JPH0610270Y2 - 2 component force measurement device - Google Patents

Description

[Detailed Description of the Invention] (Industrial field of application) The present invention relates to a micro-cutting force applied to a workpiece by a micro drill or the like when drilling a resin or metal material with the micro drill or the like. The present invention relates to a two-component force measuring device for separately detecting the axial thrust (thrust) and the rotational force (torque) in two directions.

(Prior Art) As shown in FIG. 3, a conventional two-component force measuring device uses a disk whose outer periphery is fixed to a casing C for a thrust converter T ₁ at the bottom, and a rotary tool W. The resistance strain gauge G ₁ detects the elastic strain caused by the thrust received from the torque converter, and the cantilever B fixed to the central axis S is used for the torque converter T ₂ , and the free end of the cantilever B is implanted in the retainer R. It was restrained by the pin P, and the elastic strain generated by the torque received from the tool W was detected by the strain gauge G ₂ similar to the above.

(Problems to be Solved by the Invention) In the above-mentioned conventional case, since the thrust transducer T ₁ is a disc and the torque transducer T ₂ is a cantilever B, the measurement accuracy is low. There was a problem. SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned conventional drawbacks, and an object of the present invention is to provide a two-component force measuring device capable of detecting both thrust and torque with high accuracy.

(Means for Solving the Problems) In order to achieve the above object, the present invention provides a receiving portion that is symmetric with respect to the axis of the main shaft and protrudes at both ends along the axial direction, and along the diametrical direction of the main shaft. An arm having a tip portion extending at both tips, a main support portion that rotatably supports the arm and the main shaft, a thrust detection plate that is bridged and fixed between the receiving portions, and fixed to the thrust detection plate. Torque detection having a thrust detection part having a work piece support part which is guided so as to be displaceable only in the axial direction of the main shaft, and a torque detection plate which is provided at a predetermined position so as to correspond to both ends of the arm. And a strain gauge is attached to the thrust detection plate and the torque detection plate.

(Operation) In the two-component force measuring apparatus according to the present invention, the thrust detecting portion is fixed to the thrust detecting plate which is fixedly provided between the receiving portions protruding at both ends in the axial direction of the arm which is symmetrical with respect to the axis of the main shaft. A work piece support portion fixed to the thrust detection plate and guided so as to be displaceable only in the axial direction of the main shaft,
Due to the thrust received by the workpiece support part, the elastic strain generated in the thrust detection plate to which the strain gauge is attached is detected by the strain gauge and the thrust is measured with high accuracy. The main shaft has a torque detection plate that is installed in a pair of ends corresponding to the distal ends of the arm extending along the diametrical direction of the main shaft, and is rotatably supported together with the main shaft. The torque detection plate is pressed by the tip of the arm, the elastic strain generated in the torque detection plate is detected by the strain gauge attached thereto, and the torque is measured with high accuracy.

(Embodiment) An embodiment of the present invention will be described with reference to the drawings by taking as an example the case where a microdrill is used for drilling.
FIG. 1 is a front sectional view showing a main part of a two-component force measuring device according to the present invention, and FIG. 2 is a perspective view of the same.

The two-component force measuring device is, as a whole, point-symmetric with respect to the axis of the vertical axis 1 as the main axis on the plan view, and the thrust of the thrust detecting section 5 is provided between the receiving sections 2a protruding upward at both ends of the arm 2. A detection plate 6 is bridged and fixed to the thrust detection plate 6, and a workpiece support portion 7 guided so as to be displaceable only in the axial direction of the vertical axis 1 is fixed to the thrust detection plate 6, and the shaft support portion 4 of the main support portion 3 is used. The arm 2 and the vertical axis 1 are rotatably supported via a radial bearing 10, and torque detecting portions 8 are provided at both ends of the main supporting portion 3, and the torque detecting portions 8 correspond to both end portions of the arm 2. A torque detection plate 9 is provided in a predetermined position across from and oppositely. Then, the two-component force dynamometer measures the strains applied to the thrust detection plate 6 and the torque detection plate 9 respectively when the work piece is placed on the work piece support portion 7 and is drilled by a micro drill. The gauges 11 and 12 can independently detect the thrust and the torque with high accuracy.

The vertical axis 1 has an upper flange 1a and a lower flange 1b at a predetermined interval in the upper and lower sides, and a round hole 1c is formed between the upper end and the middle of the lower flange. A miniature stroke bearing 13 is fitted.
Further, the vertical axis 1 has a male screw 1d engraved on the outer periphery of the upper portion, has a screw hole (not shown) at the lower end, and has a male screw 1d at the upper end.
It is integrated with the arm 2 and the inner ring 10a of the radial bearing 10 by being fastened with a nut 14 that is screwed into the screw and a bolt 15 that is screwed into the screw hole at the lower end.

The arm 2 has a receiving portion 2a protruding upward at both ends along the axial direction of the vertical axis 1 and a distal end portion 2b extending at both distal ends along the diametrical direction of the vertical axis 1 and provided at the center. The upper part of the vertical axis 1 is inserted into the through hole 2c, the lower surface abuts on the upper surface of the upper flange 1a of the vertical axis 1, and is fastened by the nut 14 screwed to the male screw 1d of the vertical axis 1. It is rotatably supported by the main support portion 3 integrally with the inner ring 10 a of the bearing 10.

The main support portion 3 includes a square hexahedral shaft support portion 4 and a torque detection portion 8 that extends in the vertical direction at both ends of the shaft support portion 4 and projects upward.

The shaft support portion 4 has a through hole 4a at the center thereof.
A flange-shaped step portion 4b is formed in the middle of a, and two radial bearings 10 are fitted above and below the step portion 4b.

The thrust detection unit 5 has a thrust detection plate 6 attached to the arm 2 and a workpiece support unit 7 attached to the thrust detection plate 6.

The thrust detection plate 6 is a strip-shaped member made of phosphor bronze having a high Young's modulus, and is made as thick as possible within the range not hindering the measurement so as to have rigidity against torsion, and has a through hole in the center. 6 a, which is hung on the upper end of the receiving portion 2 a of the arm 2 and fixed by small bolts 17, and strain gauges 11 are attached to both upper and lower sides of the workpiece supporting portion 7.

The workpiece support portion 7 has a disc shape, and has a guide rod 7a that protrudes downward at the center of the lower surface and penetrates the through hole 6a of the thrust detection plate 6, and this guide rod 7a is inside the round hole 1c on the vertical axis. It is fitted to the inner circumference of the miniature stroke bearing 13 and is guided so as to be displaceable only in the axial direction of the vertical axis 1, and the bolt 16
It is fixed to the thrust detection plate 6 by.

The torque detecting portion 8 has receiving portions 8a protruding laterally at both upper and lower ends, and a torque detecting plate 9 is bridged between the receiving portions 8a and fixed by small bolts 18.

The torque detecting plate 9 is made of the same material as the thrust detecting plate 6 and has the same shape. The center corresponds to the position of the tip 2b of the arm 2 and the vertical position of the tip 2b of the arm 2. Strain gauge 1 similar to the thrust detection plate 6 on both sides
2 is attached.

Next, the operation of the two-component force measuring device having the above-described structure of the present invention will be described.

When the work piece 19 is fixed on the work piece supporting portion 7 and drilling is performed by the micro drill 20, thrust of the micro drill 20 in the axial direction of the vertical axis 1, that is, thrust of the work piece 19 is performed. In response to the action, the thrust detection plate 6
Bends downward, the workpiece support 7 is guided by the miniature stroke bearing 13 and the guide rod 7a, and is displaced only in the axial direction of the vertical axis 1, and the strain gauge 11 detects the elastic strain corresponding to the deflection. Thrust can be detected. At the same time, the micro drill 20 to the workpiece 19,
By receiving a torque via the workpiece support 7 and the thrust detection plate 6, the arm 2 is smoothly and angularly displaced about the vertical axis 1, and the tip 2b presses the torque detection plate 9, thereby The torque detecting plate 9 bends in the lateral direction, and elastic strain corresponding to this bending can be detected by the strain gauge 12 to detect the torque.

According to the above-described embodiment of the present invention, since the strip-shaped thrust detecting plate 6 is used for the thrust detecting portion 5, the thrust detecting plate 6 has sufficient rigidity in the twisting direction and supports the work piece. Since the portion 7 is guided by the miniature stroke bearing 13 via the guide rod 7a so as to be displaceable only in the axial direction of the main shaft 1, it is possible to perform measurement with high accuracy even when forming a curved hole in the workpiece 19. Since the radial bearing 10 is used for the shaft support portion 4, the workpiece 19
The small torque that acts on the torque detector 8 is transmitted to the torque detector 8 without loss, and the accuracy of torque measurement can be improved.

The present invention is not limited to the micro drill, and can be applied to various machining using other tools.

(Effects of the Invention) The present invention is configured as described above and has an arm that is symmetrical with respect to the axis of the main shaft and that has receiving portions that project at both ends along the axial direction, and a thrust that is fixed between the two receiving portions. A thrust plate having a workpiece support part fixed to the detection plate and the thrust detection plate and movably guided only in the axial direction of the main shaft, and by attaching a strain gauge to the thrust detection plate, Elastic strain of the thrust detection plate caused by the thrust received from the microdrill, the thrust can be measured with high precision by the strain gauge, the main support portion that rotatably supports the arm and the main shaft, A torque having a torque detection plate that is installed in a pair at a predetermined position in correspondence with both end portions of the arm extending along the diametrical direction of the main shaft. A strain gauge is attached to the torque detection plate, and the elastic strain of the torque detection plate caused by the torque can be detected by the strain gauge, and the torque can be measured with high accuracy. It is possible to provide a force-power measurement device.

[Brief description of drawings]

FIG. 1 is a front sectional view showing an essential part of a two-component force measuring device according to the present invention, FIG. 2 is a perspective view of the same as above, and FIG. 3 is a longitudinal section showing an essential part of a conventional two-component force measuring device. It is a figure. 1: vertical axis, 1a: upper flange, 1b: lower flange,
1c: Round hole, 1d: Male screw, 2: Arm, 2a: Receiving part, 2b: Tip part, 2c: Through hole, 3: Main support part, 4:
Shaft support portion, 4a: through hole, 4b: step portion, 5: thrust detection portion, 6: thrust detection plate, 6a: through steel, 7: workpiece support portion, 7a: guide rod, 8: torque detection portion, 9: Torque detection plate, 10: Radial bearing, 11, 12: Strain gauge, 13: Miniature stroke bearing, 1
4: Nut, 15, 16: Bolt, 17, 18: Small bolt, 19: Workpiece, 20: Micro drill

Claims (1)

[Scope of utility model registration request] 1. An arm having a receiving portion that is symmetric with respect to the axis of the main shaft and protrudes at both ends along the axial direction, and a tip that extends at both ends along the diametrical direction of the main shaft, the arm and the arm. A main support portion that rotatably supports the main shaft,
Both of the thrust detection plate, which has a thrust detection plate bridged and fixed between the two receiving parts, and a workpiece support part which is fixed to the thrust detection plate and is displaceably guided only in the axial direction of the main shaft, and the arm. A two-component force measurement which is provided with a torque detection part having a torque detection plate arranged in a predetermined position corresponding to the tip part, and a strain gauge is attached to the thrust detection plate and the torque detection plate. apparatus.