KR101245927B1 - Work piece adhesion certification device for preventing coolant infiltration - Google Patents

Abstract

The present invention provides a work closeness confirmation device capable of preventing coolant intrusion by preventing coolant intrusion during work of the workpiece in advance to prevent back pressure malfunction caused by the coolant that has previously penetrated therein so that there is no error in checking the close contact of the workpiece. An apparatus for checking the adhesion state of a workpiece mounted on a reference surface, comprising: a pneumatic source; A pressure regulator valve for sensing the pressure discharged from the pneumatic source; A first solenoid valve for opening and closing a pipe connecting the sensing pressure control valve and the air discharge port of the reference surface; A pressure sensing means installed in a conduit connecting the first solenoid valve and an air discharge port to switch off the first solenoid valve to block the conduit when a predetermined pressure is detected; The second solenoid valve is installed in parallel with the first solenoid valve on the inlet side of the sensing pressure control valve, and continuously supplies air from the pneumatic source to the air outlet when the pressure sensing means is on. Characterized in that included.

Work piece contact, fixture, back pressure, coolant

Description

Work piece adhesion certification device for preventing coolant infiltration}

The following drawings, which are attached in this specification, illustrate preferred embodiments of the present invention, and together with the detailed description of the present invention, serve to further understand the technical spirit of the present invention. It should not be construed as limited to.

1 and 3, 4 are various close state of the workpiece clamped in the jig.

2 is a pneumatic circuit diagram for confirming the close contact state of a conventional workpiece.

5 is a circuit configuration of the workpiece close-up confirmation device capable of preventing coolant intrusion according to the present invention.

Figure 6 is a control flow diagram of the workpiece tightness confirmation apparatus capable of preventing coolant intrusion in accordance with the present invention.

<Explanation of symbols for the main parts of the drawings>

115: pressure regulating valve

120: first solenoid valve

130: pressure switch

140: second solenoid valve

150: pressure regulating valve

160: check valve

The present invention relates to a device for checking the adhesion state of the workpiece clamped to the machine, and more particularly, to a workpiece adhesion confirmation device capable of preventing coolant intrusion to prevent an error from occurring in the process of confirming the contact state of the workpiece.

In machines such as machining centers, workpieces are mounted with hydraulic clamps on fixtures on tables. In this case, if the workpiece is processed in a state where the workpiece is not in close contact with each other, a collision between the workpiece and the cutting equipment may occur, which may cause serious damage to the cutting equipment. Therefore, a device for confirming the tightness of the workpiece is required.

In other words, as shown in Figure 1, the operator puts the workpiece (W) on the jig 100 and after the automatic clamping by the hydraulic clamp is required for the workpiece adhesion check device to check whether the workpiece is properly seated.

Figure 2 shows a conventional pneumatic circuit device for confirming the close contact with the workpiece, the solenoid valve 12 for opening and closing the flow path between the pneumatic source 10 and the air discharge port 101a, the solenoid valve 12 and The pressure switch 13 which measures the pressure of the air discharge port 11 is connected to the pipeline which connects the air discharge port 11, and the pressure control valve 14 is provided in the inlet side of the solenoid valve 12. As shown in FIG.

Therefore, as shown in FIG. 2, after the work W is placed on the reference plane 101 and clamped, the solenoid valve 12 of FIG. 2 is turned on to operate the appropriate pressure adjusted by the pressure regulating valve 14 (normally). 1 bar is supplied through the check valve 15.

The air discharged from the air discharge port 101a generates back pressure by the work W in close contact with the reference plane 101. This back pressure detects that the pressure switch 13 is on, and checks whether the workpiece is properly seated. When properly seated, the solenoid valve 12 is switched off and the machining program is automatically executed.

However, in general, when the seating part of the workpiece is a non-machined surface, a coolant enters into a gap between the workpiece W and the reference plane 101 as shown in FIG. 3. Since the processing time is usually 20 minutes or more, the coolant introduced into the gap during this time will penetrate the entire air line.

   In this state, the finished workpiece is removed, the new workpiece is settled on the reference plane, and the workpiece contact device described above is operated. At this time, although the workpiece is not properly seated as shown in FIG. 4, the back pressure has already been generated by the coolant 200 inside the air line so that the pressure switch 13 of FIG. 2 is turned on. The machine then determines that the workpiece is properly seated and executes an automatic machining program.

In this case, the workpiece starts to work without the clamping itself due to the poorly seated workpiece, causing the workpiece to be dislodged by the machining force, or the workpiece and the equipment collide.

On the other hand, in the past, there have been attempts to keep the close contact solenoid valve 12 for close contact with the coolant so as not to infiltrate the coolant. If it is more than that, the close detection ability is greatly reduced.) With the pressure of about 1Bar, the recent coolant used at high pressure has a limit in preventing the penetration.

Therefore, the present invention was created in view of the above-mentioned circumstances, and prevents the coolant penetration in advance during machining of the workpiece, thereby preventing back pressure malfunction by the coolant that has previously penetrated therein, resulting in an error in confirming the adhesion of the workpiece. It is an object of the present invention to provide a device adhesion confirmation device capable of preventing coolant intrusion.

In order to achieve the above object,

In the device for confirming the close contact state of the workpiece mounted on the reference plane,

Pneumatic source;

A pressure sensing valve for controlling a pressure discharged from the pneumatic source;

A first solenoid valve for opening and closing a pipe connecting the sensing pressure control valve and the air discharge port of the reference surface;

A pressure sensing means installed in a conduit connecting the first solenoid valve and the air discharge port and switching off the first solenoid valve to block the conduit when a predetermined pressure is detected;

A second solenoid valve installed in parallel with the first solenoid valve at an inlet side of the sensing pressure regulating valve and continuously supplying air of a pneumatic source to an air discharge port when the pressure sensing means is turned on; The air blower pressure control valve for reducing the pressure of the pneumatic source to prevent the reverse flow of the coolant is further provided on the outlet side of the second solenoid valve. In addition, a check valve may be further installed at the outlet side of the air blower pressure control valve to prevent air backflow.

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Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

Figure 5 shows a pneumatic circuit for confirming the close contact state of the workpiece (W) mounted on the reference surface 101 of the jig according to the present invention, Figure 6 shows a flow chart for controlling the pneumatic circuit of FIG.

The present invention is a pneumatic source 110, a sensing pressure control valve 115 for adjusting the pressure discharged from the pneumatic source 110 as shown in FIG. The first solenoid valve 120 for opening and closing the pipe connecting the air discharge port 101a of the reference surface 101 and the first solenoid valve 120 and the air discharge port 101a are installed in a pipe connecting a predetermined pressure. When detected, the pressure switch 130 is provided as a pressure sensing means for blocking the pipeline by switching off the first solenoid valve 120.

As such, the present invention primarily configures the first pneumatic circuit to sense the mounting state of the workpiece by the pressure switch 130 to block the first solenoid valve 120.

In addition, the present invention constitutes a second pneumatic circuit which prevents intrusion of coolant into the supply line through the air discharge port 101a when the seating of the workpiece is confirmed in the first circuit.

The second pneumatic circuit includes a second solenoid valve 140 installed in parallel with the first solenoid valve 120 at the inlet side of the sensing pressure control valve 115.

Therefore, the second solenoid valve 140 continuously supplies the air of the pneumatic source 110 to the air discharge port 101a when the pressure sensing means 130 is turned on to prevent the inflow of coolant during the workpiece processing. Block it.

Preferably, a pressure control valve 150 for an air blower may be further installed on the outlet side of the second solenoid valve 140 to reduce the pressure of the pneumatic source 110. In this embodiment, the pressure control valve 150 for the air blower is set to about 2 ~ 3bar, the pressure control valve 115 for detection is set to 1bar.

On the outlet side of the air blower pressure control valve 150, a check valve 160 is provided to prevent air backflow.

The operation of this embodiment configured as described above will be described with reference to the control flowchart of FIG. 6.

First, when the clamping of the workpiece is completed, the first solenoid valve 120 is switched to the on state (S10). Therefore, the pneumatic source 11 side air air is supplied to the air discharge port 101a of the reference plane 101 through the sensing pressure control valve 115.

At this time, if the close contact between the workpiece (W) and the reference surface 101 is good, the back pressure is formed in the air discharge port (101a) side conduit and the pressure switch 130 detects this (S11). The first solenoid valve 120 is switched off (S12) and the second solenoid valve 140 is turned on (S13) by the ON sensing operation of the pressure switch 130.

Therefore, the pneumatic source 110 side air passes through the air blower pressure control valve 150 through the second solenoid valve 140 is supplied to the air discharge port (101a) (S14). At this time, the supplied air pressure is relatively 1 to 2 bar greater than the pressure supplied through the first solenoid valve 120 and continues until the process is completed.

Since the air is continuously supplied to the reference plane 101 through the air discharge port 120 during the processing in this way to prevent the reverse flow of the coolant infiltrates into the gap between the reference plane and the workpiece.

After the machining completion signal is terminated by the machining program (S15), the second solenoid valve 140 is switched to the off (off) state (S16).

As described above, the present invention confirms the close contact of the workpiece through the back pressure formed through the first pneumatic circuit, and when the check is completed, continuously generates an air blower through the second pneumatic circuit to block backflow of the coolant flowing into the circuit. This eliminates the phenomenon caused by back pressure malfunction in the next machining.

As described above, although the present invention has been described by way of limited embodiments and drawings, the present invention is not limited thereto, and the technical idea of the present invention and the following by those skilled in the art to which the present invention pertains. Of course, various modifications and variations are possible within the scope of equivalents of the claims to be described.

According to the workpiece adhesion confirmation device capable of preventing the coolant intrusion of the present invention as described above, it is possible to prevent the error of the adhesion confirmation sensor due to the back pressure due to the coolant, and to cause an accident such as equipment collision or workpiece separation due to sensor malfunction. It is possible to prevent, and the operator does not need to check whether the workpiece is closely adhered to each other, and the user's reliability can be increased by supplying a stable system.

Claims (3)

An apparatus for checking the close contact state of the workpiece (W) mounted on the reference surface 101, Pneumatic source (110); A sensing pressure control valve 115 for adjusting the pressure discharged from the pneumatic source 110 to check the state of close contact between the reference plane and the workpiece; A first solenoid valve 120 for opening / closing a pipe connecting the pressure control valve 115 and the air discharge port 101a of the reference surface 101 to confirm the state of adhesion between the reference surface and the workpiece; A pressure sensing means installed in a conduit connecting the first solenoid valve 120 and the air discharge port 101a to switch off the first solenoid valve 120 to block the conduit when a predetermined pressure is detected; It is installed in parallel with the first solenoid valve 120 at the inlet side of the pressure control valve 115 for sensing, and the air of the pneumatic source 110 to prevent the back flow of the coolant when the pressure sensing means is turned on It includes a second solenoid valve 140 for continuously supplying to the air discharge port (101a); Reducing the pressure of the pneumatic source 110 to a pressure greater than the pressure supplied through the first solenoid valve 120 to the outlet side of the second solenoid valve 140 installed in parallel with the first solenoid valve 120 Coolant intrusion prevention capable of close contact with the workpiece, characterized in that the air blower pressure control valve 150 is further installed. delete The method of claim 1, Coolant intrusion prevented close contact is characterized in that the check valve 160 for preventing air backflow is further provided on the outlet side of the pressure control valve 150 for air blower installed in parallel with the first solenoid valve 120 Confirmation device.

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