JPS5946721B2 - Cutting tools - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a cutting tool having a disposable insert.

Specifically, one invention relates to cutting tools and inserts that are particularly adapted to withstand the high cutting forces encountered when removing bulk workpieces from metal workpieces.

Metal cutting tools with disposable inserts are well known.

A typical such metal cutting tool has a body or shank portion and a head portion, the head portion having a pocket or recess that includes:
The receptacle is adapted to receive disposable inserts having one or more cutting heads and of various sizes and shapes.

The plug-in tip is held in place by a set screw;
The set screw is inserted through a hole in the bayonet tip and extends into the head portion through the underside of the pocket.

In this case, the plug-in tip is provided below the plug-in tip by clamping means, i.e. by the well-known bridge-type clamp or finger-type clamp, or for example by means of the well-known bridge-type clamp or finger-type clamp, 33419
No. 21 and No. 3,341,923, the wedge means incorporated in the plug-in tip hole screws easily adjustably hold the plug-in tip in place.

Although prior art devices for holding inserts have considerable advantages, when cutting metal in large quantities, where feeds of magnitude greater than 0.64α are used,
It was found that it lacked holding power and resistance to the large forces generated.

For example, prior art clamping means are susceptible to breakage or jamming under the associated cutting forces, making easy indexing of the insert unduly time consuming or impractical. Or it turned out to be impossible.

Therefore, the main object of the present invention is to provide a metal cutting tool which is particularly suitable for carrying out heavy metal cutting operations without physical damage, and at the same time allows for easy indexing or replacement of the cutting edge applied to the workpiece, and a disposable metal cutting tool. It is to provide a plug-in chip.

The cutting tool of the present invention has a shank portion and a head portion, the head portion has a pocket, and the pocket includes:
The receiver is designed to be inserted with the exposed insert tip in contact with the wall of the pocket.

The insert has a flat lower surface, a recessed upper surface, and at least one cutting edge.

A finger of a clamp having a protrusion corresponding to the shape of the recess is engaged in the recess of the insert tip to hold the insert tip in the head portion.

The recess on the upper surface of the insert tip is circular in shape, the flat bottom surface of the recess is parallel to the lower surface of the insert tip, and the side surfaces of the recess are orthogonal to the rounded bottom surface of the insert tip. extends to the upper side of the force.

Further, the finger protrusions of the clamp have an arcuate cross section obtained by cutting the cylindrical shape along a plane parallel to the axis of the cylindrical shape.

A bottom surface portion of the finger protrusion of the clamp is flat, and the bottom surface portion is adapted to meet the flat bottom surface of the recess, and a side portion of the finger protrusion of the clamp is arranged to meet a circular side surface of the recess. It is designed to fit together.

With this configuration, when the clamp is tightened to the insert tip, the recess of the insert tip and the protrusion of the finger of the clamp fit perfectly, and the tightening force is correctly transmitted to the insert tip.

This ensures that the plug-in tip is tightly mounted against the wall of the pocket in the head section.

Features believed to be novel of the invention are set forth in the claims.

However, from the following description and drawings, the present invention may be better understood and its objects and advantages may be appreciated.

The drawing shows a metal cutting tool 1 with a partially shown shank part or body 2, but the shank part or body 2 can be extended as required.

The cutting tool 1 also has a head part 3, said head part 3
, any special shape of the plug-in tip, e.g. square,
The receptacle has a recess or pocket 4 adapted to receive a round, hexagonal, hexagonal, diamond-shaped, etc. shape.

The walls of pocket 4 are precisely machined and flat,
Its corners 5 are normally stress relieved.

A plug-in cutting tool 6 is attached to the pocket 4 and is held in place by an adjustment screw 7, which is screwed into a hole 8 in the head section, allowing it to be inserted into the head section as required. It can be stretched like

The surface of the seat 6 is precisely shaped to fit snugly and tightly against the bottom of the pocket 4 and even better against the walls of the pocket 4, thus transferring heat from the cutting edge. It serves the purpose and spreads the cutting force over the entire surface of the pocket, preventing physical damage to the pocket and extending the life of the pocket.

The plug-in chip 9 is attached to the plug-in chip 6, but as mentioned above, any of various shapes can be adopted, and the figure shows a rectangular chip as an example.

The plug-in tip 9 of the present invention is special in several respects.

For example, the plug-in tip has a flat bottom 10 and sides that are precisely shaped or ground to mate with the corresponding surfaces of the seat 6 and the walls of the pocket.

Where indicated, the insert for light cutting can of course be bi-sided or have cutting edges on the upper and lower sides.

The insert 9 has a cutting edge 12 and, optionally, a chip-breaking groove 13, which groove 13 can take any of a variety of desired shapes well known to those skilled in the art.

A feature of the plug-in tip 9 is that there are no pre-drilled holes for mounting, for the purpose of increased strength.

Instead, there is a recess 14 on the top surface of the insertion chip, and although the recess is circular or thin cylindrical in the figure, it is also possible to adopt a shape similar to a circular shape, and the clamp 15 can be formed by the method described later. Collaborate.

The clamp 15 can also take any of a variety of shapes, but the one shown is of a normal bridge type and has a main body 16 partially inserted into the head portion 3 and an arm or finger 17. However, the end 18 of the arm or finger 17 is shaped to mate with a recess in the insert tip 9 to hold the insert firmly in place.

As shown, this end or protrusion 18 has the shape of a portion of a cylinder (cut parallel to the axis) and meets the arcuate rim of the recess 14; The recess 14 of the desired shape can be changed to match the recess 14 of the recess 14 of the desired shape.

When the clamp is tightened on the bayonet tip 9, the recess 14 and the mating edge or protrusion 18 serve to hold the bayonet tip 9 in place and firmly on the bayonet tip bed 6 and against the wall of the pocket 14. .

Means for keeping the clamp 15 in place on the head part 3 of the tool holder 1 are known, for example as illustrated in US Pat. No. 2,955,349, but at the same time in combination with other preferred features of the present invention. It serves to increase the overall resistance and suitability of metal for heavy cutting.

As shown in FIG. 1b, the clamp screw 19 extends through the body 16, and the upper portion 20 of the clamp screw 19 is unidirectionally threaded to mate with a threaded hole 21 in the clamp body 16; The lower part 23 has a threaded hole 2 which is threaded in the opposite direction and mates with that of the head part 3.
It is screwed into 4.

Both the upper and lower ends of the clamp screw 20 have concave heads,
Adjustments are typically easily made with a matching wrench.

By rotating the upper part 20 of the set screw or clamp screw 19, the clamp can be temporarily loosened and lifted from the locked position of the tool holder.

When the crank screw 19 is tightened, this tightening simultaneously lowers the clamp into position and works to lock the insertion tool 9 in place by the cooperation of the protrusion 18 and the recess 14.

As previously mentioned, the present invention has several advantageous features, including the protrusion 18 which mates with a cooperating recess in the plug-in tip 9.
The clamp 15 is particularly adapted to withstand the large forces involved in removing large chips from metal workpieces.

[Brief explanation of the drawing]

FIG. 1 is a plan view of an embodiment of the present invention, FIG. 1a is a side view of the embodiment, and FIG. 1b is a sectional view taken along line BB in FIG. 1. 2...Shank part of cutting tool, 3...
・Head part, 4...concavity, 6...seat, 9...insertion tip, 15...clamp, 18...protrusion .

Claims (1)

[Claims] 1 has a shank portion and a head portion, the head portion has a pocket, the pocket is adapted to receive a bare insertion tip in contact with a wall of the pocket, and the insertion tip is The insert has a flat lower surface, a recessed upper surface, and at least one cutting edge, and the recess of the insert insert is engaged by a finger of a clamp having a protrusion corresponding to the shape of the recess, thereby cutting the insert insert. In a metal cutting tool adapted to be held in the head portion, a recess on the upper surface of the insert tip is circular in shape, a flat bottom surface of the recess is parallel to a lower surface of the insert tip; The side surface of the clamp is perpendicular to the hollow bottom surface and extends to the top surface of the insert tip, and the finger protrusion of the clamp has an arcuate shape cut by cutting the cylindrical shape with a plane parallel to the axis of the cylindrical shape. a cross-sectional shape, a bottom surface portion of the clamp finger protrusion being flat, the bottom surface portion mating with a flat bottom surface of the recess, and a side portion of the clamp finger protrusion; A metal cutting tool characterized in that the metal cutting tool is adapted to fit with the circular side surface of the recess.