JP2878886B2 - Double threaded indexable insert - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a double threaded indexable insert and, more particularly, to an improved shape of a breaker which affects chip handling performance.

[0002]

2. Description of the Related Art In order to perform sufficient cutting with a thread cutting insert, chip processing must be improved. Therefore, chips do not become entangled with the work material,
Also, the chips must be parallel and away from the cutting part.

[0003] This is particularly important with multi-thread threaded throw-away tips. In the threaded indexable insert shown in FIG.
a, 15a for the plurality of cutting edges, from the side wall 16a to the side wall 17
A breaker having a smooth gradient toward a is provided, and a breaker wall behind the breaker is an upright shape having an angle θ or is formed of a partial surface of an elliptical sphere.

[0004] Also, a part of the intermediate surface (cut surface) in FIG.
A concave portion is provided in a portion corresponding to 11a to improve chip processing performance. When a work material 52 with a diameter of 30 mm made of material SCM435 is cut at a cutting speed of 100 m / min and Dry with a double threaded cutting insert 51 having components as shown in FIG.
Chips 53 as shown in FIG. 12 were generated. That is, FIG.
Fig. 12 (b) and Fig. 12 (b) show the condition of the cut 0.36mm, the cut 0.33mm (Total cut 0.69mm), and Fig. 12 (c) of the cut 0.27mm (Total cut 0.96mm). )
52 is chattered and chips 53 are involved.

[0005]

In the conventional thread cutting having the components as shown in FIG.
The chips generated from a, 14a, and 15a tend to be entangled with each other.
In particular, when the thread is cut by the radial infeed method, the chip discharge direction is not constant,
There were problems such as being involved in the holder.

[0006]

SUMMARY OF THE INVENTION In view of the above circumstances, the present invention has been made in consideration of the above circumstances, and in order to allow chips to flow in parallel without causing the chips to become entangled, a cutting material for a double threaded indexable insert is provided. A two-threaded threaded throw-away tip made of a substantially triangular flat thin plate comprising: a recessed portion 35 at the rear of the threaded cutting portion 13 that determines the final thread shape; clear step H ₁ provided, to provide a two-peak threading cutting insert forming a chip guide grooves 23 and 22 to the breaker walls 21, 24.

[0007]

[Action] The step H ₁ provided further chip guide grooves 23, 22
Is provided, the chips from the screw cutting blade 13 that determines the final thread shape advance to the chip guide groove 23 immediately behind the chip cutting groove, whereas the chips from the screw cutting blade 14 adjacent to the screw cutting blade 13 are provided. proceeds to chip guide groove 22 after the true along the wall surface of the step H ₁ in. Therefore, the chips go away from the workpiece without being tangled in parallel.

[0008]

BRIEF DESCRIPTION OF THE DRAWINGS The invention will be described in more detail hereinafter with reference to a specific embodiment illustrated in the accompanying drawings, in which: FIG. FIG. 1 shows the second embodiment of the present invention.
This is a threaded indexable insert. It consists of a substantially triangular flat thin plate made of a cutting material,
A lower surface 16 formed substantially parallel to the opposite side of the upper surface 15; and a plurality of side walls 17, 18, 19 disposed between the upper and lower surfaces 15, 16. An outwardly protruding blade 1 that is recessed downward with respect to the upper surface 15 by a joint between the blades 1
Reference numerals 3 and 14 denote sections formed.

FIG. 2 is an enlarged view of the distal end of the double threaded indexable insert of the present invention. The thread cutting edge 13 that determines the final thread shape among the plurality of cutting edges is shown in FIG.
, The angle η has a slope of 8 to 12 °. Blade 13
Has cutting edges 28 and 29 and primary cutting portions or lands 32 and 33 connected thereto. There is a concave portion 37 from the inside of the lands 32 and 33, followed by a concave portion 35 in a smooth shape following the rear portion.
A chip guide groove along the rear breaker walls 21 and 24 of the recess 35
23 are provided. The inclination angle γ of the chip guide groove 23 is set to 8 to 25 °.

[0010] Similarly to the above, the other thread cutting edge portion 14 has an angle η of 8 to 12 ° as shown in FIG. The blade 14 has cutting edges 26 and 27 and primary cutting portions or lands 30 and 31 connected thereto. There is a concave portion 36 from the inside of the lands 30 and 31, followed by the concave portion 34 in a smooth shape. The chip guide groove 22 is provided along the rear breaker walls 21 and 24 of the recess 34. The inclination angle ε of the chip guide groove 22 is set to 8 to 25 °.

As shown in FIG. 5, the breaker walls 21 and 24 have an angle β of 40 to 55 °.
The outwardly inclined angle α of the rear recesses 35 and 34 of the thread cutting blade 13 and the thread cutting blade 14 is −2 to −10 ° as shown in FIG. clear step portion 41 so that the level difference H ₁ is generated is provided, the level difference H ₁ is obtained by setting the H ₁ = 0.1 to 0.3 mm.

FIG. 7 is a sectional view of a continuous portion of the blade portion 13 and the blade portion 14. FIG. 8 is a sectional view of the land portion 30 of the blade portion 14. Figure
FIG. 10 is a perspective view of the double-threaded indexable insert of the present invention. This double threaded indexable insert 61
With the SCM435 material 62 with a diameter of 30 mm, a cutting speed of 100 m
When cutting at / min. Dry, chips 63 as shown in FIG. 10 were generated. That is, FIG.10 (a) is a cut 0.36mm, FIG.10 (b)
Is notched 0.33 mm (Total notch 0.69 mm), FIG.10 (c) is the notch 0.27 mm (Total notch 0.96 mm), the work material 62 does not have chatter, and the chip 63 is not entangled. Absent.

[0013]

According to the present invention, in the chip processing performance, chips generated from each screw cutting edge are hardly entangled, and chips can be stably processed in a certain direction. The use of the double threaded indexable insert of the present invention improves reliability compared to conventional products during automatic or unmanned machining.

[Brief description of the drawings]

FIG. 1 is a plan view of a double threaded indexable insert according to a specific embodiment of the present invention.

FIG. 2 is an enlarged plan view of the vicinity of a thread cutting edge in FIG. 1;

FIG. 3 is a sectional view taken along the line III-III of FIG. 2;

FIG. 4 is a sectional view taken along line IV-IV of FIG. 2;

FIG. 5 is a left side view of FIG. 1;

FIG. 6 is a sectional view taken along line VI-VI of FIG. 2;

FIG. 7 is a sectional view taken along line VII-VII of FIG. 2;

FIG. 8 is a sectional view taken along the line VIII-VIII in FIG. 2;

FIG. 9 is a perspective view of the double threaded indexable insert of the present invention.

FIG. 10 is a view showing a flow of chips by a double threaded indexable insert according to the present invention.

FIG. 11 is a plan view of a conventional multi-thread threaded throwaway tip.

FIG. 12 is a diagram showing a flow of chips by a conventional double threaded throw-away tip.

[Explanation of symbols]

 11a ... Intermediate surface (cutting surface) 12a ... Second chip forming surface (standing region) 13a, 14a, 15a ... Screw cutting edge 16a, 17a ... Sidewall 10 ... Cutting tool 11 ... Cutting corner 12 ... Chamfering 13, 14 ... cutting edge 15 ... upper surface 16 ... lower surface 17, 18, 19 ... side wall 20 ... central hole 21, 24 ... chip forming surface (standing area) 22, 23 ... chip guide groove 25 ... intermediate surface (cutting surface) 26, 27, 28, 29 ... Cutting edge 30, 31, 32, 33 ... Land part (primary cutting part) 34, 35 ... Depression 36, 37 ... First chip forming surface 38 ... Land 39, 40 ... Tip part η: acute angle β: acute angle α: acute angle γ: acute angle ε: acute angle

Claims (1)

(57) [Claims] 1. A two-way threaded indexable insert made of a substantially triangular flat thin plate made of a cutting material, wherein the thread is adjacent to a concave portion 35 at the rear of the threaded cutting portion 13 for determining the final thread shape. clear step H ₁ provided to the blade portion 14 rear of the recess 34, the chip guide grooves 23 and 22 to the breaker walls 21, 24
Threaded indexable inserts with a thread.