WO2022228998A1 - Threaded mechanism having a wiping element, and injection molding machine comprising same - Google Patents
Threaded mechanism having a wiping element, and injection molding machine comprising same Download PDFInfo
- Publication number
- WO2022228998A1 WO2022228998A1 PCT/EP2022/060572 EP2022060572W WO2022228998A1 WO 2022228998 A1 WO2022228998 A1 WO 2022228998A1 EP 2022060572 W EP2022060572 W EP 2022060572W WO 2022228998 A1 WO2022228998 A1 WO 2022228998A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- screw drive
- stripping element
- lubricant
- spindle
- threaded spindle
- Prior art date
Links
- 238000001746 injection moulding Methods 0.000 title claims abstract description 19
- 239000000314 lubricant Substances 0.000 claims abstract description 47
- 238000007790 scraping Methods 0.000 claims description 15
- 238000011161 development Methods 0.000 description 8
- 230000018109 developmental process Effects 0.000 description 8
- 238000009825 accumulation Methods 0.000 description 5
- 230000035508 accumulation Effects 0.000 description 5
- 230000000903 blocking effect Effects 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 238000009304 pastoral farming Methods 0.000 description 4
- 238000007789 sealing Methods 0.000 description 4
- 230000015572 biosynthetic process Effects 0.000 description 3
- 238000009420 retrofitting Methods 0.000 description 3
- 238000011109 contamination Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000001133 acceleration Effects 0.000 description 1
- 230000001154 acute effect Effects 0.000 description 1
- 238000004873 anchoring Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 239000004519 grease Substances 0.000 description 1
- 230000020169 heat generation Effects 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 238000005461 lubrication Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H25/00—Gearings comprising primarily only cams, cam-followers and screw-and-nut mechanisms
- F16H25/18—Gearings comprising primarily only cams, cam-followers and screw-and-nut mechanisms for conveying or interconverting oscillating or reciprocating motions
- F16H25/20—Screw mechanisms
- F16H25/24—Elements essential to such mechanisms, e.g. screws, nuts
- F16H25/2418—Screw seals, wipers, scrapers or the like
-
- 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
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
-
- 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
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/64—Mould opening, closing or clamping devices
-
- 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
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/83—Lubricating means
-
- 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
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/83—Lubricating means
- B29C2045/835—Lubricating means for ball screws or ball nuts
Definitions
- the invention relates to a screw drive with a stripping element, in particular for use in injection molding machines.
- the invention is based on the problem that a layer of grease forms on the threaded spindle due to the lubrication of the threaded drive in the spindle nut.
- a layer of grease forms on the threaded spindle due to the lubrication of the threaded drive in the spindle nut.
- the lubricant is detached from the threaded spindle due to the centrifugal force that occurs.
- this leads to contamination of the surrounding area.
- the screw drives for the ejector plate of an injection molding machine this can lead to contamination of the operator and the work area. The work area must therefore be cleaned regularly.
- a stripper for roller screw drives is known.
- the wiper which is preferably made of plastic, is arranged radially around the ball spindle, is fastened to the spindle nut and is pressed against the ball spindle by means of a spring.
- the wiper forms the thread profile of the threaded spindle and is in frictional contact with the threaded spindle.
- such a frictional connection between the wiper and the threaded spindle is disadvantageous, since the spring load generates a not inconsiderable amount of frictional heat. This frictional heat can lead to heat-related blocking of the screw drive when used in quick succession.
- the object of the invention is to improve a screw drive in such a way that the formation of an excessive accumulation of lubricant and thus the detachment of this accumulation at high speeds is prevented without heat-related blocking of the screw drive can occur.
- the subject matter of the invention comprises a threaded spindle, a spindle nut and a scraping element for lubricant,
- the stripping element has at least one stripping edge
- the at least one scraping edge is arranged at a distance from the threaded spindle by a lubricant gap.
- the non-contact arrangement of the stripping element also reduces wear and tear and the risk of damage to the stripping element minimized. This significantly increases the service life of the wiper element.
- the lubricant gap between the scraping edge and the threaded spindle del is to be selected in the screw drive according to the invention in such a way that at kei ner provided in the application speed of the threaded spindle contact of the stripping element with the threaded spindle occurs. If the scraper element is made of a more flexible material, such as rubber, then the minimum dimension for the lubricant gap should be larger than with a scraper element made of a stiff material, such as steel.
- the maximum dimension of the lubricant gap is to be selected in such a way that the formation of a lubricant layer, which would be thrown off by the centrifugal force, is prevented.
- the maximum size of the lubricant gap is to be selected depending on the intended speed of the screw drive in the application and on the surface tension of the lubricant used.
- the optimum size for the lubricant gap depends on many factors, such as the intended speed of the screw drive in the application, the surface tension of the lubricant, the dimensional accuracy of the threaded rod and the material of the wiper element, the optimum size for the respective application can be determined using suitable test setups .
- the stripping element can have a plurality of stripping edges.
- the at least one stripping edge of the stripping element can run along a straight line or along an arc of a circle.
- the at least one stripping edge can also include thread impressions, which partially engage in the threads without touching the threaded spindle. Such thread impressions can also be used to wipe off any lubricant that has accumulated in the threads.
- the at least one stripping edge can in particular run along a fixed geometric line as long as this line does not touch and/or intersect the threaded spindle.
- the length of the at least one stripping edge can be freely selected.
- the at least one scraping edge preferably extends over at least one thread turn and at least one thread web of the threaded spindle.
- the wiper element according to the invention is preferably used in the case of non-rotating rotating nuts.
- the stripping element according to the invention can be used with rotation-resistant threaded spindles, in which case it would have to be ensured that the stripping element is mounted in a rotationally fixed manner and is simultaneously moved with the order nut together in the axial direction of the threaded spindle.
- the scraping element preferably has at least one drainage surface through which the lubricant which has been scraped off is drained off in a targeted manner.
- the lubricant can be discharged here, for example by dripping down in the direction of the machine bed, which can include a drip tray, for example.
- a drainage system in the form of a hose or a pipe can also be connected to the drainage area.
- the drainage system can, for example, be a suction device of the wiped off lubricant.
- the drainage surface ensures that the lubricant is drained away in a targeted manner.
- the stripping element preferably has two drainage surfaces on opposite sides of the stripping element, as a result of which the lubricant can be drained off in a targeted manner through at least one drainage surface in both directions of rotation of the threaded spindle.
- the stripping element is arranged either on the spindle nut or on the enclosing component. This ensures that the wiper element is wiped off a film of lubricant immediately after it emerges from the rotating nut.
- the stripping element runs with the rotating nut or the enclosing component and thus effectively covers the entire threaded spindle without requiring a separate drive for the stripping element.
- the stripping element can be glued, riveted, welded or made in one piece with the spindle nut or the enclosing component.
- the stripping element is advantageously detachably connected to the spindle nut or the enclosing component.
- the stripping element can be screwed on, attached by means of a positive plug connection, fastened by means of a snap connection, fastened magnetically or clamped by means of a clamping ring.
- a detachable connection of the wiping element with the spindle nut or the enclosing component allows for easy retrofitting of existing systems and easy removal of the Ab wiping element in case of damage, wear or heavy soiling.
- the stripping element is preferably connected to the spindle nut or to the enclosing component via a prestressing force, in particular in the form of a clamping ring.
- the stripping element can be connected to the spindle nut or the enclosing component by means of a magnetic connection, a screw connection, a snap connection or a pin connection.
- the clamping ring encloses the spindle nut only partially or it only partially encircles a recess in the enclosing component.
- the clamping ring can be easily attached to the spindle nut or the enclosing component and removed again by expanding or contracting. This is even possible without removing the entire spindle nut, e.g. also in the form of a complete ball screw if it is not possible to thread on a ring-shaped closed wiper, which is the case if the ends of the ball screw are not freely accessible.
- Such a design of the clamping ring thus offers clear advantages over anchoring using a press fit of the clamping ring, which can result in damage during assembly and disassembly.
- the width of the lubricant gap is between 1 ⁇ m and 2 mm.
- the width here describes the distance between the stripping element and the threaded spindle.
- the stripping element is designed as a single lip, as a wrong V-shaped double lip or as a blunt edge.
- At least the stripping edge of the stripping element runs parallel to a respective curve on the envelope of the threaded spindle.
- the scraping edge therefore runs along a curve which runs parallel to a curve on the envelope of the threaded spindle.
- the parallelism is given in particular in three-dimensional space.
- the curve on the envelope of the threaded spindle can preferably run parallel to the axis of the threaded spindle or spirally on the envelope of the threaded spindle. In particular, any curve in the form of a continuous line is conceivable. If the stripping element has a plurality of stripping edges, one stripping edge runs parallel to each egg ner other curve on the envelope of the threaded spindle.
- from the grazing edge is angled, preferably arranged at right angles to the threaded spindle surface.
- the angle here is formed between an extended straight line, viewed from the threaded spindle, extending partially radially along the outer surface of the scraping edge and the surface of the threaded spindle.
- a three-dimensional wiper edge forms two angles with the threaded spindle surface.
- the two angles are preferably equal in magnitude, with tolerance deviations being negligible.
- the two angles can be different in order to have different stripping properties for different directions of rotation.
- the arrangement of the scraper edge enables an optimal scraping effect to be achieved.
- the angle to be selected between the scraper edge and the surface of the threaded spindle depends on the number, design and arrangement of the cutting edges. In the case of a single lip, for example, a vertical arrangement of the scraper edge is ideal in order to achieve the same scraping effect in both directions of rotation of the threaded spindle. Acute angles are preferred for U- or V-shaped double lips.
- the stripping element can partially enclose the envelope of the threaded spindle.
- a partial enclosure is particularly advantageous in the case of U-shaped or V-shaped double lips. Due to the partial gripping, optimal wiping conditions can be created for the respective wiping edges for both directions of rotation of the threaded spindle.
- the stripping element is arranged outside the housing of the spindle nut.
- the stripping element is arranged outside of a sealing area of a spindle nut.
- the scraping edge is thereby arranged outside of the spindle nut.
- the stripping element can be easily replaced in the event of damage or wear, without having to disassemble a spindle nut or the spindle as a whole.
- no complex modifications of a sealing element are necessary due to the integration of a stripping element in the sealing element. Such an integrated stripping element could then also only be exchanged by exchanging the entire sealing element.
- the invention relates to an injection molding machine with a threaded drive according to the invention discussed above.
- FIG. 1 is a perspective view of a screw drive on an ejector plate of an injection molding machine, with the stripping element being attached to the spindle nut with a clamping ring,
- Fig. 3 is a perspective view of an ejector plate
- FIG. 4 is a front view of the ejector plate with a clamped stripping element
- FIG. 1 an ejector plate 1 of an injection molding machine, not shown, is shown with a screw drive 2 ne.
- the screw drive 2 comprises a threaded spindle 3 and a spindle nut 4.
- the threaded spindle 3 is arranged in a recess 5 of the ejector plate 1.
- a further spindle nut 4 is arranged in the second recess 6 of the ejector plate 1.
- Guide rods (not shown) are arranged in the two bores 7 of the ejector plate 1 .
- the spindle nuts 4 are arranged in the ejector plate 1 in a rotationally fixed manner.
- the housing of the spindle nut 4 protrudes from the ejector plate 1.
- a clamping ring 8 is arranged on the protruding section of the spindle nut 4 .
- the clamping ring 8 comprises a stripping element 9 which is connected to the clamping ring 8 by means of a material-locking connection.
- the stripping element 9 is outside of the spindle nut 4 is arranged.
- the clamping ring 8 is in this case clamped by mechanical prestressing force on the spindle nut 4 and encloses the spindle nut 4 partially.
- the mechanical prestressing force is so great that it cannot be overcome by the acceleration forces occurring during operation of the injection molding machine. As can be seen from FIG.
- the stripping element 9 is arranged spaced apart from the threaded spindle 3 by a lubricant gap 10 when the clamping ring 8 is mounted.
- the lubricant gap 10 is selected in such a way that contact between the stripping element 9 and the threaded spindle 3 is ruled out. As a result, the friction-related wear and damage to the stripping element 9 is avoided and the development of frictional heat is prevented.
- the stripping element 9 comprises two stripping edges 11, two drainage surfaces 12 and a drip tip 13.
- the drip tip 13 points straight down towards the machine bed.
- the lubricant, not shown, on the threaded spindle 3 is at least partially stripped from the grazing edges 11 .
- the stripped lubricant then runs due to its inertia and gravity over the drain surfaces 12 in the direction of the drip tip 13. After reaching the drip tip 13, the stripped lubricant drips off in a targeted manner in the direction of a machine bed, not shown.
- the drip tip 13 can be rotated by 90° clockwise or counterclockwise, for example, so that it points to the side. In this way, dripping is made possible, in which case the wiped-off lubricant does not drip onto the guide rods, which are not shown.
- the drip tip 13 may be arranged radially in any direction.
- FIG. 3 and 4 an alternative embodiment of the subject of the invention is shown.
- the ejector plate 1 is designed so deep that the spindle nut is completely countersunk in the ejector plate 1 .
- the ejector plate 1 is also designed so deep that both in the recess 5 and in the second recess 6 next to the spindle nut 4, a clamping ring 8 'can be arranged.
- the clamping ring 8 ' is designed in such a way that its prestressing force acts radially outwards. The clamping ring 8 ' runs around the recess of the ejector plate 1 only partially.
- the alternative clamping ring 8 ' also includes a stripping element 9.
- the stripping element 9 is also arranged outside of the spindle nut 4 here.
- the stripping element 9 comprises parallel to the first exemplary embodiment two stripping edges 11, two drainage surfaces 12 and a drip tip 13.
- the drip tip 13 is arranged downwards in the direction of the machine bed. In this variant, too, the drip tip can be arranged in any radial direction.
- the stripping element 9 is spaced from the threaded spindle 3 in such a way that a lubricant gap 10 is formed.
- the lubricant gap 10 is selected in such a way that the scraping element 9 cannot come into contact with the threaded spindle 3 and the lubricant (not shown) is at least partially scraped off by the scraping edges 11 .
- the pretensioning force of the clamping ring 8 ' is selected in such a way that, during normal operation of the injection molding machine, it cannot become detached from the ejector plate 1 by the accelerating forces that arise.
- an extended straight line which runs in the plane shown along the drainage surfaces 12 forms a grazing angle (not shown) from the lateral surface of the threaded spindle 3.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- General Engineering & Computer Science (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
Abstract
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE112022002347.3T DE112022002347A5 (en) | 2021-04-27 | 2022-04-21 | Screw drive with stripping element |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102021204188.4 | 2021-04-27 | ||
DE102021204188.4A DE102021204188A1 (en) | 2021-04-27 | 2021-04-27 | Screw drive with wiper element |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2022228998A1 true WO2022228998A1 (en) | 2022-11-03 |
Family
ID=81750727
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP2022/060572 WO2022228998A1 (en) | 2021-04-27 | 2022-04-21 | Threaded mechanism having a wiping element, and injection molding machine comprising same |
Country Status (2)
Country | Link |
---|---|
DE (2) | DE102021204188A1 (en) |
WO (1) | WO2022228998A1 (en) |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DD252994A1 (en) | 1986-10-02 | 1988-01-06 | Grossdrehmaschbau 8 Mai Veb | SPREADER FOR ROLLER SCREW DRIVE |
JP2003083418A (en) * | 2001-09-10 | 2003-03-19 | Nsk Ltd | Ball screw device |
DE102006014359A1 (en) * | 2006-03-28 | 2007-10-11 | Hiwin Technologies Corp. | Gap-adjustable scraper is arranged as circular shaped, flexible element and its outer diameter is slightly larger than internal annular groove of screw nut |
DE102010051766A1 (en) * | 2009-11-23 | 2011-05-26 | Engel Austria Gmbh | Spindle drive for injection molding machine, has lubrication oil seal that limits lubrication area and lies at spindle, where lubrication oil seal is placed at end of lubrication area |
US20120060631A1 (en) * | 2010-09-10 | 2012-03-15 | Precision Motion Industries, Inc. | Two-lip dust-proof wiper of a ball screw |
DE102014103141B3 (en) * | 2014-03-10 | 2015-05-21 | Hiwin Technologies Corp. | Ball screw with scrapers |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR100626762B1 (en) | 1999-11-08 | 2006-09-22 | 티에이치케이 컴퍼니 리미티드 | Ball screw |
DE102007028579A1 (en) | 2006-07-11 | 2008-01-17 | Eitec Führungsbahnschutz-Systeme Gmbh | stem seal |
JP6252136B2 (en) | 2013-11-28 | 2017-12-27 | 日本精工株式会社 | Ball screw |
DE102016209036A1 (en) | 2016-05-24 | 2017-12-14 | Zf Friedrichshafen Ag | Spindle drive and actuator with spindle drive |
-
2021
- 2021-04-27 DE DE102021204188.4A patent/DE102021204188A1/en not_active Withdrawn
-
2022
- 2022-04-21 WO PCT/EP2022/060572 patent/WO2022228998A1/en active Application Filing
- 2022-04-21 DE DE112022002347.3T patent/DE112022002347A5/en active Pending
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DD252994A1 (en) | 1986-10-02 | 1988-01-06 | Grossdrehmaschbau 8 Mai Veb | SPREADER FOR ROLLER SCREW DRIVE |
JP2003083418A (en) * | 2001-09-10 | 2003-03-19 | Nsk Ltd | Ball screw device |
DE102006014359A1 (en) * | 2006-03-28 | 2007-10-11 | Hiwin Technologies Corp. | Gap-adjustable scraper is arranged as circular shaped, flexible element and its outer diameter is slightly larger than internal annular groove of screw nut |
DE102010051766A1 (en) * | 2009-11-23 | 2011-05-26 | Engel Austria Gmbh | Spindle drive for injection molding machine, has lubrication oil seal that limits lubrication area and lies at spindle, where lubrication oil seal is placed at end of lubrication area |
US20120060631A1 (en) * | 2010-09-10 | 2012-03-15 | Precision Motion Industries, Inc. | Two-lip dust-proof wiper of a ball screw |
DE102014103141B3 (en) * | 2014-03-10 | 2015-05-21 | Hiwin Technologies Corp. | Ball screw with scrapers |
Also Published As
Publication number | Publication date |
---|---|
DE112022002347A5 (en) | 2024-02-15 |
DE102021204188A1 (en) | 2022-10-27 |
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