JP2009202266A - Workpiece carrier - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To supply fluid for opening and closing a workpiece holding claw without using a shaft center of a spindle. <P>SOLUTION: A workpiece carrier for sliding a piston 3 in a substratum 1 rotating together with the spindle B of a machine tool back and forth by a fluid to open the holding claw 10 comprises inlets 12 located at a plurality of positions on the substratum and a check valve 17 which opens in association with the fluid supplied from the inlets in the middle of inflow/discharge paths 13 and 14 communicating with paths front and rear the piston, a cylinder S on the side of the machine tool to align with the respective inlets when the substratum stops rotating, a first supply path 23 for supplying the fluid to a terminal end of a shaft center through path of a piston rod of the cylinder, a second supply path 25 and a third supply path 26 provided behind and in front of the piston of the piston rod to advance/retreat the piston rod by the supplied fluid, and a packing 29 provided on the opposite inlets and one of leading edges of the piston rod. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a work support device that does not supply fluid for moving an opening / closing piston of a gripping claw from a spindle axis.

  As a workpiece supporting device to be machined, a plurality of gripping claws arranged on the front surface of the diaphragm are expanded or contracted by utilizing deformation of the diaphragm as the piston moves.

The movement of the piston is such that fluid supplied from a tube or pipe inserted through the shaft core passage of the drive spindle of the piston built-in base acts on the front and rear sides of the piston (for example, (See Patent Document 1 and Patent Document 2).
Japanese Patent Laid-Open No. 10-43915 JP 2000-52115 A

  By the way, according to the configurations of Patent Documents 1 and 2, a plurality of fluid supply tubes and pipes are inserted into a passage provided in the shaft core of the drive spindle of the piston built-in base. And runout occurs in the pipe.

As a result, vibrations were generated, which adversely affected the workpiece and caused problems in machining accuracy.
In particular, the above problem becomes more prominent as the spindle rotates at a higher speed, which is not suitable for high-speed rotation processing.

In addition to opening and closing the gripping claw, sensors and coolant tubes are installed side by side, so the above problems become significant, and it is necessary to incorporate an anti-shake spacer in the spindle passage to keep each tube and pipe in order. There was also a problem.
Accordingly, the present invention is to provide a work support device that solves the above-described problems.

  In order to solve the above-described problems, the present invention advances and retracts a piston built in a hollow chamber in a base body that rotates together with a spindle of a machine tool by a pumping fluid from a passage communicating with the front and rear of the piston. In a work support device of a type that opens and closes a plurality of work gripping claws on the front surface of the base body through transmission means in accordance with advancing and retreating movement, an inlet provided at a plurality of scattered positions on the rear surface or outer peripheral surface of the base body and the above An inflow / discharge passage provided so as to communicate with a passage communicating before and after the piston, a check valve provided so as to open along with the fluid supply from the inflow port in the middle of the inflow / discharge passage, The cylinder is supported on the machine tool side so as to match the respective inlets under the rotation stoppage of the base body, and the end of the axial core passage of the piston rod of this cylinder is flowed to the end. A first supply path provided to supply the piston rod, a second supply path and a third supply path provided to move the piston rod forward and backward by a supply fluid to the piston rear side and front side of the piston rod, and the opposing The structure which consists of the inlet provided and the packing provided in the one end of the piston rod is employ | adopted.

  Then, the gripping claws can be expanded and contracted from the base rotating with the spindle.

  Since the workpiece support device of the present invention is configured as described above, the piston shaft tip of each cylinder supported by the machine tool and the rotation stop is positioned so as to be positioned on the outer periphery of the substrate rotating with the spindle or on the rear side of the substrate. In this situation, the piston rod and the inlet are sealed through the packing while the piston rod is moved forward while the fluid press-fitted from the second supply path is applied to the rear surface of the piston in the cylinder. Since the check valve is opened by the fluid press-fitted from the first supply passage, the fluid pressure is applied to the front side and the rear side of the piston in the base body from the inflow / discharge passage. There is no need to use a plurality of tubes or pipes inserted into the spindle core passage.

  For this reason, it is possible to eliminate the problem of adversely affecting the machining accuracy of the workpiece due to the vibration generated due to the insertion of the tube or pipe into the passage of the above-mentioned shaft core, and to perform high-speed rotation machining.

  In addition, since the check valve is provided, it is possible to keep the fluid pressure sealed when the spindle is moved backward by the fluid press-fitted from the third passage.

Embodiments of the present invention will be described with reference to the accompanying drawings.
In the embodiment of the present invention, as shown in FIGS. 1 to 4, a piston 3 is built in a hollow chamber 2 provided in a base body 1 that rotates together with a spindle B of a machine tool A, and the front and rear surfaces of the piston 3 are provided. The piston 3 is moved in the front-rear direction by applying fluid (air) from the passages 4 and 5.

In addition, a plurality of sets of gripping claws 10 for gripping a workpiece W that opens and closes via transmission means T as the piston 3 moves in the front-rear direction are provided on the front surface of the base body 1.
As shown in FIG. 2, for example, as shown in FIG. 2, the gripping claw 10 that is opened and closed by the transmission means T fixes the periphery of the diaphragm 6 to the periphery of the front surface of the base 1 via bolts 7, and the bolt 11 on the front radiation of the diaphragm 6. For example, the diaphragm 6 is attached so as to support the shape and size of the work W, and the inside and outside of the workpiece W, and the diaphragm 6 forwards from the piston 3 for transmitting the movement of the piston 3 to the center of the diaphragm 6. However, the present invention is not limited to this, but is performed by the connecting portion 8 that joins the opposite ends of the cylindrical body 9 projecting rearward from each other by a screwing method.

  In addition, a plurality of inlets 12 are provided in a scattered manner on either the peripheral surface or the rear surface of the substrate 1.

  One inlet 12 and the passage 4 on the front side of the piston 3 pass through the inflow / discharge passage 13, and the other inlet 12 and the rear surface side passage 5 of the piston 3 pass through the inflow / discharge passage 14. Connected.

  In the case shown in the figure, the inlets 12 are arranged at three points, and the other remaining inlet 12 is connected to the sensor nozzle 15 for detecting the presence or absence of the workpiece W through the passage 16. Accordingly, the number of fluid inlets 12 may be increased or decreased.

  Further, a check valve 17 is formed in the middle of each of the inflow / discharge passages 13 and 14 (passage 16) (the check valve 17 is formed by pressing a valve body 20 against a valve seat 18 via a spring 19 against the check valve 17). The valve body 20 is released from the valve seat 18 while compressing the spring 19 as the fluid (air) is pressed from the inlet 12.

  In addition, a cylinder S supported by the machine tool A is provided so as to match each inlet 12 under the rotation stop state of the base 1.

  A fluid (air) press-fitting first supply passage 23 (hose) is connected to the end of the passage 22 provided in the axial center of the piston rod 21 of the cylinder S, and the rear of the piston 24 of the piston rod 21. The second supply path 25 and the third supply path 26 for moving the piston rod 21 forward and backward by the supply fluid (air) to the front side and the front side (in the second supply path 25, the fluid press-fitting hose 27 in the third supply path 26) Is provided with a fluid pressure hose 28).

  Furthermore, a packing 29 is provided on one side of the facing surface of the inlet 12 and the piston rod 21.

  In the illustrated case, the packing 29 is provided by being fitted in the annular groove 36 on the front end surface of the piston rod 21, but is not limited thereto and may be provided on the inlet 12 side.

  In the figure, reference numeral 31 denotes an annular body bolted to the front surface of the machine tool A, and each cylinder S is supported on the annular body 31. 32 is a coolant liquid supply pipe inserted into the through hole 33 of the spindle core of the spindle B, and this pipe 32 does not rotate. Reference numeral 34 denotes a dust cover.

  In the following description, the expanding cylinder of the gripping claw 10 is designated as S, and the contracting cylinder of the gripping claw 10 is designated as S ′.

  If comprised as mentioned above, a fluid (air) pressure will be made to act on the rear surface of the piston 24 by press-fitting a fluid into the second supply path 25 from the hose 27 on the side of the compression cylinder S ′ of one gripping claw 10.

  Then, while the piston rod 21 is moved forward, the tip packing 29 of the piston rod 21 is pressed against the inlet 12 to keep the airtight. At this time, the valve body 20 is pushed and released while the spring 19 is compressed by the piston rod 21, so that the valve body 20 is released from the valve seat 18 and the check valve 17 is opened.

  Under this condition, fluid is supplied (press-fit) from the first supply path 23 to the passage 22 and the inflow port 12.

  Then, the press-fitting fluid flows into the front side of the piston 3 in the hollow chamber 2 through the passage 4 from the inflow / exhaust passage 13 and retracts the piston 3 while retracting the piston 3 to reduce the diameter of the gripping claw 10. So prepare for the set of work W.

  In order to set (grip) the workpiece W, fluid (air) is pressed into the second supply path 25 from the hose 27 on the expansion cylinder S side, and fluid pressure is applied to the rear surface of the piston 24.

Then, the fluid is supplied (pressed in) to the inlet 12 while the piston rod 21 is moved forward.
At this time, the valve body 20 is pushed and released while the spring 19 is compressed by the piston rod 21, so that the valve body 20 is released from the valve seat 18 and the check valve 17 is opened.

  Under this circumstance, when the fluid is supplied (press-fitted) from the first supply passage 23 to the passage 22 and the inlet 12, the supply of the fluid from the passage 22 and the inlet 12 from the supply passage 23 on the contraction cylinder S ′ side is stopped. The fluid on the front side of the piston 3 is discharged by the fluid pressure on the rear side of the piston 3 and the gripping claws 10 are expanded to grip the workpiece W.

  After that, the press-fitting of the fluid in the hose 27 of the expansion cylinder S and the contraction cylinder S ′ is stopped, the fluid is press-fitted from the hose 28, and the fluid pressure is applied from the third supply path 26 to the front side of the piston 24. Then, the piston 21 is moved backward.

  At this time, since the piston rod 21 moves backward, the valve body 20 is moved by the spring 19 and the check valve 17 is closed, so that the press-fitting fluid in the passage 5 is maintained. As a result, the gripping claws 10 are expanded. The open state is continued and the workpiece W is continuously gripped.

Next, the operation in the unclamped state and the clamped state will be added.
Prepare to set workpiece W (unclamped operation).
The pistons 21 of the contracting cylinder S ′ and the expanding cylinder S are advanced simultaneously.
Thereafter, the fluid is supplied (press-fitted) from the first supply path 23 on the side of the contracting cylinder S ′.
At this time, the fluid on the rear side is discharged from the first supply path 23 of the expansion cylinder S by the fluid pressure on the front side of the piston 3.

To clamp the workpiece W,
The pistons 21 of the expansion cylinder S and the compression cylinder S ′ are advanced simultaneously.
Thereafter, a fluid is supplied (press-fitted) from the first supply passage 23 on the expansion cylinder S side.
At this time, the workpiece W can be set when the fluid on the front side is discharged from the first supply passage 23 of the cylinder S ′ for contraction / contraction by the fluid pressure on the rear side of the piston 3.

  Thereafter, the piston rod 21 of the expansion cylinder S and the contraction cylinder S ′ is simultaneously retracted, so that the spindle B of the machine rotates at a high speed and the workpiece W can be machined.

  6 and 7 (for example, the method of Japanese Utility Model Publication No. 56-10483 and Japanese Patent Application No. 2007-102468) are shown in FIG. In this way, the front surface of the base body 1 that rotates together with the spindle B is recessed grooves 101 provided on a plurality of radial lines, and grips that are fitted in the respective recessed grooves 101 so as to slide within the range of engagement and disengagement. The master jaw 103 with the claw 102, the piston 105 incorporated so as to slide back and forth in the rear hollow chamber 104 of the master jaw 103 in the base 1, and each master jaw 103 is moved by the forward / backward slide of the piston 105. Transmission means T provided to be slid in the direction and the release direction, and in the center direction and circumferential direction of the base 1 behind each master jaw 103 in the base 1. And a lever 108 which has a fulcrum 109 in the middle and is movably engaged with the weight 108 and the master jaw 103 at both ends. The fluid press-fitting passages 4 and 5 communicating with the front and rear of the piston 105 of the hollow chamber 104 may be provided.

  Of course, the work support device for forming the master jaw 103 is provided with the inlet 12, the inflow / discharge passages 13 and 14, and the check valve 17 on the rotary base 1 side described in the work support device of the diaphragm 6 type. A cylinder S that matches each inflow port 12 is provided on the side under the rotation stop condition of the base 1 (the configuration of this cylinder S is the same as that of the diaphragm 6 type, and the description thereof is omitted).

The operation (operation) of the master jaw type work support device (illustrated) is the same as that of the above-described diaphragm 6 type work support device, and the description thereof will be omitted.
In the figure, reference numeral 131 denotes a nozzle provided at the tip of the coolant pipe 32.

The longitudinal side view which shows embodiment of this invention. The vertical expanded side view which shows the principal part same as the above. The longitudinal cross-sectional enlarged front view. The longitudinal section front view which shows the effect | action of a cylinder. The longitudinal section front view which shows the effect | action of a cylinder. The front view which shows the other example which opens and closes a holding nail. FIG.

Explanation of symbols

A Machine tool B Spindle S Cylinder T Transmission means W Work piece 1 Base body 2 Hollow chamber 3 Pistons 4 and 5 Passage 6 Diaphragm 7 and 11 Bolt 8 Connecting part 9 Cylindrical body 10 Grasp claw 12 Inlet and outlet path 15 Sensor nozzle 16 Passage 17 Check valve 18 Valve seat 19 Spring 20 Valve body 21 Piston rod 22 Passage 23 First supply passage 24 Piston 25 Second supply passage 26 Third supply passage 27, 28 Hose 29 Packing 36 Annular groove

Claims (1)

  A piston built in a hollow chamber in a base body that rotates together with a spindle of a machine tool is advanced and retracted by a pressure-feed fluid from a passage communicating with the front and rear of the piston, and the front surface of the base body is transmitted via a transmission means as the piston moves forward and backward In a workpiece support device of a type that opens and closes a plurality of workpiece gripping claws, it is provided so as to communicate with an inlet provided at a plurality of scattered positions on either the rear surface or outer peripheral surface of the base and a passage communicating with the front and rear of the piston. The inflow / discharge path, a check valve provided in the middle of the inflow / discharge path so as to open in response to the fluid supply from the inflow port, and the inflow / discharge path in accordance with the respective inflow ports under the rotation stop condition of the base. A cylinder supported on the machine tool side, a first supply path provided to supply fluid to the end of the axial through-passage of the piston rod of the cylinder, A second supply path and a third supply path provided so that the piston rod is moved forward and backward by a supply fluid on the piston rear side and front side of the piston rod; a packing provided on the opposite inlet and on one end of the piston rod; A workpiece support device comprising:

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