A super-hard material drill bit that facilitates short chipping

Abstract

The utility model discloses a superhard material drill bit that is convenient for short chip cutting, including a tool handle and a tool head connected to the tool handle, the tool head is provided with a chip groove and a cutting edge, the tool head is provided with a cooling hole for discharging a cooling medium to the tool head, the cutting edge includes two cutting edges with different diameters, the intersection of the two cutting edges with different diameters forms a cutting chamfer, and the cutting edges on both sides of the cutting chamfer are provided with a correction angle not greater than zero degrees, the correction angle is used to make the chips generated during processing naturally curl and break, or change the flow direction of the chips so that they impact with the chip groove, causing them to break, and the chips are discharged under the action of the cooling medium in the cooling hole. The utility model solves the problem of being unable to break chips when processing softer materials.

Description

Technical Field

[0001] The utility model relates to the field of milling cutters, in particular to a drill bit made of superhard material which is convenient for short chip cutting. Background Art

[0002] In today's era, the fields of automobiles, aerospace, rail transportation, etc. are developing rapidly with each passing day, and under the premise of this, there are constantly new and higher demands for lightweight product materials.

[0003] For example, aluminum alloy and titanium alloy have the characteristics of light weight, high strength, and recyclability. Their high strength, good corrosion resistance and high temperature mechanical properties make them widely used in high-tech fields such as aerospace.

[0004] When it comes to lightweight materials, it is not only metals, but also polymer materials, such as polypropylene (PP), polyimide (PI), polycarbonate (PC), etc. These materials have excellent properties such as high strength, good rigidity, high temperature resistance, chemical corrosion resistance, etc., and are also the best choice in aerospace and other fields.

[0005] Drills are also widely used in the production and processing of these materials, but these lightweight materials have a common processing problem. Because the material is relatively soft, long chips will be generated during processing, which will wrap around the tool, greatly affecting the processing process and processing quality. The problem is mainly reflected in the following four points:

[0006] (1) Increased drill bit wear: Aluminum chips wrapped around the drill bit will increase the friction between the drill bit and the workpiece, accelerate the wear of the drill bit, and shorten the service life of the drill bit.

[0007] (2) Heat accumulation: Chip entanglement will prevent the coolant from reaching the contact area between the drill bit and the workpiece, resulting in heat accumulation, which may cause the workpiece to overheat and deform, or even burn the drill bit.

[0008] (3) Tool blockage: Chips may block the chip groove 3 of the drill bit, making it impossible for the drill bit to remove chips, which may cause the drill bit to get stuck or break directly.

[0009] (4) Damage to the workpiece surface quality: Chip entanglement will also cause the surface roughness of the processed hole to deteriorate, affecting the appearance and accuracy of the workpiece.

[0010] For this reason, we have proposed a short-chip ultra-hard material drill to solve the problem of soft materials that cannot break chips during processing. Utility Model Content

[0011] In view of the above-mentioned deficiencies of the current milling cutters, the utility model provides a superhard material drill bit that is convenient for short chip cutting, which can achieve the technical effects of rapid cooling, accelerated chip removal efficiency, and increased product life.

[0012] In order to achieve the above object, the embodiment of the utility model adopts the following technical solution:

[0013] A superhard material drill bit that is convenient for short chip cutting comprises a tool handle and a tool head connected to the tool handle, the tool head is provided with a chip groove and a cutting edge, the tool head is provided with a cooling hole for discharging a cooling medium to the tool head, the cutting edge comprises two cutting edges of different diameters, the intersection of the two cutting edges of different diameters forms a chamfer, the cutting edges on both sides of the chamfer are provided with a correction angle not greater than zero degrees, the correction angle is used to make the chips generated during processing curl and break naturally, or change the flow direction of the chips so that they impact with the chip groove to cause them to break, and the chips are discharged under the action of the cooling medium in the cooling hole.

[0014] According to one aspect of the utility model, the cutter head is made of cemented carbide.

[0015] According to one aspect of the present invention, the helix angle of the cutting edge is not less than 30 degrees.

[0016] According to one aspect of the present invention, the tail of the chip flute extends to the tool handle.

[0017] According to one aspect of the utility model, the chip removal groove is an arc groove.

[0018] According to one aspect of the utility model, one side of the chip removal groove is a straight side, and the other side is an arc side.

[0019] The advantages of the implementation of the utility model are as follows: the chips generated during processing are naturally curled and broken by the correction angle, or the chip flow direction is changed after correction, so that they impact with the chip discharge groove, causing them to break, and are discharged with the assistance of coolant flowing out of the cooling water hole, thereby solving the chip entanglement problem. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0021] Figure 1 It is a schematic diagram of the structure of the utility model;

[0022] Figure 2 It is a right side view of the utility model;

[0023] Figure 3 It is a structural schematic diagram of the correction angle described in the utility model.

[0024] 1. Tool handle; 2. Tool head; 3. Chip groove; 4. Cutting chamfer; 5. Correction angle; 6. Cooling hole; 7. Cutting edge. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0026] Embodiment 1:

[0027] like Figures 1 to 3 As shown, a superhard material drill bit that is convenient for short chip cutting includes a shank 1 and a cutter head 2 connected to the shank 1, the cutter head 2 is provided with a chip groove 3 and a cutting edge 7, the cutter head 2 is provided with a cooling hole 6 for discharging a cooling medium to the cutter head 2, the cutting edge 7 includes two cutting edges 7 with different diameters, the intersection of the two cutting edges 7 with different diameters forms a cutting chamfer 4, and the cutting edges on both sides of the cutting chamfer 4 are provided with a correction angle 5 not greater than zero degrees, and the correction angle 5 is used to make the chips generated during processing curl and break naturally, or change the flow direction of the chips so that they impact the chip groove 3, causing them to break, and discharge the chips under the action of the cooling medium in the cooling hole 6. The chip entanglement problem is solved by making the chips generated during processing curl and break naturally through the correction angle 5, or changing the flow direction of the chips after correction so that they impact the chip groove 3, causing them to break, and discharge them with the help of the coolant flowing out of the cooling water hole.

[0028] The width of the correction angle 5 is determined by the tool diameter.

[0029] The angle between the correction angle 5 and the normal axis is different when processing different materials.

[0030] In this embodiment, the cooling medium is a cooling liquid or a cooling gas, such as nitrogen, saponified oil, cutting fluid, water-based cooling liquid, etc.

[0031] In practical applications, the material of the cutter head 2 is hard alloy, such as tungsten-cobalt hard alloy, tungsten-cobalt-titanium hard alloy, etc. By selecting a suitable hard alloy, the service life of the cutter can be increased.

[0032] In practical applications, the helix angle of the cutting edge 7 of the cutter head 2 is not less than 30 degrees. By selecting a suitable helix angle, the cutter can be more adaptable to high-intensity processing.

[0033] In practical applications, the tail of the chip groove 3 extends to the tool handle 1 to prevent chips from remaining on the tool handle 1 and causing the tool handle 1 to overheat.

[0034] In practical applications, the chip removal groove 3 is an arc groove, which reduces the friction resistance between the tool and the workpiece, reduces the heat generated during the use of the tool, and facilitates the discharge of waste chips.

[0035] In practical applications, one side of the chip groove 3 is a straight edge, and the other side is a circular arc edge. This structure facilitates chip breaking.

[0036] The above are only specific implementations of the utility model, but the protection scope of the utility model is not limited thereto. Any changes or substitutions that can be easily thought of by any technician familiar with the technical field within the technical scope disclosed in the utility model should be included in the protection scope of the utility model. Therefore, the protection scope of the utility model shall be based on the protection scope of the claims.

Claims

1. A superhard material drill bit for short chip cutting, comprising a shank (1) and a cutter head (2) connected to the shank (1), wherein the cutter head (2) is provided with a chip removal groove (3) and a cutting edge (7), characterized in that: The cutter head (2) is provided with a cooling hole (6) for discharging a cooling medium to the cutter head (2); the cutting edge (7) comprises two cutting edges (7) of different diameters; the intersection of the two cutting edges (7) of different diameters forms a cutting chamfer (4); the cutting edges on both sides of the cutting chamfer (4) are provided with a correction angle (5) not greater than zero degrees; the correction angle (5) is used to make the chips generated during processing curl and break naturally, or to change the flow direction of the chips so that they impact with the chip discharge groove (3) to cause them to break, and the chips are discharged under the action of the cooling medium in the cooling hole (6).

2. A superhard material drill bit for short chipping according to claim 1, characterized in that: The cutter head (2) is made of hard alloy.

3. A superhard material drill bit for short chipping according to claim 1, characterized in that: The helix angle of the cutting edge (7) is not less than 30 degrees.

4. A superhard material drill bit for short chipping according to any one of claims 1 to 3, characterized in that: The tail of the chip removal groove (3) extends to the tool handle (1).

5. A superhard material drill bit for short chipping according to claim 4, characterized in that: The chip removal groove (3) is an arc-shaped groove.

6. A superhard material drill bit for short chipping according to claim 4, characterized in that: The chip removal groove (3) has a straight edge on one side and a circular arc edge on the other side.

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