CA2638236A1 - Method and machine for producing a rotor of an eccentric screw pump - Google Patents
Method and machine for producing a rotor of an eccentric screw pump Download PDFInfo
- Publication number
- CA2638236A1 CA2638236A1 CA 2638236 CA2638236A CA2638236A1 CA 2638236 A1 CA2638236 A1 CA 2638236A1 CA 2638236 CA2638236 CA 2638236 CA 2638236 A CA2638236 A CA 2638236A CA 2638236 A1 CA2638236 A1 CA 2638236A1
- Authority
- CA
- Canada
- Prior art keywords
- rotor
- machine
- head
- smoothing
- peeling
- 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.)
- Abandoned
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B39/00—Burnishing machines or devices, i.e. requiring pressure members for compacting the surface zone; Accessories therefor
- B24B39/04—Burnishing machines or devices, i.e. requiring pressure members for compacting the surface zone; Accessories therefor designed for working external surfaces of revolution
- B24B39/045—Burnishing machines or devices, i.e. requiring pressure members for compacting the surface zone; Accessories therefor designed for working external surfaces of revolution the working tool being composed of a plurality of working rolls or balls
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B5/00—Turning-machines or devices specially adapted for particular work; Accessories specially adapted therefor
- B23B5/08—Turning-machines or devices specially adapted for particular work; Accessories specially adapted therefor for turning axles, bars, rods, tubes, rolls, i.e. shaft-turning lathes, roll lathes; Centreless turning
- B23B5/12—Turning-machines or devices specially adapted for particular work; Accessories specially adapted therefor for turning axles, bars, rods, tubes, rolls, i.e. shaft-turning lathes, roll lathes; Centreless turning for peeling bars or tubes by making use of cutting bits arranged around the workpiece
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23G—THREAD CUTTING; WORKING OF SCREWS, BOLT HEADS, OR NUTS, IN CONJUNCTION THEREWITH
- B23G1/00—Thread cutting; Automatic machines specially designed therefor
- B23G1/32—Thread cutting; Automatic machines specially designed therefor by milling
- B23G1/34—Thread cutting; Automatic machines specially designed therefor by milling with a cutting bit moving in a closed path arranged eccentrically with respect to the axis of the rotating workpieces
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P23/00—Machines or arrangements of machines for performing specified combinations of different metal-working operations not covered by a single other subclass
- B23P23/04—Machines or arrangements of machines for performing specified combinations of different metal-working operations not covered by a single other subclass for both machining and other metal-working operations
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P9/00—Treating or finishing surfaces mechanically, with or without calibrating, primarily to resist wear or impact, e.g. smoothing or roughening turbine blades or bearings; Features of such surfaces not otherwise provided for, their treatment being unspecified
- B23P9/02—Treating or finishing by applying pressure, e.g. knurling
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B27/00—Other grinding machines or devices
- B24B27/003—Other grinding machines or devices using a tool turning around the work-piece
-
- 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
- F04C2/00—Rotary-piston machines or pumps
- F04C2/08—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
- F04C2/10—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of internal-axis type with the outer member having more teeth or tooth-equivalents, e.g. rollers, than the inner member
- F04C2/107—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of internal-axis type with the outer member having more teeth or tooth-equivalents, e.g. rollers, than the inner member with helical teeth
- F04C2/1071—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of internal-axis type with the outer member having more teeth or tooth-equivalents, e.g. rollers, than the inner member with helical teeth the inner and outer member having a different number of threads and one of the two being made of elastic materials, e.g. Moineau type
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B2270/00—Details of turning, boring or drilling machines, processes or tools not otherwise provided for
- B23B2270/26—Burnishing
-
- 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
- F04C2230/00—Manufacture
- F04C2230/10—Manufacture by removing material
-
- 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
- F04C2230/00—Manufacture
- F04C2230/20—Manufacture essentially without removing material
- F04C2230/26—Manufacture essentially without removing material by rolling
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Rotary Pumps (AREA)
- Details And Applications Of Rotary Liquid Pumps (AREA)
- Applications Or Details Of Rotary Compressors (AREA)
Abstract
The present invention relates to a method and a machine for producing a rotor of an eccentric screw pump, with which or in which the shape of the rotor is produced by a peeling process followed by a smoothing process of the surface. The object of the invention is to make the smoothing process less time-consuming and, in addition, more cost effective with this method or with this machine. This object is solved with a method in which the smoothing process is accomplished by smooth-rolling. The machine for carrying out the method has a machine bed (3) on which a peeling head (9) and a smoothing head (7) are arranged so as to be axially movable for processing the rotor (2).
Description
Method And Machine For Producing A Rotor Of An Eccentric Screw Pump The present invention relates to a method and a machine for producing a rotor of an eccentric screw pump according to the preamble of claim 1 and claim 2, respectively.
Rotors of eccentric screw pumps consist of a hard material, for example of case-hardened steel, and run in a stator lined with an elastomer. To obtain an effective seal between rotor and stator during operation and to minimize, wear, the surface of the rotor must be smooth.
Usually, after a metal-cutting shaping which generally takes place by a peeling process, a rotor is ground to its finished size by means of belt grinding and the surface is then fine-ground and optionally also polished. This production method is very time-consuming and cost-intensive.
DE 299 04 463 U1 describes a method in which, after a metal-cutting shaping to smooth its surface, the rotor is placed in a bed consisting of gliding abrasives arranged in a grinding emulsion.
The grinding process then takes place through the movement of the bed. A grinding process of this type is still costly and time-consuming.
DE 196 33 984 Al describes a method in which a metal-cutting shaping of the rotor is omitted. To be able to produce the rotor more inexpensively, master pattern or shaping techniques are used.
In this case, a blank of the rotor is produced by casting or drop-forging. As its surface is still very rough, it must be finished.
This is accomplished by drawing the rotor through a nozzle or pressing it through said nozzle. Consequently, the surface of the rotor is smoothed and its cross-sectional measurement simultaneously calibrated. Thus, in this case, the surface of the rotor is smoothed with aid of a shaping technique.
The object of the present invention is to provide a generic method and a machine with which the smoothing process can be carried out in a less time-consuming manner and, in addition, cost-effectively.
According to the invention, this object is solved with a method which has the features of claim 1 and with a machine according to claim 2.
Therefore, with the method according to the invention, the finishing of the surface of the rotor is accomplished by smooth rolling. The technology of smooth rolling for the finishing of surfaces has been part of the general prior art for a long time.
Despite the sufficiently known advantages associated therewith -slight peak-to-valley height and increase in hardness due to cold work-hardening - this technology has surprisingly not been used to date in the manufacture of a rotor for an eccentric screw pump.
Time can be saved by smooth-rolling in comparison to the finishing by grinding.
A machine for carrying out the method according to the invention is constructed similar to a turning machine. It has a machine bed on which a peeling head and a smoothing head are arranged so as to be axially movable. The peeling head and the smoothing head can thereby be arranged either on one or on separate carriages.
Furthermore, it is advantageous if the roll body of the smoothing head be acted upon by hydraulic cylinders in order to control the contact pressure.
Rotors of eccentric screw pumps consist of a hard material, for example of case-hardened steel, and run in a stator lined with an elastomer. To obtain an effective seal between rotor and stator during operation and to minimize, wear, the surface of the rotor must be smooth.
Usually, after a metal-cutting shaping which generally takes place by a peeling process, a rotor is ground to its finished size by means of belt grinding and the surface is then fine-ground and optionally also polished. This production method is very time-consuming and cost-intensive.
DE 299 04 463 U1 describes a method in which, after a metal-cutting shaping to smooth its surface, the rotor is placed in a bed consisting of gliding abrasives arranged in a grinding emulsion.
The grinding process then takes place through the movement of the bed. A grinding process of this type is still costly and time-consuming.
DE 196 33 984 Al describes a method in which a metal-cutting shaping of the rotor is omitted. To be able to produce the rotor more inexpensively, master pattern or shaping techniques are used.
In this case, a blank of the rotor is produced by casting or drop-forging. As its surface is still very rough, it must be finished.
This is accomplished by drawing the rotor through a nozzle or pressing it through said nozzle. Consequently, the surface of the rotor is smoothed and its cross-sectional measurement simultaneously calibrated. Thus, in this case, the surface of the rotor is smoothed with aid of a shaping technique.
The object of the present invention is to provide a generic method and a machine with which the smoothing process can be carried out in a less time-consuming manner and, in addition, cost-effectively.
According to the invention, this object is solved with a method which has the features of claim 1 and with a machine according to claim 2.
Therefore, with the method according to the invention, the finishing of the surface of the rotor is accomplished by smooth rolling. The technology of smooth rolling for the finishing of surfaces has been part of the general prior art for a long time.
Despite the sufficiently known advantages associated therewith -slight peak-to-valley height and increase in hardness due to cold work-hardening - this technology has surprisingly not been used to date in the manufacture of a rotor for an eccentric screw pump.
Time can be saved by smooth-rolling in comparison to the finishing by grinding.
A machine for carrying out the method according to the invention is constructed similar to a turning machine. It has a machine bed on which a peeling head and a smoothing head are arranged so as to be axially movable. The peeling head and the smoothing head can thereby be arranged either on one or on separate carriages.
Furthermore, it is advantageous if the roll body of the smoothing head be acted upon by hydraulic cylinders in order to control the contact pressure.
The invention will be described in greater detail in the following with reference to two embodiments. The attached drawings show:
Fig. 1 a perspective view on a machine for peeling and smooth-rolling a rotor of an eccentric screw pump according to a first embodiment, Fig. 2 a side view of a machine for peeling and smooth-rolling a rotor of an eccentric screw pump according to a second embodiment, Fig. 3 a side view of a smoothing head, and Fig. 4 a side view of a peeling head.
The machine 1 shown in the drawing for producing rotors 2 for eccentric screw pumps is constructed similar to a turning machine.
It has a bed 3 with two parallel guide rails 4 on which a tailstock 5, a carriage 15 (Fig. 1) or two carriages 6 and 8 (Fig. 2) for a smoothing head 7 and for a peeling head 9 are arranged so as to be longitudinally movable. The rotor 2 or its blank is clamped in a chuck 10 on its one end and supported on the tailstock 5 on its other end, which has a centering stock 11 for it which engages in a centre bore placed in the rotor 2 at the front end. Instead of the tailstock 5, a bush for the radial support of the rotor 2 can also be used. Steady rests can also be used.
The structure of the peeling head 9 and smoothing head 7 corresponds to the prior art. In the embodiments of the invention, the peeling head 9 has six peeling knives 12 which are each arranged at a distance of 60 from one another.
In this embodiment, three spherical roll bodies 13, which are each arranged at a distance of 1200 from one another, can be used in the smoothing head 7. The roll bodies 13 on the rotor 2 are positioned via hydraulic cylinders 14 which ensure a uniform and sufficient contact pressure of the roll bodies 13 on the surface of the rotor 2 (see arrow F in Fig. 3).
In the embodiment shown in Fig. 1, the peeling head 9 and smoothing head 7, as described above, are arranged on separate carriages 8 and 6, as a result of which they can be moved separately. To produce the rotor 2, the peeling head 9 is first moved from the tailstock 5 toward the chuck 10, as a result of which the exact contour of the rotor 2 is produced. The smoothing head 7 is then moved toward the chuck 10, as a result of which a smoothing of the surface of the rotor 2 is obtained. Once these two procedural steps have been completed, the peeling head 9 and smoothing head 7 are returned to their initial position.
In the embodiment according to Fig. 2, the peeling head 9 and smoothing head 7 are arranged on one carriage 15. Consequently, they can be moved together. The processing time of the rotor 2 can be further reduced by this arrangement in comparison to the first embodiment.
Fig. 1 a perspective view on a machine for peeling and smooth-rolling a rotor of an eccentric screw pump according to a first embodiment, Fig. 2 a side view of a machine for peeling and smooth-rolling a rotor of an eccentric screw pump according to a second embodiment, Fig. 3 a side view of a smoothing head, and Fig. 4 a side view of a peeling head.
The machine 1 shown in the drawing for producing rotors 2 for eccentric screw pumps is constructed similar to a turning machine.
It has a bed 3 with two parallel guide rails 4 on which a tailstock 5, a carriage 15 (Fig. 1) or two carriages 6 and 8 (Fig. 2) for a smoothing head 7 and for a peeling head 9 are arranged so as to be longitudinally movable. The rotor 2 or its blank is clamped in a chuck 10 on its one end and supported on the tailstock 5 on its other end, which has a centering stock 11 for it which engages in a centre bore placed in the rotor 2 at the front end. Instead of the tailstock 5, a bush for the radial support of the rotor 2 can also be used. Steady rests can also be used.
The structure of the peeling head 9 and smoothing head 7 corresponds to the prior art. In the embodiments of the invention, the peeling head 9 has six peeling knives 12 which are each arranged at a distance of 60 from one another.
In this embodiment, three spherical roll bodies 13, which are each arranged at a distance of 1200 from one another, can be used in the smoothing head 7. The roll bodies 13 on the rotor 2 are positioned via hydraulic cylinders 14 which ensure a uniform and sufficient contact pressure of the roll bodies 13 on the surface of the rotor 2 (see arrow F in Fig. 3).
In the embodiment shown in Fig. 1, the peeling head 9 and smoothing head 7, as described above, are arranged on separate carriages 8 and 6, as a result of which they can be moved separately. To produce the rotor 2, the peeling head 9 is first moved from the tailstock 5 toward the chuck 10, as a result of which the exact contour of the rotor 2 is produced. The smoothing head 7 is then moved toward the chuck 10, as a result of which a smoothing of the surface of the rotor 2 is obtained. Once these two procedural steps have been completed, the peeling head 9 and smoothing head 7 are returned to their initial position.
In the embodiment according to Fig. 2, the peeling head 9 and smoothing head 7 are arranged on one carriage 15. Consequently, they can be moved together. The processing time of the rotor 2 can be further reduced by this arrangement in comparison to the first embodiment.
Claims (5)
1. A method for producing a rotor of an eccentric screw pump in which the shape of the rotor is produced by a peeling process followed by a smoothing process of the surface, characterized in that the smoothing process is accomplished by smooth-rolling.
2. A machine for carrying out the method according to claim 1, having a machine bed (3) on which a peeling head (9) and a smoothing head (7) are arranged so as to be axially movable for processing the rotor (2).
3. The machine according to claim 2, characterized in that peeling head (9) and smoothing head (7) are arranged on one carriage (15).
4. The machine according to claim 2, characterized in that peeling head (9) and smoothing head (7) are arranged on separate carriages (6, 8).
5. The machine according to any one of the preceding claims 2 to 4, characterized in that the roll bodies (13) of the smoothing head (7) are acted upon by hydraulic cylinders (14).
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA 2638236 CA2638236A1 (en) | 2008-07-24 | 2008-07-24 | Method and machine for producing a rotor of an eccentric screw pump |
| EP09009584.5A EP2147746A3 (en) | 2008-07-24 | 2009-07-23 | Method and machine for producing a rotor of an eccentric screw pump |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA 2638236 CA2638236A1 (en) | 2008-07-24 | 2008-07-24 | Method and machine for producing a rotor of an eccentric screw pump |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2638236A1 true CA2638236A1 (en) | 2010-01-24 |
Family
ID=41203884
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2638236 Abandoned CA2638236A1 (en) | 2008-07-24 | 2008-07-24 | Method and machine for producing a rotor of an eccentric screw pump |
Country Status (2)
| Country | Link |
|---|---|
| EP (1) | EP2147746A3 (en) |
| CA (1) | CA2638236A1 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101862863A (en) * | 2010-06-23 | 2010-10-20 | 常州明豪新金属材料有限公司 | Sliding type aluminum rod surface scraping mechanism |
| CN104889461A (en) * | 2015-06-12 | 2015-09-09 | 徐平 | All-metal screw pump rotor milling method and device |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102010008694A1 (en) * | 2009-07-21 | 2011-02-10 | Ferroll Gmbh | Device for rolling an eccentric rotary component, rolling machine and method and eccentric rotary component |
| CN102152079B (en) * | 2011-03-31 | 2012-12-05 | 大庆油田有限责任公司 | Method for processing discharge-end small-interference screw pump rotor |
| CN103659149A (en) * | 2012-09-20 | 2014-03-26 | 昆山尚达智机械有限公司 | Novel bearing running in machine |
| CN105689957A (en) * | 2014-11-26 | 2016-06-22 | 自贡华西泵阀制造有限公司 | Novel valve rod cylindrical grinding equipment and valve rod cylindrical grinding method |
| CN107457458A (en) * | 2017-08-10 | 2017-12-12 | 安徽六方重联机械股份有限公司 | A kind of bolt removes silk instrument |
| CN112008098B (en) * | 2020-08-29 | 2021-08-03 | 苏州长齐精密机械有限公司 | Full-automatic numerical control turning system of dabber |
| CN114290137B (en) * | 2022-01-05 | 2022-11-15 | 浙江野牛工具有限公司 | Drill bit machining device |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE644268C (en) * | 1934-07-03 | 1937-04-28 | Ver Deutsche Metallwerke A G Z | Embossing device |
| FR2584008B1 (en) * | 1985-06-28 | 1988-10-28 | N Proizv Ob Tulatschermet | DEVICE FOR MACHINING CYLINDRICAL SURFACES OF PARTS OF THE SHAFT TYPE BY CUTTING AND HARDENING DEFORMATION |
| AT385226B (en) * | 1986-06-12 | 1988-03-10 | Kickuth Klaus | Machine tool for producing screw spindles or the like |
| DE19633984A1 (en) | 1996-08-22 | 1998-02-26 | Wilhelm Kaechele Gmbh Kautschu | Eccentric screw action pump |
| DE19851325C2 (en) * | 1998-10-12 | 2001-05-10 | Allweiler Ag | Method for producing a helical rotor and rotor for an eccentric screw pump |
-
2008
- 2008-07-24 CA CA 2638236 patent/CA2638236A1/en not_active Abandoned
-
2009
- 2009-07-23 EP EP09009584.5A patent/EP2147746A3/en not_active Withdrawn
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101862863A (en) * | 2010-06-23 | 2010-10-20 | 常州明豪新金属材料有限公司 | Sliding type aluminum rod surface scraping mechanism |
| CN101862863B (en) * | 2010-06-23 | 2012-05-30 | 常州明豪新金属材料有限公司 | Sliding type aluminum rod surface scraping mechanism |
| CN104889461A (en) * | 2015-06-12 | 2015-09-09 | 徐平 | All-metal screw pump rotor milling method and device |
Also Published As
| Publication number | Publication date |
|---|---|
| EP2147746A2 (en) | 2010-01-27 |
| EP2147746A3 (en) | 2013-06-19 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| FZDE | Dead |
Effective date: 20140724 |