CN107876840A - Circuit board drilling tool - Google Patents

Abstract

The present invention relates to a kind of circuit board drilling tool for the processing of PCB printed boards, body is bored including drill bit, three spiralling chip areas are provided with drill bit brill, long chip area is extended spirally to the end for boring body from the opening position of apex point, short chip area, which is arranged on, to be bored on body leading portion, short chip area and long chip area are different in not parallel but final intersecting setting due to spiral angle, towel back of the body chip area be arranged on long chip area and short chip area it is intersecting after towel back, both final short chip area and the towel back of the body chip areas are crossed by released state with long chip area, apex point is arranged to single main cutting edge；And chip area different in width, different spiral angles, reaching auxiliary drill bit stably carries out cutting operation, the purpose of quick discharge scrap, lifting drilling quality, ensure empty wall roughness, have rigidity preferably, hole position precision is higher, empty wall roughness energy meet demand, and the advantages of be not easy broken needle.

Description

Circuit board drilling tool

Technical field

The invention belongs to PCB microbit technical fields, are related to a kind of circuit twist drill for the processing of PCB printed boards Tool.

Background technology

In known technology, the finished product of PCB microbits is broadly divided into two kinds at present, one kind be conventional bit such as Fig. 1- Shown in Fig. 3, conventional bit is made up of brill body Fig. 1 and apex point Fig. 2 respectively, and it bores body as shown in figure 1, by cylinder Hardmetal materials It is processed into twisted shape（Helical form）Form, two symmetrical helical flute compositions, apex point 3a is as shown in Fig. 2 symmetrical by two Main cutting edge 1b, two helical secondary cuttings of the chisel edge between two main cutting edges and the rear side positioned at main cutting edge Sword is formed, and the first apex face 2b as depicted and the is form respectively between described main cutting edge and front cutting edge and chisel edge Two side face 3b, form own centre line 4b between the first apex face 2b and the second side face 3b, the length of center line is straight with boring body The length in footpath is substantially uniform, and spiral front cutting edge forms two symmetrical spiralling chip removals to the extension of Shenzhu face is bored Groove 1a, 2a, chip area 1a, 2a as shown in Figure 3 depth are uniformly distributed on brill Shenzhu face is increased, when carrying out grinding, Front cutting edge and the hole wall contact being ground out, form the strong point.

Now with the continuous development in market, bit diameter has the trend increasingly reduced, and diameter diminishes, and processes printed board Under equal conditions it is difficult to ensure that the rigidity of drill bit, rigidity cannot be guaranteed, just occur that processing printed board is bored to deviation, it is impossible to Meet market demands, diameter is mainly the drill bit below bradawl ￠ 0.50mm, has company of the same trade to carry out research and development improvement again at present Problem above, second of single cutting bit is released, bore body Fig. 4 mainly by former two symmetrical debris slot structures, become Being formed into a long spire chip area 2c and chip area 1c one short, apex point Fig. 5 withdrawing portion is formed by being linked to be multiple withdrawing faces, The first crest line 5c that two withdrawing faces are crossed to form is located at the front end of drill bit, the first crest line 5c relative to drill bit axle center O into Squarely it is in the rotating center section of drill bit, the second crest line 7c that first crest line 5c one end is crossed to form with two withdrawing faces It is connected, and second crest line 7c outer end is connected with main cutting edge 1c portions, the first crest line 5c other end direction and the second rib The opposite side of line 7c connecting sides, the apex point of this structure are made up of point, but by the first crest line shape with certain length Into, therefore the intensity increase of blade tip, can effectively suppress when be attached to be cut on material when easy caused chisel edge portion defect Or it is damaged, high processing hole position precision can be maintained, and can prevent from producing drill bit because the attaching to being cut material is unstable Fracture, and make processing printed board bore to without departing from, can thus improve the indeterminable problem of conventional bit, and Processing efficiency is lifted on the basis of the equal processing conditions of conventional bit, but the mainly towel that is hard up for money of this single cutting bit is carried on the back The contact area of 6c and hole wall is too big, because penetration rate is too fast, shown in Fig. 6, and a long spire chip area 8c and a short row It is too small to consider groove 9c waste discharges bits space to be worth doing so that the speed of waste discharge bits is too slow, in some requirement is higher, difficulty is higher printed boards Find that Hole Wall Roughness is very big, still can not meet use demand in use.3c is that side knife is wide in figure, and 4c is time chip discharge Groove, O are drill bit axle center.

The content of the invention

In order to solve the defects of prior art is present, a kind of rigidity of present invention offer is preferably, hole position precision is higher, empty wall is thick Rugosity energy meet demand, and it is not easy the circuit board drilling tool of broken needle.

The object of the present invention is achieved like this：Body is bored including forming integral drill bit with shank body, it is characterised in that：Boring Head is provided with three spiralling chip areas with boring, wherein first is long chip area, opening position of the long chip area from apex point The end for boring body is extended spirally, Article 2 is short chip area, and short chip area, which is arranged on, to be bored on body leading portion, short chip area and long row Bits groove is because spiral angle is different in not parallel but final intersecting setting, and Article 3 is that towel carries on the back chip area, and towel back of the body chip area is set Towel back after long chip area and short chip area are intersecting, also on body leading portion is bored, final short chip area and the towel back of the body chip area two Person is crossed by released state with long chip area, and apex point is arranged to single main cutting edge；And chip area different in width, different helical angles Degree, reach auxiliary drill bit and stably carry out cutting operation, the purpose of quick discharge scrap, lifting drilling quality, ensure that empty wall is coarse Degree.

Described short chip area is set bores body leading portion positioned at drill bit, is a short chip removal with the symmetrical 180 degree of long chip area Groove, the angle of helical angle is identical with long chip area, and short chip area is crossed by released state with long chip area；The length of short chip area The 15%-25% of the length of long chip area is accounted for, short chip area, which is dissolved into long chip area, ensures drilling hole position precision, and helical angle Augmenting portion gradually becomes shallower as groove depth so that the groove width of the long chip area and short chip area of intersection is wider, beneficial to chip removal, with depth Degree shoals to make up the rigidity loss that groove width is brought, and can flexibly use.

It is described be arranged on long chip area and the second short chip area it is intersecting after towel back, also boring the leading portion of body, be arranged on Towel back after long chip area and the second short chip area are intersecting, also boring the leading portion of body, the towel back of the body both chip area and short chip area Crossed by released state with long chip area, and two towel hem width degree are equal, and the length of towel back of the body chip area accounts for long chip removal flute length 35%-55%, ensure to add chip space on the basis of the rigidity of short chip area is good, it is practical slightly to be required in drilling device to hole Higher sheet material, and because the time of drilling is shorter, solid capacity is inherently smaller, therefore towel back of the body chip area can make up in the past The defects of rigidity is well but empty wall roughness does not reach requirement.

The apex point includes a main cutting edge, an apex face, a side face, two towel sides, a line knife, operator Face is crossed to form the first crest line with side face, and the first crest line is in the pivot of drill bit with respect to the axle center O of drill bit at a right angle Portion, the second crest line that one end of the first crest line is crossed to form with two withdrawing faces；Using axle center O as origin, two towel sides and one Side knife forms a triangle point, and boring positioning can be carried out exactly in drilling, and coordinates main cutting edge to be cut, and makes The hole position precision that must be drilled out is higher, carries on the back chip area by long chip area, the second short chip area, the 3rd towel and rapidly arranges scrap Go out, two towel sides are cut borehole wall sharp, it is ensured that good Hole Wall Roughness.

According to the finished product of the miniature single cutting bits of PCB made of above-mentioned technique and processing method, can be achieved because diameter diminishes, Drill bit rigidly cannot be guaranteed that under equal conditions appearance processing printed board bores the phenomenon to deviation, and on former basis The upper life-span can be lifted, and the Hole Wall Roughness for the printed board that all requirements are higher, difficulty is higher can reach, and need not The processing conditions and environment of client end alteration, client use this single cutting bit also without other new equipment are bought, Cost will not also be increased in technique, equipment, staff training so as to reduce the cost of processing, improve production efficiency.With existing skill Art single cutting bit contrasts, and there is about 3 times of raising in the life-span of single cutting bit of the present invention.With the increase that hole limits, with prior art Single cutting bit is compared, and single cutting bit has than the retentivity of hole position and significantly improved.

Brief description of the drawings

Fig. 1 is the brill body structure schematic plan view of conventional bit；

Fig. 2 is conventional bit apex point structural representation plan；

Fig. 3 is that conventional bit bores body cross-sectional view；

Fig. 4 is that the single cutting bit in known technology bores body structure schematic diagram；

Fig. 5 is the single cutting bit apex point structural representation in known technology；

Fig. 6 is that the single cutting bit in known technology bores body cross-sectional view；

Fig. 7 is that single cutting bit of the present invention bores body structure schematic diagram；

Fig. 8 is that the second short chip area of single cutting bit and Article 3 towel of the present invention back of the body chip area cross schematic diagram；

Fig. 9 is single cutting bit apex point cross-sectional view of the present invention；

Figure 10 is along the profile of Section A-A in Fig. 8；

Figure 11 is along the profile of section B-B in Fig. 8；

Figure 12 is along the profile in C-C sections in Fig. 8；

Figure 13 is single cutting bit of the present invention and prior art single cutting bit contrast lifetime change figure；

Figure 14 is single cutting bit of the present invention and prior art single cutting bit hole position CPK with hole position changing trend diagram；

Figure 15 is single cutting bit of the present invention and prior art single cutting bit Hole Wall Roughness contrast test datagram.

Single cutting bit accompanying drawing mark explanation of the present invention：1：Towel carries on the back chip area；2：Long chip area；3：Bore body leading portion；4：Short chip removal Groove；a：Helical angle；5：Apex face；6：Side face；7：Second crest line；8：Main cutting edge；9：Side knife；10：First crest line；11：Towel Side；O:Drill bit axle center.

Embodiment

Referring to Fig. 1-Fig. 3, the conventional bit is made up of brill body Fig. 1 and apex point Fig. 2 respectively, and it bores body as shown in figure 1, by justifying Post Hardmetal materials are processed into twisted shape（Helical form）Form, two symmetrical helical flute compositions, apex point 3a such as Fig. 2 institutes Show, by two symmetrical main cutting edge 1b, chisel edge between two main cutting edges and two of rear side positioned at main cutting edge are in Spiral front cutting edge composition.As depicted is form respectively between described main cutting edge and front cutting edge and chisel edge One apex face 2b and the second side face 3b, own centre line 4b, center line are formed between the first apex face 2b and the second side face 3b Length and bore body diameter length it is substantially uniform, spiral front cutting edge to the extension of Shenzhu face is bored, formed two it is symmetrical Spiralling chip area 1a, 2a, chip area 1a, 2a as shown in Figure 3 depth are uniformly distributed on brill Shenzhu face is increased, entered During row grinding, front cutting edge and the hole wall contact being ground out, the strong point is formed.

Referring to Fig. 4-Fig. 6, prior art single cutting bit, body Fig. 4 is bored mainly by two former symmetrical debris Slot structure, become a long spire chip area 2c and chip area 1c one short compositions, apex point Fig. 5 withdrawing portion is by being linked to be multiple move back Knife face is formed, and the first crest line 5c that two withdrawing faces are crossed to form is located at the front end of drill bit, and first crest line 5c is with respect to drill bit Axle center O be in the rotating center section of drill bit at a right angle, what first crest line 5c one end was crossed to form with two withdrawing faces Second crest line 7c is connected, and second crest line 7c outer end is connected with main cutting edge 1c portions, the first crest line 5c other end court To the opposite side with the second crest line 7c connecting sides, the apex point of this structure is made up of point, but by with certain length First crest line formed, therefore blade tip intensity increase, can effectively suppress when be attached to be cut on material when it is easily caused Chisel edge portion defect or breakage, high processing hole position precision can be maintained, and can prevented because the attaching to being cut material is unstable And broken drill is produced, and processing printed board is bored to without departing from can thus improve can not solving for conventional bit The problem of, and processing efficiency is lifted on the basis of the equal processing conditions of conventional bit, but this single cutting bit is scarce Money be mainly towel the back of the body 6c and hole wall contact area it is too big, because penetration rate is too fast, shown in Fig. 6, a long spire chip area 8c and one short chip area 9c waste discharges bits space is too small so that the speed of waste discharge bits is too slow, and at some, requirement is higher, difficulty is higher Printed board use in find Hole Wall Roughness it is very big, still can not meet use demand.3c is that side knife is wide in figure, 4c For secondary chip discharging grooves, O is drill bit axle center.

Referring to Fig. 7-Figure 12, a kind of circuit board drilling tool, including form integral drill bit with shank body and bore body, it is characterised in that： Three spiralling chip areas are provided with drill bit brill, wherein first is long chip area 2, long chip area 2 is from apex point Opening position extends spirally the end for boring body, and Article 2 is short chip area 4, and short chip area 4, which is arranged on, to be bored on body leading portion 3, short row Consider to be worth doing groove 4 and long chip area 2 due to spiral angle it is different in it is not parallel but it is final it is intersecting set, Article 3 is that towel carries on the back chip area 1, towel Back of the body chip area 1 is arranged on the towel back after long chip area 2 and short chip area 4 intersect, also on body leading portion 3 is bored, final short chip removal Both groove 4 and towel back of the body chip area 1 are crossed by released state with long chip area 2, and apex point is arranged to single main cutting edge 8.

Described short chip area 4 is set bores body leading portion positioned at drill bit, is a short row with long 2 symmetrical 180 degree of chip area Consider groove to be worth doing, helical angle a angle is identical with long chip area, and short chip area is crossed by released state with long chip area；Short chip area 4 Length accounts for the 15%-25% of the length of long chip area 2, and short chip area 4, which is dissolved into long chip area 2, ensures drilling hole position precision, and And helical angle a augmenting portions gradually become shallower as groove depth so that the groove width of the long chip area of intersection and short chip area 4 is wider, profit In chip removal, lost with depth shallower to make up the rigidity that groove width is brought.

The towel carries on the back two towel hem widths after both chip area 1 and short chip area 4 are crossed by released state with long chip area Spend equal, the length of towel back of the body chip area 1 accounts for the 35%-55% of long chip removal flute length, ensures on the basis of the rigidity of short chip area 4 is good Add chip space.

The apex point includes main cutting edge 8, one apex face 5, one side face 6, two towel sides 11, an a line knives 9, apex face 5 is crossed to form the first crest line 10 with side face 6, and the axle center O of 10 relative drill bit of the first crest line is at a right angle in brill The rotating center section of head, the second crest line 7 that one end of the first crest line 10 is crossed to form with two withdrawing faces；Using axle center O as origin, Two towel sides 11 and a line knife 9 form a triangle point, can carry out boring positioning exactly in drilling, and coordinate master Cutting edge is cut so that the hole position precision drilled out is higher, and chip removal is carried on the back by long chip area, the second short chip area, the 3rd towel Groove rapidly discharges scrap, and two towel sides are cut borehole wall sharp, it is ensured that good Hole Wall Roughness.

The chip area structure-improved that the structure of this invention single cutting bit is shown in Fig. 7-Figure 12, bore body and be provided with three spirals The chip area risen, set wherein a long chip area is extended spirally to the end for boring body, the second short chip area from the opening position of apex point To put and boring the leading portion of body, short chip area and long chip area are in not parallel but finally intersecting setting because spiral angle is different, the Three towel back of the body chip area be arranged on long chip area and the second short chip area it is intersecting after towel back, also boring the leading portion of body, final the Both the short groove of two chip removals and towel back of the body chip area are crossed by released state with long chip area, and apex point is arranged to single main cutting edge, and Chip area different in width, different spiral angles, reach auxiliary drill bit and stably carry out cutting operation, the purpose of quick discharge scrap, Lifting drilling quality, ensures empty wall roughness.

Referring to Figure 13,14,15, it can be seen that the single cutting bit of this invention is in microbit of the diameter less than 0.50mm Hole position precision, life-span, Hole Wall Roughness all meet customer requirement, and have and significantly lifted.

Claims (4)

1. a kind of circuit board drilling tool, including form integral drill bit with shank body and bore body, it is characterised in that：It is provided with drill bit brill Three spiralling chip areas, wherein first is long chip area（2）, long chip area（2）Prolong from the opening position spiral of apex point The end for boring body is reached, Article 2 is short chip area（4）, short chip area（4）It is arranged on and bores body leading portion（3）On, short chip area（4） With long chip area（2）It is in not parallel but final intersecting setting because spiral angle is different, Article 3 is towel back of the body chip area（1）, towel Carry on the back chip area（1）It is arranged on long chip area（2）With short chip area（4）Towel back after intersecting, also boring body leading portion（3）On, most Short chip area eventually（4）Chip area is carried on the back with towel（1）Both are by released state with long chip area（2）Cross, apex point is arranged to single master Cutting edge（8）.

2. circuit board drilling tool according to claim 1, it is characterised in that：Described short chip area（4）Setting is located at drill bit Body leading portion is bored, is one and long chip area（2）The short chip area of symmetrical 180 degree, helical angle（a）Angle and long chip area phase Together, short chip area is crossed by released state with long chip area；Short chip area（4）Length account for long chip area（2）Length 15%-25%, short chip area（4）It is dissolved into long chip area（2）It is middle to ensure drilling hole position precision, and helical angle（a）Augmenting portion Gradually become shallower as groove depth so that the long chip area of intersection and short chip area（4）Groove width it is wider, beneficial to chip removal, become with depth The shallow rigidity brought to make up groove width is lost.

3. circuit board drilling tool according to claim 1, it is characterised in that：The towel carries on the back chip area（1）With short chip area （4）Two towel hem width degree after both are crossed by released state with long chip area are equal, towel back of the body chip area（1）Length account for long row Consider the 35%-55% of flute length to be worth doing, ensure in short chip area（4）Rigidity it is good on the basis of add chip space.

4. circuit board drilling tool according to claim 1, it is characterised in that：The apex point includes a main cutting edge（8）, one Individual apex face（14）, a side face（12）, two towel sides（11）, a line knife（9）, apex face（14）With side face（12）Phase Hand over and form the first crest line（10）, the first crest line（10）Axle center O with respect to drill bit is in the rotating center section of drill bit at a right angle, the One crest line（10）The second crest line for being crossed to form of one end and two withdrawing faces（13）；With axle center（O）For origin, two towel sides （11）With a line knife（9）A triangle point is formed, boring positioning can be carried out exactly in drilling, and coordinate main cutting Sword is cut so that the hole position precision drilled out is higher, fast by long chip area, the second short chip area, the 3rd towel back of the body chip area Speed discharges scrap, and two towel sides are cut borehole wall sharp, it is ensured that good Hole Wall Roughness.