RU2329124C1 - Method of part fastening and device for its implementation - Google Patents

Abstract

FIELD: technological processes.

SUBSTANCE: method includes interaction of clamping unit with part by means of power mechanism during roughing and finishing works. Part fastening during roughing work is carried out with clamping unit, which simultaneously interacts with two power mechanisms, and during finishing work - with single power mechanism. Device contains clamping unit and power mechanism. Clamping unit consists of casing with threaded rod, at external conical surface of casing collet is installed, and pressing nut is installed on threaded rod. It is equipped with bushing that is connected to collet by means of T-shaped lock. Pressing nut is arranged with the possibility of interaction with the help of T-shaped lock with bushing, and on external surface of pressing nut additional power mechanism is installed, which is made in the form of compression spring that contacts by its one end with collet and by the other one via cartridge with stop ring that is installed in ring groove of bushing.

EFFECT: increase of part fastening efficiency during transition from roughing operation to finishing one.

2 cl, 1 dwg

Description

The invention relates to metalworking and can be used in clamping devices, in particular when fixing cylindrical thin-walled blanks.

A known method of securing a part, including the interaction of the clamping unit with the part by means of a power mechanism during roughing and finishing (see RU 2030257, B23B 31/40, 1995).

A device for securing a part is also known, comprising a clamping assembly and a power mechanism, the clamping assembly consisting of a housing with a threaded rod, a collet mounted on the outer conical surface of the housing, and a compression nut on the threaded rod (see also).

The main disadvantage of the known methods of securing the part and device for its implementation is the low accuracy of processing the workpiece at the finishing stage. The disadvantage is due to the fact that at the finishing stage, to prevent deformation, the workpiece must be fixed with a lower clamping force than at the rough stage, and for this it is necessary to unscrew the pressure nut by a certain angle, which is difficult to do manually. The difficulty also lies in providing the required effort to secure the workpiece during the transition from roughing to finishing.

The technical problem to which the invention is directed is to increase the accuracy of machining a part in the transition from roughing to finishing.

The technical result is achieved in that the fixing of the part during roughing is carried out by a clamping unit interacting simultaneously with two power mechanisms, and during finishing with one power mechanism.

A device for securing a part comprises a clamping assembly and a power mechanism, the clamping assembly consisting of a housing with a threaded rod, a collet mounted on the outer conical surface of the housing, and a compression nut on the threaded rod. The device is equipped with a sleeve connected by means of a T-lock with a collet, the push nut is made to interact with the T-lock with the sleeve, and on the outer surface of the push nut there is an additional power mechanism made in the form of a compression spring in contact with one end with collet, and another through a sleeve with a retaining ring located in the annular groove of the sleeve.

Figure 1 shows a device for securing the part in the position of the rough processing of the workpiece, a General view in section;

figure 2 - device for securing the part in the position of the finishing workpiece.

The device for securing the part consists of a clamping unit comprising a housing 1, in the central part of which a spherical support 2 is located. A collet 3 is located on the outer conical surface of the housing 1, which is used to secure the workpiece 4. The collet 3 is connected to the sleeve 5 by means of a T-shaped lock. An annular groove 6 is made at the right end of the sleeve 5. At the right end of the housing 1 there is a power mechanism for securing the part 4, consisting of a threaded rod 7 of the housing 1 and a pressure nut 8. The pressure nut 8 by means of T-arr the lock is connected to the sleeve 5. On the outer surface of the pressure nut 8 there is a second power mechanism for securing the part, made in the form of a compression spring 9, which constantly contacts on one side with a collet 3 through the sleeve 5, and on the other hand with the snap ring 10 through sleeve 11. There are other parts made according to the general rules for the design of machine tools such as collet expandable mandrels.

The method of fixing parts is as follows.

In the initial position, the nut 12 is removed from the housing 1. The worker installs the workpiece 4 on the collet 3 and preliminarily presses it with the nut 12 against the support 2. Then, rotating the push nut 8, first with the spring 9, and then with the push nut 8 moves the collet 3 to the left and secures the workpiece 4 with an effort to ensure its reliable fastening during roughing. After this, the workpiece 4 is secured with a nut 12. After roughing, the worker unscrews the pressure nut 8, excluding its contact with the sleeve 5, and therefore with the collet 3. In this case, the workpiece 4 will be fixed only by the force of the spring 9, which ensures its reliable fixing during finishing.

The proposed method of securing the part and the device for its implementation will allow, at the minimum cost of technological equipment, to ensure high precision processing of thin-walled parts. The effect is achieved due to the use of two power mechanisms interacting with the clamping unit in the device design, which allows to reduce the clamping force by eliminating one of the power mechanisms from the interaction.

Claims (2)

1. A method of securing a part, including the interaction of the clamping unit with the part by means of a power mechanism during roughing and finishing, characterized in that the fixing of the part during roughing is carried out by a clamping unit interacting simultaneously with two power mechanisms, and during finishing with one power mechanism . 2. A device for securing a part comprising a clamping assembly and a power mechanism, the clamping assembly consisting of a housing with a threaded rod, a collet mounted on the outer conical surface of the housing, and a threaded nut on the threaded rod, characterized in that it is provided with a sleeve connected to using a T-shaped lock with a collet, the push nut is made to interact with the T-lock with the sleeve, and on the outer surface of the push nut there is an additional power mechanism made in the form ruzyne compression, contacting with one end of the collet and the other - through the sleeve with a locking ring disposed in the annular groove of the sleeve.

Images