SU1303276A1 - Composite cutting tool - Google Patents

Description

The invention relates to metal working.

A collection cutting tool is known, comprising a holder, a cutting plate and a mounting screw with a conical head and a threaded portion, located in the hole of the intermediate element having surfaces for engaging with the side surface of the cutting plate and the head of the fixing screw.

The known assembled cutting tool is characterized by insufficient reliability of fixing the cutting insert.

The purpose of the invention is to increase the reliability of attachment of the cutting insert.

The goal is achieved by the fact that in a assembled cutting tool comprising a holder, a cutting plate and a fixing screw with a conical head and a threaded part, placed in the hole of the intermediate element, having surfaces for

The tool contains a holder 1, provided on the front of the protrusions 2; The cutting plate 3 contacts the side surfaces with the protrusions 2 and the working tip of the cutting plate 3 is brought into the lumen between the projections 2. In the holder 1 there is a threaded hole 4 in which the fastening screw 5 is screwed with the conical head 6 located in the intermediate hole element 7. On the head of the fastening screw 5 perpendicular to the axis there is a supporting platform 8, which interacts with the intermediate element 7. Between the conical head 6 and the threaded part of the fastening screw 5 there is an elastic section 9 on which Ružiná 10. At the intermediate member 7 vy20 full surface 11 cooperating with the front surface of the cutting insert and the surface 12, cooperating with the lateral surface of the cutting insert 3. At the rear Storo EG

interaction with the side surface of the non-intermediate element 7 of the cutting plate and the head of the fastener 13, coinciding in shape with

adjacent side 14 of the holder 1, the difference between the radius of the larger base of the conical head 6 of the fixing screw 5 and the radius of the hole

on the intermediate element there is a surface for interacting with the front surface of the cutting plate; a supporting platform is perpendicular to the axis of the mounting screw for the axis for interacting with the intermediate element, and an elastic section is made on the fastening screw between the head and the threaded part; the fastening screw heads are smaller than the radius of the hole in the gap) | diurnal element by an amount determined from the ratio:

in intermediate cell 7 is determined from the ratio;

35

g f - t t, t (

40

h

g,

where r is the radius of the larger base

conical head 6 of the mounting screw 5;

the radius of the hole in the intermediate element 7; the distance from the side surface of the cutting plate 3 to the axis of the mounting screw 5; the distance from the side surface of the cutting plate 3 to the axis of the hole in the intermediate element 7. When attaching the cutting plate 3, the fixing screw 5 is screwed into the hole 4 of the holder 1.

- year

g,

radius of the larger base of the conical head of the mounting screw;

the radius of the hole in the intermediate element; the distance from the side surface of the cutting plate to the axis of the mounting screw; the distance from the side surface of the cutting plate to the axis of the hole in the intermediate element.

. 1 shows a collection cutting t, longitudinal section; on the same top view.

The tool contains a holder 1, provided on the front of the protrusions 2; The cutting plate 3 contacts the side surfaces with the protrusions 2, and the working tip of the cutting plate 3 is brought into the lumen between the projections 2. In the holder 1 there is a threaded hole 4 into which the fastening screw 5 is screwed with a conical head 6 placed in the hole of the intermediate element 7 On the head of the mounting screw 5 perpendicular to the axis there is a supporting platform 8, which interacts with the intermediate element 7. Between the conical head 6 and the threaded part of the mounting screw 5 there is an elastic section 9 on which a spring is attached 10. At the intermediate member 7 formed surface 11, cooperating with the front surface of the cutting insert and the surface 12, cooperating with the lateral surface of the cutting insert 3. At the rear Storo

in intermediate cell 7 is determined from the ratio;

35

g f - t t, t (

0

five

h

g,

“,

where r is the radius of the larger base

conical head 6 of the mounting screw 5;

the radius of the hole in the intermediate element 7; the distance from the side surface of the cutting plate 3 to the axis of the mounting screw 5; the distance from the side surface of the cutting plate 3 to the axis of the hole in the intermediate element 7. When attaching the cutting plate 3, the fastening screw 5 is screwed into the hole 4 of the holder 1.

Due to the fact that the difference between the radius of the hole in the intermediate element 7 and the radius of the larger base of the conical head of the retaining screw 5 is smaller than the difference of distances from the side surface of the cutting plate to the axis of the hole in the intermediate element 7 and to the axis of the hole

The pin screw of the taper head of the fastening screw 5 interacts with the lateral surface of the hole in the element 7 in the area facing the cutting plate 3.

With further fastening of the fastening screw 5, the surfaces 11 and 12 of the intermediate element abut against the cutting plate 3, which presses against the lower bearing surface and the side stops 15 on the projections 2. The subsequent screwing of the fastening screw 5 causes the elastic portion 9 to bend inward, which increases The force of fastening the cutting insert.

76, 4

The presence of flats 13 on the intermediate element 7 eliminates the possibility of its spontaneous rotation. To release the cutting plate 3, the fastening screw 5 is unscrewed from the hole 4 of the holder 1, which relieves the deformation of the elastic section 9. Under the influence of the spring 10, the intermediate element 7 rises. Then turn it, freeing the cutting plate 3.

The proposed modular cutting tool allows you to increase the reliability and crush of the cutting plate and thereby increase the machining performance and durability of the cutting tool.

FIG.

Compiler A.Akimov Editor A.Ogar Tehred L.Serdyukova Proofreader A.Obruchar

Order 1248/12 Circulation 976 Subscription

VNIIPI USSR State Committee

for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5

“Production and printing company, Uzhgorod, Projecto st., 4

2

Claims (1)

ASSEMBLY CUTTING TOOL, comprising a holder, a cutting insert and a fixing screw with a conical head and a threaded part, located in the hole of an intermediate element having surfaces for interacting with the side surface of the cutting insert and the head of the fixing screw, characterized in that, in order to increase the reliability of fixing the cutting plate, on the intermediate element there is a surface for interaction with the front surface of the cutting plate, on the head of the fixing screw perpendicular to the axis there is a support I site for reaction with the intermediate member, and between the head and the threaded portion formed on the fastening screw a resilient portion, the radius of the larger base of the conical head of the fixing screw hole smaller than the radius in the intermediate member by an amount determined by the relation: where r ₍ is the radius of the larger base of the conical head of the mounting screw; g ₂ is the radius of the hole in the intermediate element; £ ₍ is the distance from the side surface of the insert to the axis of the fixing screw; - the distance from the side surface of the insert to the axis of the hole in the intermediate element. 1303276 '