JPH0639674A - Machining device equipped with oil feeding circuit - Google Patents

Abstract

PURPOSE:To operate an oil feeding pump by utilizing the change of the air flow direction of an air pressure motor driving circuit, and to control the oil feeding timing and the oil feeding amount to a tapping position automatically, in a tapping device to carry out the tapping by rotating a tap with an air pressure motor. CONSTITUTION:The pressure chamber 62 of an oil feeding pump 6 is connected to a specific position of an air passage 12 to be an air flowing-in passage 12a to an air pressure motor 14 when the air pressure motor is rotated normally. An oil tank 7 is connected to the oil suction port 65 of the oil feeding pump 6 through a check valve 67, while an oil passage 68 facing a tapping position is connected to an oil releasing port 66. The piston 61 of the oil feeding pump 6 is energized to the upper side constantly.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is attached to a machining device utilizing fluid pressure for machining such as tapping for tapping with a tap, drilling holes, and reaming. The present invention relates to a machining device provided with an oil supply circuit used for supplying oil such as, and more specifically, to an oil supply circuit controlled by utilizing a fluid pressure such as air.

[0002]

2. Description of the Related Art Conventionally, when tapping is performed by a tapping device using fluid pressure, oil supply to a tapping point is controlled by an electric circuit on the side of an opening / closing valve and an electric power on the side of the tapping device which are interposed in an oil supply passage facing the tapping point. This was done by exchanging electrical signals with the circuit.

[0003]

However, complicated electric signal exchange is required to perform precise lubrication control in accordance with the timing of starting and ending thread cutting, the timing of starting and ending the withdrawal of taps, and the like. There was a problem. Similar problems occur in other machining processes such as drilling and reaming.

The present invention has been made in view of the above problems, and automatically utilizes a change in the flow direction of a fluid used in a machining device such as a tapping device to automatically determine an appropriate lubrication timing and amount. It is an object of the present invention to provide a machining apparatus including an oil supply circuit that can be controlled in a constant manner.

[0005]

According to another aspect of the present invention, there is provided a machining apparatus including an oil supply circuit, wherein one of the fluid supply source, the pair of fluid passages, and the fluid passage is connected to the fluid supply source, and the other remaining portion is connected. A motor drive circuit that includes a switching valve that opens the valve, a fluid pressure motor that is interposed in the fluid passage, and whose rotational direction is switched by reversing the flow direction of the fluid that accompanies switching of the switching valve, and a rotary shaft of the fluid pressure motor. A pressurizing chamber, an oil suction chamber having an oil suction port and an oil discharge port, and a chamber that is slidably connected only in the axial direction The pressurizing chamber of the oil supply pump provided with the constantly-biased piston serves as a fluid inflow passage to the fluid pressure motor when the fluid pressure motor rotates in the forward direction and a fluid outflow passage from the fluid pressure motor when the fluid pressure motor rotates in the reverse direction. Is connected to the specified location of the above fluid passage. , That the outlet of the oil tank is connected to the oil suction port through a check valve that allows the oil flow from the oil tank to the oil suction port, and the oil discharge port is connected to the oil supply passage facing the machining point. It has a feature.

In a machining apparatus having an oil supply circuit of this structure, a speed control valve is provided in a connection passage between a fluid inflow passage at the time of forward rotation of a fluid pressure motor and a pressurizing chamber of an oil supply pump. It is also possible to intervene or to interpose a check valve in the oil supply passage, which permits the oil flow from the oil discharge port of the oil supply pump to the machined portion.

[0007]

Next, the operation of the tapping device as an example of the machining device will be described. According to the oil supply circuit for a tapping device of claim 1, during normal rotation of the fluid pressure motor, that is, during tapping operation, a part of the fluid flowing through the fluid inflow passage to the fluid pressure motor flows into the pressurizing chamber of the oil supply pump. , The piston of the oil supply pump overcomes the bias in the oil suction direction by the fluid pressure of the pressurizing chamber at that time and is pushed in, and along with that, the oil sucked in the oil suction chamber of the oil supply pump is pushed out from the discharge port, It is supplied to the tapping point via the oil supply passage.

When the fluid pressure motor is rotated in the reverse direction, that is, after the tapping operation is completed and the tap is pulled out, the fluid outflow passage from the fluid pressure motor (opened by the switching valve) is located in the pressurizing chamber of the oil pump. Therefore, the piston of the oil supply pump moves by being biased in the oil suction direction. Therefore, the oil in the oil tank is sucked into the oil suction chamber through the check valve.

According to the machining apparatus having the oil supply circuit of the second aspect, the inflow speed of the fluid into the pressurizing chamber of the oil supply oil pump is controlled by the speed control valve interposed in the connection passage.

According to the machining apparatus having the oil supply circuit of the third aspect, when the piston of the oil supply pump moves in the oil suction direction, the reverse flow of the residual oil in the oil supply path is prevented by the check valve in the oil supply path. .

[0011]

1 and 2 are pneumatic circuit diagrams in which a tapping device B utilizing air pressure is provided with an oil supply device A according to an embodiment of the present invention.

The tapping device B includes an air supply source 11,
The motor drive circuit 1 includes an air passage 12, a switching valve 13, and an air pressure motor 14. A two-position four-port switching valve is used as the switching valve 13. With this switching valve 13, one end of the air passage 12 is connected to the air supply source 11 regardless of which position the switching valve 13 is switched to. Open to the other end or atmosphere. Further, the rotation direction of the air pressure motor 14 is switched by reversing the flow direction of air accompanying the switching of the switching valve 13.

The shaft 2 is spline-fitted to the rotary shaft 15 of the pneumatic motor 14 and is slidably connected only in the axial direction. The shaft body 2 may be for attaching a tap (not shown) or may be the tap itself. The shaft body 2 is rotatably connected to the piston 32 of the cylinder 3 including the cylinder tube 31 and the piston 32, and reciprocates in the axial direction together with the piston 32. The cylinder tube 31 has an air supply port 33.
And an exhaust port 34. Also the piston 32
Is always biased in the backward direction (upward in the figure) by a biasing means 35 such as a spring.

A passage 41, a check valve 42, and a passage 4 are provided between the exhaust port 34 and the pilot chamber 16 of the switching valve 13.
3, check valve 44, passage 45, and passage 4
3, a speed control valve 46 including a variable throttle and a check valve is branched and connected. The outlet of the variable throttle of the speed control valve 46 is open to the atmosphere. Check valve 4
The passage 47 is connected to the exit of 2 and this passage 47 is YES
It is connected to the port a of the element 48, and the air supply source 11 is connected to the port p of the YES element 48 via the passage 49. The port s of the YES element 48 is connected to the pilot chamber 16 via the passage 50.

The tapping device B described above is an example, and the tapping device B has another configuration, for example, an electric signal from a limit switch or the like that switches the switching valve 13 on and off according to the position of the shaft 2. It may be performed.

The refueling device A includes a refueling pump 6 and an oil tank 7.
have. The internal space of the oil supply pump 6 is divided into a pressurizing chamber 62 and an oil suction chamber 63 by a piston 61, and the piston 61 is constantly urged in the oil suction direction (upward in the figure) by a biasing means 64 such as a spring. It is energized. The oil suction chamber 63 has an oil suction port 65 and an oil discharge port 66.
Is provided, the outlet 71 of the oil tank 7 and the oil suction port 65 are connected via a check valve 67 that allows an oil flow from the oil tank 7 to the oil suction port 65, and the oil discharge port 66 is provided with an oil supply passage 68. Are connected. The tip of the oil supply passage 68 faces the tapping point, and the oil discharge port 66 is provided on the way.
Check valve 6 allowing oil flow from the pipe to the tapping point
Have 9.

Further, the pressurizing chamber 62 of the oil supply pump 6 and the air inflow passage 12a to the air pressure motor 14 when the air pressure motor 14 is normally rotated become the air outflow passage 12b from the air pressure motor 14 when the air pressure motor 14 is rotated in the reverse direction. Is connected to a predetermined portion of the air passage 12 via a connection passage 8 and a speed control valve 9 including a variable throttle and a check valve. Further, the connection passage 8 and the air supply port 3 of the cylinder 3
3 and 3 are connected by a passage 51.

With the above construction, when the switching valve 13 of the tapping device B is set to the position shown in FIG. 1, the air pressure motor 14 is normally rotated to perform tapping. That is, a part of the air flowing through the air inflow passage 12a enters the cylinder 3 via the speed control valve 9 and the passage 51, and the piston 3
Push in 2. Further, another part of the air flowing through the air inflow passage 12a flows into the pressurizing chamber 62 of the oil supply pump 6 through the speed control valve 9 and the connecting passage 8, and the piston 61 is driven by the air pressure in the pressurizing chamber 62 at that time. Is pushed against the urging force of the urging means 64, and accordingly, the oil sucked into the oil suction chamber 63 is pushed out from the oil discharge port 66 by a fixed amount corresponding to the stroke of the piston 61, and is checked with the oil supply passage 68. It is supplied to the tapping point via the valve 69.

Here, the air that enters the cylinder 3 and pushes the piston 32 assists the tapping of the work (not shown) at the initial stage of tapping, and after the tap bites into the work, the load of the air pressure motor 14 is increased. Help to reduce. Further, if the throttle degree of the variable throttle in the speed control valve 9 is adjusted, the pressurizing chamber 6 of the oil supply pump 6 is adjusted.
The inflow speed of the air to 2 or the moving speed of the piston 61 is adjusted, so that the oil supply speed and the oil supply amount to the tapping portion are accurately performed. Since the number of tapping operations and the number of reciprocations of the piston 61 of the oil supply pump 6 correspond to each other, the amount of oil consumption is calculated by counting the number of tapping operations or the number of reciprocations of the piston 61. It is also easily possible to replace the tank 7 with a cartridge-type tank having a constant capacity and replace the cartridge each time the count reaches a predetermined number.

When the piston 32 of the cylinder 3 passes through the exhaust port 34 as shown in FIG. 2 as the tapping operation progresses, the air in the cylinder 3 passes through the exhaust port 34, the passage 41, the check valve 42, and the passage 47, and the YES element. 48, and the pressure at port a becomes high. Further, since the YES element 48 receives air from the air supply source 11 of the passage 49 and the port p has a high pressure, the high pressure air is supplied from the port s to the passage 50.
Is sent to the passage 45, and the pressure of the air acts on the pilot chamber 16 to switch the switching valve 13 as shown in FIG. Then, the direction of the air flow in the air passage 12 is reversed, the air pressure motor 14 is reversed, and tap withdrawal starts. Further, since the air outflow passage 12b from the air pressure motor 14 is connected to the pressurizing chamber 62 of the refueling pump 6, and the air outflow passage 12b is opened to the atmosphere by the switching valve 13, the pressurizing chamber of the refueling pump 6 is opened. 62 drops and piston 61
Is moved in the oil suction direction by the force of the biasing means 64, and the movement causes the oil in the oil tank 7 to be sucked into the oil suction chamber 63 via the check valve 67, and is ready for the next tapping operation.
When the piston 61 moves in the oil suction direction, the backflow of the residual oil in the oil supply passage 68 is prevented by the check valve 69 in the oil supply passage 68. Further, the piston 32 of the cylinder 3 rises above the exhaust port 34, and the communication between the exhaust port 34 and the air supply port 33 is cut off. The pressure reducing speed of the port a at this time is adjusted by adjusting the degree of throttling of the variable throttling in the speed control valve 46. Therefore, the timing at which the air output from the port s is eliminated can be adjusted by adjusting the throttle degree of the variable throttle in the speed control valve 46. When the pressure at the port a drops in this way, the air output from the port s of the YES element 48 disappears and the pilot chamber 16 drops in pressure accordingly, so the switching valve 13 switches to the position shown in FIG. 1 and the tapping operation starts again. .

Although air pressure is used as the fluid pressure in this embodiment, hydraulic pressure can also be used as the fluid pressure. Further, although the tapping device B is provided with the oil supply device A in the embodiment, the oil supply device A is also applied to other machining devices such as a drilling device and a reaming device.
Can be attached.

[0022]

According to the machining apparatus having the lubrication circuit of the first aspect, the lubrication to the machining area is automatically performed only during the machining operation without exchanging the electric signal. Since the refueling is automatically stopped when the processing work is not performed, there is an effect that the control configuration can be simplified.

According to the machining apparatus having the oil supply circuit of the second aspect, the oil supply speed to the machined portion can be adjusted according to the machining speed, and the machining operation having the oil supply circuit of the third aspect. According to the device, it is possible to prevent the reverse flow of oil in the oil supply passage.Therefore, it is possible to accurately control the amount of oil supplied to the machined part and the timing of oil supply or stop oil supply to prevent wasteful consumption of oil. There is also an effect that is possible.

[Brief description of drawings]

FIG. 1 is a pneumatic circuit diagram during normal rotation of an air pressure motor when a tapping device is provided with an oil supply device according to an embodiment of the present invention.

FIG. 2 is a pneumatic circuit diagram at the time of reverse rotation of an air pressure motor when a tapping device is provided with an oil supply device according to an embodiment of the present invention.

[Explanation of symbols]

 A oil supply circuit B tapping device 1 motor drive circuit 2 shaft body 7 oil tank 9 speed control valve 11 air pressure supply source (fluid supply source) 12 air passage (fluid passage) 12a air inflow passage (fluid inflow passage) 12b air outflow passage (Fluid outflow path) 13 Switching valve 14 Air pressure motor (fluid pressure motor) 15 Rotating shaft 61 Piston 62 Pressurizing chamber 63 Oil suction chamber 64 Energizing means 65 Oil suction port 66 Oil discharge port 67 Check valve 68 Oil supply channel 69 check valve

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Kenji Ichiyama Inventor Kenji Ichiyama 23 23, Otsu, Komatsu-shi, Ishikawa Komatsu Ltd. Awazu Plant

Claims (3)

[Claims] 1. A fluid supply source, a pair of fluid passages, a switching valve that connects one of the fluid passages to the fluid supply source and opens the other remaining portion, and a switching valve interposed in the fluid passage for switching the switching valve. A motor drive circuit comprising a fluid pressure motor whose rotation direction is switched by reversing the flow direction of the fluid, and a shaft body slidably connected only to the rotation shaft of the fluid pressure motor only in the axial direction, Further, the pressurizing chamber of the oil supply pump including the pressurizing chamber, the oil suction chamber having the oil suction port and the oil discharge port, and the piston that divides these chambers and is constantly biased in the oil suction direction is , Connected to a predetermined part of the fluid passage that serves as a fluid inflow path to the fluid pressure motor when the fluid pressure motor rotates in the forward direction and serves as a fluid outflow path from the fluid pressure motor when the fluid pressure motor rotates in the reverse direction. The outlet from the oil tank to the oil inlet. A machining apparatus provided with an oil supply circuit, which is connected through a check valve that allows a flow of oil, and an oil supply passage facing a machining area is connected to the oil discharge port. 2. A refueling circuit according to claim 1, wherein a speed control valve is interposed in a connection passage between a fluid inflow passage at the time of normal rotation of the fluid pressure motor and a pressurizing chamber of the refueling pump. Machine processing equipment. 3. A machine provided with an oil supply circuit according to claim 1 or 2, wherein a check valve for allowing an oil flow from an oil discharge port of the oil supply pump to a machined portion is interposed in the oil supply passage. Processing equipment.