JPH01321115A - Cutting edge of band saw - Google Patents

Abstract

PURPOSE:To prevent stagnation of splash in a cullet part of each straight tooth and enhance the sideways rigidity of each set tooth by forming the pitch of those straight teeth, which do not undergo saw setting, greater than the pitch of the rightwise and leftwise set teeth. CONSTITUTION:When a work with a large cutting length is to be cut by a band saw, the cutting is commenced with straight teeth 7S, rightwise set teeth 3R, and leftwise set teeth 5L, and the straight teeth 7S make cutting in the cut-in direction while the set teeth 5L, 3R cut the left and right side-faces. Because the pitch Ps of the straight teeth 7S is greater than the pitches PL, PR of the leftwise and rightwise set teeth 5L, 3R, no splash will stagnate in the cullet of each straight tooth 7S, which prevents the saw from becoming blind. As the pitches PL, PR of these leftwise and rightwise set teeth 5L, 3R are made small relatively, the width accuracy is enhanced, the teeth equipped with enhanced sideways rigidity, and generation of cut-bends suppressed.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to a band saw blade used in a band saw machine for cutting workpieces such as various steel materials.

(Prior art) Conventionally, band saw blades used for band 1 generally have nine combinations: a right set tooth bent to the right, a left set tooth bent to the left, and a straight tooth that does not set. It is configured. Furthermore, the right set tooth, left set tooth, and straight tooth are formed at equal pitches.

(Problems to be Solved by the Invention) By the way, when cutting a workpiece whose cutting length is not very long using the band saw blade in which the above-mentioned right set tooth, left set tooth, and straight teeth are formed at equal pitches, for example, will not cause any trouble.

However, for example, when the cutting length of the workpiece is long (when the workpiece is large), chips accumulate in the gullet and cause clogging. Therefore, in order to prevent clogging, the pitch of each tooth must be increased,
When the pitch of each tooth is increased, there is a problem in that cutting bends are more likely to occur due to irregularities in the set teeth.

SUMMARY OF THE INVENTION An object of the present invention is to provide a band saw blade that prevents clogging and suppresses the occurrence of cutting bending, in order to improve the above-mentioned problems.

[Structure of the Invention] (Means for Solving the Problems) In order to achieve the above object, the present invention has a young set tooth bent to the right and a young set tooth bent to the left with respect to the cutting progress direction of the band saw blade. This band saw blade is constituted by a combination of a left setting tooth and a straight tooth that does not perform setting, and the pitch of the straight teeth is formed to be larger than the pitch of the left and right setting teeth.

(Function) By employing the band saw blade of the present invention, when a workpiece having a long cutting length is cut, cutting is started at each tooth tip. That is, the straight teeth scrape off the left and right sides in the cutting direction, and the left and right set teeth scrape off the left and right sides. Since the pitch of the straight teeth is larger than the pitch of the left and right set teeth, chips do not accumulate in the gullets of the straight teeth, preventing clogging. On the other hand, since the pitch of the left and right set teeth is relatively smaller than the pitch of the straight teeth, the direction of the width accuracy of the set teeth, E
By giving the teeth lateral rigidity, the occurrence of cutting bending can be suppressed.

(Example) Hereinafter, an example of the present invention will be described in detail based on the drawings.

Referring to FIGS. 1 and 2, when cutting a workpiece, the band saw blade 1 used in the band saw machine basically cuts in the direction of cutting into the workpiece (direction of arrow B in the first factor).
Right-hand digging 61i + 3R, which is bent to the right to cut the workpiece prior to cutting, left-hand filling @ 5L, which is bent to the left, and straight i, which does not cut to the left or right. [178], a total of three items are configured as one group (set).

The band saw blade 1 is driven to travel from left to right as shown by the arrow in Fig. 1, and the cutting order of each tooth is right counter tooth 3R.
, left set tooth 5L and straight m7s. That is, the right set tooth 3R is alternately set in front of the straight tooth 7S.
and left set teeth 5L are arranged in equal numbers on the left and right sides.

Said cloth setting tooth 3R, left setting tooth 5L and straight 1lI7
Let each pitch of S be PR, PL, and PS, and in this example,
PS>PR or PL; It was formed to satisfy the condition of PR-PL.

In addition, right set tooth 3R, left set tooth 5L and straight FA7
The tooth heights of S are respectively Hn, HL, and 1-1s, and in this example, Hs>HR or HL:HR=)
- It was formed to satisfy the conditions of IL.

With the above configuration, the pitch of each tooth of the band saw blade 1 is PS
＞PR or PL, and the tooth height of each tooth is HS＞HR
Or since it is 1-IL, the gulets [・
The size of the part is larger than that of the gullet part of the right set 6IiJ3R and the left set tooth 5L. Therefore, whereas in the past the gullet portions of the straight teeth 7S were clogged with chips, in this embodiment, the gullet portions of the straight teeth 7S are not filled with chips and clogging can be prevented.

On the other hand, the pitch PR or PL of the right set tooth 3R and the left set tooth 5L is PR or PL< with respect to the pitch ps of the straight tooth 7S.
PS, and as shown in Figure 2, the pitch of this actual flow example (solid line) is relatively smaller than the conventional pitch (dotted line), so the lateral rigidity when pushing from arrow C but,
This embodiment is larger than the conventional one, and the right set tooth 3R.

The accuracy of the set width on the left set tooth 5L is improved. Therefore, the occurrence of cutting and bending can be prevented, and cutting and bending can be prevented.

Therefore, by preventing clogging of cutting chips on the straight teeth 7S and suppressing the occurrence of cutting bends that are likely to occur in the right set teeth 3R and left set teeth 5L, the bandsaw blade 1 can be The cutting accuracy can be improved and the life of the band saw blade 1 can be extended.

Note that the present invention is not limited to the embodiments described above, and can be implemented in other embodiments by making appropriate changes.

[Effects of the Invention] As can be understood from the above description of the embodiments, the present invention provides a band saw blade in which the pitch of the straight teeth is larger than the pitch of the left and right set teeth. When cutting a workpiece, cutting chips do not accumulate in the gullet part of the straight teeth, which prevents clogging. At the same time, the lateral rigidity of each set tooth increases, and the width accuracy of the set tooth improves. , it is possible to suppress the occurrence of cutting bends that tend to occur in set teeth and prevent cutting bends.

Therefore, the cutting accuracy of the cutting process using this band saw blade can be improved, and the life of the band saw blade can be extended.

[Brief explanation of the drawing]

FIG. 1 is a front view of a part of a band saw blade which is an embodiment of the present invention, and FIG. 2 is a bottom view of FIG. 1. 1...Band saw blade 3R...Right set tooth 5L...Left set tooth 7S...Straight tooth PS, PR, PL...Pitch of each tooth

Claims (1)

[Claims] With respect to the cutting direction of the band saw blade, the band saw blade is composed of a combination of a right set tooth bent to the right, a left set tooth bent to the left, and a straight tooth that does not set out. A bandsaw blade characterized in that the pitch of the teeth is larger than the pitch of the left and right set teeth.