CN103084630B - Hole making drill - Google Patents
Hole making drill Download PDFInfo
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- CN103084630B CN103084630B CN201310039836.8A CN201310039836A CN103084630B CN 103084630 B CN103084630 B CN 103084630B CN 201310039836 A CN201310039836 A CN 201310039836A CN 103084630 B CN103084630 B CN 103084630B
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- cutter tooth
- making drill
- hole making
- blade
- excircle
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Abstract
The invention discloses a kind of heels core of avoiding and fall into hole making drill in hole making drill, the circumferential side wall comprising bottom circular lid and vertically extend along excircle bottom lid, center bottom described lid is provided with connecting hole, described circumferential side wall is made up of at least two panels cutter tooth, all cutters tooth be distributed on circumferential side wall circumferentially and be separated with certain distance between adjacent two panels cutter tooth, formed circumferentially at all cutter tooth end faces, the excircle end of the blade of described cutter tooth is higher than inner periphery end.Because cutter tooth cut end is higher than inner periphery end at the excircle end of hole making drill, therefore when cutting, first material cuts off and causes the heels core under cutting to depart from raw material by excircle end, and now material not yet cuts off by inner periphery end, like this, the diameter of the heels core under cutting just is greater than the inner periphery diameter of hole making drill, and heels core is just blocked in cutter tooth cut end, just being more prone to when taking out heels core thus, improve operating efficiency.
Description
Technical field
The present invention relates to a kind of hole making drill.
Background technology
Hole making drill is also known as hole saw, and be divided into carbon steel hole saw, bimetal hole saw, carbide alloy (welding) hole saw and diamond hole saw, wherein using is bimetal hole saw the most widely.Different types of hole saw is used for the cutting of different materials, because the structural difference of hole saw in use causes the difference of production efficiency and machined material surface drilling quality.
Bi-metal opener is as utilization hole saw the most widely, and its teeth portion material is high-speed steel, and backing is chrome-vanadium steel, pass through heat-treatment quenching, teeth portion hardness can reach HRC63-68, and the flute profile of bi-metal opener is with milling or stamping forming, then forms cutting edge and chip area by point tooth.This hole making drill can drilling metal, non-ferrous metal, timber, plastics and various artificial material as laminate, MDF, veneer (wood shavings) plate, asbestos board etc., be widely used in building, maintenance and the industrial manufacturing market of part.Although bi-metal opener has operation strategies widely, in use but there is following problem:
1, Problems existing in Tapping procedures, because the chip space of bi-metal opener is little, see Fig. 5, multiple toothly to cut simultaneously, and during the material that particularly drilling is thicker, occur chip removal difficulty, cutting resistance is large, and cutting temperature is high, and stock-removing efficiency is lower, and tool life is low.Manufacturing process due to bi-metal opener first on sheet material, processes sawtooth, and then sheet material is rolled into circumferential side wall, and then circumferential side wall is welded on bottom lid, this processing technology just determines the concentricity of its teeth portion and positioning screw hole and teeth portion is beated relative poor, and the circularity difference of cylindrical is large.So this hole making drill easily occurs collapsing limit when cutting, tears, causes surface quality coarse in cut timber material surface, and bore size precision is not high.
2, the heels core after bi-metal opener boring takes out difficulty, during bi-metal opener boring, under center bit spirally-guided, heels core can fall in hole making drill, see Fig. 5, instrument must be adopted to take out before upper once boring, add labour intensity and the time waste of operating personnel, greatly reduce operating efficiency.For solving this difficult problem; usual meeting is a cover spring on hole making drill centre pilot bores; but the elasticity of spring is very large on cutting impact; heels core can not be ejected if the elastic force of spring is too little; if the elastic force of spring is comparatively large, along with the increase of drilling depth, resistance to cutting can strengthen; turn increase the thrust of operating personnel, labour intensity strengthens.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of heels core of avoiding and falls into hole making drill in hole making drill.
The present invention solves the hole making drill that its technical problem adopts, the circumferential side wall comprising bottom circular lid and vertically extend along excircle bottom lid, center bottom described lid is provided with connecting hole, described circumferential side wall is made up of at least two panels cutter tooth, all cutters tooth be distributed on circumferential side wall circumferentially and be separated with certain distance between adjacent two panels cutter tooth, formed circumferentially at all cutter tooth end faces, the excircle end of the blade of described cutter tooth is higher than inner periphery end.
Further, the inclination angle that the inside circumferential end of excircle end of the blade of described cutter tooth tilts and formed is end sword centripetal angle λ s, and described end sword centripetal angle λ s is 5 ~ 20 °.
Further, described cutter tooth is made up of with the blade forming blade position the cutter tooth body forming supporter, and described blade is welded on the top of described cutter tooth body.
Further, excircle coning angle b=1 ~ 5 ° of blade.
Further, inner periphery coning angle c=3 ~ 5 ° of blade.
Further, cutter tooth is provided with relief angle α
0, α
0it is 10 ° ~ 20 °.
Further, the anterior angle γ of described cutter tooth
0it is 0 ~ 20 °.
The invention has the beneficial effects as follows: due to the end sword centripetal angle λ s > 0 ° of cutter tooth cut end, namely cutter tooth cut end is higher than inner periphery end at the excircle end of hole making drill, therefore when cutting, first material cuts off and causes the heels core under cutting to depart from raw material by excircle end, and now material not yet cuts off by inner periphery end, like this, the diameter of the heels core under cutting just is greater than the inner periphery diameter of hole making drill, heels core is just blocked in cutter tooth cut end, but not enter into hole making drill inside, just be more prone to when taking out heels core thus, improve operating efficiency.Meanwhile, because cutter tooth is being circumferentially spaced apart, the interval between cutter tooth can effectively chip removal, and boring procedure chip removal is unimpeded, and cutting resistance is little, and durability is high.Cutter tooth is welded by cutter tooth body and blade, cutter tooth body is after benchmark carries out semifinishing with connecting hole, blade is welded on the front end of cutter tooth body circumference end face, then with bottom connecting hole and lid for benchmark carries out fine finishining to cutter tooth, ensure its geometric angle size and concentricity of beating.
Accompanying drawing explanation
Fig. 1 is the schematic diagram after the present invention installs;
Fig. 2 is the A place enlarged drawing of Fig. 1;
Fig. 3 is the present invention's schematic diagram in use;
Fig. 4 is the I place enlarged drawing of Fig. 3;
Fig. 5 is the hole making drill schematic diagram of prior art;
Parts, position and numbering in figure: bottom lid 1, circumferential side wall 2, cutter tooth body 3, blade 4, handle of a knife 5, drill bit 6, material 7, the centripetal angle λ of end sword
s, relief angle α
0, anterior angle γ
0.
Detailed description of the invention
Below in conjunction with accompanying drawing, the invention will be further described.
As shown in Figure 1, to the present invention includes bottom circular lid 1 and 1 excircle vertically extends bottom lid circumferential side wall 2, bottom described lid, the center of 1 is provided with connecting hole, described circumferential side wall 2 is made up of at least two panels cutter tooth, all cutters tooth be distributed on circumferential side wall 2 circumferentially and be separated with certain distance between adjacent two panels cutter tooth, formed circumferentially at all cutter tooth end faces, the excircle end of the blade of described cutter tooth is higher than inner periphery end.Cutter tooth cut end is blade, and the inclination angle that the excircle end of described blade and inner periphery end are formed because of difference in height is for hold the centripetal angle λ of sword
s, namely, the end sword centripetal angle λ s > 0 ° of cutter tooth cut end.As depicted in figs. 1 and 2, the centripetal angle λ of sword is held
sbe cutter tooth cut end along on hole making drill radial direction, angle of inclination downward-sloping from outside to inside, downwards namely bottom lid 1.Like this, formed circumferentially at cutter tooth, the excircle end of cutter tooth cut end end face is higher than inner periphery end.The excircle end of cutter tooth cut end end face and the difference in height of inner periphery end are by the centripetal angle λ of end sword
scontrol, the centripetal angle λ of end sword
slarger, then difference in height is larger.Connecting hole bottom lid on 1 is generally screwed hole, and namely handle of a knife 5 is arranged on connecting hole by screw thread, and drill bit 6 is then coaxially arranged in the installing hole of handle of a knife 5, assembles as shown in Figure 1 complete.In the working angles of reality, to cut sheet material 7, as shown in Figure 3, drive unit is utilized to rotate handle of a knife 5, this hole making drill and drill bit 6 is made together to rotate thus, first drill bit 6 to be drilled in sheet material 7 thus to lead for this hole making drill, because the excircle end of the cutter tooth cut end of this hole making drill is higher than inner periphery end, therefore first the excircle end of cutter tooth cut end cuts material 7, inner periphery end just starts to cut material 7 afterwards, be cut to the bottom surface of material 7 always, now first excircle end runs through whole material 7, this just makes the material 7 under cutting come off, the material 7 departed from is heels core, and now inner periphery end not yet runs through heels core and just completes cutting, its state as shown in Figure 4, heels core must some hang on cutter tooth cutting end, this part is between excircle end and inner periphery end, namely the maximum radius of heels core is greater than the internal diameter of this hole making drill, namely heels core can not enter into the inside of this hole making drill, like this, material 7 under cutting just can be removed easily, simultaneously, between cutter tooth, all there is certain spacing, utilize the space utilization instrument of this spacing just can pound out heels core easily, the chip removal when space that this spacing reserves also is beneficial to cutting very much, unimpeded in boring procedure chip removal, cutting resistance is little, durability is high.As figure 5 illustrates, heels core will inevitably enter into the inside of hole making drill in state diagram after prior art cutting, is easy to be stuck in inside and is difficult to take out.
For the ease of manufacturing and safeguarding, as shown in Figure 2, described cutter tooth is made up of with the blade 4 forming cut end the cutter tooth body 3 forming supporter, and described blade 4 is welded on the top of described cutter tooth body 3.Adding man-hour, 1 can be one-body molded bottom cutter tooth body 3 and lid, namely first process circular lid, and then process cutter tooth body 3 on the sidewall of lid, finally welding blade 4 on cutter tooth body 3 again.Bottom cutter tooth body 3 and lid, 1 adopts common structural steel, and blade 4 can carry out selected material according to the material that need cut.Reconditioning anterior angle again after the cutting edge passivation of blade 4, can reuse, and namely reaches repeatedly reconditioning and reuses, which reduces overall use cost.Because bottom cutter tooth body 3 and lid, 1 is one machine-shaping, therefore it has identical datum level man-hour adding, therefore bottom lid 1 connecting hole and cutter tooth body 3 formed circumferential concentric degree better, the circumference circularity that all cutter tooth bodies 3 are formed is higher, improve machining accuracy, boring surface polishing, nothing collapse limit, tear phenomenon generation.In this hole making drill running, after blade 4 cuts lower chip, chip just directly enters into the gap between cutter tooth, and then discharge from gap, the benefit of such setting is just to improve chip removal efficiency, because this reducing the accumulation of chip, decreasing cutting resistance, improve operating efficiency.
Concrete, excircle coning angle b=1 ~ 5 ° of blade 4.Inner periphery coning angle c=3 ~ 5 ° of blade 4.Now, blade 4 is large in top, the shape that bottom is little, in working angles, after top is cut and entered into material 7, the position below top, due to less and can not contact with material, so just decreases the frictional force that cutting produces, both can ensure the intensity of blade 4 by above angle design, frictional force is cut in minimizing that also can be good.
This hole making drill is recommended by following embodiment design:
1) optimal design of carbide alloy hole making drill cutter tooth geometric angle
The design is cut geometric angle design according to cutter tooth and is determined by a large amount of cutting experiment, the anterior angle (γ of cutter tooth
0) be 0 ~ 20 °, relief angle (α
0) be 10 ~ 20 °, the centripetal angle (λ of end sword
s) be 5 ~ 20 °.
The selection principle of a, cutter tooth geometric angle: select different cutter tooth geometric angles according to different cut timber material.Such as be processed with non-ferrous metal and aluminium alloy, wood-based plate, solid wood cutter tooth geometric angle selection see the following form:
| Cut timber material | Anterior angle (γ 0） | Relief angle (α 0） | Centripetal angle (the λ of end sword s） |
| Non-ferrous metal and aluminium alloy | 0° | 10° | 5° |
| Wood-based plate | 10° | 15° | 10° |
| Solid wood | 20° | 20° | 20° |
B, the centripetal angle (λ of end sword
s) fully can ensure that hole making drill heels core after cutting different materials can not fall in hole making drill, and only rest on hole making drill tooth top or come off.The manufacturing process of carbide alloy hole making drill determines the good concentricity of each teeth portion of hole making drill and screwed hole, and circularity is good, each tooth beating relative to screw.
2) structural design of carbide alloy hole making drill
A) specification limit (D) of hole making drill
Be φ 1 " (φ 25mm) is to φ 6 " (φ 152mm) according to the market application demand deisgn product specification limit of hole making drill.
B) the number of teeth weight range of hole making drill, also can think range of numbers of teeth
The design considers that the hole making drill of different size needs to possess close cutter tooth tooth pitch, and setting number of teeth weight range is 3 ~ 24.
C) the cutting-in scope (T) of hole making drill
For the material meeting different-thickness cuts, the hole making drill cutting-in that the design determines is 5/8 " (16mm) is to 4 " (100mm).
D) hole making drill with connect handle and be connected:
As shown in Figure 1, hole making drill with connect handle and adopt screw threads for fastening to be connected, connect handle and screw in hole making drill and compress hole making drill bottom to its end face.
E) manufacturing process of hole making drill:
The manufacture processing of hole making drill is all take screw as benchmark, and its diameter and the end centripetal angle of sword reach designing requirement by grinding method, thus the circularity of its diameter, to the concentricity of screw with beat and can reach higher precision.
3) product advantage analysis:
The bi-metal opener of the design's carbide alloy hole making drill and prior art contrasts:
A) carbide alloy hole making drill borehole accuracy significantly promotes, and boring surface polishing, nothing collapse limit, tear phenomenon generation.Drawn by the cutting experiment of two kinds of hole saws to φ 50.8, the bore dia that bi-metal opener processes is φ 50.8 ~ φ 52.8, and the diameter in the hole that carbide alloy hole making drill processes is φ 50.8 ~ φ 51.5.
B) boring procedure chip removal is unimpeded, and cutting resistance is little, and durability is high.With two kinds of hole making drills of specification of the same race, contrast cutting under normal usage and draw, the durability of carbide alloy hole making drill is 3 times of bi-metal opener.
C) penetration rate is fast, and operating efficiency is high.Draw with two kinds of hole making drill contrast cuttings of same specification, carbide alloy hole making drill penetration rate is more than 3 times of bi-metal opener.
4) cost structure
Although the value of Hardmetal materials is worth far above high speed steel material, the number of teeth of the design's carbide alloy hole making drill is less, and only a little more than bi-metal opener in the material and manufacturing cost of product, but its performance and life-span are far above bi-metal opener.Bi-metal opener can only single use, and the design's carbide alloy hole making drill repeatedly uses by reconditioning, and cost performance demonstrates clear superiority.
Claims (5)
1. hole making drill, comprise (1) bottom circular lid and (1) excircle vertically extends bottom lid circumferential side wall (2), bottom described lid, the center of (1) is provided with connecting hole, it is characterized in that: described circumferential side wall (2) is made up of at least two panels cutter tooth, all cutters tooth be distributed on circumferential side wall (2) circumferentially and be separated with certain distance between adjacent two panels cutter tooth, formed circumferentially at all cutter tooth end faces, the excircle end of the blade of described cutter tooth is higher than inner periphery end, the inclination angle that the inside circumferential end of excircle end of the blade of described cutter tooth tilts and formed is end sword centripetal angle λ s, described end sword centripetal angle λ s is 5 ~ 20 °, cutter tooth is provided with relief angle α
0, α
0it is 10 ° ~ 20 °.
2. hole making drill as claimed in claim 1, it is characterized in that: described cutter tooth is made up of the blade (4) of the cutter tooth body (3) and formation blade position that form supporter, and described blade (4) is welded on the top of described cutter tooth body (3).
3. hole making drill as claimed in claim 2, is characterized in that: excircle coning angle b=1 ~ 5 ° of blade (4).
4. hole making drill as claimed in claim 2, is characterized in that: inner periphery coning angle c=3 ~ 5 ° of blade (4).
5. the hole making drill as described in claim as arbitrary in Claims 1-4, is characterized in that: the anterior angle γ of described cutter tooth
0it is 0 ~ 20 °.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310039836.8A CN103084630B (en) | 2013-02-01 | 2013-02-01 | Hole making drill |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310039836.8A CN103084630B (en) | 2013-02-01 | 2013-02-01 | Hole making drill |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103084630A CN103084630A (en) | 2013-05-08 |
| CN103084630B true CN103084630B (en) | 2015-12-16 |
Family
ID=48198041
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310039836.8A Active CN103084630B (en) | 2013-02-01 | 2013-02-01 | Hole making drill |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103084630B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102886626A (en) * | 2011-07-18 | 2013-01-23 | 武汉钢铁建设环保工程有限责任公司 | Full-automatic welding machine for alloy blade and welding method for alloy blade |
| CN109482942A (en) * | 2019-01-14 | 2019-03-19 | 南通普瑞特机械有限公司 | Anti-blocking transition hole making drill |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101088686A (en) * | 2006-06-01 | 2007-12-19 | 珠海天威技术开发有限公司 | Cutter for machining ribbon ink roller |
| CN101116916A (en) * | 2007-08-20 | 2008-02-06 | 常州市万绥工具厂 | Annular drill |
| CN201091932Y (en) * | 2007-09-21 | 2008-07-30 | 天津二十冶建设有限公司 | Split bolt multi-layer sheet pad cutter |
| CN203184716U (en) * | 2013-02-01 | 2013-09-11 | 成都三锐工具制造有限公司 | Hole saw |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2631138A1 (en) * | 1976-07-10 | 1978-01-19 | Benz Gmbh Werkzeug Und Maschin | TOOL, IN PARTICULAR CORE HOLE DRILLING TOOL |
| JPH09103906A (en) * | 1995-10-04 | 1997-04-22 | Yunika Kk | Cylindrical hole boring tool |
| JP2000246526A (en) * | 1999-02-26 | 2000-09-12 | Fuji Heavy Ind Ltd | Hole saw |
| JP2009190136A (en) * | 2008-02-15 | 2009-08-27 | Miyanaga:Kk | Core drill |
| CN201799666U (en) * | 2010-09-22 | 2011-04-20 | 浙江荣达工具有限公司 | Hard alloy hole saw with long handle |
-
2013
- 2013-02-01 CN CN201310039836.8A patent/CN103084630B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101088686A (en) * | 2006-06-01 | 2007-12-19 | 珠海天威技术开发有限公司 | Cutter for machining ribbon ink roller |
| CN101116916A (en) * | 2007-08-20 | 2008-02-06 | 常州市万绥工具厂 | Annular drill |
| CN201091932Y (en) * | 2007-09-21 | 2008-07-30 | 天津二十冶建设有限公司 | Split bolt multi-layer sheet pad cutter |
| CN203184716U (en) * | 2013-02-01 | 2013-09-11 | 成都三锐工具制造有限公司 | Hole saw |
Also Published As
| Publication number | Publication date |
|---|---|
| CN103084630A (en) | 2013-05-08 |
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