CN102560317B - Screw rod and production method thereof - Google Patents
Screw rod and production method thereof Download PDFInfo
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- CN102560317B CN102560317B CN201110369667.5A CN201110369667A CN102560317B CN 102560317 B CN102560317 B CN 102560317B CN 201110369667 A CN201110369667 A CN 201110369667A CN 102560317 B CN102560317 B CN 102560317B
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Abstract
The invention provides a screw rod and a production method thereof, whereby the consumption caused by wear and contact of parts can be prevented. The production method comprises: (i) preparing a first powder comprising B of 5-9 wt%, Cr of 9-11wt%, Si and Ni of 4-5 wt%; (ii) preparing a second powder comprising metallic element M, wherein the second powder is W or Mo; (iii) mixing the first and the second powder to obtain the thermal spraying powder, wherein the mixing rate of the first and the second powder is that, calculated with molar ratio, the M:B is 0.75:1 to 1:1; (iv) forming a thermal spraying film on the surface of the part; (v) performing the thermal spraying film in order to form boride Ni(MxBy).
Description
Technical field
The application advocates the right of priority of No. 2010-258140th, Japanese patent application based on November 18th, 2010 application.The full content of its application is by reference to being applied in this specification sheets.
The present invention relates to a kind of manufacture method and screw rod of screw rod.
Background technology
Conventionally, the injection device of injection moulding machine is configured to, and heats and from the formed material (resin etc.) of injection nozzle injection melting and be filled to the die cavity space of mould device in heating cylinder.
The screw rod of common injection device by screw head, screw rod main body, be disposed at screw head radial outside non-return circle and be disposed in sealing-ring between screw rod main body and screw head etc. and form (for example patent documentation 1).Screw rod is arranged to rotatable in heating cylinder and can advances and retreat.Non-return circle is arranged in heating cylinder and can moves vertically, and can with sealing-ring contact separation.Non-return circle and sealing-ring have the effect of following situation of inhibition, in the operation of injecting forming material, for from injection nozzle injecting forming material and screw rod while advancing, be positioned at than screw rod first watch formed material on the front a part rearward flow backwards.
Patent documentation 1: TOHKEMY 2007-290284 communique
As in the injection moulding machine of aforementioned formation, between this injection moulding machine on-stream period, screw head, non-return circle and seals and other component constantly slide and/or butt repeatedly mutually.Therefore, in situation, the consumption causing because of wearing and tearing or the butt of these parts becomes problem sometimes after long time running injection moulding machine etc.
Summary of the invention
The present invention completes in view of this background, the object of the present invention is to provide a kind of manufacture method of the screw rod that can on purpose suppress the consumption causing because of wearing and tearing or the butt of component parts.In addition, the object of the present invention is to provide a kind of screw rod with that feature.
The invention provides a kind of manufacture method of screw rod, described screw rod has: screw head; Screw rod main body; Sealing-ring, is arranged between described screw head and described screw rod main body; And non-return circle, there are front-end and back-end, and be configured to that described front end becomes described screw head side and described rear end becomes described sealing-ring side, and can move vertically, it is characterized in that, this manufacture method has:
(i) prepare to comprise the operation of counting the 1st powder of 5～9% B (boron), 9～11% Cr (chromium), 4～5% Si (silicon) and Ni (nickel) with weight ratio;
(ii) operation of the 2nd powder that preparation comprises metallic element M, wherein, the 2nd powder is W (tungsten) and/or Mo (molybdenum);
(iii) mix the described the 1st and the 2nd powder and obtain the operation of hot spray powder, wherein, described the 2nd powder is mixed into respect to described the 1st powder, with molar ratio computing M: B (boron) become 0.75: 1～1: 1;
(iv) utilize at least one parts in screw head described in described hot spraying powder foot couple, described non-return circle and described sealing-ring to carry out thermospray, form the operation of thermal spray membrane at least a portion of described any one parts; And
(v) described thermal spray membrane is heat-treated to form boride Ni (M
xb
y) operation.
In based on manufacture method of the present invention, the particle diameter of described the 1st powder can be in the scope of 45 μ m～90 μ m, and/or
The particle diameter of described the 2nd powder can be in the scope of 13.5 μ m～17.5 μ m.
And, in based on manufacture method of the present invention, described thermal spray membrane can be arranged at least one place of the position of the rear end butt of the described front end of the position of the front end butt of described screw head and described non-return circle, described non-return circle and the position of described screw head butt, the described rear end of described non-return circle and the position of described sealing-ring butt and described sealing-ring and described non-return circle.
In addition, the invention provides a kind of screw rod, it has: screw head; Screw rod main body; Sealing-ring, is arranged between described screw head and described screw rod main body; And non-return circle, there are front-end and back-end, and be configured to that described front end becomes described screw head side and described rear end becomes described sealing-ring side, and can move vertically, it is characterized in that,
In position, the described front end of described non-return circle and the position of described screw head butt, the described rear end of described non-return circle and the position of described sealing-ring butt of front end butt of described screw head and described non-return circle and at least one place of the position of the rear end butt of described sealing-ring and described non-return circle thermal spray membrane is set
This thermal spray membrane comprises boride Ni (M
xb
y), wherein, M is molybdenum and/or tungsten, the amount of boron is in the scope of 5wt%～9wt%.
Invention effect
The present invention can provide a kind of manufacture method of the screw rod that can on purpose suppress the consumption causing because of wearing and tearing or the butt of component parts.In addition, the present invention can provide a kind of screw rod with that feature.
Brief description of the drawings
Fig. 1 is the figure that roughly represents an example of the injection device that possesses the screw rod producing by manufacture method involved in the present invention.
Fig. 2 is the figure that roughly represents an example of the manufacture method of screw rod involved in the present invention.
Fig. 3 is the figure that roughly represents the structure of wear resistance evaluation experimental device.
In figure: 100-injection device, 111-heating cylinder, 112-screw rod, 113-screw rod main body, 131-screw head, 132-leading section, 139-reducing diameter part, 140-non-return circle, 142-gap, 145-sealing-ring, 148-scraper plate, 149-spiral groove, 300-testing apparatus, 310-test portion, 320-circle, L11-outrigger shaft.
Embodiment
Below, with reference to accompanying drawing, the present invention will be described.
The sectional view of one example of the injection device that possesses the screw rod producing by manufacture method involved in the present invention is roughly shown in Fig. 1.
As shown in Figure 1, the injection device 100 that possesses the screw rod producing by manufacture method involved in the present invention possesses screw rod 112 in heating cylinder 111.Heating cylinder 111 is made up of the cylinder parts with outrigger shaft L11, supplies with formed material (being for example resin) from hopper (not shown).And screw rod 112 is adapted to along described outrigger shaft L11 and can advances and retreat in heating cylinder 111 and rotatable.
Screw rod 112 has screw rod main body 113, screw head 131, non-return circle 140 and sealing-ring 145.Screw rod main body 113 has along spiral groove 149 from spiral helicine scraper plate 148 to radial outside that give prominence to and be formed as.Screw head 131 is installed on the front end of sealing-ring 145, and has first end 132 and reducing diameter part 139.On the first end 132 of screw head 131, be formed with multiple level troughs parallel with outrigger shaft L11 (not shown).Non-return circle 140 is arranged to and can moves along the axle L11 direction of heating cylinder 111 at the radial outside of the reducing diameter part 139 of screw head 131.Sealing-ring 145 is configured in (being also between screw rod main body 113 and non-return circle 140) between screw rod main body 113 and the reducing diameter part 139 of screw head 131 simultaneously.
In the time that injection device 100 moves, described screw rod 112 rotates by the driving of motor (not shown).Thus, the formed material being supplied in heating cylinder 111 from hopper (not shown) advances in the direction of the interior arrow 160 to Fig. 1 of spiral slot 149.Formed material is melted and mixes during advancing in heating cylinder 111.
And, by the pressure of formed material, the rear end butt of the first end 132 of the front end of non-return circle 140 and screw head 131.Therefore, the gap 142 of formed material through non-return circle 140 and the reducing diameter part 139 of screw head 131, further by the level trough of leading section 132.Formed material lodges in the front of the first end 132 of screw head 131, and screw rod 112 retreats by the formed material accumulating.
And if motor (not shown) is driven, screw rod 112 advances to the direction of arrow 160.With this, the formed material that lodges in the front of screw head 131 is injected from injection nozzle (not shown), and is filled to the die cavity space of mould device (not shown).Afterwards, the formed material sclerosis that is cooled in die cavity space, thus form products formed.
But, screw rod 112 is advanced, during from injection nozzle (not shown) injecting forming material, lodge in than a part for screw head 131 formed material more on the front and want rearward to flow backwards.
But, now, the pressure flowing backwards by formed material, the rear end of non-return circle 140 is by the front end that is pressed in sealing-ring 145.Therefore,, than the abutting part of sealing-ring 145 and non-return circle 140 side and being more sealed by rear side more on the front, can avoid formed material rearward refluence in heating cylinder 111.In addition, while retreating for fear of screw rod 112, non-return circle 140 departs from screw rod 112, and the internal diameter of non-return circle 140 is configured to the maximum outside diameter of the first end 132 that is less than screw head 131.
At this, in common injection moulding machine, between this injection moulding machine on-stream period, the first end of screw head, non-return circle and seals and other component can constantly slide and/or butt repeatedly mutually.Therefore, in situation, the consumption causing because of wearing and tearing or the butt of these parts becomes problem sometimes after long time running injection moulding machine etc.
But, in based on screw rod 112 of the present invention, there is following feature: at least at least abutting part of at least one parts in first end 132, non-return circle 140 and the sealing-ring 145 of screw head 131 is provided with thermal spray membrane.
For example, in the example of Fig. 1, in the first end 132 of screw head 131 with the region A of non-return circle 140 butts, non-return circle 140 in the region B1 of first end 132 butts of screw head 131 and be provided with thermal spray membrane with region C and the sealing-ring 145 of sealing-ring 145 butts with the region D of non-return circle 140 butts.In addition, in the example of Fig. 1, in the front of non-return circle 140, directly and the region B2 of first end 132 butts of screw head 131 be also provided with thermal spray membrane.
And this thermal spray membrane contains metal boride Ni (M
xb
y), as following detailed description, there is good wear resistance and toughness.
Therefore, can on purpose suppress based on screw rod 112 of the present invention the consumption causing because of wearing and tearing or the butt of component parts.And the replacing frequency of each component parts reduces thus, and the life-span that can improve injection moulding machine 100.
(based on the manufacture method of injection moulding machine of the present invention)
Then, with reference to figure 2, an example of the manufacture method based on screw rod 112 of the present invention is described.
One example of the manufacture method based on injection moulding machine of the present invention is roughly shown in Fig. 2.
As shown in Figure 2, have based on method of the present invention: prepare to comprise using weight ratio and count 5～9% B (boron), 9～11% Cr (chromium), 4～5% Si (silicon) and the operation (step S110) as the 1st powder of the Ni (nickel) of base material; The operation of the 2nd powder that preparation comprises metallic element M, wherein, the 2nd powder is W (tungsten) and/or Mo (molybdenum) (step S120); Mix the described the 1st and the 2nd powder and obtain the operation of hot spray powder, wherein, described the 2nd powder is mixed into respect to described the 1st powder, becomes 0.75: 1～1: 1 (step S130) with molar ratio computing M: B (boron); Utilize at least one parts in described hot spraying powder foot couple screw head, non-return circle and sealing-ring to carry out thermospray, form the operation (step S140) of thermal spray membrane at least a portion of described any one parts; And described thermal spray membrane is heat-treated to form boride Ni (M
xb
y) operation (step S150).Below, each step is elaborated.
(step S110)
First, prepare the 1st powder.The 1st powder is to comprise Ni (nickel) alloy of counting 5～9% B (boron), 9～11% Cr (chromium), 4～5% Si (silicon) with weight ratio.
The particle diameter of the 1st powder is not particularly limited, and for example particle diameter can be in the scope of 45 μ m～90 μ m.Powder in this particle size range can obtain like a cork by the screening based on sieve.
(step S120)
Then the 2nd powder that, preparation comprises metallic element M.Metallic element M is W (tungsten) and/or Mo (molybdenum).
The particle diameter of the 2nd powder is not particularly limited, and for example particle diameter can be in the scope of 13.5 μ m～17.5 μ m.Powder in this particle size range can obtain like a cork by the screening based on sieve.
(step S130)
Then, mix the 1st powder and the 2nd powder, preparation hot spray powder.Preferably the 2nd powder is mixed into respect to the 1st powder, with molar ratio computing metallic element M: B (boron) become 0.75: 1～1: 1.
Blending means is not particularly limited.
(step S140)
Then, utilize the hot spray powder of preparing in step S130, on the surface of object parts, thermal spray membrane is set.
Object parts are at least one in screw head 131, non-return circle 140 and sealing-ring 145.And, about Construction of Thermal Spraying position, when the screw head 131, it is the position (with reference to the A of figure 1) of first end 132 and non-return circle 140 butts, till when loop 140, be with the abutting part of the first end 132 of screw head 131 and/or with the abutting part of sealing-ring 145 (respectively with reference to figure 1 B1 and C), during for sealing-ring 145, be the position (with reference to the D of figure 1) with non-return circle 140 butts.But, be more than denoted as minimum Construction of Thermal Spraying region, can also carry out thermospray in other positions in addition.For example, can with opposed of region (with reference to the B2 of figure 1), inner face with heating cylinder 111 non-return circle 140 and opposed of reducing diameter part 139 screw head 131 and/or non-return circle 140 of first end 132 butts of screw head 131 etc., thermal spray membrane be set in the front of non-return circle 140.
The method of thermospray is not particularly limited, and thermospray can be plasma thermal sprayed, flame heat spray or heat of explosion spraying etc.In addition, thermospray condition is not particularly limited, and thermospray can be carried out under general condition in the past.In addition, before carrying out thermospray, can implement to the surface of object parts the pre-treatment such as sandblasting.
In addition, in this application, can measure by the following method the concentration of thermospray contained each element, especially B (boron), W (tungsten) and Mo (molybdenum) in the thermal spray membrane at each position.
First, peel off the thermal spray membrane of determination object and pulverize from construction part.Then, will after the thermal spray membrane sample weighing of pulverizing, be dissolved in acid solution.
Analyze contained desirable concentration of element in the solution that this thermal spray membrane sample dissolves according to inductively coupled plasma atomic emission spectrum analytical method (Inductively Coupled Plas ma-Atomic Emission Spectrometry:ICP-AES).
(step S150)
Then, thermal spray membrane is heat-treated.
In order to make boron and metallic element M in thermal spray membrane react to generate metal boride Ni (M
xb
y) and the thermal treatment of enforcement thermal spray membrane.
The heat-treat condition of thermal spray membrane is not particularly limited, and thermal treatment can be carried out under general condition in the past.For example, can heat-treat by thermal spray membrane being remained in a vacuum to 1200 DEG C of above temperature.
Thus, in thermal spray membrane, form metal boride Ni (M
xb
y).This metal boride Ni (M
xb
y) contribute to improve the wear resistance of thermal spray membrane.Especially, in the present invention, metal W (tungsten) and/or metal M o (molybdenum) in thermal spraying alloy, have been added.These metals are the element of being easily combined with B (boron) thermodynamics, therefore, in the present invention, can generate metal boride Ni (M by low weight loose ground
xb
y).
In addition, think all the time, improve the wear resistance of thermal spray membrane, preferably more as far as possible contain boron in thermal spraying alloy and and this boron between form the metallic element M of metal boride.
But the discoveries such as present inventor, if contained metal boride Ni (M in thermal spray membrane on the contrary
xb
y) too much, there is the danger that tensile strength declines and toughness declines of thermal spray membrane.Therefore,, in the present invention, the amount that Ni-B is associated B contained in gold is suppressed in 6wt%～8wt%.Thus, less reduce the toughness of thermal spray membrane, just can manifest higher wear resistance.
[embodiment]
Below, embodiments of the invention are described.
(embodiment 1)
Prepare by the following method thermal spraying alloy.
First, prepare particle diameter at the Ni-B-Cr-Si powdered alloy (the 1st powder: purity 99.8%) of the scope of 45 μ m～90 μ m and particle diameter the tungsten powder (the 2nd powder: purity 99.8%) in the scope of 13.5 μ m～17.5 μ m.The composition of the 1st powder is made as Ni-6wt%B-10wt%Cr-4.5wt%Si.
Then, in mixing machine, put into the 1st powder and the 2nd powder, these are mixed.The mode that becomes 1: 1 with the mol ratio (W: B) of the tungsten in mixture and boron has been added the 1st powder and the 2nd powder.
Then, utilize the hybrid alloys powder obtaining on base material, to carry out plasma thermal sprayed.Base material has used SCM440 material (Cr-Mo silk screen).Before carrying out thermospray, base material carried out to sandblasting by thermospray face.
Under following general condition, implement plasma thermal sprayed:
Electric current: 500A,
Voltage: 65V,
Carrier gas (argon gas) flow: 18.5SCFH and
Fuel feed hydrogen flow: 15SCFH.
The thickness of thermal spray membrane is taking 1mm as target.
Then, the thermal spray membrane obtaining is remained in the vacuum of high temperature (more than 1200 DEG C), and heat-treat.After thermal treatment, the tungsten and the boron that confirm in thermal spray membrane react, and have generated boride (WB).
The thermospray test portion obtaining by above method is called to the related test portion of embodiment 1.
(embodiment 2)
Make the related test portion of embodiment 2 by the method identical with embodiment 1.But in embodiment 2, the composition of the 1st powder is made as Ni-8wt%B-10wt%Cr-4.5wt%Si.Other manufacturing conditions are identical with embodiment 1.
(comparative example 1)
Make the related test portion of comparative example 1 by the method identical with embodiment 1.But in comparative example 1, the composition of the 1st powder is made as Ni-3wt%B-10wt%Cr-4.5wt%Si.Other manufacturing conditions are identical with embodiment 1.
(comparative example 2)
Make the related test portion of comparative example 2 by the method identical with embodiment 1.But in comparative example 2, the composition of the 1st powder is made as Ni-10wt%B-10wt%Cr-4.5wt%Si.Other manufacturing conditions are identical with embodiment 1.
(evaluation)
Then, utilize the each test portion obtaining to carry out the evaluation test of wear resistance.
The evaluation of wear resistance, taking specific wear amount S as index, is implemented by the method illustrating below.
The structure of testing apparatus 300 is roughly shown in Fig. 3.As shown in Figure 3, testing apparatus 300 is made up of the circle 320 on the top that is disposed at test portion 310.
Utilize this testing apparatus 300 above test portion 310 with load w by the state of trim ring 320, make to enclose 320 with the 2.4m/ rotating speed rotation of second.After the scheduled time, stop enclosing 320 rotation, measure the loss volume V of test portion 310.
Utilize loss volume V to calculate specific wear amount S by following formula (1):
S=V/wL formula (1)
Wherein, L is the sliding distance (, the distance that test portion 310 and circle 320 slide) of circle 320, and it can calculate from test period.
From formula (1), specific wear amount S becomes the index of wear resistance, and S is less for specific wear amount, and the wear resistance of test portion 310 is more excellent.
In addition, in the time testing, do not make with lubricator.
Show the result in table 1.
[table 1]
From the evaluation test result of this wear resistance, embodiment 1 and the related test portion of embodiment 2 have the roughly equal wear resistance of the test portion related with comparative example 2.Known compared with other test portions on the other hand, the related test portion wear resistance of comparative example 1 is poor.In the related test portion of comparative example 1, in thermal spraying alloy, the quantitative change of contained boron is few to 3wt%.Can think thus, in the related test portion of comparative example 1, the amount of the tungsten boride generating by thermal treatment is less, fails to obtain sufficient wear resistance and improves effect.
Then, utilize the each test portion obtaining to carry out the evaluation test of toughness.
The evaluation of toughness is implemented by 3 pliability tests.That is, from test portion top with the pinblock translational speed of 1mm/ minute to test portion load application, the load while destruction from test portion and the sectional area of test portion are obtained rupture stress (folding strength).Length of support is from being made as 20mm.In addition, go out folding strength as the mean value calculation in 4 above identical test portions.
Show the result in aforementioned table 1.
From the evaluation test result of this toughness, compared with comparative example 1 and the related test portion of comparative example 2, the related test portion folding strength of embodiment 1 and embodiment 2 improves significantly.This can think, is because in the related test portion of comparative example 2, generates in a large number metal boride by thermal treatment.On the other hand, think in embodiment 1 and the related test portion of embodiment 2, can avoid generating superfluous metal boride, on purpose suppressed toughness decline.
So confirm, can obtain all good thermal spray membranes of wear resistance and toughness by using based on thermal spraying alloy of the present invention.
Utilizability in industry
The present invention can be applied to injection moulding machine etc.
Claims (4)
1. a manufacture method for screw rod, described screw rod has: screw head; Screw rod main body; Sealing-ring, is arranged between described screw head and described screw rod main body; And non-return circle, there are front-end and back-end, and be configured to described front end become can with one end of described screw head butt, and described rear end become can with one end of described sealing-ring butt, and can move vertically, it is characterized in that, this manufacture method has:
(i) prepare to comprise the operation of counting the 1st powder of 5～9% B, 9～11% Cr, 4～5% Si and Ni with weight ratio, wherein B is that boron, Cr are that chromium, Si are that silicon, Ni are nickel;
(ii) the operation of preparing the 2nd powder that comprises metallic element M, wherein, the 2nd powder is W and/or Mo, wherein W is that tungsten, Mo are molybdenum;
(iii) mix the described the 1st and the 2nd powder and obtain the operation of hot spray powder, wherein, described the 2nd powder is mixed into respect to described the 1st powder, and with molar ratio computing, M:B becomes 0.75:1～1:1, and wherein B is boron;
(iv) utilize at least one parts in screw head described in described hot spraying powder foot couple, described non-return circle and described sealing-ring to carry out thermospray, form the operation of thermal spray membrane at least a portion of described any one parts; And
(v) described thermal spray membrane is heat-treated to form boride Ni(M
xb
y) operation.
2. manufacture method as claimed in claim 1, is characterized in that,
The particle diameter of described the 1st powder is in the scope of 45 μ m～90 μ m, and/or
The particle diameter of described the 2nd powder is in the scope of 13.5 μ m～17.5 μ m.
3. manufacture method as claimed in claim 1 or 2, is characterized in that,
Described thermal spray membrane is arranged at least one place of the position of the rear end butt of the described front end of the position of the front end butt of described screw head and described non-return circle, described non-return circle and the position of described screw head butt, the described rear end of described non-return circle and the position of described sealing-ring butt and described sealing-ring and described non-return circle.
4. a screw rod, it has: screw head; Screw rod main body; Sealing-ring, is arranged between described screw head and described screw rod main body; And non-return circle, there are front-end and back-end, and be configured to described front end become can with one end of described screw head butt, and described rear end become can with one end of described sealing-ring butt, and can move vertically, it is characterized in that,
In position, the described front end of described non-return circle and the position of described screw head butt, the described rear end of described non-return circle and the position of described sealing-ring butt of front end butt of described screw head and described non-return circle and at least one place of the position of the rear end butt of described sealing-ring and described non-return circle thermal spray membrane is set
This thermal spray membrane comprises boride Ni(M
xb
y), wherein, M is molybdenum and/or tungsten, the amount of boron is in the scope of 5wt%～9wt%.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2010258140 | 2010-11-18 | ||
| JP258140/2010 | 2010-11-18 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102560317A CN102560317A (en) | 2012-07-11 |
| CN102560317B true CN102560317B (en) | 2014-11-19 |
Family
ID=46406911
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201110369667.5A Expired - Fee Related CN102560317B (en) | 2010-11-18 | 2011-11-18 | Screw rod and production method thereof |
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| Country | Link |
|---|---|
| CN (1) | CN102560317B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP6739880B2 (en) * | 2017-09-22 | 2020-08-12 | 株式会社日本製鋼所 | Screw of metal injection molding machine |
| CN112080678B (en) * | 2020-09-15 | 2021-12-21 | 广东博杰特新材料科技有限公司 | Ternary boride alloy screw material and production process thereof |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6155816A (en) * | 1995-10-04 | 2000-12-05 | Engel Maschinenbau Gesellschaft M.B.H. | Return flow shut-off device for an injection unit in an injection moulding machine |
| CN1944712A (en) * | 2006-10-30 | 2007-04-11 | 大庆油田有限责任公司 | Method for treating screw pump two-way protective coupling surface |
| CN101303014A (en) * | 2008-04-25 | 2008-11-12 | 大庆油田有限责任公司 | Method for processing chemical composite flooding ceramic anti-scaling screw pump rotor |
-
2011
- 2011-11-18 CN CN201110369667.5A patent/CN102560317B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6155816A (en) * | 1995-10-04 | 2000-12-05 | Engel Maschinenbau Gesellschaft M.B.H. | Return flow shut-off device for an injection unit in an injection moulding machine |
| CN1944712A (en) * | 2006-10-30 | 2007-04-11 | 大庆油田有限责任公司 | Method for treating screw pump two-way protective coupling surface |
| CN101303014A (en) * | 2008-04-25 | 2008-11-12 | 大庆油田有限责任公司 | Method for processing chemical composite flooding ceramic anti-scaling screw pump rotor |
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|---|---|
| CN102560317A (en) | 2012-07-11 |
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