SU904906A2 - Collet chuck - Google Patents

Description

(54) TSANGOVYY CARTRIDGE

one

The invention relates to metalworking and can be used when securing blanks on lathes.

According to the main author. St. No. 566680 is known for a collet chuck containing a movable outer collet mating with a conical spindle bore, an intermediate collet under the influence of an elastic element, and an additional cylindrical collet 1.

However, with this design, an axial displacement of the workpiece occurs when it is fixed.

The aim of the invention is to increase the fixing accuracy.

The goal is achieved by the fact that a protrusion is formed on the inner surface of the intermediate collet, and a groove is formed on the outer surface of the additional cylindrical collet, designed to interact with said protrusion.

FIG. 1 schematically shows the proposed cartridge, a general view; in fig. 2 shows section A-A in FIG. one; in fig. 3 shows a section BB in FIG. one; in fig. 4 shows a section B-B in FIG. 3; in fig. 5 is a view of FIG. four.

The collet chuck consists mainly of an outer collet 1, an additional cylindrical collet 2 and an intermediate collet 3 placed inside the pinch 4 and the body 5 attached to it (Fig. 1). The cylindrical collet 2 has a conical head cooperating with the bore of the housing 5, a nut 6-it is connected to the clamping tube 7. In the outer collet 1 there are longitudinal slots to make it elastic and to hold the petals of the intermediate collet 3, on the outer collet T 1 a groove mated to a pin 8 mounted in the housing 5. Inside the outer collet 1 there is a cyan collet 2, having two located along

15 edges of the working area with internal and external surfaces. Internally, it is in contact with the workpiece 9, one of the outer - with a hole in the outer collet 1. Elasticity of the cylindrical collet 2

2Q are attached to the two long ends of the closed longitudinal slits (Fig. 2), offset by an angle relative to each other by an equal amount. On the front outer surface of the cylindrical collet 2, there is a groove, the end portions of which are mated with a corresponding inner protrusion 10 of the intermediate collet 3. The latter is formed by completely cutting the collet and consists of individual petals according to the number of slots of the outer collet 1 (Fig. 3). At one end of the intermediate collet 3, there is a conical surface, with which it interacts with the pressure sleeve 11, the inner cylindrical surface of the intermediate collet 3 mates with the cylindrical collet 2. At the opposite end, the intermediate collet 3 has a collar for abutment against the end of the body 5 and two conical surfaces - one for centering along the conical opening of the housing 5, and the other for pressing with a nut 12 screwed on the housing 5. In the housing 5 on the cylindrical protrusion located to the right (as shown in FIG. 1) The grooves widthwise correspond to the thickness of the petals of the intermediate collet 3. Thus, the latter are prevented from turning when the nut 12 is tightened. Between the ends of the recess on the outer surface of the outer collet 1 and sleeve 11 are placed an elastic element 13 in the form of a ring with an open thin-walled cross-section and a ring compensator 14. Case 5 is attached to spindle 4 with screws 15, 16 and rusk 17. To protect the cylindrical collet 2 from being twisted, a prismatic key 18 is inserted into the head of the outer collet 1 (Fig. 4), the protruding part of which fits into the longitudinal groove of the cylindrical collet 2. A screw 19 with a conical thread is used to secure the key 18, and a slot is made to ensure its compliance (Fig. 5).

When assembling, the housing 5 with the key 8 is fixed on the end face of the spindle 4. The elastic element 13, the ring 14 and the sleeve 11 are put on the outer collet 1, screw the nut 6 with the clamp pipe 7, and partially insert it from right to left (Fig. 1) into the spindle hole 4. Petals of the intermediate collet 3 are inserted into the opening of the sleeve 11, placing them also in the radial grooves of the housing 5, then the cylindrical collet 2 is inserted axially, aligning the internal projections 10 of the intermediate collet 3 with its longitudinal grooves. Turn the cylindrical collet 2 at 60 °. A key 18 is inserted and the screw 19 secures it into the groove of the outer collet. 1. On the housing 5 screw the nut 12, pressing the petals of the intermediate collet 3 to the housing 5.

The work of the cartridge is as follows.

When the outer collet 1 is displaced to the left (Fig. 1), the axial drive force is transmitted through the elastic element 13 to the conical head of the intermediate collet 3, stationary along the axis. Thus, the outer collet 1 and the intermediate collet 3, each interacting with one of the working sections of the cylindrical collet 2, secure the workpiece 9 in two sections. Since the cylindrical collet 2, which is in contact with the workpiece 9 in the axial direction, is stationary, the axial, clamping accuracy is significantly increased. The unclamping takes place in reverse order when the outer collet 1 is moved to the right.

The economic effect of using the proposed collet chuck is due to an increase in the axial precision of the clamping of the blanks. This makes it possible to save metal in the workpieces by reducing the allowance for undercutting. In addition to saving metal, a reduction in the machining time of parts that do not require butt trimming is expected, as well as savings due to a reduction in the amount of incisors that are used to trim.

Claims (1)

Invention Formula Collet Chuck Auth. St. No. 566680, characterized in that, in order to improve the fixing accuracy, a protrusion is made on the inner surface of the intermediate collet, and a groove designed for interacting with said protrusion is on the outer surface of the additional cylindrical collet. Sources of information taken into account during the examination 1. USSR Author's Certificate No. 566680, cl. B 23 B 31/20, 1976. A a FIG. 2 5-6 9ig: 5  - d type G R . V FIG. h