JPS62130153A - Cutting oil discharge detecting device - Google Patents

Abstract

PURPOSE:To always detect the flow of cutting oil correctly by detecting a condition where chips mixed in the cutting oil stay in a discharging nozzle or oil supply pipes to stop the flow of the oil and a valve in a floating state falls due to lowering of the flow pressure to touch the seat face. CONSTITUTION:When a flow path is blocked by chips and the flow of the oil is decreased even if oil pressure is applied due to operation of an oil supply pump, the flow pressure of oil in a valve body 1 is lowered and a valve 4 in a floating state falls and a detecting switch 6 is turned OFF to detect the flow rate decrease. Even if a lot of chips are mixed in the cutting oil due to circulating supply of the oil and left in the vicinity of a valve seat face 3, the seat face 3 which is tapered is not interfered by the chips and the valve 4 can touch the seat face 3 to prevent counter flow of the cutting oil. Furthermore, when the cutting oil is not allowed to flow even if the oil pressure is applied in the oil supply pipes 8a, 8b, the valve 4 is raised by the difference in pressure on the inlet side and the outlet side, therefore the valve 4 falls and the decrease or stop of the flow rate can be detected by the detecting switch 6.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a cutting oil discharge detection device for automatically supplying cutting oil in an NC automatic lathe or the like.

[Conventional technology]

In automated machine tools such as NC automatic lathes, interruption of the supply of cutting oil during cutting can cause serious accidents such as seizure. There is a need for a device that reliably detects that cutting oil is always being supplied to a predetermined position where a workpiece is being machined by an oil supply pump. However, until now, there has been no particular device that can reliably detect the supply of cutting oil, and the usual method is to measure the oil pressure in the oil supply pipe using a pressure switch, etc., and indirectly detect the supply of cutting oil based on the magnitude of the pressure. was.

However, a large amount of cutting chips mixed with the cutting oil accumulates in oil supply pipes and oil supply nozzles, and interferes with the flow path.
Even if the cutting oil stops flowing or disappears, the oil pressure in the oil supply pipe is high due to the supply pressure of the oil supply pump, so even if the oil pressure in the oil supply pipe is high, the machining part of the workpiece is not always supplied with oil.

[Problem that the invention seeks to solve]

As mentioned above, in the conventional technology, detection of cutting oil supply by measuring oil pressure indirectly detects the oil supply state, and cannot reliably detect the flow of cutting oil. There is a drawback that the supply of cutting oil at a certain position cannot be detected accurately. If the amount of cutting oil supplied decreases, tools such as cutting tools and workpiece parts may generate high heat, causing a fire, or the tools, workpiece parts, and spindle bearings may seize and damage the machine. If the chips accumulate in the oil supply pipe and close the flow path, the oil supply pump will run overloaded, causing problems such as failure of the pump. Additionally, measuring oil pressure using a pressure switch requires a complicated measurement mechanism.
This device has drawbacks such as being expensive to install.

The present invention solves these problems by providing a simple mechanism that can always accurately detect the flow of cutting oil and can be manufactured at low cost, even if a large amount of chips enter the cutting oil and adversely affect the amount of oil supplied. The object of the present invention is to provide a cutting oil discharge detection device having the following.

[Means for solving problems]

The present invention is characterized by the following configuration in order to solve the above-mentioned problems and achieve the object of the invention.

That is, an oil flow path is formed in the valve body, and a valve seat is formed on the flow path inlet side, and when the flow of oil in the flow path is stopped, the oil comes into contact with the valve seat, and , a valve body that moves away from the valve seat when oil is flowing, and a biasing means that biases the valve body toward the valve seat are built in, and the position of the valve body is detected in the valve body. This configuration is equipped with a detection switch.

[Effect]

In the cutting oil discharge detection device configured as above,
As shown in FIG. 1, when the flow of cutting oil is stopped, the valve body 4 rests in contact with a tapered valve seat surface 3 formed on the inlet side of the cutting oil flow path. When cutting oil is fed under pressure from the oil supply pipe 8a on the inlet side (in the direction of the lower arrow in FIG. 5 or against the weight of the valve body 4, the valve body 4 floats to a position balanced with the flow pressure of the cutting oil, and the cutting oil is released. It flows through the open circuit and is sent to the oil supply pipe 8b on the discharge side. In addition, chips mixed in the cutting oil may be inside the discharge nozzle 9 or the oil supply pipes 8a, 8b.
When the oil accumulates inside the oil, closes the flow path, and stops the flow, the valve body 4, which had been pushed up and floated by the fluid pressure of the cutting oil, is affected by the biasing force of the compression spring 5 or the valve body due to the decrease in fluid pressure. It descends due to the urging force of the body 4's own weight and comes into contact with the valve seat surface 3. That is, the discharge nozzle 9, the oil supply pipe 8a,
If chips accumulate in the valve body 8b and the like, closing the flow path and stopping the flow, the valve body 4 descends and comes into contact with the valve seat 3 even if the oil pressure is high.

The valve body 4 is configured such that a change in the position of the valve body 4 can be detected by a detection switch 6 disposed on the upper part of the valve body 4. Furthermore, when the supply of cutting oil is stopped, the flow path is closed and regulated by the valve body 4 in contact with the valve seat surface 3, so that the cutting oil is prevented from flowing back into the oil supply pipe 8a on the inlet side of the valve body. Ru.

〔Example〕

An embodiment of the present invention will be described below based on the drawings.

FIG. 1 is a longitudinal cross-sectional view of the main parts according to an embodiment of the present invention;
FIG. 2 is a longitudinal cross-sectional view showing a state in which cutting oil is flowing.

1 is a valve body, and screws la and lb for connection with oil supply pipes 8a and 8b are respectively provided on the lower cutting oil inlet side and the side cutting oil outlet side of the valve body 1; The lid 2 is screwed onto the valve body 1 by a connecting screw 1c via a packing 1d. A cutting oil flow path is formed within the valve body 1, and a valve seat surface 3 having a tapered conical shape facing inward is formed on the inlet side of the cutting oil flow path.

Reference numeral 4 denotes a valve body, and the lower end side outer peripheral portion of the valve body 4 abuts against the valve seat surface 3.

It is formed to close and increase the flow path of cutting oil.

The upper part of the valve body 4 is formed into a cylindrical shape, and is inserted into a hollow cylindrical support part formed on the inner surface of the valve lid 2, and is formed to be freely movable in the vertical direction.

A compression spring 5 that biases the valve body 4 toward the valve seat surface 3 is built into the lower end of the valve lid 2. When cutting oil is supplied and the fluid pressure increases, the valve body 4 is moved by the compression spring 5. It is pushed up against the biasing force and floats up as shown in FIG. 2, and the cutting oil comes to flow through the passage between the valve seat surface and the outer periphery of the side surface of the valve body. Here, the compression spring 5 may not be used as the biasing means, and the weight of the valve body 4 may be used as the biasing means, so that the dead weight of the valve body is balanced with the flow pressure of the cutting oil as a fluid. By doing so, it is possible to apply a biasing force similar to that of the compression spring 5.

A detection switch 6 is mounted on the upper surface of the switch mounting board 7 on the outside of the upper part of the valve lid 2, and the non-contact switch is configured to operate when the upper end of the valve body 4 reaches a predetermined height. has been done. Furthermore, the mounting position of the detection switch 6 can be adjusted by moving the mounting board 7 in the vertical direction, and the relationship between the floating ball position of the valve body 4 and the position at which the detection switch 6 is activated can be freely adjusted. .

Even if there is oil pressure due to the operation of the oil supply pump, the flow path is closed by chips, and when the flow of cutting oil decreases, the oil flow pressure inside the valve body 1 decreases, and the valve body 4, which had been floating, descends. However, the detection switch 6 is turned off and a decrease in the flow rate is detected.

By circulating and supplying the cutting oil, even if a large amount of chips are mixed into the cutting oil and are present around the valve seat surface 3, the valve seat surface 3 is formed in a tapered shape, so the chips will not interfere with the flow. The valve body 4 can be brought into contact with the valve seat surface 3 without causing the cutting oil to flow backward. In addition, the oil supply pipe 8a
Even if the cutting oil stops flowing even though there is oil pressure in 8b, the valve body 4 is raised due to the pressure difference (flow pressure) between the inlet side and the outlet side, so the valve body 4 will be lowered. , a decrease or stop of the flow rate is detected by the detection switch 6.

〔Effect of the invention〕

As is clear from the above description, the cutting oil discharge detection device according to the present invention has the following effects.

■ Even if the pressure of cutting oil in a flow path such as an oil supply pipe is high, if the cutting oil stops flowing, the flow pressure in the flow path will drop, so the detection switch will operate reliably and the supply of cutting oil will be interrupted. It is possible to detect that it has stopped.

■ The valve body is biased toward the valve seat using a compression spring or its own weight as biasing means, so even if a large amount of chips are mixed in the cutting oil, the valve will not be blocked by the chips. It operates normally without any problems, prevents backflow of cutting oil, and also functions as a check valve.

■ By detecting the floating position of the valve body due to the flow pressure of cutting oil, it is possible to constantly detect the supply, decrease, or stoppage of cutting oil, which prevents the risk of high heat generation in tools and workpieces due to a decrease in the amount of oil supplied. It can be prevented. Furthermore, failures due to overload operation of the oil supply pump caused by the cutting oil flow path being blocked by chips or the like can also be prevented.

■ The means for biasing the valve body against the valve seat surface can be formed so that the bias force is applied by the weight of the valve body instead of using a compression spring.The mechanism is further simplified, can be manufactured at low cost, and the detection switch can be By using a non-contact switch, the valve position can be reliably detected without being affected by chips.

[Brief explanation of drawings]

FIG. 1 is a vertical cross-sectional view of the main parts according to an embodiment of the present invention, and FIG. 2 is a vertical cross-sectional view showing the valve body in a floating state.

Claims (2)

[Claims] (1) An oil flow path is formed inside the valve body, and a valve seat is formed on the flow path inlet side, and when the flow of oil in the flow path stops, the oil comes into contact with the valve seat, and the oil The valve body is equipped with a built-in valve body that separates from the valve seat surface when the fluid is flowing, and a biasing means that biases the valve body toward the valve seat surface, and a detection switch that detects the position of the valve body is attached to the valve body. A cutting oil discharge detection device characterized by comprising: (2) In the valve body, the cutting oil discharge according to claim 1, characterized in that the valve body uses its own weight, which is biased toward the valve seat surface, as a biasing means. Detection device.