WO2009130776A1

WO2009130776A1 - Small-size precision bent tube joint and assembly for reducing sum total of specific environmetal load, process for producing the small-size precision bent tube joint and assembly, and mold and working machine for execution of the process

Info

Publication number: WO2009130776A1
Application number: PCT/JP2008/057939
Authority: WO
Inventors: 康幸尾崎
Original assignee: 木村洋一; 渡辺崇記
Priority date: 2008-04-24
Filing date: 2008-04-24
Publication date: 2009-10-29
Also published as: WO2009131253A1; KR20110016869A; KR101613326B1

Abstract

An object of the present invention is to provide a metal bent tube joint and assembly for use in pipe connection and a process for producing the metal bent tube joint and assembly and to reduce the sum total of a specific environmental load in the life cycle of the metal bent tube joint and the assembly by optimizing a mold and a working machine for the execution of the process. The bent tube joint is used in a pressure piping circuit for forcibly feeding a pressure fluid. Regarding the material for the bent tube joint, the bent tube joint having a hollow conduit is formed of a hard base metal material composed mainly of a metallic element which has a lower density than the sulfide mineral deposit-type metal and has a larger Clarke number or a larger recycle ratio as compared with the sulfide mineral deposit-type metal.

Description

Small precision curved pipe joint and assembly for reducing the total sum of specific environmental loads, manufacturing method thereof, mold and processing machine used for the implementation

The present invention relates to a metal pipe fitting (= Metal Fittings) technology for connecting pipes, and in particular, is combined with a small precision curved pipe joint used in the field of transportation equipment and industrial machinery having a pressure pipe circuit for pumping a pressurized fluid. The present invention relates to a technology for reducing a total sum of specific environmental loads related to a three-dimensional object, a manufacturing method thereof, and a mold and a processing machine used in the method.

The above-mentioned total environmental impact is the 3rd Kyoto Conference of the Parties to the Framework Convention on Climate Change (COP3) Kyoto Protocol (the Kyoto Protocol to the United Nations Framework)
Environmental load caused by the use and discharge of 6 global warming gases (CO ₂ , HFC / PFC, etc., CH _4, SF ₆ , N ₂ O) specified by the Convention on Climate Change) and the World Health Organization (WHO) The above-mentioned conventional metal pipe joint technology is disclosed in, for example, Patent References 1 to 5, including the environmental load and the like caused by harmful substance contamination classified by the Cancer Research Institute (IARC).

The above-mentioned patented technology includes a metal pipe joint connection structure, a bending method for the pipe material for the metal pipe joint, a heating method at the time of the bending process, and foreign matter contamination (= contamination) suppression in the hollow pipe of the metal pipe joint. Or a partial improvement technique that attempts to improve only the limited parts such as the brazing method of metal pipe joints that commonly use brazing materials containing harmful components such as cadmium (Cd) and lead (Pb). Thus, throughout the life cycle of the metal pipe joint and the assembly using the joint, resource energy consumption and harmful substance contamination are reduced as a whole, and the total of specific environmental loads associated with the resource energy consumption and harmful substance contamination is reduced. It was hard to say that it was going to be reduced.

For example, the material used for the metal pipe joint has a low smelting temperature of the metal resources, but the smelting temperature is low. Both are roughly classified into high oxide ore-based metals, but the former has a large environmental impact due to resource consumption and ore / sulfur gas emissions from the ore from which the metal is extracted, while the latter is a reduction smelting of oxide ore. The environmental load due to the large consumption of energy is enormous, and a metal pipe joint made of such a metal material is required to have a technique for reducing the total environmental load described above.

Also, the metal bent pipe joint manufacturing method employs a forming method in which a large amount of force / heat energy is input and a metal tool or a die is frequently used as a tool for imparting a shape to a metal material. Since the forming method is a form of processing between metals that are both elastoplastic, it is difficult to avoid quality degradation such as metal adhesion caused by plastic deformation heat generation, friction heat generation, etc., which is an interaction between the metals. In addition, as described in Patent Reference 4, quality deterioration such as metal burrs, plastic deformation, compression fracture surfaces, residual strain stress, etc. has occurred in the metal bent pipe joint of the workpiece.

The quality deterioration may be caused by maximizing physical loss such as pressure loss, leakage loss, heat transfer loss, etc. of the metal bent pipe joint, energy input by electromagnetic induction heating described in Patent Reference 3, or carcinogenic amine / Mo For example, a large amount of cooling lubricant liquid containing harmful substances such as The conventional use of the cooling lubricant liquid invites the use of the alternative chlorofluorocarbon cleaning solvent for removing the cooling lubricant liquid, and in addition to CO ₂ emission accompanying mass consumption of the force / thermal energy and the electromagnetic induction energy, A large amount of the substitute chlorofluorocarbon was used and discharged, and the total discharge amount of the six gases increased exponentially.

In particular, regarding the problem of reducing emissions of alternative chlorofluorocarbons, Non-Patent Document 1, for example, states that “Global environmental problems are inappropriate for measures that can only be applied to specific fields while increasing the environmental burden in other fields. It is necessary for countries to follow the path of HFC conversion like developed countries and not to select HFC from the beginning so that they will not be forced to bear a heavy burden on de-HFC in a few years. In the metal parts technology where international parts procurement is rapidly developing, the use of harmful substances resulting from the pursuit of cost productivity of metal parts is abolished. At the same time, there was a strong social demand for technological innovation to reduce the total amount of resource energy and alternative CFC cleaning solvent used.

Japanese Patent Publication No.7-35873 Japanese Patent No. 3936592 Japanese Patent No. 3737951 Japanese Patent No. 3599227 Japanese Patent No. 3521071

In view of the above-mentioned background art, the present invention reduces the overall consumption of resource and energy and pollution of harmful substances generated from a metal bending pipe joint and assembly used for pipe connection and a manufacturing method thereof, a die used for the implementation, and a processing machine. An object of the present invention is to reduce the sum of specific environmental loads in the life cycle of the metal bent pipe joint and the assembly.

In order to solve the above-described problems, the present invention reduces resource energy consumption and harmful substance contamination as a whole by using each means described below.
That is, the invention according to claim 1 is a metal bent pipe joint used for pipe connection, and the material of the bent pipe joint has a density lower than that of the sulfide deposit metal and the sulfide deposit system. It is a hard base metal material whose main component is a metal element having either a large number of Clarkes or a large recycle rate compared to metal, or the hard base metal material has a higher specific strength than the base metal. And, it is a reinforced alloy material in which the material characteristics are strengthened by adding any alloy element having a large specific heat or a large magnetic susceptibility compared to the base metal,
Or, as the metal bent pipe joint, any of the safety type alloy materials from which harmful components of the reinforced alloy material are removed to an inevitable component ratio or less,
The metal bent pipe joint is formed of any one of the hard base metal material, the reinforced alloy material, and the safety alloy material, and has a shape including a hollow pipe passage of the bent pipe joint, Alternatively, it is a straight pipe material obtained by plastically processing any one of the above materials, and a small pipe precision and a curved pipe section in which a pressurized fluid smoothly flows through the hollow pipe path. It is a curved pipe joint.

The invention according to claim 2 is the small precision curved pipe joint according to claim 1, wherein the small precision curved pipe joint is at least part of the surface of the small precision curved pipe joint. It is characterized in that a passive film in which elements are covalently bonded, other smooth metal rust preventive film, or a harmless rust preventive film in which harmful components of each of the coating materials are removed to a ratio below the inevitable component ratio is formed. The small precision bend pipe joint according to claim 1.

The invention according to claim 3 is a small precision curved pipe joint in which a straight pipe part and a curved pipe part are formed of the straight pipe material according to claim 1, wherein the small precision curved pipe joint is a pipe shaft of the straight pipe material. A straight pipe portion extending in parallel to the straight pipe portion and a curved pipe portion whose tube axis is bent in a smooth curve, and the surface roughness in the vicinity of the straight pipe portion is smaller than that of the outer wall surface of the straight pipe, or Forming one or more elements of a welding joint surface having a small coefficient of friction, a sealing body housing pressing groove, a close fitting sheet surface, a screwing portion, or a precision outer diameter portion for sealing; or The small precision curved pipe joint according to claim 1 or 2, wherein a two-surface width part for engaging the small precision curved pipe joint mounting tool is formed in the vicinity of the curved pipe part.

The invention according to claim 4 is the small precision curved pipe joint according to any one of claims 1 to 3, wherein the small precision curved pipe joint is arranged around the straight pipe portion of the small precision curved pipe joint. 4. A sealing body having an elastic limit larger than the portion, or a flat tight fitting washer that tightly fits the precision outer diameter portion and presses the sealing body around the precision outer diameter portion according to claim 3. The small size according to any one of claims 1 to 3, wherein at least one element of a screwing nut that is screwed into the screwing part and presses the tight fitting washer is attached to the screwing part. It is a precision bend pipe joint.

According to a fifth aspect of the present invention, there is provided an assembly comprising a pressure piping circuit using the small precision bend pipe joint according to any one of the first to fourth aspects, wherein the assembly is attached to a part of the pressure piping circuit. The small precision curved pipe joint according to any one of Items 1 to 4, the element according to any one of Claims 3 or 4, the other pipe connection member that does not contain harmful components, or the harmful component ratio of inevitable components An assembly comprising a pressure piping circuit, characterized in that a total of specific environmental loads due to the small precision curved pipe joint and the pressure piping circuit is reduced by connecting using the pipe connecting member removed below.

The invention according to claim 6 is the method of manufacturing a small precision curved pipe joint according to any one of claims 1 to 4, wherein the manufacturing method uses the straight pipe material according to claim 1 as a workpiece, and the workpiece A first step of cutting the material to form a precision end face without post-finishing, pressing at the middle between the two points while constraining at least two points including the precision end face; A second step of forming a smooth curve and at the same time reinforcing and bending the tube flesh, and pressing the outer wall surface of the straight pipe so as to suppress a reduction in the cross-sectional area of the pipe A third step, a fourth step of forming the two-surface width portion according to claim 3 on a part of the outer wall surface of the straight pipe material by plastic working, and a gold comprising any one or more of the first to fourth steps A fifth step of pressing using a mold, and at least one of the first to fifth steps is processed at a processing speed. Elastoplastic wave or propagation speed more, or a small precision bent tube fittings manufacturing method which is characterized in that high-speed plastic working close to the elastic-plastic wave propagation velocity.

The invention according to claim 7 is the mold used in the manufacturing method according to claim 6, wherein the mold is a fixed mold for restraining and fixing the workpiece, and the workpiece is cooperating with the fixed mold. A movable mold that forms the straight pipe section and the curved pipe section described above, a pair of press dies having a main part such as a rigid holding section that holds the fixed mold and the movable mold with high accuracy, and at least A part of the constituent material of the main part may be a high-rigidity material having a smaller density than a high-rigidity heavy metal and having a large specific rigidity or a large specific heat as a main component, or the high Comprising a harmless high-rigidity material in which harmful components of the rigid material are removed to an inevitable component ratio or less, at least a part of the surface where the mold is in pressure contact is compared with the non-pressurized contact surface of the mold, Finish with a surface with a characteristic of either low surface roughness or low friction coefficient At least a part of the surface to which the mold is in pressure contact, a characteristic film having either a high hardness, a small surface roughness, or a low coefficient of friction compared to the non-pressurized contact surface of the mold, or Form a harmless characteristic film by removing harmful components of the characteristic film below the inevitable component ratio, or coat the characteristic film on the characteristic surface to increase the plastic working speed of the press die. A small precision press die used for carrying out the manufacturing method according to claim 6.

The invention according to claim 8 is the press machine used in the manufacturing method according to claim 6, wherein the press machine is a fixing part for mounting the fixed die of the small precision press die according to claim 7, and the press die. And a movable part that reciprocates between the upper and lower dead centers together with the movable mold, and is configured in an automatic press machine including main parts such as a pressure rigid frame part that drives and pressurizes the movable part to hold rigidity. A part of the constituent material of the main part is made of any of the high-rigidity materials according to claim 7, or at least a part of the surface to which the automatic press machine is brought into pressure contact is selected. The characteristic surface is finished, or at least a part of the surface to which the automatic press machine is in pressure contact is coated with any of the characteristic films according to claim 7, or the characteristic surface is coated on the characteristic surface. Forming a characteristic film, The plastic working rate of small precision press die is small precision automatic press machine used in the production method according to claim 6, characterized in that speed.

The invention according to claim 9 is the small precision curved pipe joint according to any one of claims 1 to 4, wherein the small precision curved pipe joint is a manufacturing method of the small precision curved pipe joint according to claim 6. A small precision curved pipe joint is manufactured by applying one or more of the small precision press die according to claim 7 or the small precision automatic press machine according to claim 8, and the small precision curved pipe joint and the manufacturing process. This is a small precision bend pipe joint that is characterized by reducing the total sum of specific environmental loads.

The invention according to claim 10 is an assembly comprising the pressure piping circuit according to claim 5, wherein the assembly is the small precision curved pipe joint according to claim 9 in a part of the pressure piping. 5. An assembly comprising a pressure piping circuit connected by any one of the assembly methods described in 5, wherein a total sum of specific environmental loads caused by the small precision curved pipe joint and the pressure piping circuit is reduced. .

Advantages of the Invention of Claim 1 First, the metal terms relating to the material of the bent pipe joint 10 according to claim 1 and explanation of its operation will be started. The density shown in FIGS. 2 (A) to 2 (C) is the mass per unit volume, and the metal element having a density smaller than Pb of the sulfide ore-based metal is the motion of the bent joint 10 made of the metal ( (Moving) loss and resource energy consumption required for metal processes such as transport of ore for extracting the metal. The number of Clarke is an indicator of the crustal abundance that expresses the proportion of elements present near the ground surface in weight percent. The metal element with a Clark number greater than Pb is the ore exploration, mining, beneficiation, and other ores. Reducing the energy consumption of resources required for the treatment process, the recycling rate is the amount of (recycled + waste-waste for recycling) in the metal material manufacturing process (crude metal + recycling + waste-waste for recycling + smelting) The metal element having a recycling rate larger than the Pb has an action of suppressing resource energy consumption required for the smelting process of the metal.
Therefore, a base metal material mainly composed of a metal element having a low density and a large number of Clarkes or a large recycling rate as compared with the Pb has the effect of suppressing the loss and the resource energy consumption. This has the effect of reducing the sum of specific environmental loads due to the loss and the consumption.

Further, the specific strengths shown in FIGS. 3 (A) to 3 (D) are indexes for reducing the size and weight of a rigid body obtained by dividing mechanical strength by density. The function of further simplifying the design and further suppressing the movement (movement) loss of the bent pipe joint 10 using the material and the resource energy consumption of the material itself, the specific heat is a heat insulation index indicating the heat capacity per unit mass. The material having a specific heat larger than that of the base metal acts to suppress the heat transfer loss of the bent pipe joint 10, and the magnetic susceptibility corresponds to the magnetic permeability indicating the ease of transmission of the magnetic flux. The material is made by reducing the depth of the skin effect heating layer according to the following (Equation 1) at the time of the electromagnetic induction heating insulation of the bent pipe joint 10 so that the skin effect layer reaches the maximum temperature first, and the electromagnetic induction heating energy consumption is reduced. Inhibiting action, removing harmful components identified by IARC And the material acts to suppress harmful contamination of the life cycle of the bent tube joint 10, there respectively.
(Equation 1)
δ = (2 / ωμσ) ^0.5
Where δ is the skin effect heating layer depth, ω is the frequency of the electromagnetic wave, σ is the current density, and μ is the magnetic permeability corresponding to the magnetic susceptibility.
Therefore, the bent pipe joint 10 using the reinforced alloy material having a high specific strength and high specific heat or a metal element having a high magnetic susceptibility as compared with the base metal has the loss and the consumption. Further, the bent pipe joint 10 using the safe type alloy material excluding the harmful components of the alloy material has the effect of suppressing the harmful substance contamination, and the bent pipe joint 10 using the material. There is an effect of reducing the sum of specific environmental loads due to the loss, consumption, and pollution of the product.

In addition, waste saving in the process of forming the traditional manufacturing method according to the embodiment of claim 1 is an effect to reduce the consumption of resource energy, and separation and recycling of metal processing waste increases the recycling rate of the metal material to produce the metal material. Has the effect of reducing resource energy consumption due to the energy consumption, and has the effect of suppressing the sum of specific environmental loads due to each resource energy consumption.

Furthermore, the straight pipe material in which the hollow pipe 12 according to the embodiment of claim 1 is primarily formed enhances the mechanical strength as a structural material by means of a large second moment of section per unit mass as compared with a solid material. In addition, there is an effect of suppressing the flow resistance loss of the fluid flowing in the pipe line by the machining trace parallel to the pipe axis, and the straight pipe part 13 and the curved pipe part 14 that are formed secondarily have the secondary moment of section. To further reduce the physical loss including at least the motion loss due to the reduction in size and weight, and to reduce the cutting burr and the cross burr in the hollow pipe 12. And the effect of reducing the pressure loss of the curved pipe joint 10 by suppressing the possibility of contamination with other foreign matters (= commonly called “contamination”). The small precision curved pipe joint 10 thus formed is After-treatment process Remarkably reduce resource energy consumption required for the separate regeneration process and reduce the sum of the loss, resource energy consumption and specific environmental load due to contamination of harmful substances in the life cycle of the small precision bend joint 10 effective.

Effect of Invention of Claim 2 The stress corrosion cracking in the life cycle of the small precision bend joint 10 by comprehensively suppressing the stress corrosion cracking, corrosion disappearance, harmful substance contamination and the like according to the embodiment of claim 2. There is an effect of reducing the sum of specific environmental loads caused by accidents and disappearance / contamination.

Effect of Invention of Claim 3 By suppressing the flow resistance loss / pressure loss and the leakage loss / friction loss accompanying connection / engagement according to the embodiment of claim 3, the connection / There is an effect of improving the engagement accuracy and suppressing the energy consumption of the connection / engagement work and reducing the total sum of the specific environmental loads due to the losses and the consumption in the life cycle of the small precision bend joint 10.

Effect of Invention of Claim 4 By suppressing the sum of physical losses described in the embodiment of claim 4, there is an effect of reducing the sum of specific environmental loads associated with the loss of the small precision bend joint 10. is there.

The effect of the invention of claim 5 The small precision bend pipe joint 10 according to any one of claims 1 to 4 is attached to a part of the pressure piping circuit 100 provided in the assembly 200 according to claim 5 according to the embodiment of claim 5. By connecting and using as described, there is an effect of reducing the sum of specific environmental loads in the life cycle of the small precision bend pipe joint 10 and the pressure piping circuit 100.

Effect of the Invention of Claim 6 The material-strengthened bending process described in the embodiment of the second step 60e according to claim 6 is performed by adding 25 to 50% of the material-strengthened portion as shown in the evaluation result of FIG. For example, the pipe wall 11 of the bent pipe joint 10 can be designed to be thinned to form the pipe end part 11t. By reducing the thickness, the material consumption amount and the motion loss can be reduced and the pipe end part 11t can be disturbed. There is an effect of reducing the pressure loss by suppressing the flow.
Further, by manufacturing the bent pipe joint 10 by the high-speed plastic processing method described in the embodiment, the energy consumption of the manufacturing process can be reduced, and at the same time, the processing quality can be drastically improved. It is possible to abolish the use and discharge of lubricant liquids, alternative chlorofluorocarbon cleaning solvents, or the above-mentioned post-treatment for reforming, and there is a remarkable effect of reducing the total of specific environmental loads due to the respective mitigation and abolition of the suppression .

Advantages of the Invention of Claim 7 The reduction of distortion loss, motion loss, heat transfer loss, and harmful substance contamination of the press die 70 described in the embodiment of claim 7 is achieved by reducing the press die 70 in size and weight. It has the effect of saving energy consumption of the processing machine 80 that pressurizes the mold 70 and increasing the plastic processing speed of the small precision press mold 70 to dramatically improve the press processing quality. The post-treatment for reforming, the cooling lubricant solution, and the use and replacement of the alternative chlorofluorocarbon cleaning solvent, which have been conventionally used, are suppressed and abolished, and the effect of reducing the energy consumption and the specific environmental load associated with the use and discharge is reduced. is there.

Further, the reduction of friction loss, wear loss, and harmful substance contamination of the press die 70 described in the above embodiment has an effect of supporting further increase in the plastic working speed, and has the effect of further enhancing the above effect. .

Advantages of the Invention of Claim 8 The small precision automatic press machine 80 described in the embodiment of claim 8 reduces strain loss, motion loss, heat transfer loss, friction loss, wear loss, and harmful substance contamination. The automatic press machine 80 is reduced in size and weight, and the pressure energy consumption of the press machine 80 is saved, and the plastic processing speed of the small precision press die 70 is increased to dramatically improve the press work quality. Yes, the use of the post-reforming for reforming, which has been conventionally used in press processing, the cooling lubricant liquid, and the use and discharge of the alternative CFC cleaning solvent are suppressed and abolished, and the total environmental load associated with the energy consumption and the use discharge There is an effect of reducing.

The effect of the invention of claim 9 The manufacturing method 60 of the small precision curved pipe joint 10 according to claim 4 described in the embodiment of claim 9, the small precision press die 70 according to claim 5, or the claim 6. The small precision curved pipe joint 10 is manufactured by applying any one or more of the above small precision automatic press machines 80, thereby reducing the total environmental load caused by the small precision curved pipe joint 10 and the manufacturing process 60. There is an effect to.

The effect of the invention of claim 10 The small precision bend pipe joint 10 of claim 9 is connected to a part of the pressure piping circuit 100 provided in the assembly 200 of claim 10 as described in the embodiment of claim 5. By using them, there is an effect of reducing the total sum of specific environmental loads in the life cycle of the small precision bend pipe joint 10 and the pressure piping circuit 100.

FIG. 1 (A) is a schematic cross-sectional explanatory view illustrating a first embodiment of a small precision bend pipe joint of the present invention. FIG. 1B is an external perspective view illustrating a second embodiment of the small precision bend pipe joint of the present invention. FIG. 1 (C) is an external front view illustrating a third embodiment of the small precision curved pipe joint of the present invention. FIG. 1D (D) is an external front view illustrating a fourth embodiment of the small precision bend pipe joint of the present invention. FIG. 1E is a schematic cross-sectional explanatory view for explaining a connection structure of a fourth embodiment of the small precision bend pipe joint of the present invention. FIG. 2 is a metal element characteristic chart used for material design of the small precision bend pipe joint of the present invention. FIG. 2A is a density ranking graph of candidate metal elements used for material design of the small precision bend pipe joint of the present invention. FIG. 2 (B) is a graph of Clark number ranking of candidate metal elements used for material design of the small precision bend pipe joint of the present invention. FIG. 2 (C) is a graph showing the recycling rate ranking of candidate metal elements used in the material design of the small precision bend pipe joint of the present invention. FIG. 3 is a characteristic chart of candidate additive elements used for alloy design of the material for small precision bend pipe joints of the present invention. FIG. 3 (A) is a specific strength ranking graph of candidate additive elements used in the alloy design of the material for small precision bend pipe joints of the present invention. FIG. 3 (B) is a specific heat rank graph of candidate addition elements used for alloy design of the material for small precision bend pipe joints of the present invention. FIG. 3 (C) is a magnetic susceptibility ranking graph of candidate additive elements used in the alloy design of the material for the small precision bend pipe joint of the present invention. FIG. 3 (D) is a classification table of harmful element substances that are candidates for exclusion used in the alloy design of the material for small precision curved pipe joints of the present invention. FIG. 4 (A) is a flowchart for explaining a method for manufacturing a small precision bend pipe joint of the present invention. FIG. 4B is an evaluation result of a cold bending plastic working experiment of the manufacturing method of the small precision bend pipe joint of the present invention. FIG. 5A is a schematic cross-sectional explanatory view of a mold used for carrying out the manufacturing method of the present invention, and shows an open state in the vicinity of the top dead center of the bending press mold. FIG. 5B is a schematic cross-sectional explanatory view of a mold used for carrying out the manufacturing method of the present invention, and shows a closed state near the bottom dead center of the bending press mold. FIG. 6 is a schematic cross-sectional explanatory view of a processing machine used for carrying out the manufacturing method of the present invention. FIG. 7 is a characteristic chart of candidate metal elements used for material design of the mold / processing machine component of the present invention. FIG. 7A is a density ranking graph of candidate metal elements used for material design of the mold / processing machine component of the present invention. FIG. 7B is an elastic constant ranking graph of candidate metal elements used for material design of the mold / processing machine component of the present invention. FIG. 7C is a graph of specific rigidity ranking of candidate metal elements used for material design of the mold / processing machine component of the present invention. FIG. 7 (D) is a specific heat rank graph of candidate metal elements used for material design of the mold / processing machine component of the present invention. FIG. 8 is a surface characteristic chart used for the surface design of the mold / processing machine of the present invention.

Explanation of symbols

10. Small precision curved pipe joint 10a according to the present invention Rust-preventing coating 10b formed on the surface of the curved pipe joint 10b Precision end face 10c Straight pipe workpiece (intermediate material with precision end face)
11 Tube wall 11t Tube wall end portion 12 where fluid is turbulent and pressure loss is likely to occur 12 Hollow pipe 12a Pipe axis vertical cross-sectional area 13 Straight tube section 13a Weld joint surface (for connecting joint 10) Element 1)
13b Concave groove for accommodating seal body pressing (element 2 for connection of joint 10)
13c Close-fitting sheet surface (element 3 for connecting the joint 10)
13d Screwed portion (element 4 for connecting the joint 10)
13e Precision outer diameter part for sealing (element 5 for connection of the joint 10)
14 Curved pipe portion 14a Smooth curve 14in Tube wall 14out inside smooth curve 14a Tube wall 14b outside smooth curve 14a Two-face width portion for fitting tool engagement of joint 10 (front side)
14c Two surface width part (back side) for engaging tool of fitting 10
20 Pumped vector 20a of a fluid to be pumped through the hollow pipe 12 Smooth pumped vector 30 Seal body (element 6 for connection of the joint 10)
40 Flat tight washer (element 7 for connection of the joint 10)
50 threaded nut (element 8 for connection of the joint 10)
60 Manufacturing method 60a of the bent pipe joint 10a Step 60b for cutting the straight pipe material to form a precision end face 60b Step for bending the straight pipe work material and strengthening the material 60c Step 60d for forming the material while suppressing the reduction of the pipe cross-sectional area Step 60e 60a to 60d for plastic working of the two-surface width portion Pressing using a mold including any one or more of the steps 60e 60a to 60d Step for increasing the plastic working speed of any one or more of the steps 60a to 60e 70 Small Precision Press Die 71 of the Present Invention Fixed Die Assembly 71a Die / Tool, Die / Tool Holder, Die Plate, etc. 72 Movable Die Assembly 72a Punch / Tool, Punch / Tool Holder, Punch Plate, Movable Stripper, etc. 73 Rigid Holding Section (Die set, guide post, etc.)
74 Pressure contact surface of the same press die (stripper surface, punch blade tool surface, die blade tool surface, guide post surface, guide bush surface, copying sliding surface, etc.)
75 Pressing vector 80 of the same press mold Small precision automatic press machine 81 of the present invention 81 Fixed part (bolster or the like)
82 Moving parts (slides, etc.)
83 Pressurized rigid frame portion 83a Rigid frame, slide guide, etc. 83b Crank rotating shaft, etc. 83c Connecting rod, etc. 84 Pressurizing contact surface of the press machine (slide surface, slide rigid guide surface, crank rotating shaft surface, connecting rod surface, etc. )
85 Pressure Vector 100 of the Press Machine Pressure Pipe Circuit 200 Using Pipe Joint 200 Assembly with Pressure Pipe Circuit

The embodiment of the present invention will be described with reference to FIGS. 1 to 8, but it will be the best mode description for the sake of convenience. Therefore, the description should not be construed as limiting the claims.

The invention described in claim 1 is a small precision curved pipe joint 10 having a hollow pipe 12 for pumping a fluid to be pressurized, as illustrated in FIGS. 1 (A) to 1 (D). As shown in FIGS. 2 (A) to 2 (C), the following materials can be used for the material for 10.
The first of these materials has a lower density than lead (Pb), a sulfide ore metal commonly used for its low melting point and formability, despite its small crustal abundance, as described in Note 3) in Figure 2. And having a Clarke number greater than Pb, such as aluminum (Al), magnesium (Mg), titanium (Ti), iron (Fe), copper (Cu), etc., or nickel (Ni) with a recycle rate greater than Pb Select a base metal material (base metal) whose main component is any metal element such as Al, Ti, Cu, Fe, etc., preferably oxides and carbides in which the base metal is ionically bonded Hardening by selecting a hard base metal material, such as (Carbide), nitride (Nitride), silicide (Silicide), etc., or amorphous, etc. that exhibits unique physical properties. Reflecting the amount in the design for reducing the size and weight of the bent pipe material 10, the material consumption for the joint is suppressed. Together, it can be implemented to reduce the resources and energy consumption required for material production.

3A to 3C, an alloying element having a specific strength greater than that of the base metal and either a large specific heat or a large magnetic susceptibility is added to the base metal material. Thus, it is desirable to select a strengthened alloy material in which the physical characteristics of the material are reinforced, and to carry out the process while reducing the loss of the physical characteristics in addition to the miniaturization and weight reduction design. Specifically, when the base metal is Al, Be, Mg, Cr, Ti, Mo, Ni, W, Fe, Cu, etc. having a specific strength greater than the Al, Be, Mg, etc. having a specific heat greater than the Al, Candidate targets are alloy element groups such as Fe, Ni, Pd, Cr, Ti, and Mo having a magnetic susceptibility greater than that of Al. When the base metal is Fe, Be, Mg, Cr, Ti, Mo, Ni, W, etc. having a specific strength greater than the Fe, Be, Mg, Al, Ti, Cr, Ni, etc. having a specific heat greater than the Fe are candidates. The target (there is no magnetic susceptibility greater than the Fe). When the base metal is Cu, Be, Mg, Cr, Ti, Mo, Ni, W, Fe, etc. having a specific strength greater than Cu, Be, Mg, Al, Ti, Cr, Ni, specific heat greater than Cu Fe and the like are candidates, for example, Be-Al alloy, Al-10% Si-2% Mg, Al-5% Li, Mg-Al-Zn alloy, Mg-2% Al-Pd alloy, Ti -5% Al-1% Mo, Fe-2% Si alloy, Fe-Cr-Ni alloy, Fe-C-Pb alloy, Cu-Zn-Pb alloy, Cu-3% Ti alloy, etc. Select a strong alloy material.

Further, as shown in FIG. 3D, the commercially available high-strength alloy materials include Be and Be compounds, cadmium (Cd) and Cd compounds, hexavalent Cr compounds, Ni compounds, inorganic lead (Pb) compounds, cobalt (Co ), Harmful components such as Pb, metal Co, metal Ni, etc. are intentionally or unintentionally contained. Therefore, select a safe type alloy material in which the harmful components are inevitably less than or equal to the inevitable component ratio. Environmental pollution can be suppressed and implemented. In particular, Pb components contained in free-cutting steel and free-cutting brass, Co components intended to improve intermetallic reactivity, and harmful components such as Pb, Cd and arsenic (As) that are easily contained in sulfide ore-based ores are unavoidable. Select a base metal material that has been removed to a component ratio or less, or an oxide-based deposit base metal material that does not contain from the beginning, and not only suppress environmental pollution by the harmful components, but rather reduce the recycling rate of the base metal material. It is important to improve and reduce the total environmental impact.

Specifically, a metal element such as Al, Mg, Ti, Fe, or Cu is used as a base metal (base metal material), and the alloy elements Mg, Ti, Mo, W, Fe, Pd, etc. are added to the base metal. However, the main component is not limited to the alloy element, but is mainly composed of a hard intermetallic compound (Metal-Compound) in which the elements are ion-bonded to each other, such as Al alloy and Mg alloy of high specific strength alloy material. High-strength materials such as ultra-duralumin and high-strength Ti alloys, such as high-strength magnetic materials such as electromagnetic steel and maraging steel using alloy phase transformation reaction, amorphous materials that have been specially characterized by rapidly solidifying molten metal, A dispersion strengthened alloy material or the like in which the crystal quality is uniformly dispersed is selected, and the material consumption, the resource energy consumption, the loss, and the harmful substance contamination are comprehensively suppressed.

The shape of the curved pipe joint 10 having the hollow pipe 12 made of any one of the hard base metal material, the reinforced alloy material, and the safety alloy material is, for example, MIMS (Metal Metal Injection Mold) or the like. For example, as shown in FIG. 1A, it can be carried out by a traditional manufacturing method such as a die casting method, a hot-warm die forging method, or a machining method such as cutting and grinding. However, the traditional manufacturing method requires a large amount of power and thermal energy in the formation process, and at the same time, quality deterioration such as surface roughening due to cast forging burrs, cast forging, cutting burrs, cross burrs, residual strain stress due to processing tools, etc. In addition, it is difficult to avoid a large amount of metal processing waste. Therefore, in this case, the post-processing step for reforming such as shot blasting and shot peening treatment, post-correction finishing finishing additional processing, or strain relief annealing heat treatment required for the improvement of the quality deterioration, and separation of the metal processing scrap It is important to save resources energy consumption, such as energy consumption required for the regeneration process, as much as possible.

Preferably, any one of the above materials is subjected to, for example, extrusion / pulling plastic processing, and a hollow pipe 12 having a large moment of inertia per unit mass compared to a solid material is formed, and the processing trace is parallel to the tube axis. Thus, it is desirable to apply the straight pipe material formed primarily. With the straight pipe material, as shown in FIG. 1 (B), a straight pipe section 13 and a curved pipe section 14 through which the fluid under pressure flows smoothly through the hollow pipe passage 12 are secondarily formed, and the force / heat In addition to saving a large amount of energy input and reducing the inherently wasteful resource energy consumption, the increase in the secondary moment of the cross section is reflected in the design for reducing the size and weight of the straight pipe material and the bent pipe joint 10, The material consumption at the time of manufacturing the material, the flow resistance loss at the time of the pressurized fluid pumping, and the physical loss including at least the movement (movement) loss and pressure loss of the bent pipe joint 10 are reduced.

The straight pipe material may be a known seamless pipe rolling process for perforating rolls or a seamless pipe method for welding.
A tube, an elliptical tube, a square tube, a deformed tube material or the like by a tube welding process) may be cut into a predetermined length, and the length and number of the straight tube portion 13 and the bent tube portion 14 may be used. It can also be formed and implemented without any restrictions on the angle, curvature and the like.

The point is not only to reduce the size and weight of the bent pipe joint 10, but also to consider the overall life cycle of the bent pipe joint 10 and comprehensively consider each material consumption, each resource energy consumption, harmful substance contamination, and each loss. It is important to reduce and implement it.

The invention according to claim 2 is the small precision bend pipe joint 10 according to claim 1, wherein the bend pipe joint 10 is at least the surface of the bend pipe joint 10 as shown in FIGS. 1 (A) to 1 (D). A passive film 10a in which the metal element or alloy element according to claim 1 is ion-bonded is formed on a part of the metal film. For example, when the base material of the bent pipe joint 10 is an Al / Al alloy material, an alumite film is formed. In the case of the same Mg / Mg alloy material, oxidized Mg film, etc. In the case of the same Ti / Ti alloy material, Ti oxide film, Ti carbide film, Ti nitride film, TiAlN film, etc., Fe / Fe alloy In the case of a material, a carburized film, a nitride film, a stainless steel film or the like is suitable, and these passive films 10a are formed by a known coating method.

Further, for example, a smooth metal rust preventive film 10a such as a Zn film, a solder film, a Sn film, a Cr film, a Ni film, or a Cd film may be formed by a known electrolytic / electroless / hot-plating method or the like.
Further, on the metal rust preventive film 10a, a known non-chromium chemical conversion treated rust preventive film, for example, a silicon alkoxide oligomer as a main component, and a sol-gel reaction is used to prevent both the barrier property and self-repair property on galvanizing. A rust film 10a (see Japanese Patent Application Laid-Open No. 2006-225761) or the like may be formed by coating.
Further, harmful components of the metal rust preventive film, such as Pb and inorganic Pb compounds, Cd and Cd compounds, hexavalent Cr compounds, metallic Ni and Ni compounds, metallic Co and Co compounds, etc. shown in FIG. It is desirable that the harmless rust preventive coating 10a be formed.

The point is that there is no limitation on the kind of each rust preventive coating material and the coating forming method thereof, and by applying a known harmless rust preventive coating effectively, stress corrosion cracking, corrosion disappearance, It is important to comprehensively control the pollution of harmful substances.

The invention according to claim 3 is a small precision bend pipe joint 10 in which the straight pipe portion 13 and the bend pipe portion 14 are formed of the straight pipe material according to claim 1, and the bend pipe joint 10 is shown in FIG. As shown in FIG. 1D, a straight pipe portion 13 extending in parallel with the pipe axis of the straight pipe material and a curved pipe portion 14 in which the pipe axis is bent into a predetermined smooth curve 14a are formed. In addition, in the vicinity of the straight pipe portion 13, the surface roughness Ra of the casting surface or hot forging surface shown in FIG. On the other hand, a welding joint surface 13a having a small friction coefficient of about 0.5, a seal body housing pressing groove 13b, a close fitting sheet surface 13c, a screwing screwing portion 13d, or a sealing precision outer diameter portion 13e. One or more connecting elements are formed, or the bent pipe joint 10 is mounted in the vicinity of the bent pipe section 14 and has a two-surface width section for engaging a tool. 4b, 14c is formed, flow resistance loss and the pressure loss of the bent tube joint 10, and carried by suppressing accompanied leakage loss and friction loss on the connection-engagement.

The invention according to claim 4 is the small precision bend pipe joint 10 according to any one of claims 1 to 3, wherein the bend pipe joint 10 is a straight joint of the bend pipe joint 10 as shown in FIG. A seal body 30 having an elastic limit larger than that of the straight pipe portion 13, such as an O-ring or the like, or around the precision outer diameter portion 13e according to claim 3, is tightly connected to the precision outer diameter portion 13e. A flat tight fitting washer 40 washer or the like for fitting and pressing the sealing body 30 or a screw for screwing the tight fitting washer 40 into the screwing portion 13d and pressing the tight fitting washer 40. A total sum of physical losses including leakage loss, pressure loss, heat transfer loss, etc. of fluid that is fitted with any one or more connecting elements of the joint nut 50 and is pumped through the pipe line of the small precision bend pipe joint 10 It is important to carry out with a reduction.

The invention according to claim 5 is an assembly 200 including the pressure piping circuit 100 using the small precision bend pipe joint 10 according to any one of claims 1 to 4, and the assembly 200 is, for example, shown in FIG. As shown in FIG. 4, the small precision bend pipe joint 10 is connected to a part of the pressure pipe 100 by using any one of the elements according to claim 3, or Pb-free solder material, Cd-free and Pb-free. Other pipe connection members that do not contain harmful components such as brazing materials, halide-free / fluoride-free flux agents, hexavalent Cr-free / Cd-free surface-treated washers and nuts, or other harmful components It is desirable to carry out by connecting using a pipe connecting member from which the inevitable component ratio is removed.

The invention described in claim 6 is the manufacturing method 60 for manufacturing the small precision bend pipe joint 10 according to any one of claims 1 to 4, wherein the manufacturing method 60 is as shown in FIG. A first step 60a in which the straight pipe material described is used as a workpiece, and the workpiece is cut to form a precision end face 10b having no burrs, sagging, fractured surfaces, or the like, or having little residual strain stress without post-finishing, At least two points including the precision end face 10b are constrained and the middle between the two points is pressed to form a predetermined smooth curve 14a in the hollow pipe 12 of the straight pipe workpiece 10c. As shown in (B), a second step 60b in which both the tube flesh 14in and 14out are reinforced and bent, and a straight pipe work piece so as to suppress a decrease in the pipe cross-sectional area 12a of the hollow pipe 12. 3rd process 60c which presses the outer wall surface of 10c, and carries out shaping | molding process, straight pipe | tube workpiece 10 A mold including a fourth step 60d for forming the two-surface width portions 14b and 14c according to claim 3 by plastic working on a part of the outer wall surface of the first and fourth steps, and a mold including any one or more of the first to fourth steps. A fifth step 60e for high-efficiency press working, and any one or more of the processing speeds described in the first to fifth steps is equal to or higher than the elastoplastic wave propagation velocity or the elastoplastic propagation velocity; The small precision bend pipe joint 10 can be manufactured and carried out by a known high-speed plastic working method that has been speeded up so as to approach.

The high-speed plastic working method has been put to practical use in the fields of high-speed milling by high-speed cutting, burr-free cutting by high-speed shearing, ultra-deep drawing by high-speed drawing, etc. It is rarely heard in the metal press working with the rotary mechanical press. This is due to the fact that the false notion that the plastic working speed by the rotary mechanical press cannot be changed is fixed, and the present inventor, before the advent of the direct acting electromagnetic press, By speeding up the plastic working speed of the press mold mounted on the rotary mechanical press, the press work quality defects such as burrs, sagging and fractured surfaces are substantially improved even under non-lubricated press working conditions. Therefore, it has been found that it is possible to suppress and eliminate the post-treatment process for reforming and the use of alternative chlorofluorocarbon cleaning solvents that have been conventionally used in metal press working. It is important that the invention described in claim 6 is implemented by applying the above knowledge and suppressing and eliminating the use discharge.

The invention described in claim 7 is a mold 70 used for carrying out the manufacturing method 60 described in claim 6, and the mold 70 is a straight pipe workpiece as shown in FIGS. 5 (A) and 5 (B). The straight pipe portion according to claim 1, wherein a fixed die assembly 71 comprising a die / tool, a die / tool holder, a die plate and the like 71 a for restraining and fixing the material 10 c, and the straight pipe work piece 10 c in cooperation with the fixed die assembly 71. 13 and the movable pipe assembly 14 including the punch / tool holder, the punch plate / tool holder, the punch plate, the movable strip 72, and the like, and the fixed mold assembly 71 and the movable mold assembly 72 with high accuracy. It implements by constituting a pair of small precision press dies 70 having main parts such as a rigid holding part 73 such as a die set to be held and a guide post.

The press mold 70 includes at least a part of the constituent materials of the

main parts

71, 72, 73 as shown in FIGS. 7 and 7A to 7D, as shown in FIGS. Be, Mg, Cr with a density smaller than that of tungsten (W), a high-rigidity heavy metal often used as a tool material, and a large specific rigidity (= an index of weight reduction of rigid bodies divided by the elastic constant divided by density) , Mo, Ti, Fe, Al, Ni, etc., or high rigidity materials mainly composed of metal elements such as Be, Mg, Al, Ti, Cr, Fe, Ni, Cu, Zn, Mo, Pd, etc. with high specific heat Or a harmless high-rigidity material in which harmful components such as Be and Be compounds, hexavalent Cr compounds, metallic Ni and Ni compounds, metallic Co and Co compounds, Cd and Cd compounds, and the like are inevitably removed to a ratio below the inevitable component ratio. It is desirable to use and implement. Preferably, an intermetallic compound in which the metal element is ionically bonded, an oxide, a nitride, a carbide, a silicide, or the like, or a highly rigid material mainly composed of an amorphous material obtained by rapidly solidifying the metal element is used. However, the present invention is not necessarily limited to the metal element. In short, the thermal stress deformation and strain loss, motion loss, heat transfer loss, and harmful substance contamination of the press die 70 are comprehensively reduced. It is important to implement each loss reduction by reflecting the speed of plastic working of the press die 70.

Further, as shown in FIG. 5B, the press die 70 includes at least a tool surface 74 that is in pressure contact with a workpiece and a member surface 74 that is pressure-slided with other mold structural members. . Compared with the non-pressurized contact surface of the press die 70, at least a part of the pressure contact surface 74 has a small surface roughness Ra = 0.1 μm or less, or a small friction coefficient, as exemplified in FIG. Finishing is performed so that the surface characteristics are μ = 0.5 or less, and the friction loss and wear loss of the press die 70 are reduced. Specifically, it is preferable to perform a so-called “mirror surface” finishing process using a known superfinishing process or a lapping process using a diamond paste.

Further, at least a part of the pressure contact surface 74 has a large hardness, for example, carburizing / nitriding quenching film, hard Cr plating film, anodized film, as illustrated in FIG. Or a chemical film, a ceramic film such as TiN / TiAlN / TiC / SiC / Al ₂ O _{3 with} a small surface roughness, or a characteristic film such as a DLC film with a small friction coefficient, or A non-hazardous characteristic film excluding harmful components such as hexavalent chromium compounds, Cd and Cd compounds, metallic Co and Co compounds, Pb and inorganic Pb compounds, metallic Ni and Ni compounds, or the like, The characteristic coating is formed on the characteristic surface, and the friction coefficient of the press contact surface 74 is minimized to reduce the friction loss, wear loss, and harmful substance contamination of the press die 70, and at the same time, reduce each loss reduction component. The plasticity of the press die 70 The speed performed by reflecting to speed.

In the case of the mechanical crank rotary type that is the most widely used processing machine for pressing, the plastic working speed 75 of the punch / tool 72a included in the movable mold assembly 72 is increased in the movable mold assembly 72 of the press mold 70. It is also effective to implement means, for example, means for machining the tool at a timing close to a crank rotation angle of 90 ° (the middle between the upper and lower dead centers is the maximum machining speed).

The invention according to claim 8 is the press working machine 80 used in the manufacturing method 60 according to claim 6, wherein the press working machine 80 is a fixed die assembly of the press die 70 according to claim 7 as shown in FIG. 6. A fixed part 81 such as a bolster to which 71 is attached, a movable mold assembly 72 of the press die 70 is attached, a movable part 82 such as a slide reciprocating between the upper and lower dead centers together with the movable mold assembly 72, and the entire press machine 80 Small precision automatic press working including main parts such as a rigid frame for driving and pressing the movable portion 82 while maintaining rigidity, a slide guide and the like 83a, a crank rotating shaft and the like 83b, and a connecting rigid rod portion 83c and the like. The machine 80 is configured and implemented.

The automatic press machine 80 includes at least a part of the constituent material of the

main parts

81, 82, 83 as illustrated in FIG. 7 and FIGS. 7 (A) to 7 (D) and FIG. 8. A high-rigidity material according to claim 7, or at least a part of the surface 84 to which the automatic press machine 80 is in pressure contact is finished on any of the characteristic surfaces according to claim 7, or at least The characteristic film according to claim 7 is coated on a part of the surface 84 to which the automatic press machine 80 pressurizes, or the characteristic film is coated on the characteristic surface. Comprehensive reduction of thermal stress deformation, strain loss, motion loss, heat transfer loss, friction loss, wear loss, and harmful substance contamination of the press machine 80, and at the same time, each loss reduction amount is converted to the plasticity of the press die 70. Reflected in increasing the processing speed To.

Further, the plastic working speed is increased by using a servo press machine in which the pressurizing speed 85 of the press machine 80 is variable or a direct-acting electromagnetic press machine in which the pressurizing speed 85 is highest at the bottom dead center. It can also be implemented.

The invention described in claim 9 is the small precision curved pipe joint 10 according to any one of claims 1 to 4, wherein the small precision curved pipe joint 10 is a manufacturing method 60 of the small precision curved pipe joint 10 according to claim 6. The small precision curved pipe joint 10 is manufactured by applying any one or more of the small precision press die 70 according to claim 7 or the small precision automatic press machine 80 according to claim 8. The total sum of specific environmental loads caused by the curved pipe joint 10 and the manufacturing process 60 is reduced.

According to a tenth aspect of the present invention, there is provided an assembly 200 including the pressure piping circuit 100 according to the fifth aspect, wherein the assembly 200 is formed in a part of the pressure piping circuit 100 included in the assembly 200. The small precision curved pipe joint 10 is connected by any one of the connection methods of the assembly according to claim 5, and the total of specific environmental loads by the small precision curved pipe joint 10 and the pressure piping circuit 100 is reduced. To implement.

Claims

It is a metal bent pipe joint used for a pressure piping circuit for pumping a pressurized fluid, and the material of the bent pipe joint has a density lower than that of a sulfide ore metal and is higher than that of the sulfide ore metal. It is a hard base metal material mainly composed of a metal element having either a large Clark number or a large recycling rate, or the hard base metal material has a specific strength greater than that of the base metal, and A reinforced alloy material with enhanced material properties by adding an alloying element with either a large specific heat or a large magnetic susceptibility compared to the base metal,
Or, as the metal bent pipe joint, any of the safety type alloy materials from which harmful components of the reinforced alloy material are removed to an inevitable component ratio or less,
Whether the metal bent pipe joint is formed of any one of the hard base metal material, the strengthened alloy material, and the safety type alloy material and has a shape including a hollow pipe passage of the bent pipe joint. Or a straight pipe material in which any one of the above materials is plastically processed in a long shape, and a straight pipe portion and a curved pipe portion in which a fluid to be pressurized smoothly flows through the hollow pipe passage. Precision curved pipe joint.
2. The small precision curved pipe joint according to claim 1, wherein the small precision curved pipe joint is a passive film in which the metal element or alloy element according to claim 1 is ionically bonded to at least a part of the surface of the small precision curved pipe joint. Or other smooth metal rust preventive film, non-chromium chemical formed rust preventive film on the metal rust preventive film, or a harmless rust preventive film excluding harmful components of the metal rust preventive film. The small precision bend pipe joint according to claim 1 characterized by things.
2. A small precision curved pipe joint in which a straight pipe part and a curved pipe part are formed of the straight pipe material according to claim 1, wherein the small precision curved pipe joint is a straight pipe extending in parallel with a pipe axis of the straight pipe material. Sheet and a curved pipe portion whose tube axis is bent in a smooth curved shape, and a close fitting sheet having a smaller surface roughness or a smaller friction coefficient than the outer surface of the straight tube in the vicinity of the straight tube portion Forming one or more elements of a surface, a welding joint surface, a screwing portion for screwing, a concave groove portion for sealing body containing pressing, or a precision outer diameter portion for sealing, or in the vicinity of the curved pipe portion, 3. A small precision curved pipe joint according to claim 1 or 2, wherein a two-face width portion for engaging a small precision curved pipe joint mounting tool is formed.
The small precision curved pipe joint according to any one of claims 1 to 3, wherein the small precision curved pipe joint has a larger elastic limit around the straight pipe portion of the small precision curved pipe joint than the straight pipe portion. Or a flat tight fitting washer that tightly fits the precision outer diameter portion and presses the seal body around the precision outer diameter portion according to claim 3 or the screw fitting portion according to claim 3 The small precision bend pipe joint according to any one of claims 1 to 3, wherein at least one element of a screw nut that is screwed into a joint portion and presses the tight fitting washer is mounted.
An assembly comprising a pressure piping circuit using the small precision bend pipe joint according to any one of claims 1 to 4, wherein the assembly is attached to a part of the pressure piping circuit. Any one of the small precision curved pipe joints, either the element according to claim 3 or 4 or another pipe connecting member not containing harmful components, or a pipe connection in which the harmful components are removed to an inevitable component ratio or less. An assembly comprising a pressure pipe circuit, wherein the pressure pipe circuit is connected by using a member, and a total sum of specific environmental loads by the small precision bend pipe joint and the pressure pipe circuit is reduced.
A manufacturing method for manufacturing a small precision curved pipe joint according to any one of claims 1 to 4, wherein the manufacturing method uses the straight pipe material according to claim 1 as a workpiece, and cuts the workpiece. A first step of forming a precision end face without post-finishing, pressing at the middle between the two points while constraining at least two points including the precision end face; A second step of bending the material of the tube while strengthening the material at the same time as forming a curved line; a third step of pressing and molding the outer wall surface of the straight pipe so as to suppress a reduction in the cross-sectional area of the hollow pipe A mold comprising: a step, a fourth step of forming the two-surface width portion according to claim 3 on a part of the outer wall surface of the straight pipe material by plastic working, and any one or more of the first to fourth steps. A fifth step of press working, and at least one of the processing speeds of each step described in the first to fifth steps is set to Or sex wave propagation velocity than, or elastic small precision bends manufacturing method of joints characterized by manufacturing by plastic wave high-speed plastic working that speed to approach the propagation speed.
The mold used for carrying out the manufacturing method according to claim 6, wherein the mold is a fixed mold that restrains and fixes a workpiece, a movable mold that cooperates with the fixed mold and transfers a predetermined shape to the workpiece. A pair of press dies having a main part such as a rigid holding part that holds the fixed mold and the movable mold with high precision are formed, and at least a part of the constituent material of the main part is smaller than a high-rigidity heavy metal. It is a high-rigidity material whose main component is a metal element having a density and high specific rigidity or high specific heat, or a harmless high-rigidity material in which harmful components of the material are removed to an inevitable component ratio or less. Or at least a part of the surface to which the mold is in pressure contact is finished to have a characteristic surface with either a small surface roughness or a small coefficient of friction compared to the non-pressurized contact surface of the mold , At least part of the surface with which the mold is in pressure contact Compared to the non-pressurized contact surface of the mold, it is a characteristic film having either a high hardness, a small surface roughness, or a small coefficient of friction, or a harmless characteristic in which harmful components of the film are removed below the inevitable component ratio Either coat or coat the characteristic surface on the characteristic surface, or take measures to increase the processing speed of the blade tool included in the mold in the movable mold, and increase the plastic processing speed of the mold A small precision press die used for carrying out the manufacturing method according to claim 6.
7. A processing machine used for carrying out the manufacturing method according to claim 6, wherein the processing machine attaches a fixed part of the small precision press mold according to claim 7, and attaches the movable mold of the mold together with the movable mold. Constructed in an automatic press machine having a main part such as a movable part that reciprocates between upper and lower dead points, and a pressure rigid frame part that drives and pressurizes the movable part to hold rigidity, and at least a part of the constituent material of the main part Is formed of any of the high-rigidity materials according to claim 7, or at least a part of the surface to which the processing machine is brought into pressure contact is finished on any of the characteristic surfaces according to claim 7, or at least The characteristic film according to claim 7 is coated on a part of the surface to which the processing machine is in pressure contact, or the hard film is coated on the characteristic surface, or the processing machine Means for increasing the pressurization speed of the processing machine; Flip, small precision automatic press machine to be used in the practice of the manufacturing method according to claim 6, characterized in that the speed of the plastic working rate of the mold.
The small precision curved pipe joint according to any one of claims 1 to 4, wherein the small precision curved pipe joint is a manufacturing method of a small precision curved pipe joint according to claim 6, or a small precision press die according to claim 7. A small precision curved pipe joint is manufactured by applying any one or more of the small precision automatic press machines according to claim 8, and the total of specific environmental loads caused by the small precision curved pipe joint and the manufacturing process is reduced. A small precision bend pipe joint characterized by
6. An assembly comprising the pressure piping circuit according to claim 5, wherein the assembly is a small precision bend pipe joint according to claim 9 in a part of the pressure piping. An assembly comprising a pressure piping circuit, wherein the total of specific environmental loads by the small precision curved pipe joint and the pressure piping circuit is reduced.