JPH0192006A - Throw away chip - Google Patents

Abstract

PURPOSE:To bevel the inner and outer edges of opening of a tubular work in single process by forming a recessed cutter section at a corner section or a side section of a throw-away chip body thereby increasing the number of cutters in the body. CONSTITUTION:A throw-away chip 1 is secured by fitting a fixing hole 4 to a pin 7 at a chip receiving section at the tip of a holder 6, and a work 5 is rotated around the horizontal axis. Then the holder 6 is entered into the opening of the work 5 and lifted in the direction of an arrow (i) in order to cut an end face 5a by means of a cutter at a corner section 4a. Upon finish of cutting of the upper face of the endface 5a, the holder 6 is stopped temporarily from lifting and faced with the end face 5a which has finished cutting of a recessed cutter section 3. Then the holder 6 is advanced with respect to the work 5 in order to bevel the inner and outer circumferential edges of the endface 5a simultaneously by means of both cutters 3a, 3a at the recessed cutter section 3.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to indexable tips that are discarded when worn out.

[Conventional technology]

Conventionally, this type of indexable tip has a triangular or rectangular plate shape, and is attached to a holder using a hole in the center, or, in the case of a tip without a hole, is attached to a holder with a clamp. used.

In the case of a square tip, the four cutting edges formed around each corner of the top surface can be rotated around the central axis and used in sequence, making it possible to cut the equivalent of four bits. In addition, in the case where cutting edges are formed on both the upper and lower surfaces, eight cutting edges can be used by turning the mounting surface over.

[Problem that the invention seeks to solve]

With conventional inserts, cutting edges are only formed at the corners, so chamfering requires numerous cutting steps, just like a normal cutting tool. For example, when chamfering both the inner and outer circumferences of the opening edge of a cylindrical workpiece, there are three steps.

That is, as shown in FIG. 11, first, the holder (d) with the rectangular tip (c) attached to the end surface (b) of the workpiece (a) is moved toward the rotation axis (Q) in the direction of the arrow ( e)
direction to cut the surface of the end face (b).

Next, the holder (d) is rotated with respect to the workpiece (,) in the direction of the arrow (f) intersecting the rotation axis (Q), and the workpiece is rotated.
--Proceed to step (a) and chamfer the inner peripheral edge (g) (see Figure 12).

Finally, move the holder (d) to the outside of the workpiece (a), advance it from the arrow (h) to the workpiece (a), and move the holder (d) to the outside of the workpiece (a).
(i) Chamfer.

As described above, the conventional indexable insert can only use the cutting edge at the corner, and therefore has the problem that machining takes time and costs are high.

[Means for solving problems]

The present invention aims to provide a throw-away tip that can reduce the chamfering process, etc., and is a throw-away tip that is removably attached to a tip receiving portion at the tip of a holder via a clamp. It is made of a polygonal plate or a disc, and has concave cutting edges at the corners or sides of the main body, which has cutting edges on the periphery.

[For production]

Concave cutting edge formed on the throw-away tip.

By using it in combination with the corner cutting blade, it is possible to chamfer the inner and outer edges of a cylindrical workpiece opening in one step, for example.

〔Example〕

A first embodiment of the present invention will be described based on FIGS. 1 to 6.

The indexable tip (1) made of super steel or ceramics is as shown by the imaginary line in FIG.

The four corners (2a) of a rectangular plate-shaped main body (2) having four sides are notched at right angles to form a concave blade part (3) forming an opening angle of 90 degrees, and a corner part that becomes a cutting edge at the opening edge of the concave blade part. (4a).

Each has a cross shape, and a mounting hole (4) is bored in the center.

As shown in FIG. 6, the corner (4a) has a relief angle (
α) is provided.

By providing such a concave cutting edge (3).

The throw-away tip (1) has eight corners (4a).

In addition, when both the upper and lower surfaces are used as cutting edges, 16 corners (4a) are formed.

Next, the end face (5a) of the cylindrical workpiece (5) shown in FIG.
) with the indexable tip (1) will be explained.

First, insert the mounting hole (4) of the throw-away tip (1).
The tip holder at the tip of the holder (6) is fixed by fitting into a clamp or pin (7) at the end.

The workpiece (5) is attached to a lathe and rotated around a horizontal axis.

The holder (6) is placed into the opening of the workpiece (5), raised further, and the end face (5a) is cut with the cutting edge of the corner (4a) (see FIG. 2).

Once the upper surface of the end surface (5a) has been cut to a predetermined depth, the holder (6) stops rising, and the concave blade portion (3)
is made to face the cut end face (5a).

Next, the holder (6) is advanced toward the workpiece (5), and the cutting edges of both pieces (3a) (3a) of the concave blade part (3) are
Both the inner and outer peripheral edges of the end face (5a) are chamfered at the same time.

FIG. 7 shows a second embodiment of the present invention, in which a rectangular main body (9) with a mounting hole (8) in the center has concave blade portions (10) with an opening angle of 68 degrees at the four corners. , respectively. This concave blade portion (10) is adapted to the chamfer angle of the workpiece.

Figure 8 shows a triangular plate-shaped body (11) with concave blades (12) formed at each corner, and Figure 9 shows a triangular plate-shaped body (13) with concave blades in the center of each side. This is another example of the indexable tip formed with (14).

Fig. 10 shows both sides of the disc-shaped main body (15).

This is a throw-away tip with a concave cutting edge (16) formed therein.

[Examples of odd forms]

In the above embodiments, all indexable tips are of the perforated type, but the present invention can also be applied to indexable tips without holes.

Further, the concave blade portion may not be provided on all corners of the indexable tip body, but may be provided only on a portion of the indexable tip body.

〔Effect of the invention〕

According to the present invention, by forming concave cutting edges on the corners or sides of the main body of the indexable tip, the number of cutting edges on the main body can be increased, and more versatile cutting operations can be performed.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway front view showing the cutting state of the indexable insert of the present invention, and FIGS. 2 to 4 are partially cutaway front views showing the steps of chamfering work in order. FIG. 5 is a plan view showing a first embodiment of the present invention, FIG. 6 is a longitudinal cross-sectional view taken along line VI-VI in FIG. 5, and FIG. 7 is a plan view showing a second embodiment of the present invention. FIGS. 8 to 10 are plan views showing other embodiments of the present invention, and FIGS. 11 to 13 are partially cutaway views showing step by step chamfering work using a conventional throw-away tip. It is a front view. (1) Throw-away tip (2) Main body (3) Concave blade (4a) Corner (4b) Side
(5) Workpiece (5a) end face
(6) Holder (7) Pin (8) Mounting hole (9) (11) (13) (15) Main body
(10) (12) (14) (16) Concave blade part (a
) Workpiece (b) End face (c) Chip
(d) Holder (g') inner periphery
(i) Outer periphery Figure 5 Figure 8 Figure 9 Procedural amendment (voluntary) Date of March 2, 1986 Kunio Ogawa Commissioner of the Patent Office 11. Display of the case 1986 Patent Application No. 2442302, Name of the invention Throw-away chip 3, Person making the amendment Relationship to the case Patent applicant name: Fuji Valve Co., Ltd. 4, Agent 5, Date of amendment order: Initiator 6. Number of inventions increased by amendment None 7. Subject of amendment Drawing 8. Contents of amendment

Claims (1)

[Claims] This indexable tip is removably attached to the tip receiving part at the tip of the holder via a clamp, and is made of a polygonal plate or disc and has a cutting edge on the periphery. A throw-away tip characterized by the provision of.