JP2000052115A - Work supporting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a work supporting device capable of identifying seating of a work. SOLUTION: A sensor nozzle 21 is provided on a base 2 of a work supporting device for closing a jet when a work is seated. The terminal of a sensor fluid tube 23 inserted into the axial center of a spindle with the end connected to the sensor nozzle for supplying a fluid is connected to the end of a freely rotatable tube shaft 22 assembled in a rotary joint 15 for rotation together with the spindle 1. An inflow port cylinder 24 into which a sensor fluid is supplied from the outside and which is connected to the end of the tube shaft via a mechanical seal 26 is provided in the terminal of the rotary joint to form a work in a seating sensor design and to supply a high pressure coolant.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for supporting a workpiece to be machined.

[0002]

2. Description of the Related Art Conventionally, as a supporting device for a workpiece to be machined, as disclosed in Japanese Patent Application Laid-Open No. 5-104312, a fluid to be supplied from an air tube inserted through a shaft of a spindle is used. The piston is moved by switching the piston to the front or rear side of the hollow chamber in the base through the branch-shaped passage rotating together with the piston to move the piston, and the plurality of gripping claws disposed on the front surface of the diaphragm with the movement of the piston are moved. It expands or contracts.

[0003] In addition, a coolant tube is built into the spindle of the spindle, and coolant liquid and air supplied from the coolant tube are supplied (as sprayed) to the work gripped by the gripping claws. It has become so.

As shown in FIG. 5, a coolant tube 63 is connected to the tip of a tube shaft 62 which is incorporated so as to freely rotate around the axis of a rotary joint 61, as shown in FIG. A tubular body 64 protruding from the end wall of the rotary joint 61 is fitted into the end of the tube shaft 62 so as to allow the tube shaft 62 to rotate.

The tubular body 64 is connected to a coolant or air pressure feed pipe 65.

According to the above configuration, since the pipe shaft 62 and the cylindrical body 64 are connected by a fitting method (to allow rotation at the fitting portion), the coolant liquid and air are sent under high pressure. Then, leakage occurs.

[0007] The leaked coolant or air flows into an annular hollow chamber 66 provided in the end of the stationary member 1 and is collected through a pipe 67 connected to the hollow chamber 66. ing.

Using such a coolant supply passage, a sensor for accurately seating the work to be gripped by the gripping claws of the air to be supplied to the coolant supply passage is provided (the work is brought into close contact with the air injection holes to prevent air from flowing out). In this case, air is leaked from the connection part of the above-mentioned fitting type, and the air pressure fluctuates. As a result, the sensor cannot function as a sensor. .

In addition, the above-mentioned problem can be solved by projecting a tube or a pipe shaft behind the rotary joint and connecting an air (also used for coolant) pipe to the protruding end through the rotary joint. .

However, since the length of the machine becomes extremely long, high-speed rotation cannot be performed due to the occurrence of vibration and vibration.
That is, the cost of the product increases.

SUMMARY OF THE INVENTION An object of the present invention is to provide a workpiece seating sensor specification, to enable high-pressure coolant supply, and to cope with high-speed rotation.

[0012]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a base which rotates with a spindle of a machine tool, a piston built in a hollow chamber provided in the base, and A passage that is provided so as to communicate back and forth, a fluid supply tube that is inserted into the spindle of the spindle and connects each end to the respective passage, and an outer peripheral edge fixed to a front peripheral edge of the base, and A diaphragm provided at the center for transmitting the movement of the piston via appropriate means, a plurality of gripping claws provided on the front surface of the diaphragm, and a supply path for a fluid supplied from a pipe provided at the end of the spindle. And a rotary joint to which the other end of the fluid supply tube is connected. And a tip connected to supply fluid to the sensor nozzle, and a terminal of a sensor fluid tube inserted into the axis of the spindle and rotating together with the spindle in the rotary joint. Connect the tip of the free-rotating pipe shaft that is incorporated so as to receive the supply of the sensor fluid from the outside into the terminal of the rotary joint, and connect it to the end of the pipe shaft via a mechanical seal. The structure which provided the inlet cylinder which was set is adopted.

Also, a coolant nozzle is provided on the base,
The coolant nozzle is connected to the inflow end of the coolant nozzle so as to receive the fluid supply from the sensor fluid tube, and a check valve that opens at a pressure higher than the sensor fluid pressure is provided in the coolant nozzle. Sometimes.

[0014]

Embodiments of the present invention will be described with reference to the accompanying drawings.

In the first embodiment of the present invention, as shown in FIGS. 1 to 3, a hollow chamber 3 is provided in a base 2 which rotates together with a spindle 1 of a machine tool.
Inside, a piston 4 is incorporated.

The base 2 is provided with a first passage 5 communicating with the front hollow chamber 3 of the piston 4 and a second passage 6 communicating with the rear hollow chamber 3 of the piston 4. When the fluid (air) is pumped from the second passage 6, the piston 4 moves forward, and when the fluid (air) is pumped from the first passage 5, the piston 4 retreats.

Further, a front surface of the base 2 is opposed to the front surface at a predetermined interval, and an outer peripheral edge is fixed to a peripheral portion of the base 2 via a fixing tool (not shown) such as a bolt. The center part is pushed out by the advance and retreat of the piston 4,
A retractable diaphragm 7 is provided.

As the interlocking means for pushing out and pulling back the center of the diaphragm 7 by the reciprocation of the piston 4, a screw cylinder 8 protruding from the front center of the piston 4 and a screw hole 9 at the center of the diaphragm 7 as shown in FIG. Are connected by screwing so that the slide of the piston 4 is directly transmitted to the diaphragm 7.
The system in which the reciprocating motion of the piston is applied via a slider that slides via a ball may be adopted.

On the front surface of the diaphragm 7, there are provided gripping claws 10 of the work A arranged appropriately.

The gripping claws 10 are radial (not shown).
The bolts 12 are screwed into screw holes 11 of the diaphragm 7 and attached.

The diaphragm 7 is made of, for example, a precipitation hardened alloy material, is machined in a solution treatment state, is heat-aged and hardened by age, and has a large notch tensile strength having an appropriate hardness.

Further, a rotary joint 15 having a first fluid supply path 13 and a second fluid supply path 14 is connected to a terminal of the spindle 1.
A fluid supply pipe 16 is connected to the supply path 14.

The outlet of the first supply passage 13 and the first passage 5
The two ends of a tube 18 inserted into a through hole 17 in the axis of the spindle 1 are connected to an inlet of the second supply passage 14 and an inlet of the second passage 6.

The tube 18 is made of, for example, nylon or other soft and light material.
Any material that can be easily cut or bent may be used. As the connecting means, for example, as shown in the figure, the fitting means is fitted in the hole 19 or the cylindrical part on the other side, and is attached in an airtight manner with an application adhesive, or by using a cylindrical screw-in type fastener 20. Do.

Further, a plurality of sensor nozzles 21 are provided on the front surface of the base member so as to close the injection port by the work A when the work A is accurately grasped and seated by the grasping claws 10.

The tip of the tube shaft 22 which rotates together with the spindle 1 incorporated in the axis of the rotary joint 15 and the end of the sensor nozzle 21 are connected to the sensor fluid tube 23 inserted through the axis of the spindle 1. Is connected.

The connection of the sensor fluid tube 23 is made by a fitting method with the opposite end.

The supply of the sensor fluid to the tube shaft 22 is supplied from a pipe 25 to an inlet tube 24 provided inside the end of the rotary joint 15. The distal end is connected via a mechanical seal 26 to supply fluid (air) and coolant air to the sensor nozzle 21 from the inlet tube 24 to the tube shaft 22 and the tube 23, and a coolant liquid by switching as necessary.

The reason is that high-pressure air for the purpose of blowing off cutting chips and high-pressure coolant for extending the cutting conditions and the life of the cutting tool can be switched as required.

As is well known, the mechanical seal 26 is provided with the rotary joint 15 (shown in FIGS. 1 and 3).
Of the hollow chamber 27, a passage 28 provided so as to communicate from the rear end wall of the hollow chamber 27 toward the rear with the pipe 25, and an inflow tube 24 fitted into the outlet side of the passage 28. A leakage preventing O-ring 30 interposed between the end of the cylinder and the collar 29, and an engaging means 31 (in the illustrated case, the flow restricting member is configured to stop the rotation of the inlet tube 24 and allow the inlet tube 24 to slide). Notch 33 provided in flange 32 of inlet tube 24
And a screw 34 screwed into the rear wall of the hollow chamber 27 and fitted into the notch 33).
A spring 35 for applying a protruding pressing force to the inlet tube 24 so as to press (press) the tip end surface of the tube 4 against the end surface of the tube shaft 22
It is composed of

With the above construction, fluid is supplied from the pipe 16 to the tube 18 through the first passage 5 to the front side of the piston 4 of the hollow chamber 3 to retract the gripping claws 10 while moving the piston 4 backward. A work A (shown in FIG. 4) is fitted and pressed to the outside of the closing gripping claw 10, and the press-in of the backward fluid of the piston 4 is released. A fluid is supplied to the rear side of the piston 4 in the hollow chamber 3 to expand the gripping claws 10 while moving the piston 4 forward, thereby gripping the work A.

While maintaining this gripping state, the pipe 25
Pumps fluid for sensor from.

Then, the fluid is directed from the passage 28 to the sensor nozzle 21 through the inflow tube 24, the pipe shaft 22, and the tube 23, and the injection port of the sensor nozzle 21 is closed by accurate seating of the work A. And there is no outflow of fluid,
If the seating of the work A is not accurate, the sensor nozzle 21
Fluid flows out of the injection port of.

Then, whether there is leakage of the sensor fluid,
Whether the work A is accurately seated or uncertain seating can be detected depending on whether or not the work A is seated.

Of course, a fluid having a stable and constant pressure flows from the inlet tube 24 to the pipe shaft 22 by the mechanical seal 26.

In the second embodiment of the present invention, as shown in FIGS.
1 and the tube 23 is attached to the coolant nozzle 41.
Through the passage 43 so as to receive the supply of the sensor fluid.

The coolant nozzle 41 is provided with a check valve 42 that opens at a pressure higher than the sensor fluid pressure.

With the above configuration, when processing the work A, the fluid is pumped to the tube 23 at a pressure higher than the sensor fluid pressure.

Then, the check valve 42 is opened, and the fluid is sprayed from the coolant nozzle 41.

The above-mentioned coolant fluid supplies a coolant liquid other than air.

[0041]

The work supporting apparatus according to the present invention is constructed as described above, so that the seating of the work can be confirmed accurately. That is, it is possible to find inconvenience when clamping the work.

For this reason, unmanned operation becomes possible, and the cost can be greatly reduced.

In addition to providing a coolant nozzle,
Since the coolant nozzle is provided with a check valve that opens at a pressure higher than the sensor fluid pressure, coolant can be supplied in addition to the seating confirmation sensor, and high pressure coolant can be supplied by the mechanical seal.

[Brief description of the drawings]

FIG. 1 is a longitudinal side view of a first embodiment according to the present invention.

FIG. 2 is a front view of the same.

FIG. 3 is an enlarged longitudinal side view of a mechanical seal.

FIG. 4 is a longitudinally enlarged side view of the second embodiment.

FIG. 5 is a longitudinal sectional side view of a conventional example.

[Explanation of symbols]

 Reference Signs List 1 spindle 2 substrate 3 hollow chamber 4 piston 5 first passage 6 second passage 7 diaphragm 8 screw cylinder 9 screw hole 10 gripping claw 13 first supply path 14 second supply path 15 rotary joint 16 pipe 17 through hole 18 tube 21 sensor Nozzle 23 Sensor fluid tube 24 Inlet tube 25 Pipe 26 Mechanical seal 27 Hollow chamber 28 Passage 29 Collar 30 O-ring 31 Engaging means 32 Flange 33 Notch 34 Screw 35 Spring 41 Coolant nozzle 42 Check valve

Claims (2)

[Claims] 1. A base rotating with a spindle of a machine tool, a piston built in a hollow chamber provided in the base, a passage provided in front and rear communication with the piston, and an axis of the spindle. A fluid supply tube which is inserted into the respective passages and has respective ends connected to the respective passages, an outer peripheral edge is fixed to the front peripheral edge of the base, and provided at the center so as to transmit the movement of the piston via appropriate means. A diaphragm, a plurality of gripping claws provided on the front surface of the diaphragm, and a rotary joint provided at the end of the spindle and connecting an end of the fluid supply tube to a supply path of a fluid supplied from a pipe. In the work supporting device, a sensor nozzle for closing the injection port by seating the work on the base is provided, and the sensor nozzle is provided. A free-rotating tube shaft having a tip connected to supply the fluid to the nozzle and having a terminal of a sensor fluid tube inserted into the axis of the spindle and a rotary shaft incorporated in the rotary joint so as to rotate with the spindle. The end of the rotary joint is connected to the end of the rotary joint, and the supply of the sensor fluid is supplied from the outside, and an inflow tube connected to the end of the pipe shaft via a mechanical seal is provided. Work support device. 2. A coolant nozzle is provided on the base,
The coolant nozzle is connected to the inflow end of the coolant nozzle so as to receive a fluid supply from the sensor fluid tube, and a check valve that opens at a pressure higher than the sensor fluid pressure is provided in the coolant nozzle. The work support device according to claim 1.