CS265322B1 - Chuck Jaw Turning Device - Google Patents

Abstract

The solution concerns a device for turning the jaws of chucks, where its physical and spatial arrangement is solved. The essence of the solution is that between the front surface of the jaw of the working chuck and the pressing means, a locking body is inserted symmetrically to the axis of rotation, which is provided on the side adjacent to the front flat jaw with at least one front locking protrusion, which is in engagement with the front surface of the jaw and on the side remote from the front flat jaw is in axial engagement with the pressing means. The device for turning the jaws of chucks, by the same arrangement with a minimum number of locking elements, enables the jaw to be turned in a pre-positioned state in any radial position of the jaw and does not increase its dead height. The turning device enables the turning operations to be automated and uses the devices that the machine itself has at its disposal.

Description

265322 2

BACKGROUND OF THE INVENTION The present invention relates to a device for rotating jaws of chucks, where its body and spatial arrangement are addressed.

In order to avoid inaccuracies in the assembly of the chuck on the machine spindle for working accuracy, the chuck jaws are now rotated under retraction. Various locking rings are used most often, which are clamped in the chuck jaws radially at the points of the non-clamping plates and in this state the clamping surfaces of the jaw are machined. A disadvantage of these solutions is that in the case of adjusting the clamping jaws, a plurality of locking rings of different diameters must be used, thereby extending the assortment and the number of components required to accommodate the jaws on the clamping task. In addition, the locking rings have a certain ridge, guaranteeing the transfer of the necessary clamping forces necessary to define in the force mechanism of the chuck and thereby losing a certain length of jaw beyond which it cannot clamp. This increases the weight of the jaws as a result of which known problems with decreasing the clamping forces occur during rotation. Blocking the glue chucks in their preparation for internal clamping is currently unreliable. Various locking bodies are used, the outer diameter of which extends substantially beyond the diameter of the chuck, which in the case of clamping large diameters of the workpieces creates a collision situation with the support, the tool, or the boxes of the machine and does not allow the jaws to rotate at all. The spinning rings are usually placed between the future clamping surface and the chuck face, so that larger clamping forces are required to eliminate play in the tilting guide of the body. Kneading bodies with interchangeable inserts for blocking different diameters of the jaws are still known, but are rather rigid and complicated, and handling is inconvenient.

The above-mentioned drawbacks are alleviated by the chuck turning device according to the invention, wherein the locking body is interposed symmetrically to the axis between the face of the working chuck jaw and the pressing device, and which is provided on the adjacent flat face jaw with at least one front locking projection which is in engagement with the face of the jaw and on the remote side to the front jaw, the pressing means is axially engaged. Through the chuck jaws, the entire clamping length of the tool jaw becomes accessible. Further, the dead height of the jaw is removed, thereby reducing its weight and favorably affecting the clamping force during machining. The number of locking elements is reduced and the clearance in the power mechanism is defined in any position of the clamping jaws. The constructional diameter of the locking body does not cause a collision with the machine boxes when the maximum clamping diameters of the jaws are rotated. The jaw spinning device is simple and allows you to automate this process, so it can be used mainly in modern technology workplaces.

It will allow the jaws to be locked without modification in the adhering directions of clamping, and on the same flat, which is at the same time farthest from the jaw guide of the jaws in the chuck body, and can override all the clearances in the chuck force mechanism.

FIG. 1 shows a partial side view of the arrangement of the machine, FIG. 2 shows another example of the solution also in partial side view, and FIG. 3 shows an example of the arrangement of the machine on the machine. counter-spindles in a side view, where both chucks are used to rewind.

The chuck rotating device consists of a machine tool 100 with a rotary spindle attached to the working chuck 110 with the jaws 111, of the pressing means 120, which according to FIGS. 1, 2, 3 is designed as a movable headstock of a double-spindle lathe. However, it may also be provided by a tailstock, a support, or a manipulator of a technological workplace capable of exerting axial force in the direction of the arrow c parallel to the rotation of the working chuck 110. The apparatus further comprises an interlocking body 121 of an intermediate jaw 111, a pressing means 120 and a tool 130 (not shown). of the machine tool 100. In the example shown in FIG. 1, the locking body 121, as a cylindrical disc, is on its adjacent face 121a to the front face 11a of the workpiece

Claims (4)

3, 265322 of a chuck 110 provided with at least one locking protrusion 121b, e.g., in the form of hardened reinforced pins, for each end 111b. The blocking body 121 with its distinctive locking projections 121b can replace the known jaw of a spiral barrel implemented in FIG. 2 as a separate locking chuck 120a and in FIG. 3 a second of the chucks of a known twin-spindle machine 100. known methods, for example by automatically exchanging the face according to AO 200 326 as its special face. The process of spinning the soft jaws of the chuck 110 is as follows: With the known movement mechanism of the working chuck 110, its jaws 111 move to a radial position corresponding, for example, to a half of the power stroke. In this field, the movement mechanism is locked with any of the known methods, such as the known hydraulic switchgear operated by a contactless microswitch, which senses the position of the piston rod of the control motor coupled to said movement mechanism. Thereafter, in a known manner, the second chuck of the machine 100 is clamped in a manner known per se on the adjacent side 121d to the jaw 111, and the front-locking projections 121b on the adjacent side 121a of the locking body 121 are facing the front face of the jaw 111 by an axial movement of the pressing means 120 in the direction of the arrow e. the working chuck 110 performs an additional hardening motion of the jaws 111 to the axis O, thereby defining the movement in the moving mechanism and the jaw 111 tilting in a direction corresponding to the clamping behind the inside. In the footer, the clamping surface 111b of the jaw 111b can be rotated through the tool 130 by rotation n. After the clamping surface has been overturned, the working space of the machine 100 is released in the reverse order and workpieces can be clamped in a known manner. The strengthening movement of the jaw 111 from or towards the axis o can be carried out without additional movement by the working mechanism of the working chuck 110, for example, in that the front locking tabs 121b are arranged on the adjacent side 121a of the locking body 121 in a spiral direction, e.g. The working chute 110 in the desired direction of rotation of the jaws 111 in the desired direction of the jaw 111 is formed by the jaw 111 in the force mechanism in the desired direction. The jaw 111 is preferably made using the second chuck mechanism of the machine 100 as shown in FIG. 3. In this case, however, the known chuck is replaced by the locking body 121 as a special jaw, for example, by automatic exchange from the front. After pressing the front locking projections 121b into the face face of the score jaw 111 as described above, the centripetal movement of the locking bodies 121 ' in the synchronous rotation of the two spindles of the machine 100. In the example shown in FIG. 2, the special chuck 120a with a special clamping device 120a is clamped in the second chuck of the two-spindle machine 100 or can be applied to it from the sheet 121d, for example, by a known tailstock in the direction of the arrows e. A chuck jaw rotating device comprising a machine tool on which the chuck is a chuck with a jaw and a jaw turning tool characterized in that it is symmetrical to the jaw face (111) of the working chuck (110) and the pressing device (120) a blocking body (121) interposed on the axis of rotation (o), which is provided on the adjacent side (121a) to the front face (111a) of the jaw (111) with at least one face locking projection (121b) which engages the jaw face (11a) 111) and on the remote side (121d) to the front face (111a) of the jaw (111) is axially engaged with the pressing means (120). A jaw spinning device according to claim 1, characterized in that the front locking jaw (121b) is a tip-shaped. 265322 4 Jaw reversing device according to claim 1 or 2, characterized in that the front locking projections (121b) are arranged in a spiral. A jaw turning device according to any one of items 1 to 3, characterized in that the fin body (121) is a jaw of the blocking chuck (120a). 1 drawing