WO2011089742A1 - 金属ガラス締結ねじ - Google Patents
金属ガラス締結ねじ Download PDFInfo
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- WO2011089742A1 WO2011089742A1 PCT/JP2010/060540 JP2010060540W WO2011089742A1 WO 2011089742 A1 WO2011089742 A1 WO 2011089742A1 JP 2010060540 W JP2010060540 W JP 2010060540W WO 2011089742 A1 WO2011089742 A1 WO 2011089742A1
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- screw
- fastening
- glass
- metallic glass
- bulk
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Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21H—MAKING PARTICULAR METAL OBJECTS BY ROLLING, e.g. SCREWS, WHEELS, RINGS, BARRELS, BALLS
- B21H3/00—Making helical bodies or bodies having parts of helical shape
- B21H3/02—Making helical bodies or bodies having parts of helical shape external screw-threads ; Making dies for thread rolling
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61L—METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES
- A61L31/00—Materials for other surgical articles, e.g. stents, stent-grafts, shunts, surgical drapes, guide wires, materials for adhesion prevention, occluding devices, surgical gloves, tissue fixation devices
- A61L31/02—Inorganic materials
- A61L31/022—Metals or alloys
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21H—MAKING PARTICULAR METAL OBJECTS BY ROLLING, e.g. SCREWS, WHEELS, RINGS, BARRELS, BALLS
- B21H3/00—Making helical bodies or bodies having parts of helical shape
- B21H3/02—Making helical bodies or bodies having parts of helical shape external screw-threads ; Making dies for thread rolling
- B21H3/022—Making helical bodies or bodies having parts of helical shape external screw-threads ; Making dies for thread rolling combined with rolling splines, ribs, grooves or the like, e.g. using compound dies
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C1/00—Making non-ferrous alloys
- C22C1/11—Making amorphous alloys
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C45/00—Amorphous alloys
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C45/00—Amorphous alloys
- C22C45/003—Amorphous alloys with one or more of the noble metals as major constituent
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C45/00—Amorphous alloys
- C22C45/005—Amorphous alloys with Mg as the major constituent
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C45/00—Amorphous alloys
- C22C45/10—Amorphous alloys with molybdenum, tungsten, niobium, tantalum, titanium, or zirconium or Hf as the major constituent
-
- 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
- F16B33/00—Features common to bolt and nut
- F16B33/006—Non-metallic fasteners using screw-thread
-
- 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
- F16B33/00—Features common to bolt and nut
- F16B33/02—Shape of thread; Special thread-forms
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21H—MAKING PARTICULAR METAL OBJECTS BY ROLLING, e.g. SCREWS, WHEELS, RINGS, BARRELS, BALLS
- B21H3/00—Making helical bodies or bodies having parts of helical shape
- B21H3/02—Making helical bodies or bodies having parts of helical shape external screw-threads ; Making dies for thread rolling
- B21H3/06—Making by means of profiled members other than rolls, e.g. reciprocating flat dies or jaws, moved longitudinally or curvilinearly with respect to each other
-
- 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
- F16B35/00—Screw-bolts; Stay-bolts; Screw-threaded studs; Screws; Set screws
- F16B35/04—Screw-bolts; Stay-bolts; Screw-threaded studs; Screws; Set screws with specially-shaped head or shaft in order to fix the bolt on or in an object
- F16B35/041—Specially-shaped shafts
Definitions
- the present invention relates to a bulk metal glass made of amorphous material, a molding method thereof, and a fastening screw characterized by characteristics created by the molding method.
- Bulk metallic glass is an amorphous alloy, and generally has a high strength (high yield stress) and an elastic limit strain (yield strain) nearly 10 times that of ordinary metals.
- the combination can change the strength and elastic modulus (Young's modulus), and can be formed into a cylindrical shape having a critical diameter or less determined by the chemical component contained by casting.
- a rotational centrifugal force is used in order to apply amorphous bulk metal glass to small mechanical parts, etc.
- a rotational centrifugal force is used in the casting method taking advantage of its small solidification shrinkage.
- Various tools, apparatuses, methods and the like for improving the filling property have been proposed.
- Patent Document 2 After heating the surface of a cylindrical material having a bulk metallic glass on the surface to a glass transition temperature (Tg) or higher at which the bulk metallic glass causes viscous flow, the viscous fluidity is utilized. There has been proposed a method of forming by pressing against an uneven die. (For example, refer to Patent Documents 3 and 4) In addition, by thermally spraying metal glass on the surface of the product, a proposal has been made to give the surface the characteristics of bulk metal glass while leaving the characteristics of the conventional material inside. . (For example, see Patent Documents 5 and 6)
- JP 2008-238214 A JP 2008-126313 A Japanese Patent Laid-Open No. 2008-200734 JP 2005-173558 A JP 2007-131952 A JP 2005-201789 A
- the fastening screw fixes the material to be fastened so as not to loosen by using the frictional force generated on the contact bearing surface and the screw surface of the meshing portion of the screw by the axial force remaining after the fastening.
- the prevention of screw loosening has been done mainly by making the nut a special shape or special structure.
- the screw itself is difficult to loosen, it can be easily removed and used repeatedly, and there are fields where it can be used. spread.
- the strength is increased so that the tightening force at the time of fastening can be increased, and at the same time the elastic modulus of the screw is lowered to facilitate deformation and the contact area with the fastened body can be increased, the frictional force is increased.
- the strength is increased so that the tightening force at the time of fastening can be increased, and at the same time the elastic modulus of the screw is lowered to facilitate deformation and the contact area with the fastened body can be increased, the frictional force is increased.
- a screw that is difficult to loosen is realized, but
- Bulk metallic glass is made of an amorphous material and generally has high strength and an elastic limit strain approximately 10 times that of a normal metal, and the elastic modulus can be changed by a combination of kinds of constituent elements. If bulk metal glass can stably form a screw shape without harmful defects, it can be used for conventional screws by utilizing the high strength, low elastic modulus, and high elastic limit strain of bulk metal glass. Screws that are less likely to loosen can be made. However, since bulk metallic glass is not a crystalline metal, plastic deformation (deformation with permanent strain) due to dislocations (linear defects peculiar to crystalline metals introduced by processing) does not occur, and various deformation mechanisms have been devised.
- the ductility is considered to be extremely poor near room temperature
- the processing method is a casting method (transfer processing using molten metal), or a supercooled liquid temperature range (generally 400) that causes a viscous flow inherent to bulk metallic glass at a temperature above the glass transition temperature. In the vicinity of °C, it is mainly molded in a range of plus or minus several tens of °C. Below this glass transition temperature, the degree of processing is particularly large, and the strain gradient of the processed part (adjacent part) It was thought that it was difficult to apply to the rolling process (one of the processing methods using plastic deformation) of a screw having a large strain difference. *
- Bulk metal glass is a difficult-to-cut material for cutting blades.
- the wear of the blade edge is marked and stable. It is very difficult to produce. Moreover, material loss arises and it is not preferable economically.
- the fastening screw used in contact with the inside of the living body and the outside of the living body is manufactured by cutting and has a problem in productivity.
- the property of being difficult to loosen is very important for a living body, but has not been emphasized so far.
- a metal glass fastening screw which is difficult to loosen utilizing the characteristics of bulk metal glass can be stably manufactured, and a process for improving the ductility of the surface at the time of molding and imparting reliability to the metal glass fastening screw is provided.
- the purpose is to provide.
- a bulk metallic glass made of amorphous material exhibits little ductility in the uniaxial tensile test below the glass transition temperature at which viscous flow starts, but slightly ductility is seen in the uniaxial compression test.
- it is not suitable for all screws, but has a thread angle that can be used as a practical screw.
- the plastic deformation region is under compressive stress during the process.
- it is considered that the opening of cracks generated during deformation is suppressed, and a considerable amount of deformation is achieved without progressing cracks.
- slip band a phenomenon that occurs on the surface that generates the maximum shear stress and is a deformation band of several tens of nanometers that enables plastic deformation, a characteristic phenomenon seen in bulk metallic glass. It is said that it causes plastic strain (plastic strain is accumulated (integrated) and becomes plastic deformation).
- this slip is local and non-uniform, unlike normal deformation due to dislocation of a normal crystalline metal, it separates and breaks when a tensile force is applied.
- the present invention is characterized in that in processing of screw threads and screw grooves, amorphous bulk metallic glass is formed by rolling at a temperature equal to or lower than the glass transition temperature of bulk metallic glass as a workpiece. It is a metal glass fastening screw.
- Bulk metallic glass has a characteristic that the ductility of the portion including the slip band is improved by introducing plastic strain by plastic working such as rolling.
- the present invention makes effective use of this to form a rolling process in order to relieve the stress concentration of the tensile stress generated in the bottom region of the screw groove due to the tensile force (axial force) applied to the screw during fastening.
- a metal glass fastening screw having a relationship of d> 0.022 ⁇ D, where d is the depth from the bottom of the thread groove in the region where plastic strain is introduced by D and D is the outer diameter of the male screw It is. *
- the present invention is a metallic glass fastening screw characterized by being a triangular screw having a thread angle in a range of 40 to 70 degrees.
- the present invention is the metallic glass fastening screw, wherein the bulk metallic glass includes at least one of a Ti group, a Pd group, or a Zr group, and is used for a living body.
- the bulk metallic glass when fastening a fastened material having a low yield point and a low elastic modulus, the bulk metallic glass is fastened in order to prevent loosening due to permanent strain (depression) of the fastened material during fastening.
- It is a metallic glass fastening screw characterized by including any of Mg group, Pt group, Ti group, and Zr group having an elastic modulus equal to or lower than that of the material.
- the average stress in the region where the plastic deformation of the bulk metallic glass is a compressive stress or a tensile stress that is one third or less of the tensile breaking strength of the bulk metallic glass is formed by rolling. This is a method for manufacturing a metallic glass fastening screw.
- a high-strength, low-elastic modulus, high-elastic limit strain which is a common characteristic of amorphous bulk metallic glass, and a high elastic limit strain are realized in the screw, thereby providing a fastening screw that is difficult to loosen.
- it has stable quality and productivity by rolling at room temperature and a relatively low temperature that is higher than room temperature but below the glass transition temperature.
- Bulk metallic glass has the characteristics of high strength but low elastic modulus and high elastic limit strain that is not found in ordinary metals, so when this is applied to a fastening screw, it depends on the strain of the material to be fastened. Axial force change can be kept small. For example, even if the material to be fastened is compressed and deformed by an external force or vibration, the reduction of the axial force is suppressed, and a screw with a stable axial force and less loosening can be realized compared to a steel screw with a high elastic modulus.
- Light metal materials generally have a low yield point and a low elastic modulus.
- deformation is caused on the side of the material to be fastened on the seating surface, causing loosening.
- the screw-side seating surface will be deformed in the same way as the material to be fastened.
- the contact area is increased, the contact pressure is lowered to suppress the depression, and the frictional force is increased, so that it is possible to perform the fastening which is difficult to loosen.
- Rolling process reduces material loss, which is a general characteristic of plastic processing, and mechanically crushes micro defects introduced in casting (forging effect), so part of defects near the surface This makes it possible to make a highly reliable screw.
- bulk metallic glass has a combination of components that have corrosion resistance and biocompatibility (the human body does not show a rejection reaction when incorporated into the human body). By combining the components, it is possible to achieve fastening that is difficult to loosen in a wide range of application fields.
- the screw applied here is applied not only to a normal fastening screw having a screw head but also to a general screw used by applying an axial force to the screw portion.
- FIGS. 1 to 5 An embodiment of the present invention will be described with reference to FIGS. 1 to 5, and a method for manufacturing the present screw will be described. The test results are shown in FIGS. *
- the bulk metal glass used as a material has the common advantage of being a high-strength, low elastic modulus and high elastic limit strain that is advantageous for fastening screws that are difficult to loosen.
- the metal component is selected by selecting an alloy component of the bulk metallic glass that is suitable for the material to be fastened, the fastening conditions, and the environment. Glass fastening screws can be made.
- the modulus of elasticity is low in order to prevent loosening due to permanent strain (depression) of the material to be fastened.
- Bulk metal glass such as Mg group, Pt group, Ti group, Zr group or the like which is equal or low is selected as the material of the fastening screw.
- FIG. 1 shows a method of forming a bulk metallic glass into an intermediate processed product before being rolled into a screw.
- Bulk metal glass can be cast into a columnar shape after the component elements are heated and melted to a melting point or higher by arc melting or the like.
- the bulk metallic glass round bar 1 of FIG. 1 (a) cast into a cylindrical shape is formed by cutting like the intermediate shape product 2 of the machined screw of FIG. 1 (a).
- the previous intermediate product can be made.
- bulk metal glass is not easy to cut, loss due to cutting occurs, and if it is necessary to drill holes in the head like hexagon socket head screws, it is difficult to do so.
- the screw head 41 and the screw shaft portion 42 are It is preferable to cast an intermediate processed product before rolling, such as the intermediate shape product 4 of the screw by casting in FIG. *
- FIG. 2 shows the mechanism of the rolling process.
- FIG. 2 (a) shows that an intermediate shape product 4 of a screw by casting is inserted between two molds (rolling die moving side P1 and rolling die fixing side P2) having a thread and a groove shape. Thus, the rolling process is performed by rolling down the screw shaft portion 42.
- FIG. 2 (b) shows the rolling process by gradually transferring the die shape from the intermediate shape product 4 of the screw to the screw as in the initial stage 5 of the rolling process and the middle stage 6 of the rolling process. This is a rolling process in which the completed screw 7 is formed. *
- the average stress is an average value of normal stresses generated in planes orthogonal to each other at a certain point. Whether the point is in a compressed state (having a negative value) or in a tensile state (having a positive value). This is also called average normal stress. Equivalent stress is a value related to shear stress that occurs in a direction parallel to the surface. Generally, in order to make it easy to understand the state of multiaxial stress that is not uniform, when a simple round bar is pulled (uniaxial) It corresponds to the stress of tension or uniaxial tension.
- the equivalent strain is a general non-uniform strain state corresponding to a uniaxial tensile strain.
- the tensile breaking strength is a value obtained by dividing a tensile breaking load by a cross-sectional area and converting it to a value per unit area, and has the same unit as stress.
- FIG. 3 shows the stress distribution of the thread cross section generated during the rolling process calculated by the finite element method analysis.
- the contents will be described with FIG. 2 showing the rolling process.
- the rolling process is performed between two dies of a rolling die moving side P1 and a rolling die fixing side P2 having shapes corresponding to threads and screw grooves. Is rolled while pressing the screw shaft portion 42, whereby the mold shape is transferred to this, and the thread and the thread groove are formed.
- a rigid and completely plastic model that does not work harden (a model that assumes that the equivalent stress that initiates plastic deformation takes a constant value) is adopted.
- FIG. 3 (b) showing the average stress distribution of the thread cross section shows the average stress distribution at the same processing time.
- Most of the average stress is on the screw thread and screw groove side (right side in the figure) from the contour line Q1 of 0 MPa. It can be seen that the mean stress is negative, it is under compressive stress, and the contour line Q2 having an equivalent stress indicating the boundary of the plastic deformation region of 1800 MPa is also included in this.
- FIG. 3 (b) there is a portion where the average stress slightly exceeds 0 MPa in the vicinity of the tip of the screw thread that is not in contact with the mold at this time of processing. It can be seen that it is 600 MPa or less, which is one third of the strength (1800 MPa). Thus, it was theoretically shown that the rolling process has the effect of suppressing the breakage due to the progress of cracks. *
- the thread portion of the screw and the thread groove portion receive a force through the mold during the rolling process, but due to the shape of the screw, the state of the stress generated in the bulk metallic glass that is the workpiece during the rolling process, That is, whether the average stress during processing is negative (compression) or positive (tensile) is determined.
- the thread angle Q3 of the triangular screw in FIG. 4 (a) showing the cross section of the screw thread cannot sufficiently hold the axial force at 40 degrees or less, and if it exceeds 70 degrees, Frictional force decreases and becomes easier to loosen. Therefore, in order to maximize the function as a fastening screw, the thread angle needs to be in the range of 40 to 70 degrees. Further, in the screw having these thread angles, the average stress in the region in which plastic strain occurs during plastic forming and plastic deformation is a tensile stress that is one third or less of the compression or tensile breaking strength. As shown by finite element method analysis and experiment, respectively, bulk metal glass can be rolled at or below the glass transition temperature. *
- the screw Since the screw has a thread groove, when it is fastened and a tensile force (axial force) acts on the screw, high stress due to the groove shape is generated in the vicinity of the thread groove (the thread groove has a V shape). And is similar to the notch shape). Especially, the bottom vicinity of the groove
- FIG. 5 shows a cross-sectional view of a screw made by rolling.
- a region where plastic strain is introduced by rolling that is, a region 12 including a slip band peculiar to bulk metallic glass is indicated by hatching.
- a tensile force axial force
- the bottom portion of the screw groove where the high tensile stress is generated is also included in the region 12 including the slip band.
- FIG. 5A is enlarged. .
- a calculation method for obtaining the size of the tensile plastic deformation region 13 will be described below with reference to FIG. From the enlarged view of the thread groove portion of FIG. 5B, if the depth (distance) from the thread groove bottom of the tensile plastic deformation region 13 is r as shown in FIG. R when a tensile load is applied to the critical stress using a critical stress intensity factor Kc (described later), an elastic limit stress (a value obtained by dividing an elastic limit tensile load by an effective cross-sectional area) ⁇ l, and a circumference ratio ⁇ , Can be roughly estimated.
- the Kc can be obtained as follows from the shape of the portion where the crack occurs and the elastic limit stress ⁇ l.
- the position of the depth r of the tensile plastic deformation region 13 of the thread groove is included in the region where plastic strain is introduced by rolling and the slip band is accumulated, and it is necessary that the ductility is improved. That is, when d is the depth of the region where plastic strain is introduced by rolling, d needs to be larger than r. That is, d> r (4), that is, d> 0.022 ⁇ D (5) from the equations (3) and (4). In order to obtain a stable effect, the depth d of the region 12 including the slip band in which plastic strain is introduced by rolling processing is 1.5 times or more of this minimum value in consideration of variation and the like. Is desirable.
- the glass transition temperature varies depending on the type of bulk metallic glass, but is usually 300 ° C. or higher. Although the temperature range according to the present invention is not higher than the glass transition temperature, it is preferably performed at a temperature of 200 ° C. or lower that eliminates the need for strict thermal management, a special lubricant, and an antioxidant device in consideration of productivity. . *
- the processing speed is set in consideration of avoiding seizure between the molds on the surface and crystallization of the bulk metallic glass due to temperature rise. For example, even if it is below the glass transition temperature, if the processing speed is too high, the part to be processed becomes adiabatic and the temperature rises, and the part may crystallize and become brittle, so the strain rate is set to 100 s ⁇ 1. It is preferable to keep it below.
- the metal glass fastening screw subjected to the rolling process can determine the amorphous ratio by analyzing the microscopic structure of the thread and the screw groove that are rolled by the X-ray diffraction method (XRD).
- XRD X-ray diffraction method
- it is preferable that 50% or more of the threaded shaft portion 71 formed by rolling is amorphous. Since the screw head 41 is hardly involved in the axial force, it may be less than this.
- the fastening screw to be manufactured is a hexagon socket head cap screw (cap screw) whose size is stipulated in JIS with a crest angle of 60 degrees, and a total length of 8 mm under the neck of the screw (a thread on the entire shaft). And screws with thread grooves).
- a Zr-based bulk metallic glass Zr55Al10Cu30Ni5 (numbers indicate ratios of components) having high strength, high glass forming ability, and high impact value was used.
- This bulk metallic glass has a glass transition temperature of 410 ° C. *
- Fe group and Ni group next to it are desirable, but Fe group is brittle, and Ni group has a critical diameter (maximum diameter at which bulk metal glass becomes amorphous when cast). It is not preferable because it is small and easily crystallized.
- the Zr group has a high glass forming ability, and the tensile fracture strength is 1800 MPa, which is a sufficiently high strength for a screw.
- the elastic modulus is 90 GPa (90000 MPa), the yield strain is 2.0%, and the elastic range is large. Therefore, it is possible to realize a fastening that is difficult to loosen by using a wide range of materials, such as a low elastic modulus material such as a light metal, and a high elastic modulus material such as ceramics.
- the material is produced by casting using a bulk metal glass round bar 1 having a diameter of ⁇ 5.25 and a length of 200 mm, and then cut into a volume equivalent to the target screw. Made material 3. *
- the casting material 3 is heated to 920 ° C. by high-frequency induction heating and re-dissolved in an atmosphere replaced with argon gas after evacuation to form a mold for forming the screw head portion 41 and the screw shaft portion 42.
- the intermediate shape product 4 of the screw by casting was manufactured.
- steel having an appropriate thermal conductivity and mold life was selected as the die.
- FIG. 6 is a scanning electron microscope image of the appearance of the screw 7 that has been rolled at room temperature.
- FIG. 6A is an overall image
- FIG. 6B is an enlarged image of the threaded portion.
- FIG. 7 shows the results of an X-ray diffraction test (XRD) using Cr—K ⁇ rays.
- the vertical axis indicates the intensity of the X-ray
- the horizontal axis indicates the incident angle
- the test results of the two parts of the thread portion and the screw head are indicated as A and B, respectively.
- FIG. 8 shows the threads during the rolling process. From this, the slip band 15 is seen in a streak shape at the portion where two threads are being formed. These slip bands are accumulated in the vicinity of the thread and the groove as the rolling process proceeds, and the ductility of this portion is improved. *
- FIG. 9 shows the equivalent strain distribution of the thread cross section. Using this, it is possible to theoretically obtain the depth d of the region 12 including the slip band by introducing plastic strain by the rolling process shown in FIG. (In FIG. 3, the equivalent stress can be obtained from the contour line Q2 of 1800 MPa, but here, the equivalent strain distribution is used for easier understanding.) That is, the surface side of the screw from the contour line B in FIG. Since the equivalent strain is 0.24 or more and exceeds the elastic limit strain 0.02 of the target bulk metallic glass, it can be seen that the region is a region where plastic strain is introduced.
- the contour line B has a depth of about 0.3 mm from the screw groove, the depth d of the region 12 including the slip band is introduced at least by plastic strain, and is deeper than 0.3 mm, and is larger than 0.3 mm. You can see that it takes a value.
- d becomes four times or more than r, and d> r in equation (4), that is, the relationship of equation (5) d> 0.022D is established, so that a tensile plastic deformation portion generated when a tensile load is applied. 13 is included in the region 12 including the slip band that gives the ductility introduced by rolling, and can relieve the tensile stress generated at the bottom of the thread groove.
- FIG. 10 shows the results of the Vickers hardness test of the thread cross section.
- the vertical axis represents the Vickers hardness due to a load of 100 g
- the horizontal axis represents the depth from the bottom of the screw groove toward the center of the screw shaft in the longitudinal section of the screw.
- the measurement was performed at intervals of 0.05 mm, and a line graph as shown in FIG. 10 was drawn.
- the depth from the groove bottom decreases from 0.36 mm toward the surface, and the hardness decreases.
- the depth d of the region 12 including the slip band due to plastic strain introduced by the rolling process is obtained.
- Can be considered. This value is almost the same as the analysis result of the equivalent strain by the finite element method, and it can be seen from this result that the relationship of d> 0.022D is established.
- FIG. 11 shows a cut metal glass M3 having the same size in which a thread 7 and a screw groove are formed by cutting a screw 7 that has been rolled using bulk metal glass and an intermediate shape 4 of a screw by casting. It is the result of having done the test of the tensile breaking strength of a screw about a fastening screw.
- the tensile breaking strength of a screw is represented by a value obtained by dividing the maximum breaking load in tension by the effective sectional area of the screw (the area of a circle drawn by the diameter of (screw pitch diameter + thread groove diameter) / 2).
- the elongation of the screw (the amount of change in the length from the bottom of the screw to the nut seat until the tensile fracture occurs) is the respective magnification when the average elongation of the cut metal glass fastening screw is 1.0. Indicated.
- the cold rolled and warm rolled metal glass fastening screws exhibit 1.7 to 1.8 times the elongation of the cut metal glass fastening screws. *
- FIG. 12 shows a load-displacement diagram in a tensile test of a metallic glass fastening screw rolled at room temperature and a metallic glass fastening screw by cutting.
- the horizontal axis is the displacement in the tensile direction representing the elongation of the screw, and the vertical axis is the load at that time, and the relationship is shown when each screw is pulled until the screw breaks.
- the cutting metal glass fastening screw shown with a broken line does not have the area
- the metal glass fastening screw formed by rolling slightly deviates from linearity in the middle as the displacement increases, and exhibits a convex non-linear curve. This is because tensile plastic elongation occurred in the tensile plastic deformation portion 13 in FIG. 5B at the bottom of the thread groove, indicating that ductility as a screw appeared.
- the breaking load of the metal glass fastening screw by rolling is larger than that of the cutting metal glass fastening screw. This is because the metal glass fastening screw formed by rolling relaxes the stress concentration in the thread groove, so that it does not break suddenly like a brittle material in the middle of a straight line like a cutting screw, that is, in the middle of an elastic region. Inside the screw, the strength of the as-cast bulk metal glass is maintained, and in the vicinity of the screw thread and the screw groove, a plastic strain is introduced by rolling and an area 12 including a slip band is arranged. By imparting ductility, these work in a balanced manner and the breaking strength is improved. *
- FIG. 13 shows a comparison of the tensile rupture strength of screws with other screws in JIS M3 screws.
- the tensile rupture strengths of SUSXM7 austenitic stainless steel screw
- Hiten high tensile bolt for machine fastening
- beta titanium high strength beta titanium screw
- the metal glass fastening screws produced by rolling according to the present invention by rolling (180 ° C.) and by rolling at room temperature are shown using two samples, both of which are comparative screws. The strength is about 1.3 times higher than the highest strength high tensile screw.
- the metal glass fastening screw of this size M3 has a tensile breaking load of a screw corresponding to M4, which is a screw size that is almost one higher in Hi-Ten. *
- the cut metal glass fastening screws showed a variation in the tensile break strength within a range of about 15% of the average tensile break strength.
- the metal glass fastening screw by rolling was as small as 3%. This indicates that in the metal glass fastening screw produced by rolling, the ductility of the thread groove portion is improved, the stress concentration is relaxed, and the breaking load is stabilized.
- the metal glass fastening screw formed by rolling at a temperature lower than the glass transition temperature has a larger tensile break strength than that of other high-strength screws, and has a bulk metal glass. Since it has the characteristic of large elastic limit strain, the axial force is stable, the contact area with the fastened body increases, and the frictional force increases. By improving the ductility, the stress concentration in the thread groove is relaxed and stable strength can be maintained, so that a highly reliable fastening screw is provided.
- Ceramics are used as members in high-speed processing machines, around water, and in corrosive environments, and this contributes widely to the industry by realizing metal glass fastening screws that do not easily loosen against these members.
Abstract
Description
スの引張り破断強度の3分の1以下の引張り応力で、転造加工により成形される金属ガラス締結ねじの製造方法である。
て、金型のねじ溝を転写して完成させる加工方法であるため、転造加工が進行する毎に塑性ひずみが導入されてすべり帯が蓄積して、バルク金属ガラスの延性が改善され、変形能力が向上したことも、その要因の一つと考えられる。
転造加工を完了したねじ7は、各部の寸法測定によりすべて規格内にあることを確認した。
Claims (6)
- ねじのねじ山及びねじ溝の加工において、非晶質からなるバルク金属ガラスを、被加工材であるバルク金属ガラスのガラス転移温度以下で、転造加工により成形することを特徴とする金属ガラス締結ねじ。
- 転造加工により塑性ひずみが導入される領域のねじ溝の底からの深さをdとし、 ねじ外径をDとしたとき、d>0.022×Dの関係にあることを特徴とする請求項1に記載の金属ガラス締結ねじ。
- ねじ山角が40~70度の範囲にある三角ねじであることを特徴とする請求項1または請求項2に記載の金属ガラス締結ねじ。
- 前記バルク金属ガラスは、Ti基,Pd基、又はZr基のうち少なくとも一つを含むことにより、生体用に使用されることを特徴とする請求項1に記載の金属ガラス締結ねじ。
- 前記バルク金属ガラスは、降伏点が低く、弾性率の低い被締結材を締結する場合は、締結時に、被締結材の永久ひずみ(陥没)によるゆるみを防止するために、被締結材と同等もしくは低い弾性率を有するMg基、Pt基、Ti基,Zr基の何れかを含むことを特徴とする請求項1又は請求項4に記載の金属ガラス締結ねじ。
- 前記バルク金属ガラスの塑性変形を生じる領域の平均応力が圧縮応力であるか、又は前記バルク金属ガラスの引張り破断強度の3分の1以下の引張り応力で、転造加工により成形される請求項1、請求項4、又は請求項5の何れかに記載の金属ガラス締結ねじの製造方法。
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP10843906.8A EP2527059B1 (en) | 2010-01-22 | 2010-06-22 | Metallic glass fastening screw and its method of manufacturing |
KR1020127018104A KR101718179B1 (ko) | 2010-01-22 | 2010-06-22 | 금속유리 체결 나사 |
US13/574,498 US9095890B2 (en) | 2010-01-22 | 2010-06-22 | Metallic glass fastening screw |
CN201080062161.3A CN102844130B (zh) | 2010-01-22 | 2010-06-22 | 金属玻璃紧固螺丝及其制造方法 |
Applications Claiming Priority (4)
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JP2010011544 | 2010-01-22 | ||
JP2010-011544 | 2010-01-22 | ||
JP2010065872A JP4783934B2 (ja) | 2009-06-10 | 2010-03-23 | 金属ガラス締結ねじ |
JP2010-065872 | 2010-03-23 |
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US (1) | US9095890B2 (ja) |
EP (1) | EP2527059B1 (ja) |
JP (1) | JP4783934B2 (ja) |
KR (1) | KR101718179B1 (ja) |
CN (1) | CN102844130B (ja) |
WO (1) | WO2011089742A1 (ja) |
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CN102844130B (zh) | 2015-04-01 |
JP4783934B2 (ja) | 2011-09-28 |
KR20120130085A (ko) | 2012-11-28 |
EP2527059A1 (en) | 2012-11-28 |
EP2527059B1 (en) | 2020-12-09 |
JP2011169458A (ja) | 2011-09-01 |
EP2527059A4 (en) | 2017-07-26 |
US9095890B2 (en) | 2015-08-04 |
CN102844130A (zh) | 2012-12-26 |
KR101718179B1 (ko) | 2017-03-20 |
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