KR20100057549A

KR20100057549A - Fixture of cuttering insert

Info

Publication number: KR20100057549A
Application number: KR1020100036466A
Authority: KR
Inventors: 정순철
Original assignee: 정순철
Priority date: 2010-04-19
Filing date: 2010-04-19
Publication date: 2010-05-31

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cutting insert holding device, and more particularly, to a configuration of a clamp for coupling a cutting insert to a tool holder, thereby allowing the cutting insert to be mounted in a more stable state. In particular, the present invention relates to a fixing device for cutting inserts configured to securely hold a cutting insert having a hole drilled in the center of the insert on a seat of a tool holder.
To this end, the present invention is to solve the problems caused by the planar inclined surface by using a cylindrical inclined surface instead of the conventional inclined surface in the clamp and tool holder. Its content is such that the semi-cylindrical inclined protrusion of the clamp and the cylindrical inclined groove of the tool holder are rotated so that the center line of the insert and the center line of the protrusion of the clamp are difficult to completely match. The problem has been completely solved, and the prior art has a problem that the upper part of the cutting insert and the lower part next to the protruding part of the clamp are hardly in close contact. However, in the present invention, when the semi-cylindrical inclined projection of the clamp and the cylindrical inclined groove of the tool holder are engaged with each other, and the center part of the insert center hole and the center line of the protrusion of the clamp is made of line contact instead of surface contact, It has a structure that can be easily shaken in the lateral direction, that is, the insert central hole and the protrusion of the clamp coincide with each other in line contact with each other, and the semi-cylindrical inclined protrusion of the clamp and the cylindrical inclined groove of the tool holder are engaged. The line contact with each center line is also in line, so that the clamp is easily moved laterally. That is, either the clamp protrusion or the semi-cylindrical inclined surface protrusion is a structure that does not claim a reference point first. After inserting the clamp fixing bolt into the clamp bore of the clamp and tightening the clamp fixing bolt to the clamp fixing screw of the tool holder, there is no reference point until the lower point next to the protrusion of the clamp contacts the upper surface of the cutting insert. After all, the clamp is a cutting insert holding device invented to be in close contact with the upper part of the cutting insert.

Description

Cutting insert cutter

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cutting insert holding device, and more particularly, to different cutting arrangements for joining a cutting insert to a tool holder, thereby allowing the cutting insert to be mounted in a more stable state.

In particular, the present invention relates to a fixing device for cutting inserts configured to securely hold a cutting insert having a hole drilled in the center of the insert on a seat of a tool holder.

The cutting insert mounted on the tool holder is for machining the workpiece, and the edge of the insert can take the shape of square, triangle, rhombus, square, and rectangle.

Tool holders equipped with these cutting inserts are used for cutting operations such as turning, milling and drilling. Tool holders equipped with such cutting inserts have been widely used in metalworking machines with the cutting edges at the edges.

1 is a cross-sectional view showing a tool holder coupled to a cutting insert and a clamp according to the prior art.

As shown in Fig. 1, the structure of the tool holder equipped with the cutting insert is as follows. The tool holder 300 is formed with a screw for fixing a pocket and a seat for fixing the cutting insert on the front surface, and a part of the spring and clamp fixing bolt to be accommodated a little later, and a groove having an inclined surface behind the tool holder 300. Consists of. The sheet 500 is placed on the pocket portion of the tool holder and fixed with the fixing bolt 550 through a hole formed in the center of the sheet 500. The cutting insert 100 is placed on the fixed seat 500, and the spring 350 is placed in the spring receiving space 340 formed in the tool holder 300, and then the hole is formed in the clamp 200. Insert the clamp fixing bolt 120, the clamp fixing bolt 120 passes through the center of the spring 350 to match the screw 150 formed in the tool holder 300, and the protrusion 230 of the clamp is a cutting insert After engaging the hole 110 formed in the center of the 100, and tightening the clamp fixing bolt 120, the inclined surface 330 formed in the clamp and the inclined surface 250 formed in the tool holder 300 is engaged to the cutting insert 100 ) Is tightly fixed to the inner wall 310 of the pocket and the bottom surface 320 of the pocket.

The most ideal assembly of the cutting insert is the hole 110 formed in the center of the cutting insert 100 along the lines L and L1 shown in FIG. 2 and the protrusion 230 of the clamp 200 completely coincide with each center line. In addition, the clamp fixing bolt 120 is tightened in a state where the lower portion of Y and Y1 shown in FIG. 3 is completely horizontal with the upper portion of the cutting insert 100, and the inclined surface 250 of the tool holder 300 and the clamp The inclined surface 330 fits perfectly and despite the influence of the clamp fixing bolt 120, it is time to meet the above conditions. If the above condition is not satisfied, the tool user tightens the clamping bolt 120 strongly but a gap is generated, so that the cutting insert 100 is moved due to the machining vibration and the load and is eventually broken.

However, there is no method in the prior art that completely satisfies the above conditions. The reason is that the cutting insert 100 is graded and produced within the allowable tolerance range, and the problem of the precision of the tool holder 300 and the clamp 200, the wear of the processing tool, the precision of the machine tool, etc. Because it is holding. In addition, in the conventional technique, as shown in FIG. 3, the clamp must be precisely fixed based on the part (a). As a result, part (a) is fixed on the basis of part (b), so that the above problem cannot be solved.

KR10-0450439 KR10-0533312 KR10-0676954

The present invention was created to solve the problems of the prior art as described above, and an object of the present invention is to provide a tool holder that can secure the cutting insert more firmly, which can extend the precision of machining and the life of the tool. To provide a clamp.

In order to achieve the above object, the present invention provides a cutting insert having a center hole, a bottom portion and a wall portion having a wall for placing the cutting insert, a spring recess for contacting a spring, and a clamp for moving the clamp. A tool holder having a cylindrical inclined groove for the tool holder, positioned at the top of the tool holder and inserted into the center of the hole of the cutting insert, and having a protrusion for pushing and pressing the cutting insert toward the bottom of the seat part and the wall, and a clamp fixing screw A screw recess, a spring adapter for inserting the spring and a clamp bore, a semi-cylindrical inclined protrusion projecting in contact with the cylindrical inclined groove of the tool holder to fix the cutting insert placed in the tool holder, the screw recess of the clamp and When the clamp is fixed to the tool holder by screwing it to the tool holder through the clamp bore As clamping screws to apply a force, the spring adapter located between the spring recess and clamp of the tool holder, the cutting insert retainer consisting of a compression coil spring to raise the clamp pulttae the clamping screw is provided.

As described above, the most ideal assembly of the cutting insert is a hole formed in the center of the cutting insert along the lines L and L1 shown in FIG. 2 and the protrusions of the clamps coincide completely with the respective centerlines, and shown in FIG. When the lower part of Y and Y1 is completely level with the upper part of the cutting insert, the cutting insert is fixed with the clamp fixing bolt. It should not be affected by the torsional force of the clamp fixing bolt or the clamp slope.

However, the prior art does not satisfy this condition. The reason for this is that the cutting inserts are graded and produced within the allowable tolerance range as described above, and also have problems such as the accuracy of tool holders and clamps, the wear of processing tools, the precision of machine tools, and the like.

However, in the present invention, when the clamp is tightened with the clamp fixing bolt, the cylindrical inclined groove formed in the tool holder and the semi-cylindrical inclined projection formed in the clamp come into contact with each other, so that the clamp moves smoothly. Holes formed in the center of the cutting insert along the lines L and L1 shown in FIG. 2 and protrusions of the clamps completely coincide with the respective center lines, and the part (a) of FIG. 3 is precisely fixed to the reference point. Satisfy ideal insert assembly.

1 is a cross-sectional view showing an example of a conventional device
2 is a plan view for explaining the conventional apparatus
3 is a plan view of the apparatus according to the present invention.
4 is a cross-sectional view taken along line A, AA of FIG.
Figure 5 is a plan view of the clamp applied to the present invention
Figure 6 is a front view and a detailed view of the clamp applied to the present invention
Figure 7 is a bottom view of the clamp applied to the present invention
8 is a cross-sectional view taken along line B, BB of FIG.
9 is a plan view for explaining a main configuration of a tool holder applied to the present invention;
10 is a cross-sectional view taken along line C, CC of FIG.

In order to solve the above problems of the prior art, it will be described in detail by the accompanying drawings as follows. Figure 3 is a plan view showing a device according to the present invention, Figure 4 is a cross-sectional view taken along line A, AA of Figure 3, Figure 5 is a plan view of a clamp applied to the present invention, Figure 6 is a front view of a clamp applied to the present invention And FIG. 7 is a bottom view of the clamp applied to the present invention, FIG. 8 is a sectional view taken along the line B and BB of FIG. 5, and FIG. 9 is a plan view for explaining the main configuration of the tool holder applied to the present invention. 10 is a cross-sectional view taken along line C, CC of FIG.

As shown in Figs. 3, 4 and 9, the cutting insert fixing device includes a cutting insert 20 for processing a workpiece and a clamp 11 for fixing the cutting insert 20 to the tool holder 10. And a spring recess 10-1 and a cylindrical inclined groove 10-which are provided with a pocket bottom surface 60 on which the seat 30 is seated, and a compression coil spring 104 elastically supporting the clamp 11. 2) the tool holder 10, and the clamp fixing bolt 103 for fixing the clamp 11 to the tool holder 10 and the seat fixing for fixing the seat 30 to the tool holder 10 It consists of a bolt 40.

The cutting insert 20 has an insert central hole 20-1 formed at a center thereof, and the cutting insert 20 is seated on the pocket inner wall 50 and the upper surface of the seat 30 of the tool holder 10. The position is fixed by the clamp 11 and the clamp fixing bolt 103 in the state.

The clamp has a protrusion 11-4 for seating the cutting insert 20 on the inner surface of the pocket inner wall 50 and the seat 30 on one side thereof, and the protrusion 11-4 on the other side thereof. The semi-cylindrical inclined surface protrusion 11-5 is formed in the same direction as this, and the semi-cylindrical protrusion 11-5 is in inclined contact with the cylindrical inclined groove 10-2 of the tool holder 10 to be described later. . In addition, the clamp 11 has a clamp bore 11-1 through which one end of the clamp fixing bolt 103 passes in a direction perpendicular to the protrusion 11-4 and the semi-cylindrical inclined projection 11-11. do. The clamp 11 having such a configuration is clamped in a state where the protrusion 11-4 is fitted to the insert center hole 20-1 of the cutting insert 20 in a state of being mounted on the upper portion of the tool holder 10 to be described later. Position fixing is performed by fastening the fixing bolt 103 to the clamp fixing screw 10-3 of the tool holder 10.

The tool holder 10 is formed with a pocket portion on which the cutting insert 20 and the seat 30 are seated, and the pocket portion includes a vertical pocket inner surface 50 and a horizontal pocket bottom surface 60. In the center of the pocket bottom surface 60, a screw for accommodating the seat fixing bolt 40 is formed. In addition, the tool holder 10 is formed with a spring recess 10-1 in which the compression coil spring 104 is installed at one side of the pocket portion, and a clamp fixing screw below the spring recess 10-1. 10-3) is formed. In addition, as shown in FIGS. 9 and 10, a cylindrical inclined groove 10-2 is formed at one side of the spring recess 10-1, and the cylindrical inclined groove 10-2 is formed of the clamp 11. It is engaged with the semi-cylindrical slope inclined portion (11-5).

In addition, the compression coil spring 104 inserted into the spring recess 10-1 of the tool holder 10 generates an elastic reaction force on the clamp 11 to facilitate assembly with the cutting insert 20. Do it.

The clamp fixing bolt 103 passes through the clamp bore 11-1 of the clamp 11 and the spring recess 10-1 of the tool holder 10 and clamp clamping screw 10-3 at the bottom thereof. ) And when the clamp fixing bolt 103 is tightened to generate a clamping force to the clamp (11).

As shown in Figs. 3, 4, 9 and 10, the structure of the cutting insert fixing device is as follows. The tool holder 10 is formed with a pocket for fixing the cutting insert 20 and the seat on the front surface thereof, and a screw for fixing the seat 30 in the center of the pocket. ) Is formed of a spring recessed 10-1 to assemble and a clamp fixing screw 10-3 for accommodating the clamp fixing bolt 103, and a cylindrical slanting groove 10-2 slightly behind. When the cutting insert fixing device is assembled in order, the seat 30 is first placed on the pocket of the tool holder 10, and the seat fixing bolt 40 is fixed through the hole formed in the center of the seat 30. do. The cutting insert 20 is placed on the fixed seat 30, the compression coil spring 104 is placed in the spring recess 10-1 formed in the tool holder 10, and then the clamp 11 is mounted. The clamp fixing bolt 103 is inserted into the clamp bore 11-1 formed in the clamp bore, and the clamp fixing bolt 103 passes through the center of the compression coil spring 104 so that the spring recess 10 of the tool holder 10 is formed. The protrusion 11-4 of the clamp 11 is fitted to the insert center hole 20-1 formed at the center of the cutting insert 20, which is formed under the negative clamp 1-1. After insertion, the inclined semi-cylindrical inclined projection 11-5 facing the opposite side of the projection 11-4 of the clamp 11 and the cylindrical inclined groove 10-2 formed in the tool holder 10 are inclined. After the line 11-6 is engaged with the boundary, the clamp fixing bolt 103 is tightened to clamp the clamp 11 vertically and horizontally to the cutting insert 20 along the inclined line 11-6. Force, The cutting insert 20 is fixed because of the close contact with the pocket inner surface 50 and the pocket bottom surface 60. The

The cutting insert fixing device of the present invention configured as described above does not appear to be much different from the known technique in appearance. However, the content shows a lot of difference. The difference is as follows.

The first difference is that, as shown in FIG. 2 for the description of the conventional apparatus, the hole formed in the center of the cutting insert along the lines of L and L1 and the protrusion of the clamp are completely coincident with the respective center lines. The movement of the cutting insert can be minimized. If the hole formed in the center of the cutting insert and the protrusion of the clamp do not completely coincide with each center line, the cutting insert moves by that amount. In the conventional apparatus, it is difficult to match the center line of the cutting insert with the center of the clamp protrusion due to the tolerance of the cutting insert, the precision of the tool holder and the clamp, the wear of the processing tool, the precision of the machine, and the like.

However, in the present invention, as shown in Figs. 3, 6, 9, and 10, the semi-cylindrical inclined projection 11-11 of the clamp 11 and the cylindrical inclined groove 10-2 of the tool holder 10 are shown. ) Is engaged with the inclination line 11-6 of the clamp 11, and has a structure that can rotate in the directions of G and G1, thereby completely solving the problems caused by the conventional apparatus. That is, under any of the above conditions, the hole formed in the center of the cutting insert along the lines of L and L1 shown in FIG. 2 and the protrusion of the clamp can be completely coincident with each center line.

The second difference is that the upper part of the cutting insert 20 and the lower part of Y and Y1 next to the protrusion 11-4 of the clamp 11 must be completely in contact with each other, as shown in FIG. The movement of the insert can be minimized. If there is a gap in any part, the cutting insert can move. In order to eliminate such a gap, the part (B) should be fixed by the clamp fixing bolt 103 accurately without any other variables based on the part (A). However, in the conventional apparatus, the surface contacting area of part (b) is wider than part (a), so that part (a) is determined based on part (b), and the tolerance of cutting insert, tool holder and clamp precision Due to problems such as wear of processing tools, precision of machine, etc., the lower part of Y, Y1 is difficult to be completely adhered to.

However, in the present invention, as shown in Figs. 3, 6, 9, and 10, the semi-cylindrical inclined projection 11-11 of the clamp 11 and the cylindrical inclined groove 10-2 of the tool holder 10 are shown. ) Is engaged with the inclined line (11-6) of the clamp 11 and has a structure that can rotate in the direction of G, G1, so that the insert center hole 20-1 and the protrusion 11-4 of the clamp 11 ) Coincides with each other in a line contact with each other, and a portion in which the semi-cylindrical inclined projection 11-5 of the clamp 11 and the cylindrical inclined groove 10-2 of the tool holder 10 are engaged. In line contact with the center line of the clamp 11, the clamp 11 is easily moved in the H, H1 direction. That is, either the clamp 11 protrusion 11-4 or the semi-cylindrical slope inclined portion 11-5 does not claim the reference point first. Afterwards, when the clamp fixing bolt 103 is tightened, the clamping bolt 103 has no reference point until the lower points of the Y and Y1 parts of the clamp 11 come into contact with the upper surface of the cutting insert 20. 11) despite the above-mentioned problems of the prior art on the basis of part (a), the cutting insert 20 can be precisely adhered to the (a) part.

The invention is applicable to the toolholder assembly industry of cutting tools.

Explanation of symbols on the main parts of the drawings
10. Toolholder 10-1. Spring recess 10-2. Cylindrical bevel groove 10-3.Clamp set screw
11. Clamp
11-1. Clamp Bore
11-2. Screw recess
11-3. Spring adapter
11-4. projection part
11-5. Semicircular Column Sloped Projection
11-6. Slope
20, cutting insert 20-1. Insert Central Hall
30. Sheet
40. Seat fixing bolt
103. Clamp Fixing Bolt
104. Compression Coil Spring
50.Inside pocket
60. Pocket bottom

Claims

Cutting insert with insert center hole in the center:
A tool holder having a wall portion and a pocket portion having a bottom surface on which the cutting insert is to be positioned, and a cylindrical recess groove for engaging the spring recess and the clamp to move the clamp;
Located in the upper part of the tool holder is inserted into the insert central hole of the cutting insert on one side, the protrusion is formed to pull and press the cutting insert toward the wall and the bottom, the other side is formed with a semi-cylindrical inclined projection, between the clamp bore Clamps formed to secure cutting inserts placed in the tool holder:
Clamp fixing bolt screwed to the tool holder through the clamp bore of the clamp to force the clamp:
And a compression coil spring positioned between the spring recess of the tool holder and the spring adapter of the clamp to generate an elastic reaction force on the clamp.

The method according to claim 1
The inclined angle of the semi-cylindrical inclined surface projection of the clamp is a cutting insert fixing device, characterized in that formed at an angle between 15-45 degrees relative to the protrusion of the clamp.