NO744515L - - Google Patents

Description

Reversible, cube-shaped cutting tool for chip separation processing

and the placement of the cube in a steel holder with expansion possibilities for even larger cuts than the drawing suggests.

This invention relates to a hard metal cutting tool with high breaking strength for placement in a steel holder in a lathe, where the turning work relates to chip-removing processing in metal, preferably cast iron and steel.

The area of application includes use in large, powerful tools-

machines, where hot running and/or rapid wear of the edge is a problem, and where regular breakage of the attached cutting

body (cutting plate) occurs with a frequency that is unacceptable. As an example, we can mention the turning of large cylinder liners for marine diesel engines where rough cuts and a relatively high turning speed are required.

The purpose of the invention is to provide a cutting tool

which makes it possible to carry out deburring with the greatest possible cutting depth and speed, especially for such cases as described under section "area of application". Preferably, this applies to chip-separating processing on workpieces of 1 tonne and more. Furthermore, the purpose is to provide a cutting tool which, due to its geometric shape, allows for significantly more alternative cutting edges, and where these can be used in turn by turning the cutting element.

Previously known in the area are the plate-shaped shears available in the trade, where length/width+thickness e.g. can be about 30 x 20 x 12 mm, and where a transverse drilling often weakens the cross-section. The possibility of using alternative cutting eggs is very limited. Breakage of such cutting elements occurs all too often in powerful lathes - and with consequent loss of time and damage.

Norwegian patent no. 119772 deals with a tool system that takes aim

on enabling chip removal with a high cutting speed and solving the problems of a series of interacting cutting elements in a specific geometric location in the steel holder.

Fig. 2. Fastening device for cubes

We can follow the text in the design example where the cube-shaped cutting element (1) is placed in the steel holder (2) and clamped from above with the screw clamp (3) using the addition screw (5). The clamping device C3) grips the cube in a submerged part (4) and presses this against the substrate in the steel holder. (Or against an intermediate layer plate - if this is desired - due to wear etc.)

This (these) plate(s) must have a hole in the center which should be slightly larger than the cube's, otherwise we will not achieve any attraction.

On the underside, the cube can be pulled in against the steel retaining wall with help

of the screw (6) which pulls the pin (7) inward and drags the cube with it. To be absolutely sure that the cube is completely fixed, I have also indicated a screw 6a to pull the screw clamp (3) back.

I have drawn in the adjusting screw (9) because that if the pin (7) is too short or long for various reasons, we should be able to adjust this. Parts 7 and 9 are deliberately drawn relatively large, this only for

to bring out the purpose and mission.

These base plates I have mentioned are also not registered,

but here I let the manufacturer have "free rein".

The cutting angles of the cutting body have not been shown either, this will also be the manufacturer's problem, but on another sketch (of the entire holder) this comes out better.

If we consider the holder I made in wood and the sketch of this, there may be things that can be misunderstood. E.g. this I mentioned about "over-lapping". I have tried to exaggerate this in the sketch, but it can also be an advantage, namely that if, in addition to these 24 cutting surfaces, we grind the cube, as I have also indicated before, one will also

could extend the life of this (in my opinion cheap cutting alloys) further. If you assume that the cut that takes the innermost (finished) is exact, you can make the innermost contact surface for the cubes in the holder exact, then with an adjustable device behind the cube you can use (grind) this until the overlap is gone.

US patent no. 2 89 7 80 also does not seem to cover the present invention, as the invention concerns the construction of the steel holder and problems in connection with the chip breaking p and that this has little relevance for e.g. chipping of cast iron blanks. - In addition, the solution seems quite complicated and expensive.

In the present invention, the technical solution is to design the cutting element as a cube, or as a cube with an approximately cubical shape. Theoretically, the cube should allow for a full 24" cutting eggs.

In any case, you should have the option of attaching a clamping plate

("sink") in 4 of the cube's 6 side surfaces get 16 cutting eggs, which could be used in turn when turning the cutting element. For fixing, at least 4 of the sides are made with a symmetrically placed sunken part ("sink") around the center of the side surface, which will form a contact surface for the clamping plate (screw clamp).

Claims (2)

1. Reversible, chip-removing cutting tool for use mainly in lathes where a hard metal cutting element is used for chip-removing processing of large workpieces, especially of cast iron, characterized by the fact that the cutting element is designed essentially as a cube, and where at least 4 of the side surfaces are provided with sunken, symmetrically arranged, middle sections which can form a fixture for screw clamps and which enable the cube-shaped cutting element to be turned for alternative use of at least 16 cutting edges, but with 6 sunken sections 24 cutting edges. 2. Device according to claim 1, characterized in that the cube-shaped cutting element gives the opportunity for a supplementary screw clamp device to be brought into effect from below, as a fixing pin grips the alternative immersion in the underside of the cube and presses the cutting element against the steel holder with a horizontally acting Power.