Tool for detecting thermal offset of electric spindle of machine tool

Abstract

The utility model relates to a tool for detecting thermal offset of a machine tool electric spindle, and belongs to the technical field of machine tool spindle detection tools. The device structurally comprises a fixed cutter, an adjustable bracket and a clamping frame, wherein the fixed cutter square is positioned on a cutter rest of a machine tool, and the clamping frame is connected with the end part of the fixed cutter square through the adjustable bracket; a sensor is arranged in the center of the clamping frame, and the sensing face of the sensor is located on the top face of the clamping frame. Arc-shaped limiting frames are arranged on the two sides of the top face of the clamping frame respectively, and when the arc-shaped limiting frames are in a working state, one ends of the arc-shaped limiting frames are inserted into the side end faces of the clamping frame, and the other ends of the arc-shaped limiting frames make contact with the end face of the machine tool spindle detection rod. When facing spindles with different turning radiuses, the tool can accurately and quickly position and control the sensor joint to reach the distance required by the test, is convenient to use and fix, and can realize accurate detection.

Description

TECHNICAL FIELD

[0001] The utility model relates to a kind of tool of machine tool electric spindle thermal deviation detection, belong to the technical field of machine tool spindle detection tooling. BACKGROUND

[0002] In the process of machine tool assembly completion and relevant experimental project test detection, machine tool electric spindle thermal deviation, thermal elongation and spindle end face runout are several major detection projects before project completion.Currently, the project is detected by the way that displacement sensor joint is connected with the surface of spindle test material axial / radial at a certain distance, and the specified distance is half (micron level) according to instrument range (millimeter level), so there is difficulty in detection mechanism installation and precision alignment in the testing process, and there is a need for repeated adjustment in the face of different rotary radius detection rods, the positioning distance point is slow, and the fixing mode is complex, which does not match the reasonable progress of the detection process, and there is certain limitation. UTILITY MODEL CONTENTS

[0003] The technical problem to be solved by the utility model is to provide a kind of tool of machine tool electric spindle thermal deviation detection, which can accurately and quickly position and control the distance of sensor joint to meet the testing requirements when facing different rotary radius spindles, is convenient to use and fixed, and can realize accurate detection.

[0004] To solve the above problems, the specific technical scheme of the utility model is as follows: a kind of tool of machine tool electric spindle thermal deviation detection, including fixed knife side, adjustable support and clamping frame;Wherein fixed knife side is positioned on the tool rest of machine tool, and clamping frame is connected with the end of fixed knife side through adjustable support;The center of clamping frame is provided with sensor, and the sensing surface of sensor is located on the top surface of clamping frame;Two sides of the top surface of clamping frame are respectively provided with arc-shaped limit frame, and when the arc-shaped limit frame is in working state, one end is inserted into the arc-shaped groove in the side end surface of clamping frame, and the other end is in contact with the end surface of machine tool spindle detection rod.

[0005] The two ends of arc-shaped limit frame are respectively provided with limit platform;End cover is respectively arranged on the two sides of clamping frame;The limit platform on the inner side of arc-shaped limit frame is rotationally limited on end cover;The limit platform on the outer side is supported on the end surface of machine tool spindle detection rod.

[0006] Cam locking rod is connected between the fixed knife side and the adjustable support;The structure of cam locking rod includes hollow rod body, pressing rod and cam;One end of rod body is fixedly connected with fixed knife side, and annular groove is arranged on the other end of rod body close to end portion, position corresponding opening slot is arranged on the plane symmetrically milled on annular groove, double-ear piece is arranged at opening slot, double-ear piece is connected with cam through pin, and pressing rod is fixedly connected with one end of cam;The circumferential surface of cam is tightly matched with the circumferential surface of adjustable support end portion inserted in rod body.

[0007] The inner circumferential surface of the rod is provided with an L-shaped slot, one side of the L-shaped slot extends along the axial direction of the inner circumferential surface, and the other side of the L-shaped slot is an arc-shaped slot, and the starting end face of the arc-shaped slot is at an angle of 90°; a boss is arranged on the end circumferential surface of the adjustable support, the boss is inserted into the L-shaped slot, and the adjustable support and the rod are rotated at a relative angle of 90°.

[0008] Four insertion slots are distributed in a cross shape on the outer circumferential surface of the end portion of the adjustable support; the cam is provided with two thickness regions, when the cam is in a non-pressing state, the small-thickness part of the cam is inserted into and slidingly matched with the insertion slot; when the cam is in a pressing state, the large-thickness part of the cam is tightly matched with the outer circumferential surface of the adjustable support.

[0009] A curved surface ring groove is arranged on the outer circumferential surface of the end portion of the adjustable support and located at the pressing working position of the cam, and the cam is tightly pressed in combination with the bottom surface and the arc surface of the curved surface ring groove.

[0010] One end of the clamping frame is provided with a clamping gap, the inner end portion of the clamping gap is in communication with the central through hole, and a fastening bolt is arranged on the clamping frame in a direction perpendicular to the clamping gap; the sensor is inserted into the central through hole and clamped by adjusting the deformation amount of the clamping gap through the fastening bolt.

[0011] The tool structure for detecting thermal deviation of the electric spindle of the machine tool is simple in structure, low in cost, flexible in installation, stable in movement and flexible in coping with various spindle rotation radius detection, can shorten the spindle test time, and thus reduces the machine tool test cost. BRIEF DESCRIPTION OF DRAWINGS

[0012] Figure 1 It is a perspective view of the present application.

[0013] Figure 2 It is an outline view of the clamping frame.

[0014] Figure 3 It is a non-working state view of the circular arc-shaped limiting frame on the clamping frame.

[0015] Figure 4 It is a working state view of the circular arc-shaped limiting frame on the clamping frame.

[0016] Figure 5 It is a schematic view of the end structure of the adjustable support.

[0017] Figure 6 It is an outline view of the cam locking rod.

[0018] Figure 7 It is Figure 6 A-A sectional view.

[0019] Figure 8 It is a schematic view of the integrated structure of the pressing rod and the cam.

[0020] Figure 9 It is a matching schematic view of the extrusion contact surface of the cam and the curved surface ring groove. DETAILED DESCRIPTION

[0021] As shown in Figure 1 and Figure 2 , a tool for detecting thermal deviation of a machine tool electric spindle, comprising a fixed tool side 1, an adjustable support 3 and a clamping frame 6; wherein the fixed tool side 1 is positioned on the tool holder of the machine tool, and the clamping frame 6 is connected with the end of the fixed tool side 1 through the adjustable support 3; the center of the clamping frame 6 is provided with a sensor 7, and the sensing surface of the sensor 7 is located on the top surface of the clamping frame 6; on both sides of the top surface of the clamping frame 6, arc-shaped limit frames 8 are respectively arranged; in the working state of the arc-shaped limit frame 8, one end is inserted into the arc-shaped groove on the side end surface of the clamping frame 6, and the other end is in contact with the end surface of the machine tool spindle detection rod.

[0022] As shown in Figure 3 and Figure 4 , the two ends of the arc-shaped limit frame 8 are respectively provided with limit platforms 8-1; end covers 6-1 are respectively arranged on both sides of the clamping frame 6; the limit platform 8-1 on the inner side of the arc-shaped limit frame 8 is rotationally limited on the end cover 6-1; the limit platform 8-1 on the outer side is supported on the end surface of the machine tool spindle detection rod. Adjust the position of the machine tool spindle detection rod so that its top end contacts the end of the arc-shaped limiter; when the required distance between the capacitive displacement sensor and the spindle detection rod is reached, rotate the machine tool electric spindle; the change value of the capacitive displacement sensor is the radial / axial runout value of the spindle; subsequent error spectrum analysis is performed on the collected data to obtain the error at different frequencies.

[0023] As shown in Figure 6 , a cam locking rod 2 is connected between the fixed tool side 1 and the adjustable support 3; the structure of the cam locking rod 2 includes a hollow rod body 2-1, a pressing rod 2-2 and a cam 2-3; one end of the rod body 2-1 is fixedly connected with the fixed tool side 1, and an annular groove is arranged on the other end of the rod body 2-1 near the end; a position corresponding opening slot is arranged on the symmetrically milled planes of the annular groove; a double lug 2-5 is arranged at the opening slot; the double lug 2-5 is connected with the cam 2-3 through a pin; one end of the cam 2-3 is fixedly connected with the pressing rod 2-2; the circumferential surface of the cam 2-3 is in pressing fit with the end circumferential surface of the adjustable support 3 inserted into the rod body 2-1.

[0024] As shown in Figure 5 and Figure 6 , an L-shaped groove 2-4 is arranged on the inner circumferential surface of the rod body 2-1; one side of the L-shaped groove 2-4 extends along the axial direction of the inner circumferential surface; the other side of the L-shaped groove 2-4 is an arc-shaped groove, and the starting end face of the arc-shaped groove has an angle of 90°; a boss 3-1 is arranged on the end circumferential surface of the adjustable support 3; the boss 3-1 is inserted into the L-shaped groove 2-4; the adjustable support 3 and the rod body 2-1 are relatively rotated at an angle of 90°. Figure 7 As shown in Figure 8As shown, the cam 2-3 is provided with two thickness zones, when the cam 2-3 is in the non-pressing state, the small thickness part of the cam 2-3 is inserted into the slot 3-2 and is in sliding fit; on the outer circumference of the end of the adjustable support 3, and at the pressing working position of the cam 2-3, a curved surface ring groove 3-3 is arranged, when the cam 2-3 is in the pressing state, the large thickness part of the cam 2-3 is combined and pressed with the bottom surface and the curved surface of the curved surface ring groove 3-3, as shown in Figure 9 .

[0025] When the end of the adjustable support 3 is inserted into the groove of the cam locking rod 2, when the boss 3-1 on the adjustable support 3 is slid into the arc-shaped groove along the radial groove of the L-shaped groove 2-4, and at the same time, the two slots 3-2 pass through the small thickness area of the cam 2-3, the curved surface ring groove 3-3 is in position corresponding to the cam 2-3; rotate the rod body 2-1, the large thickness area of the cam 2-3 is extruded with the profile of the curved surface ring groove 3-3, so as to lock the adjustable support 3 in the cam locking rod 2, when the sensor needs to rotate 90° to work, it is not necessary to pull out the adjustable support 3, only need to reverse the rotation of the pressing rod 2-2 in the non-working state, so that the boss 3-1 is rotated to the other limit position in the L-shaped groove 2-4, at the same time, the cam 2-3 is in the curved surface ring groove, and the adjustable support 3 does not interfere with each other, and then the pressing rod 2-2 is locked again.

[0026] As shown in Figure 2 , one end of the clamping frame 6 is provided with a clamping gap 6-2, the inner end of the clamping gap 6-2 is in communication with the center through hole, and the clamping frame 6 is provided with a fastening bolt 4 in the direction perpendicular to the clamping gap 6-2; the sensor 7 is inserted into the center through hole, and the deformation amount of the clamping gap 6-2 is adjusted by the fastening bolt 4 to clamp the sensor 7. When the height of the circular arc limiting frame 8 is different, the sensing end surface of the sensor 7 can be adjusted and measured.

Claims

1. A fixture for detecting thermal offset of a machine tool electric spindle, characterized in that: It includes a fixed tool holder (1), an adjustable bracket (3), and a clamping frame (6); wherein the fixed tool holder (1) is positioned on the tool post of the machine tool, and the clamping frame (6) is connected to the end of the fixed tool holder (1) through the adjustable bracket (3); a sensor (7) is provided at the center of the clamping frame (6), and the sensing surface of the sensor (7) is located on the top surface of the clamping frame (6); arc-shaped limit frames (8) are provided on both sides of the top surface of the clamping frame (6), and when the arc-shaped limit frame (8) is in working state, one end is inserted into the arc groove on the side end face of the clamping frame (6), and the other end is in contact with the end face of the machine tool spindle inspection bar.

2. The fixture for detecting thermal offset of machine tool electric spindle according to claim 1, characterized in that: The arc-shaped limiting frame (8) has limiting platforms (8-1) at both ends; end caps (6-1) are provided on both sides of the clamping frame (6); the limiting platform (8-1) on the inner side of the arc-shaped limiting frame (8) is rotated and limited on the end cap (6-1); the limiting platform (8-1) on the outer side is supported on the end face of the machine tool spindle inspection bar.

3. The fixture for detecting thermal offset of machine tool electric spindles according to claim 1, characterized in that: The fixed blade (1) and the adjustable bracket (3) are connected by a cam locking rod (2); the structure of the cam locking rod (2) includes a hollow rod body (2-1), a pressure rod (2-2), and a cam (2-3); one end of the rod body (2-1) is fixedly connected to the fixed blade (1), and an annular groove is provided at the other end of the rod body (2-1) near the end. A corresponding opening groove is provided on the plane of the symmetrically milled annular groove. A double ear piece (2-5) is provided at the opening groove. The double ear piece (2-5) is connected to the cam (2-3) by a pin. One end of the cam (2-3) is fixedly connected to the pressure rod (2-2); the circumferential surface of the cam (2-3) is pressed and fitted with the circumferential surface of the end of the adjustable bracket (3) inserted in the rod body (2-1).

4. The fixture for detecting thermal offset of machine tool electric spindles according to claim 3, characterized in that: The inner circumferential surface of the rod (2-1) is provided with an L-shaped groove (2-4). One side of the L-shaped groove (2-4) extends along the axial direction of the inner circumferential surface, and the other side of the L-shaped groove (2-4) is an arc groove, and the included angle of the starting end face of the arc groove is 90°. The end circumferential surface of the adjustable bracket (3) is provided with a boss (3-1), and the boss (3-1) is inserted into the L-shaped groove (2-4). The adjustable bracket (3) and the rod (2-1) rotate relative to each other at a 90° angle.

5. The fixture for detecting thermal offset of machine tool electric spindles according to claim 4, characterized in that: The adjustable bracket (3) has four slots (3-2) distributed in a cross shape on the outer circumference of its end; the cam (2-3) has two thickness areas. When the cam (2-3) is in a non-pressed state, the smaller thickness part of the cam (2-3) is inserted into and slides into the slot (3-2); when the cam (2-3) is in a pressed state, the larger thickness part of the cam (2-3) is pressed into the outer circumference of the adjustable bracket (3).

6. The fixture for detecting thermal offset of machine tool electric spindle according to claim 5, characterized in that: A curved annular groove (3-3) is provided on the outer circumference of the end of the adjustable bracket (3) and at the pressing position of the cam (2-3). The cam (2-3) is pressed together with the bottom surface and the arc surface of the curved annular groove (3-3).

7. The fixture for detecting thermal offset of machine tool electric spindles according to claim 1, characterized in that: The clamping frame (6) has a slit (6-2) at one end, and the inner end of the slit (6-2) is connected to the central through hole. A fastening bolt (4) is provided on the clamping frame (6) in a direction perpendicular to the slit (6-2). The sensor (7) is inserted into the central through hole, and the deformation of the slit (6-2) is adjusted by the fastening bolt (4) to clamp the sensor (7).

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