JPH0657540U - High pressure coolant fitting for turret - Google Patents

Abstract

(57) [Summary] [Purpose] To provide a high-pressure coolant joint for supplying high-pressure coolant to a tool with a coolant hole attached to a turret. [Structure] A fluid pressure cylinder is mounted on the tool rest 4 concentrically with the tool holder 6 and the tool T mounted on the turret 5 and indexed at the cutting position, a packing 23 is provided at the tip of the piston rod 11B, and a coolant supply port 13 is provided. Only when the high-pressure coolant is fed and the piston 11A is pushed out against the force of the spring 12, the cylinder side port hole 9a opens in the rear chamber, and the port hole 9b communicates with the through holes 11a and 11b. Port hole 1 communicating with the port holes 9a and 9b
With the valve member having 4a and 14b, when the coolant pressure flowing into the cylinder rear chamber rises to a predetermined pressure due to the stop of the piston movement, the port holes 9a and 9b communicate with each other and the tool T
The coolant is ejected from the hole Ta of No. Further, the retracted position of the valve rod 15 of the valve member is regulated by the adjusting screw 19 to adjust the flow rate.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a high pressure coolant supply joint for ejecting coolant from the cutting edge of a tool having a coolant hole such as a gun drill or a gun reamer mounted on a turret of a lathe.

[0002]

[Prior art]

 When using a hole drilling tool such as a gun drill or gun reamer on an NC lathe, a large amount of high pressure coolant is ejected from the cutting edge for the purpose of discharging chips, lubricating and cooling. As shown in FIG. 5, a conventional coolant joint for supplying coolant to this tool with a coolant hole is movable in the Z-axis direction on a joint body 102 fixed to a tool rest 101 and attached at any time by a spring 104 without any projection. The tool T with the coolant hole Ta attached to the turret 105 is indexed to the cutting position via the holder 106 by providing the pusher 103 to be urged, and the turret 105 is moved to engage the not shown crown gear type coupling. When the fitting 107 is pulled into the joint body side, the packing 107 at the tip of the pusher contacts the rear end surface of the holder, the pusher is pushed against the force of the spring, and the spring pressure prevents the coolant from leaking. Coolant is supplied through the center hole of 2.

[0003]

[Problems to be solved by the device]

 In the coolant joint described in the prior art, when the spring pressure is increased, a large resistance force is generated in the retracting action during turret clamping, so there is a limit in setting the spring pressure. On the other hand, recently, there is a tendency to increase the coolant pressure to improve the discharge of chips. For this reason, the spring pressure has a problem that the coolant leaks from the sealing surface and a large amount of high-pressure coolant required for machining cannot be supplied. The present invention has been made in view of the above problems of the prior art, and an object of the present invention is to provide a high pressure coolant joint for a tool post which can withstand high pressure and has a flow rate adjusting function. Is.

[0004]

[Means for Solving the Problems]

 In order to achieve the above object, the high pressure coolant joint for a tool post in the present invention is a high pressure coolant supply joint for ejecting the coolant from the cutting edge of a tool with a coolant hole such as a gun drill or gun reamer attached to a turret of a lathe. , A fluid pressure cylinder having a piston member that is always biased by a spring to be concentric with the tool mounted on the turret indexed to the cutting position, and a center hole that opens at the tip of the piston member and the center The piston member is provided with a through hole consisting of a radial hole that communicates at a right angle with the hole and opens to the outer circumference of the piston, and has a center hole at the tip of the piston member and a leak prevention seal member that abuts the rear end surface of the tool. A high-pressure coolant is supplied to the rear chamber of the fluid pressure cylinder, the piston member is pushed out, and the seal member is Those formed by providing on the outer periphery of the front Symbol fluid pressure cylinder a valve member for opening and said through hole and the rear chamber when in contact with the. It is also possible to provide means for regulating the flow rate by regulating the backward end position of the valve rod when the valve member opens the rear chamber of the fluid pressure cylinder and the through hole.

[0005]

[Action]

 When high-pressure coolant is supplied from the coolant supply port to the rear chamber of the fluid pressure cylinder, the piston moves forward against the force of the spring and the packing at the tip of the piston rod is pressed against the rear end of the tool holder and stopped. As the piston advances, one port hole on the cylinder side opens in the rear chamber and the other port hole communicates with the through hole formed in the piston and the piston rod. Then, while the piston is moving forward, the coolant pressure in the rear chamber drops momentarily, but when it stops, the coolant pressure rises to a predetermined pressure and the valve rod is retracted against the force of the spring, causing one port and the other port to communicate, and Passes through the through hole and gushes from the cutting edge of the tool. The flow rate of the ejected coolant is adjusted by regulating the retracted position of the valve stem with an adjusting screw.

[0006]

Embodiment This embodiment will be described below with reference to the drawings. In the NC lathe shown in FIG. 1, a spindle 2 is rotatably supported by a spindle headstock 1 installed on the left side of a bed (not shown), and a chuck 3 is fitted to the tip of the spindle 2 concentrically. A tool rest 4 is mounted on a bed in the Z-axis direction through a saddle (not shown) having a guide in the X-axis direction so as to be movable and positionable in the X-axis and Z-axis directions. 4 is provided with a turret 5 which can be swivel-indexed around a swivel center axis in the Z-axis direction. Tool mounting holes 5a in the Z-axis direction are formed at equal intervals on the circumference near the outer circumference of the turret 5, and the tool mounting holes 5a have coolant holes Ta through a tool holder 6 having a central hole 6a. A tool (gun drill) T is attached.

On the other hand, a high pressure coolant joint 7 is attached to a portion corresponding to the cutting index position of the turret on the outer periphery of the tool rest 4. A fluid pressure cylinder 9 is fixed to a bracket 8 of the high pressure coolant joint 7 concentrically with the tool holder 6, and the bracket 8 also serves as a rear lid of the fluid pressure cylinder 9. The piston 11A, which is integral with the piston rod 11B of the fluid pressure cylinder 9, is constantly biased toward the counter turret side by the spring 12 so that the piston 11A and the piston rod 11B are radially extended with one end open to the outer circumference of the piston. A coolant passage hole is formed by a hole 11a and a center hole 11b which is connected to the hole 11a at a right angle and is open at one end at the piston rod end.

The bracket 8 has a coolant supply port 13, and a hole 8 a that connects the supply port 13 and the rear chamber of the fluid pressure cylinder 9 is bored so that high-pressure coolant is supplied from the coolant supply port 13. Only when the piston 11A is pushed out against the force of the spring 12, the port hole 9a through which the rear chamber communicates with the cylinder outer circumference and the port hole 9b through which the semi-radial hole 11a communicates with the cylinder outer circumference are formed. It is drilled in parallel with 9. A valve body 14 having port holes 14a and 14b communicating with the port holes 9a and 9b is fixed on the outer circumference of the fluid pressure cylinder 9, and the small diameter center hole 14c of the valve body 14 has the port holes 14a and 14b. Communicate with each other at a right angle, and the valve rod 15 is fitted into the small-diameter center hole 14c so as to be movable in the axial direction. The valve rod 15 has a flange at its end, and this flange is freely inserted into the large-diameter center hole 14d of the valve body 14, so that the spring receiving cylinder 16 can move in the large-diameter center hole 14d. It has been inserted. The spring 17 stretched between the cylinder 16 and the flange of the valve rod 15 constantly urges the valve rod 15 to project freely.

Further, a lid 18 is screwed onto the end of the large-diameter center hole 14d of the valve body 14, and an adjusting screw 19 is screwed on the center of the lid 18, and the cylinder 16 is adjusted by the tip position of the adjusting screw 19. The retracted position is restricted. The valve rod 15 is pushed out to the projecting position by the spring 17, and the port hole 14a is closed in a state where the flange end face is in contact with the step end faces of the center holes 14c and 14d, and the port holes 14a and 14b are closed. Has been done. A packing holder 21 having a center hole 21a is screwed to the tip of the piston rod 11B, and a packing 23 made of a soft material such as synthetic resin is attached via a packing retainer 22.

Next, the operation of this embodiment will be described. After the tool holder 6 and the tool T are indexed to the cutting position by the turning of the turret 5, high-pressure coolant is sent from the coolant supply port 13 to the rear chamber of the fluid pressure cylinder 9, and the piston 11A and the piston rod 11B are moved. It is pushed out against the force of the spring 12, and the tip of the packing 23 is pressed against the bottom of the counterbore at the rear end of the tool holder. The movement of the piston 11A opens the port hole 9a to the rear chamber of the cylinder, and the port hole 9b communicates with the radial hole 11a of the through hole. Then, when the coolant pressure that has momentarily dropped due to the movement of the piston 11A rises to a predetermined pressure when the piston 11A is stopped, the valve rod 15 is retracted against the force of the spring 17 and the port holes 14a and 14b communicate with each other. The coolant passes through the through holes 11a and 11b, the center hole 21a of the packing holder 21, passes through the center hole 6a of the tool holder 6, and is ejected from the tip of the coolant hole Ta of the tool T. When drilling the workpiece W gripped by the chuck 3, for example, when it is desired to limit the flow rate of the coolant until a certain depth is reached, the retracted position of the valve rod 15 is controlled by the adjusting screw 19. Therefore, the flow rate can be adjusted steplessly.

[0011]

Since the present invention is configured as described above, it has the following effects. Since the packing at the tip of the piston member of the fluid pressure cylinder is pressed against the tool holder for sealing using the fluid pressure of the high pressure coolant, leakage can be eliminated and the coolant pressure can be increased with peace of mind. Also, since the coolant flow rate can be adjusted on the joint side, it is possible to adjust the flow rate at hand while observing the work condition, improving workability.

[Brief description of drawings]

FIG. 1 is a front view of a main part of an NC lathe in which a high pressure coolant joint of this embodiment is attached to a tool rest.

FIG. 2 is a sectional view of a high pressure coolant joint.

FIG. 3 is a sectional view of a valve body portion of a high pressure coolant joint.

FIG. 4 is a cross-sectional view showing a state of a high pressure coolant joint when there is no coolant pressure.

FIG. 5 is a cross-sectional view of a prior art coolant joint.

[Explanation of symbols]

4 Turret 5 Turret 6 Tool holder 7 High pressure coolant joint 9 Fluid pressure cylinder 9a, 9b, 14
a, 14b Port hole 11A Piston 11B Piston rod 11a, 11b Through hole 12 Spring 13 Coolant supply port 14 Valve body 15 Valve rod 19 Adjusting screw 23 Packing

Claims (2)

[Scope of utility model registration request] 1. A high pressure coolant supply joint for ejecting coolant from a cutting edge of a tool having a coolant hole such as a gun drill or a gun reamer attached to a turret of a lathe, the joint being attached to the turret indexed to a cutting position. A fluid pressure cylinder having a piston member that is always biased by a spring concentrically with the tool is provided, and a central hole that opens to the tip of the piston member and a radial hole that communicates at a right angle with the central hole and that opens to the outer circumference of the piston Through hole is formed in the piston member, a center hole is provided at the tip of the piston member, and a leak prevention seal member that abuts the rear end surface of the tool is provided, and high pressure coolant is supplied to the rear chamber of the fluid pressure cylinder. The piston member is pushed out, and the valve member that opens the rear chamber and the through hole when the seal member contacts the tool A high-pressure coolant joint for a tool post, which is provided on the outer circumference of a body pressure cylinder. 2. The means for regulating the flow rate by regulating the backward end position of the valve rod when the valve member opens the rear chamber of the fluid pressure cylinder and the through hole. High-pressure coolant joint for the tool post described.