SU1404190A1 - Clamping chuck for securing end tools - Google Patents

Abstract

The invention relates to the processing of metals by cutting and can be used to fasten tools such as drills and countersinks when machining for drilling and other mills.

Description

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kah. The aim of the invention is to reduce the size and increase the rigidity of the tool. To fasten the axial tool, the device comprises a housing 1, on the end of which in the apertures 2 by means of dilindrical daps 5 are installed rotatably in a plane perpendicular to the axis of the cartridge, clamping cams 6. On the cams there is an outer conical and cylindrical surface. On the housing 1 a nut 11 is installed with an inner conical surface, to which the cams are pressed by means of springs. As the nut rotates, the cams rotate and, in contact with the tool shank, with an internal remote surface along the line, clamp it. 3 hp f-ly, 4 ill.

one .

The invention relates to metal cutting and can be used to clamp tools such as drills, countersinks, etc. when processing on drilling and other machines.

The purpose of the invention is to reduce the size and increase the rigidity of the tool attachment due to the optimal shape of the clamping jaws and their connection with the body of the chuck.

Figure 1 shows the cartridge, General view, with a partial longitudinal section; FIG. 2 is a view A of FIG. one; on fig.Z - details of the cartridge, isometric; figure 4 - the same option.

The clamping chuck for fastening the axial tool contains a cylindrical body 1 with an axial bore

2in its front end and shank

3d fastening in the machine spindle.

At the end of the body of the cartridge, three evenly spaced circumferentially and parallel to the axis of the body are cylindrical bores 4, in which the clamping cams 6 are rotatably mounted by means of pins 5.

Clamping jaws have the form defined by part 7 of the outer conical surface, part 8 of the inner cylindrical front, the axis of which coincides with the axis of the body when the cam surface divides by the maximum lock diameter and intersects with the indicated surfaces a flat surface 9 located parallel to the axis of the trunnion 5 and forming when crossing with part 8 of the inner cylindrical surface an edge 10 located from the axis of the trunnion 15 at a distance greater than the radius of the circle on which the centers are located ilindricheskih rasto- check 4 on the side of the case.

On the outer thread of the housing there is a nut 11 with an inner conical surface 12, a mating conical surface on the cams 6.

0 In the annular groove 13, formed on the outer surface of the housing, an annular spring 14 is installed, which is designed to interact with end-shaped arc-shaped protrusions 15, which are made on pins 5.

In another embodiment, the clamping jaws of the cartridge may have the shape defined by the part 7 of the outer conical surface, flat

0 by a surface 9 and a flat surface 16 located in a plane passing through the edge 10 with respect to the circumference of a diameter equal to the maximum diameter of the cylindrical shank of the tool.

The pressing of the cams to the inner conical surface of the nut can be carried out by means of torsion springs 17 installed in an annular

0 the groove 18 on the trunnion 5. In this case, one end 19 of the spring is placed in the groove 20 on the trunnion, and the other end 21 in the annular groove 22, made at the end of the body.

5 The cartridge can be equipped with a sleeve 23 mounted on the outer surface of the housing with an external thread 24 and a radial threaded hole 25 in which a two-stage roller 26 is installed. It is eccentrically located

step 27 of the roller is installed in the radial hole 28, made in the housing. The nut 11 in this embodiment of the cartridge is mounted on the thread 24 of the sleeve 23. A multifaceted key-hole 29 is made at the end of the roller.

Under the action of the spring 14 or 17, the cams 6 rotate and contact part 7 of the outer conical surface along a line with the inner conical surface 12 of the nut 11. As the nut rotates on either side, the cams approach or diverge in contact with part 8 of the inner cylindrical surface along the line straight shank tool.

The force transmitted by the nut to the cams is used to clamp the tool, the maximum diameter of the shank of which can be equal to the diameter of the cylindrical hole formed by the parts 8 with the full-width position of the cams.

In another version of the chuck position, the cams approach and spread out by means of a nut 11, and the clamp is clamped 26. Sleeve 23, moving together with the nut along the axis of the body, transmits the force developed by the eccentric roller step 27 to the nut, and the last cams.

The clamping jaws, made in another embodiment, are in contact with the tool shank along a line with flat surfaces 16.

The geometrical axis of the cam conic surface 7 is parallel to the axle axis, and therefore to the edge 10, which is parallel to the cartridge axis, therefore, in the process of clamping the cutting tool shank, regardless of the cam position within the angle of rotation relative to the housing, linear contact of the 7 conical parts is provided cam and nut surfaces. For the same reasons, the contact part 8 of the inner cylindrical surface on the cams or part 16 with the tool shank is also linear.

In this case, it is necessary that the distance of the edge 10 from the axle axis exceeds the radius of the circle on which the cylindrical bores in the housing are located.

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Claims (4)

1. A clamping cartridge for fastening an axial tool, comprising a cylindrical body with an axial bore, clamping cams associated with the body can be rotated in a plane perpendicular to its axis, and means for rotating the cams and transmitting force when clamping and unclamping a tool that has so that, in order to reduce overall dimensions and increase rigidity, the cams are connected to the casing by means of trunnions mounted on them, mounted on cylindrical bores made on the crown face, while the cams are formed by part an outer conical surface, a part of the inner cylindrical surface, the axis of which coincides with the axis of the housing when the cam positions are divorced by the maximum clamping diameter and intersecting with said surfaces. a flat surface parallel to the axle axis and forming an edge at the intersection with a part of the inner cylindrical surface located at an distance from the axle axis exceeding the radius of the circle on which the centers of the cylindrical bores on the body end are located; the clamping and unclamping are made in the form of a nut with an inner conical surface, a mating conical surface of the cams, and a flange mounted on an external thread made on the body between the body and the pins of the cams of the elastic element, designed to rotate the cams in the direction of their unclamping. 2. A cartridge according to claim 1, of tl and h aa y and with the fact that the elastic element is made in the form of an annular spring located in an annular groove made on the outer cylindrical surface of the housing, with the possibility of interacting with axle cams end arched protrusions. 3. The cartridge according to claim 1, characterized in that the elastic element is made as separate torsion springs, each of which is installed in an annular groove made on a trunnion, with one end of the spring placed in a longitudinal groove made on the trunnion, and the other in an annular groove made at the end of the body and intersecting with cylindrical bores, 4. Cartridge on PP. 1 - 3, about the tol and- Chas with the fact that it is provided with 5fceH mounted on the outer surface of the housing with a sleeve with an outer Type A 2 a threaded and radial threaded hole and a two-stage roller installed in the indicated hole, eccentrically located a step of which is installed in a radial hole made in the housing, also a nut is installed on the sleeve thread, and a multifaceted key hole is made at the end of the threaded step of the roller. / 2 28 Figm