Drill bit for deep hole machining

Abstract

The utility model discloses a drill bit for deep hole machining, and relates to the technical field of drilling drill bits. The cutter body comprises a cutter bar fixedly connected with the cutter handle, a cutter core and side blades, the side blades are arranged on the cutter core, chip grooves are formed between the side blades, the distance between the bottom walls of the two corresponding chip grooves is the thickness of the cutter core, and the core thickness of the cutter core accounts for 28% of the diameter of the cutter bar. The core thickness of the end, away from the cutter handle, of the cutter core accounts for 30% of the diameter of the cutter bar, and a cutting drill is arranged at the end, away from the cutter handle, of the cutter core. The core thickness of the cutter core at the cutting end is increased, the strength of the cutter body is improved, the cutter body is firmer and more durable, the service life of the drill bit is prolonged, the cutter core smaller than the cutting end is arranged, materials are saved, the cost is reduced, meanwhile, the angle of a chip groove is increased through the thickness difference of the cutter core, chip removal is smoother, accumulation of cutting chips is reduced, and the cutting efficiency and quality are improved.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of drilling bits, in particular to a drill bit for deep hole machining. BACKGROUND

[0002] The so-called deep hole is a kind of hole machining mode (non-standard) with a machining hole diameter ratio exceeding 7 times the diameter; it is suitable for creating holes with a required depth in different sizes, and the numerically controlled machining materials are from aluminum, steel, titanium alloy, cast iron and other materials, and the application field is relatively wide; later, the technology is continuously improved and expanded to other applications, including manufacturing automobile parts, low holes in injection molding, aerospace parts, different parts in the petroleum and natural gas field, general engineering parts and the like.

[0003] The deep hole drill bit in the prior art is usually a straight cylinder type, the slender cutter body is arranged to cut into a workpiece, and the chip groove arranged on the cutter body is used to discharge the cutting chips.

[0004] Due to the working condition requirement of the deep hole drill bit, the cutter body needs to cut into the workpiece deeply, so that the cutting chips are difficult to discharge, the chip accumulation affects the deep cutting of the drill bit, and the cutting efficiency and quality are reduced. CONTENT OF THE INVENTION

[0005] The application aims to provide a drill bit for deep hole machining, so as to solve the problem that the deep hole drill bit cuts into the workpiece deeply, the cutting chips are difficult to discharge, the chip accumulation affects the deep cutting of the drill bit, and the cutting efficiency and quality are reduced.

[0006] The application provides a drill bit for deep hole machining, which adopts the following technical scheme:

[0007] The drill bit for deep hole machining comprises a shank and a cutter body, the cutter body comprises a cutter rod, a cutter core and side cutting edges, the side cutting edges are arranged on the cutter core, chip grooves are arranged between the side cutting edges, the distance between the bottom walls of the corresponding two chip grooves is the thickness of the cutter core, the proportion of the thickness dimension of the cutter core to the diameter dimension of the cutter rod is 28%, the proportion of the thickness dimension of the cutter core at the end far from the shank to the diameter dimension of the cutter rod is 30%, and a cutting drill is arranged at the end of the cutter core far from the shank.

[0008] By adopting the above technical scheme, the thickness of the cutter core at the cutting end is increased, the strength of the cutter body is improved, the cutter body is more solid and durable, the service life of the drill bit is improved, the cutter core smaller than the cutting end is arranged, the material is saved, the cost is reduced, the angle of the chip groove is increased by using the thickness difference of the cutter core, the chip discharge is more smooth, the cutting chip accumulation is reduced, and the cutting efficiency and quality are improved.

[0009] Optionally, the side cutting edges are arranged in a plurality of rows, the side cutting edges are designed in a spiral manner, and the side cutting edges extend from the cutting drill to the end of the cutter core close to the cutter rod.

[0010] By adopting the technical scheme, the side cutting edge is the main cutting part of the cutter body, so that the cutter body can effectively cut the workpiece during rotation.

[0011] Optionally, the chip flute is designed in a spiral manner, the rotation direction of the chip flute is opposite to the rotation direction of the cutter body when the cutter body cuts chips, and the bottom surface of the chip flute is arc-shaped.

[0012] By adopting the technical scheme, the chip flute is arranged to discharge the chips generated during cutting, so as to avoid the accumulation of the chips affecting the smoothness of cutting and the quality of cutting. The spiral chip flute opposite to the rotation direction of the cutter body is arranged, so that the chips generated during cutting can be more smoothly transported out of the cutting groove by the cutting force during the rotation of the cutter body. The arc-shaped bottom surface of the chip flute reduces the transportation resistance of the chips, so that most of the chips are difficult to adhere and are smoothly discharged.

[0013] Optionally, the cutting drill is conical, a plurality of drill edges are arranged on the cutting drill, a flat top surface is arranged on the top surface of the cutting drill, and the flat top surface is planar.

[0014] By adopting the technical scheme, the conical cutting drill is arranged to increase the pressure, so that the cutter body is more easily pushed to cut the workpiece under the same cutting force. The flat top surface is arranged to protect the cutting drill, so as to avoid the cutting drill being too sharp and being easily worn, thereby prolonging the service life of the cutting drill. Meanwhile, the contact area of the flat top surface is more stable than that of a point contact, so as to improve the stability during cutting positioning.

[0015] Optionally, the side cutting edge is provided with a turning edge close to one end of the cutting drill, the turning edge is a four-surface sharp, and the turning edge is pointed towards the rotation direction of the cutter body when the cutter body cuts chips.

[0016] By adopting the technical scheme, the turning edge is arranged to facilitate the contact cutting of the workpiece and guide the cutting of the side cutting edge, thereby improving the stability of the side cutting edge during cutting.

[0017] Optionally, the side cutting edge is provided with a chip dividing groove close to one end of the cutting drill, one side of the chip dividing groove is connected with the turning edge, and the bottom surface of the chip dividing groove is arc-shaped.

[0018] By adopting the technical scheme, the chip dividing groove is arranged to guide the chips generated by the preliminary contact cutting of the turning edge to different chip flutes for removal, so as to reduce the accumulation of the chips and improve the chip removal efficiency, the cutting efficiency and the cutting quality.

[0019] Optionally, a group of liquid holes are arranged in the cutter core, the liquid holes penetrate through the cutter core, the cutter rod and the handle, and the extension line of the outlet direction of the liquid holes is concentrated at a point.

[0020] By adopting the technical scheme, the cutting fluid can be injected from the drill hole when drilling through the liquid hole, the cutting fluid is used to flush out the debris, the temperature of the tool body is reduced, the tool body is prevented from being damaged due to the high temperature, and the service life of the drill bit is prolonged.

[0021] Optionally, the tool rod is provided with a tool withdrawal groove at the connection with the tool shank.

[0022] By adopting the technical scheme, the tool withdrawal groove is provided, the tool is facilitated to be withdrawn, the chip space is increased, and the discharge of the debris is facilitated.

[0023] Optionally, the tool shank is provided with a fixed end at the end away from the tool body.

[0024] By adopting the technical scheme, the fixed end is provided, the drill bit is facilitated to be fixed and replaced.

[0025] In summary, the present application has at least one beneficial technical effect of the drill bit for deep hole machining:

[0026] 1. The thickness of the cutting end tool core is increased to improve the strength of the tool body, the tool body is more solid and durable, the service life of the drill bit is prolonged, the tool core smaller than the cutting end is provided to save materials and reduce costs, the angle of the chip groove is increased by the thickness difference of the tool core, the chip discharge is more smooth, the accumulation of cutting debris is reduced, and the cutting efficiency and quality are improved;

[0027] 2. The tapered cutting drill is provided to increase the pressure, the tool body is more easily cut and advanced to the workpiece under the same cutting force, the flat top surface is provided to protect the cutting drill, the cutting drill is prevented from being too sharp and easily worn, the service life of the cutting drill is prolonged, and the flat top surface has a larger contact area than the point contact, and the stability during cutting positioning is improved;

[0028] 3. The chip groove is provided to guide the debris preliminarily contacted by the rotating blade to different chip grooves for removal, the accumulation of the debris is reduced, the chip removal efficiency is improved, and the cutting efficiency and quality are improved. BRIEF DESCRIPTION OF DRAWINGS

[0029] Figure 1 is a schematic view of the overall structure of the drill bit for deep hole machining in Example One.

[0030] Figure 2 is a schematic view of the structure for embodying the cutting drill in Example One.

[0031] Figure 3 is a schematic view of the overall structure of the drill bit for deep hole machining in Example Two.

[0032] Figure 4 is Figure 3 is an enlarged schematic view of the structure at A in Example Two.

[0033] In the figure, 1, the shank; 2, the blade; 21, the core; 22, the side cutting edge; 23, the rod; 3, the chip flute; 4, the cutting drill; 5, the drill edge; 6, the flat top; 7, the turning edge; 8, the chip flute; 9, the liquid hole; 10, the retraction groove; 11, the fixed end. DETAILED DESCRIPTION

[0034] The following will be described in detail in combination with the accompanying drawings Figure 1 - the accompanying drawings Figure 2 , this application will be further described in detail.

[0035] Example one:

[0036] A drill bit for deep hole machining, referring to Figure 1 , including shank 1, blade 2; the blade 2 and the shank 1 are fixedly connected by welding, the shank 1 is provided with a fixed end 11 connected with the machine tool at the end away from the blade 2, and the retraction groove 10 is arranged at the connecting position of the rod 23 and the shank 1.

[0037] Referring to Figure 1 , the blade 2 includes the rod 23, the core 21 and the side cutting edge 22 fixedly connected with the shank, the side cutting edge 22 is arranged on the core 21, the chip flutes 3 are arranged between the side cutting edges 22, the distance between the bottom walls of the corresponding two chip flutes 3 is the thickness of the core 21, the proportion of the thickness dimension of the core 21 to the diameter dimension of the rod 23 is 28%, the proportion of the thickness dimension of the core 21 away from the shank 1 to the diameter dimension of the rod 23 is 30%, a group of liquid holes 9 are arranged in the core 21, the liquid holes 9 penetrate through the core 21, the rod 23 and the shank 1, and the liquid holes 9 are arranged to spray cutting fluid during cutting, help to flush out the debris and reduce the temperature of the blade 2, and the extension line of the outlet direction of the liquid hole 9 is concentrated at a point, that is, the cutting fluid sprayed by the liquid hole 9 can be concentrated in front of the drill bit.

[0038] Referring to Figure 1 , Figure 2 , the side cutting edge 22 is arranged on the core 21, the side cutting edge 22 is provided with a plurality of strips, the side cutting edge 22 is designed in a spiral manner, the side cutting edge 22 extends to one end of the core 21 close to the rod 23 from the cutting drill 4, the chip flutes 3 are arranged between the side cutting edges 22, the chip flutes 3 are designed in a spiral manner, the rotation direction of the chip flutes 3 is opposite to the rotation direction of the blade 2 when cutting chips, when cutting chips, the debris enters the chip flutes 3 under the action of cutting force, and the bottom surface of the chip flutes 3 is arc-shaped.

[0039] Referring to Figure 1 , Figure 2 , the core 21 is provided with the cutting drill 4 at the end away from the shank 1, a plurality of drill edges 5 are arranged on the cutting drill 4, the drill edges 5 are the side cutting edges 22 extending to one side of the cutting drill 4, and the drill edges 5 are designed in a taper angle, which is used for cutting the workpiece when the cutting drill 4 contacts.

[0040] Example two, compared with example one, the difference lies in that:

[0041] Referring to Figure 4 , the side cutting edge 22 is provided with a turning edge 7 near one end of the cutting drill 4, the turning edge 7 is a four-surface sharp, the turning edge 7 is pointed towards the rotation direction when the cutting drill 4 cuts the workpiece, when the cutting drill 4 cuts the workpiece, the side cutting edge 22 is provided with a chip breaker groove 8 near one end of the cutting drill 4, one side of the chip breaker groove 8 is connected with the turning edge 7, the bottom surface of the chip breaker groove 8 is arc-shaped, after the turning edge 7 contacts the workpiece, the cutting drill 4 cuts the workpiece, and the chips are shunted through the chip breaker groove 8 and flow into different chip grooves 3.

[0042] Referring to Figure 3 , Figure 4 , the cutting drill 4 is provided with a drill bit 5, the drill bit 5 is a bevel surface on the cutting drill 4, the cutting drill 4 top surface is provided with a flat top surface 6, the flat top surface 6 is a plane.

[0043] The implementation principle of the embodiment of the present application is:

[0044] In actual work, after the drill bit is fixed, the drill bit is pressed down, after the flat top surface 6 contacts the workpiece, the drill bit is rotated, the cutting drill 4 rotates and penetrates into the workpiece, the turning edge 7 contacts the cutting workpiece, the chips are shunted to different chip grooves 3 through the chip breaker groove 8, under the guidance of the turning edge 7, the side cutting edge 22 penetrates and cuts, the cutting fluid is sprayed in the liquid hole 9, the thicker drill bit 21 of the cutting end drill bit 21 is designed, the chip groove 3 is more smooth, the cutting efficiency and quality are improved.

[0045] The embodiments of the specific embodiment are the preferred embodiments of the present application, and are not limited to the protection scope of the present application, wherein the same parts are indicated by the same reference numerals. Therefore, any equivalent changes made according to the structure, shape, principle of the present application should be covered in the protection scope of the present application.

Claims

1. A drill bit for deep hole machining, characterized in that: The tool includes a handle (1) and a blade (2). The blade (2) includes a shank (23) fixedly connected to the handle, a core (21), and side cutting edges (22). The side cutting edges (22) are disposed on the core (21). Chip removal grooves (3) are provided between the side cutting edges (22). The distance between the bottom walls of the corresponding two chip removal grooves (3) is the thickness of the core (21). The core thickness of the core (21) accounts for 28% of the diameter of the shank (23). The core thickness of the end of the core (21) away from the handle (1) accounts for 30% of the diameter of the shank (23). A cutting drill (4) is provided at the end of the core (21) away from the handle (1).

2. The drill bit for deep hole machining according to claim 1, characterized in that: The side cutting edge (22) is provided with several of them. The side cutting edge (22) is designed in a spiral shape. The side cutting edge (22) extends from the cutting drill (4) to the end of the core (21) near the tool shank (23).

3. The drill bit for deep hole machining according to claim 1, characterized in that: The chip removal groove (3) is designed in a spiral shape. The rotation direction of the chip removal groove (3) is opposite to the rotation direction of the blade (2) when cutting chips. The bottom surface of the chip removal groove (3) is arc-shaped.

4. A drill bit for deep hole machining according to claim 1, characterized in that: The cutting drill (4) is conical, and a number of drill bits (5) are provided on the cutting drill (4). The top surface of the cutting drill (4) is provided with a flat top surface (6), and the flat top surface (6) is a plane.

5. A drill bit for deep hole machining according to claim 1, characterized in that: The side blade (22) is provided with a rotating blade (7) near the cutting drill (4). The rotating blade (7) is a four-faceted spike, and the tip of the rotating blade (7) faces the rotation direction of the blade body (2) when cutting chips.

6. A drill bit for deep hole machining according to claim 1, characterized in that: The side cutting edge (22) is provided with a chip-breaking groove (8) at one end near the cutting drill (4). One side of the chip-breaking groove (8) is connected to the rotating cutting edge (7), and the bottom surface of the chip-breaking groove (8) is arc-shaped.

7. A drill bit for deep hole machining according to claim 1, characterized in that: The cutter core (21) is provided with a set of liquid holes (9), which are provided through the cutter core (21), the cutter bar (23) and the cutter handle (1). The extension lines of the liquid holes (9) in the outlet direction are concentrated at one point.

8. A drill bit for deep hole machining according to claim 1, characterized in that: A tool relief groove (10) is provided at the connection between the tool holder (23) and the tool handle (1).

9. A drill bit for deep hole machining according to claim 1, characterized in that: The handle (1) is provided with a fixed end (11) at the end away from the blade (2).

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