JPH0241812A - Chip for metal cutting round saw - Google Patents

Abstract

PURPOSE:To permit a beautiful cut face of good precision to be formed and a longer life to be stabilized by decreasing chipped scrap in width to the extent of passing through the first rake face so as to discharge the same which is curled after decreased greatly in width during outflow over the second rake face and a stage. CONSTITUTION:When a metal is cut by a round saw which has a chip 13 brazed in each cutting edge house 15 of a base metal 11, chipped scrap cut by the first rake face comes to be thin scrap in a center portion 13f and thick scrap created on both sides thereof. Then, 13f has low frictional force so that the scrap is less deformed and kept thin, and grater frictional force with approximating both sides so that the scrap is compressed and increased in thickness. Also, the scrap on both side portions is promoted to flow into the center portion, therefore right-and-left scrap content is decreased moderately. Additionally, the scrap, in the process of flowing over a recessed portion 13h and the second rake face 13b, has both wings lifted up by a high 13b on both sides, put on a stage 13g in the state of floating over 13h, and bent largely by a stage with rising circular arc in a cross direction to be curled. At this time, the scrap content is greatly decreased to facilitate bending and deformation for allowing deformation in crosswise uniformity.

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a carbide tip of a circular saw blade used for cutting ferrous and non-ferrous materials that are difficult to cut, and is particularly suitable for use with thin saw blades. Concerning carbide tips.

BACKGROUND ART When cutting a material with a commonly used chip dividing grooved blade, chips with different widths are generated on both sides of the groove, but the chips do not necessarily flow parallel to the cutting surface. For this reason, chips generally tend to protrude out of the glue thickness range at a distance of several centimeters or more from the cutting edge. Also, because the blade has chamfers on both sides, it is easy for chips to flow sideways, and when chips hit the cutting surface, they are thrown out by the cutting surface, caught between the cutting surface and the circular saw blade, and are crushed and torn off. Chips may adhere to the cut surface, impairing the precision and aesthetics of the cut surface. A cutting edge shape described in a rotary milling tool device disclosed in Japanese Patent Application Laid-Open No. 5,641,4613 (FIG. 13A) is known to improve this phenomenon of welding of chips that come into contact with a cut surface. Cutting off again? As a technology for turning inserts that perform R inserting, it is listed as a prior art in the specifications of Japanese Patent Application Laid-open No. 16903/1983 (Figure 13, opening and c) and Japanese Utility Model Application Publication No. 161902/1982 (Figure 13). The shape of the Sennobu's cutting edge has been similarly improved. Furthermore, when cutting difficult-to-cut materials, the temperature of the cutting edge increases due to high-speed cutting, and chips are welded to the rake face of the chip and the bottom of the blade chamber of the alloy, making the blade part 1 member unusable due to chips being trapped. To prevent such a welding phenomenon, the applicant previously proposed JP-A-62-2.
No. 77216 is known.

The first problem to be solved by the invention is that a rake face 2 is formed at the cutting edge of the chip I as shown in FIG. A wide rectangular recess 3 is formed, and the deep part of this recess is rounded and rises in the direction of the flow of chips, and continues to the chip breaker 4, depending on the depth of the bottom. The width becomes narrower. Bank portions 5 are formed on both sides of the four portions 3, and have the same upper width and varying depth. Second. The third one is almost the same.

When cutting with a milling cutter equipped with such a tip, chips of a size corresponding to the width of the chip are generated, and immediately after that, these chips are pushed into the inside of the recess 3 to form a shape corresponding to the shape of the fourth part 3. , deforms into the shape shown in FIG. 19, whereby the width of the chip becomes smaller than its width immediately after being cut out. In other words, the chips undergo two drastic deformations while flowing over a distance approximately equal to the chip contact length, and as a reaction, strong pressing force and frictional force act on the bank portion 5 forming the four parts 3, causing the bank portion 5 to reach a high temperature. becomes. Even without using cutting fluid, when the cutting edge is removed from the material to be cut, it receives the cooling effect of the air flow. In rotary cutting, a so-called thermal fatigue crack occurs in the bank portion 5 due to the repetition of such a 4-degree cycle of heating and cooling, and the problem is that the crack grows due to the pressing force and the chip becomes chipped. ing.

The fourth one, as shown in FIG. 15, forms a second rake face 7 following the first scoop 6, and then forms an upward step 8 having a large arcuate step.

However, the steel type of the material to be cut has a carbon content of o, io%.
The following steels and high chromium steel (SUS403.5US405
), or when the glue thickness T is small, especially when T≦2.5N, the chip width is small and it tends to wobble easily, and the chamfer width on the side of the cutting edge is smaller than the chip width. Since it is relatively large, chips tend to travel diagonally.

For this reason, there is a problem in that the chips generated on both sides of the chip dividing groove, which have a narrower back width, are particularly susceptible to welding.

Furthermore, it is necessary to supply a large amount of cutting fluid to prevent welding, and even if cutting fluid is supplied, welding of chips on the cut surface cannot be avoided if the cutting heat increases as the cutting edge wears. In addition, the use of cutting fluid tends to pollute the working environment, and since the chips are cooled by the cutting fluid, there are problems in that the life of the carbide tips is also impaired.

The present invention prevents welding of chips to the cutting surface, which often occurs with carbide-tip circular saw blades, especially when the glue thickness is 2.51 mm or less, in so-called dry cutting that does not use cutting fluid, and eliminates abnormalities. To provide a tip for a circular saw that does not cause thermal cracks or early chipping of the cutting edge due to growth, thereby obtaining a beautiful cut surface with good precision and having a stable and long life. Also, work material 20φ~100φ■■
Bar saw blade size of about 200 φ ~ 400 φ1-1 number of teeth 40 ~ 140, cutting conditions V -50 ~ 200 m/mi
An object of the present invention is to provide a tip for a circular saw blade that is particularly suitable for Sz = 0.05 to 0.15 -, which will be described later.

Means for Solving the Problems In order to achieve the above object, the carbide tip for a circular saw of the present invention has a negative first rake face covering the entire cutting width at the cutting edge tip of the rake face, and then In a Sennobu in which a recess for leading out chip deformation is formed in the center of the width of the face and a chip breaker is formed behind the second rake face, the recess has a substantially arc-shaped or V-shaped cross section and is located on the first rake face. The width of the central part where the length is the minimum is a fraction of the cutting edge width of the chip, and the first rake face on both outer sides thereof has a front end opening where the length gradually increases, and furthermore, the recess is in the center. A chip breaker having a constant width at the bottom and gradually deepening from the front end opening while keeping the cross-sectional shape of the bottom constant, the bank portions on both sides of the recess having an upward step that gradually increases in height following the second rake face, and the upward step. It is formed in a step portion following the concave portion, and both outer sides of the recess lift and deform both wings of the chips in the process of outflowing chips, thereby reducing the amount of chips 11. Furthermore, the dimensions of each part of the chip are such that the width of the center of the first scoop is S compared to the width of the chip cutting edge.
6≦0.20T, depth of the front end opening of the recess d-0.2 ~
Q, 5mm, Depth of rear end opening d2≧Q, 3mm
, the radius R of the arc of the upward step is 2 to 4 cm (second rake angle γ2 - first rake angle γ6)≧25''.

Function When cutting iron material with a circular saw with this chip brazed to the blade chamber on the circumference of the alloy, chips equal to the thickness of the chip are generated. In the process of flowing out from the first rake face, the left and right sides of the chips are drawn into the recess in the center, both wings are lifted and deformed, the width of the chips is reduced, and the chip width becomes smaller than the chip thickness, that is, the glue thickness. Since the width of the chips is reduced by lifting both wings of the chips while curling the chips, the chips are smoothly discharged without coming into contact with the cutting surface.

EXAMPLES Hereinafter, examples of the present invention will be explained based on FIGS. 1 to 6.

A large number of blade parts 12 are formed at equal intervals on the circumference of the base metal 11, and a part of the carbide tip I3 as a saw blade is embedded in the alloy and fixed to the blade part by brazing, and the saw blade rake surface The blade chamber 15 is shallowly cut into the tooth back part 14 with a smooth curve so that chips do not become deeply stuck in the solidification 15a and become difficult to discharge. The carbide tip 13 of this saw blade has a negative first tip at the top of the cutting edge in order to suppress cutting resistance and maintain blade strength.
A first rake face 13 of a plane with a rake angle T1″ and a length Sl
A and a second rake angle T2 following the first rake face 13a. A flat second rake face 13b with a length of $2 is created, and a stepped portion 13c that is one step higher is created following the second rake face 13b with a step 13g of an arcuate face with a radius R that becomes a chip breaker. Further, an outer diameter relief 13d having a relief angle γ is formed on the rear side of the first rake face 13a. Then, in order to prevent chipping at both ends of the width of the carbide tip 13, a chamfer 13e of size S is formed from the first rake face 13a to the outer diameter flank face 13d. Form Q. Solidification of blade chamber I5 1
5a is a concave surface from a position 83 points lower than the step of the stepped portion 13c, and has a smooth large curved surface with a blade chamber depth of Q, and rises at an angle θ with the second rake surface 13b, which is the tooth back portion 1 of the adjacent blade body 12.
Connected to 4.

The above is disclosed in Japanese Unexamined Patent Publication No. 62-277216, and the present invention forms a recess 13h in this type of chip. That is, the recess 13h is the first rake surface 13.
A tip opening is formed at a, the opening edge 13k is at the center, the length of the first rake face + 3fl (hereinafter referred to as negative land length) is a slight length S, and the width S6 of the flat surface 13i is slight, and both sides thereof. is bilaterally symmetrical, has a right-angled cross section, and has a circular arc with radius R0, and the tip opening has a convex circular shape or a similar circular shape. In other words, the negative land length of the opening 8113k is gradually increased on both sides of the central part.
The step portion 13 extends over the rake face 13b1 and the arcuate step 13g.
A rear end opening is formed at C. The bottom of the recess 13h is a flat surface 131. of the same width 86 from the first scooped blood central portion 13f to the second scooping surface side. The concave portion has a concave arc shape with an arc surface 13j having the same width S6 and a radius R1, and the depth of the concave portion becomes deeper sequentially toward the rear, and the depth d2 at the rear end is deeper than the depth d at the front end. and a flat surface 13i of the recess 13h.

A curved surface with a radius R0 is formed along both left and right sides of the arc surface 13j.

Furthermore, as another embodiment of the fourth part 13h, as shown in FIG. 7, a flat bottom surface 131. The arcuate surfaces on both sides of the arcuate surface 13j are linear surfaces, and the cross section has a chevron-shaped V shape. The angle (2) is preferably 90' to 120'.

Another embodiment of the four parts 13h shown in FIGS. 8 and 9 is that the arc surface 13J following the bottom flat surface 13i is eliminated, and the flat surface 13i and the arcs on both sides are extended as they are, so that the bottom surface of the chip 13 It opens to the public.

Furthermore, as another embodiment of the second rake 113b and the chip breaker, the step 13g of the circular arc shown in FIG.
It is made so that it is tangent to the arc of the circle.

m'
When cutting metal by attaching it to the blade, the chips cut by the cutting edge of the first scoop formed in a negative manner are thin chips at 13f in the center where the length of the negative land is narrow, and the chips on both sides are thick in proportion to the length of the negative land. Chips are generated. In the center part 13f of the first rake, the negative land length is narrow, so the frictional force is small and the chips are less deformed and remain relatively thin chips.On the other hand, on both sides of the flat part, the negative land length gradually becomes wider, so both sides The closer it is to the tip, the greater the frictional force between the chips and the chips, which compresses the chips and increases their thickness.

In addition, since the thin chips at the center of the four parts flow quickly, the chips on both sides encourage the behavior of the chips to flow toward the center. For this reason, the chip width on the left and right sides is reduced appropriately. When the length of the negative land changes rapidly, the action of drawing the chips on both sides towards the center becomes a sudden action corresponding to this, but the width 36 of the flat surface 13i of the fourth part 13h is narrow (both sides is formed by an R8 arc surface and the length of the negative land gradually increases from the center to both sides, so the retraction force is gentle and the chips do not press strongly against the inner surface of the groove during this process. .

Further, the chips are transferred to the subsequent concave portion 13h, the second rake surface 13
In the process of flowing over b, the high second rake faces 13b on both sides lift both wings of the chips, and the chips are applied to the step 13g in a floating state from the fourth part 13h, and the lifting force is large due to the action of the step of the upward arc. Bending and deforming the powder in the middle direction and curling it.

At this time, a large reduction in chip width occurs. At this time, since the thickness of the chip width center portion is thin, the chips are easily bent and deformed, and the chips are deformed evenly on both sides. The deformation process of this chip is the 1st I
The chip is in the state shown in FIG. 12 at the chip cross-sectional position shown in the figure. The chips in this figure have a diameter of 360mm, baking soda, and an iX blade thickness of 2.
Circular saw blade with 60 tips at 50m, diameter 80mm
O) 345 Cm was cut. Cutting conditions are V -110m/min, S z =0.10m
− is. The shape of the tip is similar to Sennobu ■ in Table 1 below.

Figure 12 (a) is the 11th [ff1o-0 position, where the chips have advanced 111 minutes from the cutting edge to almost contact, and the center part is pulled into the four parts 13h and a slight deformation is recognized, but both wings are in the first part. The rake face is parallel to and in close contact with the negative land surface of 1.32. (b) At the P-P position, due to the step 13g of the circular arc that serves as a chip breaker, as the chips flow, both A are lifted at an angle of about 4 inches, and the fourth part 13 rises above the step surface.
Only the shoulders of h are in contact. Then, due to bending and retraction, [11 dimensions were further reduced. (C) is the Q-Q position, and (D) is the R-R position, and it is clear that both wings are lifted at an angle of approximately 86 to 96 degrees and the chips are drawn toward the center. It is. Actual measurements confirmed that the left and right middle dimensions were smaller than the glue thickness by 0.11 m. During this period, the chips do not come into strong contact with the recess 13h and no friction occurs. With this saw blade, V = 110m/m
in, S z = 0.08 mm (7) diameter 3
Durable cutting of 2N 345C steel with continuous Vt 12,00
Even after cutting to zero, there will be no wear or cracks in any part of the recess.
No progress was observed. Furthermore, the state of chips under the same cutting conditions between the tip of the present invention and a conventional tip will be compared and explained.

Intermittent cutting of 5IOC steel using a cutting tool with each chip fixed to the shank by brazing or mechanical clamp, cutting speed V -113m/+win, S z = 0.0
The cutting conditions are 9 am.

Table 1 Table 2 In FIG. 19, which shows the cross sections of chips and chips at the chip contact stage of conventional chip A (Fig. 16, Fig. 17, Fig. 18, and Table 2) and chips of the present invention H and I, In A, at this stage, as the chips fall into the groove and deform as shown by the arrow, the width of the groove bottom becomes narrower, so an action to forcibly narrow the width of the chips occurs on the slope of the embankment, causing strong friction. occurs. On the other hand, in the case of chips H and I, the cross-sectional shape of the groove has a constant groove bottom shape and becomes wider as it gets deeper, so that strong friction does not act on the bank slope.

In addition, in Fig. 20 showing the cross-sectional shape of chips cut with inserts A, H, and I and the amount of reduction in chip width ΔT, in Fig. As shown in Figure 20 (b), the chips are squeezed out due to strong friction with the slope of the bank, creating whiskers. Since the frictional resistance when the chips flow out is large, the chips are compressed and become abnormally thick, and at the same time, the movement of the chips along the slope of the bank is inhibited and the width of the chips is sufficiently reduced. do not have.

As shown in FIG. 20 (C) for the chips of the present invention chip H and FIG. 20 (D) for the chips of the chip 1, the action at the chip contact stage is improved, and the subsequent chip flow process is improved. The width of the chip is also reduced by lifting and deforming both wings of the chip, which is almost a satisfactory value.

When cutting iron material with a circular saw in which the tip of the present invention is brazed to the blade chamber on the circumference of the alloy, chips with a width equal to the thickness of the chip, that is, the thickness of the glue, are generated in the entire contact area of the chips, and the left and right parts of the chips are in the center. It is pulled into the recess of the part and deformed, and as it is further pulled in, both wings are gradually lifted and deformed, the chip width is reduced and becomes smaller than the glue thickness, and it curls at the step and comes into harmful contact with the cut surface. It is ejected smoothly without any process. In addition, since the chips flowed out without causing strong friction with the chip surface, there was no localized thermal crank growth.

As a result of various experiments and prototypes, the width Sh of the first scooped blood central portion 13f, where the length of the negative land becomes small, is preferably 0.20 or less with respect to the cutting edge width T of the tip 13. In addition, the depth of the recess that draws the central part of the chip into the recess and gradually draws it deeper so that it does not touch the bottom is the depth dl of the opening on the cutting edge side, which is 0.2 to 0.3.
1■, the depth d2 of the rear end opening is preferably 0.4■■ or more so that it becomes gradually deeper toward the rear. The radius R of the arc of the step of the chip breaker is preferably 2 to 4 degrees.

The shape 4f dimensions of each part of the chip are as shown in Table 3.

Table 3 Z: Number of blades Although this tip is applicable to all types of metal cutting, the workpiece (20 φ to 100 φ 1 bar, saw blade size 200 φ to 400 φ small, blade thickness 40 to 100 mm) 140 pieces,
Cutting conditions V = 50-200m/lll1n, S
It is preferable that z = 0.05 to 0.15 mm.

Note that this tip is not limited to this embodiment, and can be widely used for cutting off and grooving, for example, for things that are expected to have similar effects.

Effects As detailed above, in claim 1.2 of the present invention, the width of the chips is appropriately frozen before passing the length Sl of the first rake face 13a, and the chips are cooled over the second rake face and the step. While flowing out, both wings were lifted and deformed, and the width was greatly reduced.
The chips are prevented from adhering to the cutting surface and the rake surface until they are curled, stored in the saw chamber, and discharged, and the cutting surfaces are prevented from becoming tM due to strong friction.

In particular, in claim 2, s, =0.05 to 0.12 Sb
By setting ≦0°20T, the deformation of the center portion of the chip width occurs evenly and relatively easily. The chips that have passed through the first rake face are lifted up by the shoulder of the recess and do not come into contact with the second rake face or the recess, generating less frictional heat, which greatly prevents damage due to 2g history, resulting in a particularly long chip life. .

[Brief explanation of the drawing]

Fig. 1 is a front view of the chip section, Fig. 2 is a side view of the same, Fig. 3 is a cross-sectional view taken along line A-A in Fig. 1, Fig. 4 is a cross-sectional view taken along line B-B in Fig. 3, and Fig. 5 is a cross-sectional view taken along line A-A in Fig. 3. The figure is a sectional view taken along the line C-C in Fig. 3, Fig. 6 is a sectional view taken along the line D-D in Fig. 3, Fig. 7 is a front view of the chip showing other shapes of the four parts of the chip, and Fig. 8 is a sectional view of the chip. 9 is a sectional view taken along line E-E in FIG. 8, and FIG. 10 is a front view showing another shape of the recess.
The figure is a side view of the 1000-knob showing other shapes of steps, Fig. 11 is a view of the 1000-knob shown in Fig. 1 showing the chip observation position, and Fig. 12 is a side view of the 1000-knob shown in Fig.
] Figure 13 is a perspective view of a conventional chip, Figure 14 is a sectional view of chips produced by the chip shown in Figure 13, and Figure 15 is a side view of a conventional chip. , Fig. 16 is a conventional thousand-knob diagram of the thousand-knob symbol A, and Fig. 17 is the 16th-knob diagram.
18 is a cross-sectional view of the V-V cotton etc. in FIG. 16; FIG. 19 is a cross-sectional view showing the relationship between chips and chips of the conventional type and the present invention; FIG. 20 is a cross-sectional view of chips produced by a conventional type chip and a chip according to the present invention. 3a 3b 3c 3f 3g ・First rake surface・Second rake surface・Step 13h・Recessed portion・First scooped blood center portion・Step 3i ・Flat surface 3j at the bottom of the recess ・Arc surface at the bottom of the recess

Claims (2)

[Claims] (1) The cutting edge of the rake face has a negative first rake face covering the entire width of the cutting edge, and a recess for deforming chips is formed in the center of the width of the second rake face at the rear thereof, and the second rake In a chip with a chip breaker formed after the surface,
The recess (13h) has a substantially arc-shaped or V-shaped cross section, and the width (S_6) of the center part (13f) where the length (S_1) of the first rake face (13a) is the minimum is the same as the chip (1).
3), and has a front end opening in which the length (S_1) of the first rake face (13a) on both outer sides of the first rake face (13a) gradually increases; ) has a constant width at the center bottom and is gradually deepened from the front end opening while keeping the cross-sectional shape of the bottom constant, and the bank portions on both sides of the recess (13h) have an upward step ( 13g) and a step (13c) following the upward step (13g), the metal is characterized in that it lifts and deforms both wings of the chips during the chip outflow process to reduce the chip width. Tip for cutting circular saw. (2) Width of the first rake face (13a) center part (13f) (
S_6) is S_6≦0.20T with respect to the cutting edge width T of the chip.
．． Depth of the front end opening of the recess (13h) d_1=0.2~
0.6 mm, the depth of the rear end opening d_2>0.3 mm,
The metal cutting circular saw tip according to claim 1, wherein the radius R of the arc of the upward step (13g) is 2 to 4 mm, and (second rake angle r_2 - first rake angle r_1)≧25°.