WO2022122413A1 - Mobile werkzeugmaschine und verfahren - Google Patents
Mobile werkzeugmaschine und verfahren Download PDFInfo
- Publication number
- WO2022122413A1 WO2022122413A1 PCT/EP2021/083139 EP2021083139W WO2022122413A1 WO 2022122413 A1 WO2022122413 A1 WO 2022122413A1 EP 2021083139 W EP2021083139 W EP 2021083139W WO 2022122413 A1 WO2022122413 A1 WO 2022122413A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- machine tool
- mobile machine
- drive unit
- lubricant
- tool according
- Prior art date
Links
- 238000000034 method Methods 0.000 title claims abstract description 10
- 239000000314 lubricant Substances 0.000 claims abstract description 105
- 239000002131 composite material Substances 0.000 claims abstract description 17
- 238000010276 construction Methods 0.000 claims abstract description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 50
- 230000001050 lubricating effect Effects 0.000 claims description 29
- 239000000654 additive Substances 0.000 claims description 14
- 239000002245 particle Substances 0.000 claims description 14
- 230000000996 additive effect Effects 0.000 claims description 12
- 239000007787 solid Substances 0.000 claims description 11
- 239000010432 diamond Substances 0.000 claims description 8
- 229920000151 polyglycol Polymers 0.000 claims description 8
- 239000010695 polyglycol Substances 0.000 claims description 8
- 238000005260 corrosion Methods 0.000 claims description 7
- 229910003460 diamond Inorganic materials 0.000 claims description 6
- 238000005299 abrasion Methods 0.000 claims description 2
- 230000000845 anti-microbial effect Effects 0.000 claims description 2
- 239000007866 anti-wear additive Substances 0.000 claims description 2
- 239000004599 antimicrobial Substances 0.000 claims description 2
- 230000002401 inhibitory effect Effects 0.000 claims description 2
- 235000019592 roughness Nutrition 0.000 description 22
- 230000003746 surface roughness Effects 0.000 description 12
- 239000000463 material Substances 0.000 description 7
- 239000011248 coating agent Substances 0.000 description 6
- 238000000576 coating method Methods 0.000 description 6
- 229910000831 Steel Inorganic materials 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 5
- 239000010959 steel Substances 0.000 description 5
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 description 4
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 4
- 230000005540 biological transmission Effects 0.000 description 4
- 230000015572 biosynthetic process Effects 0.000 description 4
- 238000005755 formation reaction Methods 0.000 description 4
- 239000011521 glass Substances 0.000 description 4
- 239000002105 nanoparticle Substances 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000005498 polishing Methods 0.000 description 3
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 2
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- 229910052681 coesite Inorganic materials 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 229910052906 cristobalite Inorganic materials 0.000 description 2
- 238000005553 drilling Methods 0.000 description 2
- 230000002349 favourable effect Effects 0.000 description 2
- 238000009499 grossing Methods 0.000 description 2
- WGCNASOHLSPBMP-UHFFFAOYSA-N hydroxyacetaldehyde Natural products OCC=O WGCNASOHLSPBMP-UHFFFAOYSA-N 0.000 description 2
- 230000007774 longterm Effects 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 230000009347 mechanical transmission Effects 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 239000000377 silicon dioxide Substances 0.000 description 2
- 235000012239 silicon dioxide Nutrition 0.000 description 2
- 229910052682 stishovite Inorganic materials 0.000 description 2
- 229910052905 tridymite Inorganic materials 0.000 description 2
- 229910000838 Al alloy Inorganic materials 0.000 description 1
- 241000894006 Bacteria Species 0.000 description 1
- 241000195493 Cryptophyta Species 0.000 description 1
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 description 1
- 241000233866 Fungi Species 0.000 description 1
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 230000003115 biocidal effect Effects 0.000 description 1
- 238000009435 building construction Methods 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 239000011651 chromium Substances 0.000 description 1
- 239000000356 contaminant Substances 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000007710 freezing Methods 0.000 description 1
- 230000008014 freezing Effects 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 150000002334 glycols Chemical class 0.000 description 1
- 238000010191 image analysis Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000011065 in-situ storage Methods 0.000 description 1
- 238000005305 interferometry Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 229910052744 lithium Inorganic materials 0.000 description 1
- 238000005461 lubrication Methods 0.000 description 1
- 239000002932 luster Substances 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 229910001105 martensitic stainless steel Inorganic materials 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 239000011368 organic material Substances 0.000 description 1
- 238000009527 percussion Methods 0.000 description 1
- OFNHPGDEEMZPFG-UHFFFAOYSA-N phosphanylidynenickel Chemical compound [P].[Ni] OFNHPGDEEMZPFG-UHFFFAOYSA-N 0.000 description 1
- 229920001515 polyalkylene glycol Polymers 0.000 description 1
- 239000011343 solid material Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000004381 surface treatment Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25F—COMBINATION OR MULTI-PURPOSE TOOLS NOT OTHERWISE PROVIDED FOR; DETAILS OR COMPONENTS OF PORTABLE POWER-DRIVEN TOOLS NOT PARTICULARLY RELATED TO THE OPERATIONS PERFORMED AND NOT OTHERWISE PROVIDED FOR
- B25F5/00—Details or components of portable power-driven tools not particularly related to the operations performed and not otherwise provided for
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M107/00—Lubricating compositions characterised by the base-material being a macromolecular compound
- C10M107/20—Lubricating compositions characterised by the base-material being a macromolecular compound containing oxygen
- C10M107/30—Macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
- C10M107/32—Condensation polymers of aldehydes or ketones; Polyesters; Polyethers
- C10M107/34—Polyoxyalkylenes
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M173/00—Lubricating compositions containing more than 10% water
- C10M173/02—Lubricating compositions containing more than 10% water not containing mineral or fatty oils
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25D—PERCUSSIVE TOOLS
- B25D17/00—Details of, or accessories for, portable power-driven percussive tools
- B25D17/26—Lubricating
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25D—PERCUSSIVE TOOLS
- B25D2250/00—General details of portable percussive tools; Components used in portable percussive tools
- B25D2250/365—Use of seals
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M2201/00—Inorganic compounds or elements as ingredients in lubricant compositions
- C10M2201/02—Water
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M2209/00—Organic macromolecular compounds containing oxygen as ingredients in lubricant compositions
- C10M2209/10—Macromolecular compoundss obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
- C10M2209/103—Polyethers, i.e. containing di- or higher polyoxyalkylene groups
- C10M2209/105—Polyethers, i.e. containing di- or higher polyoxyalkylene groups of alkylene oxides containing three carbon atoms only
- C10M2209/1055—Polyethers, i.e. containing di- or higher polyoxyalkylene groups of alkylene oxides containing three carbon atoms only used as base material
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
- C10N2020/00—Specified physical or chemical properties or characteristics, i.e. function, of component of lubricating compositions
- C10N2020/01—Physico-chemical properties
- C10N2020/055—Particles related characteristics
- C10N2020/06—Particles of special shape or size
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
- C10N2030/00—Specified physical or chemical properties which is improved by the additive characterising the lubricating composition, e.g. multifunctional additives
- C10N2030/02—Pour-point; Viscosity index
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
- C10N2050/00—Form in which the lubricant is applied to the material being lubricated
- C10N2050/08—Solids
Definitions
- the invention relates to a mobile machine tool with a drive unit.
- the object of the present invention is therefore to offer a mobile machine tool and a method that allow a particularly energy-efficient and yet cost-effective use of a generic mobile machine tool.
- a mobile machine tool in particular a hand-held machine tool or a construction robot, for example for carrying out work in structural and/or civil engineering, with a drive unit, the drive unit having an aqueous lubricant and/or the drive unit being designed for operation with the water-based lubricant is set up, wherein before the start of a running-in phase of the drive unit, a composite roughness sigma of two interacting contact surfaces of the drive unit is greater than 0.01 pm.
- the invention is therefore based on the surprising finding that friction and subsequent fatigue damage can be remedied precisely by the fact that with an initially comparatively rough surface roughness, a particularly high-quality smoothing of the contact surfaces can be achieved by using a water-based lubricant, especially in the run-in phase of the drive unit.
- a water-based lubricant especially in the run-in phase of the drive unit.
- the lubricating film produced by the water-based lubricant can be comparatively thin.
- the thickness of the resulting lubricating film can be of the order of the bond roughness.
- boundary friction and/or mixed friction can thus be present as friction states in the drive unit, in particular in nominal operation of the drive unit. The wear caused by the operation of the drive unit can then lead to an automatic smoothing of the contact surfaces.
- At least one area of a surface, in particular an inner surface of the drive unit, which can come into contact with the aqueous lubricant can have a corrosion-resistant and/or anti-corrosion material.
- the at least one area can in particular have a coating
- Such a corrosion-resistant material for example for an area of a machine part of the drive unit, can include, for example, a martensitic stainless steel, for example X17CrNi16-2, X15Cr13 and/or X39CrMo17-1. It can also, for example for an area of a housing part of the drive unit, comprise an aluminum alloy, for example AlSi12Cu1 (Fe), Al Si9Cu3 (Fe) and/or Al Si7MgO.3.
- the coating can include an anodized, in particular hard-anodized, coating, for example for aluminum.
- anodized, in particular hard-anodized, coating for example for aluminum.
- it can also include a nickel coating, in particular a galvanic one, a nickel-phosphorus coating, in particular a chemical one, for steels and/or a coating obtained by nitrocarburizing and/or post-oxidizing.
- the composite roughness sigma can be understood as the root mean square of the surface roughness of the respectively interacting contact surfaces.
- a relative lubricating film thickness can be understood as meaning the relationship between a lubricating film thickness and a surface roughness, in particular the composite roughness sigma.
- the lubricating film thickness on a central lubricating film thickness is preferred.
- the relative lubricating film thickness can be less than one before the start of the running-in phase.
- the thickness of the lubricating film before the start of the running-in phase can be thinner than the surface roughness, in particular the composite roughness sigma.
- the relative lubricating film thickness can increase to values greater than one, for example to values of at least three.
- the lubricating film can be thicker, in particular significantly thicker, than the surface roughness, for example than the composite roughness sigma.
- the surface roughness can be significantly reduced.
- the composite roughness sigma can be at least halved, for example reduced to a tenth.
- the surface roughness can be measurable by means of a stylus method.
- the measurement can be carried out according to DIN EN ISO 4288.
- the surface parameters can be calculated according to DIN EN ISO 4287.
- Various surface parameters can be used to calculate the composite roughness sigma; the square mean value of profile ordinates Rq is preferably used to determine the composite roughness sigma.
- the bond roughness sigma can be understood in particular as the square root of the sum of the squared mean values of the profile ordinates Rq of the interacting contact surfaces.
- the aqueous lubricant can also provide sufficient scuffing load capacity, for example measured on an FZG gear wheel stress test bench.
- the lubricating film thickness can be measurable with an elastohydrodynamics (EHD) test stand, for example available from PCS Instruments, Great Britain.
- EHD elastohydrodynamics
- the lubricant by measuring the thickness of the lubricating film in a Contact area, especially a point contact, are checked.
- a steel ball can be loaded against a glass pane, preferably coated with a chromium and a SiO2 layer.
- the measurement can be based on optical interferometry.
- the contact area can be illuminated with white light, which is directed onto the contact through a microscope and a glass pane. Part of the light can be reflected by the chrome layer.
- Part of the light can penetrate the SiO2 layer and the lubricant film and be reflected by the steel ball.
- the light paths of the two parts of the light can be combined so that an interference pattern can be generated.
- the interference image can be guided into a spectrometer and/or an image recording device, for example a high-resolution black-and-white CCD camera, for recording an interference image.
- the interference image can be analyzed using evaluation software.
- the lubricating film thickness can be determined and/or can be determined by image analysis of the interference pattern.
- a load can be chosen between 30 N and 50 N.
- the temperature of the lubricant and/or the remaining material can be between 35°C and 45°C, in particular 40°C.
- a speed of the glass pane can be set in such a way that a relative speed of between 0.1 m/s and 3.5 m/s results.
- a surface roughness Ra of the steel ball can be 10 1 nm, in particular 10 nm.
- a surface roughness Ra of the glass pane can also be 10 1 nm, in particular 5 nm.
- the surface roughnesses Ra can preferably be mean roughness values.
- the bond roughness sigma is more than 0.01 pm.
- it can be in the range from 0.1 pm to 1 pm.
- the composite roughness sigma can be less than or equal to 0.01 ⁇ m after the running-in phase.
- the drive unit has the water-based lubricant and/or is set up for operation with the water-based lubricant.
- water- and/or water-vapour-resistant materials can preferably be used in the drive unit.
- at least one seal of the drive unit can be made of a water and/or water vapor resistant material.
- the drive unit can also have at least one dynamic seal, for example a labyrinth seal and/or a centrifugal seal.
- the mobile power tool can be a hand power tool, for example a drill, a chisel, a grinder, a saw or the like. It is also conceivable that the mobile machine tool is a construction robot or includes a construction robot.
- the mobile machine tool can have a manipulator, in particular a multi-axis manipulator.
- the mobile machine tool can have a drive device for driving a tool, for example a drill, a chisel, a suction device or the like.
- the mobile machine tool can be set up to machine concrete and/or metal. It can be designed for drilling, chiselling, sawing and/or grinding. In general, the mobile machine tool can be set up to carry out work in building construction and/or civil engineering. It is conceivable that it is not set up for use in mining.
- the mobile machine tool can be portable; for example, it can weigh less than 50 kg, in particular less than 25 kg.
- the mobile machine tool can also have a chassis and/or a flight platform, in particular if it is designed as a construction robot or includes one.
- the increase in energy efficiency that can be achieved according to the invention has a particularly favorable effect particularly in the case of airworthy mobile machine tools, for example in the form of unmanned flying objects such as drones that can be moved autonomously or semi-autonomously.
- the bond roughness is preferably also limited before the start of the running-in phase in order to facilitate operation of the mobile machine tool at the beginning and during the running-in phase as well.
- the bond roughness sigma before the start of the running-in phase of the drive unit can be at most 3 ⁇ m, preferably at most 1 ⁇ m.
- the water-based lubricant can be designed in such a way that the lubricating film thickness is between 10% and 80%, in particular between 30% and 60%, particularly preferably between 50% and 60%, of an anhydrous or at least essentially anhydrous polyglycol-based, preferably a kinematic viscosity of 80 mm 2 /s at 40°C having lubricant (as reference lubricant).
- an “essentially water-free lubricant” can be understood to mean a lubricant which, preferably at least immediately after production, contains at most 1%, particularly preferably at most 0.2%, of water.
- a lubricating film thickness range leads to the expectation that boundary friction and/or mixed friction will set in, at least temporarily and/or in certain areas within the drive unit.
- the lubricating film thickness of the water-based lubricant is preferably thicker than a lubricating film thickness that results when pure water is used as the lubricant, particularly during normal operation of the drive unit or the mobile machine tool.
- the reference lubricant can be biodegradable, that is, it can be an EAL lubricant (environmentally acceptable lubricant).
- the aqueous lubricant can also be biodegradable.
- the reference lubricant is not biodegradable. This can be the case in particular if the reference lubricant is based on polyglycol.
- the aqueous lubricant may contain at least 5%, preferably at least 15%, more preferably between 30% and 35%, especially 33% water.
- the water-based lubricant can have a significant proportion of water. This is particularly noteworthy, as otherwise the oil-based lubricants commonly used in mobile machine tools should be replaced after even small amounts of water have entered.
- the aqueous lubricant may contain at most 90%, preferably at most 70%, water.
- the lubricant can also contain at least one glycol, for example a polyglycol.
- the lubricant can contain one or more polyglycols in a proportion of at least 30%, preferably at least 40%. The proportion may not exceed 60%.
- the polyglycol can be a polyalkylene glycol.
- the glycol or glycols can form a second largest portion of the lubricant, especially after water.
- the water-based lubricant can also contain at least one additive, in particular one Anti-wear additive, an anti-corrosion additive and/or an antimicrobial, in particular growth-inhibiting, additive.
- the aqueous lubricant can be set up to suppress the formation of bacteria, fungi and/or algae. The aqueous lubricant can thus be set up to avoid the formation of biofilms.
- the anti-corrosion additive can in particular be and/or comprise a non-ferrous metal-deactivating additive. It is also conceivable that the water-based lubricant has at least one additive that reduces the coefficient of friction, a solid lubricant, an additive that improves the viscosity index and/or an additive that reduces the freezing point.
- the aqueous lubricant may also include a scuffing load-increasing additive.
- the aqueous lubricant can be a fully formulated lubricant.
- a general reduction in friction can be achieved if the water-based lubricant has a kinematic viscosity in the range of at most 320 mm 2 /s at 40 °C.
- the water-based lubricant can also have a kinematic viscosity of at least 30 mm 2 /s. In particular, it can have a, preferably significantly, higher kinematic viscosity than water.
- the machine tool in particular the drive unit, is set up so that the internal temperature of the drive unit is at most 80 °C, preferably at most 60 °C, when the mobile machine tool is in operation at an ambient temperature of 20 °C .
- This can be achieved, for example, in that the machine tool, in particular the drive unit, is regulated in terms of its input power when the maximum temperatures mentioned are reached. It is also conceivable to reduce the speeds of parts that move relative to one another and thus interacting contact surfaces that move relative to one another by constructive-geometric optimization in order to limit the resulting frictional heat already constructively.
- Another way of maintaining the specified maximum internal temperatures is to use a cooling system for the mobile machine tool to be dimensioned and / or regulated accordingly powerful.
- the maximum internal temperatures mentioned cannot be reached even during continuous operation and under full load.
- the machine tool can be set up to limit the input power of the drive unit in such a way that the internal temperature of the drive unit during operation of the mobile machine tool at an ambient temperature of 20° C. is at most 80° C., preferably at most 60° C. amounts to.
- the power loss occurring in the drive unit can be limited.
- the limitation can be such that the mechanical power output by the drive unit can remain the same despite the reduced input power or can even be increased compared to an input power that is not limited, in particular due to a disproportionately reduced power loss.
- the machine tool in particular the drive unit, has a solids filter, in particular a filter magnet, which is set up to remove particles, in particular abrasion, from the aqueous lubricant, as a result of which the service life of the aqueous lubricant can be significantly extended.
- the mobile machine tool in particular the drive unit, can have a lubricant filter.
- the aqueous lubricant can preferably be free of solids or at least essentially free of solids and/or without solid residues, at least before the start of the running-in phase.
- the water-based lubricant can be free of nanoparticles or other friction particles before the start of the running-in phase. It can thus be produced in a particularly cost-effective manner. Also, it can be biodegradable. In particular, it can be biologically harmless.
- the lubricant filter can also be designed in a particularly simple manner, since it was originally solids-free, water-based lubricant particles are classified as impurities and can accordingly be removed by the lubricant filter. The separation between contaminants and lubricant can thus take place by means of a simple separation of liquid versus solid material.
- the water-based lubricant contains nano-friction particles, in particular before the start of the running-in phase. This allows the nano-polishing effect to be further intensified, particularly at the start of the running-in phase.
- the nanofriction particles can be formed from at least one inorganic and/or from at least one organic material. They can be designed to dissolve and/or decompose in the course of operation of the mobile machine tool, for example during the running-in phase, so that the extent of the additional polishing effect can be limited.
- the water-based lubricant can contain nanoparticles, especially before the start of the running-in phase.
- the nanoparticles can be nanofriction particles or at least act as nanofriction particles.
- the nanoparticles can bring about a tribological effect in the drive unit.
- the mobile machine tool can particularly preferably be operated wirelessly.
- the mobile machine tool can have an energy store, in particular a rechargeable one.
- the rechargeable energy store can be an accumulator or a fuel cell.
- the mobile power tool can also be set up to drive a tool containing diamonds.
- the mobile machine tool can be set up to saw, drill and/or grind using the diamond-containing tool.
- high work rates are often required at the same time as long periods of use.
- the energy requirement for work typical for diamond-containing tools is therefore particularly high, so that avoiding power loss due to friction is particularly desirable.
- the scope of the invention also includes a method for the energy-efficient operation of a mobile machine tool according to the invention, wherein a drive unit of the mobile machine tool, in which, before the start of a run-in phase, a composite roughness sigma of two interacting contact surfaces of the drive unit is greater than 0.01 pm, with a water-based lubricant, especially in the running-in phase, is lubricated.
- the method according to the invention thus makes it possible to use the aqueous lubricant to form such a thin lubricant film that the two interacting contact surfaces are moved towards one another in the region of boundary friction and/or mixed friction.
- Particles can detach, for example from the initially rough contact surfaces, and act as friction particles.
- the interacting contact surfaces can thus automatically smooth themselves during the running-in phase. This allows friction to be reduced and the mobile machine tool to be operated in a particularly energy-efficient manner without the interacting contact surfaces having to be subjected to a particularly high-quality, usually very expensive, surface treatment in advance, particularly during the manufacture of the mobile machine tool.
- the mobile machine tool that is subjected to the method according to the invention, in particular its drive unit and the lubricant used in the drive unit, can have at least one of the features mentioned above in connection with the mobile machine tool and its components.
- Fig. 2 is a diagram of lubricating film thicknesses of different lubricants
- 3a to 3c show schematic representations of different friction states
- the invention generally includes mobile power tools and thus, for example, construction robots or hand power tools, the invention is explained using the example of a hand power tool solely to facilitate understanding.
- the hand power tool 10 is designed as a drill, in particular as a diamond drill. It can be operated wirelessly. For this purpose, it has a rechargeable accumulator 14 in the area of a housing 12 .
- the accumulator 14 has lithium.
- the handheld power tool 10 is designed as a portable device. It weighs between 0.5 and 15 kg and generally less than 25 kg.
- the hand-held power tool 10 also has a tool holder 16 .
- a tool 18 is accommodated in the tool holder 16 .
- the tool 18 is designed as a diamond drilling tool. It is therefore containing diamonds.
- the mobile machine tool it is conceivable for the mobile machine tool to be designed and/or usable as a hammer drill and/or as a chiselling machine.
- a drive unit 20 of the hand-held power tool 10 in FIG. 1 can also be seen in a schematic representation.
- the drive unit 20 is located within the housing 12 and is shown superimposed on the housing 12 for purposes of illustration only.
- the drive unit 20 drives a shaft to which in turn the tool holder 16 is coupled.
- the drive unit 20 has an electropneumatic striking mechanism and a rotary drive, which drive the shaft in a striking or rotating manner.
- the percussion mechanism and the rotary drive are mechanically connected via a transmission of the drive unit 20 to an electric motor of the drive unit 20 and can be driven by the latter.
- the drive unit 20 has a water-based lubricant that lubricates the transmission elements, for example gears, of the drive unit 20 .
- the drive unit 20 is water vapor resistant.
- all seals of the drive unit 20 that can come into contact with the aqueous lubricant are made of a water vapor-resistant material.
- the water-vapour-resistant material can preferably be temperature-resistant up to at least 120°C.
- the hand-held power tool 10 has a Cooling system, which is designed such that the internal temperature of the drive unit 20 during operation of the hand tool 10 at an ambient temperature of 20 ° C is at most 60 ° C.
- FIG. 2 shows a diagram of lubricating film thicknesses of different lubricants, the lubricating film thicknesses being normalized to 100% for an essentially water-free, polyglycol-based lubricant, identified in FIG. 2 as lubricant SO.
- the SO lubricant has a kinematic viscosity of 80 mm 2 /s at 40°C.
- water W is also shown schematically in the diagram.
- Lubricants S1, S2, S3, S4 and S5 are water-based lubricants that can be used according to the invention in the hand-held power tool 10 (FIG. 1). They have lubricating film thicknesses between 30% and approx. 60% of the lubricating film thickness of the essentially water-free lubricant SO, which serves as a reference. The lubricants have a kinematic viscosity of 100 mm 2 /s at 40°C.
- the lubricants S1, S2, S3, S4 and S5 each have a water content of between 30% and 35%. They also each contain at least between 40% and 60% polyglycols. Like the SO lubricant, they are fully formulated. All of the water-based lubricants S1 to S5 mentioned contain further additives, in particular biocidal, anti-corrosion, anti-wear, high-pressure and foam-controlling additives.
- the water-based lubricants S1 to S5 are formed without solid residues.
- the lubricants S1 , S2 , S3 , S4 and S5 have reduced lubricating film thicknesses compared to the lubricant SO serving as a reference, but these remain greater than that of the water W.
- Fig. 3a to 3c show different friction states of the drive unit 20 (Fig. 1) in schematic representations.
- the contact surfaces 22, 24 are shown in a greatly enlarged illustration as schematic sectional views.
- the contact surfaces 22, 24 can be, for example, areas of gear wheels of the drive unit 20 that mesh with one another.
- water-based lubricant 26 with different lubricating film thicknesses is located between the contact surfaces 22, 24.
- the water-based lubricant 26 can correspond to one of the lubricants S1, S2, S3, S4 or S5 (all FIG. 2).
- Contact surfaces 22, 24 is 0.1 pm, so tips 28, of which in Fig. 3a to 3c only some are marked by way of example and provided with reference symbols, the contact surfaces 22, 24 meet one another during a relative movement of the contact surfaces 22, 24.
- the average thickness of the lubricating film is less than the composite roughness sigma.
- the relative lubricating film thickness is therefore less than 1, for example between 0.1 and 0.4, in particular between 0.1 and 0.2 at a test temperature of 40° C. and a surface pressure of 1 GPa at 20% slip.
- the state according to FIG. 3a corresponds to a state of the hand-held power tool 10 (FIG. 1) directly in its production, i. H. before the start of a break-in period.
- the hand-held power tool 10 is operated during a run-in phase.
- the drive unit 20 is lubricated by the lubricant 26 contained in the drive unit 20 .
- the hand-held power tool can be operated, for example, over a period of 1 to 10 hours, for example 7 hours.
- 3b shows a state of friction in which mixed friction prevails between the contact surfaces 22, 24.
- the relative lubricating film thickness ranges between 1 and 3.
- This condition corresponds to an advanced stage of the running-in phase.
- 3c shows a state of friction in which pure fluid friction prevails between the contact surfaces 22, 24. This state corresponds to a state of the drive unit 20 after the run-in phase has ended.
- the composite roughness sigma of the contact surfaces 22, 24 has further reduced considerably.
- the surface formation of the contact surfaces 22, 24 is shown greatly exaggerated solely for reasons of illustration.
- the relative lubricating film thickness has increased to more than 3.
- 4a and 4b show microscopic images of areas of transmission parts after a long-term stress test has been completed.
- FIG. 4a shows the result for a mobile machine tool, the drive unit of which is lubricated with the essentially water-free lubricant SO, which serves as a reference
- the recordings according to FIG. 4b show this Result in a mobile machine tool whose drive unit is lubricated according to the invention with the water-based lubricant S3.
- FIG. 4a Significant pitting is evident in FIG. 4a, while FIG. 4b has remained almost free of pitting.
- FIGS. 5a and 5b show microscopic images of bearing balls after the long-term stress tests have been carried out.
- the upper figure, Fig. 5a shows the result for a drive unit, with the essentially water-free lubricant SO being used as the lubricant
- the lower figure, Fig. 5b shows the result for a drive unit in which the water-based lubricant S3 has been used.
- the water-based lubricant S3 is free of solids. In the tests associated with FIG. 5b, no nanofriction particles were added to the lubricant S3 either.
- the sump temperatures of the water-based lubricants could be kept below 60°C even with an electrical input power of the machine tool of 2.8 kW.
- the aqueous lubricant has a viscosity of between 40 and 50 mm 2 /s, in particular 46 mm 2 /s, at 40°C.
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Organic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Health & Medical Sciences (AREA)
- Emergency Medicine (AREA)
- Lubricants (AREA)
- Cleaning In General (AREA)
Abstract
Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US18/038,790 US20230405785A1 (en) | 2020-12-11 | 2021-11-26 | Mobile power tool and method |
CA3200706A CA3200706A1 (en) | 2020-12-11 | 2021-11-26 | Mobile power tool and method |
EP21820536.7A EP4259383A1 (de) | 2020-12-11 | 2021-11-26 | Mobile werkzeugmaschine und verfahren |
CN202180076925.2A CN116507705A (zh) | 2020-12-11 | 2021-11-26 | 移动式动力工具和方法 |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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EP20213304.7A EP4011561B1 (de) | 2020-12-11 | 2020-12-11 | Mobile werkzeugmaschine und verfahren |
EP20213304.7 | 2020-12-11 |
Publications (1)
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WO2022122413A1 true WO2022122413A1 (de) | 2022-06-16 |
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ID=73834200
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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PCT/EP2021/083139 WO2022122413A1 (de) | 2020-12-11 | 2021-11-26 | Mobile werkzeugmaschine und verfahren |
Country Status (5)
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US (1) | US20230405785A1 (de) |
EP (2) | EP4011561B1 (de) |
CN (1) | CN116507705A (de) |
CA (1) | CA3200706A1 (de) |
WO (1) | WO2022122413A1 (de) |
Families Citing this family (1)
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USD1034128S1 (en) * | 2022-02-07 | 2024-07-09 | Robert Bosch Gmbh | Hammer drill |
Citations (7)
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EP1070756A1 (de) * | 1999-07-21 | 2001-01-24 | Cognis Deutschland GmbH | Schwefelhaltige Schmierstoffe |
DE19934170A1 (de) * | 1999-07-21 | 2001-01-25 | Henkel Kgaa | Kühlschmierstoff und Kühlschmierstoffkonzentrat enthaltend feinteiligen elementaren Schwefel |
WO2001042672A1 (de) * | 1999-12-10 | 2001-06-14 | Sundwig Gmbh | Wälzlagerung für eine welle oder rolle und verfahren zur schmierung einer solchen wälzlagerung |
WO2007103497A2 (en) * | 2006-03-07 | 2007-09-13 | Ashland Licensing And Intellectual Property Llc | Gear oil composition containing nanomaterial |
EP2180214A1 (de) * | 2008-10-24 | 2010-04-28 | Makita Corporation | Dichtungsvorrichtung für Getriebegehäuse |
WO2012029191A1 (en) * | 2010-09-03 | 2012-03-08 | Nanocarbon Research Institute, Ltd. | Nanospacer lubrication |
DE202012100435U1 (de) * | 2011-02-13 | 2012-05-08 | Chervon (Hk) Ltd. | Kraftwerkzeug |
Family Cites Families (7)
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JPS6043278B2 (ja) * | 1977-02-04 | 1985-09-27 | 芝浦メカトロニクス株式会社 | ハンマドリル |
US5927910A (en) * | 1996-09-05 | 1999-07-27 | Fix, Jr.; John William | Automated drilling apparatus |
US8047302B2 (en) * | 2001-12-21 | 2011-11-01 | Wacker Neuson Produktion GmbH & Co. KG | Drilling and/or striking hammer with a lubricating device |
DE102006000469A1 (de) * | 2006-09-20 | 2008-04-03 | Hilti Ag | Wellenlagerdichtung |
JP5556542B2 (ja) * | 2010-09-29 | 2014-07-23 | 日立工機株式会社 | 電動工具 |
RU2012140965A (ru) * | 2011-10-04 | 2014-03-27 | Макита Корпорейшн | Электроинструмент (варианты) |
EP2811106B1 (de) * | 2013-06-07 | 2018-08-01 | Sandvik Mining and Construction Oy | Gesteinsbohrmaschine und Verfahren zur Schmierung |
-
2020
- 2020-12-11 EP EP20213304.7A patent/EP4011561B1/de active Active
-
2021
- 2021-11-26 EP EP21820536.7A patent/EP4259383A1/de not_active Withdrawn
- 2021-11-26 CN CN202180076925.2A patent/CN116507705A/zh active Pending
- 2021-11-26 US US18/038,790 patent/US20230405785A1/en active Pending
- 2021-11-26 CA CA3200706A patent/CA3200706A1/en active Pending
- 2021-11-26 WO PCT/EP2021/083139 patent/WO2022122413A1/de active Application Filing
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EP1070756A1 (de) * | 1999-07-21 | 2001-01-24 | Cognis Deutschland GmbH | Schwefelhaltige Schmierstoffe |
DE19934170A1 (de) * | 1999-07-21 | 2001-01-25 | Henkel Kgaa | Kühlschmierstoff und Kühlschmierstoffkonzentrat enthaltend feinteiligen elementaren Schwefel |
WO2001042672A1 (de) * | 1999-12-10 | 2001-06-14 | Sundwig Gmbh | Wälzlagerung für eine welle oder rolle und verfahren zur schmierung einer solchen wälzlagerung |
WO2007103497A2 (en) * | 2006-03-07 | 2007-09-13 | Ashland Licensing And Intellectual Property Llc | Gear oil composition containing nanomaterial |
EP2180214A1 (de) * | 2008-10-24 | 2010-04-28 | Makita Corporation | Dichtungsvorrichtung für Getriebegehäuse |
WO2012029191A1 (en) * | 2010-09-03 | 2012-03-08 | Nanocarbon Research Institute, Ltd. | Nanospacer lubrication |
DE202012100435U1 (de) * | 2011-02-13 | 2012-05-08 | Chervon (Hk) Ltd. | Kraftwerkzeug |
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Also Published As
Publication number | Publication date |
---|---|
CN116507705A (zh) | 2023-07-28 |
EP4011561A1 (de) | 2022-06-15 |
EP4011561B1 (de) | 2024-04-10 |
CA3200706A1 (en) | 2022-06-16 |
EP4259383A1 (de) | 2023-10-18 |
US20230405785A1 (en) | 2023-12-21 |
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