CN220515509U - Three-blade drill without reaming - Google Patents

Abstract

The utility model discloses a three-blade drill bit without reaming, which relates to the technical field of drill bits and comprises a drill bit body, wherein the drill bit body comprises: a handle and a cutting part fixedly connected with one end of the handle; the cutting part is of a three-blade structure and is supported by three ligaments at intervals, and chip grooves are formed between every two three ligaments; one end of the three ligaments, which is far away from the handle, is provided with a bent groove front angle straight cutting edge, and the three groove front angle straight cutting edges extend to the center of the drill bit body to form a rotary drill point structure; the three-blade structure drill bit has more cutting blades relative to the blade drill bit, so that the cutting force can be more uniformly dispersed during cutting, and the load of each blade is reduced, thereby improving the cutting efficiency, and the rotary drill point can effectively reduce the cutting resistance, so that the cutting is easier and smoother; and helps to reduce tool wear and extend tool life, resulting in smoother, finer cutting surfaces, reduced burrs and roughness.

Description

Three-blade drill without reaming

Technical Field

The utility model relates to the technical field of drills, in particular to a three-blade drill without reaming.

Background

A drill bit is a tool for drilling holes and is typically attached to an electric drill or a manual arbor. It can be used to cut circular holes in various materials such as metal, wood, plastic, concrete, etc. The design and use of the drill bit varies to accommodate different materials and drilling requirements.

The following are some common drill bit types:

metal drill bit: is used exclusively for drilling holes in metal surfaces, usually made of high-speed steel, with hardness and wear resistance to adapt to the characteristics of the metal material.

Woodworking drill bit: is suitable for drilling wood, typically with sharp cutting edges and deep threads to help remove cuttings and reduce the likelihood of seizing.

Concrete drill bit: for drilling holes in hard materials such as concrete, brick, etc., it is common to have carbide tips and special thread designs to effectively penetrate the hard material.

Ceramic drill bit: for drilling holes in brittle materials such as ceramics, tiles, etc., it is common to have special drill bit geometries to reduce the risk of material breakage.

Glass drill bit: similar to ceramic drills for drilling holes in glass and other brittle materials, and the like.

The choice of the appropriate bit type depends on the material you want to drill and the pore size. When using the drill bit, care must be taken to be safe, to wear appropriate personal protective equipment, and to adjust the rotational speed and feed rate of the drill bit according to the characteristics of the material and the drilling requirements.

Most of the drills used in the current market are 2 cutting edges, and the drills have the defects of poor machining precision, low surface finish, poor position degree, limited application occasions and poor machining support, so that the drills continuously jump and strike the workpiece wall in the machining process, the drill tip of the drills is unstable in centering and the roundness of the holes is poor in the machining process. The life of the drill bit is reduced. Accordingly, the prior art is still in need of improvement and development.

From the above, we have devised a triple-cutting bit without reaming to solve the above problems.

Disclosure of Invention

The utility model aims to solve the defects in the prior art, and provides a three-blade drill without reaming.

In order to achieve the above purpose, the present utility model adopts the following technical scheme:

a three-bladed drill without reaming, comprising a drill body, the drill body comprising:

a handle and a cutting part fixedly connected with one end of the handle;

the cutting part is of a three-blade structure and is supported by three ligaments at intervals, and chip grooves are formed between every two three ligaments;

one end of the three ligaments, which is far away from the handle, is provided with a bent groove front angle straight cutting edge, and the three groove front angle straight cutting edges extend to the center of the drill bit body to form a rotary drill point structure;

the center of the drill point structure forms a drill core, and the core thickness of the drill core is 33-35% D.

Preferably, the angle between the triple ligament and the flute rake straight cutting edge is 0 DEG + -1 deg.

Preferably, the angle between the point structure and the central axis of the bit body is a point angle, and the angle of the point angle is 140 degrees+ -2 degrees.

Preferably, each of the three ligaments has a thickness of 4.4% d to 5% d.

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

1. the three-blade type structure drill bit has more cutting blades relative to the blade drill bit, so that the cutting force can be more uniformly dispersed during cutting, the load of each blade is reduced, the cutting efficiency is improved, the processing vibration is effectively restrained during drilling, and the precision of the hole is ensured during high-speed drilling. Compared with an edge drill, the three-edge drill has higher hole precision, and the three-edge design can reduce the width of a single cutting edge and reduce cutting resistance, so that the heat generation of a cutter and a workpiece is reduced, the service life of the cutter is prolonged, and the three-edge structure drill possibly generates smaller chips due to smaller cutting quantity of each edge, thereby being beneficial to better removing cutting chips and reducing cutter clamping phenomenon.

2. The three groove front angle straight cutting edges extend to the center of the drill bit body to form a rotary drill tip structure, and the design of the rotary drill tip can effectively reduce cutting resistance, so that cutting is easier and smoother; this helps reduce tool wear and extend tool life, better guides and positions when entering the workpiece, helps accurately control the position and geometry of the borehole, and is smoother during cutting, it can produce smoother, finer cutting surfaces, reduce burrs and roughness, and at the same time, it is suitable for high speed machining, and can accomplish cutting tasks in a shorter time.

3. The edge drill has the advantages of larger central core thickness, good rigidity, higher cutting efficiency and capability of processing more stably and more efficiently; under the condition of high-load cutting, the larger drill tip core thickness can better disperse cutting force, reduce the load of a single cutting edge, and further reduce cutter abrasion; and the thick design of the drill tip may make the drill more suitable for cutting hard materials, which may create greater impact and pressure on the tool.

Drawings

FIG. 1 is a schematic view of a triple-edged drill without reaming according to the present utility model;

fig. 2 is a front view of a triple-edged drill without reaming according to the present utility model.

In the figure: 1 groove rake straight cutting edge, 2 core, 3 drill point structure, 4 junk slots, 5 three ligaments, 6 stalk portions, 7 bit body, 8 cutting portions.

Detailed Description

In order to make the technical means, the creation features, the achievement of the purposes and the effects of the present utility model easy to understand, the technical solutions of the embodiments of the present utility model will be clearly and completely described below with reference to the drawings in the embodiments of the present utility model, and it is apparent that the described embodiments are only some embodiments of the present utility model, not all embodiments.

Example 1

Referring to fig. 1-2, a triple-tipped drill without reaming includes a drill body 7, the drill body 7 comprising:

a shank 6 and a cutting portion 8 fixedly connected to one end of the shank 6;

in the embodiment, the cutting part 8 is of a three-blade structure and is supported by three ligaments 5 at intervals of 120 degrees, chip grooves 4 are arranged between every two three ligaments 5, and the thickness of each three ligament 5 is 4.4-5%D; the drilling machine can effectively restrain machining vibration during drilling, and ensure the precision of holes during high-speed drilling. Compared with 2-edge drilling, 3-edge drilling has higher hole precision. One blade replaces the traditional 2-blade drill bit plus reamer. The machining precision can reach IT8/IT9 precision;

wherein, three-blade structure drill bit has more cutting edges than 2-blade drill bit, therefore can disperse the cutting force more evenly when cutting, reduce the load of every sword to improve cutting efficiency.

Meanwhile, when the three-blade type structure drill bit is used for cutting, due to the fact that cutting force is dispersed, the three-blade type structure drill bit can possibly generate less vibration and vibration in the cutting process, and cutting stability and machining quality can be improved.

The three-blade design can reduce the width of a single cutting blade and reduce the cutting resistance, so that the heat generation of a cutter and a workpiece is reduced, the service life of the cutter is prolonged, the better cooling and lubrication can be facilitated by the smaller cutting resistance, the heat accumulation in the cutting process is reduced, and the cutting efficiency is improved.

Wherein, because the cutting quantity of each blade is smaller, the three-blade structure drill bit can generate smaller cuttings, thereby being beneficial to better removing the cutting cuttings and reducing the cutter clamping phenomenon.

One end of the triple ligament 5, which is far away from the shank 6, is provided with a bent groove rake straight cutting edge 1, and the three groove rake straight cutting edges 1 extend to the center of the drill body 7 to form a rotary drill point structure 3.

Wherein the angle between the triple ligament 5 and the flute rake straight cutting edge 1 is 0 DEG + -1 DEG;

in this embodiment, through the design of three ligaments 5 and three flute rake straight cutting edges 1, 3 edge drills are more than 2 edge drills by 1 cutting edge, can carry out processing of higher efficiency, longer life, and straight cutting edges have ensured steady continuous gradual change of main cutting force, reduce stress concentration point, obtain even wearing and tearing volume, have improved the life-span of drill bit greatly.

Meanwhile, the design of the rotary drill point can effectively reduce cutting resistance, so that cutting is easier and smoother; this helps reduce tool wear and extend tool life, better guides and positions when entering the workpiece, helps accurately control the position and geometry of the borehole, and is smoother during cutting, it can produce smoother, finer cutting surfaces, reduce burrs and roughness, and at the same time, it is suitable for high speed machining, and can accomplish cutting tasks in a shorter time.

In this embodiment, the angle between the drill tip structure 3 and the central axis of the drill bit body 7 is the point angle, the angle of the point angle is 140++2°, the center of the drill tip structure 3 forms the drill core 2, and the core thickness of the drill core 2 is 33% d to 35% d. When the three-edge drill is used, the center core of the 3-edge drill is thicker, the rigidity is good, the cutting efficiency is higher, and the three-edge drill can be used for more stable and higher-efficiency processing.

Under the condition of high-load cutting, the larger drill tip core thickness can better disperse cutting force, reduce the load of a single cutting edge, and further reduce cutter abrasion; and the thick design of the drill tip may make the drill more suitable for cutting hard materials, which may create greater impact and pressure on the tool.

In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present utility model and simplifying the description, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present utility model, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.

The foregoing has shown and described the basic principles, principal features and advantages of the utility model. It will be appreciated by persons skilled in the art that the present utility model is not limited to the embodiments described above, but is capable of numerous variations and modifications without departing from the spirit and scope of the utility model as hereinafter claimed. The scope of the utility model is defined by the appended claims and equivalents thereof.

Claims (4)

1. A three-point drill without reaming, comprising a drill body (7), characterized in that the drill body (7) comprises:

a handle (6) and a cutting part (8) fixedly connected with one end of the handle (6);

the cutting part (8) is of a three-blade structure and is supported by three ligaments (5) at intervals of 120 degrees, and chip grooves (4) are formed between every two three ligaments (5);

one end of the triple ligament (5) far away from the handle part (6) is provided with a bent groove front angle straight cutting edge (1), and the three groove front angle straight cutting edges (1) extend to the center of the drill bit body (7) to form a rotary drill point structure (3);

the center of the drill point structure (3) forms a drill core (2), and the core thickness of the drill core (2) is 33-35% D.

2. A triple-edged drill without reaming according to claim 1, characterized in that the angle of the triple ligament (5) to the flute rake straight cutting edge (1) is 0 ° ± 1 °.

3. A three-point drill without reaming according to claim 1, characterized in that the angle between the point structure (3) and the central axis of the drill body (7) is a point angle, which is 140 ° ± 2 °.

4. A triple-tipped drill without reaming according to claim 1, characterized in that the thickness of each of the triple ligaments (5) is 4.4-5% d.