A replaceable blade

Abstract

The present application relates to a replaceable blade, wherein the bottom of the replaceable blade is provided with a center positioning groove and a positioning surface, and the middle of the replaceable blade is provided with two screw holes symmetrically arranged relative to the center line of the replaceable blade, and the characteristics are: two circumferential cutting edge bands, one large and one small, are arranged on both sides of the upper part of the replaceable blade, wherein the large circumferential cutting edge band is located in front and the small circumferential cutting edge band is located in the back, and two S-shaped center back blade surfaces are symmetrically arranged in the middle of the top of the replaceable blade, and a transverse blade vertex angle is formed between the two center transverse edges, and the size of the transverse blade vertex angle is between 90° and 160°, and the large circumferential cutting edge band, the small circumferential cutting edge band, the S-shaped center back blade surface, and the main cutting edge are all symmetrically arranged relative to the center line of the replaceable blade. The present application has strong centering ability and good stability during drilling.

Description

Technical Field

[0001] The present application relates to a replaceable blade, which is mainly suitable for drilling work in the mechanical processing industry. Background Art

[0002] The discarded tools that replace ordinary twist drills in the current market are divided into tool holders and blades. The blades use existing standard drill tips. Under normal conditions with medium cutting resistance, the cutting is relatively stable and the cutting effect is good. However, when the equipment power is insufficient or the drilling conditions are unstable, it is easy to produce unstable cutting conditions, thus affecting the processing quality. Summary of the invention

[0003] The technical problem solved by the present application is to overcome the above-mentioned deficiencies in the prior art and to provide a replaceable blade with strong centering ability and good stability during drilling.

[0004] The technical solution adopted by the present application to solve the above-mentioned technical problems is: a replaceable blade, wherein a center positioning groove and a positioning surface are provided at the bottom of the replaceable blade, and two screw holes symmetrically arranged relative to the center line of the replaceable blade are provided in the middle of the replaceable blade, wherein two circular cutting edge bands, one large and one small, are provided on both sides of the upper part of the replaceable blade, wherein the large circular cutting edge band is located in the front and the small circular cutting edge band is located in the rear, and two S-shaped center back blade surfaces are symmetrically arranged in the middle of the top of the replaceable blade, and a transverse blade vertex angle is formed between the two center transverse blades, and the size of the transverse blade vertex angle is between 90° and 160°, and the large circular cutting edge band, the small circular cutting edge band, the S-shaped center back blade surface, and the main cutting edge are all symmetrically arranged relative to the center line of the replaceable blade. The present application improves balance and stability by symmetrically arranging the above-mentioned circular cutting edge band, S-shaped center flank, center transverse edge, and main cutting edge relative to the center line of the replaceable insert; the mutual cooperation of two large and small circular cutting edge bands improves the orientation and stability capabilities of the present application; the S-shaped center flank can reduce drilling resistance, improve cutting heat at the center transverse edge, reduce displacement and improve centering ability; the transverse edge top angle is between 90° and 160°, which can enhance centering force and improve drilling stability.

[0005] The replaceable blade of the present application is provided with two arc-shaped concave cutouts on the front and rear sides of the upper part, which can play a role in chip separation and increase the strength of the cutting edge.

[0006] The replaceable blade of the present application is provided with large arc cross-edge grinding on both sides of the upper part, which is symmetrically arranged with respect to the center line of the replaceable blade, so as to improve the chip removal ability, reduce the axial force and torque, and enable better chip removal during large feed.

[0007] The replaceable blade of the present invention is provided with two chip breaker grooves symmetrically arranged with respect to the center line of the replaceable blade on the front and rear side corners, which can control the shape of the iron chips, reduce the volume of the iron chips, and facilitate chip removal. The head of each chip breaker groove is provided with a negative chamfer of the cutting edge, the width of the negative chamfer of the cutting edge is between 0.05 and 0.5 mm, and the angle of the negative chamfer of the cutting edge is between -10° and -60°, which can improve the strength of the cutting edge and increase the life of the tool.

[0008] Two chip grooves symmetrically arranged relative to the center line of the replaceable blade are arranged in the middle of the upper part of the replaceable blade of the present application. The two symmetrically arranged chip grooves are convenient for discharging the chips generated by the center chisel edge and have good stability.

[0009] Compared with the prior art, the present invention has the following advantages and effects: strong centering ability and good stability during drilling. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 It is a front view of an embodiment of the present invention.

[0011] Figure 2 for Figure 1 AA view of the chamfered edge structure.

[0012] Figure 3 for Figure 2 Enlarged schematic diagram of point B in the middle.

[0013] Figure 4 for Figure 1 Top view of the .

[0014] Figure 5 for Figure 1 Left view of .

[0015] Figure 6 It is a directional stereoscopic schematic diagram of an embodiment of the present invention.

[0016] Figure 7 for Figure 6 Partial view in the F direction.

[0017] Figure 8 for Figure 1 D-direction view.

[0018] Fig. 9 for Figure 8 Partial view at E.

[0019] Fig.10 This is a three-dimensional schematic diagram of another direction of the embodiment of the present application.

[0020] In the figure: center positioning groove 1, screw hole 2, circumferential cutting edge band 3, large circumferential cutting edge band 31, small circumferential cutting edge band 32, arc pit cut 4, chip groove 5, positioning surface 6, chip breaker groove 7, cutting edge negative chamfer 8, S-shaped center back cutting edge 9, chisel edge top angle θ, cutting edge negative chamfer angle α, replaceable insert center line 10, large arc chisel edge grinding 11, center chisel edge 15, main cutting edge 16, replaceable insert base surface 17 (the base surface refers to the plane passing through the selected point of the cutting edge and perpendicular to the cutting direction). DETAILED DESCRIPTION

[0021] The present application is further described in detail below with reference to the accompanying drawings and examples. The following examples are explanations of the present application and the present application is not limited to the following examples. The directions described in the present application are relative to Figure 1 Speaking of.

[0022] See also Figures 1 to 10 The embodiment of the present application is a replaceable blade: a center positioning groove 1 and a positioning surface 6 are provided at the bottom of the replaceable blade, and two screw holes 2 symmetrically arranged relative to the center line of the present embodiment are provided in the middle of the replaceable blade. The center positioning groove 1, the screw hole 2 and the positioning surface 6 are used for positioning connection with the knife rod.

[0023] The embodiments of the present application mainly include the following design points:

[0024] The replaceable blade of the present application is provided with two circumferential cutting edge bands 3, one large and one small, on both sides of the upper part. The large circumferential cutting edge band 31 is located at the front (located in front of the cutting direction) and has a guiding function; the small circumferential cutting edge band 32 is located at the back (located at the back in the cutting direction) and has a supporting function; when the hole is drilled through or there is a through-hole, the drill bit will deviate, and the small circumferential cutting edge band 32 can stabilize the drill bit.

[0025] The replaceable blade of the present application is provided with two arc-shaped concave cutouts 4 on the front and rear sides of the upper part, which can play a role in chip separation and increase the strength of the cutting edge.

[0026] Two symmetrically arranged chip grooves 5 are provided in the middle of the upper part of the replaceable insert of the present application. The two symmetrically arranged chip grooves 5 facilitate the discharge (the discharge directions are opposite and not easy to interfere with each other) of the chips generated by the center chisel edge 15 and have good stability.

[0027] The replaceable blade of the present application is provided with two chip breaker grooves 7 symmetrically arranged with respect to the center line 10 of the replaceable blade on the front and rear side corners, which can control the shape of the iron chips, reduce the volume of the iron chips, and facilitate chip removal. The head of each chip breaker groove 7 is provided with a negative chamfer 8 at the cutting edge, and the width L of the negative chamfer 8 at the cutting edge is between 0.05 and 0.5 mm, and the angle α of the negative chamfer 8 at the cutting edge (the angle between the base surface 17 and the negative chamfer 8 at the cutting edge) is usually between -10° and -60°, which can improve the strength of the cutting edge and increase the life of the tool.

[0028] Two S-shaped center flanks 9 and two center chisel edges 15 are symmetrically arranged in the middle of the top of the replaceable blade of the present application. The S-shaped center flanks 9 can reduce the drilling resistance and improve the cutting heat at the center chisel edge 15. The two center chisel edges 15 form a chisel edge top angle θ, which reduces displacement and improves the centering ability.

[0029] The replaceable blade of the present application is provided with a chisel edge vertex angle θ in the middle of the upper part, and the chisel edge vertex angle θ is the angle between the two center chisel edges 15 (see Figure 6 ). The value of the top angle θ of the chisel blade is between 90° and 160°, and the more optimized range of the top angle θ of the chisel blade is between 120° and 150°, which can enhance the centering force and improve the drilling stability.

[0030] The replaceable blade of the present application is provided with large arc transverse edge grinding 11 symmetrically arranged relative to the center line 10 of the replaceable blade on both sides of the upper part, which can improve the chip removal ability, reduce the axial force and torque, and can better remove chips during large feed.

[0031] Any simple deformation or combination of the technical solutions and technical features of the embodiments of the present invention should be considered to fall within the protection scope of the present invention.

Claims

1. A replaceable blade, wherein the bottom of the replaceable blade is provided with a central positioning groove and a positioning surface, and the middle of the replaceable blade is provided with two screw holes symmetrically arranged relative to the center line of the replaceable blade, wherein: Two circumferential cutting edge bands, one large and one small, are arranged on both sides of the upper part of the replaceable blade, wherein the large circumferential cutting edge band is located in front and the small circumferential cutting edge band is located in the rear, two S-shaped center flank surfaces are symmetrically arranged in the middle of the top of the replaceable blade, a transverse edge vertex angle is formed between the two center transverse edges, and the size of the transverse edge vertex angle is between 90° and 160°, the large circumferential cutting edge band, the small circumferential cutting edge band, the S-shaped center flank surface and the main cutting edge are all symmetrically arranged relative to the center line of the replaceable blade, two arc pit cuts are arranged on the front and rear sides of the upper part of the replaceable blade, two chip breaking grooves symmetrically arranged relative to the center line of the replaceable blade are arranged on the front and rear side corners of the replaceable blade, and the head of each chip breaking groove is provided with a negative chamfer of the cutting edge.

2. The replaceable blade according to claim 1, characterized in that: Large arc chisel edge grinding devices symmetrically arranged with respect to the center line of the replaceable blade are arranged on both sides of the upper part of the replaceable blade.

3. The replaceable blade according to claim 1, characterized in that: The width of the negative chamfer of the cutting edge is between 0.05 and 0.5 mm, and the angle of the negative chamfer of the cutting edge is between -10° and -60°.

4. The replaceable blade according to claim 1, characterized in that: Two chip grooves symmetrically arranged relative to the center line of the replaceable blade are arranged in the middle of the upper part of the replaceable blade.

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