CN104439538A - Machining method for multi-start worm - Google Patents
Machining method for multi-start worm Download PDFInfo
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- CN104439538A CN104439538A CN201410569108.2A CN201410569108A CN104439538A CN 104439538 A CN104439538 A CN 104439538A CN 201410569108 A CN201410569108 A CN 201410569108A CN 104439538 A CN104439538 A CN 104439538A
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- feed
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Abstract
The invention discloses a machining method for a multi-start worm. According to the method, at least two rows of milling cutters are fixed to a rotating shaft of the same cutter rest to form a plurality of rows of milling cutters, the cutter rest drives the milling cutters to rotate while carrying out parallel feeding along an axis of a round-rod-shaped worm blank clamped on a main shaft, and due to the fact that the milling cutters are used for machining the multi-start worm, the number of times of feeding of the milling cutters and the number of times of tooth separating are reduced, and the machining efficiency of the multi-start worm is improved. The number of times of cutter feeding and the number of times of tooth separating can be reduced in the machining process of the multi-start worm through the milling cutters, and the machining efficiency of the multi-start worm is improved. The larger the number of starts of the multi-start worm is, the more obvious the efficiency of machining through the milling cutters is.
Description
Technical field
the present invention relates to a kind of processing method of multistart worm, belong to worm screw processing technique field.
Background technology
the method of prior art processing multistart worm, normally adopts single milling cutter to process.Process is: be clipped on the main shaft of milling machine by round bar shape worm screw blank to be processed, round bar shape worm screw blank axial restraint, and the circumgyration campaign around axis only done by round bar shape worm screw blank under the drive of main shaft; By in the rotating shaft of single milling cutter immovable support, milling cutter rotates, and an edge round bar shape blank moves axially feeding; On round bar shape worm screw blank, the helical tooth of the first head is processed by milling cutter.By gear device after withdrawing, milling cutter is rotated 360/Z degree, wherein Z is the head number of helical tooth on multistart worm; And then carry out second time feed, round bar shape worm screw blank processes the helical tooth of the second head.Repeat said process, until process the helical tooth of predetermined headers number Z on round bar shape worm screw blank.
existing processing method often completes the processing of a head helical tooth, once divides tooth to operate with regard to needs, and then feed, until complete multiple-threaded processing on worm screw, existing method efficiency is too low.
Summary of the invention
the object of the invention is to, provide a kind of processing method of multistart worm, method of the present invention adopts many gang millings cutter to complete the processing of multistart worm, to reduce point tooth and feed number of times raising working (machining) efficiency.
technical scheme of the present invention:
a kind of processing method of multistart worm, the method be at least two gang milling cuttves are fixed on same knife rest rotating shaft on form many gang millings cutter, many gang millings cutter is driven while rotation one edge is clipped in the round bar shape worm screw blank axis being parallel feed on main shaft by knife rest, by many gang millings cutter, multistart worm is processed, to reduce feed number of times and point tooth number of times of milling cutter, improve the working (machining) efficiency of multistart worm.
in the processing method of aforementioned multistart worm, the space width P of described many gang millings cutter
0
equal the tooth pitch between adjoining spiral tooth on multistart worm, the profile angle α of many gang millings cutter equals the profile angle of helical tooth on multistart worm.
in the processing method of aforementioned multistart worm, described knife rest drives many gang millings cutter often to rotate a circle, and many gang millings cutter is along the tooth pitch P of a round bar shape worm screw blank axis being parallel feed single thread tooth.
in the processing method of aforementioned multistart worm, the row N of described many gang millings cutter is more than or equal to the head number Z of multistart worm, or the row N of many gang millings cutter is less than the head number Z of multistart worm; As N>=Z, completed the processing of Z head worm screw by a feed; As N < Z, complete the processing of Z head worm screw by being less than Z feed.
in the processing method of aforementioned multistart worm, during described N < Z, after completing first time feed, then carry out second time feed again after by gear device N gang milling cutter being rotated 360/Z degree, repeat point tooth and feed process until feed completes the processing of the whole helical tooth of Z head worm screw for Z time.
in the processing method of aforementioned multistart worm, described N < Z, and Z/N is when having a remainder, the basis of quotient increases a feed process, during feed, the bull milling cutter vertically front toothrow of direction of feed participates in cutting, and the empty feed in the in type teeth groove of workpiece of all the other teeth does not participate in cutting.
in the processing method of aforementioned multistart worm, the direction that described gear device rotates at every turn is identical, keeps the direction of milling cutter movement vertically identical in direction of feed motion.
compared with prior art, the present invention adopts many gang millings cutter can reduce feed and point tooth number of times in multistart worm process, thus improves the working (machining) efficiency of multistart worm.The head number of multistart worm is more, and the efficiency adopting many gang millings cutter to process is more obvious.
Accompanying drawing explanation
fig. 1 is method schematic diagram of the present invention;
fig. 2 is the machining sketch chart of prior art;
fig. 3 is the triple start worm schematic diagram processed;
fig. 4 is the A direction view of Fig. 3.
the single milling cutter of being labeled as in accompanying drawing: 1-, 2-round bar shape worm screw blank, 3-helicla flute, the double milling cutter of 4-, 5-is arranged on the rotating shaft of knife rest.
Detailed description of the invention
below in conjunction with drawings and Examples, the present invention is described in further detail, but not as any limitation of the invention.
a kind of processing method of multistart worm, as shown in Figure 1, the method be at least two gang milling cuttves are fixed on same knife rest rotating shaft on form many gang millings cutter, many gang millings cutter is driven while rotation one edge is clipped in the round bar shape worm screw blank axis being parallel feed on main shaft by knife rest, by many gang millings cutter, multistart worm is processed, to reduce feed number of times and point tooth number of times of milling cutter, improve the working (machining) efficiency of multistart worm.The space width P of many gang millings cutter
0
equal the tooth pitch between adjoining spiral tooth on multistart worm, the profile angle α of many gang millings cutter equals the profile angle of helical tooth on multistart worm.Knife rest drives many gang millings cutter often to rotate a circle, and many gang millings cutter is along the tooth pitch P of a round bar shape worm screw blank axis being parallel feed single thread tooth.The row N of many gang millings cutter is more than or equal to the head number Z of multistart worm, or the row N of many gang millings cutter is less than the head number Z of multistart worm; As N >=Z, completed the processing of Z head worm screw by a feed; As N < Z, complete the processing of Z head worm screw by being less than Z feed.During N < Z, after completing first time feed, after then by gear device N gang milling cutter being rotated 360/Z degree, carry out second time feed again, repeat point tooth and feed process until feed completes the processing of the whole helical tooth of Z head worm screw for Z time.N < Z, and when Z/N has a remainder, the basis of quotient increases a feed process, during feed, the bull milling cutter vertically front toothrow of direction of feed participates in cutting, and the empty feed in the in type teeth groove of workpiece of all the other teeth does not participate in cutting.The direction that gear device rotates at every turn is identical, keeps the direction of milling cutter movement vertically identical in direction of feed motion.
process of the present invention and principle
same row's cutter tooth of many gang millings cutter in circumferencial direction annular array, in axial direction parallel distribution between row and row, and tooth pitch P between row and row
0
equal the normal pitch on multistart worm, the profile angle α of milling cutter equals multistart worm normal profile angle.On screw-thread miller during machining worm, round bar shape worm screw blank axial restraint, only do the circumgyration campaign around axis, move axially along round bar shape worm screw blank while milling cutter rotates and do feed motion, round bar shape worm screw blank circumferencial direction rotates one turn, and milling cutter accurately moves the tooth pitch length P of a helical tooth vertically.Milling cutter is axial feed once, and round bar shape worm screw blank can process the teeth groove number equal with milling cutter row N.No matter be single cutter or arrange cutter more, equipment adjustment change gear calculates all using workpiece helical pitch as foundation.
the row of milling cutter is N, and the head number of multistart worm is Z.
following relation is had between the row N of milling cutter and the head number Z of multistart worm:
Z/N=a……b
wherein a is the integer part of the business of Z/N gained;
b is the complementing part after Z/N gained business.
1, as Z≤N, i.e. a≤1.Namely workpiece head number Z is less than or equal to milling cutter row N, now, in process, only need milling cutter once axial feed can process the complete profile of tooth of workpiece.When workpiece head number Z is equal with milling cutter row N, the helicla flute of a head on the lucky corresponding multistart worm of milling cutter one toothrow, when multistart worm head number Z is less than milling cutter row N, the milling cutter vertically front Z toothrow of direction of feed participates in cutting, and all the other teeth will empty feed not participate in cutting in the in type teeth groove of workpiece.
2, when Z can be divided exactly by N, then remainder b=0.Number of threads Z is the integral multiple of milling cutter row N.Milling cutter can process complete workpiece profile of tooth through a axial feed.From the 2nd feed, need at every turn rotate gear device the number of degrees for (360 °/a), realize milling cutter and move axially each workpiece axial pitch of N along workpiece.The direction that gear device rotates at every turn is identical, keeps the direction of milling cutter movement vertically identical in direction of feed motion.
3, when Z can not be divided exactly by N, i.e. remainder b ≠ 0.Processing one integral piece workpiece time, the number of times of milling cutter feed adds up as (a+1) is secondary, in the feed of first a time, from the 2nd feed, need at every turn rotate gear device the number of degrees be (360 °/a), realize milling cutter along workpiece and move axially N number of workpiece axial pitch; During last 1 feed, the number of degrees rotating gear device are b/Z × 360 °, and milling cutter moves axially b workpiece axial pitch along workpiece.The direction that gear device rotates at every turn is identical, keeps the direction of milling cutter movement vertically identical in direction of feed motion.
embodiment 1
this example is improvements over the prior art, is processed as example below with 3 worm screws.Fig. 2 is the method schematic diagram that 3 worm screws processed by the single milling cutter of prior art.As seen from Figure 1, the feed of single milling cutter 1 once can only process the helicla flute 3 that a tooth pitch is P on round bar shape worm screw blank 2.After processing Article 1 helicla flute, original position return by single milling cutter, by gear device, single milling cutter rotated 120 degree, then carries out second time feed, round bar shape worm screw blank processes Article 2 helicla flute.Repeat said process, then complete Article 3 helicla flute on round bar shape worm screw blank.Thus complete the processing of whole 3 worm screws.Process 3 worm screws in prior art and need feed three times, twice, point tooth.
this is such as shown in Fig. 1, round bar shape worm screw blank 2 in figure is fixed on the main shaft of milling machine, round bar shape worm screw blank 2 is driven to rotate by arrow B direction in figure by main shaft, then double milling cutter 4 is arranged in the rotating shaft 5 of knife rest, two gang milling cuttves 4 under the drive of rotating shaft 5 while rotate shown in arrow C in as figure, while as shown in arrow D in figure, along the axial direction parallel feed of round bar shape worm screw blank 2, on round bar shape worm screw blank 2, cut two helicla flutes 3 on 3 worm screws by double milling cutter 4.After processing two helicla flutes 3, double milling cutter 4 is backed to square one, by gear device, double milling cutter 4 is rotated 120 degree, and then feed once, complete the processing of Article 3 helicla flute 3.This example processing 3 worm screws need feed twice, and point tooth once.Fewer than a prior art feed and a point tooth.Improve working (machining) efficiency.Only need a feed according to three gang milling cutter processing in this example, do not need a point tooth, working (machining) efficiency is higher.
the principle of this example is as follows: number of threads Z=3, milling head number N=2.Apply mechanically above-mentioned formula Z/N=3/2, Z to be divided exactly by N, business a is 1, and remainder b is 1.The number of times of milling cutter feed adds up as a+b=1+1=2 time, and the 1st feed can complete the Milling Process of worm screw first and worm screw second, now also remains worm screw the 3rd and not yet processes, need last 1 feed supplementary processing.When carrying out second time feed, rotate b/Z × 360 °=120 ° by gear device, namely milling cutter moves axially (b=1) individual worm screw axial pitch.When second time feed, front toothrow participates in cutting, and all the other teeth will empty feed not participate in cutting in the in type teeth groove of workpiece.
Claims (7)
1. the processing method of a multistart worm, it is characterized in that: the method be at least two gang milling cuttves are fixed on same knife rest rotating shaft on form many gang millings cutter, many gang millings cutter is driven while rotation one edge is clipped in the round bar shape worm screw blank axis being parallel feed on main shaft by knife rest, by many gang millings cutter, multistart worm is processed, to reduce feed number of times and point tooth number of times of milling cutter, improve the working (machining) efficiency of multistart worm.
2. the processing method of multistart worm according to claim 1, is characterized in that: the space width P of described many gang millings cutter
0equal the tooth pitch between adjoining spiral tooth on multistart worm, the profile angle α of many gang millings cutter equals the profile angle of helical tooth on multistart worm.
3. the processing method of multistart worm according to claim 2, it is characterized in that: described knife rest drives many gang millings cutter often to rotate a circle, many gang millings cutter is along the tooth pitch P of a round bar shape worm screw blank axis being parallel feed single thread tooth.
4. the processing method of multistart worm according to claim 3, is characterized in that: the row N of described many gang millings cutter is more than or equal to the head number Z of multistart worm, or the row N of many gang millings cutter is less than the head number Z of multistart worm; As N >=Z, completed the processing of Z head worm screw by a feed; As N < Z, complete the processing of Z head worm screw by being less than Z feed.
5. the processing method of multistart worm according to claim 4, it is characterized in that: during described N < Z, after completing first time feed, then carry out second time feed again after by gear device N gang milling cutter being rotated 360/Z degree, repeat point tooth and feed process until feed completes the processing of the whole helical tooth of Z head worm screw for Z time.
6. the processing method of multistart worm according to claim 5, it is characterized in that: described N < Z, and Z/N is when having a remainder, the basis of quotient increases a feed process, during feed, the bull milling cutter vertically front toothrow of direction of feed participates in cutting, and the empty feed in the in type teeth groove of workpiece of all the other teeth does not participate in cutting.
7. the processing method of multistart worm according to claim 6, is characterized in that: the direction that described gear device rotates at every turn is identical, keeps the direction of milling cutter movement vertically identical in direction of feed motion.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410569108.2A CN104439538A (en) | 2014-10-23 | 2014-10-23 | Machining method for multi-start worm |
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| CN201410569108.2A CN104439538A (en) | 2014-10-23 | 2014-10-23 | Machining method for multi-start worm |
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| CN104439538A true CN104439538A (en) | 2015-03-25 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20020067966A1 (en) * | 2000-12-01 | 2002-06-06 | Yaxiong Zhang | Method of forming milled tooth of variable tooth worm |
| JP2003231021A (en) * | 2002-02-12 | 2003-08-19 | Hokuetsu Kogyo Co Ltd | Screw tooth form machining method and device for screw rotor |
| CN201070694Y (en) * | 2007-06-26 | 2008-06-11 | 贵州群建齿轮有限公司 | Dual column worm milling cutter |
| CN201249304Y (en) * | 2008-09-08 | 2009-06-03 | 浙江大学 | Numerical control five-axis three-linked motion plane annular enveloping worm cyclone cutting machine tool |
| CN103182564A (en) * | 2013-03-25 | 2013-07-03 | 北京工商大学 | Turning-milling linkage machining method of large-pitch worm |
-
2014
- 2014-10-23 CN CN201410569108.2A patent/CN104439538A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20020067966A1 (en) * | 2000-12-01 | 2002-06-06 | Yaxiong Zhang | Method of forming milled tooth of variable tooth worm |
| JP2003231021A (en) * | 2002-02-12 | 2003-08-19 | Hokuetsu Kogyo Co Ltd | Screw tooth form machining method and device for screw rotor |
| CN201070694Y (en) * | 2007-06-26 | 2008-06-11 | 贵州群建齿轮有限公司 | Dual column worm milling cutter |
| CN201249304Y (en) * | 2008-09-08 | 2009-06-03 | 浙江大学 | Numerical control five-axis three-linked motion plane annular enveloping worm cyclone cutting machine tool |
| CN103182564A (en) * | 2013-03-25 | 2013-07-03 | 北京工商大学 | Turning-milling linkage machining method of large-pitch worm |
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Application publication date: 20150325 |
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