CN201543872U

CN201543872U - Composite structure of micro drill bit

Info

Publication number: CN201543872U
Application number: CN200920244796XU
Authority: CN
Inventors: 钟淼芳
Original assignee: Individual
Current assignee: Individual
Priority date: 2009-11-06
Filing date: 2009-11-06
Publication date: 2010-08-11
Anticipated expiration: 2019-11-06

Abstract

The utility model relates to a composite structure of a micro drill bit, which comprises a sintering body with a powder metallurgical drill handle piece as first metal powder and a sintering body with a powder metallurgical drill body piece as second metal powder. A combination part is arranged at one axial end of the sintering body with the powder metallurgical drill handle piece as the first metal powder. A cutting edge and a scrap outlet groove are arranged at the peripheral rim of the sintering body with the powder metallurgical drill body piece as the second metal powder, a combination part is also arranged at one axial end of the sintering body, and a drill tip is arranged at the other end. The combination parts of the powder metallurgical drill handle piece and the powder metallurgical drill body piece are concentrically and oppositely sintered into a whole so as to form a sintering fixation part fused by the first metal powder and the second metal powder, thereby realizing integrated forming of accurate dual-segment material injection. The composite structure of the micro drill bit can raise the structural intensity and the torsion resisting force, reduce the manufacturing and processing procedures, lower the production cost, and is more suitable for automatic mass production.

Description

The microbit composite construction

Technical field

The utility model relates to a kind of drill bit, particularly relates to a kind of required microbit composite construction of accurate industry (as being used for circuit boring) that is used for.

Background technology

Development along with electronic industry, making rapid progress of electronic product, printed circuit board (PCB) (Printed Circuit Board now, PCB) size is more and more littler, relative, operated implement required in the manufacturing process is also more and more accurate, it is more tiny than general drill bit wherein to be used for the drill bit that printed circuit board drilling uses, and this is used for the microbit that printed circuit board drilling uses and belongs to consumptive material, make this kind microbit usually with batch mode production, therefore if can simplify the manufacture of microbit, one reduces the manufacturing cost of microbit surely.

Known microbit comprises a shank part and a drill body part, wherein the material of shank part is that stainless steel is made, its diameter is generally 3.2mm, the material of drill body part is that wolfram steel is made, its diameter is 1.42mm before grinding, and generally in the majority in the mode that heat is inserted as for the mode that drill body part combines with shank part, it is that shank part is heated that so-called heat is inserted, so that the shrinkage pool diameter of shank part front end becomes greatly because of heat expansion, the nose bar with drill body part inserts wherein again.In addition, it is to finish in cold slotting mode that part is also arranged, that is makes shank part and drill body part be compelled to pressing at normal temperatures to reach the purpose that combines with the principle of interference engagement.Yet no matter be that heat is inserted or cold slotting mode, the degree of depth that drill body part inserts shank part needs 5mm to 6mm at least, just can make and produce enough pull-out capacities between the two.

But the shank part of this microbit and drill body part must via metalworking machinery respectively cutting and grinding make shrinkage pool and relative nose bar so that labor intensive and time, increase manufacturing cost.Especially it is fixed that the nose bar of the shrinkage pool of shank part and drill body part is made as general circular cross-section sleeve each other, but not radially blocking effect of the circular docking mode of this kind, cause the shank part combination drill body part of microbit can't more promote twisting resistance, and have influence on whole consolidated combination chucking power relatively.Therefore to how to improve the problems referred to above and defective, be the direction of relevant research and development that the dealer desires most ardently.

The utility model content

Main purpose of the present utility model and effect are, the binding site of powder metallurgy drillstock spare and powder metallurgy brill body spare is the integrally formed sintering set of relatively-high temperature welding position concentrically with respect to one another, reaching accurately two sections shoots material one-body molded, can promote structural strength and twisting resistance, and reduce and make procedure, be more suitable for the automated manufacturing volume production, reduce production costs.

For reaching above-mentioned purpose, the utility model microbit comprises: a powder metallurgy drillstock spare is made as the sintered body of first metal dust, and its axial end has a binding site; One powder metallurgy bores the sintered body that body spare is made as second metal dust, and its outer peripheral edges are provided with cutting blade and flute, have a binding site in an axial end, and the other end is made as apex point; The binding site that this powder metallurgy drillstock spare and powder metallurgy bore body spare is made as concentric relative sintering integrated each other, to constitute a sintering set position of first metal dust and second metal dust welding one each other.

In a preferred embodiment, this powder metallurgy drillstock spare and powder metallurgy bore body spare binding site toward each other end face constitute sintering set position.

In a preferred embodiment, the binding site inner peripheral of this powder metallurgy drillstock spare is coated on the binding site outer peripheral edges that powder metallurgy bores body spare, and its interior outer peripheral edges welding to each other constitute another sintering set position.

Further, this powder metallurgy drillstock spare is made as the sintered body of stainless steel metal powder, and this powder metallurgy bores the sintered body that body spare is made as the tungsten carbide metal powder.

Description of drawings

Fig. 1 is the utility model preferred embodiment microbit stereogram;

Fig. 2 is Fig. 1 microbit front view;

Fig. 3 is Fig. 2 microbit bonding state figure that shoots material;

Fig. 4 is Fig. 3 microbit bonding state enlarged drawing that shoots material

Fig. 5 is Fig. 4 microbit binding site high temperature sintering moulding enlarged diagram;

Fig. 6 is another preferred embodiment microbit schematic diagram of the utility model;

Fig. 7 is Fig. 6 microbit binding site enlarged drawing that shoots material;

Fig. 8 is Fig. 7 microbit binding site high temperature sintering shaping schematic view;

Fig. 9 is Fig. 8 microbit binding site sectional view.

Main description of reference numerals

1 microbit, 11 flutes

2 powder metallurgy drillstock spares, 12 apex points

3 first metal dusts, 13 sintering set positions

4 sintered bodies, 14 end faces

5 binding sites, 15 end faces

6 powder metallurgy bore body spare 16 sintering set positions

7 second metal dusts, 17 inner peripherals

8 sintered bodies, 18 outer peripheral edges

9 binding sites

10 cutting blades

The specific embodiment

For reaching above-mentioned purpose, technological means that is adopted and effect thereof now enumerate possible embodiments, and conjunction with figs. are described as follows for the utility model:

At first, see also Fig. 1 and Fig. 2, the utility model microbit 1 is applicable on the circuit board holes, to make the conductive through hole of connecting circuit inner cord circuit.As shown in FIG., the utility model microbit 1 mainly bores body spare 6 with a stainless steel metal powder metallurgy drillstock spare 2 high temperature sintering sets one tungsten carbide metal powder metallurgy, to save tungsten carbide metal material use amount.

In the preferred embodiment shown in Fig. 1 to 5, the utility model microbit 1 is made as the closely sintered body 4 of set of first metal (stainless steel) powder 3 with powder metallurgy drillstock spare 2, and its axial end has a binding site 5.Powder metallurgy bores body spare 6 and then is made as the closely sintered body 8 of set of second metal (tungsten carbide) powder 7, and its outer peripheral edges are provided with cutting blade 10 and flute 11, have a binding site 9 in an axial end, and the other end is made as apex point 12.

The utility model microbit 1 is implemented two sections by powder metallurgy Jet forming machine and mould and is shot material one-body molded, at first in mould, shoot material and make powder metallurgy brill body spare 6 semi-finished product, metallurgical drillstock spare 2 semi-finished product of the combining powder that shoots material again, carry out high temperature sintering then, make powder metallurgy drillstock spare 2 and powder metallurgy bore the binding site 5 of body spare 6,9 is sintering integrated relatively concentrically with respect to one another, to constitute a sintering set position 13 of first metal dust 3 and second metal dust, 7 welding one each other, reaching accurately two sections shoots material one-body molded, can promote structural strength and twisting resistance, and reduce and make procedure, be more suitable for the automated manufacturing volume production, reduce production costs.

Go on to say the utility model microbit 1 composite structural design, shown in Fig. 1 to 5, powder metallurgy drillstock spare 2 is provided with

opposing end surface

14,15 with the

binding site

5,9 that powder metallurgy bores body spare 6, makes

end face

14,15 formation sintering set positions 13 toward each other, to be made into integration microbit 1.

In another preferred embodiment shown in Fig. 6 to 9, the

binding site

5,9 that powder metallurgy drillstock spare 2 and powder metallurgy bore body spare 6 is except constituting the sintering set positions 13 with

end face

14,15 toward each other, and as shown in FIG., binding site 5 inner peripherals 17 of powder metallurgy drillstock spare 2 are coated on binding site 9 outer peripheral edges 18 that powder metallurgy bores body spare 6, make in it outer

peripheral edges

17,18 to each other welding constitute another sintering set position 16, to improve structural strength.

In sum, the

binding site

5,9 that the utility model microbit 1 bores body spare 6 with powder metallurgy drillstock spare 2 and powder metallurgy is the integrally formed sintering set of relatively-high temperature welding position 13 concentrically with respect to one another, reaching accurately two sections shoots material one-body molded, can promote structural strength and twisting resistance, and reduce and make procedure, be more suitable for the automated manufacturing volume production, reduce production costs.

Above illustrated embodiment is only used the utility model for convenience of description, and is not in a limitative way, and is not breaking away from the utility model spirit category, and various simple and easy variation and modification that the those skilled in the art can do all must be contained in the scope of claims.

Claims

1. microbit composite construction, it is characterized in that it comprises: a powder metallurgy drillstock spare is made as the sintered body of first metal dust, and its axial end has a binding site; One powder metallurgy bores the sintered body that body spare is made as second metal dust, and its outer peripheral edges are provided with cutting blade and flute, have a binding site in an axial end, and the other end is made as apex point; The binding site that this powder metallurgy drillstock spare and powder metallurgy bore body spare is made as concentric relative sintering integrated each other, to constitute a sintering set position of first metal dust and second metal dust welding one each other.

2. according to the described microbit composite construction of claim 1, it is characterized in that the binding site of this powder metallurgy drillstock spare and powder metallurgy brill body spare end face toward each other constitutes sintering set position.

3. according to claim 1 or 2 described microbit composite constructions, it is characterized in that, the binding site inner peripheral of this powder metallurgy drillstock spare is coated on the binding site outer peripheral edges that powder metallurgy bores body spare, and its interior outer peripheral edges welding to each other constitute another sintering set position.

4. according to the described microbit composite construction of claim 3, it is characterized in that this powder metallurgy drillstock spare is made as the sintered body of stainless steel metal powder, this powder metallurgy bores the sintered body that body spare is made as the tungsten carbide metal powder.