CN208408643U - A kind of high intensity UC type drill point - Google Patents

Abstract

The utility model discloses a kind of high intensity UC type drill point, including drill point ontology and shank, drill point ontology front end is provided with single apex face and three auxiliary knife faces constitute apex point, and the outer concave between apex face and an auxiliary knife face is equipped with gap；Two helical flutes are also set up on drill point ontology, helicla flute is an elongated slot and a short slot, and be parallel to each other distribution between elongated slot and short slot, and since apex point, hovers above on drill point ontology；The tapered structure in the middle section of ontology, back segment rounded two steps or multi-step formula.High intensity UC type drill point provided by the utility model, it passes through the drill point ontology of the cone cell with the UC type apex point that single apex face and three auxiliary knife faces are constituted, it can be realized under the premise of guaranteeing hole wall quality, effectively improve the intensity of drill point, the risk of some complicated plate broken needles in boring procedure can be greatly lowered, and can guarantee enough chip resistances and wearability.

Description

A kind of high intensity UC type drill point

Technical field

The utility model relates to PCB cutters, and in particular to a kind of micro drill.

Background technique

Along with electronics miniaturization, so that printed circuit board also constantly develops, dual platen, more is developed to from single layer Laminate and flex plate, and constantly develop to high-precision, high density and high reliability direction.

In order to guarantee better wall quality, the friction of drill point and hole wall is reduced, drill point is from common ST type, i.e., outside drill point Diameter is self-consistent, evolves to UC type, i.e. the head outer diameter of drill point is big, the intermediate and small design of back segment outer diameter, is boring equally in this way When the hole of outer diameter, the contact area of drill point and substrate greatly reduces, so as to reduce rubbing for drill point and hole wall in boring procedure Chafing amount can promote hole wall quality.

But it is this design so that drill point remitted its fury, often will appear the high risk of broken needle rate, especially for one The complicated plate such as a little high rigidity and thick copper, is not able to satisfy the demand in market increasingly present UC type drill point yet.

Utility model content

For the problems of existing UC type drill point, a kind of new high-intensitive UC type drill point is needed.

For this purpose, can guarantee hole wall the problem to be solved by the utility model is to provide a kind of high intensity UC type drill point Under the premise of quality, the intensity of drill point is improved, reduces the risk of broken needle.

To solve the above-mentioned problems, high intensity UC type drill point provided by the utility model comprising drill point ontology and shank, Drill point ontology front end is provided with single apex face and three auxiliary knife faces constitute apex point, between the apex face and an auxiliary knife face Outer concave is equipped with gap；Also setting up two helical flutes on the drill point ontology, the helicla flute is an elongated slot and a short slot, Be parallel to each other distribution between elongated slot and short slot, and since apex point, hovers above on drill point ontology；The middle section of the ontology is tapered Structure, back segment rounded two steps or multi-step formula.

Further, single apex face and three auxiliary knife faces, apex face have cutting edge always, and three auxiliary knife faces include Two big auxiliary knife face and one small auxiliary knife face, two big auxiliary knife face are located at the two sides of apex face, and small auxiliary knife face is located at operator The diagonal position in face, 4 knife faces form apex point by certain tilt angle, and drill point angle is 120-135 °.

Further, the outer diameter of the drill point ontology is 0.2-1.0mm, and set spiral angle is 15~50 °, short helicla flute Account for the 20%~90% of long spire slot.

Further, the depth in the recessed gap in outside between the apex face and an auxiliary knife face be bit diameter 1~ 40%, gap length accounts for the 10%~30% of drill point body length.

Further, the tapered structure in middle section of the drill point ontology, the cone cell ending rotary table rank that is connected of rear end with Front end UC outer diameter of drill point ontology is consistent, and the range of taper of cone structure is 1 °~5 °.

High intensity UC type drill point provided by the utility model, passes through the UC type being made of single apex face and three auxiliary knife faces Apex point cooperates the drill point ontology of cone cell, can be realized under the premise of guaranteeing hole wall quality, effectively improves the intensity of drill point, can be big The risk of some complicated plate broken needles in boring procedure of amplitude reduction, and can guarantee enough chip resistances and wearability.

Specifically, high intensity UC type drill point provided by the utility model, uses specific UC type single cutting tool structure, in master Gap is recessed between knife face and an auxiliary knife face, such design reduces the friction between chip and hole wall, can be very good to protect Demonstrate,prove wall quality；Set groove is length ditch, and structure is strong, the tapered structure in the middle section of drill point ontology, compared to common cylinder knot Structure is stronger, can substantially reduce the broken needle rate of boring procedure.

In addition, two steps or multi-step formula that drill point ontology back segment is rounded, the rotary table outer diameter being connected with shank Thus maximum can be such that the area of stainless steel shank and cemented carbide body in welding increases, on the one hand can effectively improve Flexural strength of the drill point in welding processing procedure, the decline of broken needle rate is also to have good front when on the other hand applying for drilling Effect.

Detailed description of the invention

The utility model is further illustrated below in conjunction with the drawings and specific embodiments.

Fig. 1 is the structural schematic diagram for the UC type drill point side that the example of the utility model provides；

Fig. 2 is the positive structural schematic diagram of UC type drill point that the example of the utility model provides；

Fig. 3 is the enlarged structure schematic diagram for the UC type drill point that the example of the utility model provides.

Specific embodiment

In order to be easy to understand the technical means, creative features, achievement of purpose, and effectiveness of the utility model, under Face combines and is specifically illustrating, and the utility model is further described.

Referring to Fig. 1, the structural schematic diagram of the UC type drill point provided in this shown example.As seen from the figure, this UC type drill point Mainly it is made of shank 11 and ontology 12 (also referred to as cutting portion) mutual cooperation.

Wherein, shank uses stainless steel, and ontology uses hard alloy, is brazed by high frequency and is welded on shank and ontology Together, thus, it is possible to realize while guaranteeing integral strength, cost of raw and processed materials is saved, reaches low-cost high-efficiency benefit,

Drill point ontology 12 in this example uses UC type structure, and whole includes the bit head 121 of front end, is located at bit head The ontology middle portion 181 of 121 rear end and ontology back segment portion 191.

The drill point ontology of such structure, whole outer diameter is 0.2-1.0mm, i.e., according to the difference of concrete position, outer diameter Change between 0.2-1.0mm.

The bit head 121 of ontology front end uses UC type structure, i.e. front end external diameter is larger, is formed as UC drill bit 121, in this way may be used The friction of drill point and hole wall is reduced, cutting heat is reduced, guarantees good wall quality.

On this basis, in order to increase the intensity of drill point, the apex point in the drill bit portion 121 uses single cutting tool form combination length The design of ditch.Referring to fig. 2 which shows this drill point knife face structural schematic diagram, as seen from the figure, entire knife face mainly include a master Knife face 13,3 auxiliary knife faces 14,15,16, apex face 13 have cutting edge 21 always, and two big auxiliary knife faces 14,16 are located at The two sides of apex face, the smallest auxiliary knife face 15 are located at the diagonal position of apex face, this 4 knife faces pass through certain tilt angle shape At apex point, drill point angle is 120-135 °, preferably 130 ° in this example.

On this basis, two big auxiliary knife faces 14 and 16 are opposite, and apex face 13 and auxiliary knife face 15 are opposite, to guarantee drill point Balance in boring procedure reaches good hole position accuracy.

Gap 151 is wherein recessed between apex face 13 and auxiliary knife face 14, this gap can also be reduced between drill point and hole wall Friction, reduce cutting heat.

The gap 151 is the little groove cut out by grinding wheel along drill point periphery, and the depth in the recessed gap is to bore The 1~40% of head diameter, gap length accounts for the 10%~30% of drill point body length.

For the gap 151 of the structure, to guarantee optimum efficiency, the depth in the recessed gap is preferably the 1 of bit diameter ~40%, can for 1%, 5%, 8%, 10%, 12%, 14%, 16%, 18%, 20%, 25%, 28%, 30%, 33%, 35%, 36%, 39%, 40%.

Further, it is short to also set up the long chip space 131 and one of two helical flutes one on drill point ontology 12 for this example Chip space 141, wherein be parallel to each other distribution between long chip space 131 and short chip space 141, and since apex point, hovers above brill In the middle portion 181 of needle ontology.

Here the spiral angle of two helical flutes is 15~50 °, and short chip space 141 accounts for long chip space 131 20%~90%.For the chip removal effect being optimal, here preferably 30% or 40% or 50% or 60%.

Furthermore the starting point of long chip space 131 connects simultaneously with apex face 13 and auxiliary knife face 16, chip can effectively be arranged Out, the starting point of short chip space 141 connects with 3 auxiliary knife faces 14,15,16 simultaneously, can keep the balance on drill point head, guarantees to bore Accurate positioning when needle drills.

Referring to Fig. 3, the middle portion 181 of the drill point ontology 12 in this example is whole in former cone structure, compared to common circle Rod structure is stronger, can substantially reduce the broken needle rate of boring procedure.

In order to cooperate the middle portion 181 of the original cone structure, ontology back segment portion 191 preferably uses circular two steps knot Structure, wherein the outer diameter of the first rotary table rank 161 is equal with the outer diameter of UC head 121, it is ensured that chip is smoothly discharged, while the second circle The outer diameter of step 171 is big compared with the first rotary table rank 161, thus increases the face of stainless steel shank and cemented carbide body in welding On the one hand product can effectively improve flexural strength of the drill point in welding processing procedure, broken needle when on the other hand applying for drilling The decline of rate is also to have good positive effect.

Thus the drill point constituted, intensity is high, and the wind of some complicated plate broken needles in boring procedure can be greatly lowered Danger, and can guarantee enough chip resistances and wearability.

Basic principles, main features, and advantages of the present invention has been shown and described above.Current row The technical staff of industry is described in above embodiments and description it should be appreciated that the present utility model is not limited to the above embodiments Only illustrate the principles of the present invention, on the premise of not departing from the spirit and scope of the utility model, the utility model is also It will have various changes and improvements, these various changes and improvements fall within the scope of the claimed invention.The utility model Claimed range is defined by the appending claims and its equivalent thereof.

Claims (5)

1. a kind of high intensity UC type drill point, including drill point ontology and shank, which is characterized in that drill point ontology front end is provided with Single apex face and three auxiliary knife faces constitute apex point, and the outer concave between the apex face and an auxiliary knife face is equipped with gap；The brill Also set up two helical flutes on needle ontology, described two helical flutes are an elongated slot and a short slot, elongated slot and short slot it Between be parallel to each other distribution, and since apex point, hover above on drill point ontology；The tapered structure in the middle section of the ontology, back segment are in Circular two step or multi-step formula.

2. high intensity UC type drill point according to claim 1, which is characterized in that the list apex face and three auxiliary knife faces, Apex face has cutting edge always, and three auxiliary knife faces include two big auxiliary knife face and one small auxiliary knife face, two big auxiliary knife face point Not Wei Yu apex face two sides, small auxiliary knife face is located at the diagonal position of apex face, and 4 knife faces are formed by certain tilt angle Apex point, drill point angle are 120-135 °.

3. high intensity UC type drill point according to claim 1, which is characterized in that the outer diameter of the drill point ontology is 0.2- 1.0mm, set spiral angle are 15~50 °, and short helicla flute accounts for the 20%~90% of long spire slot.

4. high intensity UC type drill point according to claim 1, which is characterized in that between the apex face and an auxiliary knife face The depth in the recessed gap in outside is the 1~40% of bit diameter, and gap length accounts for the 10%~30% of drill point body length.

5. high intensity UC type drill point according to claim 1, which is characterized in that the tapered knot in middle section of the drill point ontology Structure, the rotary table rank that cone cell ending rear end is connected is consistent with front end UC outer diameter of drill point ontology, the range of taper of cone structure It is 1 °~5 °.