JPS63300840A - Clamp cylinder - Google Patents

Abstract

PURPOSE:To improve the working efficiency by providing a stepped cylinder whose center part forms a large diameter part and the both sides form the small diameter parts and by providing a stepped piston having a piston which is fitted onto the stepped cylinder and onto which a clamp body is installed. CONSTITUTION:When a turret 2 in the clamped state is supplied with a dividing instruction, pressurized oil is sent into a chamber 4b2 in the rear side small diameter part of a clamp cylinder 4 from an oil passage 24 and also sent into the front chamber 11b of a positioning cylinder 11. Then, a knock 13 is released, and a piston 5 is moved leftward. Further, a pilot check valve 17 is opened, and the oil in the chamber 4a1 in the front side large diameter part is sent into the chamber 4a2 of the rear side large diameter part, and the oil in the chamber 4b1 in the front side small diameter part is discharged through a check valve 18, and the engagement between the cubic couplings 10a and 10b is disengaged. Thus, the high speed turn of the turret 2 is permitted. Further, in the clamping operation, the large and small diameter parts on the side where a large force is necessary are allowed to communicate at the clamping time point, and a large force can be obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a lamp cylinder suitable for use in indexing and clamping members of machinery.

In the turret of a talent tool rest of a conventional machine tool such as a lathe, the necessary tools are determined in accordance with the machining process.

During this indexing, the turret is lifted up from the tool post body by hydraulic pressure, disengages the car pick coupling, and rotates. At the indexing position, the turret is retracted and engages the car pick coupling again, causing the turret to engage. Clamped to the main body. A piston cylinder mechanism is used for this operation.

Problems to be solved by the invention As powerful cutting or large tools are often used, the clamping force of the turret needs to be correspondingly strong. Ta. As described above, when the diameter of the cylinder becomes large, the volume becomes large, and the time required for the reciprocating movement of the turret becomes long, which deteriorates work efficiency.

Means for Solving the Problems A stepped cylinder 4 with a large diameter section 4a at the center and small diameter sections on both sides, and fittings into the large diameter section 4a and small diameter sections 4bI and 4b1 on both sides of the stepped cylinder 4, respectively. and a valve member that opens and closes a flow path 20.21 that communicates the stepped piston 5 having the piston rod 3 to which the clamp body is attached, and the large diameter chambers 4a1 and 4a2 divided on both sides by the stepped piston 5. 17.47, and a flow path 5C that connects the large diameter chamber 4a+ and the small diameter chamber 4b of the stepped cylinder 4 in the clamping direction near the end of the piston movement in the clamping direction. It includes a clivia throttle valve 19 that throttles the discharge passage 26 of the large diameter chamber 4a on the opposite side of the large diameter chamber 4a!.

Embodiments Hereinafter, embodiments of the present invention will be described based on the drawings, and a turret tool rest of a lathe will be explained as an example.

A turret 2 is horizontally supported on a tool rest 1 by a pivot shaft 3 so as to be movable in the direction of the pivot shaft. The large diameter part 4a at the center of the stepped cylinder 4 for clamping, the large diameter parts 51 fitted into the small diameter parts of the same diameter on both sides thereof, and the small diameter parts 5bx on both sides thereof.
A piston 5 having a diameter of 5 bt is formed concentrically with the pivot shaft 3, and a front small diameter portion 5b+ connects a large diameter portion chamber 4a1 and a small diameter portion chamber 4b of the cylinder near the end of rightward movement of the piston. A communicating notch 5C is cut in the direction of the outer circumferential axis. The rotation shaft 3 is equipped with an indexing disc 6° with a notch cut on its circumference corresponding to the indexing angle of the turret, a gear 7 for rotating the turret, and an indexing angle detector 8 at the rear end. A dock 9 is provided. In addition, a car pick coupling 1Oa is installed concentrically on the back of the turret 2, and a car pick coupling 10a on the opposite side of the turret 1 side is mounted on the opposite side of the turret 1.
b are fixed concentrically. Furthermore, the piston 1 is fitted into a cylinder 11 for positioning in a direction perpendicular to the index disk 6.
The end of the piston rod 2 is a positioning notch 13, which is inserted into a notch in the disc 6 to determine the rough position. The turret rotation gear 7 is connected to the hydraulic motor 1 via an intermediate gear 14.
5, the tongs 9 confirm the clamping of the car pick couplings 10a, 10b with the proximity switch 16.

The large diameter portion 4a of the stepped cylinder 4 for clamping is divided by the large diameter portion 5a of the piston 5 into a front large diameter chamber 4al and a rear large diameter chamber 4a, and both chambers are connected to a pilot check valve 17. The oil passages 20 and 21 communicate with each other. The biloft pressure of the pyro-7 check valve 17 is taken from a chamber 4b8 in the rear small diameter portion of the cylinder 4, which will be described later. In addition, the chamber 4b in the small diameter portion on the front side of the clamp cylinder has a flow path 22.
The rear chamber 11 is communicated with the rear chamber 11a of the cylinder 11 by
The oil passage 23 of a is connected to the check valve 42 via the 2-position switching solenoid valve 41.
connected to the pressure side or discharge side via. Also, the chamber 4bx in the small diameter part on the rear side of the stepped cylinder for clamping is the oil passage 2.
4 by two-position switching solenoid valve 41. It is connected to the pressure side or the discharge side via a check valve 42. The oil passage 22 of the chamber 4b+ in the front small diameter portion and the oil passage 23 of the cylinder 11 are communicated by an oil passage 25 in which a check valve 1B for cranking is inserted, and the oil passage 22 is closed by the piston 12. It has become a side road. Also, chamber 4 of the large diameter part on the rear side
An 8x oil passage 21 is connected to the discharge side by an oil passage 26 via a temperature-compensated flow rate restricting valve 19 for use when clamping. Also, the front chamber 11b of the cylinder 11 is connected to the oil passage 2.
7 to the flow path 24.

The oil passages 28 and 29 of the hydraulic motor 15 are connected to the 3-position switching solenoid valve 4.
3. On the pressure side via a check valve 42 and a temperature compensated flow restrictor 44 . It is connected to the discharge side via a check valve 42. and a bypass circuit 30 for the flow restrictor valve 44.
are the temperature compensated flow rate restrictor 45 and the swing speed high/low switching valve 46.
This enables high-speed and low-speed turning.

Assume that the talleft 2, which is in the active clamp state, is commanded to index. Switching solenoid valve 4 for unclamping the turret 2
1 is switched to the ■ position, and pressure oil is sent from the oil passage 24 to the chamber 4bz of the rear small diameter portion of the clamp cylinder 4 and also to the front chamber 11b of the positioning cylinder 11. As a result, the notch 13 is removed and the piston 5 is moved to the left in FIG.

The oil pressure in the chamber 4bg of the rear small diameter section opens the pilot check valve 17 as pilot pressure, and the leftward movement of the piston pushes out the oil in the chamber 4a+ of the front large diameter section and sends it into the chamber 48t of the rear large diameter section. The oil in the chamber 4bt of the front small diameter portion opens the check valve 18 from the oil passage 22, 25, and is discharged from the oil passage 23 through the check valve 42 (Fig. 2), and the oil is discharged from the oil passage 23 through the check valve 42 (Fig. is removed.

Next, the switching solenoid valve 43 is switched from the neutral position (■) to the ■ (or ■) position, which is a shortcut direction, and the switching solenoid valve 46 is switched to the 1 position, and the pressure oil is transferred from the flow path 28 to the hydraulic motor 15.
intermediate gear 14. The tower shaft 2 is rotated at high speed together with the rotation shaft 3 via the gear 7, and the switching solenoid valve 43 is set to the position (2) by the index signal from the angle detector 80. During this time, the height switching valve 4
6 is set to the ■ position, and the return oil of the hydraulic motor 15 passes through the flow rate restricting valve 44, whereby the taleft 2 is decelerated.

The switching solenoid valve 41 is switched to the 1 position, and the pressure oil flows through the flow path 23.
The oil is sent to the rear chamber 11a of the cylinder 11, moves the piston 12 forward to fit the notch 13 into the indexing plate 6, and is further sent through the oil passage 22 into the chamber 4b+ of the small diameter portion on the front side.

When the piston 5 moves to the right (Fig. 3), the chamber 4b of the small diameter part on the rear side,
The oil in the chamber 4ag of the rear large diameter section is discharged from the oil passage 24, and the oil in the chamber 4ag of the rear large diameter section is sent from the oil passage 21 through the biloft check valve 17 to the chamber 4a of the front large diameter section. The oil sent to the front small-diameter chamber 4b by the notch 5c before the end of the rightward movement of the piston 5 is also sent to the front large-diameter chamber 4a, and closes the pilot check valve 17. Therefore, the chamber 4al of the rear large diameter part
The oil is in oil line 26. Flow restrictor 19 for Clamp Clivia
It is discharged through the process and is subjected to the action of kutsushiran during clamping (Fig. 4).

The curvic couplings 10a and 10b have a chamber 4a at the front large diameter section and a chamber 4b at the front small diameter section.

They are engaged and clamped with strong force by hydraulic pressure acting on a wide area. The switching solenoid valve 43, to which the clamp confirmation signal is output from the proximity switch 16, is in the ■ position.

Embodiment 2 In Fig. 5, the pilot check valve 17 is replaced with a switching solenoid valve 47 that switches between on and off. Room 4a
, and at the same time that the pilot check valve 17 opens when it is necessary to establish communication between the two, the circuit is opened by a command. This effect is the same as described above. Note that the switching valve 47 is not limited and can be used as long as it has the same function.

effect As detailed above, the present invention rotates the taleft and the like.

Since the hydraulic cylinder and piston for indexing and clamping are stepped with small diameter parts on both sides of the large diameter part, pressure oil can be sent to the small diameter part for rapid movement. In addition, the large-diameter part and small-diameter part on the side that requires a large force, such as when clamping, are communicated at the time of clamping, so that pressure oil can be applied to the entire area of the cylinder and large forces cannot be applied. This has the effect of making it possible to easily obtain rapid movement and strong clamping without changing the capacity of the pressure oil pump.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram of the clamp cylinder of the present invention combined with a talent tool post, Fig. 2 is a diagram showing the state of the cylinder at the start of unclamping, and Fig. 3 is a diagram showing the state of the cylinder at the start of clamping. 4 is a state diagram of the cylinder during clamping, and FIG. 5 is an explanatory diagram showing another embodiment of the on/off valve for the chamber in the large diameter portion of the cylinder. 2...Talleft 3...Swivel shaft 4...Clamp cylinder 4a+, 48g...Large diameter chamber 4b1.4bg...Small diameter chamber 5...Piston 5
a...Large diameter part sb,,5b,...Small diameter part 17...
Viloft check valve 18... Check valve 19... Throttle valve 47... Switching solenoid valve No. 5'rl! J

Claims (5)

[Claims] (1) A stepped cylinder having a large diameter part in the center and small diameter parts on both sides, and a stepped cylinder having a piston rod that fits into the large diameter part and the small diameter parts on both sides of the stepped cylinder and has a clamp body attached thereto. a piston, a valve member that opens and closes a flow path that communicates the large-diameter chamber divided into both sides by the stepped piston, and a large-diameter chamber and a small-diameter chamber in the clamp action direction of the stepped cylinder; and a cushion throttle valve that throttles the discharge flow path of the large-diameter chamber on the opposite side of the large-diameter chamber that communicates with the small-diameter chamber from near the end of piston movement in the clamping direction. A clamp cylinder characterized in that pressurized oil is sent rapidly to a chamber in the section, and clamping is performed by the area of a chamber in a small diameter section and a chamber in a large diameter section. (2) The clamp cylinder according to claim 1, wherein the valve member is a pilot check valve. (3) The clamp cylinder according to claim 1, wherein the valve member is a solenoid valve that selects opening and closing. (4) The clamp cylinder according to any one of claims 1, 2, and 3, wherein the small diameter portions of the stepped cylinders have the same diameter. (5) The clamp cylinder according to any one of claims 1 to 4, wherein the flow path to be communicated is a notch groove formed in the small diameter portion of the piston.