CN202606943U

CN202606943U - Four-edge molding drill cutter for through holes

Info

Publication number: CN202606943U
Application number: CN 201220288819
Authority: CN
Inventors: 许锋; 王法民; 余长元; 蔡志华
Original assignee: WUHAN TYLLS TOOLS CO Ltd
Current assignee: WUHAN TYLLS TOOLS CO Ltd
Priority date: 2012-06-19
Filing date: 2012-06-19
Publication date: 2012-12-19
Anticipated expiration: 2022-06-19

Abstract

The utility model discloses a four-edge molding drill cutter for through holes. The four-edge molding drill cutter comprises a cutter main body and a cutter handle, wherein the cutter main body comprises two main cutting edges, a scrap discharging groove, two main edge belts, two auxiliary edge belts, a rear cutter surface and a drill core; a chamfer with the radius R of 0.03 to 0.04mm is formed at the cutting edge of each auxiliary edge belt; a chamfer is formed at the junction between the auxiliary edge belts and the rear cutter surface; the two main edge belts are symmetrically distributed; the two auxiliary edge belts are also symmetrically distributed; the width B of each main edge belt, the width B1 of each auxiliary edge belt and the edge diameter D of the cutter correspond to the relationship of B=B1=0.04D to 0.07D; and the diameter q of the drill core and the edge diameter D of the cutter correspond to the relationship of q=0.3D. The four-edge molding drill cutter has the advantages that the guiding stability of auxiliary guiding edges in the process of machining the through holes can be improved in the process of machining the through holes, so that the through holes can be drilled and reamed at a time on the premise of ensuring the service life of the cutter, the machining accuracy of the holes can reach IT6 to IT7, and the surface roughness of the holes can be more than Ra0.8.

Description

A kind of through hole bores cutter with four sword moulding

Technical field

The utility model belongs to metal machining tool class, is specifically related to a kind of through hole and bores cutter with four sword moulding.

Background technology

Through hole be two each other vertical and two have hole interrelated, that join, exist intersection each other, promptly two holes link to each other the distance of center lines less than the hole of two pore radius sums.When machining, second hole and manufactured first Kong Zaikong pass through the place mutually with existing between the hole is vertical each other, promptly produce intersection.Instrument will pass through intersection in working angles, so instrument will produce discontinuous cutting phenomenon and characteristics, and bit force changes greatly, and the blade of instrument can receive very big impact when incision cuts out the intersection position.Therefore, drill bit must have enough stability in boring the through hole process, must adopt multi-point support to stablize the cutting state of entire tool, and instrument could guarantee the precision in processed hole.

Common fluted drill is when processing phase perforation, and tool bearing point is fewer, has only two main lands; It is supporting the cutter local location, when incision intersection position, has only a main land in supporting, and another main land is in unsettled cutting; Stability is poor, so borehole accuracy is also poor.

The utility model content

Not enough in order to overcome common spiral bit precision when processing through hole; The utility model provides a kind of through hole to bore cutter with four sword moulding; Can when the processing through hole, improve the guiding stability of secondary guiding sword in the through hole process; Make cutter under the prerequisite that guarantees the life-span, realize boring, cutting with scissors one-shot forming, the precision in hole can reach IT6-IT7, and surface roughness reaches more than the Ra0.8.

For reaching above purpose, the utility model adopts following technical scheme:

A kind of through hole bores cutter with four sword moulding, comprises cutter body and handle of a knife, and cutter body comprises two main cutting edges, chip area, two main lands, two secondary lands, back knife faces, bores core.

Described secondary land cutting edge place makes R, and the value of R is 0.03-0.04mm; Secondary land is established chamfering with back knife face intersection.

Described two main lands are symmetrical distribution, and two secondary lands also are symmetrical distribution, and the relation of the width of the width B of main land, secondary land B1 and cutter sword footpath D is B=B ₁=0.04D～0.07D.

The relation of said brill core diameter q and cutter sword footpath D is q=0.3D.

Compared with prior art, the utlity model has following characteristics and progress:

1. to the optimization of auxiliary land, the processing of falling R of secondary land cutting edge makes the front cutting edge passivation not participate in cutting, only plays auxiliary guiding extruding, guarantees the stability of guiding.Because secondary land place does not have chip space, participated in cutting if secondary land cutting edge is sharp, the iron filings powder can get lodged between main land and the auxiliary land, can cause moment of torsion to increase, and secondary land guiding is unstable.

2. secondary land is made chamfering with back knife face intersection, and blade tip is destroyed by the hole wall of through hole when avoiding the incision of pair guiding sword.

3. increase the design of boring core diameter and guaranteed that cutter can keep stability in impact.

The stability that these measures make a kind of through hole of the utility model bore cutter with four sword moulding is brought into play in through hole processing fully, make the precision in processed hole can reach IT6-IT7, and the life-span reaches the requirement of practice.

Description of drawings

Fig. 1 is the overall structure sketch map of the utility model;

Fig. 2 is that the A of Fig. 1 is to structural representation;

Fig. 3 is the enlarged diagram of M among Fig. 1;

Fig. 4 is the enlarged diagram of N among Fig. 2.

Wherein: 1. cutter body, 2. handle of a knife, 3. main cutting edge, 4. back knife face, 5. main land, 6. secondary land, 7. chip area 8. bores core, 9. chamfering, q. bores core diameter, and D. cutter sword is directly.

The specific embodiment

Below in conjunction with accompanying drawing the utility model is described in further detail:

Like Fig. 1-shown in Figure 4, a kind of through hole bores cutter with four sword moulding, comprises cutter body 1 and handle of a knife 2, and cutter body 1 comprises two main cutting edges 3, chip area 7, two main lands 5, two secondary lands 6, back knife faces 4, bores core 8.

4. like Fig. 3, shown in Figure 4, the cutting edge place of described secondary land 5 makes R, and the value of R is 0.03-0.04mm, makes the front cutting edge passivation not participate in cutting, only plays auxiliary guiding extruding, guarantees the stability of guiding; Secondary land 5 is provided with chamfering 9 with back knife face 4 intersections, and blade tip is struck off when avoiding the incision of pair guiding sword.

As shown in Figure 2, described two main lands 5 are symmetrical distribution, and two secondary lands 6 also are symmetrical distribution, are symmetrically distributed to help the guiding of land, and the width B 1 of the width B of main land 5, secondary land 6 is B=B with the relation of cutter sword footpath D ₁=0.04D～0.07D.

Like Fig. 1, shown in Figure 2, increase and bore core diameter, promptly bore the q=0.3D that concerns of core diameter q and cutter sword footpath D, guaranteed the rigidity of drill bit.

Above embodiment is only in order to explain the technical scheme of the utility model; But not to its restriction, although with reference to previous embodiment the utility model has been carried out detailed explanation, those of ordinary skill in the art is to be understood that; It still can be made amendment to the technical scheme of aforementioned each embodiment record; Or its part technical characterictic is equal to replacement, and these modifications or replacement do not make the essence of relevant art scheme break away from the spirit and the scope of the utility model technical scheme.

Claims

1. a through hole bores cutter with four sword moulding, it is characterized in that, comprises cutter body (1) and handle of a knife (2), and cutter body (1) comprises two main cutting edges (3), chip area (7), two main lands (5), two secondary lands (6), back knife face (4), bores core (8).

2. a kind of through hole according to claim 1 bores cutter with four sword moulding, it is characterized in that, described secondary land (6) cutting edge place makes R, and the value of R is 0.03-0.04mm; Secondary land (6) and back knife face (4) intersection are established chamfering (9).

3. a kind of through hole according to claim 1 bores cutter with four sword moulding; It is characterized in that; Described two main lands (5) are symmetrical distribution, and two secondary lands (6) also are symmetrical distribution, and the relation of the width of the width B of main land (5), secondary land (6) B1 and cutter sword footpath D is B=B ₁=0.04D～0.07D.

4. a kind of through hole according to claim 1 bores cutter with four sword moulding, it is characterized in that, the relation of the diameter q of said brill core (8) and cutter sword footpath D is q=0.3D.