CZ18793A3 - Device for release of a tool from a machining center spindle - Google Patents

Abstract

The equipment has a piston (4) equipped with a piston rod (5) in the pneumatic cylinder (1) closed by the upper flange (2). The piston rod is mounted so that it can move in the hydraulic chamber (31) of the lower flange (3). The lower flange (3) is closed by the bottom (10). The hydraulic chamber (31) is connected through a high-pressure hose (11) to the single acting hydraulic cylinder (13) mounted so that it can move on the carrier (14) which is mounted on the body of the spindle head (8) and the upper side of which is closed by a flange (12). In the single acting hydraulic cylinder (13) there is a telescopic piston (15) and a telescopic piston rod (15). The lower part of the single action hydraulic cylinder (13) is equipped with a passing flange (21). Opposite to the outside part of the telescopic piston rod (151) there is a nut (18) with a firmly connected draw bar (19) and mounted pre-stressed plate springs (20).<IMAGE>

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for releasing a tool clamped in a spindle, in particular at a machining center for machining box and plate-shaped components.

BACKGROUND OF THE INVENTION

In current machine tools, especially in machining centers for machining box and plate-shaped parts, the tool with a taper shank in the spindle is clamped by lever, ball or other clamping and is drawn into the tapered cavity of the spindle by force of pre-tensioned disc springs. The tool is released before it is replaced by a hydraulic cylinder which is connected to the headstock body of the machine, the tool being changed while the spindle is stationary. The tool release force must always be greater than the clamping force. Such force can only be achieved by hydraulic or pneumatic elements, or a combination thereof. Usually it is possible to connect it to the hydraulic power unit, which is a part of the machine and serves for controlling other machine activities. The hydraulic motor can be used to obtain the necessary power source to release the tool from the spindle. The part of the headstock to which the hydraulic cylinder is mounted must be dimensioned accordingly, which increases the weight and spatial installation of the headstock. Other known solutions utilize compressed air, but since the air pressure in the compressed air distribution is substantially lower than the pressure achieved by the hydraulic power unit and is highly fluctuating, the dimensions of these pneumatic motors are very large, which complicates the headstock design and negatively reflects on its spatial development.

2. Summary of the Invention

The above-mentioned drawbacks are eliminated by a tool release device from the spindle, in particular in machining centers consisting of a disk spring bundle of clamping mechnism, a pneumatic cylinder and a hydraulic cylinder mounted on the headstock of the machine, characterized in that it is mounted in a pneumatic cylinder. piston with piston rod. The piston rod is slidably mounted in the hydraulic chamber of the lower flange. The bottom flange is closed by the bottom. In the lower flange there is created an overflow, which is oriented in parallel with the channels - piston rods, which are connected by flow to the hydraulic chamber. The hydraulic chamber is connected by a high-pressure hose to a single-acting hydraulic cylinder, slidably mounted in a carrier, which is attached to the headstock body and is closed by a flange from the upper side. In the single-acting hydraulic cylinder there is a sliding piston with a sliding piston rod, such that the sliding piston rod extends through a flange outside the single-acting hydraulic cylinder body. At the end it is provided with a collar and a spring is inserted between the flange and the collar on the sliding piston rod. The single-acting hydraulic cylinder is provided with a through flange at the bottom and against the outside

Part of the pull-out piston rod is a nut with a rigidly attached linkage and pre-tensioned disc springs.

The advantages achieved by the tool-releasing device from the spindle according to the invention are that the device is structurally simple and flexibly compensates for pressure fluctuations in the air distribution.

At the same time, it removes the load clamped in the spindle. An advantage is also the tools clamped in the spindle by the hydraulic cylinder and therefore the hydraulic cylinder does not have to be oversized, which is reflected in its weight and spatial installation.

necessity to use a hydraulic power unit, spindle bearings when changing the tool, that the force required to release it is captured in the single acting headstock in the place of attachment favorably

BRIEF DESCRIPTION OF THE DRAWINGS

In the accompanying drawings, FIG

Fig. 2 shows a longitudinal section of the hydraulic part in a longitudinal section of a pneumatic cylinder.

An exemplary embodiment of the invention

The device for releasing the tool from the spindle 26 consists of a pneumatic cylinder X, closed from the upper side by an upper flange

2 and the lower flange 2 from the bottom side. The piston rod 5 is smaller in diameter than the piston 5. In the lower flange 2 a hydraulic chamber 31 is formed which is closed by the bottom 10 and is of the same diameter as the piston rod 5. In the lower flange 2 is a lead 32 and radial inserts 2, wherein the inlet 32 opens into a radial recess 2 and is connected to a hydraulic oil container (not shown). In the lower part of the piston rod are connected with the flow rate of the 7th chamber 22 · Hydraulic are formed by channels 51, which are into the space by a hydraulic high pressure hose 22

The flow 7 of the mouth of the chamber 31 is connected via a flange 12 to the interior of the hydraulic cylinder 13, which is slidably mounted on the headstock body S. In the single-acting cylinder 13, the piston 15 is slidably mounted with the piston rod 151. The piston rod 151 extends through a flange 12 outside of the single-acting hydraulic cylinder body 13 and is provided with a collar 2 at the end. · A spring 22 is pushed between the flange 12 and the collar 2 © on the extension piston rod. A nut 22 with a tie rod 19 attached and with pre-tensioned disc springs 20 is positioned opposite the outside of the piston rod extension 151.

The function of the device for releasing the tool from the spindle 26 is to provide conditioned compressed air above the piston of the pneumatic cylinder. Piston á. The piston rod 2 moves the hydraulic oil in the hydraulic chamber 22 at the same time. • The hydraulic oil is brought through the high pressure hose 22 above the retractable piston 15 of the single-acting hydraulic cylinder 22. the piston rod 151 moves towards the through flange 21. The piston rod 151, with its outer part, bears on the nut 18, which together with the rod 1? shifts against the force of prestressed in // disc springs' 2Ώ. towards the clamped tool even in the spindle 56. Upon reaching the lower dead center of the working path of the piston 15, the action of the linkage 19 takes place in the spindle 21 of the machine. When clamping the tool according to the invention the following. Compressed air is supplied below the piston / space between the lower flange 5 and the piston The piston 1 with the piston rod 5 returns to its starting position, the hydraulic oil pressure 51 decreases in the hydraulic chamber 51, thereby reducing the hydraulic oil pressure even in the single acting hydraulic cylinder 15. the piston 15 is returned to its original position by means of the spring 11, the nut 18 with the rod 12 and the spring springs 50 is brought back to the starting position and the swarm is again clamped in the spindle 21. In the starting position of the piston rod 5 opposite to each other, the hydraulic oil is free-flowing and the required amount of water in the hydraulic chamber 51 or the venting of the chamber 51 is replenished by the flow Z.

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okclova společnost

Claims (1)

A device for releasing a tool from a spindle, in particular in machining centers, comprising a disk spring bundle of a clamping mechanism, a pneumatic cylinder and a hydraulic cylinder disposed on the machine headstock, characterized in that in the pneumatic cylinder (1) (2) a piston (4) is mounted, the piston rod (5) of which is slidably mounted in the hydraulic chamber (31) of the lower flange (3) of the pneumatic cylinder (1) and the lower flange (3) is closed by the bottom (10); the flange (3) is a radially recessed (9) coincidently oriented (5) which are connected by flow (7) to the hydraulic chamber (31) and the hydraulic chamber (31) is connected to a single acting hydraulic cylinder (13) by a high pressure hose (115), slidably mounted in a carrier (14), which is attached to the headstock body (8) and is closed from the upper side by a flange (12), in which the piston rod inlet (32) and (51) are formed and in the barley (15) with the retractable (151) passing through - the flange (12) outside the hydraulic cylinder (13) and at the end is and between the flange (12) and the non-piston rod (151) and (13) is The extension piston is mounted so that the extension piston rod of the single-acting housing is provided with a collar (6) on the extension piston rod (151) and the spring (165) is pushed along with the single-acting hydraulic cylinder (13). the piston rod (151) is a nut (18) with a fixed link (19) and a pre-tensioned plate spring (20). "O r- 70 x> < > Ct r— ' s G tn « <r> D * —I < it -J- O it