JP2017100164A - Manufacturing method of very small thin wall substantially cylindrical body - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a manufacturing method of an inexpensive very small thin wall cylindrical body having high fixation force, and being smooth in an inner surface.SOLUTION: A manufacturing method includes a first press process of molding in a crank shape in which an angle formed by a short size side both end parts and long size side both end parts of a metal thin pate is not a right angle, and a mutual shape of the short size side both end parts repeats refraction of an even number time of 2 or more in total, and in a group corresponding to refraction of an odd number and a group corresponding to refraction of an even number, the refraction of belonging to the same group refracts in the same direction, a second press process of molding in a substantially (m) shape in a cross-sectional shape of a state of continuing two half-cylinders and a third press process of forming into a substantially cylindrical shape in which the two end portions on the short side of the thin metal plate are opposed to each other and are not connected and fixed and the crank shape of the free ends is correspondingly fittable.SELECTED DRAWING: Figure 5

Description

  The present invention relates to a metal material that can be suitably used for electrodes, ornaments, medical catheters, injection needles, and the like, in which a thin plate material using this metal material is bent into a cylindrical shape and the opposite end edges thereof are fitted to each other. The present invention relates to a method for manufacturing a thin substantially cylindrical body.

  A thin thin cylindrical body using a noble metal material is used as a medical catheter as a part of a medical instrument for inspecting or treating an in-vivo tubular tissue such as an ornament, an electrode in the field of MEMS and contact probes, and a blood vessel. It is used in a wide range of industrial fields such as injection needles (for example, Patent Document 1).

  For example, in a medical catheter, in a vascular stenosis part such as angina pectoris or myocardial infarction, a penetrating catheter that penetrates the stenosis part, a balloon catheter equipped with a balloon used to expand the stenosis part, and when treating a stenosis part A guide catheter for guiding a guide wire or a balloon into a blood vessel, a suction catheter for removing a thrombus or the like in a stenosis, and the like are known.

  Since these medical catheters are excellent in chemical stability and radiopacity, a cylindrical radiopaque marker using a noble metal material is fixed.

  The procedures using these medical catheters are usually performed while X-ray irradiation is performed, and the positions and angles of the catheter and the guide wire are grasped by an X-ray impermeable marker and guided to the stenosis.

  Some cylindrical radiopaque markers used in medical catheters have the inner surface of the marker adjacent to the catheter lumen or guidewire cavity. Usually, this inner surface is a smooth surface by coating with a polymer or the like, and has a structure in which the resistance when the operator performs a delicate operation of the guide wire is suppressed as much as possible (for example, Patent Document 2).

  Examples of a method for producing this minute and thin cylindrical X-ray opaque marker include tube drawing methods such as plug drawing, empty drawing and core drawing (for example, Patent Documents 3 to 4).

  Plug drawing is excellent in terms of smoothing the surface roughness of the inner and outer surfaces, but if it is thin, it will not be able to withstand the drawing force and will tend to break or deform, making it difficult as a method of extending a thin cylindrical body. It is.

  On the other hand, emptying or centering may cause unevenness due to numerous wrinkles and coverings on the inner surface of the cylindrical body. In addition, the maximum length of the cylindrical body depends on the size of the tube drawing device, and since it is a long tube drawing process that requires a large number of die passes, it goes without saying that the number of tube drawing man-hours increases due to the narrowing of the tube, and the covering is peeled off. In addition to the need for inspection man-hours to eliminate the risk of falling off and contamination of the concavo-convex portion, it is more difficult to find and remove from the appearance because of the inner surface.

  Furthermore, mass-produced cylindrical radiopaque markers are fixed to a medical catheter by caulking. However, caulking the cylindrical body inevitably causes wrinkles on the outer surface or inner surface of the cylindrical body. In addition, a gap is formed between adjacent objects to be coated, and uniform fixing becomes difficult. Furthermore, when there are many wrinkles and irregularities due to covering on the inner surface of the cylindrical material itself, the instability of the fixing force becomes more remarkable.

  Therefore, it is unavoidable that a thing with insufficient adhesion is generated with a certain probability, but the examination of the adhesion force is practically impossible because it causes damage to the medical catheter. Furthermore, it cannot be said that there is no risk of dropping off in the blood vessel during the procedure due to the lack of fixing force, which is problematic in terms of safety.

  Thus, a cylindrical X-ray opaque marker used for a medical catheter is required to have a smooth inner surface and a high fixing force.

  In addition, an inexpensive cylindrical body is required in the market.

JP 2011-117882 A Japanese Patent Publication No. 7-2184 JP 2000-158038 A JP 2013-13599 PR

  An object of the present invention is to provide a method for producing a thin thin cylindrical body having a high fixing force, a smooth inner surface and being inexpensive.

  Therefore, the present invention is a free end 1 in which the both ends of the short side of the metal thin plate and the edges on both ends of the long side are not right-angled, and the both ends of the short side of the metal thin plate are oppositely connected and fixed. It was made into the micro thin-walled substantially cylindrical body which has the substantially crank shape in which edges can fit correspondingly. In addition, in order to caulk a thin thin substantially cylindrical body to the object to be coated, the thin thin substantially cylindrical body having a shape in which the free ends are separated from each other before caulking may be used.

  Here, the approximate crank shape at the free end of the present invention means that one free end repeats even number of refractions 3 and 4 that are 2 or more in total, and a group corresponding to an odd number of refractions and an even number of refractions. In a corresponding group, refraction belonging to the same group is defined as being refracted in the same direction.

  That is, the two free ends refract an even number of times, but the even-numbered refraction group and the odd-numbered refraction group are refracted in the same direction in each group, and the opposing free edges are parallel to each other. It becomes a refracted shape. However, the number of refractions does not include both starting points 2a and 2b that are refracted from the substantially circumferential portion at both ends in the length direction of the thin thin substantially cylindrical body to the free end 1. Further, the number of refractions is not particularly limited as long as it is an even number of 2 or more. Further, the number of refractions is counted from either one of the substantially circumferential end portions on the substantially circumferential end 6 side at both ends in the length direction of the minute thin-walled substantially cylindrical body.

  After caulking a thin thin substantially cylindrical body onto the object to be coated, the greater the number of refractions, the higher the effect of preventing the displacement of the free ends from each other, thereby increasing the fitting force to the object to be coated.

  The angle of each refraction point is preferably a right angle or an obtuse angle. This is because bending and chipping are likely to occur at each of the refraction points 3 and 4 when the angle method is less than 90 °, and when the refraction angle is 180 °, it becomes a straight line and does not have a crank shape. . If within the above range, after caulking a thin thin substantially cylindrical body to the object to be coated, the closer the refraction angle is to an acute angle, the higher the fitting force to the object to be covered, thereby preventing the free ends from being displaced from each other. Increases effectiveness.

  The angles of the refraction points 3 and 4 may not be the same, and may be different between the group corresponding to the odd number and the group corresponding to the even number.

  Further, at each of the refraction points 3 and 4, R processing or C chamfering may be performed to prevent bending or chipping, and the free ends are similar to each other in order to seal the joint more precisely. You may give the taper process to combine.

  The small thin-walled substantially cylindrical body of the present invention has a crank shape in which the free ends correspond to each other, but regarding the angle formed by the free ends with the substantially circumferential end 6 of the minute thin-walled substantially cylindrical body, It is preferable that it is 45 degrees or more smaller than 90 degrees by the frequency method. The reason why this angle is made smaller than 90 ° is to prevent the entanglement between minute thin-walled substantially cylindrical bodies and to increase the fitting force by increasing the distance and area where the free ends are fitted together.

  Here, the entanglement between minute thin-walled substantially cylindrical bodies means that a large number of minute thin-walled substantially cylindrical bodies are manufactured in mass production, and therefore, there are cases where the minute thin-walled substantially cylindrical bodies are placed in an environment where they are in contact with each other. .

  At this time, if the free ends of the minute thin-walled substantially cylindrical body are separated from each other, a state in which the separated portions are entangled with the crank-shaped refracting portion frequently occurs. In this state, when the angle is 90 °, the separation portion having the separation width 5 enters the crank-shaped refracting portions 3 and 4 and becomes entangled. However, the free end is inclined with respect to the cylindrical end portion. Intrusion is suppressed at the portion, and as a result, tangling is prevented.

  Even if this angle is less than 45 °, the effect of preventing entanglement can be obtained, but the angle at the part of the starting point 2b refracted from the substantially circumferential end to the free end at both ends in the length direction of the minute thin-walled substantially cylindrical body. Is less than 45 °, and bending and chipping are likely to occur at the starting point 2b.

  The separation width 5 between the free ends 1 can be adjusted as appropriate depending on the size of the object to be coated, and is most preferably a width that allows the free ends to be closely coupled together after the caulking process.

  However, the thin thin substantially cylindrical body may be coated on a linear covering object larger than the inner diameter of the thin thin substantially cylindrical body. In this case, it is preferable to adjust the separation width 5 before coating so that the percentage of the wire diameter of the coating object divided by the separation width after coating (hereinafter referred to as the separation ratio) is less than 25%. In the range of less than 25%, as the numerical value increases due to the elastic force of the metal thin plate material, the joining force to the coating target increases. However, if it exceeds 25%, it may fall off from the coating target due to strong bending or elongation. This is because if the negative value is negative, the free ends may collide with each other to cause chipping or bending.

  With regard to the minute thin-walled substantially cylindrical body of the present invention, the fine means an outer diameter of 6 mm or less, the thin means a thickness of 100 μm or less, and the length is not particularly limited.

  As the material of the metal thin plate, any known metal material may be used as long as it is appropriately selected depending on the intended use. However, X-ray impermeability, chemical stability, thinning, and forming into a substantially cylindrical body are possible. In view of excellent properties, it is preferable that one pure metal selected from the group of Au, Pt and Pd, more preferably at least one selected from the group of Ir, Ni, Re, Rh, Ru and W be 0 A noble metal alloy containing 1 to 30% by mass, the balance being selected from the group consisting of Au, Pt and Pd and inevitable impurities is preferable.

  Although the metal thin plate can be produced by forging or the like, electrolytic foil or rolling is particularly preferable in order to obtain a smooth surface state. Since the surface roughness of the material to be processed is greatly affected by the surface roughness of the electrode roll or rolling roll used, the electrolytic foil or rolling process becomes a smooth material as the smooth roll is used. Moreover, since it is a board | plate material, according to the surface roughness calculated | required, it can be made further smooth by performing grinding | polishing processes, such as buffing | polishing, and the danger of a foreign material mixing can be reduced.

  By pressing the thin metal plate obtained by the above means and forming it into a thin thin substantially cylindrical body, the outer inner surface of the substantially cylindrical body becomes smooth.

  When selecting the processing rate for thin metal plates, consider the outer diameter, thickness, length, surface, roughness, burrs and sagging dimensions and tolerances of the thin thin cylindrical body produced by pressing. However, in the present invention, the processing rate of the thin metal plate material is 10% to 99% in terms of the cross-sectional reduction rate. The reason for this is that if it is less than 10%, the flatness of the plate material is poor, and the substantially cylindrical shape collapses during molding during pressing. This is because if it exceeds 99%, the substantially cylindrical shape collapses due to the processing strain remaining on the thin metal plate.

  As described above, the metal thin plate material used has a processing rate in the range of 10% to 99% in terms of the cross-sectional reduction rate. When this is pressed, the circumference of the substantially cylindrical material obtained by pressing is approximately The occurrence of burrs and sagging at both ends is reduced. Further, by performing press processing after an appropriate heat treatment on the metal thin plate material, it is possible to reduce the occurrence of burrs and sagging during the press processing.

  According to the thin thin substantially cylindrical body of the present invention, the crank shape in which the free ends are correspondingly fitted together does not cause wrinkles on the outer surface or inner surface of the cylinder during caulking, and the entire circumference of the coating target is uniform. It is possible to wrap it in the film, and the effect of improving the strength of fixing force can be obtained. Further, since a thin plate having a smooth surface state can be directly molded into a substantially cylindrical body, the inner and outer surfaces thereof are smooth, and a more stable fixing force can be obtained.

  In addition, since a large number of thin plates that are substantially unlimited can be formed directly into a substantially cylindrical body continuously and in large numbers, an inexpensive cylindrical body can be provided.

  In addition, it is difficult to produce a sheet material that can be produced by pressing the metal sheet directly into the target dimensions by pressing, thereby reducing the cost by reducing the number of production steps and producing a sheet material. It is also possible to produce a thin cylindrical material.

Top view showing the manufacturing process of the first stage of press working using a thin metal plate Side view showing the production process of the second stage of press working using a thin metal plate Top view of a small thin cylindrical body with a crank shape that allows free ends to be fitted together. Front view of a small thin cylindrical body with a crank shape that allows free ends to be fitted together. A perspective view of a small thin cylindrical body having a crank shape that allows free ends to be fitted to each other.

  Examples of the present invention will be described below. In addition, embodiment of this invention is not limited to the following Example, It can adjust suitably with the dimension and characteristic of the target material.

  After obtaining an ingot by blending and melting so as to have a desired composition, forging, chamfering, annealing and rolling were performed to produce a metal plate material having a plate thickness of 1.2 mm. Thereafter, annealing and precision rolling were repeated to produce a metal thin plate with a plate thickness of 25 μm having a final processing rate of 90% in terms of cross-sectional reduction rate.

  Next, as a first stage of the press working using the metal thin plate, the metal thin plate was molded so that both ends on the long side had a corresponding crank shape (FIG. 1). At this time, the crank shape is inclined as necessary.

  As a second stage of the press working, bending is formed into a substantially m-shaped body in which two semi-cylindrical bodies are arranged side by side (FIG. 2). As the third stage of the press working, the both ends of the semi-cylindrical body are aligned so as to face each other, so that the outer diameter φ0.65 mm × the inner diameter φ0.60 mm, the wall thickness 25 μm, the length 1 mm, and the metal thin plate Both ends of the long side are free ends that are not connected and fixed opposite to each other, and a thin thin substantially cylindrical body having a crank shape that can be fitted with the free ends is obtained (FIGS. 3 and 3). 4, FIG. 5).

  This small thin-walled substantially cylindrical body has a crank-shaped refraction number of 2 at the free end, a separation width of 0.12 mm between the free ends, an angle of each refraction point between the free ends of 120 °, and the free ends are substantially thin. The angle formed with the substantially circumferential end of the cylindrical body was 80 °. Table 1 shows the material of each thin thin substantially cylindrical body and the surface roughness Ra on the inner surface of the small thin substantially cylindrical body.

従来例
従来例として、実施例と同様に板厚１．２ｍｍの金属板厚を作製した。その後、金属板材を筒状に巻いて継ぎ目を溶接し、ダイスと芯金を用いて所定の形状に伸管加工後、短尺に切断し、外径φ０．６５ｍｍ×内径φ０．６０ｍｍ、肉厚２５μｍ、長さ１ｍｍの微小薄肉略円筒体を得た。各々の微小薄肉略円筒体の材質、微小薄肉略円筒体の内面における表面粗さＲａを表１に併記する。

Conventional Example As a conventional example, a metal plate thickness of 1.2 mm was prepared in the same manner as in the example. After that, the metal plate material is wound into a cylindrical shape, the seam is welded, the tube is drawn into a predetermined shape using a die and a core metal, and then cut into a short length, outer diameter φ0.65 mm × inner diameter φ0.60 mm, wall thickness 25 μm. A thin thin substantially cylindrical body having a length of 1 mm was obtained. Table 1 shows the material of each thin thin substantially cylindrical body and the surface roughness Ra on the inner surface of the thin thin substantially cylindrical body.

  The table in Example 1 except that the angle between the free ends and the substantially circumferential end of the small thin-walled substantially cylindrical body, the number of refractions, and the angle of each refraction point (same or different for odd and even groups) were changed. 100 fine thin substantially cylindrical bodies were produced in the same manner as in No. 1 fine thin substantially cylindrical body type No. 1 (material: Pt). These 100 thin thin substantially cylindrical bodies were sealed in a 65 × 90 plastic bag, and the number of occurrences of entanglement between the thin thin substantially cylindrical bodies after being vibrated for 10 minutes by an ultrasonic cleaner was investigated. The survey results are shown in Table 2.

さらに、前記の微小薄肉略円筒体を外径φ０．５７の樹脂チューブにかしめ加工後(離隔率は１．４％)、樹脂チューブに対する固着強度(空隙発生固体数)について調査した結果を表２に記載する。また、従来例における表２の微小薄肉略円筒体種類Ｎｏ.３１（材質：Ｐｔ）においも、同様の調査を行った。

Furthermore, after caulking the above-mentioned thin thin substantially cylindrical body to a resin tube having an outer diameter of φ0.57 (separation ratio is 1.4%), the results of investigation on the adhesion strength (number of voids generated) to the resin tube are shown in Table 2. It describes. In addition, the same investigation was conducted for the small thin substantially cylindrical body type No. 31 (material: Pt) in Table 2 in the conventional example.

  The investigation of the bond strength (number of voids generated solids) was conducted by pulling 100 points of each resin tube with a small thin-walled approximately cylindrical body using a tensile tester with a constant change amount and bending at three points, and then forming a thin-walled approximately cylindrical body. The number of solids in which voids were generated between the body and the resin tube was confirmed visually and with an ultrasonic flaw detector. Further, at the time of investigating the adhesion strength, the solids in which bending or chipping occurred were classified and investigated as the number of breakage individuals. The types of survey conditions are listed in Table 2 as survey types.

  The same investigation was conducted on other materials (small thin-walled approximately cylindrical body No. 2 to 25), and the number of occurrences of entanglement due to the angle between the free ends and the substantially circumferential end of the minute thin-walled approximately cylindrical body. There was no difference in the tendency of increase / decrease, the tendency of increase / decrease of the adhesion strength (number of solids generated by voids), and the tendency of increase / decrease in the number of fractures.

  Except for caulking to resin tubes having various outer diameters, the number of voids generated was investigated in the same manner as in investigation type No. 8 in Table 2 in Example 2. In addition, the separation rate and the number of individuals dropped from the resin tube were also investigated during this survey. These survey results are listed in Table 3.

1 Free end 2a Start point 2b Start point (An angle between the free ends and the substantially circumferential end of the thin thin cylindrical body)
3 Refraction (odd number)
4 Refraction (even number)
5 Separation width 6 Approximate circumferential edge

Claims (5)

The angle formed between the short side ends of the metal thin plate and the long side ends is not a right angle, and the shape of the short side ends is a total of two or more times of refraction, and the group corresponding to the odd number of refractions. In the group corresponding to the even-numbered refraction, the first press step of forming a refraction belonging to the same group into a crank shape refracted in the same direction;
A second pressing step in which the cross-sectional shape of the two half-cylinders connected to each other is formed into a substantially m shape
A small amount including a third pressing step in which the short side ends of the metal thin plate face each other to form two free ends that are not connected and fixed, and the crank shapes of the free ends are correspondingly fitted into a substantially cylindrical shape. A method for producing a thin cylindrical body.   2. The method of manufacturing a thin cylindrical substantially cylindrical body according to claim 1, wherein each angle of refraction is a right angle or an obtuse angle.   3. The method for manufacturing a small thin substantially cylindrical body according to claim 1, wherein an angle formed by the free ends and the substantially circumferential end portion is 90 degrees or less by a power method.   4. The method for producing a small thin substantially cylindrical body according to claim 1, wherein the material of the metal thin plate is one selected from the group consisting of Au, Pt and Pd.   4. The metal thin plate according to claim 1, wherein the material of the thin metal plate contains 0.01 to 30% by mass of at least one selected from the group consisting of Ir, Ni, Re, Rh and W, with the balance being Au, Pt. And a method for producing a small thin-walled substantially cylindrical body, which is one type selected from Pd and inevitable impurities.

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