1) perpendicular to the axis of the spindle box (1), and the slip ring fixing tool (2) is limited by the boss during installation, so as to ensure the coaxiality of the slip ring (4) and the slip ring fixing tool (2) when the slip ring (4) is connected with the slip ring fixing tool (2).

3. The dynamic measurement device for grinding heat and thermal deformation in the thread forming grinding of the ball screw nut inner thread according to claim 1, characterized in that, The number of the temperature sensors (7) is multiple, and the temperature sensors (7) are divided into multiple groups; each group of temperature sensors (7) is uniformly distributed along the circumferential direction of the ball screw nut (5).

4. The dynamic measurement device for grinding heat and thermal deformation in the thread forming grinding of the ball screw nut inner thread according to claim 3, characterized in that, The temperature sensors (7) are installed in the mounting holes arranged on the internal thread of the ball screw nut (5).

5. The dynamic measurement device for grinding heat and thermal deformation in the thread forming grinding of the ball screw nut inner thread according to claim 1, characterized in that, The slip ring fixing tool (2) comprises a first fixing tool and a second fixing tool, and the first fixing tool and the second fixing tool are symmetrically distributed on both sides of the three-jaw chuck (3).

6. The dynamic measurement device for grinding heat and thermal deformation in the thread forming grinding of the ball screw nut inner thread according to claim 1, characterized in that, The cable of the slip ring (4) is connected with the data acquisition system (11) after penetrating out of the slip ring fixing tool (2) through the opening of the slip ring fixing tool (2).

7. The dynamic measurement device for grinding heat and thermal deformation in the thread forming grinding of the ball screw nut inner thread according to claim 1, characterized in that, The nut connecting tool (8) is connected with the extension tool (9) and the ball screw nut (5) through bolts, respectively.

8. The dynamic measurement device for grinding heat and thermal deformation in the thread forming grinding of the ball screw nut inner thread according to claim 1, characterized in that, The slip ring fixing tool (2) is fixedly connected with the spindle box (1) through bolts.

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