WO2014125534A1 - ボールねじ用樹脂ナット及びその製造方法 - Google Patents
ボールねじ用樹脂ナット及びその製造方法 Download PDFInfo
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- WO2014125534A1 WO2014125534A1 PCT/JP2013/006759 JP2013006759W WO2014125534A1 WO 2014125534 A1 WO2014125534 A1 WO 2014125534A1 JP 2013006759 W JP2013006759 W JP 2013006759W WO 2014125534 A1 WO2014125534 A1 WO 2014125534A1
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- Prior art keywords
- layer
- groove
- fiber material
- resin
- fiber
- Prior art date
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- 229920005989 resin Polymers 0.000 title claims abstract description 110
- 239000011347 resin Substances 0.000 title claims abstract description 110
- 238000004519 manufacturing process Methods 0.000 title claims description 20
- 239000002657 fibrous material Substances 0.000 claims abstract description 97
- 239000011159 matrix material Substances 0.000 claims abstract description 32
- 238000001746 injection moulding Methods 0.000 claims abstract description 22
- 239000010410 layer Substances 0.000 claims description 125
- 239000000835 fiber Substances 0.000 claims description 60
- 239000012792 core layer Substances 0.000 claims description 46
- 239000012779 reinforcing material Substances 0.000 claims description 9
- 238000000465 moulding Methods 0.000 claims description 5
- 238000005096 rolling process Methods 0.000 description 38
- 239000004734 Polyphenylene sulfide Substances 0.000 description 10
- 229920000069 polyphenylene sulfide Polymers 0.000 description 10
- 238000000034 method Methods 0.000 description 9
- 238000005520 cutting process Methods 0.000 description 7
- 239000000463 material Substances 0.000 description 7
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 6
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 description 6
- 238000002347 injection Methods 0.000 description 6
- 239000007924 injection Substances 0.000 description 6
- 230000002093 peripheral effect Effects 0.000 description 6
- 239000011800 void material Substances 0.000 description 6
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 3
- 229920000049 Carbon (fiber) Polymers 0.000 description 3
- 239000004952 Polyamide Substances 0.000 description 3
- 229910052581 Si3N4 Inorganic materials 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 3
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 3
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 3
- 229920006231 aramid fiber Polymers 0.000 description 3
- 229910052796 boron Inorganic materials 0.000 description 3
- 239000004917 carbon fiber Substances 0.000 description 3
- 229920006351 engineering plastic Polymers 0.000 description 3
- 239000003365 glass fiber Substances 0.000 description 3
- 229910002804 graphite Inorganic materials 0.000 description 3
- 239000010439 graphite Substances 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 3
- 229920002647 polyamide Polymers 0.000 description 3
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 description 3
- 229910010271 silicon carbide Inorganic materials 0.000 description 3
- 239000000377 silicon dioxide Substances 0.000 description 3
- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 description 3
- 239000010959 steel Substances 0.000 description 3
- 239000010936 titanium Substances 0.000 description 3
- 229910052719 titanium Inorganic materials 0.000 description 3
- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 description 3
- 239000011787 zinc oxide Substances 0.000 description 3
- 238000001000 micrograph Methods 0.000 description 2
- 229920006324 polyoxymethylene Polymers 0.000 description 2
- 229910001220 stainless steel Inorganic materials 0.000 description 2
- 239000010935 stainless steel Substances 0.000 description 2
- 229930182556 Polyacetal Natural products 0.000 description 1
- 229910000639 Spring steel Inorganic materials 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 229910003460 diamond Inorganic materials 0.000 description 1
- 239000010432 diamond Substances 0.000 description 1
- 238000007730 finishing process Methods 0.000 description 1
- 239000002952 polymeric resin Substances 0.000 description 1
- 229920003002 synthetic resin Polymers 0.000 description 1
Images
Classifications
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- 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
- B29C45/0053—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor combined with a final operation, e.g. shaping
- B29C45/0055—Shaping
-
- 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
- B29C45/0005—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor using fibre reinforcements
-
- 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
- B24B19/00—Single-purpose machines or devices for particular grinding operations not covered by any other main group
- B24B19/02—Single-purpose machines or devices for particular grinding operations not covered by any other main group for grinding grooves, e.g. on shafts, in casings, in tubes, homokinetic joint elements
- B24B19/022—Single-purpose machines or devices for particular grinding operations not covered by any other main group for grinding grooves, e.g. on shafts, in casings, in tubes, homokinetic joint elements for helicoidal grooves
-
- 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
- B29C45/0053—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor combined with a final operation, e.g. shaping
-
- 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
- B29C45/178—Means disposed outside the mould for unscrewing threaded articles, e.g. chuck devices
-
- 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
- F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
- F16B37/00—Nuts or like thread-engaging members
-
- 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
-
- 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
- B29C45/0005—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor using fibre reinforcements
- B29C2045/0012—Skin layers without fibres or with little fibres
-
- 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
- B29C45/0053—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor combined with a final operation, e.g. shaping
- B29C45/0055—Shaping
- B29C2045/0058—Shaping removing material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2081/00—Use of polymers having sulfur, with or without nitrogen, oxygen or carbon only, in the main chain, as moulding material
- B29K2081/04—Polysulfides, e.g. PPS, i.e. polyphenylene sulfide or derivatives thereof
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2105/00—Condition, form or state of moulded material or of the material to be shaped
- B29K2105/06—Condition, form or state of moulded material or of the material to be shaped containing reinforcements, fillers or inserts
- B29K2105/12—Condition, form or state of moulded material or of the material to be shaped containing reinforcements, fillers or inserts of short lengths, e.g. chopped filaments, staple fibres or bristles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2905/00—Use of metals, their alloys or their compounds, as mould material
- B29K2905/08—Transition metals
- B29K2905/12—Iron
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2995/00—Properties of moulding materials, reinforcements, fillers, preformed parts or moulds
- B29K2995/0012—Properties of moulding materials, reinforcements, fillers, preformed parts or moulds having particular thermal properties
-
- 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
- B29L2001/00—Articles provided with screw threads
- B29L2001/005—Nuts
-
- 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
- F16H2025/249—Special materials or coatings for screws or nuts
-
- 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
- F16H25/22—Screw mechanisms with balls, rollers, or similar members between the co-operating parts; Elements essential to the use of such members
- F16H25/2204—Screw mechanisms with balls, rollers, or similar members between the co-operating parts; Elements essential to the use of such members with balls
- F16H25/2214—Screw mechanisms with balls, rollers, or similar members between the co-operating parts; Elements essential to the use of such members with balls with elements for guiding the circulating balls
Definitions
- the present invention relates to a resin nut for a ball screw and a manufacturing method thereof, and more particularly to a resin nut for a ball screw by injection molding of a fiber reinforced resin in which a fiber material is mixed as a reinforcing material in a matrix resin and a manufacturing method thereof.
- Patent Document 1 a resin nut made of a fiber reinforced resin molded product in which whisker is mixed with a matrix resin made of PPS (polyphenylene sulfide resin) is known (for example, Patent Document 1).
- a method of manufacturing this type of resin nut for a feed screw there are a method of cutting a screw groove by cutting and a method of forming a screw groove by injection molding.
- Feed screw nuts made of fiber reinforced resin have a greater load resistance than resin-only feed screw nuts.
- the blade is heavily worn due to the presence of the fiber reinforcing material in cutting with a normal blade. For this reason, it is necessary to use an expensive blade with diamond coating or the like, which increases the production cost.
- the fiber reinforced resin has a higher coefficient of thermal expansion than that of the steel material, the processing speed cannot be increased in order to suppress deformation due to cutting heat, which also causes the production cost to increase.
- Feed screw nuts made of fiber reinforced resin produced by injection molding of thread grooves have higher production efficiency and can reduce production costs compared to those obtained by cutting thread grooves by cutting.
- initial wear appears remarkably in the thread groove when used in a feed screw, and a position error occurs early due to a decrease in the dimensional accuracy of the thread groove.
- a nut for a ball screw that requires high dimensional accuracy is difficult to satisfy the required accuracy.
- the present inventor has eagerly conducted experimental research in order to pursue the cause of the remarkable initial wear of the ball screw nut made of fiber reinforced resin in which the thread groove is formed by injection molding. As a result, the following findings were obtained.
- a skin layer having a thickness of several ⁇ m is formed on the outermost layer (surface) of the thread groove without the presence of fiber material.
- the skin layer is composed only of matrix resin and has low wear resistance compared to the one containing fiber material. The presence of the skin layer in the outermost layer of the thread groove makes the initial wear of the fiber reinforced resin nut remarkable. It turns out that it is one cause to make.
- an orientation layer is formed in which the fiber layer oriented in the direction along the layer surface (thread groove surface) is present in the inner layer rather than the skin layer, and the inner layer further has orientation.
- a core layer is formed in which there are a lot of non-fibrous materials.
- the alignment layer has higher abrasion resistance than the skin layer, the presence of the alignment layer causes the dimensional accuracy of the thread groove to deteriorate over time due to the detachment of the fiber material over time and the wear of the matrix resin accompanying it. I found out that For this reason, when high dimensional accuracy is required, it is preferable that no alignment layer exists from the beginning of use. Further, when used in a ball screw, the fiber material peeled off from the matrix resin hinders the ball from rolling in the thread groove, and causes a decrease in the performance of the ball screw.
- the problem to be solved by the present invention is to reduce the initial wear of the ball screw nut made of fiber reinforced resin in which the thread groove is formed by injection molding based on the result of earnest research conducted by the present inventor.
- Another object of the present invention is to provide a ball screw nut made of a fiber reinforced resin that maintains a high dimensional accuracy over a long period.
- the resin nut for ball screw according to the present invention forms a screw hole (24) including a thread groove (22) by injection molding of a fiber reinforced resin mixed with a fiber material (F) as a reinforcing material in a matrix resin (M).
- the ball nut resin nut according to the present invention preferably has an orientation layer (II) in which a fiber material (F) oriented in a direction along the surface of the thread groove (22) is present, and the orientation layer (II) The thread groove (22) is ground up to.
- the resin nut for a ball screw according to the present invention more preferably has a core layer (III) in which a fiber material (F) having no orientation is present, and the screw groove (22) up to the core layer (III). Has been ground.
- the manufacturing method of the resin nut for ball screws according to the present invention is a manufacturing method of a resin nut for ball screw made of fiber reinforced resin in which a fiber material (F) is mixed as a reinforcing material in matrix resin (M).
- the nut (20) immediately after the first step is an outermost layer and the skin layer (I) where the fiber material (F) is not present.
- the core layer (III) where the fiber material (F) is not present, and the second step is a grinding step for removing at least the skin layer (I).
- the skin layer (I) is removed by the second step, and the fiber material (F) is exposed on the surface of the thread groove (22) from the beginning of use. This reduces initial wear and maintains high dimensional accuracy over a long period of time.
- the second step is a grinding step of removing the alignment layer (II).
- the second step is a grinding step by a grinding allowance (G) in which the core layer (III) is exposed on the groove surface.
- the thread groove is ground until the fiber material in the matrix resin is exposed on the surface of the thread groove. High dimensional accuracy is maintained.
- FIG. 1 The perspective view which shows one Embodiment of the resin nut for ball screws by this invention. Sectional drawing of the ball screw by this embodiment.
- (A) is explanatory drawing which shows typically the internal state before the grinding process of the thread groove part of the resin nut for ball screws by this embodiment
- (B) After completion of the grinding process of the thread groove part of the resin nut for the ball screw Explanatory drawing which shows typically an internal state.
- (A) is a photomicrograph showing the surface before grinding of the thread groove portion of the ball screw resin nut according to the present embodiment
- (B) is a skin layer removed surface of the thread groove portion of the ball screw resin nut.
- the photomicrograph which shows the micrograph which shows the surface of the alignment layer removal state of the thread groove part of the resin nut for the same ball screw.
- the ball screw 1 includes a screw shaft 10 having a male screw groove 12 formed on the outer peripheral surface and a screw hole having a female screw groove 22 formed on the inner peripheral surface. 24 (resin nut for ball screw) 20 and end deflectors 30A and 30B disposed at both ends of the nut 20 in the axial direction.
- the screw shaft 10 is a rolled product made of stainless steel
- the nut 20 is an injection molded product of fiber reinforced resin
- the end deflectors 30A and 30B are made of POM (polyacetal resin), PPS (polyphenylene sulfide resin) or the like. It is an injection molded product of polymer resin.
- the end deflectors 30 ⁇ / b> A and 30 ⁇ / b> B are fitted into recesses 28 formed at both end portions in the axial direction of the nut 20, and are prevented from being detached by the end deflector fixing member 40.
- the end deflector fixing member 40 is a coiling product having a length of a little less than one turn made of spring steel wire, and is continuous with the male screw groove 12, the female screw groove 22, and the female screw groove 22.
- the end deflector 30 is prevented from coming off by engaging with engagement grooves 34 formed in the end deflectors 30A and 30B.
- the screw shaft 10 penetrates through the screw hole 24 in the axial direction, and the male screw groove 12 and the female screw groove 22 cooperate with each other to define the ball rolling path 14 in the through portion.
- the male screw groove 12 and the female screw groove 22 have a Gothic arch shape in which two identical arcs are symmetrically combined.
- a plurality of balls (steel balls) 16 made of stainless steel or the like are rotatably loaded in the ball rolling path 14 and ball return passages 26 and 32 formed in the nut 20 and the end deflector 30 described later. .
- the ball return passage 26 of the nut 20 extends in the axial direction parallel to the screw hole 24 on one side in the radial direction of the screw hole 24, and is formed by bending the end deflector 30 in a hook shape at both ends. It communicates with the ball return passage 32.
- one end deflector 30A scoops the ball 16 from the ball rolling path 14 to the ball return path 32 and the other end deflector 30B. Acts to return the ball 16 from the ball return passage 32 to the ball rolling path 14.
- the matrix resin of the fiber reinforced resin constituting the nut 20 examples include super engineering plastics such as PPS (polyphenylene sulfide resin).
- the fiber material as the reinforcing material is preferably a short fiber having a fiber thickness of about 0.1 ⁇ m to 5.0 ⁇ m and a length of about 1 ⁇ m to 100 ⁇ m.
- fiber materials glass fiber, carbon fiber (graphite fiber), polyamide fiber, boron fiber, aramid fiber, silicon carbide whisker, silicon nitride whisker, zinc oxide whisker, titanium boride whisker, metal fiber, silica fiber, titanium oxide fiber Etc.
- the nut 20 is manufactured by using a fiber reinforced resin in which a fiber material is mixed in a matrix resin as an injection resin material, and forming a screw hole in which a lower screw groove having a size and shape before finishing a normal female screw groove 22 is formed. Including the first step of injection molding of the entire nut 20 using a molding die, and screwing the lower screw groove until the fiber material of the fiber reinforced resin is exposed on the groove surface after the injection molding (after the resin is cured). And a second step of grinding to a regular female screw groove 22 by using a grinder.
- the bottom thread groove before finishing formed by injection molding has the same phase as the regular female thread groove 22 and the same thread pitch, and the same shape as the regular female thread groove 22, that is, a Gothic arch shape.
- the thread groove is shallower than the regular female thread groove 22 by a grinding allowance G (see FIG. 3A) in the second step.
- the lower thread groove before finishing is a thread groove whose groove cross-sectional area is smaller than the regular female thread groove 22 by the grinding allowance G.
- the grinding allowance G is uniform over the entire screw groove, so that the entire surface of the screw groove is ground from the first grinding pass. From the first time, the total grinding amount (removal total amount) in each grinding pass is large. Thus, efficient grinding can be performed.
- the lower thread groove before finishing may be formed with high accuracy to such an extent that shape accuracy and dimensional accuracy are acceptable as regular thread grooves. As a result, the grinding process as the finishing process is performed in a short time with a small amount of grinding.
- FIG. 3A schematically shows the internal state of the thread groove portion of the nut 20 (nut material) immediately after the first step, that is, before grinding
- FIG. 3B shows the screw of the nut 20.
- the internal state after completion of grinding of the groove portion is schematically shown.
- symbol M indicates a matrix resin
- symbol F indicates a fiber material
- symbol B indicates a void.
- symbol 23 indicates a finish. The front lower thread groove is shown.
- the nut 20 immediately after the injection molding before the grinding process is in the outermost layer, the fiber material F is not present, and the skin layer I including only the matrix resin M, and the skin layer
- each layer does not exist with a clear boundary surface, and gradually changes from the skin layer I to the alignment layer II and gradually changes from the alignment layer II to the core layer III.
- the second step at least the skin layer I of the lower thread groove 23 before finishing the female side thread groove 22 is removed, and grinding is performed until the fiber material F in the matrix resin M is exposed on the surface of the female side thread groove 22.
- the alignment layer II is removed with the grinding allowance G, and grinding is performed until the core layer III is exposed on the surface of the female screw groove 22 as shown in FIG.
- the grinding allowance G may be 0.2 mm or less.
- This grinding allowance G is set to the minimum necessary limit that the core layer III is exposed to the surface of the female screw groove 22 so that the void B is not exposed to the surface of the female screw groove 22 and to reduce grinding time. It is preferred that
- F fiber material F near the orientation layer II
- F is ground and removed at the end in the fiber longitudinal direction, and the end surface is exposed flush with the surface of the female screw groove 22.
- FIG. 4A to 4C are micrographs of the thread groove portion of the nut 20.
- FIG. 4A shows the surface of the thread groove before grinding
- FIG. 4B shows the thread groove with the skin layer removed
- FIG. 4C shows the surface of the thread groove surface with the alignment layer removed.
- FIG. 4 (A) it is not recognized that the fiber material is present on the surface of the thread groove
- FIG. 4 (B) the alignment layer II is exposed on the surface of the thread groove, and the thread groove appears in white in a piece line shape.
- the presence of the fiber material F1 extending along the surface is often observed.
- FIG. 4C the core layer III is exposed on the surface of the thread groove, and the presence of the fiber material F1 extending along the surface of the thread groove is present. Only a few are recognized, and the presence of the fiber material F2 with the ground end face exposed on the surface of the thread groove is often observed.
- the skin layer I composed only of the matrix resin is not present on the surface of the female screw groove 22 from the beginning of use in the second step described above, early wear of the female screw groove 22 is avoided. Furthermore, since the alignment layer II containing a large amount of the fiber material F1 extending along the surface of the thread groove is not substantially present on the surface of the female thread groove 22 from the beginning of use, the fiber material F present in the alignment layer II. A decrease in the wear resistance of the female screw groove 22 due to the peeling is avoided, and the wear resistance is improved. Furthermore, the end of the fiber material F existing in the core layer III in the fiber longitudinal direction is ground and removed, and many end surfaces of the fiber material F are exposed to the surface of the female thread groove 22.
- the wear resistance of the female thread groove 22 is further improved by the wear resistance of the fiber material F. Further, since the peeling of the fiber material F is reduced or eliminated, the peeled fiber material does not interfere with the rolling of the ball 16 in the ball rolling path 14.
- the skin layer I is ground and removed, the skin layer I and the alignment layer II are ground and removed, and grinding is performed until the core layer III is reached.
- the end of the fiber material F in the longitudinal direction of the fiber material F is ground and removed by being oriented in the depth direction of III, and grinding is performed until the end surface is exposed flush with the surface of the female screw groove 22.
- the wear resistance performance of the female screw groove 22 is improved.
- the necessary minimum level of grinding may be selected according to the required wear resistance performance of the female screw groove 22.
- the ball circulation system is not limited to the end deflector system, and any of a tube system, a deflector system, and an end cap system may be used.
- the cross-sectional shape of the thread groove is not limited to the Gothic arch shape, and may be a perfect circle, an ellipse, a V shape, or the like.
- the present invention is not limited to a resin nut for a ball screw, but includes a ball screw shaft, a sliding screw shaft, a sliding screw nut, a ball rolling linear guide, a slider having a ball rolling guide groove, a ball bearing, and the like It can be applied to a fiber reinforced resin member having a rolling surface or a sliding surface, such as a race member of a rolling bearing or a sleeve for a sliding bearing.
- FIG. 5 shows an embodiment of a ball bearing 50 according to the present invention.
- the ball bearing 50 includes an annular outer race 54 having a ball rolling groove 52 having an arc-shaped bottom surface on an outer peripheral surface and an annular inner race having a ball rolling groove 56 having an arc-shaped bottom surface on an inner peripheral surface. 58, and a plurality of balls made of steel or ceramics 60 that are movably engaged with the ball rolling groove 52 of the outer race 54 and the ball rolling groove 56 of the inner race 58 that are concentrically arranged.
- Outer race 54 and inner race 58 are injection-molded products of fiber reinforced resin.
- the fiber reinforced resin matrix resin constituting the outer race 54 and the inner race 58 include super engineering plastics such as PPS (polyphenylene sulfide resin).
- the fiber material as the reinforcing material is preferably a short fiber having a fiber thickness of about 0.1 ⁇ m to 5.0 ⁇ m and a length of about 1 ⁇ m to 100 ⁇ m.
- fiber materials glass fiber, carbon fiber (graphite fiber), polyamide fiber, boron fiber, aramid fiber, silicon carbide whisker, silicon nitride whisker, zinc oxide whisker, titanium boride whisker, metal fiber, silica fiber, titanium oxide fiber Etc.
- the outer lace 54 and the inner lace 58 are manufactured by using a fiber reinforced resin in which a fiber material is mixed in a matrix resin as an injection resin material, and forming lower grooves of dimensions and shapes before finishing the regular ball rolling grooves 52 and 56.
- the outer race 54 and the inner race 58 before grinding immediately after injection molding are in the outermost layer and have no fiber material, as in the nut 20 described above.
- each layer is not actually partitioned and has a clear boundary surface, and gradually changes from the skin layer to the alignment layer, and gradually from the alignment layer to the core layer. Change.
- the second step at least the skin layer of the lower groove before finishing the ball rolling grooves 52 and 56 is removed, and grinding is performed until the fiber material in the matrix resin is exposed on the surfaces of the ball rolling grooves 52 and 56.
- grinding is performed until the alignment layer is removed with a predetermined grinding allowance and the core layer is exposed on the surfaces of the ball rolling grooves 52 and 56.
- This grinding allowance is limited to the minimum necessary limit that the core layer is exposed to the surface of the ball rolling grooves 52, 56 so that the voids are not exposed to the surfaces of the ball rolling grooves 52, 56 and to reduce grinding time.
- it is defined.
- the skin layer and the alignment layer are removed, and the ball rolling grooves 52 and 56 in which the voids generated inside the core layer are not exposed to the surface while grinding reaches the core layer are obtained.
- the ball rolling grooves 52 and 56 are important in showing high wear resistance.
- the fiber material existing in the grinding allowance is aligned in the depth direction of the core layer among the fiber materials existing in the core layer (near the alignment layer)
- the fiber material is ground and removed at the ends in the fiber longitudinal direction, and the end faces are exposed flush with the surfaces of the ball rolling grooves 52 and 56.
- the skin layer composed only of the matrix resin is not present on the surface of the ball rolling grooves 52 and 56 from the beginning of use in the second step described above, early wear of the ball rolling grooves 52 and 56 is avoided. Further, since the alignment layer containing a large amount of fiber material extending along the groove surface does not substantially exist on the surface of the ball rolling grooves 52 and 56 from the beginning of use, the fiber material existing in the alignment layer is peeled off. A decrease in wear resistance of the ball rolling grooves 52 and 56 is avoided, and the wear resistance is improved. Further, the fiber longitudinal end of the fiber material present in the core layer is ground and removed, and many of the end surfaces are exposed flush with the surfaces of the ball rolling grooves 52 and 56. The fiber material is a matrix resin. Thus, the wear resistance of the ball rolling grooves 52 and 56 is further improved by the wear resistance of the fiber material.
- the skin layer is ground and removed, the skin layer and the alignment layer are ground and removed, and further grinding is performed until the core layer is reached.
- the end of the fiber material in the longitudinal direction of the fiber material is ground and removed, and grinding is performed until the end face is flush with the surface of the ball rolling grooves 52, 56, thereby rolling the ball stepwise.
- the wear resistance performance of the grooves 52 and 56 is improved. For the four-stage grinding, it is sufficient to select the minimum necessary one according to the required wear resistance performance of the ball rolling grooves 52 and 56.
- FIG. 6 shows an embodiment of a sliding bearing sleeve 70.
- the slide bearing sleeve 70 has a cylindrical shape and a bearing hole 72 having a circular cross section.
- the slide bearing sleeve 70 is an injection molded product of fiber reinforced resin.
- the matrix resin of the fiber reinforced resin constituting the slide bearing sleeve 70 include super engineering plastics such as PPS (polyphenylene sulfide resin).
- the fiber material as the reinforcing material is preferably a short fiber having a fiber thickness of about 0.1 ⁇ m to 5.0 ⁇ m and a length of about 1 ⁇ m to 100 ⁇ m.
- fiber materials glass fiber, carbon fiber (graphite fiber), polyamide fiber, boron fiber, aramid fiber, silicon carbide whisker, silicon nitride whisker, zinc oxide whisker, titanium boride whisker, metal fiber, silica fiber, titanium oxide fiber Etc.
- the sliding bearing sleeve 70 is manufactured by using a fiber reinforced resin in which a fiber material is mixed in a matrix resin as an injection resin material.
- the sliding bearing sleeve 70 immediately after injection molding and before grinding is similar to the nut 20 described above, and is in the outermost layer and has no fiber material, and has a skin layer made of only a matrix resin and an inner layer from the skin layer. It has an orientation layer in which the fiber material oriented in the direction along the layer surface occupies most, and a core layer in which the fiber material that is in the inner layer and has no orientation further occupies the inner layer.
- each layer is not actually partitioned and has a clear boundary surface, and gradually changes from the skin layer to the alignment layer and gradually changes from the alignment layer to the core layer. To do.
- the second step at least the skin layer of the lower groove before finishing the bearing hole 72 is removed, and grinding is performed until the fiber material in the matrix resin is exposed on the surface (inner peripheral surface) of the bearing hole 72.
- grinding is performed until the alignment layer is removed with a predetermined grinding allowance and the core layer is exposed on the surface of the bearing hole 72.
- the grinding allowance is preferably set to the minimum necessary limit that the core layer is exposed to the surface of the bearing hole 72 so that the void is not exposed to the surface of the bearing hole 72 and to reduce grinding time.
- the skin layer and the orientation layer are removed, and obtaining the bearing hole 72 in which the void generated inside the core layer is not exposed to the surface while grinding reaches the core layer is obtained. It is important for the inner peripheral surface to exhibit high wear resistance.
- the fiber material existing in the grinding allowance is aligned in the depth direction of the core layer among the fiber materials existing in the core layer (near the alignment layer)
- the fiber material is ground and removed at the end in the fiber longitudinal direction, and the end surface is exposed flush with the surface of the bearing hole 72.
- the skin layer composed only of the matrix resin does not exist on the surface of the bearing hole 72 from the beginning of use by the second process described above, early wear of the bearing hole 72 is avoided. Furthermore, since the alignment layer containing a large amount of fiber material extending along the hole surface does not substantially exist on the surface of the bearing hole 72 from the beginning of use, the bearing hole 72 due to peeling of the fiber material existing in the alignment layer is present. A decrease in wear resistance is avoided, and the wear resistance is improved. Furthermore, the fiber longitudinal ends of the fiber material present in the core layer are ground and removed, and many of the end surfaces are exposed flush with the surface of the bearing hole 72, and the fiber material is hard and pierced into the matrix resin. Since it acts like a vertical pile, the wear resistance of the bearing hole 72 is further improved by the wear resistance of the fiber material.
- the skin layer is ground and removed, the skin layer and the alignment layer are ground and removed, and further grinding is performed until the core layer is reached.
- the end portion in the fiber longitudinal direction of the fiber material is ground and removed, and grinding is performed until the end surface is flush with the surface of the bearing hole 72, whereby the wear resistance performance of the bearing hole 72 is stepwise. Will improve.
- the minimum necessary one may be selected according to the required wear resistance performance of the bearing hole 72.
- Ball screw 10 Screw shaft 12 Male thread groove 14 Ball rolling path 16 Ball 20 Nut (resin nut for ball screw) 22 Female side thread groove 24 Screw hole 26 Ball return path 30 End deflector 32 Ball return path 50 Ball bearing 52 Ball rolling groove 54 Outer race 56 Ball rolling groove 58 Inner race 70 Slide bearing sleeve 72 Bearing hole I Skin layer II Orientation Layer III Core layer B Void F Fiber material G Grinding allowance M Matrix resin
Abstract
Description
10 ねじ軸
12 雄側ねじ溝
14 ボール転動路
16 ボール
20 ナット(ボールねじ用樹脂ナット)
22 雌側ねじ溝
24 ねじ孔
26 ボール戻し通路
30 エンドデフレクタ
32 ボール戻し通路
50 ボール軸受
52 ボール転動溝
54 アウタレース
56 ボール転動溝
58 インナレース
70 滑り軸受用スリーブ
72 軸受孔
I スキン層
II 配向層
III コア層
B ボイド
F 繊維材
G 研削代
M マトリックス樹脂
Claims (7)
- マトリックス樹脂に強化材として繊維材を混入された繊維強化樹脂の射出成形によってねじ溝を含んでねじ孔を成形されているボールねじ用樹脂ナットであって、
前記繊維材が前記ねじ溝の表面に露呈するまで前記ねじ溝が研削されているボールねじ用樹脂ナット。 - 前記ねじ溝の表面に沿う方向に配向した繊維材が存在する配向層を有し、前記配向層まで前記ねじ溝が研削されている請求項1に記載のボールねじ用樹脂ナット。
- 配向性を有さない繊維材が存在するコア層を有し、前記コア層まで前記ねじ溝が研削されている請求項1に記載のボールねじ用樹脂ナット。
- マトリックス樹脂に強化材として繊維材を混入された繊維強化樹脂製のボールねじ用樹脂ナットの製造方法であって、
正規のねじ溝の仕上げ前の寸法・形状の下ねじ溝を形成されたねじ孔を含んでナットを成形金型を用いて射出成形する第1の工程と、
前記繊維材が溝表面に露呈するまで前記下ねじ溝を研削してねじ溝を仕上げる第2の工程と、
を有するボールねじ用樹脂ナットの製造方法。 - 前記第1の工程直後の前記ナットは、最外層にあって前記繊維材が存在しないスキン層と、前記スキン層より内層にあって層面に沿う方向に配向した繊維材が存在する配向層と、前記配向層より更に内層にあって配向性を有さない繊維材が存在するコア層とを有しており、
前記第2の工程は、少なくとも前記スキン層を除去する研削工程である請求項4に記載のボールねじ用樹脂ナットの製造方法。 - 前記第2の工程は、前記配向層を除去する研削工程である請求項5に記載のボールねじ用樹脂ナットの製造方法。
- 前記第2の工程は、コア層が溝表面に露呈する研削代による研削工程である請求項5に記載のボールねじ用樹脂ナットの製造方法。
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CN201380072693.9A CN104981629B (zh) | 2013-02-12 | 2013-11-18 | 滚珠丝杠用树脂螺母及其制造方法 |
US14/392,058 US10046489B2 (en) | 2013-02-12 | 2013-11-18 | Plastic nut for ball screw and method for manufacturing same |
DE112013006647.5T DE112013006647T5 (de) | 2013-02-12 | 2013-11-18 | Kunststoffmutter für eine Kugelgewindespindel und Verfahren zum Herstellen einer solchen |
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JP2013-024877 | 2013-02-12 | ||
JP2013024877A JP6045932B2 (ja) | 2013-02-12 | 2013-02-12 | ボールねじ用樹脂ナット及びその製造方法 |
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WO2014125534A1 true WO2014125534A1 (ja) | 2014-08-21 |
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PCT/JP2013/006759 WO2014125534A1 (ja) | 2013-02-12 | 2013-11-18 | ボールねじ用樹脂ナット及びその製造方法 |
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US (1) | US10046489B2 (ja) |
JP (1) | JP6045932B2 (ja) |
CN (1) | CN104981629B (ja) |
DE (1) | DE112013006647T5 (ja) |
TW (1) | TW201441509A (ja) |
WO (1) | WO2014125534A1 (ja) |
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USD755619S1 (en) * | 2015-01-30 | 2016-05-10 | Kuroda Precision Industries Ltd. | Ball screw |
CN107509353A (zh) * | 2016-06-14 | 2017-12-22 | 伊姆西公司 | 用于机架的杆以及与机架配合使用的固定装置 |
EP3427921B1 (en) * | 2017-07-14 | 2021-11-17 | Crompton Technology Group Limited | Composite ball screw |
FR3075305B1 (fr) * | 2017-12-18 | 2020-02-14 | Valeo Systemes De Controle Moteur | Dispositif d'actionnement comportant une bague en acier inoxydable |
CN207927103U (zh) * | 2018-03-30 | 2018-09-28 | 京东方科技集团股份有限公司 | 连接件、显示装置及车辆 |
DE102019210669B3 (de) * | 2019-07-18 | 2021-01-21 | Robert Bosch Gmbh | Elektromechanischer Bremsdruckerzeuger oder Bremsdruckverstärker mit einer Gewindetriebanordnung |
JP6903353B2 (ja) * | 2019-09-13 | 2021-07-14 | 三和ニードル・ベアリング株式会社 | 樹脂製ナットおよびそれを用いた滑りネジ装置 |
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- 2013-02-12 JP JP2013024877A patent/JP6045932B2/ja active Active
- 2013-11-18 US US14/392,058 patent/US10046489B2/en active Active
- 2013-11-18 DE DE112013006647.5T patent/DE112013006647T5/de active Pending
- 2013-11-18 WO PCT/JP2013/006759 patent/WO2014125534A1/ja active Application Filing
- 2013-11-18 CN CN201380072693.9A patent/CN104981629B/zh active Active
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2014
- 2014-02-06 TW TW103103919A patent/TW201441509A/zh unknown
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JPH07290902A (ja) * | 1994-04-27 | 1995-11-07 | Bridgestone Corp | 樹脂ホイール及びその製造方法 |
JPH10281132A (ja) * | 1997-03-31 | 1998-10-20 | Ntn Corp | 樹脂製ナット、その製造方法およびすべりねじ装置 |
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US10046489B2 (en) | 2018-08-14 |
JP6045932B2 (ja) | 2016-12-14 |
DE112013006647T5 (de) | 2015-11-26 |
CN104981629B (zh) | 2017-04-26 |
TW201441509A (zh) | 2014-11-01 |
CN104981629A (zh) | 2015-10-14 |
US20150314498A1 (en) | 2015-11-05 |
JP2014152893A (ja) | 2014-08-25 |
TWI560382B (ja) | 2016-12-01 |
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