JPS6158262B2 - - Google Patents

Description

[Detailed description of the invention] Conventionally, as disclosed in Japanese Utility Model Application Publication No. 52-161582 and Japanese Patent Application Publication No. 50-53972, there is a method of assembling a heat pipe to the main shaft bearing part and extracting the heat generated by the bearing to the outside, and a method of removing heat exposed to the outside. It is designed to cool the fins of the pipe. Also, as in Utility Model Publication No. 52-20072, the bearings on the main shaft are cooled by passing air through a passage using the fan of the main shaft. However, neither of these methods has a sufficient cooling effect.

The present invention relates to a temperature rise prevention device for a rotary valve used, for example, in a power chuck of a turning machine tool. In general, turning machine tools often use a fluid pressure cylinder as the drive source for a power chuck attached to the tip of the main spindle. In order to supply fluid to this rotating cylinder, it is necessary to use a rotary valve configured with a bearing interposed between the stationary side and the rotating side. However, leaked oil that also serves as lubrication for a portion of the fluid supplied to the rotary valve passes between the stationary side and the rotating side, passes through the bearing, and is collected from the external drain. However, when the fluid passes through the bearing, it is agitated and generates high heat. This high heat is propagated to the main shaft of the machine tool, accelerates the temperature rise of the main shaft, and causes thermal displacement.
Thermal displacement of the main shaft changes over time and appears as variations in cylindricity and dimensions.

The present invention incorporates a heat pipe into the cylinder of the rotary valve at the rear end of the main shaft, extracts the heat generated by the rotary valve to the outside, and allows the air to circulate through the spiral blades and side plates of each of the heat pipes exposed to the outside. This is a temperature rise prevention device that forcibly cools the fins in the flow by the air flow created by the fan by placing the fan in the airway and rotating the fan and the heat pipe together. .

Embodiments of the temperature rise prevention device for a rotary valve according to the present invention will be described in detail below with reference to the drawings.

In FIG. 1, a main shaft 1 is rotatably provided on a headstock 2 via bearings 3 and 4.
A gripping device 5 (hereinafter referred to as chuck body) is attached to the tip of the main shaft 1. A master jaw 6 is slidably provided in the radial guide groove of the chuck body 5. A cylinder 8 is integrally fixed to the rear end of the main shaft 1 via an adapter 7. A piston rod 9 is slidably inserted into the chamber of the cylinder 8, forming a chamber 8A and a chamber 8B. Further, a fixing member 12 is provided at the rear of the cylinder 8 via bearings 10 and 11. On the outer periphery of the fixing member 12,
Two pipes 12A and 12B are attached at one end. The other end of the pipe is connected to the tank pump via a switching valve 15. At positions corresponding to the pipes 12A and 12B of the fixing member 12, oil passages 1 are provided.
1A and 11B are drilled. This oil passage 11
A, 11B are grooves 1 on the inside of the fixing member 12.
It communicates with 3A and 13B. The cylinder 8 is separately provided with oil passages 14A and 14B whose one ends communicate with the cylinder chambers 8A and 8B, respectively, and whose other ends are connected to the grooves 13A and 13B. Therefore, by switching the valve 15, pressure oil is guided to the cylinder chamber 8A side, or pressure oil is guided to the cylinder chamber 8B side, and the piston rod 9 is moved from side to side. The chuck side of the piston rod 9 is screwed into a connecting rod 16 passing through the through hole 1A of the main shaft 1. The front side of the connecting rod 16 is provided with an actuator 17 (hereinafter referred to as a cam member) slidably provided on the chuck body 5.
and are fixed with screws 18. A cam 6A of the master jaw 6 is slidably inserted into the cam groove 17A of the cam member 17.

A heat pipe 19 is inserted into the fixing member 12 near the oil passages 11A and 11B, and the fins 19A of the heat pipe are exposed toward the rear of the cylinder 8. Further, a spiral fan 20 is attached to the rear of the cylinder 8.

As mentioned above, as the piston rod 9 moves in the direction of the main shaft axis, the connecting rod 16 and the cam member 17 are similarly driven, and the master jaw 6 is moved in the radial direction of the chuck. Grip the workpiece W. In this state, the oil leaking from the grooves 13A and 13B is removed from the bearing 1.
It flows out from both sides of 0 and 11 and is collected from the drain 21. In the state shown in FIG. 1, the main shaft 1 rotates, and the workpiece W is machined as the tool moves. As the main shaft rotates, the cylinder 8 also rotates, and the oil leaking from the grooves 13A and 13B is agitated at the bearings 10 and 11, and its temperature increases. As the oil temperature rises, the temperature of the fixing member 12 and the rear part of the cylinder also rises. However, since the heat pipe 19 is built in near this temperature generating part, heat is taken out from one end of the built-in part of the heat pipe 19 to the exposed fin part 19A. This fin portion 19A is cooled by blowing air in the direction of the arrow with a fan 20 behind the main shaft. The air blowing arrow is convenient for exhausting hot air out of the machine body through the hole in the rear cover of the spindle of a turning machine, etc., and also has the effect of lowering the temperature of the spindle head covered with the cover. The configurations of the fan 20 and the fin 19A will be described in detail based on FIGS. 1 and 2.

Heat pipe 19 at the rear of cylinder 8 at the rear end of the main shaft
are inserted in the direction of the main shaft axis, and attached so that the other fin portion 19A is exposed. Further, a fan 20 is attached to the base of the fin portion 19A. Therefore, the rotation of the main shaft 1 and the cylinder 8 generates a flow of air by itself for cooling. Also, the feather 20A of Juan 20 is
They are arranged alternately with the fins 19A in between.
As shown in FIG. 2, the wing 20A forms an air flow path with the spiral wing 20A and the side plate, exposes the fin portion of the heat pipe in this air flow path to form the fan 20, and rotates the fan 20. Then, the wind flows from the inside to the outside as shown by the arrow. That is, each of the spiral blades 20A and a side plate is arranged in an air flow path to form a fan, and the fan and the heat pipe are rotated together to cause the fan to generate a forced flow of air. Cooling. That is, air is sucked in from the rear side plate and air is discharged radially outward. The fins are cooled by the forced flow of air during such rotation.

As stated above, the present invention is not limited to the configurations shown in the examples, and modifications are expected without departing from the technical idea of the present invention as described in the claims. .

[Brief explanation of the drawing]

FIG. 1 shows a sectional view of the main axis of a turning machine tool.
FIG. 2 shows a view taken along arrow C in FIG. In the figure, 1...Main shaft, 5...Chuck body, 6...Master jaw, 8...Cylinder, 8
A, 8B...chamber, 9...piston rod, 10,
11...Bearing, 12...Fixing member, 13A, 13
B... Groove, 14A, 14B... Oil path, 15... Valve, 16... Connecting rod, 19... Heat pipe,
19A... Huynh, 20... Juan, 21...
Drain, 22...annular cylinder, 22A...lid.

Claims (1)

[Claims] 1. A main shaft rotatably provided on a headstock, a gripping device attached to the tip of the main shaft, an actuator that operates within the gripping device, and a gripping device driving cylinder provided at the rear end of the main shaft. , a piston rod movable in the main axis direction within the driving cylinder;
a connecting rod that connects one end to the tip of the piston rod and the other to the actuator; a fixing member for a rotary valve supported behind the piston rod via a bearing concentric with the main shaft; A heat pipe is inserted from the rear in the direction of the main shaft axis and has fins exposed at the rear, and a fan is attached to the rear end of the cylinder, each of the fins of the heat pipe forming an air flow path with a spirally curved blade and a side plate. This is a rotary valve in which air is sucked in from the center of the fan by the rotation of the fan when the main shaft rotates, and air is discharged in a radial direction, creating a flow of air that cools the fins in the flow path. Temperature rise prevention device.