CN211516186U - Hard alloy drill bit for processing high-temperature alloy - Google Patents

Abstract

The utility model discloses a cemented carbide drill bit for processing high temperature alloys. The end of the drill bit is provided with two cutting seats, and the two cutting seats are symmetrically arranged relative to the axis center of the drill bit; The cutting seat includes an outer edge, a chip flute and a transition edge which are sequentially distributed from the center of the end of the drill bit to the edge, and the two outer edges form a cutting edge at the center of the end of the drill bit. An outer edge flank is provided, and a transition flank is arranged behind the transition edge; the outer edge flank, the chip splitter and the rear edge of the transition flank form an inner edge on the drill surface. The utility model can center the hole on the surface of the workpiece, has the function of drilling guidance, the chip splitting groove can play the role of chip splitting, accelerate the chip removal, reduce the probability of thermal efficiency wear of the drill bit, and reduce the drilling time through the step-by-step cutting of the main cutting edge and the inner edge. Cutting force, improve the cutting ability of the drill.

Description

A cemented carbide drill bit for processing high temperature alloys

technical field

The utility model relates to the field of drilling machining of medium holes, in particular to a hard alloy drill bit for machining high temperature alloys.

Background technique

The cutting performance of superalloy is poor, especially when drilling is more difficult, because it has high plasticity, toughness, high temperature strength, large deformation resistance, serious work hardening, and high drilling temperature. The drill bits in this paper are all continuous cutting, the drill bits do not have the function of chip separation, the drill bits are prone to thermal effect wear, and the durability is low, and the drilling centering is not performed before drilling, which is prone to additional deformation during the cutting process, and the drilling quality is poor and the yield is high. Low.

Utility model content

In order to solve the technical problems that the superalloy drill bit in the prior art does not have the function of separating chips, and the drilling is not centered before drilling, which causes the drill bit to be prone to thermal effect wear, poor drilling quality, and low yield, the utility model provides A cemented carbide drill bit for processing high temperature alloys solves the above problems.

The technical solution adopted by the utility model to solve the technical problem is as follows: a hard alloy drill bit for processing high temperature alloys, the drill bit is made of hard alloy material, and the end of the drill bit is provided with two cutting seats, two Each of the cutting seats is symmetrically arranged relative to the axial center of the drill bit; each of the cutting seats includes an outer edge, a chip groove and a transition edge that are sequentially distributed from the center of the end of the drill bit to the edge. The outer edge forms a blade tip at the center of the end of the drill bit, the rear of the outer blade is provided with an outer blade flank, and the rear of the transition blade is provided with a transition flank; The rear edge of the chip flute and the transition flank forms an inner edge on the surface of the drill bit, and an inner edge flank is arranged behind the inner edge; The chip flute and the transition edge meet at the same time, and the included angle a between the two outer edges is greater than the included angle b between the two transition edges.

Further, the outer edge is formed by connecting an arc-shaped blade section and a straight blade section, the arc-shaped blade section is arranged close to the center of the end of the drill bit, and one end of the outer edge close to the center of the end of the drill bit is connected to the opposite side. The ends of the inner edges on the adjacent cutting seat meet.

Preferably, the transition edge is a straight edge.

Preferably, the inner edge is a circular arc edge, and the concave side of the circular arc edge faces a direction opposite to the rotation direction of the drill bit.

Preferably, the size of the included angle a is 100°˜110°, and the size of the included angle b is 125°˜130°.

Preferably, the included angle c between the tangent of the arc-shaped blade and the straight blade segment is 70°˜75°.

The beneficial effects of the present utility model are:

The utility model comprises an outer edge, an inner edge, a transition edge and a chip groove. The outer edge and the transition edge are used as main cutting edges to first grind a larger arc edge, the inner edge is used for fine cutting, and the outer edge is the first Cutting, centering the hole on the surface of the alloy, has the function of drilling guide, the chip splitter can play the role of chip splitting, speed up the chip removal, reduce the probability of thermal efficiency wear of the drill, and reduce the drilling force through the step-by-step cutting of the main cutting edge and the inner edge , to improve the cutting ability of the drill.

Description of drawings

The present utility model will be further described below in conjunction with the accompanying drawings and embodiments.

Fig. 1 is the main body diagram of the specific embodiment of the cemented carbide drill bit for processing superalloy according to the present utility model;

2 is a top view of a specific embodiment of a cemented carbide drill for processing superalloys according to the present invention;

3 is a schematic diagram of the relief angle of the outer blade relief surface of the present utility model;

4 is a schematic diagram of the relief angle of the transition edge relief face 1 in the present utility model;

5 is a schematic diagram of the relief angle of the transition edge relief surface II of the present utility model;

Fig. 6 is the schematic diagram of the inner edge rake angle described in the present utility model;

FIG. 7 is a schematic diagram of the rake angle of the transition edge in the present invention.

In the figure, 1. Drill bit, 2. Cutting seat, 3. Outer edge, 301, Curved edge segment, 302, Straight edge segment, 4. Chip splitter, 5. Transition edge, 6. Inner edge, 7. Outer edge Flank, 8. Transition flank 1, 9. Transition flank 2, 10. Inner flank flank, 11. Blade tip.

Detailed ways

The following describes in detail the embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals refer to the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, but should not be construed as a limitation of the present invention.

In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present invention and simplifying It is described, rather than indicated or implied, that the device or element referred to must have a particular orientation, be constructed and operate in a particular orientation, and therefore should not be construed as limiting the invention.

Furthermore, the terms "first," "second," etc. are used for descriptive purposes only and should not be construed to indicate or imply relative importance.

A specific embodiment of the present utility model, as shown in Figures 1 and 2, is a cemented carbide drill bit 1 for processing superalloys. The drill bit 1 is made of cemented carbide material. This embodiment is made of YG6YG6X type cemented carbide. , the end of the drill bit 1 is provided with two cutting seats 2, and the two cutting seats 2 are symmetrically arranged relative to the axial center of the drill bit 1; , a chip splitter 4 and a transition edge 5, the two outer edges 3 form a cutting edge 11 at the center of the end of the drill bit 1, the rear of the outer edge 3 is provided with an outer edge flank 7, and the rear of the transition edge 5 is provided with a transition rear The blade face; the outer edge flank 7, the chip groove 4 and the rear edge of the transition flank form an inner blade 6 on the surface of the drill bit 1, and an inner blade flank 10 is arranged behind the inner blade 6; the inner blade flank The face 10 is in contact with the outer edge 3 , the chip splitter 4 and the transition edge 5 on the adjacent cutting seat 2 at the same time, and the included angle a between the two outer edges 3 is greater than the included angle b between the two transition edges 5 . The size of the included angle a is preferably 125°˜130°, and the size of the included angle b is preferably 100°˜110°. In this embodiment, the included angle a is 125°, and the included angle b is 100°.

The outer edge 3 and the transition edge 5 are used as the main cutting edges, and the two outer edges 3 form a cutting edge 11 at the center of the end of the drill bit 1. When cutting, the outer edge 3 first processes a drill core on the surface of the workpiece, so that the guidance is stable and the cutting is light and fast. It is beneficial to the centering of the drill bit 1, the transition edge 5 is used to grind a larger arc edge, the transition edge 5 is a rough machining edge, and the inner edge 6 is a finishing edge, which is used for grinding the outer edge 3 and the transition edge 5 for cutting For the incompletely formed convex parts, the grinding amount of the inner edge 6 is small, and the outer edge 3 is used as the starting point of cutting, so the cutting amount is larger. chips to avoid overheating of the tool. The utility model has the advantages of stable drilling, high smoothness of the workpiece processing surface after drilling, and can be used for drilling with larger apertures, and the thermal load overload of the tool will not be caused due to the large drilling area.

In a specific embodiment of the present invention, the outer blade 3 is formed by connecting an arc-shaped blade section 301 and a straight blade section 302 . The arc-shaped blade section 301 is arranged near the center of the end of the drill bit 1 One end of the edge 3 is in contact with the end of the inner edge 6 on the adjacent cutting seat 2 . Usually, the main cutting edge is deviated from the central axis of the tool. If the outer edge 3 is only set as a straight edge, a chisel edge will be formed between the tips of the two outer edges 3. The larger the width b of the chisel edge, the axial resistance during drilling. Also larger, the setting of the arc edge segment 301 can make the apex angle of the outer edge 3 approach the center of the shank, reduce the size of the width b of the chisel edge, reduce the axial resistance, improve the strength of the drill core, and avoid chipping. The inner edge 6 extends from the tip of the outer edge 3 to the end of the transition edge 5, so that the inner edge 6 performs finishing on each surface cut by the outer edge 3 and the transition edge 5, and the tip refers to the end close to the center of the drill bit 1, The end refers to the end close to the edge of the drill bit 1 . The size of the included angle c between the tangent of the arc-shaped edge and the straight edge segment 302 is preferably 70°˜75°.

In a specific embodiment of the present invention, the transition edge 5 is a straight edge, and the transition edge 5 and the straight edge segment 302 are located on the same straight line. Preferably, the inner edge 6 is an arc edge, and the concave side of the arc edge faces the direction opposite to the rotation direction of the drill bit 1 .

As shown in Fig. 1-Fig. 7, taking the drill bit 1 of □ 25mm as an example, the vertex angle of the outer edge 3 is a=125°, the vertex angle of the transition edge 5 is b=100°, and the flank angle d= 14°, the flank angle e ₁ = 16° of the transition edge relief surface one 8, the flank angle e ₂ = 30° of the transition edge flank two 9, the rake angle n=-10° of the inner edge 6, the transition edge 5. The rake angle g=-12°, c=70°, the width of the chip groove 4 is L1=L, the depth of the chip groove 4 is h=2.5mm, and the length of the transition edge 5 is L2=L1.

The choice of cutting amount has a great influence on the durability of the drill bit 1 and the drilling quality. Practice has proved that when processing GH2132 iron-based superalloy, when the hole diameter is 12mm and the hole depth is 50mm, the selected cutting amount is: feed f = 0.08mm/r, cutting speed ν = 9.4m/min; processing GH3030 nickel-based high temperature When the alloy is used, when the hole diameter is 20mm and the hole depth is 50mm, the cutting amount is selected as the feed amount f=0.12mm/r, and the cutting speed ν=10.1m/min.

When drilling superalloys, the feed resistance is very large. For example, the drilling hole diameter is 16mm, the feed rate is f=0.12mm/r, and the feed resistance is 6.27kN. When drilling ordinary carbon steel under the same conditions, the feed resistance is Only 2.4kN. Due to the adoption of a new blade profile, drilling superalloys significantly improves cutting conditions, making the drilling process light and stable, reducing feed resistance and improving machining efficiency.

The following points also need to be explained for the present utility model:

(1) In addition to cemented carbide, super-hard cobalt high-speed steel can also be used for the cutting part of drill bit 1 to reduce the phenomenon of work hardening.

(2) When the utility model is used, cutting fluid can be used to cool rapidly, ensure good drilling conditions, improve drilling quality, and avoid severe friction. The filling of cutting fluid must be carried out continuously, otherwise the cutting temperature will change sharply, resulting in cracks and chipping of the alloy insert.

(3) Continuous feeding is required during manual operation, and no idling is allowed to avoid work hardening and accelerate the wear of the drill bit 1.

(4) When sharpening the drill bit 1, attention should be paid to the symmetry of the cutting edges such as the arc edge and the transition edge 5, so as to reduce the deflection of the drill bit 1 due to the depth of cut resistance.

In this specification, schematic representations of such terms do not necessarily refer to the same embodiment. Furthermore, the particular features, structures, materials or characteristics described may be combined in any suitable manner in one or more embodiments.

Taking the above ideal embodiment according to the present invention as inspiration, through the above description, relevant staff can make various changes and modifications without departing from the technical idea of the present invention. The technical scope of the present utility model is not limited to the content in the description, and its technical scope must be determined according to the scope of the claims.

Claims (6)

1. A cemented carbide drill for processing superalloys, characterized in that: the drill is made of cemented carbide, and the end of the drill is provided with two cutting seats, and the two cutting seats are opposite to the The axial center of the drill bit is symmetrically arranged; Each of the cutting seats includes an outer edge, a chip flute and a transition edge that are sequentially distributed from the center of the end of the drill bit to the edge, and the two outer edges form a tip at the center of the end of the drill bit. The rear of the outer blade is provided with an outer blade flank, and the rear of the transition blade is provided with a transition flank; The rear edge of the outer edge flank, the chip splitter and the transition flank forms an inner edge on the drill surface, and an inner edge flank is arranged behind the inner edge; The outer edge, the chip flute and the transition edge on the adjacent cutting seat meet at the same time, and the included angle a between the two outer edges is greater than the included angle b between the two transition edges. 2 . The cemented carbide drill bit for processing superalloys according to claim 1 , wherein the outer edge is formed by connecting an arc-shaped blade section and a straight blade section, and the arc-shaped blade section is close to the edge of the drill bit. 3 . The center of the end is arranged, and one end of the outer edge close to the center of the end of the drill bit is connected with the end of the inner edge on the adjacent cutting seat. 3 . The cemented carbide drill bit for machining superalloys according to claim 1 , wherein the transition edge is a straight edge. 4 . 4 . The cemented carbide drill bit for machining superalloys according to claim 1 , wherein the inner edge is an arc edge, and the concave side of the arc edge faces the direction opposite to the rotation direction of the drill. 5 . 5 . The cemented carbide drill bit for processing superalloys according to claim 1 , wherein the included angle a is 125° to 130°, and the included angle b is 100° to 110°. 6 . 6 . The cemented carbide drill bit for processing superalloys according to claim 2 , wherein the included angle c between the tangent of the arc-shaped edge and the straight edge segment is 70°˜75°. 7 .

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