CN206779532U - Fried dough twist drill bit - Google Patents

Abstract

The utility model provides a kind of fried dough twist drill bit, including twist drill rods, the top of twist drill rods includes main cutting edge and two front cutting edges, described two front cutting edges are located at the main cutting edge both sides respectively, the main cutting edge and two front cutting edges form tricuspid two-edged structure, axisymmetrical of described two front cutting edges along the twist drill rods is set, and identical difference in height be present between the top of the main cutting edge and the bottom of described two front cutting edges；The apex point of the symmetrical front cutting edge in the utility model both sides forms larger difference in height, middle apex point makes to reach dual centering during cutting with both sides apex point, aperture accuracy is set to be guaranteed, main cutting edge edge is ground symmetrically compared with short cutting edges, hole wall is smooth after cutting, efficiently avoid the generation of knife phenomenon.

Description

Fried dough twist drill bit

Technical field

Cutting tool field is the utility model is related to, more specifically, the utility model is related to a kind of fried dough twist drill bit.

Background technology

In the manufacturing process of aluminum alloy bodywork, end wall of car body surface needs substantial amounts of hand drill, to install windscreen. It is particularly important for the installation of guarantee nipple, drilling quality.Fluted drill is most widely used aperture knife tool, at present hair Existing, fluted drill is in the reaming procedure of the dynamic sleeping outside end wall of aluminium alloy, it is difficult to reaches the Ministry of Railways and accepter in factory to aluminium alloy Influence be present in the requirement for the roughness that car body hole proposes, the installation of new designs of threaded joints.

Hole surface roughness be difficult to the reason for up to standard be because drill bit vibration caused by, in order to overcome fried dough twist drill bit to shake Dynamic to cause hole surface roughness to be difficult to the problem of up to standard, prior art mainly uses fluted drill sharpening out step shape, although Step shape can play positioning action and alleviate roughness, but drill edge is asymmetric, still has vibrations to deposit in boring procedure Knife phenomenon is being had after the completion of drilling.

Utility model content

The utility model embodiment technical problem to be solved is that solve fluted drill hole present in aluminium alloy reaming Footpath low precision, hole surface roughness is not up to standard, and the problem of knife, the utility model provides a kind of reaming dynamic sleeping aluminium alloy car During external headwall, hole diameter precision is high, and surface roughness can reach the fried dough twist drill bit of requirement.

The utility model is achieved through the following technical solutions：A kind of fried dough twist drill bit, including twist drill rods, the fiber crops The top of flower drilling rod includes main cutting edge and two front cutting edges, and described two front cutting edges are located at the main cutting edge two respectively Side, the main cutting edge and two front cutting edges form tricuspid two-edged structures, and described two front cutting edges are along the twist drill rods Axisymmetrical set, exist between the top of the main cutting edge and the bottom of described two front cutting edges identical height Difference.

Further, the size of the difference in height is relevant with the size of the diameter of the twist drill rods.

Further, the size of the difference in height increases with the increase of the size of the diameter of the twist drill rods.

Further, the back angle of described two front cutting edges can adjust according to cutting situation during drilling.

Further, the size of the length of described two front cutting edges is relevant with the size of the diameter of the twist drill rods.

Further, the size of the length of described two front cutting edges with the size of the diameter of the twist drill rods increase And increase.

Further, the front cutting edge is to sharpen out structure.

Further, the front cutting edge and twist drill rods are formed in one structure.

The beneficial effect of the utility model embodiment is：By the way that fluted drill drill bit to be ground to the drill-shape of tricuspid, in Between apex point and both sides apex point grind the certralizing ability of appropriate difference in height enhancing drill bit, when reaming, middle part main cutting edge is first cut Cut, with feeding, symmetrical two front cutting edges enter cutting state, and cut out annular groove, start cutting when among cutting Sword is felt relieved, and secondly annular groove centering, makes drill bit not swing, centering effect is preferable；By main cutting edge edge, grind symmetrical Compared with short cutting edges, the intensity and wearability at enhancing main cutting edge edge, main cutting edge is not straight line, effectively avoids bundle Knife phenomenon.

Brief description of the drawings

, below will be to embodiment in order to illustrate more clearly of the utility model embodiment or technical scheme of the prior art Or the required accompanying drawing used is briefly described in description of the prior art, it should be apparent that, drawings in the following description are Some embodiments of the utility model, for those of ordinary skill in the art, on the premise of not paying creative work, Other accompanying drawings can also be obtained according to these accompanying drawings.

Fig. 1 is a kind of fluted drill drill bit structure schematic diagram that the embodiment of the utility model one provides；

Fig. 2 is the difference in height and front cutting edge length structure schematic diagram that the utility model embodiment provides.

Embodiment

It is new below in conjunction with this practicality to make the purpose, technical scheme and advantage of the utility model embodiment clearer Accompanying drawing in type embodiment, the technical scheme in the embodiment of the utility model is clearly and completely described, it is clear that is retouched The embodiment stated is the utility model part of the embodiment, rather than whole embodiments.Based on the implementation in the utility model Example, the every other embodiment that those of ordinary skill in the art are obtained under the premise of creative work is not made, is belonged to The scope of the utility model protection.

Research of the recent domestic to fluted drill is increasingly paid attention to, at this stage to fluted drill geometric parameter and the quality in hole Research with accuracy relation has obtained very big progress, including the improvement of drill bit form, the improvement of angle of drill bit and point bits Improvement of groove etc..But the improved method of reamer is carried out targetedly there is presently no the property according to aluminum alloy material Research.The main purpose of the utility model embodiment is that solution fluted drill aperture precision present in aluminium alloy reaming is poor, hole Surface roughness is not up to standard, and the problem of knife.Fig. 1 is a kind of fried dough twist drill bit knot that the embodiment of the utility model one provides Structure schematic diagram；Fig. 2 is the difference in height and front cutting edge length structure schematic diagram that the utility model embodiment provides.

Refer to shown in Fig. 1, Fig. 2, a kind of fried dough twist drill bit, including twist drill rods 1, the top bag of the twist drill rods 1 Main cutting edge 11 and two front cutting edges 12 are included, described two front cutting edges 12 are located at two sides of the main cutting edge 11 respectively Edge, the main cutting edge 11 and front cutting edge 12 form tricuspid two-edged structure, and described two front cutting edges 12 are along the fluted drill The axisymmetrical of bar 1 is set, and is existed between the top of the main cutting edge 11 and the bottom of described two front cutting edges 12 identical Height difference H.

Fried dough twist drill bit of the present utility model is the drill-shape of similar tricuspid, middle apex point 13 and monosymmetric apex point 14 have an identical height difference H, and the height difference H of monosymmetric apex point is to strengthen the certralizing ability of drill bit, when reaming, middle part Main cutting edge 11 is first cut, and with feeding, monosymmetric apex point 14 enters cutting state, and cuts out annular groove, and fluted drill bores Head starts have middle apex point 13 to feel relieved during cutting, and secondly annular groove centering, makes drill bit not swing, centering effect is preferable.

The size of the height difference H is relevant with the size of the diameter of the twist drill rods 1；The size of the height difference H with The increase of the size of the diameter of the twist drill rods 1 and increase.

The length L of described two front cutting edges 12 size is relevant with the size of the diameter of the twist drill rods 1；Described two The length L of individual front cutting edge 12 size increases with the increase of the size of the diameter of the twist drill rods 1.

Fluted drill of the present utility model need to only require when boring the hole of different pore size according to aperture, to the height difference H The length L of size and two front cutting edges 12 size, which is adjusted, can be achieved.

The size of the back angle of described two front cutting edges 12 has with the fried dough twist drill bit to the cutting situation of drilling Close, fluted drill of the present utility model judges cutting for two front cutting edges 12 in drilling according to the cutting actual conditions of drilling Cut whether relief angle meets condition, so as to realize that the back angle to two front cutting edges 12 carries out selective optimization.

The front cutting edge 12 is to sharpen out structure；Alternatively, front cutting edge 12 and twist drill rods 1 are formed in one knot Structure.

The utility model embodiment provides fried dough twist during a kind of sleeping aluminum alloy bodywork 13.1 hole of outside end wall dynamic applied to reaming Drill bit, after the completion of reaming, 13.1 holes reach Ra13.5 requirement, and the embodiment of the present embodiment is as follows：

Refer to shown in Fig. 1, Fig. 2, a kind of fried dough twist drill bit, including twist drill rods 1, the front end bag of the twist drill rods 1 A main cutting edge 11 and two front cutting edges 12 are included, described two front cutting edges 12 are located at the edge of the main cutting edge 11, The main cutting edge 11 and two front cutting edges 12 form tricuspid two-edged structure, and described two front cutting edges 12 are symmetrical structure, Height difference H (referring to shown in Fig. 2) be present with both sides front cutting edge 12 in the main cutting edge 11.Institute in the utility model embodiment The height difference H for stating main cutting edge 11 and both sides front cutting edge 12 be 2.5mm, and the reason for grinding 2.5mm differences in height is to strengthen drill bit Certralizing ability, when reaming, middle part main cutting edge 11 is first cut, and with feeding, monosymmetric apex point 14 enters cutting shape State, and cut out annular groove, there is middle apex point 13 to feel relieved during fluted drill bit cutting, secondly two front cutting edges 12 cut out annular groove Centering, makes drill bit not swing, centering effect is preferable.

Preferably, front cutting edge 12 described in the present embodiment is to grind structure, in other embodiments the front cutting edge 12 or with the integrated formed structure of drilling rod 1, fluted drill uses wear-resistant material.

The utility model, by the edge of main cutting edge 11, grind symmetrical shorter front cutting edge 12, the length L of front cutting edge 12 (referring to shown in Fig. 2) is 1mm, the intensity and wearability at such a structure enhancing main cutting edge 11 edge, and main cutting edge 11 is not Straight line, knife is effectively avoided, when the cutting of middle centering portion is basically completed, chipping allowance is remaining considerably less.

The back angle of front cutting edge 12 alternative optimization, adjusts it according to the actual conditions of cutting in the present embodiment Size, to reduce friction of the front cutting edge 12 below with processing bottom surface, ensure that cutting edge is sharp.

In the fried dough twist drill bit reaming procedure provided for the utility model embodiment, each working angles and existing fluted drill Cutting effect compared to there is following remarkable advantage：

1st, cut initial stage, the annular groove Dual positioning that middle apex point 13 is cut out with both sides apex point 14；

2nd, in working angles, have good positioning, cutting state it is good, hole wall is smooth；

3rd, cutting is near completion, and remaining cutting output is seldom；

4th, after the completion of cutting, hole wall is smooth, and roughness reaches requirement.

Three tip bit forms of the utility model fried dough twist drill bit, the middle apex point 14 symmetrical with both sides of apex point 13 form larger Difference in height, be different from the sharpening of standard Ni Zhifu drill, the middle part of drill bit is changed into based on centering based on the cutting of Ni Zhifu drill.It is middle Apex point 13 reaches the effect of dual centering with both sides apex point 14 in cutting, aperture accuracy is guaranteed.The utility model Symmetrical shorter pair being ground at the edge of main cutting edge 11 in embodiment and cutting sword 12, hole wall is smooth after making cutting, and can effectively avoid The generation of knife phenomenon.

When the utility model embodiment provides the dynamic sleeping aluminum alloy bodywork outside end wall of reaming a diameter of 13.1 hole, main cutting Sword 11 and the height difference H of both sides front cutting edge 12 are 2.5mm, and the length L of front cutting edge 12 is 1mm, certainly in the other different holes of reaming During the hole in footpath, main cutting edge 11 and the height difference H of both sides front cutting edge 12, the length L of front cutting edge 12 can be according to reaming pore sizes Concrete condition be adjusted.

It is protected using the aperture of the utility model embodiment reaming, aperture precision is within the scope of 0.03, the table in hole Surface roughness reaches requirement, and reduces the viscous knife phenomenon of drill bit in boring procedure, and reaming chip removal is smooth, drilling effect Rate lifts one times, also efficiently solves the knife phenomenon of reaming, can combine the utility model aluminum alloy material reamer Grinding method, customize drill bit.

Finally it should be noted that：Various embodiments above is only to illustrate the technical solution of the utility model, rather than it is limited System；Although the utility model is described in detail with reference to foregoing embodiments, one of ordinary skill in the art should Understand：It can still modify to the technical scheme described in foregoing embodiments, either to which part or whole Technical characteristic carries out equivalent substitution；And these modifications or replacement, the essence of appropriate technical solution is departed from this practicality newly The scope of each embodiment technical scheme of type.

Claims (8)

1. a kind of fried dough twist drill bit, including twist drill rods, it is characterised in that：The top of the twist drill rods include main cutting edge with Two front cutting edges, described two front cutting edges are located at the main cutting edge both sides respectively, and the main cutting edge and two pairs are cut Tooth shape is cut into tricuspid two-edged structure, axisymmetrical of described two front cutting edges along the twist drill rods is set, the main cutting Identical difference in height between the top of sword and the bottom of described two front cutting edges be present.

2. fried dough twist drill bit according to claim 1, it is characterised in that：The size of the difference in height and the twist drill rods Diameter size it is relevant.

3. fried dough twist drill bit according to claim 2, it is characterised in that：The size of the difference in height is with the twist drill rods Diameter size increase and increase.

4. fried dough twist drill bit according to claim 1, it is characterised in that：The size of the length of described two front cutting edges with The size of the diameter of the twist drill rods is relevant.

5. fried dough twist drill bit according to claim 4, it is characterised in that：The size of the length of described two front cutting edges with The increase of the size of the diameter of the twist drill rods and increase.

6. fried dough twist drill bit according to claim 1, it is characterised in that：The back angle of described two front cutting edges it is big It is small relevant to the cutting situation of drilling with the fried dough twist drill bit.

7. according to the fried dough twist drill bit described in claim 1-6 any one, it is characterised in that：The front cutting edge is to sharpen out Structure.

8. according to the fried dough twist drill bit described in claim 1-6 any one, it is characterised in that：Described two front cutting edges and fiber crops Flower drilling rod is formed in one structure.