CN110242561A  A kind of the big flow screw rotor and its design method of Quimby pump  Google Patents
A kind of the big flow screw rotor and its design method of Quimby pump Download PDFInfo
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 CN110242561A CN110242561A CN201910670831.2A CN201910670831A CN110242561A CN 110242561 A CN110242561 A CN 110242561A CN 201910670831 A CN201910670831 A CN 201910670831A CN 110242561 A CN110242561 A CN 110242561A
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 arc
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 molded line
 screw rotor
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 230000005540 biological transmission Effects 0.000 claims abstract description 10
 230000001154 acute Effects 0.000 claims abstract description 5
 210000004746 Tooth Root Anatomy 0.000 claims description 39
 239000000562 conjugates Substances 0.000 claims description 24
 239000011159 matrix materials Substances 0.000 claims description 3
 230000001131 transforming Effects 0.000 claims description 3
 239000011257 shell materials Substances 0.000 claims description 2
 238000004519 manufacturing process Methods 0.000 abstract description 4
 238000007789 sealing Methods 0.000 abstract description 3
 239000007788 liquids Substances 0.000 description 2
 238000000034 methods Methods 0.000 description 2
 238000005039 chemical industry Methods 0.000 description 1
 238000006073 displacement reactions Methods 0.000 description 1
 230000004048 modification Effects 0.000 description 1
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Classifications

 F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
 F04—POSITIVE  DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
 F04C—ROTARYPISTON, OR OSCILLATINGPISTON, POSITIVEDISPLACEMENT MACHINES FOR LIQUIDS; ROTARYPISTON, OR OSCILLATINGPISTON, POSITIVEDISPLACEMENT PUMPS
 F04C2/00—Rotarypiston machines or pumps
 F04C2/08—Rotarypiston machines or pumps of intermeshingengagement type, i.e. with engagement of cooperating members similar to that of toothed gearing
 F04C2/12—Rotarypiston machines or pumps of intermeshingengagement type, i.e. with engagement of cooperating members similar to that of toothed gearing of other than internalaxis type
 F04C2/14—Rotarypiston machines or pumps of intermeshingengagement type, i.e. with engagement of cooperating members similar to that of toothed gearing of other than internalaxis type with toothed rotary pistons
 F04C2/16—Rotarypiston machines or pumps of intermeshingengagement type, i.e. with engagement of cooperating members similar to that of toothed gearing of other than internalaxis type with toothed rotary pistons with helical teeth, e.g. chevronshaped, screw type

 G06F17/5086—

 F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
 F04—POSITIVE  DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
 F04C—ROTARYPISTON, OR OSCILLATINGPISTON, POSITIVEDISPLACEMENT MACHINES FOR LIQUIDS; ROTARYPISTON, OR OSCILLATINGPISTON, POSITIVEDISPLACEMENT PUMPS
 F04C2240/00—Components
 F04C2240/20—Rotors
Abstract
The invention discloses the big flow screw rotors and its design method of a kind of Quimby pump, the left side molded line (101) of its left screw rotor (1) is made of 4 sections of curves and 1 point: 1 section of curtate epicycloid equidistant curve, 1 section of variable speed screw line, 2 sections of circular arcs, and acute angle cusp is not present in molded line；The right side molded line (201) of right screw rotor (2) is made of 10 sections of curves: 2 sections of prolate epicycloids, 2 sections of speed change helical envelopes, 6 sections of circular arcs, in the incorgruous dual AC power movement that left screw rotor (1) and right screw rotor (2) transmission ratio are 2 to 1, left side molded line (101) and right side molded line (201) can correct engagements.The big flow screw rotor proposed improves 15%~25% compared with classic screw rotor, in identical chassis size downoff, meets the flow demand under miniaturization manufacture, and structure is more compact, and sealing and stress performance are good.
Description
Technical field
The present invention relates to Quimby pumps, in particular to are suitable for a kind of big flow screw rotor of Quimby pump.
Background technique
Quimby pump is a kind of proof positive displacement liquid pump, is formed in the pump housing by two intermeshing screw rotors multiple
Closing chamber, under the drive of gear, a pair of of screw rotor does the movement of incorgruous dual AC power in pump chamber, seal chamber continuously from
The outlet of pump is shifted in the import of pump, is completed the sucking, pressurization and discharge process of medium, is realized the conveying of liquid.Quimby pump tool
There are pulse free, with small vibration, high reliablity, the distinguishing feature that stability is good, suction capacity is strong, is widely used at present in oil field, makes
Ship industry, petro chemical industry, field of food industry.
In the Design and manufacturing process of screw pump, the design of screw rotor end face molded line has larger impact to the performance of pump.
Common Quimby pump profile is made of cycloid and involute, and is mostly 1 to 1 transmission.To improve common twinscrew
The performance of rotor, Chinese patent (patent No. CN201720524780.9) propose a kind of complete smooth dualscrew pump screw turn
Son, the rotor replace common point gearing cycloid using two sections of circular arcs and its envelope, alleviate the wear problem at cusp, structure
It being smoothly connected between curve, molded line is properly engaged with completely, have the advantages that good sealing performance, mechanical characteristic are good, but
Cause the problem that capacity utilization is low, flow is small.With social development, the screw pump demand of small dimension is increasingly increased
Add, conventional twin screw pump is applied in big flow occasion mostly, and structure is complicated.How minimize manufacture when meet traffic requirement
And guarantee that good sealing and stress performance become the key of problem.
Summary of the invention
The present invention is in order to improve the flow of Quimby pump, while in order to enrich dualscrew pump screw rotor endface molded line class
Type, the present invention propose a kind of big flow screw rotor of Quimby pump.The tip circle and root radius of two screw rods are equal, and left screw rod turns
The transmission ratio of sub and right screw rotor be 2 to 1, identical casings size downoff than original Quimby pump raising 15%~
25%, it is more more simple and compact than original Quimby pump structure in same traffic.The present invention is sliding using variable speed screw linear light
The addendum circle arc and tooth root circular arc in the molded line of left side are connected, and acquires variable speed screw line in the case where transmission ratio is 2 to 1
Conjugate curves, engage curtate epicycloid equidistant curve using circular arc, and in right side, molded line realizes addendum circle arc and tooth root circular arc
It is smoothly connected, and combines prolate epicycloid, form symmetrical structure.The flow for increasing Quimby pump, improve screw rotor by
Power situation improves the performance of Quimby pump, type and its work of raising to abundant dualscrew pump screw rotor endface molded line
Performance is of great significance.
To achieve the goals above, the present invention adopts the following technical scheme:
A kind of big flow screw rotor of Quimby pump, comprising: left screw rotor and right screw rotor；Left screw rotor
Left side molded line is made of 4 sections of curves and 1 point, in the direction of the clock successively are as follows: curtate epicycloid equidistant curve AB, point B, tooth
Tip circle arc BC, variable speed screw line CD, tooth root circular arc DA；Variable speed screw line CD in the left side molded line glossily tooth connection
Acute angle cusp is not present in tip circle arc BC and tooth root circular arc DA；
The right side molded line of right screw rotor is made of 10 sections of curves, counterclockwise successively are as follows: is put outside the first long width
Line ab, the first tooth root circular arc bc, the first variable speed screw line conjugate curves cd, the first addendum circle arc de, the first tip circulararc ef,
Two prolate epicycloid fg, the second tooth root circular arc gh, the second variable speed screw line conjugate curves hi, the second addendum circle arc ij, the second tooth
Sharp circular arc ja；Right side molded line is about its centre of gyration O_{2}Be it is centrosymmetric, i.e., with centre of gyration O_{2}Centered on by right side type
Line coincides after rotating 180 ° with its own.
A kind of big flow screw rotor of Quimby pump, left side molded line and right side molded line are in left screw rotor
It can be realized correct engagement, meshing relation in the incorgruous dual AC power movement for being 2 to 1 with right screw rotor transmission ratio are as follows: left end
The point B of face molded line is meshed with the first prolate epicycloid ab of right side molded line, the second prolate epicycloid fg；Left side molded line
Curtate epicycloid equidistant curve AB is meshed with the first tip circulararc ef of right side molded line, the second tip circulararc ja；Left side
The addendum circle arc BC of molded line is meshed with the first tooth root circular arc bc of right side molded line, the second tooth root circular arc gh；Left side molded line
Variable speed screw line CD and right side molded line the first variable speed screw line conjugate curves cd, the second variable speed screw line conjugate curves hi
It is meshed；The tooth root circular arc DA of left side molded line is nibbled with the first addendum circle arc de of right side molded line, the second addendum circle arc ij phase
It closes.
A kind of design method of the big flow screw rotor of the Quimby pump the following steps are included:
1) following parameter is given: left pitch radius R_{1}；Root radius R_{2}；Radius of addendum R_{3}；The center variable speed screw line CD
Angle θ；Curtate epicycloid equidistant curve AB central angle alpha；First tip circulararc radius r；Right pitch radius R is acquired by following relationship_{4}、
First radius of addendum R_{5}, the first root radius R_{6}: R_{4}=2R_{1}；R_{5}=R_{3}；R_{6}=R_{2}；
2) with the centre of gyration O of left screw rotor_{1}Coordinate system is established for origin, determines tooth root circular arc DA by following equation:
In formula: t is angle parameter, rad；
3) addendum circle arc BC is determined by following equation:
4) curtate epicycloid equidistant curve AB is determined by following equation:
Wherein:
In formula: M_{AB}For rotational transformation matrix, β is rotation angle,For initial curtate epicycloid Equidistant curve equation, L
For rotor centre distance, L=R_{1}+R_{4}；
5) variable speed screw line CD is determined by following equation:
6) with the centre of gyration O of right screw rotor_{2}Coordinate system is established for origin, determines the first tooth root circular arc by following equation
Bc:
7) the first addendum circle arc de is determined by following equation:
8) the first variable speed screw line conjugate curves cd is determined by following equation:
In formula:For the first intermediate variable, determined by following equation:
9) the first prolate epicycloid ab is determined by following equation:
10) the first tip circulararc ef is determined by following equation:
In formula: X_{ef}、Y_{ef}The respectively abscissa and ordinate in the tip circulararc center of circle；
11) respectively by the first prolate epicycloid ab, the first tooth root circular arc bc, the first variable speed screw line conjugate curves
Cd, the first addendum circle arc de, the first tip circulararc ef are with centre of gyration O_{2}Centered on rotation 180 ° obtain the second prolate epicycloid
Fg, the second tooth root circular arc gh, the second variable speed screw line conjugate curves hi, the second addendum circle arc ij, the second tip circulararc ja；
12) the left side molded line is made into axial screw expansion along left helix and generates left screw rotor；By what is obtained
Right side molded line makees axial screw expansion along righthand helix and generates right screw rotor；Wherein the screw pitch of right screw rotor is left screw rod
2 times of rotor screw pitch.
The invention has the benefit that
1. the tip circle and root radius of two screw rods are equal, the transmission ratio of left screw rotor and right screw rotor is 2 to 1,
Identical casings size downoff improves 15%~25% than the Quimby pump that original transmission ratio is 1 to 1, in same traffic
It is more more simple and compact than original Quimby pump structure, miniaturization manufacture demand is met under the premise of guaranteeing flow.
2. using the engagement system of circular arc and curtate epicycloid equidistant curve, make that acute angle cusp is not present in profile,
The mechanical characteristic for improving screw rotor, improves the service life of screw rotor.
3. enriching dualscrew pump screw rotor endface molded line type.
Detailed description of the invention
Fig. 1 is the left side molded lines of left screw rotor (1).
Fig. 2 is the right side molded lines of right screw rotor (2).
Fig. 3 is two screw rods rotor endface molded line engagement figure.
Fig. 4 engages time chart with the first variable speed screw line conjugate curves for variable speed screw line.
Fig. 5 engages time chart with the first addendum circle arc for tooth root circular arc.
Fig. 6 engages time chart with the first tip circulararc for curtate epicycloid equidistant curve.
Fig. 7 engages time chart with the first tooth root circular arc for addendum circle arc.
Fig. 8 is left screw rotor (1) threedimensional figure.
Fig. 9 is right screw rotor (2) threedimensional figure.
Figure 10 is two screw rods rotor engagement figure.
In figure: 1left screw rotor；2right screw rotors；101left side molded line；201right side molded line；R_{1}—
Left pitch radius；R_{2} root radius；R_{3} radius of addendum；R_{4} right pitch radius；R_{5} the first radius of addendum；R_{6}—
First root radius；The first tip circulararc radius of r；αcurtate epicycloid equidistant curve central angle；θvariable speed screw line
Central angle；βrotation angle.
Specific embodiment
The invention will be further described with embodiment with reference to the accompanying drawing.
As shown in Figure 1, being the left side molded lines of left screw rotor 1, the left side molded line 101 of left screw rotor 1 is by 4 sections
Curve and 1 point composition, in the direction of the clock successively are as follows: curtate epicycloid equidistant curve AB, point B, addendum circle arc BC, speed change spiral shell
Spin line CD, tooth root circular arc DA；Variable speed screw line CD in the left side molded line 101 glossily connects addendum circle arc BC and tooth
Acute angle cusp is not present in root circular arc DA；Molded line generation type is as follows:
1) following parameter is given: left pitch radius R_{1}；Root radius R_{2}；Radius of addendum R_{3}；The center variable speed screw line CD
Angle θ；Curtate epicycloid equidistant curve AB central angle alpha；First tip circulararc radius r；Right pitch radius R is acquired by following relationship_{4}、
First radius of addendum R_{5}, the first root radius R_{6}: R_{4}=2R_{1}；R_{5}=R_{3}；R_{6}=R_{2}；
2) with the centre of gyration O of left screw rotor 1_{1}Coordinate system is established for origin, determines tooth root circular arc DA by following equation:
In formula: t is angle parameter, rad；
3) addendum circle arc BC is determined by following equation:
4) curtate epicycloid equidistant curve AB is determined by following equation:
Wherein:
In formula: M_{AB}For rotational transformation matrix, β is rotation angle,For initial curtate epicycloid Equidistant curve equation,
L is rotor centre distance, L=R_{1}+R_{4}；
5) variable speed screw line CD is determined by following equation:
As shown in Fig. 2, being the right side molded lines of right screw rotor 2, the right side molded line 201 of right screw rotor 2 is by 10
Section curve composition, counterclockwise successively are as follows: the first prolate epicycloid ab, the first tooth root circular arc bc, the first variable speed screw line
Conjugate curves cd, the first addendum circle arc de, the first tip circulararc ef, the second prolate epicycloid fg, the second tooth root circular arc gh, second
Variable speed screw line conjugate curves hi, the second addendum circle arc ij, the second tip circulararc ja；Right side molded line 201 is about in its revolution
Heart O_{2}Be it is centrosymmetric, i.e., with centre of gyration O_{2}Centered on rotation 180 ° after be overlapped with itself；Molded line generation type is as follows:
1) following parameter is given: left pitch radius R_{1}；Root radius R_{2}；Radius of addendum R_{3}；The center variable speed screw line CD
Angle θ；Curtate epicycloid equidistant curve AB central angle alpha；First tip circulararc radius r；Right pitch radius R is acquired by following relationship_{4}、
First radius of addendum R_{5}, the first root radius R_{6}: R_{4}=2R_{1}；R_{5}=R_{3}；R_{6}=R_{2}；
2) with the centre of gyration O of right screw rotor 2_{2}Coordinate system is established for origin, determines the first root circle by following equation
Arc bc:
3) the first addendum circle arc de is determined by following equation:
4) the first variable speed screw line conjugate curves cd is determined by following equation:
In formula:For the first intermediate variable, determined by following equation:
5) the first prolate epicycloid ab is determined by following equation:
6) the first tip circulararc ef is determined by following equation:
In formula: X_{ef}、Y_{ef}The respectively abscissa and ordinate in the tip circulararc center of circle；
7) respectively by the first prolate epicycloid ab, the first tooth root circular arc bc, the first variable speed screw line conjugate curves
Cd, the first addendum circle arc de, the first tip circulararc ef are with centre of gyration O_{2}Centered on rotation 180 ° obtain the second prolate epicycloid
Fg, the second tooth root circular arc gh, the second variable speed screw line conjugate curves hi, the second addendum circle arc ij, the second tip circulararc ja；
As shown in figure 3, left side molded line 101 and right side molded line 201 are on a left side for two screw rods rotor endface molded line engagement figure
It can be realized correct engagement in the incorgruous dual AC power movement that screw rotor 1 and 2 transmission ratio of right screw rotor are 2 to 1；Engagement is closed
System are as follows: the point B of left side molded line 101 is nibbled with the first prolate epicycloid ab of right side molded line 201, the second prolate epicycloid fg phase
It closes；The curtate epicycloid equidistant curve AB of left side molded line 101 and the first tip circulararc ef, the second tooth of right side molded line 201
Sharp circular arc ja is meshed；First tooth root circular arc bc of the addendum circle arc BC of left side molded line 101 and right side molded line 201, second
Tooth root circular arc gh is meshed；The variable speed screw line CD of left side molded line 101 and the first variable speed screw line of right side molded line 201 are total
Yoke curve cd, the second variable speed screw line conjugate curves hi are meshed；The tooth root circular arc DA and right side molded line of left side molded line 101
201 the first addendum circle arc de, the second addendum circle arc ij is meshed.
As shown in figure 4, engage time chart with the first variable speed screw line conjugate curves for variable speed screw line, variable speed screw line and
First variable speed screw line conjugate curves correct engagement.
As shown in figure 5, engaging time chart with the first addendum circle arc for tooth root circular arc, tooth root circular arc and the first addendum circle arc are just
Really engagement.
As shown in fig. 6, engaging time chart with the first tip circulararc for curtate epicycloid equidistant curve, curtate epicycloid is equidistant
Curve and the first tip circulararc correct engagement.
As shown in fig. 7, engaging time chart with the first tooth root circular arc for addendum circle arc, addendum circle arc and the first tooth root circular arc are just
Really engagement.
As shown in figure 8, being left 1 threedimensional figure of screw rotor, the left side molded line 101 is made into axial screw along left helix
Rotation expansion generates left screw rotor 1, and left screw rotor 1 is single head constant pitch screw rod.
As shown in figure 9, being right 2 threedimensional figure of screw rotor, obtained right side molded line 102 is made into axial screw along righthand helix
Rotation expansion generates right screw rotor 2, and right screw rotor 2 is double end constant pitch screw rod.
It as shown in Figure 10, is two screw rods rotor engagement figure, wherein the screw pitch of right screw rotor 2 is left 1 screw pitch of screw rotor
2 times.Two screw rotors can be realized correct engagement in the incorgruous dual AC power movement that transmission ratio is 2 to 1, and there is no interference
Or have neither part nor lot in the part of engagement.
Abovementioned, although the foregoing specific embodiments of the present invention is described with reference to the accompanying drawings, not protects model to the present invention
The limitation enclosed, those skilled in the art should understand that, based on the technical solutions of the present invention, those skilled in the art are not
Need to make the creative labor the various modifications or changes that can be made still within protection scope of the present invention.
Claims (3)
1. a kind of big flow screw rotor of Quimby pump, comprising: left screw rotor (1) and right screw rotor (2)；Its feature
Be: the left side molded line (101) of left screw rotor (1) is made of 4 sections of curves and 1 point, in the direction of the clock successively are as follows: short width
Epicycloid equidistant curve AB, point B, addendum circle arc BC, variable speed screw line CD, tooth root circular arc DA；The left side molded line (101)
In variable speed screw line CD glossily connect addendum circle arc BC and tooth root circular arc DA, be not present acute angle cusp；
The right side molded line (201) of right screw rotor (2) is made of 10 sections of curves, counterclockwise successively are as follows: the first long width
Epicycloid ab, the first tooth root circular arc bc, the first variable speed screw line conjugate curves cd, the first addendum circle arc de, the first tip circulararc
Ef, the second prolate epicycloid fg, the second tooth root circular arc gh, the second variable speed screw line conjugate curves hi, the second addendum circle arc ij,
Two tip circulararc ja；Right side molded line (201) is about its centre of gyration O_{2}Be it is centrosymmetric, i.e., with centre of gyration O_{2}Centered on
It coincides after right side molded line (201) are rotated 180 ° with its own.
2. a kind of big flow screw rotor of Quimby pump as described in claim 1, it is characterized in that: left side molded line (101)
With right side molded line (201) in the incorgruous dual AC power movement that left screw rotor (1) and right screw rotor (2) transmission ratio are 2 to 1
It can be realized correct engagement, meshing relation are as follows: the point B of left side molded line (101) and the first long width of right side molded line (201)
Epicycloid ab, the second prolate epicycloid fg are meshed；The curtate epicycloid equidistant curve AB of left side molded line (101) and right side
The first tip circulararc ef, the second tip circulararc ja of molded line (201) are meshed；The addendum circle arc BC of left side molded line (101) with
The first tooth root circular arc bc, the second tooth root circular arc gh of right side molded line (201) are meshed；The speed change spiral shell of left side molded line (101)
First variable speed screw line conjugate curves cd of the spin line CD with right side molded line (201), the second variable speed screw line conjugate curves hi phase
Engagement；The tooth root circular arc DA of left side molded line (101) and the first addendum circle arc de, second outside circle of right side molded line (201)
Arc ij is meshed.
3. a kind of design method of the big flow screw rotor of Quimby pump as described in claim 1, it is characterized in that: include with
Lower step:
1) following parameter is given: left pitch radius R_{1}；Root radius R_{2}；Radius of addendum R_{3}；Variable speed screw line CD central angle θ；
Curtate epicycloid equidistant curve AB central angle alpha；First tip circulararc radius r；Right pitch radius R is acquired by following relationship_{4}, first
Radius of addendum R_{5}, the first root radius R_{6}: R_{4}=2R_{1}；R_{5}=R_{3}；R_{6}=R_{2}；
2) with the centre of gyration O of left screw rotor (1)_{1}Coordinate system is established for origin, determines tooth root circular arc DA by following equation:
In formula: t is angle parameter, rad；
3) addendum circle arc BC is determined by following equation:
4) curtate epicycloid equidistant curve AB is determined by following equation:
Wherein:
In formula: M_{AB}For rotational transformation matrix, β is rotation angle,For initial curtate epicycloid Equidistant curve equation, L is to turn
Subcenter is away from L=R_{1}+R_{4}；
5) variable speed screw line CD is determined by following equation:
6) with the centre of gyration O of right screw rotor (2)_{2}Coordinate system is established for origin, determines the first tooth root circular arc by following equation
Bc:
7) the first addendum circle arc de is determined by following equation:
8) the first variable speed screw line conjugate curves cd is determined by following equation:
In formula:For the first intermediate variable, determined by following equation:
9) the first prolate epicycloid ab is determined by following equation:
10) the first tip circulararc ef is determined by following equation:
In formula: X_{ef}、Y_{ef}The respectively abscissa and ordinate in the tip circulararc center of circle；
11) respectively by the first prolate epicycloid ab, the first tooth root circular arc bc, the first variable speed screw line conjugate curves cd,
First addendum circle arc de, the first tip circulararc ef are with centre of gyration O_{2}Centered on rotation 180 ° obtain the second prolate epicycloid fg,
Second tooth root circular arc gh, the second variable speed screw line conjugate curves hi, the second addendum circle arc ij, the second tip circulararc ja；
12) the left side molded line (101) is made into axial screw expansion along left helix and generates left screw rotor (1)；Will
To right side molded line (102) make axial screw expansion along righthand helix and generate right screw rotor (2)；Wherein right screw rotor
(2) screw pitch is 2 times of left screw rotor (1) screw pitch.
Priority Applications (1)
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CN201910670831.2A CN110242561A (en)  20190724  20190724  A kind of the big flow screw rotor and its design method of Quimby pump 
Applications Claiming Priority (1)
Application Number  Priority Date  Filing Date  Title 

CN201910670831.2A CN110242561A (en)  20190724  20190724  A kind of the big flow screw rotor and its design method of Quimby pump 
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CN110242561A true CN110242561A (en)  20190917 
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Cited By (1)
Publication number  Priority date  Publication date  Assignee  Title 

CN111367233A (en) *  20200312  20200703  杭州兴龙泵业有限公司  Threedimensional model modeling system for machining doublescrew pump molded lines by disc milling cutter 

2019
 20190724 CN CN201910670831.2A patent/CN110242561A/en active Pending
Cited By (2)
Publication number  Priority date  Publication date  Assignee  Title 

CN111367233A (en) *  20200312  20200703  杭州兴龙泵业有限公司  Threedimensional model modeling system for machining doublescrew pump molded lines by disc milling cutter 
CN111367233B (en) *  20200312  20210316  杭州兴龙泵业有限公司  Threedimensional model modeling system for machining doublescrew pump molded lines by disc milling cutter 
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