CN109177216B - Production method of screw compressor rotor - Google Patents
Production method of screw compressor rotor Download PDFInfo
- Publication number
- CN109177216B CN109177216B CN201810775679.XA CN201810775679A CN109177216B CN 109177216 B CN109177216 B CN 109177216B CN 201810775679 A CN201810775679 A CN 201810775679A CN 109177216 B CN109177216 B CN 109177216B
- Authority
- CN
- China
- Prior art keywords
- wax
- rotor
- screw compressor
- shaft core
- plastic layer
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C69/00—Combinations of shaping techniques not provided for in a single one of main groups B29C39/00 - B29C67/00, e.g. associations of moulding and joining techniques; Apparatus therefore
- B29C69/02—Combinations of shaping techniques not provided for in a single one of main groups B29C39/00 - B29C67/00, e.g. associations of moulding and joining techniques; Apparatus therefore of moulding techniques only
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C18/00—Rotary-piston pumps specially adapted for elastic fluids
- F04C18/08—Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
- F04C18/082—Details specially related to intermeshing engagement type pumps
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C18/00—Rotary-piston pumps specially adapted for elastic fluids
- F04C18/08—Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
- F04C18/12—Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type
- F04C18/14—Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type with toothed rotary pistons
- F04C18/16—Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type with toothed rotary pistons with helical teeth, e.g. chevron-shaped, screw type
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C29/00—Component parts, details or accessories of pumps or pumping installations, not provided for in groups F04C18/00 - F04C28/00
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2031/00—Other particular articles
- B29L2031/08—Blades for rotors, stators, fans, turbines or the like, e.g. screw propellers
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C2240/00—Components
- F04C2240/20—Rotors
Abstract
The invention discloses a production method of a screw compressor rotor, which comprises the following steps: s1, manufacturing a female die with the same appearance characteristics as the helical blade of the rotor of the screw compressor; s2, placing the female die into a molding box, injecting wax in a molten state between the female die and the inner wall of the molding box, standing, cooling and solidifying to form a wax die; s3, screwing the female die out of the wax mold, and then putting the rotor shaft core into the wax mold; s4, injecting liquid resin between the rotor shaft core and the inner wall of the wax mould, and forming a plastic layer coated on the rotor shaft core after the liquid resin is primarily cured; and S5, taking the wax mold, the rotor shaft core and the plastic layer out of the molding box, heating to completely melt the wax mold and completely solidify the plastic layer to obtain the screw compressor rotor. The method is simple, the screw compressor rotor is molded at one time, the precision is high, the raw material of the die can be repeatedly used, the efficiency is high, the environment is protected, and the cost is low.
Description
Technical Field
The invention relates to a production method of a compressor rotor, in particular to a production method of a screw compressor rotor.
Background
The screw compressor is a rotary displacement machine with numerous advantages and wide application, has the advantages of high reliability, few parts, few easily-damaged parts, long service life, stable work, small vibration, high efficiency and the like, but also has the defects of high manufacturing cost, the working core of the screw compressor is a pair of mutually-meshed metal screw rotors, the screw rotors are processed by a series of cutting procedures such as turning, milling, grinding and the like, the three-dimensional tooth surfaces of the screw rotors need to be milled or ground and formed on expensive special equipment through special tools, the processing cost is high, the development of the screw compressor is restricted to a certain extent, particularly in the technical field of water-lubricated screw compressors, water has a certain corrosion effect on the metal screw rotors, and the service life of the water-lubricated screw compressor is shortened. In order to overcome the defects of a metal rotor, the interior of the rotor of the novel screw compressor is provided with a metal core shaft, and the exterior of the metal core shaft is coated with plastic to form the screw rotor. In the prior art, the plastic layer of the rotor is generally formed by injection molding of a mold, the manufacturing cost of a general high-precision mold is high, the demolding mode and the like need to be considered, and the production process is complex.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a production method of a screw compressor rotor, which solves the problems of complex production process and high cost.
The technical scheme of the invention is as follows: a method of producing a screw compressor rotor comprising the steps of:
s1, manufacturing a female die with the same appearance characteristics as the helical blade of the rotor of the screw compressor;
s2, placing the female die into a molding box, injecting wax in a molten state between the female die and the inner wall of the molding box, standing, cooling and solidifying to form a wax die;
s3, screwing the female die out of the wax mold, and then putting the rotor shaft core into the wax mold;
s4, injecting liquid resin between the rotor shaft core and the inner wall of the wax mould, and forming a plastic layer coated on the rotor shaft core after the liquid resin is primarily cured;
and S5, taking the wax mold, the rotor shaft core and the plastic layer out of the molding box, heating to completely melt the wax mold and completely solidify the plastic layer to obtain the screw compressor rotor.
Further, the step S4 is to primarily cure the liquid resin by placing the molding box filled with the liquid resin in an environment of 20 to 40 ℃ for more than 12 hours.
Further, the step S5 of heating to melt the wax mold and to completely solidify the plastic layer is to heat the wax mold for more than 4 hours at 80-100 ℃.
Further, in the step S4, the liquid resin is injected after being stirred for more than 30 minutes in the environment with the vacuum pressure less than or equal to-0.09 MPa.
Further, the liquid resin comprises bisphenol A epoxy resin, polyamide and a filler, wherein the mass ratio of the bisphenol A epoxy resin to the polyamide to the filler is 20: 4-5: 8-10.
Preferably, the filler is powdered graphite.
Compared with the prior art, the technical scheme of the invention has the beneficial effects that: firstly, the screw compressor rotor is formed in one step by adopting injection and casting molding processes, a series of complicated cutting and processing processes such as turning, milling, grinding and the like in the traditional process are omitted, the processing time is saved, the labor cost is reduced, and the production efficiency is improved; secondly, the casting process adopts a paraffin mould, paraffin outside the rotor is removed through heating, and the removed paraffin can be recycled, so that the cost is reduced; thirdly, the pouring process has high precision, no harmful substances are generated in the forming process, the method is green and environment-friendly, is suitable for mass production, and has low cost and high efficiency.
Drawings
Fig. 1 is a schematic view of the rotor structure of the screw compressor produced in example 1.
Fig. 2 is a schematic view of the rotor structure of the screw compressor produced in example 2.
FIG. 3 is a schematic view of a rotor core structure of the screw compressor rotor shown in FIG. 1
FIG. 4 is a schematic diagram of a master mold structure.
FIG. 5 is a schematic view of the master mold placed in the mold box.
FIG. 6 is a schematic view showing a molten wax injected between the master mold and the inner wall of the molding box.
FIG. 7 is a schematic view of a wax pattern embedded in a rotor shaft core.
FIG. 8 is a schematic view showing the injection of liquid resin between the rotor shaft core and the inner wall of the wax pattern.
FIG. 9 is a schematic view of a combination of a wax pattern, a rotor core and a plastic layer.
Detailed Description
The present invention is further described in the following examples, which are intended to be illustrative only and not to be limiting as to the scope of the invention, which is to be given the full breadth of the appended claims and any and all equivalent modifications thereof which would occur to persons skilled in the art upon reading the present specification and which are intended to be within the scope of the present invention as defined in the appended claims.
Example 1, the rotor structure of the screw compressor to be produced in this example is shown in fig. 1, and includes a rotor shaft core 1 and a plastic layer 2 coated outside the rotor shaft core 1, and the plastic layer 2 forms a spiral outer shape of the rotor. As shown in fig. 3, the rotor shaft core 1 is composed of a plurality of spiral pieces 1 a. The specific manufacturing method of the screw compressor rotor comprises the following steps:
s1, manufacturing a female die 3 with the same appearance characteristics as the helical blade of the rotor of the screw compressor, as shown in FIG. 4;
s2, placing the master model 3 into the moulding box 4, injecting wax in a molten state between the master model 3 and the inner wall of the moulding box 4 by a wax injection machine 5 as shown in FIG. 5, standing, cooling and solidifying to form a wax model 6 as shown in FIG. 6;
s3, screwing the female die 3 out of the wax die 6, and screwing the rotor shaft core 1 into the wax die 6, as shown in FIG. 7;
s4, preparing liquid resin, namely stirring the bisphenol A epoxy resin, the polyamide and the powdered graphite for more than 30 minutes in an environment with the vacuum pressure of less than or equal to-0.09 MPa according to the mass ratio of 20: 4: 8. Injecting liquid resin between the rotor shaft core 1 and the inner wall of the wax mold 6 by using a resin injection machine 7, and standing the molding box for more than 12 hours in an environment of 20 ℃ as shown in figure 8 to ensure that the liquid resin is primarily cured to form a plastic layer 2 coated on the rotor shaft core 1;
s5, taking the wax mold 6, the rotor shaft core 1 and the plastic layer 2 out of the molding box 4 together, placing the mixture into a heating box as shown in figure 9, arranging a liquid wax collecting tray below a workpiece in the heating box, baking for 4 hours at 90 ℃ to completely melt the wax mold 6 and completely solidify the plastic layer 2 to obtain the screw compressor rotor, collecting the melted wax mold 6 by the liquid wax collecting tray, directly transferring the melted wax mold into a wax storage cylinder of a wax injection machine 5, omitting a wax melting process, continuously using the obtained liquid wax for molding the wax mold 6, reducing the processes and realizing good effect of recycling.
Example 2, the rotor structure of the screw compressor to be produced in this example is shown in fig. 2, and includes a rotor shaft core 10 and a plastic layer 20 coated outside the rotor shaft core 10, and the plastic layer 20 forms a spiral outer shape of the rotor. The rotor shaft core 10 is a round straight rod. The specific manufacturing method of the screw compressor rotor comprises the following steps:
s1, manufacturing a female die with the same appearance characteristics as the helical blade of the rotor of the screw compressor;
s2, placing the female die into a molding box, injecting wax in a molten state between the female die and the inner wall of the molding box, standing, cooling and solidifying to form a wax die;
s3, screwing the female die out of the wax mold, and inserting the rotor shaft core 10 into the wax mold;
s4, preparing liquid resin, namely stirring the bisphenol A epoxy resin, the polyamide and the powdered graphite for more than 30 minutes in an environment with the vacuum pressure of less than or equal to-0.09 MPa according to the mass ratio of 20: 5: 10. Injecting liquid resin between the rotor shaft core 10 and the inner wall of the wax mold, and standing the molding box in an environment of 30 ℃ for more than 12h to ensure that the liquid resin is primarily cured to form a plastic layer 20 coated on the rotor shaft core;
s5, taking the wax mould, the rotor shaft core 10 and the plastic layer 20 out of the molding box together, putting the wax mould, the rotor shaft core and the plastic layer 20 into a heating box, arranging a liquid wax collecting tray below a workpiece in the heating box, baking for 5 hours at 80 ℃ to completely melt the wax mould and completely solidify the plastic layer 20 to obtain the screw compressor rotor, collecting the melted wax mould by the liquid wax collecting tray, directly transferring the melted wax mould into a wax storage cylinder of a wax injection machine, omitting a wax melting process, continuously using the obtained liquid wax for molding the wax mould, reducing the working procedures and realizing good effect of recycling.
Example 3, the rotor structure of the screw compressor to be produced in this example is shown in fig. 1, and includes a rotor shaft core 1 and a plastic layer 2 coated outside the rotor shaft core 1, and the plastic layer 2 forms a spiral outer shape of the rotor. As shown in fig. 3, the rotor shaft core 1 is composed of a plurality of spiral pieces 1 a. The specific manufacturing method of the screw compressor rotor comprises the following steps:
s1, manufacturing a female die 3 with the same appearance characteristics as the helical blade of the rotor of the screw compressor, as shown in FIG. 4;
s2, placing the master model 3 into the moulding box 4, injecting wax in a molten state between the master model 3 and the inner wall of the moulding box 4 by a wax injection machine 5 as shown in FIG. 5, standing, cooling and solidifying to form a wax model 6 as shown in FIG. 6;
s3, screwing the female die 3 out of the wax die 6, and screwing the rotor shaft core 1 into the wax die 6, as shown in FIG. 7;
s4, preparing liquid resin, namely stirring the bisphenol A epoxy resin, the polyamide and the powdered graphite for more than 30 minutes in an environment with the vacuum pressure of less than or equal to-0.09 MPa according to the mass ratio of 20: 5: 8. Injecting liquid resin between the rotor shaft core 1 and the inner wall of the wax mold 6 by using a resin injection machine 7, and standing the molding box for more than 12 hours in an environment of 20 ℃ as shown in figure 8 to ensure that the liquid resin is primarily cured to form a plastic layer 2 coated on the rotor shaft core 1;
s5, taking the wax mold 6, the rotor shaft core 1 and the plastic layer 2 out of the molding box 4 together, placing the mixture into a heating box as shown in figure 9, arranging a liquid wax collecting tray below a workpiece in the heating box, baking for 4 hours at 100 ℃ to completely melt the wax mold 6 and completely solidify the plastic layer 2 to obtain the screw compressor rotor, collecting the melted wax mold 6 by the liquid wax collecting tray, directly transferring the melted wax mold into a wax storage cylinder of a wax injection machine 5, omitting a wax melting process, continuously using the obtained liquid wax for molding the wax mold 6, reducing the processes and realizing good effect of recycling.
Claims (5)
1. A method for producing a screw compressor rotor, characterized by comprising the steps of:
s1, manufacturing a female die with the same appearance characteristics as the helical blade of the rotor of the screw compressor;
s2, placing the female die into a molding box, injecting wax in a molten state between the female die and the inner wall of the molding box, standing, cooling and solidifying to form a wax die;
s3, screwing the female die out of the wax mold, and then putting the rotor shaft core into the wax mold;
s4, injecting liquid resin between the rotor shaft core and the inner wall of the wax mould, and forming a plastic layer coated on the rotor shaft core after the liquid resin is primarily cured; the liquid resin comprises bisphenol A epoxy resin, polyamide and a filler, wherein the mass ratio of the bisphenol A epoxy resin to the polyamide to the filler is 20: 4-5: 8-10;
and S5, taking the wax mold, the rotor shaft core and the plastic layer out of the molding box, heating to completely melt the wax mold and completely solidify the plastic layer to obtain the screw compressor rotor.
2. The method for producing a rotor for a screw compressor according to claim 1, wherein the step S4 is a step of preliminarily solidifying the liquid resin by leaving the molding box filled with the liquid resin at 20 to 40 ℃ for 12 hours or more.
3. The method for producing a rotor of a screw compressor according to claim 1, wherein the step S5 of heating to melt the wax pattern and completely solidify the plastic layer is heating at 80-100 ℃ for 4 hours or more.
4. The method for producing a rotor of a screw compressor according to claim 1, wherein the liquid resin in step S4 is injected after stirring for 30 minutes or more in an environment of a vacuum pressure of-0.09 MPa or less.
5. Method for producing a screw compressor rotor according to claim 1, characterised in that the filler is powdered graphite.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810775679.XA CN109177216B (en) | 2018-07-16 | 2018-07-16 | Production method of screw compressor rotor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810775679.XA CN109177216B (en) | 2018-07-16 | 2018-07-16 | Production method of screw compressor rotor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109177216A CN109177216A (en) | 2019-01-11 |
| CN109177216B true CN109177216B (en) | 2020-12-04 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810775679.XA Expired - Fee Related CN109177216B (en) | 2018-07-16 | 2018-07-16 | Production method of screw compressor rotor |
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| Country | Link |
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| CN (1) | CN109177216B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110103392A (en) * | 2019-03-25 | 2019-08-09 | 盐城华亚石油机械制造有限公司 | A kind of Holes of Complicated Wells special anti-corrosion abrasion-proof sucker rod centralizer processing technology |
| IT202100025589A1 (en) * | 2021-10-07 | 2023-04-07 | Tm I C S R L Termomeccanica Ind Compressors | SCREW COMPRESSOR. |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003314475A (en) * | 2002-04-25 | 2003-11-06 | Hitachi Industries Co Ltd | Screw rotor, screw compressor equipped with screw rotor, and method of manufacturing screw rotor |
| CN1562523A (en) * | 2004-04-12 | 2005-01-12 | 齐志威 | Mould castings method |
| CN105728650A (en) * | 2014-12-09 | 2016-07-06 | 重庆凌云工具有限公司 | Precision casting method |
-
2018
- 2018-07-16 CN CN201810775679.XA patent/CN109177216B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003314475A (en) * | 2002-04-25 | 2003-11-06 | Hitachi Industries Co Ltd | Screw rotor, screw compressor equipped with screw rotor, and method of manufacturing screw rotor |
| CN1562523A (en) * | 2004-04-12 | 2005-01-12 | 齐志威 | Mould castings method |
| CN105728650A (en) * | 2014-12-09 | 2016-07-06 | 重庆凌云工具有限公司 | Precision casting method |
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| Publication number | Publication date |
|---|---|
| CN109177216A (en) | 2019-01-11 |
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