SU914191A1 - Chuck for cutting threads - Google Patents

Description

The invention relates to metal working, in particular to devices for cutting internal and external threads on horizontal automatic lathes and semi-automatic.

Known cartridge for cutting ⁵

threads, including body and. mounted in the housing with the possibility of axial movement of the tool holder associated with the housing through the elastic element [1].

However, the well-known cartridge does not provide the possibility of cutting exact threads due to the lack of a mechanism in it to compensate for radial errors and the imperfection of the axial errors compensation mechanism.

The purpose of the invention is to improve the accuracy of threading.

This goal is achieved by the fact that the cartridge is equipped with a glass, the tail of which is made in the form of a spring of variable stiffness with an outer centering surface, pred2

assigned to interact with the inner centering surface, made in the body, while the tool holder is rigidly connected with the tail part of the glass, and the front part of the glass is installed in the body with the possibility of axial movement.

FIG. 1 shows a cartridge, cut; in fig. 2 shows section A-A in FIG. one.

The cartridge includes a housing 1, a tumbler 2 with a tail part in the form of a spring of variable stiffness, a tool holder 3 and a front tumbler 4. The housing 1 and a tumbler 2 have three longitudinal grooves, each of which holds two to three balls 5 held by the separator 6. The tail part of the tool holder 3 with the key 7 is rigidly connected in the axial direction with the glass 2. With the help of the return spring 8 through the rod 9 the tool holder 3 together with the glass 2 in the free state (until the beginning of the cutting) is tightened

3 91419

to the rearmost position. In this case, the outer conical centering surface on the shank of the glass 2 comes into contact with the inner conical centering surface of the housing 1. $

In this position, the front part of the tool holder 3 is supported by the entire conical surface on the centering surface of the axially floating annular support 10 installed in the front glass 4.

With the help of springs 11, the annular support 10 is moved forward and its supporting centering surface contacts with the conical surface _{of the} tool holder _{1 $} .

Thus, in the free state (before the start of cutting), the annular support 10 and the shank sleeve 2 The holder ₂₀ provides a centering tool 3 relative to the housing 1 of Tell.

Ring 12 serves as the front stopper amount of displacement of the annular support 10 and simultaneously yavlyaet- Xia casing _25, which prevents the chuck mechanism from being hit by shavings. The tail part of the body of the cartridge is covered with a lid 13, on which the return spring 8 rests, compressed through ₃₀ washer 14 with nuts 15.

The cartridge works as follows.

The torque and the axial movement of the machine tool spindle is transmitted to the housing 1. Prior to insertion tool ³⁵ in otver- stie tool holder 3 is centered relative to the housing 1 (rests on an annular support 10 supported by springs 11 and through hvoetovik cup 2 to the inner centering surface housing 1), which provides a supply of tools to the machined hole without εςο sagging and vibrations at any speed. From the very first moment of the ¹³ incision, the tool 3 with the holder and the glass 2 begin to advance in the centerline. moving the case 1, due to which the contacts of the holder with the annular support 10 and the shank of the glass 2 with the ⁵¹ case 1 are broken, the return spring 8 begins to compress. During this period of operation, the tool holder 3 is connected to the housing 1 only through

1 ⁴ 4

floating in the axial direction (using balls 5 and separator 6). Cup 2, which, transmitting torque, provides the holder with independent movements along the axis of the cartridge and in a plane perpendicular to the axis of the cartridge. This allows the tool to track all the movement errors of the hole being machined (the part rotates), eliminating the effect of the movement errors of the chuck body, its misalignment with the part hole on the accuracy of the cut thread. At the end of threading, the tool exits the hole and the tool holder 3 is adjusted to its original position by means of a spring 8, a rod 9, a cover 13, a washer 14 and nuts 15.

The use of the cartridge when cutting internal and external threads on multi-spindle automatic lathes and semiautomatic machines will improve the machining accuracy, especially when using a combined thread-processing tool with working surface areas using plastic deformation.

Claims (1)

Claim A cartridge for threading, comprising a housing and a tool holder mounted in the housing for axial movement, connected to the housing through an elastic element, characterized in that, in order to improve the accuracy of threading, the cartridge is provided with a cup, the tail of which is made in the form of a spring of variable rigidity with the outer centering surface, designed to interact with the inner centering surface, made in the housing, while the tool holder is rigidly connected to the tail part glass, and the front part of the glass is installed in the housing with the possibility of axial movement.