JP3053977U - Metalworking tip saw - Google Patents

Abstract

(57) [Summary] [Problem] With a conventional metalworking tip saw, there is a limit in improving the life of cutting ability due to clogging or the like. Kind Code: A1 A metal cutting tip saw having a circular saw body attached with a cutting edge tip, wherein the cutting edge tip has a large projecting dimension group tip having a large cutting edge projecting dimension and a cutting edge projecting dimension. It is divided into small small protrusion size group chips. For example, in the case of an outer diameter of 305 mm and a number of blades of 80, continuous 40 cutting edge tips are set as a large projecting dimension group chip, the cutting edge projecting dimension is 0.4 mm, and the remaining cutting edge tips are small projecting dimensions. When the same size was set to 0.2 mm as a group chip and a cutting test was performed, the number of times of cutting was increased to about 10 times as compared with about 100 times using a conventional chip saw.

Description

[Detailed description of the invention]

[0001]

[Technical field to which the invention belongs]

 The present invention relates to a metal cutting tip saw having a circular saw body and a cutting edge tip attached thereto.

[0002]

[Prior art]

 Today, metal saw circular saws are often used with saw blades made of cemented carbide or cermet alloy, especially those with cermet cutting blades. When it is used for cutting, it has various excellent advantages such as being able to cut faster and sharper than cutting with a grindstone.

[0003]

[Problems to be solved by the invention]

 However, in the conventional tip saw, the life of the cutting ability is still short, and it has to be frequently replaced during the operation, so that a major problem remains that the running cost is very high. For example, when using a tip saw with an outer diameter of 305 mm, which is the most common size today, and cutting an iron angle material with a thickness of about 5.5 mm and a width of about 50 mm, the number of cuts that can be cut with one tip saw The limit was at most 100 times.

One of the causes of a decrease in cutting ability of a circular saw such as a tip saw is that clogging by cutting chips promotes overheating and causes annealing, thereby promoting the progress of wear. It is believed that there is.

[0005] The present invention has been made in view of the above-mentioned conventional problems, and provides a metalworking tip saw that can reduce the progress of wear of the cutting blade and greatly extend the life of the cutting ability. The purpose is to provide.

[0006]

Means for Solving the Problems In order to achieve this object, a metalworking chip saw according to the present invention is a metalworking chip saw having a large number of cutting blade tips attached to a circular saw main body. The cutting tip is made up of a large protruding dimension group in which a predetermined number of cutting tips having a predetermined protruding dimension are continuously arranged, and a cutting protruding tip included in the large protruding dimension group. It is divided into small protruding dimension groups in which a predetermined number of cutting edge tips having a predetermined smaller dimension are continuously arranged.

For example, in a tip saw having 80 blades, the cutting edge protruding dimension of the continuous 40 cutting edge chips (large protruding dimension group) is set to 0.4 mm, and the remaining 40 As a result of a cutting test of the cutting edge tip (small protrusion dimension group) having the same dimension of 0.2 mm, the life of the cutting ability was extended from about 5 times to about 10 times as compared with the conventional product.

[0008] Although it is not always clear what is the main factor behind such astounding results, the fact that the progress of the wear of the cutting blades was observed one by one indicates that at first the cutting edge protruded. Only the larger sized inserts (larger sized inserts) contribute to the cut and the other inserts remain inactive, and then when the cutting edge wears out and no longer contributes to the cut, It was found that only the chips with small cutting edge protrusion dimensions (chips in the small protrusion dimension group) contributed to cutting. In view of this, in the insert saw according to the present invention, since inserts having approximately half the number of blades that are provided work sequentially, clogging hardly occurs and a state in which overheating is not promoted is maintained for a long time. It seems to be.

In implementing the present invention, specific values of the cutting edge protrusion dimensions in the large protrusion dimension group and the small protrusion dimension group, the difference between these two types of cutting blade protrusion dimensions, or two types of It is not possible to stipulate how much the ratio and number of groups should be set, but the following were confirmed from the results of numerous cutting tests performed on prototypes by the present inventors. That is, it seems to be effective that the difference between the large and small cutting edge protrusion dimensions is more than 0.1 mm and less than 0.5 mm, and that the effect is small if it is larger or smaller.

The ratio between the large protrusion size group and the small protrusion size group seems to be best when the ratio is half. It is considered that the sharpening angle of the cutting edge is desirably 0 °, but it is considered that a sharpening angle common to this type of tip saw, for example, about 0 ° or more and about 5 ° to 10 ° may be used. Furthermore, with regard to the cutting edge tip between the tip of the large projection dimension group in the rotation direction and the small projection dimension group, if the cutting edge projection dimension is set to a size approximately halfway between the two large and small dimensions, the initial impact can be reduced. It was found to be effective.

[0011]

[Embodiment of the invention]

 DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A metalworking chip saw 1 according to an embodiment of the present invention will be described below with reference to the drawings. This tip saw 1 is composed of a circular saw main body 3 and a number of cutting blade tips 9. The circular saw main body 3 is formed of a hard metal into a disk shape, and is provided at its outer peripheral edge with a plurality of notches 5 having a substantially U-shape at a constant pitch in the circumferential direction, thereby being arranged at equal intervals in the same direction. A large number of bases 7 are formed.

The cutting edge tip 9 is formed in a rectangular plate shape using a cermet alloy or the like, and is rotated in one side surface of each base metal 7 (the arrow with a width in the figure indicates the tip saw 1 during use). (Indicating the direction of rotation).

The protruding dimension L of the cutting blade 11 of the cutting blade tip 9 (L1 to L3 in FIG. 2), that is, the dimension protruding from the leading edge 7a of the base 7 to the side opposite to the center c of the circular saw main body 3. L is not constant, and a large protruding dimension group in which a predetermined number of cutting edge tips 9 having predetermined protruding dimensions are continuously arranged, and a cutting edge protruding from the cutting edge tips 9 constituting the large protruding dimension group. The cutting edge tips 9 having a small dimension are arranged in a small projecting dimension group in which a predetermined number of cutting tips 9 are continuously arranged. In order to know the preferred form of the two groups and the size of the protruding dimension L for each group, the present inventors proposed that the circular saw body 3 has an outer diameter of 305 mm and 80 blades. The prototypes of 20 types shown in Tables 1 to 4 were tested.

[0014]

[Table 1]

[0015]

[Table 2]

[0016]

[Table 3]

[0017]

[Table 4]

The five types from A-1 to E-1 shown in Table 1 have a cutting edge protruding dimension L1 of 0.4 mm in the large protruding dimension group, and have a cutting edge protruding dimension L1 of 0.4 mm in the small protruding dimension group. The protruding dimension L2 of the cutting edge was set to 0.2 mm (the difference between the sizes is 0.2 mm). For the five types from A-2 to E-2 shown in Table 2, the protruding dimension L1 of the cutting edge is 0.5 mm in the large protruding dimension group, and the protruding edge of the cutting edge is 0.5 mm in the small protruding dimension group. The dimension L2 was set to 0.2 mm (the difference in size was 0.3 mm).

The five types from A-3 to E-3 shown in Table 3 have a cutting edge protruding dimension L1 of 0.6 mm in the large protruding dimension group, and have a cutting edge protruding dimension L1 of 0.6 mm in the large protruding dimension group. The protruding dimension L2 of the cutting edge was set to 0.2 mm (the difference between the sizes is 0.4 mm). In the five types from A-4 to E-4 shown in Table 4, the protruding dimension L1 is set to 0.6 mm in the large protruding dimension group, and the protruding edge is set in the small protruding dimension group. The dimension L2 is set to 0.15 mm (the difference in size is 0.45 mm). The above dimensions are set values, and some actual plus / minus errors are unavoidable as actual dimensions.

In addition, as a group division form (see FIG. 3), only one of all 80 cutting edges has a dimension L3 which is substantially intermediate between L1 and L2, and the remaining cutting edges have the following dimensions. A to E were classified into five forms. For the A type, 15 (about 20%) with a large protrusion L1 and 64 (80%) for the small protrusion L2, and for the B type, 31 with a large protrusion L1 (Approximately 40%) and 48 with small protrusion L2 (60%). For C type, 39 with large protrusion L1 (about 50%) and small protrusion L2 The number was 40 (50%). In the case of the D type, 47 pieces (about 60%) with the large protrusion L1 are used, and 32 pieces (40%) in the small protrusion L2, and in the E type, 63 pieces with the large protrusion L1 are used. Pieces (about 80%) and 16 pieces (20%) having a small protrusion dimension L2.

In these 20 types of tip saws and tip saws prototyped for a comparative test described later, the sharpening angle of the cutting edge 11 (see FIG. 5) was set to 0 ° except for a part.

[Cutting Test] Each of the 20 types of tip saws 1 was subjected to a cutting test. This cutting test was performed by using a cutting machine 13 shown in FIG. 6 to cut an iron angle material W having a width of 50 mm and a thickness of 5.5 mm. The cutting machine 13 includes a support shaft 17 attached to a base 15, an arm 19 rotatably supported on the support shaft 17 in a substantially vertical direction, a handle 21 fixed to the arm 19, and a not shown. A motor, a work chuck mechanism 23, and the like are provided. The tip saw 1 is detachably attached to the rotating shaft 25 of the motor, and the work W held by the work chuck mechanism 23 is cut by pushing down the handle 21. It has become. The rotation speed of the cutting machine 13 is about 3400 rpm.

In this cutting test, the number of times that each of the prototype tip saws 1 was able to cut (the number of possible cuts) is also shown in Tables 1 to 4. Based on these results, the life of the cutting ability of the prototype tip saw 1 was increased by about 4 to 10 times compared to the life of the cutting ability of the conventional tip saw (about 100 times).

There are several possible reasons for obtaining such good results, but it is considered that the main cause is that the progress of wear of the cutting edge 11 is suppressed. In order to confirm this, the wear state of the cutting blade 11 with the progress of the number of cuts of the C-1 type tip saw 1 was sequentially observed, and the tendency of wear progress shown in FIG. Was. According to this, the progress of wear of the cutting edge 11 starts, as expected, from a region () closer to the leading end in the rotation direction in the large protrusion dimension group, and shifts to the remaining region () of this group chip. Then, after moving to a region () on the opposite side to the rotation direction in the small protrusion size group, the process proceeds to the remaining region (,) in the small protrusion size group.

Looking at the progress of the wear, at first, only the tip having a large cutting edge projection size contributes to the cutting and the other tips hardly work, and then the cutting edge wears out and cuts. When it does not contribute to the cutting, it turns out that only the chip with the small cutting edge protrusion size contributes to the cutting. Considering this fact, in the insert saw according to the present invention, inserts having approximately half the number of blades that are provided work sequentially, so that clogging is unlikely to occur and overheating is not promoted for a long time. Therefore, it seems that annealing does not occur.

[Comparative test 1 Comparative test in which the difference in the size of the cutting edge protrusion is reduced] With respect to a tip saw having a diameter of 305 mm and a number of blades of 80, the cutting edge protrusion of 50% of the cutting blade tips is set to 0.4 mm. A comparative product was manufactured by setting the protruding dimension of the remaining cutting tip to 0.3 mm (therefore, the difference in the protruding dimension of the cutting edge was about 0.1 mm), and a cutting test was performed. As a result, the number of cuts is only 115, and the service life seems to be slightly longer than that of the conventional one, but the effect is small compared to the prototype C type. This is because the difference between the cutting edge protrusion dimensions L1 and L2 is too small, and both the large protrusion dimension group and the small protrusion dimension group contribute to cutting at the same time, and the clogging prevention effect is not improved. I suspect that it was.

[Comparative test 2 Comparative test in which the difference in the size of the cutting edge protrusion is increased] With respect to a tip saw having a diameter of 305 mm and a number of blades of 80, the cutting edge protrusion of 50% of the cutting blade tips is set to 0.6 mm. A comparative product was manufactured by setting the protruding dimension of the remaining cutting tip to 0.1 mm (therefore, the difference in the protruding dimension of the cutting edge was about 0.5 mm), and a cutting test was performed. As a result, the number of cuts was stopped at 120 times, and the life was slightly extended as compared with the conventional one, but the effect was small compared with the prototype C type or the like. In addition, there was a problem with this comparative product that the initial impact was large.

[Comparative Test 3 Comparative Test Regarding the Presence or Absence of an Intermediate Dimension Blade] Regarding the impact caused by the difference in the protrusion dimensions, a C-1 type tip saw without the intermediate protrusion dimension L3 (therefore, the large The protruding dimension group is 40) and a comparison was made. As a result, although the impact was slightly large at the beginning of cutting, there was almost no difference in cutting life even when the intermediate dimensions were not provided. However, since it is certain that the provision of this intermediate dimension can alleviate the impact, if the cutting edge insert is divided into multiple large groups and small groups, it is also possible to provide all intermediate dimensions at the boundary of the group. Conceivable.

[Comparative Test 4 Comparative Test Regarding Rotational Speed] The same thing as the prototype C type was mounted on a cutting machine having a rotational speed of 4300 rpm, and the same cutting test was performed. And a life close to the life of the prototype C type was obtained. Since the rotation speed of 3400 to 4300 rpm is a general rotation speed in today's cutting machine, it is considered that there is little difference depending on the rotation speed as long as the normal use is made.

[Comparative Test 5: Comparative Test for Continuous Change in Projection Length] With respect to a tip saw having a diameter of 305 mm and a number of blades of 80, the comparative product was set to 0.4 mm and 0.2 mm every other edge of the cutting blade. It was manufactured and a cutting test was performed. As a result, almost no cutting was possible.

[Comparative Test 6 Comparative Test Regarding Sharpening Angle] With respect to the C type tip saw, a cutting test was performed by setting the sharpening angle α (see FIG. 5) of the cutting edge 11 of the cutting edge tip 9 to approximately 10 °. However, the number of cuts increased to 554. Therefore, it seems that the sharpening angle is desirably 0 °, but it is considered that even if the sharpening angle is about 5 ° to 10 °, there is a certain effect.

As is clear from the results of the above cutting test and comparative test, the life of the cutting ability of the tip saw 1 according to the present invention is about 4 to 10 times that of the conventional tip saw. And some of them are about twice as good. In particular, in the case of the C type, it is possible to obtain an extension about 10 times that of the conventional type.

In view of the results of the comparative test, it is considered effective that the difference in the size of the protrusion of the cutting edge is in the range of about 0.1 mm to 0.5 mm. Then, it seems that the ratio between the group having the large cutting edge protrusion size and the group having the small cutting edge is preferably half, and in this case, it is better to set each group one by one.

In each of the above tests, the number of the large protrusion size groups and the number of the small protrusion size groups were each one, and no trial production or test was performed for other forms, but the life of the cutting ability seems to be extended. Then, it is conceivable to divide the cutting tip into four or more in the arrangement direction, and to arrange a plurality of large protruding dimension groups and a plurality of small protruding dimension groups alternately.

Although the embodiment of the present invention has been described in detail above, the specific configuration is not limited to this embodiment, and the design may be changed without departing from the gist of the present invention. Is also included in the present invention. In particular, the outer diameter and the number of blades of the tip saw to which the present invention can be applied are not limited to those shown in the embodiment, and the protruding dimensions L1 and L2 of the cutting blade and the difference between them are the values shown in the embodiment. It is not strictly limited to. Further, it is conceivable to provide one or several small protrusion groups smaller than the protrusion size of the group in the large protrusion size group or the small protrusion size group, and such a form is also included in the present invention.

[0036]

[Effect of the invention]

 As described above, according to the tip saw for metalwork of the present invention, the life of the cutting ability can be greatly extended.

[Brief description of the drawings]

FIG. 1 is an overall side view of a chip saw for metalwork according to an embodiment of the present invention.

FIG. 2 is an enlarged side view of a main part showing three large, medium and small cutting edge tips having different cutting edge protrusion dimensions in the metalworking tip saw shown in FIG.

FIG. 3 is a diagram showing five examples of grouping with different cutting edge protruding dimensions in the metalworking tip saw according to the present invention.

4 is a view showing the order of progress of wear observed for the C type tip saw shown in FIG. 3;

FIG. 5 is an enlarged perspective view of one of the cutting blade tips provided on the tip saw shown in FIG. 1;

6 is a perspective view showing a cutting machine used for a cutting test for each type of tip saw shown in FIG. 3 and another tip saw as a comparative product.

[Explanation of symbols]

 1 Tip Saw 3 Circular Saw Body 9 Cutting Edge Tip 11 Cutting Edge L Cutting Edge Projection Dimension

Claims (7)

[Utility model registration claims] 1. A metal cutting tip saw comprising a plurality of cutting blade tips attached to a circular saw main body, wherein the plurality of cutting blade tips are arranged in a predetermined number of cutting blade tips having a predetermined cutting blade protrusion dimension. Are divided into a large protruding dimension group and a small protruding dimension group in which a predetermined number of cutting edge tips having a predetermined smaller protruding dimension are continuously arranged from the cutting edge chips constituting the large protruding dimension group. A metal cutting tip saw. 2. The metal cutting tip saw according to claim 1, wherein the cutting edge projecting dimension of the cutting edge tip located between the cutting edge tip at the leading end in the rotation direction and the small projecting dimension group in the large projecting dimension group is determined. A metalworking chip saw characterized in that the projecting dimension is approximately intermediate between the projecting dimensions of the large and small. 3. The metal cutting tip saw according to claim 1, wherein the difference between the cutting edge protrusion size in the large protrusion size group and the cutting blade protrusion size in the small protrusion size group is more than 0.1 mm and 0.5 mm. A chip saw for metalwork, characterized by being less than. 4. The metal cutting tip saw according to claim 1, wherein the protruding dimension of the cutting edge in the large protruding dimension group is set to a value from 0.3 mm to 0.4 mm. Metalworking tip saw. 5. The metalworking chip saw according to claim 1, wherein the ratio of the large protrusion size group to the small protrusion size group is approximately one to one. 6. The metal cutting tip saw according to claim 1, wherein the outer diameter of the circular saw main body is a 305 mm type. 7. A metal cutting tip saw according to claim 1, wherein the sharpening angle of the cutting edge tip is set within a range of 0 ° to 10 °.