CN214443316U - Composite drill bit - Google Patents

Abstract

The utility model relates to the technical field of machining, in particular to a composite drill bit, which comprises a cutter handle, wherein the rear end of the cutter handle is used for being installed on a machine tool, the front end of the cutter handle is provided with a cutter body, the outer wall of the cutter body is provided with at least three spiral cutting edges, each cutting edge comprises at least three cutting edge units, and the cutting edge unit on the same cutting edge comprises at least one conical cutting edge unit; the utility model discloses can once only accomplish the rough machining in at least three conical surface abnormal shape hole, its drilling speed is fast, the drill bit is longe-lived, and the many conical surfaces abnormal shape hole axiality that obtains is high, can match the fine-machined technological requirement well, is showing the manufacturing quality and the efficiency that have improved many conical surfaces abnormal shape hole, has reduced intensity of labour, is favorable to the development of basic manufacturing process.

Description

Composite drill bit

Technical Field

The utility model relates to an accurate machining technical field, in particular to compound drill bit.

Background

As shown in fig. 1, in the machining of parts of precision machinery or ordnance, special-shaped holes with large depth, multiple conical surfaces and high requirements on surface roughness and coaxiality appear, and for the machining of the special-shaped holes with multiple conical surfaces, a drill is generally used for drilling, namely, rough machining is carried out on the holes; and then using a reamer to cut off a thin layer of metal on the inner surface of the hole, thereby completing the fine machining process of reaming or repairing the hole.

For rough machining of special-shaped holes with large depth and multiple conical surfaces, different conventional drill bits are generally adopted for sectional drilling at present, the coaxiality of the multiple conical surfaces machined by the method is poor, the rejection rate is high, and particularly for high-precision special-shaped holes with more than three continuous conical surfaces, the conventional drill bit sectional drilling mode is high in machining difficulty, long in consumed time and low in qualified rate, and cannot well match the process requirements of the subsequent fine machining process.

SUMMERY OF THE UTILITY MODEL

The utility model provides a composite drill bit aiming at the technical defects that the existing drill bit has low processing precision and great difficulty for the multi-conical surface special-shaped hole and can not better match the process requirement of the subsequent finish machining process; composite drill bit can once only accomplish the rough machining in at least three conical surface abnormal shape hole, and its drilling speed is fast, the drill bit is longe-lived, and the many conical surfaces abnormal shape hole axiality that obtains is high, can match finish machining's technological requirement well, is showing manufacturing quality and the efficiency that has improved many conical surfaces abnormal shape hole, has reduced intensity of labour, is favorable to the development of basic manufacturing process.

In order to achieve the above object, the utility model provides a following technical scheme:

the utility model provides a composite drill bit, includes the handle of a knife, the rear end of handle of a knife is used for installing on the lathe, the front end of handle of a knife is equipped with the cutter body, be equipped with at least three helical cutting edge on the cutter body outer wall, every the cutting edge includes mutual continuous forming's at least three cutting edge unit, and is same on the cutting edge including at least one toper cutting edge unit in the cutting edge unit.

Most conventional drill bits have two helical blades provided in the cutter body, and the greater the number of blades, the higher the cutting accuracy and rotational stability, but the lower the strength of the cutter body, with respect to workability. The utility model is provided with at least three spiral blades, which can obviously improve the cutting precision and the rotation stability;

in order to solve the technical defects that the coaxiality and the processing efficiency cannot be ensured in the conventional sectional drilling, the utility model discloses each cutting edge is sectioned to form at least three continuous cutting edge units with different outer diameters, wherein at least one cutting edge unit is a tapered cutting edge unit with taper, and the taper theta of the tapered cutting edge unit is used for matching the taper of the special-shaped hole; therefore, the composite drill bit of the utility model can drill at least three sections of holes with different inner diameters at one time, avoids the technical defect that the coaxiality cannot be guaranteed by subsection drilling, can well match the process requirement of finish machining, obviously improves the manufacturing quality and efficiency of the multi-conical-surface special-shaped hole, and reduces the labor intensity;

preferably, the cutter body is provided with three cutting edges which are uniformly distributed on the outer wall of the cutter body.

The larger the number of blades, the higher the cutting accuracy and rotational stability, but the lower the blade strength. In order to give consideration to both the machining quality and the service life of the drill bit, three cutting edges are recommended, and the drill bit has better comprehensive performance and lower cost.

Preferably, three blade units, namely a first blade unit, a second blade unit and a third blade unit, are arranged on each blade, wherein the second blade unit positioned in the middle is the conical blade unit.

Among the three blade units, the blade unit at the front end has no taper and has a smaller diameter; the rear end blade unit has no taper and larger diameter; the middle blade unit has conicity and is matched with the diameter size of the front and rear blade units; three sections of holes with different inner diameters are obtained, the coaxiality is high, and the process requirements of subsequent finish machining can be well matched.

Preferably, the surfaces of the first blade unit and the second blade unit are cambered surfaces and have included angles with each other, and the third blade unit is of a spiral cambered surface structure.

The structure can improve the cutting efficiency, and has good comprehensive performances such as heat dissipation performance, structural strength and the like, thereby being a preferable scheme proved by practice.

Preferably, the composite drill bit is a tungsten steel alloy structural member.

The tungsten steel alloy is one of hard alloys, has high strength and hardness, small deformation and good cutting processability, and can better adapt to the process characteristics of multi-taper special-shaped holes.

The utility model has the advantages that: the utility model can finish rough machining of at least three conical surface special-shaped holes at one time, and has fast drilling speed and long service life of the drill bit; the obtained multi-conical-surface special-shaped hole has high coaxiality, can well match the process requirement of finish machining, obviously improves the manufacturing quality and efficiency of the multi-conical-surface special-shaped hole, reduces the labor intensity, and is beneficial to the development of a basic manufacturing process.

Drawings

The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.

FIG. 1 is a schematic diagram of a large depth, multi-taper profile hole configuration.

Fig. 2 is a schematic structural diagram of the composite drill of the present invention.

Fig. 3 is a front view of a composite drill bit of the present invention.

Fig. 4 is a side view of a composite drill bit of the present invention.

Fig. 5 is a schematic view of the working principle of the composite drill of the present invention.

The reference signs are: 1-knife handle, 2-knife body, 3-knife edge, 31-knife edge unit, 311-knife edge unit I, 312-knife edge unit II, 313-knife edge unit III, 4-special-shaped hole.

Detailed Description

As shown in fig. 2-4, a composite drill bit includes a tool shank 1, a rear end of the tool shank 1 is used for being mounted on a machine tool, a tool body 2 is arranged at a front end of the tool shank 1, three helical blades 3 are arranged on an outer wall of the tool body 2, each blade 3 includes three blade units 31 which are formed continuously, namely a blade unit i 311, a blade unit ii 312 and a blade unit iii 313, wherein the blade unit ii 312 located in the middle is the conical blade unit; the composite drill bit in the embodiment is a tungsten steel alloy structural member.

The surfaces of the first blade unit 311 and the second blade unit 312 are cambered surfaces, and form an included angle with each other, and the taper theta of the tapered blade unit is 38 degrees; the angle is actually tested, has excellent cutting performance, higher stability and finished product quality and is recommended taper; in actual operation, different tapers can be selected according to different working conditions.

Most conventional drill bits have two helical blades provided in the cutter body, and the greater the number of blades, the higher the cutting accuracy and rotational stability, but the lower the strength of the cutter body, with respect to workability. This embodiment sets up three helical blade 3, compromises processingquality and drill bit life-span, and comprehensive properties is better, the cost is lower.

As shown in fig. 5, in order to solve the technical defect that the existing sectional drilling cannot ensure the coaxiality and the machining efficiency, in the embodiment, the cutting edge 3 forms three continuous cutting edge units 31 with different outer diameters, and the cutting edge unit 31 at the front end has no taper and has a smaller diameter; the rear end blade unit 31 has no taper and larger diameter; the second blade unit 312 is a tapered blade unit with a taper theta, and the taper theta is used for matching the taper of the special-shaped hole 4; therefore, the composite drill bit can drill three sections of holes with different inner diameters at one time, the technical defect that the coaxiality cannot be guaranteed by multiple times of drilling is avoided, the process requirement of finish machining can be well matched, the manufacturing quality and efficiency of the multi-conical-surface special-shaped hole are obviously improved, and the labor intensity is reduced;

the tungsten steel alloy is one of hard alloys, has high strength and hardness, small deformation and good cutting processability, and can better adapt to the process characteristics of multi-taper special-shaped holes.

The utility model can finish rough machining of at least three conical surface special-shaped holes at one time, and has fast drilling speed and long service life of the drill bit; the obtained multi-conical-surface special-shaped hole has high coaxiality, can well match the process requirement of finish machining, obviously improves the manufacturing quality and efficiency of the multi-conical-surface special-shaped hole, reduces the labor intensity, and is beneficial to the development of a basic manufacturing process.

All of the features disclosed above, or all of the steps in any method or process disclosed, may be combined in any combination, except features and/or steps that are mutually exclusive.

The above description is only exemplary of the present invention and should not be taken as limiting the scope of the present invention, as any modifications, equivalents, improvements and the like made within the spirit and principles of the present invention are intended to be included within the scope of the present invention.

Claims (5)

1. The utility model provides a composite drill bit, includes handle of a knife (1), the rear end of handle of a knife (1) is used for installing on the lathe, the front end of handle of a knife (1) is equipped with cutter body (2), its characterized in that, be equipped with at least three helical cutting edge (3) on cutter body (2) outer wall, every cutting edge (3) are including at least three cutting edge unit (31) of mutual continuous forming, and are same on cutting edge (3) including at least one toper cutting edge unit in cutting edge unit (31).

2. A composite drill bit according to claim 1, characterized in that the body (2) is provided with three cutting edges (3) and is evenly distributed over the outer wall of the body (2).

3. A composite drill bit according to claim 1, characterized in that three said blade units (31) are provided on each said blade (3), namely blade unit one (311), blade unit two (312), blade unit three (313), wherein the blade unit two (312) in the middle is said conical blade unit.

4. A composite drill bit according to claim 3, wherein the first blade unit (311) and the second blade unit (312) are cambered surfaces and have an included angle with each other, and the third blade unit (313) is a spiral cambered surface structure.

5. A composite drill bit according to claim 1, wherein the composite drill bit is a tungsten steel alloy structural member.

Images