CN218699795U

CN218699795U - Spiral hole digger

Info

Publication number: CN218699795U
Application number: CN202223007763.8U
Authority: CN
Inventors: 胥晓强
Original assignee: Mianyang Yasen Hardware Tool Co ltd
Current assignee: Mianyang Yasen Hardware Tool Co ltd
Priority date: 2022-11-11
Filing date: 2022-11-11
Publication date: 2023-03-24
Anticipated expiration: 2032-11-11

Abstract

The utility model discloses a spiral hole digger, wherein spiral grooves are symmetrically arranged on two sides of a tool bit respectively, and spiral auxiliary grooves are symmetrically arranged on the tool bit between adjacent spiral grooves respectively; a rear angle clearance inclined plane with the height difference of Lh is arranged between the front end surface of the cutter head and the spiral auxiliary groove; an alloy blade is arranged in the middle of the front end face of the cutter head, and a positioning center point is arranged at the central position of the alloy blade; alloy spiral grooves communicated with the spiral grooves are arranged on the side faces, close to the spiral grooves, of the alloy blades on the two sides, and arc-shaped cutting main cutting edges with the length of hL, the height difference of h1 and the gradually increasing back angle from the center position to the outer diameter position are respectively arranged on the side edges; and the tail end of the cutting main cutting edge is provided with an arc scribing edge higher than the cutting main cutting edge h 2. The utility model discloses can effectual solution chip removal difficulty problem, and the design of cutting blade and circular arc marking off sword makes the cutting resistance littleer, and the pore wall is more smooth, has prolonged life.

Description

Spiral hole digger

Technical Field

The utility model belongs to the technical field of the hole digger, concretely relates to spiral hole digger.

Background

The existing wood drill bit in the market has the defects that the hole wall is rough, the phenomenon that a cutter cannot smoothly discharge chips, the cutting resistance is large, the cutter is burnt, the conditions of edge explosion and the like of a processed plate are caused, the service life of the cutter is short and the like in the use process of the drill bit due to the reasons of product design and the like. As shown in fig. 1 and 2, the chip discharge grooves of the conventional tappers on the market are generally small, which is not beneficial to timely discharging various scraps generated during processing, and is easy to cause increase of the friction coefficient of the drill bit, heating of the cutter and even burning of the cutter. The design of cutting edge is straight sword mode, is unfavorable for in time being add man-hour involving into cutter body chip groove to the sweeps that produces when cutting, influences cutting effect. The design of the marking blade is triangular point marking, so that the situation of point abrasion and even blade breakage is easily caused during use, and the situation of edge burst and the like of a processed plate is caused. Due to the design and structure of the hole digger, the service life of the hole digger is not long.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a spiral hole digger aims at solving above-mentioned problem.

The utility model discloses mainly realize through following technical scheme:

a spiral hole digger comprises a cutter bar and a cutter head, wherein spiral grooves are symmetrically arranged on two sides of the cutter head respectively, and spiral auxiliary grooves are symmetrically arranged on the cutter head between every two adjacent spiral grooves respectively; a rear angle clearance inclined plane with the height difference of Lh is arranged between the front end surface of the cutter head and the spiral auxiliary groove; the alloy blade is arranged in the middle of the front end face of the cutter head, a positioning center point is arranged at the center position of the alloy blade, and alloy spiral grooves communicated with the spiral grooves are formed in the side faces, close to the spiral grooves, of the alloy blades on the two sides of the positioning center point; the side edges, close to the spiral groove, of the alloy blades on the two sides of the positioning center point are respectively provided with a circular arc cutting main cutting edge with the length of hL and the height difference of h1, and the back angle of the circular arc cutting main cutting edge gradually increases from the center position to the outer diameter position; and the tail end of the cutting main cutting edge is provided with an arc scribing blade higher than the cutting main cutting edge h 2.

In order to better realize the utility model, the length hL of the cutting main cutting edge is 14mm to 17mm, and the height difference h1 is 0.2mm to 0.5mm.

In order to better realize the utility model, further, h2 is 0.2mm to 0.5mm.

In order to better realize the utility model discloses, further, the size of alloy helicla flute is P, wherein, P = R12~ R18.

In order to better realize the utility model, furthermore, the height h of the center point of the positioning center is 1mm to 1.5mm.

In order to better realize the utility model, the width of the alloy blade is d, and the length of the alloy blade is L, wherein d =3mm to 6mm, and L =30mm to 38mm.

The utility model has the advantages as follows:

the chip groove of the tapper is the design principle of a large spiral groove and a spiral auxiliary groove, and then an alloy spiral groove is added, so that the situation that the chip removal is difficult can be effectively solved in the processing process of the drill bit. The cutting main cutting edge is designed into a circular arc, the back angle is gradually increased from the central position to the outer diameter position and has a height difference, and the cutting main cutting edge has the functions of facilitating auxiliary positioning of a center point positioning center and reducing cutting resistance during cutting. The design of the arc scribing blade is changed from the conventional point-based scribing by the point scribing into the arc surface scribing, the strength of the scribing blade is higher during cutting, the abrasion or edge breaking condition is not easy to occur, the scribing contact surface is enlarged, the processed hole wall is smoother, and the effect is better. The utility model discloses unique cutting blade and circular arc marking blade design make the drill bit cutting resistance when using littleer, and the pore wall is more smooth, has prolonged life, has better practicality.

Drawings

Fig. 1 is a front view of a conventional hole cutter;

fig. 2 is a right side view of the conventional hole cutter;

fig. 3 is a schematic perspective view of the hole opener of the present invention;

fig. 4 is a right side view of the hole cutter of the present invention;

FIG. 5 is a schematic diagram of the dimensional structure of an alloy blade;

FIG. 6 is a schematic diagram of the dimensional structure of an alloy spiral groove;

FIG. 7 is a schematic diagram of the dimensional structure of the main cutting edge and the circular arc scribing edge;

fig. 8 is a schematic structural view of the relief angle chamfer.

Wherein: 1. spiral groove, 2 spiral auxiliary groove, 3 cutting main cutting edge and 4 arc scribing edge.

Detailed Description

Example 1:

a spiral hole digger comprises a cutter bar and a cutter head, wherein spiral grooves 1 are symmetrically formed in two sides of the cutter head respectively, and spiral auxiliary grooves 2 are symmetrically formed in the cutter head between every two adjacent spiral grooves 1 respectively; a rear angle clearance inclined plane with the height difference of Lh is arranged between the front end surface of the cutter head and the spiral auxiliary groove 2; the alloy blade is arranged in the middle of the front end face of the cutter head, a positioning center point is arranged in the center of the alloy blade, and alloy spiral grooves 1 communicated with the spiral grooves 1 are formed in the side faces, close to the spiral grooves 1, of the alloy blades on the two sides of the positioning center point; the side edges, close to the spiral groove 1, of the alloy blades on the two sides of the positioning center point are respectively provided with a circular arc cutting main cutting edge 3, the length of the circular arc cutting main cutting edge is hL, the height difference of the circular arc cutting main cutting edge is h1, and the back angle of the circular arc cutting main cutting edge gradually increases from the center position to the outer diameter position; and the tail end of the cutting main cutting edge 3 is provided with an arc scribing blade 4 higher than the cutting main cutting edge 3h 2.

Preferably, as shown in fig. 5, the alloy blade has a width d and a length L, wherein d =3mm to 6mm, and L =30mm to 38mm. The alloy blade can be welded with the cutter head integrally.

Preferably, as shown in fig. 7, the cutting main cutting edge 3 has a length hL of 14mm to 17mm and a height difference h1 of 0.2mm to 0.5mm. H2 is 0.2mm to 0.5mm.

When a plate is processed, the center of a circle needing to be punched is processed and positioned through the positioning center point, then the circumference of the circle is processed through the arc marking blade 4, finally the plate from the center of the circle to the circumference is cut through the cutting main cutting edge 3, and scraps generated in the processing are discharged through the alloy spiral groove 1, the large spiral groove 1 and the spiral auxiliary groove 2, so that the punching processing is completed. The chip groove of the tapper is the design principle of a large spiral groove 1 and a spiral auxiliary groove 2, and then an alloy spiral groove 1 is added, so that the situation of chip removal difficulty of a drill bit can be effectively solved in the processing process. The cutting main cutting edge 3 is designed into an arc, the back angle is gradually increased from the central position to the outer diameter position and has a height difference, and the cutting main cutting edge has the functions of facilitating auxiliary positioning of a center point positioning center and reducing cutting resistance during cutting. The design of the arc scribing blade 4 is changed from the conventional point-based scribing by a point scribing into an arc surface scribing, the strength of the scribing blade is higher during cutting, the abrasion or edge breaking condition is not easy to occur, the scribing contact surface is enlarged, the processed hole wall is smoother, and the effect is better. The utility model discloses unique cutting blade and 4 designs of circular arc marking off sword make the drill bit cutting resistance when using littleer, and the pore wall is more smooth, has prolonged life.

Example 2:

a screw-type hole cutter, as shown in fig. 3-8, comprises a steel body and an alloy. A symmetrical alloy welding groove with the width of d (d =3 mm-6 mm) is formed in the center of a steel machine body cutter head, and 2 symmetrical large spiral grooves 1 and spiral auxiliary grooves 2 are milled on the side of the groove 2 respectively. As shown in fig. 8, 2 clearance inclined planes with a height difference Lh are symmetrically milled on the planes of the central groove and the spiral auxiliary groove 2.

As shown in fig. 3 and 5, an alloy piece with a width of d (d =3mm to 6 mm) and a length of L (L =30mm to 38mm) is inserted into the central groove of the cutter head. The two parts are connected into a whole by welding.

As shown in fig. 6, 2 symmetrical alloy helical grooves 1 with the size P (P = R12 to R18) connected to the blade body helical groove 1 are ground on the alloy blade.

As shown in fig. 7, on the alloy insert at the center position of the insert head, a positioning center point with a height h (h =1mm to 1.5 mm) was machined, 2 cutting main edges 3 with a height h (hL =14mm to 17mm) and a height difference h1 (h 1=0.2mm to 0.5 mm) were machined on 2 sides of the positioning center point, the cutting edges were designed to be circular arcs, and the relief angles increased from the center position to the outer diameter position. And (3) machining 2 symmetrical arc scribing edges 4 higher than the main cutting edge h2 (h 2=0.2mm to 0.5mm) at the tail end of the cutting main cutting edge 3.

When the device is used, various wood and soft plastic plates are mainly processed. When a plate is processed, firstly, the center of a circle needing to be punched is processed and positioned through the positioning center point, then the circumference of the circle is processed through the arc marking blade 4, finally, the plate from the center of the circle to the circumference is cut through the cutting main cutting edge 3, and the scraps generated in the processing are discharged through the alloy spiral groove 1, the large spiral groove 1 and the spiral auxiliary groove 2, so that the punching processing is completed.

The chip groove of the cutter body is designed into 4 spiral chip grooves which are respectively symmetrical by a main chip groove and a sub chip groove. In the process of machining the drill bit, scraps produced in machining can be discharged in time. The cutting main cutting edge 3 is designed to be arc-shaped, and the back angle is gradually increased from the central position to the outer diameter position and has a height difference; the center point positioning center can be assisted and positioned during cutting, and the cutting resistance is reduced. The design of the arc scribing blade 4 is changed from the conventional point-based scribing by a sharp point scribing into the arc surface scribing, the strength of the scribing blade is higher during cutting, the abrasion or edge breaking condition is not easy to occur, the scribing contact surface is enlarged, the processed hole wall is smoother, and the effect is better. Combine above advantage, the utility model discloses the hole digger, more conventional hole digger practical life is longer, and the processing effect is better.

The above is only the preferred embodiment of the present invention, not to the limitation of the present invention in any form, all the technical matters of the present invention all fall into the protection scope of the present invention to any simple modification and equivalent change of the above embodiments.

Claims

1. A spiral hole digger is characterized by comprising a cutter bar and a cutter head, wherein spiral grooves (1) are respectively and symmetrically arranged on two sides of the cutter head, and spiral auxiliary grooves (2) are respectively and symmetrically arranged on the cutter head between every two adjacent spiral grooves (1); a rear angle clearance inclined plane with the height difference of Lh is arranged between the front end surface of the cutter head and the spiral auxiliary groove (2); the alloy blade is arranged in the middle of the front end face of the cutter head, a positioning center point is arranged in the center of the alloy blade, and alloy spiral grooves (1) communicated with the spiral grooves (1) are formed in the side faces, close to the spiral grooves (1), of the alloy blades on the two sides of the positioning center point; the side edges, close to the spiral groove (1), of the alloy blades on two sides of the positioning center point are respectively provided with a circular arc cutting main cutting edge (3) which is h1 in height and h L in length and gradually increases in back angle from the center position to the outer diameter position; and the tail end of the cutting main cutting edge (3) is provided with an arc scribing edge (4) higher than the h2 height of the cutting main cutting edge (3).

2. A screw-type hole opener according to claim 1, wherein the cutting main cutting edge (3) has a length hL of 14mm to 17mm and a height difference h1 of 0.2mm to 0.5mm.

3. A screw-type hole opener according to claim 2, wherein h2 is 0.2mm to 0.5mm.

4. A screw-type hole opener according to any one of claims 1-3, wherein the size of the alloy spiral groove (1) is P, where P = R12-R18.

5. A screw-type hole opener according to any one of claims 1 to 3, wherein the height h of the positioning center point is 1mm to 1.5mm.

6. A screw-type hole opener according to claim 1, wherein the alloy blade has a width d and a length L, and wherein d =3mm to 6mm, and L =30mm to 38mm.