JPH0551538U - Automatic tightening type vise device - Google Patents

Abstract

(57) [Abstract] [Purpose] In an automatic tightening type vise device for machine tools, it is possible to fix the material block in a properly centered state and under an appropriate tightening force. [Structure] Four vise units 2 including a guide mechanism, a drive mechanism, and a vise base 4 are arranged orthogonally on a base 1. Each vise unit 2 is provided with a position sensor 11 that detects the position of the vise table 4. Each vise table 4 is provided with a mouthpiece 12 to be tightened, and the wedge body 17 of the tightening mechanism 13 tightens this. Pressure sensor 2 on wedge 17
2 is provided to detect the tightening force.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 Steel materials of various sizes that have been cut and shaped into rectangular parallelepipeds are commercially available as materials for forming dies for press molding and dies for plastic molding. The present invention relates to an automatic tightening type vise device suitable for fixing such a material on a table of a metal machine tool.

[0002]

[Prior Art]

 A vise device which is used by being fixed to a table of a machine tool is known from Japanese Patent Application Laid-Open No. 3-14172 and Japanese Utility Model Laid-Open No. 63-74275. Further, it is known from Japanese Utility Model Laid-Open No. 62-156466 that clamping of the vice base is performed by hydraulic pressure.

[0003]

[Problems to be solved by the device]

 When fixing the material on the table of the machine tool, if the center position of the material is aligned with the center of the spindle of the processing machine, it is easy to calculate the feed amount of the cutting tool during processing, resulting in a failure due to incorrect calculation. Can be reduced. In particular, with a numerical control type processing machine, it is possible to save the labor of recalculating the position dimensions to be input. In this respect, the above-mentioned vise device in which the opposing vise bases move close to each other at the same time to fix the material is convenient in that the center position of the material can be substantially aligned with the center of the spindle.

However, if the material has a sufficiently large allowance, the conventional apparatus as described above can perform the processing without any trouble, but if the allowance is very small, there is a possibility that processing defects will occur. For example, a commercially available steel block that has been cut and shaped into a rectangular parallelepiped has a nominal size added with a grinding allowance of 0.2 to 0.5 mm. If such a material is used, centering work is separately performed. It must be done and the material cannot be installed quickly.

In the form in which the material is sandwiched and fixed by the pair of vise bases, when the feed direction of the cutting tool and the tightening direction of the vise base intersect, the material may move along the clamping surface, so that the material is securely fixed. I can't do it. Furthermore, when sandwiching a plate-shaped thin material block, it is difficult to sandwich the material exactly. In many cases, the tightening force tends to be excessive.

An object of the present invention is to automatically fix a material block in a state where it is correctly positioned with respect to the center of a spindle of a processing machine, and to accurately set a dimensional reference position during processing, if necessary. To get the equipment. Another object of the present invention is to provide an automatic tightening type vise device that can quickly and securely clamp and fix material blocks of various sizes with different vertical and horizontal dimensions and thickness dimensions, and can also secure material blocks with an appropriate clamping force. To get.

[0007]

[Means for Solving the Problems]

 The vice device of this invention has a vice table 4, a guide mechanism for guiding the vice table 4 along a straight line, and a vice unit 2 including a drive mechanism for reciprocating the vice table 4 along the guide mechanism. , Four of the vise units 2 are arranged on the base 1 in an orthogonal manner, each of the vise units 2 is provided with a position sensor 11 for detecting the transition position of the vise base 4, A base 12 for supporting the material block M is supported on each of the bases 4 so as to be movable by a certain amount along the transition direction of the vice base 4, and the base 12 is provided between each vice base 4 and the base 12. A tightening mechanism 13 for pressing the material block M and a pressure sensor 22 for detecting the tightening force of the mouthpiece 12 are provided, and the shape data of the material block M input in advance and the position data are input. Based on the input signal from the service 11, and the pressure sensor 22, it is a requirement that a control device 23 for controlling the drive mechanism and clamping mechanism.

Specifically, the tightening mechanism 13 is configured to include a wedge body 17 for pressing and operating the mouthpiece 12, a fluid pressure cylinder 19 and a control valve 20 for reciprocating the wedge body 17, and Attach the pressure sensor 22.

[0009]

[Action]

 Based on the shape data of the material block M input in advance to the control device 23, the four vise bases 4 are individually operated to be moved to positions where the material block M should be supported by the drive mechanism. At this time, a position sensor 11 is provided in order to know the position of each vice table 4 accurately. By the signal from the position sensor 11, each vice body 4 can accurately support the material block M at the designated coordinates and then pinch and fix it. The drive mechanism moves the vise table 4 for placing the material block M on the mouthpiece 12 and then moving the vise table 4 for temporary tightening.

A tightening mechanism 13 is provided to perform the final tightening of the material block M by the vise table 4, and a pressure sensor 22 is provided to confirm the tightening force. The control device 23 actuates the tightening mechanism 13 based on the shape data of the material block M input in advance, and when the pressure sensor 22 detects that the tightening force has reached the predetermined value, the operation of the tightening mechanism 13 is started. Stop. The cap 12 can be moved by a certain amount in order to obtain the necessary tightening force by moving the cap 12 to the side of the material block M by the tightening amount at the time of final tightening.

[0011]

[Effect of the device]

 According to the vise device of the present invention, the four vise bases 4 can be accurately positioned with respect to the center of the spindle of the processing machine or at a predetermined position, and the material block M can be fixed at that position. That is, even in the case of material blocks M having different sizes, by inputting their shape data in advance to the control device 23, the state in which they are centered with respect to the center of the spindle or the dimension reference position at the time of machining is set to coincide with the center of the spindle. You can fix it in the correctly positioned state by clicking. Therefore, it is possible not only to prevent the occurrence of defects due to incorrect calculation of the feed amount of the cutting tool during machining, but also to perform proper machining without causing defects even when machining the material block M with a small machining allowance. The material cost can be kept to a minimum.

Since the vise base 4 can be positioned according to the vertical and horizontal shapes and sizes of the material blocks M, even the material blocks M of different sizes can be quickly fixed, and further the four material blocks M can be used by the four bases 4. It is possible to securely clamp and fix the material to prevent the material block M from shifting during processing. Based on the shape data of the material block M, the tightening force can be adjusted to large or small, so that the material block M can be tightened without excess or deficiency, and when processing a thin plate-shaped material block M or a soft material, It is possible to eliminate a decrease in surface accuracy and position accuracy after processing due to internal strain during tightening, and plastic deformation of the material block M due to excessive tightening.

[0013]

【Example】

 1 to 5 show an embodiment of a vise device according to the present invention. In FIG. 2, the vise device has a horizontally long base 1 mounted and fixed on a table of a processing machine, and four vise units 2 arranged orthogonally on the plate surface of the base 1. As shown in FIG. 1, the material block M is clamped and fixed by two sets of vice units 2 that face each other in the left-right direction and the front-rear direction with the central support frame 3 interposed therebetween.

The vise unit 2 includes a vise table 4, a guide mechanism for reciprocating and guiding the vise table 4 with respect to the support frame 3, and a drive mechanism for reciprocally operating the vise table 4 along the guide mechanism. .. The guide mechanism includes a pair of guide shafts 5 arranged in parallel, a support frame 3 and a bracket 6 that support the guide shafts 5 at both shaft ends. As shown in FIG. 3, the pair of guide shafts 5 penetrate and support both lower ends of the vise table 4. The drive mechanism uses a geared motor 7 capable of forward and reverse rotation as a drive source, and transmits its power to the vise table 4 via a screw shaft 9 and a female screw block 10 (see FIG. 1) engaged with the screw shaft 9, The vice table 4 is moved back and forth. The screw shaft 9 is arranged in parallel between the pair of guide shafts 5 and is rotatably supported by the support frame 3 and the bracket 6. The female block 10 is fixed to the center of the lower surface of the vise table 4. In order to protect the geared motor 7 from the splashed cutting oil, the upper and lower surfaces of the support frame 3 are hermetically sealed.

In FIG. 1, in order to detect the current position of the vise table 4 and the position after the movement, a position sensor 11 is provided using a screw shaft 9. Specifically, the detection gear 12 is fixed to the end of the shaft 9 on the geared motor 7 side so as to be able to rotate together, and the position sensor 11 composed of a magnetic resistance element type rotation angle sensor is arranged close to the outer peripheral surface thereof. ing. From the output signal from the position sensor 11, the rotation number of the screw shaft 9 and the rotation angle of less than one rotation can be known, and the movement amount of the vise table 4 can be specified from these, and the coordinate position on the base 1 can be known. .. The current position of the vise table 4 can be stored by storing the position of the vise table 4 at the time of previous use, or by moving the vise table 4 to one end of the screw shaft 9 and then moving it to an arbitrary position. Can be found by

The vise base 4 is assembled with a mouthpiece 12 for additional tightening and a tightening mechanism 13 for pressing the mouthpiece 12 toward the material block M. The base 12 is made of a metal block having an L-shaped cross section. As shown in FIG. 3, slide legs 14 having trapezoidal cross sections provided at two places on the lower surface thereof are fitted into guide grooves 15 provided on the vise base 4. Thus, the vice base 4 is supported so as to be movable by a certain amount in the direction parallel to the screw shaft 9. If several types of bases 12 having different vertical dimensions and cross-sectional shapes are prepared, the bases 12 can be exchanged and attached to the vise table 4 simply by fitting the bases 12 into the guide grooves 15.

In FIG. 1, the tightening mechanism 13 includes a wedge body 17 arranged between a back wall of the mouthpiece 12 and a slope wall 16 facing the back wall, and a hydraulic drive for vertically operating the wedge body 17. A fluid pressure cylinder 19 and an electromagnetically operated control valve 20 that controls the operation of the fluid pressure cylinder 19 are included. The fluid pressure cylinder 19 can be driven in either the withdrawal direction, and when the wedge body 17 is moved upward via its piston rod, the material block M is tightened via the mouthpiece 12. 21 is a hydraulic pump.

In order to detect the tightening force of the mouthpiece 12, a pressure sensor 22 is attached to the wedge body 17. The pressure sensor 22 uses a bulk semiconductor as a sensor element, and is mounted in contact with the back wall of the base 12 to output a change in pressure as a change in electrical resistance.

The above devices are controlled by the control device 23. A control board 24 for the control device 23 is shown in FIG. On the control panel 24, there are ten keys 25 for inputting the dimensional data of the material block M, and four fastenings for changing the fastening force according to the thickness of the material block M and the hardness of the forming material. The force setting key 26, four displays 27 for displaying the coordinate position of each vise stand 4, a lamp 28 for indicating the completion of tightening, and a position surrounding the lamp 28 for operating the vise stand 4 A vise selection button 29 for selecting the start position and two start buttons 30 and 31 for starting the movement and the final tightening of the vise base 4 are arranged.

Next, the operation of the vise device will be described. As shown in FIG. 5, when using the vise device, the dimensional data is input with the ten keys 25 in advance and the tightening force is selected with the tightening force setting key 26. Further, the vise selection button 29 is operated to select the vise base 4 to be operated. These data are stored in the control device 23.

When the start button 30 is turned on after the input of the necessary data is completed as described above, the control device 23 calculates the position to move from the current position of each vise stand 4 and starts the geared motor 7. Then, the vise table 4 is moved via the screw shaft 9. The pair of vise stands 4 stop and stand by at a facing gap position slightly larger than the vertical and horizontal dimensions of the material block M. In this state, the material block M is placed on the four caps 12. When the start button 30 is turned on again, the vise table 4 moves to pinch and fix the material block M from the four sides via the mouthpiece 12. At this time, the center of the material block M exactly matches the center of the base 1. Therefore, as long as the base 1 is properly attached to the processing machine table, the center of the material block M can be aligned with the center of the spindle. The geared motor 7 at the time of temporary tightening is stopped by receiving a signal output from the position sensor 11.

In the temporarily tightened state, the back wall of the mouthpiece 12 is received by the vise table 4. From this state, when the start button 31 is turned on and the fluid pressure cylinder 19 is operated, the wedge body 17 rises and interrupts between the base 12 and the sloped wall 16, and the base 12 is opened as shown in FIG. Press on the material block M. At the same time as this pressing operation, the pressing reaction force acts on the pressure sensor 22, so that the tightening force can be known. When the tightening force reaches the set value, the control device 23 issues a switching instruction to the control valve 20 to stop the operation of the fluid pressure cylinder 19 and maintain the state.

When the processing is completed, the release button is turned on to return the tightening mechanism 13 to the standby state, and further move the vise table 4 to the state when the material is placed. After that, when processing the material block M of the same size, the material block M is attached, temporarily tightened, and finally tightened in order, and the material block M is repeatedly processed. If the substrate size is different, repeat the above steps from the beginning.

Depending on the processing content, it may be more convenient to position the specific dimension position of the material block M at the center position of the base 1. In such a case, the coordinate position of each vice table 4 can be input to fix the material block M at a position displaced from the center of the spindle of the processing machine. Further, when performing end face machining on the four periphery, the vise base 4 corresponding to the surface to be machined is retracted to the outer end side of the screw shaft 9, and the other three vise bases 4 are used for the material block M. Can be clamped and fixed. Of course, it is also possible to move the four vise bases 4 to arbitrary positions to fix the material block M and perform surface processing of the upper surface thereof. Since it is tightened with four vise bases 4, it is also possible to fix hexagonal or circular material blocks.

Besides the above, a narrow guide can be used as the guide mechanism. A hydraulic motor can be used as the drive source of the drive mechanism, and a worm-rack mechanism or the like can be applied as the power transmission body in addition to the screw shaft 9. As the position sensor 11, a sensor that directly reads the absolute position of the vise table 4 can be used. As a driving method of the tightening mechanism 13, a mechanism for converting the rotational force of the motor into a linear motion can be used instead of using the fluid pressure cylinder 19.

[Brief description of drawings]

FIG. 1 is a vertical sectional view showing a schematic structure of a vise unit.

FIG. 2 is a schematic plan view of a vise device.

3 is a cross-sectional view taken along the line AA in FIG.

FIG. 4 is a front view of a control panel.

FIG. 5 is a block diagram showing a work procedure of the vise device.

[Explanation of symbols]

 1 Base 2 Vise Unit 4 Vise Table 5 Guide Shaft 9 Screw Shaft 11 Position Sensor 12 Clasp 13 Tightening Mechanism 17 Wedge 22 Pressure Sensor 23 Controller M Material Block

Claims (2)

[Scope of utility model registration request] 1. A vise unit 2 including a vise table 4, a guide mechanism for guiding the vise table 4 along a straight line, and a drive mechanism for reciprocating the vise table 4 along the guide mechanism.
An automatic tightening type vise device in which four of the vise units 2 are arranged orthogonally on the base 1, and the transition position of the vise base 4 is detected for each vise unit 2. A position sensor 11 is provided, and a cap 12 for supporting the material block M is supported on each of the vice bases 4 so as to be movable by a predetermined amount along the transition direction of the vice bases 4. Between the base 12 and the base 12, a tightening mechanism 13 for pressing the base 12 against the material block M and a pressure sensor 22 for detecting the tightening force of the base 12 are provided. A control device 23 that controls the drive mechanism and the tightening mechanism based on the data and the input signals from the position sensor 11 and the pressure sensor 22.
Automatic tightening type vise device equipped with. 2. The tightening mechanism 13 includes a wedge body 17 for pressing and operating the mouthpiece 12, a fluid pressure cylinder 19 and a control valve 20 for reciprocating the wedge body 17, and a pressure is applied to the wedge body 17. The automatic tightening type vise device according to claim 1, wherein a sensor 22 is attached.