CN220761096U

CN220761096U - Multi-step composite drill bit

Info

Publication number: CN220761096U
Application number: CN202322378595.1U
Authority: CN
Inventors: 李雪; 赵文昌; 王佳敏; 林清燕
Original assignee: Xian Fast Auto Drive Co Ltd
Current assignee: Xian Fast Auto Drive Co Ltd
Priority date: 2023-09-01
Filing date: 2023-09-01
Publication date: 2024-04-12
Anticipated expiration: 2033-09-01

Abstract

The utility model discloses a multi-step composite drill bit, and belongs to the technical field of precision machining. Comprises a stepped drill bit and a cutter handle which are fixedly connected; the step drill bit is a four-margin drill bit; the cutter groove of the stepped drill bit is a straight groove, the drill point is X-shaped, and the drill point angle is 135-142 degrees. The drill bit is arranged as the stepped drill bit, and the traditional process of sequentially processing a plurality of drill bits can be completed only by one-time feeding and one-time forming processing, so that the influence of positioning deviation of the upper working procedure and the lower working procedure and the risk of different axes and drilling deviation of stepped deep holes are avoided; the stepped drill bit is designed into a straight flute four-edge drill bit, so that the high rigidity and high strength of the drill bit are ensured, the radial stability in the drilling process is enhanced, the quality and the precision of the hole wall are improved, and the roundness and the straightness of the hole can be better ensured. The shape of the drill point is set to be X-shaped, the angle of the drill point is between 135 and 142 degrees, and good self-centering capability is provided for the drill bit.

Description

Multi-step composite drill bit

Technical Field

The utility model belongs to the technical field of precision machining, and relates to a multi-step composite drill bit.

Background

With the rapid development of the mechanical industry, the quality and cost management of various series of gearbox products by enterprises is also becoming more and more strict. At present, parts of a gearbox product generally have the characteristics of complex structure, high machining precision and the like, so that a composite cutter for machining is required, and the composite cutter not only meets the requirement of production takt, but also has reliability and long service life. Therefore, to adapt to the development requirement, the conventional old-fashioned composite tool needs to be reformed and innovated, and new technology and new materials need to be applied to improve the service performance of the composite machining tool. The composite cutter is a special cutter which combines two or more similar or different hole processing cutters into a whole, can finish the combination of multiple processes such as drilling, reaming, countersinking, boring and the like in one-time processing, and has the forming and processing characteristics of high efficiency, high precision and high reliability.

A multi-step hole is formed in a gearbox shell, the structure is complex, the required drill bit suspension depth is long, a multi-step deep hole is processed in a traditional multi-procedure drilling mode and a single-procedure compound drilling mode, and multi-procedure drilling is influenced by positioning deviation of an upper procedure and a lower procedure, so that the multi-step deep hole is not coaxial and has drilling deviation risks. And the single-procedure compound drill often has the problems of poor positioning, deviation of the drill, cutter breakage and the like due to insufficient suspension extension and rigidity of the cutter. The existing hole machining tool does not have a tool capable of machining and forming the multi-step holes on the gearbox shell at one time, so that the machining is finished with high quality and high efficiency, and a multi-step composite drill bit is required to be specially designed.

Disclosure of Invention

The utility model aims to solve the technical problems that in the prior art, when a multi-step hole is processed, multi-procedure drilling is influenced by positioning deviation of an upper procedure and a lower procedure, step deep holes are not coaxial and have deviation risk, and single-procedure composite drilling is poor in positioning and has deviation and breakage due to insufficient rigidity of a cutter due to suspension extension of the cutter, and the multi-procedure composite drill bit is provided.

In order to achieve the above purpose, the utility model is realized by adopting the following technical scheme:

in a first aspect, the utility model provides a multi-step composite drill bit, comprising a step drill bit and a cutter handle which are fixedly connected; the step drill bit is a four-margin drill bit; the cutter groove of the stepped drill bit is a straight groove; the drill point of the step drill bit is X-shaped; the point angle of the step drill is an obtuse angle; the stepped drill bit is a stepped drill bit with an increasing diameter from the drill tip.

The utility model is further improved in that:

and a booster-type internal cooling hole is also arranged.

The supercharged internal cooling holes comprise a shank internal cooling hole and a drill internal cooling hole; the cross-sectional area of the inner cooling hole of the cutter handle is 3-4 times of that of the inner cooling hole of the drill bit.

The drill bit inner cooling holes comprise drill bit first inner cooling holes and drill bit second inner cooling holes which are symmetrically arranged.

The drill bit and the cutter handle are fixedly connected through a V-shaped welding structure, and the angle of a welding surface is 110-120 degrees.

The step tail of the step drill bit is provided with an anti-burr inclined plane.

The angle between the burr-proof inclined plane and the radial direction of the stepped drill bit is 5-7 degrees.

The step drill bit is made of hard alloy.

The tool handle is made of tool steel.

The point angle of the step drill bit is between 135 and 142 degrees.

Compared with the prior art, the utility model has the following beneficial effects:

the utility model discloses a multi-step composite drill bit, which is characterized in that a drill bit is a step drill bit, and the traditional process of sequentially processing a plurality of drill bits can be completed by feeding and forming at one time, so that the influence of positioning deviation of an upper working procedure and a lower working procedure and the risk of different axes and drilling deviation of step deep holes are avoided; the stepped drill bit is designed into the four-edge drill bit with the straight slot, so that the high rigidity and the high strength of the drill bit are ensured, the radial stability in the drilling process is enhanced, the quality and the precision of the hole wall are improved, the roundness and the straightness of the hole can be better ensured, and the problems of poor positioning, inclined drilling, cutter breakage and the like caused by insufficient rigidity and suspension elongation of the cutter are avoided. The drill point shape is set to be X-shaped, the drill point angle is set to be obtuse, and good self-centering capability is provided for the drill bit.

Furthermore, by adopting the supercharged internal cooling hole structural design, the cross-sectional area of the internal cooling hole at the position of the cutter handle is 3-4 times of that of the drill bit. The purpose is to ensure that the flow rate and dynamic pressure of the cooling liquid are increased in the process of reaching the tool tip from the tool bar. Compared with the traditional single-hole internal cooling structure, the supercharged internal cooling structure has better internal cooling effect, not only cools the cutter and reduces the cutting temperature, but also increases the durability of the drill bit and the stability of the machining size.

Furthermore, the step drill is made of hard alloy, the tool shank is made of tool steel, and the joint drill and the tool shank are fixed together by adopting a 110-120V-shaped welding structure design, so that the manufacturing cost of the tool is greatly reduced.

Further, the step tail of the step drill bit is provided with an anti-burr inclined plane with an angle of 5-7 degrees, and the protection conical surface of the threaded orifice is finished at the same time, so that the generation of flanging burrs at the protection conical surface is effectively prevented. When the conical surface is machined, the inclined surface can directly cut irregular metal parts such as burrs at the inlet of the conical surface, and the smoothness of the orifice plane is ensured.

Drawings

For a clearer description of the technical solutions of the embodiments of the present utility model, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present utility model and should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a front view of a multi-step composite drill bit of the present utility model;

FIG. 2 is a left side view of the multi-step composite drill bit of the present utility model;

FIG. 3 is an enlarged view of FIG. 1 at A;

FIG. 4 is a schematic view of a stepped hole formed by a multi-stepped composite drill bit according to the present utility model.

Wherein: 1-step drill bit; 2, a knife handle; 3-welding surface; 4, cooling holes in the cutter handle; 5-a first inner cooling hole of the drill bit; 6-a second inner cooling hole of the drill bit; 101-a first stepped hole; 102-a second stepped bore; 103-a third stepped hole; 104-a conical protection surface; 105-threaded hole.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the embodiments of the present utility model more apparent, the technical solutions of the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model, and it is apparent that the described embodiments are some embodiments of the present utility model, but not all embodiments of the present utility model. The components of the embodiments of the present utility model generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the utility model, as presented in the figures, is not intended to limit the scope of the utility model, as claimed, but is merely representative of selected embodiments of the utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures.

In the description of the embodiments of the present utility model, it should be noted that, if the terms "upper," "lower," "horizontal," "inner," and the like indicate an azimuth or a positional relationship based on the azimuth or the positional relationship shown in the drawings, or the azimuth or the positional relationship in which the inventive product is conventionally put in use, it is merely for convenience of describing the present utility model and simplifying the description, and does not indicate or imply that the apparatus or element to be referred to must have a specific azimuth, be configured and operated in a specific azimuth, and thus should not be construed as limiting the present utility model. Furthermore, the terms "first," "second," and the like, are used merely to distinguish between descriptions and should not be construed as indicating or implying relative importance.

Furthermore, the term "horizontal" if present does not mean that the component is required to be absolutely horizontal, but may be slightly inclined. As "horizontal" merely means that its direction is more horizontal than "vertical", and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.

In the description of the embodiments of the present utility model, it should also be noted that, unless explicitly specified and limited otherwise, the terms "disposed," "mounted," "connected," and "connected" should be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.

The utility model is described in further detail below with reference to the attached drawing figures:

referring to fig. 1 and 4, the embodiment of the utility model discloses a multi-step composite drill bit, which comprises a step drill bit 1 and a cutter handle 2 which are fixedly connected; the stepped drill bit 1 is a three-step drill bit with the diameter increasing from the drill tip; the ladder drill bit 1 is a four-edge drill bit, the cutter groove is a straight groove, the drill point is X-shaped, and the drill point angle is 140 degrees. The ladder drill 1 is hard alloy, the tool shank 2 is tool steel, and the manufacturing cost of the tool is greatly reduced. The drill bit 1 and the cutter handle 2 are fixedly connected through a V-shaped welding structure, and the angle of a welding surface is 120 degrees. The drill bit is arranged as the stepped drill bit, and the traditional process of sequentially processing a plurality of drill bits can be completed only by one-time feeding and one-time forming processing, so that the influence of positioning deviation of the upper working procedure and the lower working procedure and the risk of different axes and drilling deviation of stepped deep holes are avoided; the stepped drill bit is designed into the four-edge drill bit with the straight slot, so that the high rigidity and the high strength of the drill bit are ensured, the radial stability in the drilling process is enhanced, the quality and the precision of the hole wall are improved, the roundness and the straightness of the hole can be better ensured, and the problems of poor positioning, inclined drilling, cutter breakage and the like caused by insufficient rigidity and suspension elongation of the cutter are avoided. The drill point shape is set to be X-shaped, the drill point angle is between 140 degrees, and good self-centering capability is provided for the drill bit. The multi-step composite drill is further provided with a supercharged internal cooling hole, and the supercharged internal cooling hole comprises a cutter handle internal cooling hole 4 and a drill bit internal cooling hole, wherein the cross-sectional area of the cutter handle internal cooling hole 4 is 3-4 times that of the drill bit internal cooling hole, and as shown in fig. 2, the drill bit internal cooling hole is a drill bit first internal cooling hole 5 and a drill bit second internal cooling hole 6 which are symmetrically arranged. The supercharged internal cooling hole structure design is adopted, and the cross-sectional area of the internal cooling hole at the position of the cutter handle is 3-4 times of that of the drill bit. The purpose is to ensure that the flow rate and dynamic pressure of the cooling liquid are increased in the process of reaching the tool tip from the tool bar. Compared with the traditional single-hole internal cooling structure, the supercharged internal cooling structure has better internal cooling effect, not only cools the cutter and reduces the cutting temperature, but also increases the durability of the drill bit and the stability of the machining size.

Referring to fig. 3, the step tail of the step bit 1 is provided with a burr prevention inclined surface, and the angle between the burr prevention inclined surface and the radial direction of the step bit 1 is 7 °. The screw thread orifice conical protection surface is completed, so that the machining efficiency is improved, the coaxiality requirement and the precision requirement of the product are ensured, and the machining cost is reduced.

Referring to fig. 4, the workpiece machining feature of the multi-step composite drill of the present utility model is shown as a deep blind hole structure, and the first step hole 101, the second step hole 102 and the third step hole 103 need to be machined, and each step hole has a hole chamfer, and the hole of the threaded hole 105 has a conical protection surface 104, so that the coaxiality and precision requirements are high, and all the features need to be completed in one process. After analyzing the special structure, the utility model designs the multi-step composite drill bit, and the multi-step composite drill bit is optimized and innovated in aspects of drill body structure, inner cooling hole and the like.

The working process of the utility model is as follows:

step one, checking the integrity and the cleanliness of a multi-step composite drill bit cutting edge and whether a supercharged internal cooling hole is smooth or not;

firstly, setting a tool on a tool setting gauge, recording the tool length of the multi-step composite drill bit, and checking the size of the multi-step composite drill bit according to a drawing;

step three, cleaning a cutter handle, mounting the multi-step composite drill bit in a cutter magazine, and then typing actual cutter length information into a cutter length register in a machine tool to confirm a machining program and machining parameters;

and step four, operating the machine tool and starting machining.

The above is only a preferred embodiment of the present utility model, and is not intended to limit the present utility model, but various modifications and variations can be made to the present utility model by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model should be included in the protection scope of the present utility model.

Claims

1. The multi-step composite drill bit is characterized by comprising a step drill bit (1) and a cutter handle (2) which are fixedly connected; the step drill (1) is a four-edge drill; the cutter groove of the stepped drill bit (1) is a straight groove; the drill point of the step drill (1) is X-shaped; the point angle of the stepped drill bit (1) is an obtuse angle; the stepped drill bit (1) is a stepped drill bit with increasing diameter from the drill tip.

2. The multi-step composite drill bit of claim 1, further comprising a booster-type inner cooling hole.

3. The multi-step composite drill bit of claim 2, wherein the pressurized inner cooling holes comprise shank inner cooling holes (4) and drill bit inner cooling holes; the cross-sectional area of the inner cooling hole (4) of the cutter handle is 3-4 times of the cross-sectional area of the inner cooling hole of the drill bit.

4. A multi-step composite drill bit according to claim 3, characterized in that the drill bit inner cooling holes comprise a drill bit first inner cooling hole (5) and a drill bit second inner cooling hole (6) which are symmetrically arranged.

5. The multi-step composite drill bit according to claim 1, wherein the drill bit (1) and the shank (2) are fixedly connected through a V-shaped welding structure, and the angle of the welding surface is 110-120 °.

6. Multi-step composite drill bit according to claim 1, characterized in that the step tail of the step drill bit (1) is provided with an anti-burr bevel.

7. Multi-step composite drill bit according to claim 6, characterized in that the angle between the anti-burring bevel and the radial direction of the step drill bit (1) is 5-7 °.

8. Multi-step composite drill bit according to claim 1, characterized in that the step drill bit (1) is cemented carbide.

9. Multi-step composite drill bit according to claim 1, characterized in that the shank (2) is tool steel.

10. Multi-step composite drill bit according to any of claims 1-9, characterized in that the point angle of the step drill bit (1) is between 135 ° and 142 °.