UA65918A - Turning tool - Google Patents

Abstract

Turning tool includes lever and removable cutting head connected with it by means of a fastening element and equipped with the cutting plate and contacting with cylindrical surface, on which are executed finetooth slits, with appropriate surface of lever. The cylindrical surfaces of lever and cutting head are executed on condition of the convergence of their common geometrical centreline with working edge of the cutting plate, and the longitudinal axis of fastening element is crossed by the axis of cylindrical surfaces at a right angle and is inclined to the bearing surface of lever at an angle of 39-51 DEGREE .

Description

The invention relates to the field of metalworking, namely, to the processing of metals by cutting and can be used in the production and operation of a prefabricated cutting tool.

There is a known pre-assembled cutter, which consists of a holder and a replaceable cutting element with a cutting plate, which is fixed to the holder by means of a screw and a rod passing through the body of the holder (see, for example, the description of the author's certificate of the USSR Me1138253, IPC B23827/16). A turning cutter with a replaceable cutting head is also known, which includes a holder in the front part of which a prismatic socket is provided for installing a prefabricated cutting head, which is equipped with a cutting plate. Clamping of the cutter head in the socket is carried out using a threaded rod, the front end of which has a beveled transverse groove interacting with a trapezoidal protrusion provided on the lower plane of the cutter holder (see, for example, the description of the patent of the GDR Mo226229, IPC B2303/155, which was published on 08.21. .85 Hg).

Despite the difference in construction, the disadvantage of these cutters is the impossibility of adjusting the position of the cutting plate, which negatively affects the quality of the surface treatment of the part.

This shortcoming is partially eliminated in another well-known turning cutter (see the description of the German patent Me3326665, IPC вВ23829/12), which, in terms of the set of essential features, is the closest to what is claimed.

A known turning cutter, like the one that is claimed, contains a holder and a removable cutting head connected to it by means of a fastening element, which is equipped with a cutting plate. The removable cutting head and the holder contact each other with cylindrical surfaces on which fine-toothed slots are made, and their connection after adjusting the position of the cutting head is carried out by a fastening element.

However, this design of the cutter ensures rotation of the cutting head only around the longitudinal axis of the holder, and the back angle of the cutting plate remains unchanged. As a result, during the transition from the rough processing of the part to the finishing operation, it is necessary to replace the cutting head, which requires the presence of a set of replaceable cutting heads, and, therefore, leads to an increase in the cost of processing the part.

At the same time, replacing the cutting head requires additional labor.

The invention is based on the task of creating a turning cutter that provides a reduction in the cost of processing the part while simultaneously reducing labor costs by expanding the technological capabilities of the turning cutter and due to the technical result, which consists in adding a degree of freedom of rotation to the cutting head relative to the working edge of the cutting plate.

To achieve this technical result in a lathe cutter, which includes a holder and a removable cutting head connected to it by means of a fastening element, which is equipped with a cutting plate and contacts a cylindrical surface on which fine-toothed slots are made, with the corresponding surface of the holder - the mentioned cylindrical surfaces the holder and the cutting head are made with the condition that their common geometric axis coincides with the working edge of the cutting plate, and the longitudinal axis of the fastening element intersects the indicated axis of the cylindrical surfaces at a right angle and is inclined to the support surface of the holder at an angle of 39-51".

There is a cause and effect relationship between the distinguishing features of the invention and the technical result achieved. Due to the execution of the cylindrical surfaces of the holder and the cutting head with the condition that their common geometric axis coincides with the working edge of the cutting plate, the cutting head has a degree of freedom of rotation relative to the working edge of the cutting plate, i.e. it became possible to carry out an adjustment rotation of the cutting head to adjust the back angle of the cutting plate. At the same time, due to the installation of the fastening element in the lathe cutter, when its longitudinal axis intersects the axis of the cylindrical surfaces of the cutting head and the holder, and is inclined to the support surface of the holder at an angle of 39-51", reliable pressing of the cutting head to the holder is ensured.

The design of the applied cutter allows not to replace the cutting head during the transition from the rough processing of the part to the finishing operation. In this case, it is only necessary to adjust the back angle of the cutting plate. Therefore, there is no need for a set of replaceable cutting heads, which reduces the cost of processing the part, and labor costs are also reduced, because the operation of replacing the cutting head is excluded.

The essence of the invention is explained by the drawings, where: - Fig. 1 shows a turning cutter (general view) and its orientation relative to the spindle axis of the machine; - in Fig. 2 - view A in Fig. 1; - in Fig. 3 - section B-B in Fig. 1.

The lathe cutter includes a holder 1 (Fig. 1) and a removable cutting head 2, which is equipped with a cutting plate 3.

The holder 1 and the cutting head 2 are connected to each other by a fastening element made in the form of a screw 4, and are in contact with each other by cylindrical surfaces 5 and 6 (fig. 2, 3), which are equipped with fine-toothed slots (fig. 2). In the design of the turning cutter, which is claimed, fine-toothed slots of a triangular shape are made on cylindrical surfaces in the area on the side of the outer end of the cutter, and the border of the transition from the area equipped with fine-toothed slots to the area with a smooth surface in fig. 1 is shown by a dashed line.

A distinguishing feature of the claimed turning cutter is the mentioned cylindrical surfaces 5 and 6, which are made with the condition that their common geometric axis О-О coincides with the working edge 7 of the cutting plate З (Fig. 1). As a result of this design, it became possible to carry out an adjustment rotation of the cutting head 2 in relation to the working edge 7 of the cutting plate Z to establish the optimal value of the back angle bsopt of the cutting plate (in Fig. 2, the axis О-О, and therefore the working edge 7 is projected to point 0) .

Another design feature of the claimed cutter is the placement of the fastening screw 4, equipped with a gasket 8, with the condition that its axis 01-01 intersects with the О-О axis at a right angle, which in fig. With designed to a point

О, at the same time, the О1-Ои axis is inclined to the support surface of the holder at an angle В -39-517. Such placement of the screw 4 contributes to reliable fixing of the removable cutting head 2 on the holder 1.

Thus, from the description of the design of the turning cutter, which is claimed, it follows that the rotation of the cutting head around the working edge of the cutting plate allows you to set the optimal back angle of the cutting plate, both for rough processing of the part, and for semi-finished and finished processing, which expands the technological capabilities of the cutter .

Cutter work

After installing the removable cutting head 2 (Fig. 1) in the holder 1, the screw 4 is freed from contact with the cutting head 2, which, having a free degree of rotation around the working edge 7 of the cutting plate 3, is adjusted to - and - Goy. - - - . . optimal back angle pt of the cutting plate, for this operation and is fixed with screw 4 on the holder 1. For us . - not oopt - 6-72 I - Obopt - 92 - rough processing operations optimal back angle opt 6, for semi-clean opt З, and for clean sbopt - 129 s. more wholesale Therefore, when moving from one part processing operation to another, the back angle of the cutting plate is adjusted. To do this, the screw 4 is released from contact with the cutting head 2, the adjusting rotation of the cutting head 2 and its fixing with the screw 4 on the holder 1 is performed.

As can be seen from the description of the cutter operation, during the transition from the operation of rough processing of the part to the final one, it is not necessary to replace the cutting head, which leads to a decrease in the cost of processing the part.

The lathe cutter of the proposed design has been manufactured and is successfully used in a number of shops of the "Novokramatorsk Machine-Building Plant". not a plus

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Claims (1)

A turning cutter, which includes a holder and a removable cutting head connected to it by means of a fastening element, which is equipped with a cutting plate and contacts a cylindrical surface on which fine-toothed slots are made, with the corresponding surface of the holder, which is characterized by the fact that the mentioned cylindrical surfaces of the holder and cutting heads are made with the condition that their common geometric axis coincides with the working edge of the cutting plate, and the longitudinal axis of the fastening element intersects the specified axis of the cylindrical surfaces at a right angle and is inclined to the support surface of the holder at an angle of 39-517.