JP5016992B2 - Rhenium tungsten ribbon caulking parts - Google Patents

Description

  The present invention is used, for example, as a charge conductor for corona discharge, a septum conductor of an electrostatic septum, and parts similar thereto, and is connected to at least one end of a rhenium tungsten ribbon by caulking, not by welding. Relates to a caulking part of a rhenium tungsten ribbon to which is attached.

  Conventionally, a rhenium tungsten wire obtained by adding rhenium to tungsten has been used as a corona discharge charge wire. Further, a rhenium tungsten wire is used as a septum wire of an electrostatic septum used for extracting a slow beam in an accelerator.

  For example, for a corona discharge charge wire, the wire diameter is reduced to about 60 to 120 μm so that corona discharge is easily caused. In this case, plating or clad surface treatment with gold, platinum or the like is performed to prevent disconnection or the like due to abnormal discharge, thereby extending the life.

  However, for such a rhenium tungsten wire, the strength is significantly reduced due to microminiaturization, and the strength and durability may not be sufficient. It is possible to improve the strength to some extent by improving manufacturing conditions, such as manufacturing rhenium tungsten wire at a lower temperature, or performing work hardening without annealing during manufacturing, but during drawing, There are cracks, disconnections, etc., and satisfactory products are not necessarily obtained.

In order to suppress the strength reduction due to such miniaturization, for example, rhenium is contained in an amount of 15 to 40% by weight, the balance is tungsten, and the ratio (X / Y) of the major axis X to the minor axis Y in the cross-sectional shape is A rhenium tungsten wire having a tensile strength of 1.5 to 3.5 and a tensile strength of 3000 N / mm ² or more is known. According to such a rhenium tungsten wire, since the cross-sectional shape is a flat shape, the reduction of the cross-sectional area of the wire is suppressed, and furthermore, sufficient mechanical strength is maintained because the tensile strength is a specific value or more, It has become possible to meet the demand for miniaturization of wires (for example, see Patent Document 1).
JP 2002-75059 A

  In recent years, for corona discharge charge wires, the use of rhenium tungsten wires with smaller wire diameters has been studied due to the miniaturization of products, and the use of rhenium tungsten ribbons instead of rhenium tungsten wires has also been studied. . Also, in the septum wire used for the electrostatic septum, rhenium with a smaller wire diameter is used from the viewpoint of reducing the beam loss by reducing the number of hits between the beam and the septum wire when extracting a slow beam from the beam that goes around the accelerator. The use of a tungsten wire is being studied, and the use of a rhenium tungsten ribbon instead of a rhenium tungsten wire is being considered.

  By the way, in such a corona discharge charge wire or the like, terminals are attached to both ends thereof by welding, for example. However, when the terminal is attached by welding, the rhenium tungsten wire or the like is melted and recrystallized, so that the characteristics may vary. For this reason, for example, a terminal having an annular portion is used, and after inserting an end portion such as a rhenium tungsten wire into the annular portion, the terminal is attached by crushing the annular portion, so-called caulking fixing is considered. Has been.

  However, in such terminal mounting by caulking, when a rhenium tungsten wire having a thinner wire diameter or a thin rhenium tungsten ribbon as described above is used, these rhenium tungsten wire or rhenium tungsten ribbon and terminal are used. There is a problem in that the rhenium tungsten wire or the rhenium tungsten ribbon is easily dropped from the terminal.

  That is, as for the rhenium tungsten wire, when the wire diameter is reduced, the cross-sectional area is reduced in inverse proportion to the square thereof, and the adhesion with the terminal is greatly reduced. In addition, the caulking is fixed by fixing the rhenium tungsten wire or the rhenium tungsten ribbon so as to be sandwiched by the terminals from the wire diameter direction or the thickness direction, so that the elasticity is easily applied when the wire diameter or thickness is large. However, if the wire diameter or thickness becomes smaller, the elasticity becomes smaller, so it becomes difficult to fix.

  The problem of falling off in the caulking fixing can be solved by increasing the caulking strength when attaching the terminal to the rhenium tungsten wire or the rhenium tungsten ribbon. In this case, the rhenium tungsten wire or the rhenium tungsten ribbon is used. There is a problem that it is easy to break at the caulked portion.

  The present invention has been made in order to solve the above-described problems. In a rhenium tungsten ribbon caulking component in which a terminal is attached to a rhenium tungsten ribbon by caulking and fixing, the adhesion between the rhenium tungsten ribbon and the terminal is improved. An object of the present invention is to provide a crimped part of a rhenium tungsten ribbon which is excellent and suppresses dropping of the rhenium tungsten ribbon from the terminal and also suppresses disconnection of the rhenium tungsten ribbon in the crimped portion.

The rhenium tungsten ribbon caulking component of the present invention is a rhenium tungsten ribbon caulking component in which a terminal is attached by caulking to at least one end of the rhenium tungsten ribbon, and the optical surface of the rhenium tungsten ribbon. The arithmetic average surface roughness Ra by the roughness measurement is 0.10 μm or more and 0.80 μm or less. The rhenium tungsten ribbon has a thickness ratio (Te / Tc) between an edge thickness Te that is a thickness at an end portion in the width direction and a center thickness Tc that is a thickness at a center portion in the width direction. ) Is 0.2 or more and 0.9 or less.

The rhenium tungsten ribbon preferably has an aspect ratio (W / Tc) of 1.5 or more in the width W and the center thickness Tc which is the thickness at the center in the width direction. The width W is preferably 300 μm to 3 mm and the center thickness Tc is preferably 10 μm to 200 μm. Furthermore, the rhenium tungsten ribbon preferably has a tensile strength of 1200 N / mm ² or more and an elongation of 1% or more.

Et al of the rhenium tungsten ribbon preferably contains less 44 wt% 1 wt% or more of rhenium.

  According to the present invention, in a rhenium tungsten ribbon caulking component in which a terminal is attached by caulking, not by welding, to at least one end of the rhenium tungsten ribbon, the arithmetic average surface roughness is measured by measuring the optical surface roughness of the rhenium tungsten ribbon. By setting the thickness Ra to be 0.10 μm or more and 0.80 μm or less, the adhesion between the rhenium tungsten ribbon and the terminal can be improved, and the rhenium tungsten ribbon can be prevented from dropping off from the terminal. Moreover, since the falling of the rhenium tungsten ribbon from the terminal is suppressed, there is no need to increase the caulking strength when attaching the terminal to the rhenium tungsten ribbon, thereby suppressing the disconnection of the rhenium tungsten ribbon in the caulking portion. it can.

Hereinafter, the present invention will be described in detail.
FIG. 1 is a side view showing an example of a caulking part 1 (hereinafter simply referred to as caulking part) of the present invention, and FIG. 2 is a top view of the caulking part 1 shown in FIG. is there.

  As shown in FIG. 1, a caulking part 1 includes, for example, a rhenium tungsten ribbon 2 and terminals (caulking metal fittings) made of a pair of metal materials attached to both ends of the rhenium tungsten ribbon 2 by caulking and fixing. 3. The terminal 3 has, for example, an annular portion 3a on the side to which the rhenium tungsten ribbon 2 is attached. After the rhenium tungsten ribbon 2 is inserted into the annular portion 3a, the annular portion 3a is crushed so that the rhenium tungsten ribbon 2 is It is attached by being sandwiched between the annular portions 3a (caulking and fixing). In addition, the terminal 3 is provided with a hole 3b used for mounting to a device, for example. 1 and 2 show a state after the terminal 3 is caulked and fixed, and the annular portion 3a is shown in a crushed state. Further, Tc in FIG. 1 indicates the thickness of the rhenium tungsten ribbon 2, and particularly indicates the thickness (center portion thickness) in the center portion in the width direction of the rhenium tungsten ribbon 2, and W in FIG. The width is shown.

  3 and 4 show another example of the caulking part 1 of the present invention. FIG. 3 is a side view showing the caulking part 1, and FIG. 4 is a top view of the caulking part 1 shown in FIG.

  The caulking component 1 is obtained by caulking and fixing a plurality of rhenium tungsten ribbons 2 with terminals 3 at both ends thereof. The plurality of rhenium tungsten ribbons 2 are arranged in parallel so as to be equally spaced by spacers 4 arranged at both ends in the longitudinal direction thereof. The terminal 3 is fixed so as to cover the periphery of the laminated structure of the rhenium tungsten ribbon 2 and the spacer 4 at both ends. The terminal 3 is a plate-like member made of, for example, a metal material, and is fixed by being wound so as to be tightened while being deformed around the laminated structure portion of the rhenium tungsten ribbon 2 and the spacer 4 (caulking and fixing). . As in FIGS. 1 and 2, Tc in FIG. 3 indicates the thickness of the rhenium tungsten ribbon 2, and particularly indicates the thickness (center portion thickness) in the center of the rhenium tungsten ribbon 2 in the width direction. W indicates the width of the rhenium tungsten ribbon 2.

  In the present invention, in the caulking part 1 in which the terminal 3 is attached by caulking and fixing at least one end of the rhenium tungsten ribbon 2 as described above, the arithmetic average by optical surface roughness measurement is obtained as the rhenium tungsten ribbon 2. A material having a surface roughness Ra of 0.10 μm or more and 0.80 μm or less is used.

  Here, the arithmetic average surface roughness Ra by the optical surface roughness measurement in the present invention is obtained by scanning, for example, a 100 μm × 100 μm region of the rhenium tungsten ribbon 2 as a measurement surface using a laser microscope. . The surface roughness measurement includes an optical type and a stylus type. Since the optical type can be measured with higher accuracy than the stylus type, the present invention employs optical measurement. In the JIS standard, the line roughness based on the contour curve is defined as the surface roughness. However, in the present invention, the surface roughness in the region of 100 μm × 100 μm is also different as described above. In the case of the line roughness, the numerical value may vary greatly depending on the place to be measured, but in the surface roughness, the entire region can be evaluated and accurately quantified.

  The arithmetic average surface roughness Ra according to the present invention is specifically measured using an ultra-deep shape measurement microscope VK-8500 manufactured by Keyence Corporation and the attached image measurement / analysis software VK-H1W. ”And“ Surface roughness ”, and the measurement is performed by designating an area of 100 μm × 100 μm. The arithmetic average surface roughness Ra by optical surface roughness measurement of the rhenium tungsten ribbon 2 is preferably 0.10 μm or more and 0.80 μm or less for the entire surface. Usually, both main surfaces of the rhenium tungsten ribbon 2 are used. When the region having the above-mentioned size in an arbitrary portion selected from the above is measured, it may be 0.10 μm or more and 0.80 μm or less.

  When the arithmetic average surface roughness Ra of the rhenium tungsten ribbon 2 is less than 0.10 μm, the adhesion between the rhenium tungsten ribbon 2 and the terminal 3 is not sufficient, and when the load is applied to the rhenium tungsten ribbon 2, the terminal There is a risk that the rhenium tungsten ribbon 2 will easily fall off from 3. In such a case, it is conceivable that the rhenium tungsten ribbon 2 is prevented from falling off from the terminal 3 by increasing the caulking strength, but this is not preferable because the rhenium tungsten ribbon 2 is easily disconnected at the caulking portion. On the other hand, when the arithmetic average surface roughness Ra exceeds 0.80, the smoothness of the surface is reduced, and there is a possibility that characteristic unevenness occurs when used as a charge conductor for corona discharge.

  In the present invention, the arithmetic average surface roughness Ra of the rhenium tungsten ribbon 2 is set to 0.10 μm or more and 0.80 μm or less, thereby improving the adhesion between the rhenium tungsten ribbon 2 and the terminal 3, and rhenium tungsten from the terminal 3. It is possible to suppress the occurrence of characteristic unevenness while suppressing the dropping of the ribbon 2. Further, since the falling of the rhenium tungsten ribbon 2 from the terminal 3 is suppressed, there is no need to increase the caulking strength when the terminal 3 is attached to the rhenium tungsten ribbon 2, and thus the caulking portion of the rhenium tungsten ribbon 2 is obtained. Disconnection can also be suppressed. The arithmetic average surface roughness Ra of the rhenium tungsten ribbon 2 is preferably small from the viewpoint of suppressing the occurrence of characteristic unevenness, for example, 0.40 μm or less, and more preferably 0.20 μm or less.

  Table 1 shows the results of manufacturing the crimped component 1 by actually changing the arithmetic average surface roughness Ra of the rhenium tungsten ribbon 2 and examining the terminal loss and the characteristic unevenness. In addition, manufacture of the crimping | compression-bonding component 1, evaluation of terminal omission and characteristic nonuniformity was performed as follows.

  First, the rhenium tungsten ribbon 2 contains 26% by weight of rhenium, the remainder is made of tungsten, and has a thickness Tc of 30 μm and a width W of 1 mm. The arithmetic average roughness Ra of the surface was adjusted by performing electrolytic etching while changing the etching amount. A terminal 3 having an annular portion 3a as shown in FIG. 5 was used. The terminal 3 is made of SUS304, and the annular portion 3a has an outer diameter of 3.0 mm, an inner diameter of 1.5 mm, and a length of 10 mm. The arithmetic average surface roughness Ra of the inner diameter side surface is of this type. It was set to 1.6 μm in general.

  After that, as shown in FIG. 5, 5 mm of the rhenium tungsten ribbon 2 is inserted into the annular portion 3a of the terminal 3 and pushed from above and below so that the thickness of the annular portion 3a (outer diameter in the crushing direction) is 1.4 mm. The caulking part 1 was obtained by crushing and fixing the rhenium tungsten ribbon 2 by caulking.

  The measurement of terminal loss was carried out by mounting such a caulking part 1 on a tensile tester and applying a load of 4 kg by moving the crosshead to check whether or not the rhenium tungsten ribbon 2 slipped out from the terminal 3. For characteristic unevenness, the energy efficiency is actually measured using the caulking part 1 and the energy efficiency of 90% or more of the theoretical value is regarded as having no characteristic unevenness, and is less than 90% of the theoretical value. The product was assumed to have characteristic unevenness. In addition, regarding the caulking part 1 having an arithmetic average surface roughness Ra of 0.05 μm of the rhenium tungsten ribbon 2, the terminal unevenness occurred before the predetermined load was applied, and thus the characteristic unevenness was not evaluated.

  As is apparent from Table 1, when the arithmetic average surface roughness Ra of the rhenium tungsten ribbon 2 is 0.05 μm, the rhenium tungsten ribbon 2 may slip out of the terminal 3 when a load of 2.5 kg is applied. Recognize. In contrast, when the arithmetic average surface roughness Ra of the rhenium tungsten ribbon 2 is 0.10 μm or more, it can be seen that the terminal 3 does not slip out of the rhenium tungsten ribbon 2 even when a load of 4 kg is applied.

  The arithmetic average surface roughness Ra is not particularly limited as long as it is 0.10 μm or more from the viewpoint of suppressing slippage of the rhenium tungsten ribbon 2 from the terminal 3, but if it is 1.00 μm or more, characteristic unevenness may occur. Recognize. For this reason, it is preferable that the arithmetic average surface roughness Ra is 0.10 μm or more and 0.80 μm or less from the viewpoint of suppressing the occurrence of characteristic unevenness while suppressing slipping of the rhenium tungsten ribbon 2 from the terminal 3. I understand.

  For such a rhenium tungsten ribbon 2, if the cross-sectional area is the same, the contact length (outer peripheral length) with the terminal 3 is longer when the aspect ratio (W / Tc) of the width W and the thickness Tc is larger. Therefore, it is preferable because the rhenium tungsten ribbon 2 can be prevented from dropping from the terminal 3.

  The aspect ratio of the rhenium tungsten ribbon 2 is preferably 1.5 or more from this point of view, but is preferably 15 or more from the viewpoint of further increasing the contact length and suppressing the dropping of the terminal 3, and more preferably 30 or more.

  On the other hand, if the aspect ratio of the rhenium tungsten ribbon 2 becomes excessively large, it generally leads to an increase in the size of the caulking component 1 and, as a result, an increase in the size of a device on which the caulking component 1 is mounted. Things are used.

  Table 2 shows, as an example, a rhenium tungsten wire having a radius of 0.1 mm as a reference, and a contact length (periphery length) when the aspect ratio of the rhenium tungsten ribbon 2 is changed so that the cross-sectional area of the rhenium tungsten wire is the same. ). The contact length is the length of the outer periphery of the rhenium tungsten wire or the rhenium tungsten ribbon 2 and contributes to the improvement of the adhesion with the terminal 3. Moreover, the relative ratio in the column of the contact length indicates the contact length of the rhenium tungsten ribbon 2 relative to the contact length of the rhenium tungsten wire as 1.00.

  As is clear from Table 2, if the cross-sectional areas are the same, the contact length of the rhenium tungsten ribbon 2 having a rectangular cross-sectional shape is longer than that of a rhenium tungsten wire having a circular cross-sectional shape. I understand. In addition, by setting the aspect ratio (W / Tc) of the rhenium tungsten ribbon 2 to 1.5 or more, the contact length can be increased by 15% or more, thereby preventing the terminal 3 from falling off the rhenium tungsten ribbon 2. It turns out that it becomes easy.

  The thickness Tc of the rhenium tungsten ribbon 2 is preferably 200 μm or less, more preferably 100 μm or less, from the viewpoint of miniaturization of the product and reduction of beam loss in an electrostatic septum used for performing slow beam extraction in an accelerator. It is. Since the rhenium tungsten ribbon 2 having a thickness Tc of less than 10 μm is actually difficult to manufacture, the rhenium tungsten ribbon 2 in the present invention usually has a thickness Tc of 10 μm or more.

  In addition, the width W is preferably 15 μm or more, more preferably 150 μm or more, from the viewpoint of securing the contact length with the terminal 3 and suppressing dropping off from the terminal 3 and from the viewpoint of handleability. Preferably it is 300 micrometers or more. The width W is about 10 mm depending on the application, but is generally 3 mm or less.

  In the present invention, for example, even when a thin rhenium tungsten ribbon 2 having a thickness Tc of 200 μm or less is used, the arithmetic average surface roughness Ra is set within a specific range, and preferably the aspect ratio (W / Tc) is set. By setting it within a specific range, the adhesion between the rhenium tungsten ribbon 2 and the terminal 3 can be improved, and the rhenium tungsten ribbon 2 can be prevented from dropping off from the terminal 3. Further, in the present invention, since the adhesion between the rhenium tungsten ribbon 2 and the terminal 3 is excellent, there is no need to increase the caulking strength, and this is the case when the thin rhenium tungsten ribbon 2 having a thickness Tc of 200 μm is used. However, the disconnection in the caulking portion can be suppressed.

  6 to 8 schematically show the cross-sectional shape of the rhenium tungsten ribbon 2. The rhenium tungsten ribbon 2 has a constant thickness in the width direction as shown in FIG. 6, the center portion is the thickest as shown in FIG. 7, and gradually becomes thinner toward the end in the width direction. In addition, as shown in FIG. 8, the thickness of the end portion in the width direction is almost zero.

  Here, Tc is the thickness of the central portion in the central portion in the width direction as already described. Te is the thickness (edge portion thickness) at the end in the width direction. In addition, in the case where the end in the width direction is rounded as shown in FIG. 7, it is difficult to accurately measure the edge thickness Te. A straight line (two wavy lines extending in the horizontal direction in the figure) extending along the surface along the surface of the line 2 is drawn, and these intersect with a straight line drawn vertically so as to contact the end in the width direction. The distance between the two intersections is defined as the edge thickness Te.

  Any of those shown in FIGS. 6 to 8 can be used in the present invention, but preferably the ratio of the edge thickness Te to the center thickness Tc (Te / Tc) is 0.2 or more and 0.0. What is 9 or less, for example, as shown in FIG. 7 is preferable. In the case where the thickness ratio is almost 1 as shown in FIG. 6, that is, the thickness is almost constant, a substantially right-angled corner 2a is formed at the end in the width direction. Since abnormal discharge is likely to occur from 2a, it is not preferable. Further, as shown in FIG. 8, even when the thickness ratio is less than 0.2, that is, when there is an acute angle portion 2b at the end in the width direction, abnormal discharge easily occurs from the acute angle portion 2b. It is not preferable. For this reason, it is preferable that the substantially square corner portion 2a and the acute corner portion 2b are not easily formed and abnormal discharge hardly occurs and the thickness ratio is 0.2 or more and 0.9 or less.

  Table 3 shows the relationship between the ratio of the thickness of the rhenium tungsten ribbon 2 (Te / Tc) and the presence or absence of abnormal discharge. The ratio of the thickness of the rhenium tungsten ribbon 2 was adjusted by changing the edge thickness Te while keeping the center thickness Tc constant at 30 μm. The edge portion thickness Te was adjusted by performing electropolishing, and specifically by adjusting the feed rate and energization amount of the workpiece when performing electropolishing. The width W of the rhenium tungsten ribbon 2 was 1 mm.

  As shown in Table 3, when the thickness ratio exceeds 0.9, that is, when a substantially right-angled corner 2a is formed at the end in the width direction as shown in FIG. It was recognized that abnormal discharge is likely to occur with the corner 2a as a base point. If the edge portion thickness Te is reduced and the thickness ratio is reduced, the occurrence of abnormal discharge can be suppressed. However, when the thickness ratio is less than 0.2, for example, as shown in FIG. Since the sharp corner 2b is formed, it was recognized that abnormal discharge tends to occur with the sharp corner 2b as a base point. This shows that the ratio of the thickness of the rhenium tungsten ribbon 2 is preferably 0.2 or more and 0.9 or less.

The rhenium tungsten ribbon 2 used in the present invention preferably has a tensile strength of 1200 N / mm ² or more. Furthermore, the rhenium tungsten ribbon 2 preferably has an elongation of 1% or more. When the tensile strength of the rhenium tungsten ribbon 2 is less than 1200 N / mm ^2, it is easy to break due to insufficient mechanical strength when the terminal 3 for manufacturing the caulking part 1 is installed, and the caulking part 1 is used as a device. Also when mounting, it is not preferable because it is easy to break due to insufficient mechanical strength.

  On the other hand, even when the elongation rate of the rhenium tungsten ribbon 2 is less than 1%, it is easy to disconnect from the lack of elongation when the terminal 3 for manufacturing the caulking part 1 is attached. Also, it is not preferable because it is easy to break due to insufficient elongation when mounting. If the elongation ratio of the rhenium tungsten ribbon 2 becomes excessively large, unnecessary contact with other parts will be caused. For example, in an electrostatic septum, the number of hits with the beam will increase and the beam loss will increase. The elongation percentage of 2 is preferably 5% or less.

  The tensile strength is measured as follows. That is, the maximum load when the distance between ratings is 50 mm and a tensile load is applied at a pulling speed of 10 mm / min is divided by the cross-sectional area. The cross-sectional area is polished by embedding the rhenium tungsten ribbon 2 in a resin so that the cross-section is exposed, the cross-section is enlarged 1000 times with an electron microscope, and the area is obtained by image analysis. Further, the elongation percentage is obtained by subtracting the length before applying the load from the length when the maximum load is applied and dividing by the length before applying the load.

  The rhenium tungsten ribbon 2 used in the present invention may be one containing at least rhenium and the balance being tungsten, but preferably contains 1 wt% or more and 44 wt% or less of rhenium. Rhenium has an effect of strengthening the grain boundary of tungsten, but if its content is less than 1% by weight, it is difficult to obtain the above effect, which is not preferable. Also, if the rhenium content is low, the mechanical strength such as tensile strength is greatly lowered when exposed to high temperatures during production or subsequent use. On the other hand, as shown in the phase diagram of FIG. 9, when the rhenium content exceeds 44% by weight, a very hard and brittle difficult-to-work layer called a σ layer is deposited, and cracks are easily generated during wire drawing. Absent. The rhenium content in the rhenium tungsten ribbon 2 is preferably 1% by weight or more and 29% by weight or less from the viewpoint of workability and the like.

FIG. 10 shows a case where rhenium tungsten (H30) containing 3% by weight of rhenium and the balance being tungsten and general doped tungsten (W30) not containing rhenium are heat-treated at a predetermined temperature for 5 minutes. The tensile strengths of the two are compared. As shown in FIG. 10, it can be seen that those containing 3% by weight of rhenium maintain a tensile strength of 1200 N / mm ² or more even after heat treatment at a high temperature exceeding 2300 ° C. On the other hand, what does not contain rhenium is found to have a tensile strength of less than 1200 N / mm ² when it exceeds 2300 ° C. Since those containing rhenium can maintain the tensile strength even after being heat-treated at a high temperature, they are particularly suitable for those that become hot due to collision with a beam, such as a septum conductor of an electrostatic septum. Used.

  Note that the rhenium tungsten ribbon 2 may contain a third component or an unavoidable component depending on the specific application and without departing from the spirit of the present invention. As such a thing, what is conventionally contained in this kind of thing is mentioned, Specifically, even if it contains about 10 ppm or more and about 100 ppm of at least one selected from potassium, aluminum, and silicon Good.

  As the terminal 3 used in the present invention, for example, a rhenium tungsten ribbon 2 as shown in FIGS. 1 and 2 has an annular portion 3a on the side to which the rhenium tungsten ribbon 2 is attached, and the rhenium tungsten ribbon 2 is deformed by deforming the annular portion 3a. 3 and 4 are plate-like members that are fixed and deformed in an annular shape so as to be wound around the rhenium-tungsten ribbon 2. It is not limited, and any material can be used as long as it can be fixed to at least the end portion of the rhenium tungsten ribbon 2 by deforming itself.

  The terminal 3 is generally made of stainless steel such as SUS304, but is not necessarily limited to this, and may be made of other metal materials, for example, for corona discharge. What is normally used as a terminal of a septum conductor in a charge conductor or an electrostatic septum can be used without particular limitation.

  The caulking part 1 of the present invention can be suitably used as a charging conductor for corona discharge in a charging device for charging a photosensitive member in an image forming apparatus such as a copying machine or a facsimile machine, particularly a charging device adopting a corona discharge method. Further, the caulking part 1 of the present invention can be suitably used as a septum conductor of an electrostatic septum used for taking out a slow beam in an accelerator.

  For example, many copying machines, facsimile machines, and the like function as image forming apparatuses that form images on recording paper based on image data read from a document or image data received by facsimile. In this image forming apparatus, a latent image based on image data is formed on the surface of a uniformly charged photoconductor, and the latent image is developed with toner and transferred onto a recording sheet to form an image. Here, as a means for charging the photosensitive member, a so-called corona discharge method is often used. In this corona discharge method, a charging device in which a charge conductor is surrounded by a casing is disposed in the vicinity of the photoreceptor, and a high voltage is applied to the charge conductor. At this time, the air in the vicinity of the charge conductor is ionized to generate ions, and the ions move to the photoconductor to charge the surface of the photoconductor. The caulking component 1 of the present invention can be suitably used as a charge conductor in, for example, such a corona discharge charging device.

  For example, in an accelerator, an electrostatic septum is used to extract a slow beam. A septum conductor is disposed in the electrostatic septum, and a beam can be bent by generating a high electric field in the septum conductor. The septum conductor in such an electrostatic septum is desired to be thin in order to reduce beam loss, and is required to be excellent in reliability without disconnection or the like. The crimped component 1 of the present invention can be suitably used as such a septum conductor because the terminal 3 is securely fixed even when the rhenium tungsten ribbon 2 is thin.

  Next, the manufacturing method of the crimping component 1 of this invention is demonstrated. First, a method for manufacturing the rhenium tungsten ribbon 2 will be described.

  First, rhenium powder and tungsten powder are mixed so that rhenium is 1 wt% or more and 44 wt% or less (mixing step). The rhenium powder preferably has a particle size of 0.5 μm to 5 μm, more preferably 1 μm to 5 μm, and still more preferably 1 μm to 3 μm. Any suitable method for adding and mixing both powders can be employed. In the present invention, preferably, for example, rhenium powder is added to tungsten powder in an amount of 1 wt% or more and 44 wt% or less, and the mixture can be uniformly mixed using an appropriate mixing apparatus (for example, a ball mill).

The mixed powder may, for example molding pressure molded at 1 ton / cm ² or more 3 ton / cm ² or less, the vertical and horizontal is less the 15mm or 25 mm, is the following moldings 500mm or 700mm length (molding step). For easy handling, the molded body is temporarily sintered at, for example, 1300 ° C. or more and 1400 ° C. or less, and then subjected to main sintering at, for example, 2800 ° C. or more and 3100 ° C. or less to obtain a sintered body (sintering) Process).

  The obtained sintered body is processed until it reaches a predetermined thickness Tc by appropriately combining plastic processing such as forging and rolling and distortion removal processing such as annealing (plastic processing step). Thereafter, the work material having the predetermined thickness Tc is cut into a predetermined width W to obtain a rhenium tungsten ribbon 2. At this time, a predetermined aspect ratio (W / Tc) can be obtained by adjusting the width W to be cut.

  The arithmetic average surface roughness Ra of the rhenium tungsten ribbon 2 is adjusted by adjusting the surface roughness of the rolling roll used during rolling or the electrolytic processing rate during electrolytic processing, and by performing polishing and blasting after plastic processing. Can do. Further, the tensile strength and elongation of the rhenium tungsten ribbon 2 can be adjusted by adjusting the annealing temperature and time during plastic working.

  Furthermore, the cross-sectional shape of the rhenium tungsten ribbon 2, that is, the ratio of the thickness (Te / Tc) between the edge portion thickness Te and the center portion thickness Tc can be adjusted by performing electropolishing, specifically, electropolishing. It can be adjusted by adjusting the feed speed, energization amount, and electrolyte concentration of the workpiece at the time.

  Next, attachment of the terminal 3 to the rhenium tungsten ribbon 2 will be described. For example, as shown in FIG. 5, at least one end portion of the rhenium tungsten ribbon 2 having a predetermined arithmetic average surface roughness Ra is inserted into the annular portion 3 a of the terminal 3. Thereafter, the annular portion 3a of the terminal 3 is crushed by applying a certain load using an appropriate caulking device. Similarly, after inserting the other end of the rhenium tungsten ribbon 2 into the annular portion 3a of the terminal 3 separately prepared, the annular portion 3a is crushed by applying a certain load. By doing in this way, the crimping components 1 as shown in FIGS. 1 and 2 can be obtained.

  3 and 4, a plurality of similar rhenium tungsten ribbons 2 are prepared. First, a plurality of rhenium tungsten ribbons 2 are arranged in parallel, and adjacent rhenium tungsten ribbons 2 are arranged. A spacer 4 is disposed between the end portions. The spacer 4 can be made of stainless steel such as SUS304 as in the case of the terminal 3, but is not necessarily limited to this. Then, while temporarily fixing the laminated body with a jig or the like so as not to collapse, it is wound so as to be tightened while deforming a plate-like member made of stainless steel, such as SUS304, which becomes the terminal 3 around both ends thereof. Fix it. By doing in this way, the crimping components 1 as shown in FIGS. 3 and 4 can be obtained.

  Although the present invention has been described above, the caulking part 1 of the present invention is not necessarily limited to the one in which the terminals 3 are provided at both ends of the rhenium tungsten ribbon 2 as shown in FIGS. The terminal 3 may be provided only at one end. Further, the shape of the terminal 3 is not necessarily limited, and a terminal having an annular portion 3a as shown in FIGS. 1 and 2 or a plate-like one as shown in FIGS. In addition to those that are rotated, any material that can effectively fix the rhenium tungsten ribbon 2 by deforming itself may be used. Further, the number of rhenium tungsten ribbons 2 is not necessarily limited. For example, in the case shown in FIGS. 3 and 4, the number of rhenium tungsten ribbons 2 may be a plurality other than four.

The side view which shows an example of the crimping component of this invention. FIG. 2 is a top view of the caulking part shown in FIG. 1. The side view which shows the other crimping components of this invention. FIG. 4 is a top view of the caulking part shown in FIG. 3. The schematic diagram which shows an example of the attachment method (caulking fixation) of a terminal. The schematic diagram which shows an example of the cross-sectional shape of a rhenium tungsten ribbon. The schematic diagram which shows the other example of the cross-sectional shape of a rhenium tungsten ribbon. The schematic diagram which shows the other example of the cross-sectional shape of a rhenium tungsten ribbon. Phase diagram of rhenium tungsten alloy. The figure which shows the tensile strength after heat processing of a rhenium tungsten ribbon.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Caulking part, 2 ... Rhenium tungsten ribbon, 3 ... Terminal, 4 ... Spacer

Claims (5)

A rhenium tungsten ribbon caulking part in which a terminal is attached by caulking and fixing to at least one end of the rhenium tungsten ribbon,
The rhenium tungsten ribbon has a thickness ratio (Te / Tc) between an edge thickness Te that is a thickness at an end portion in the width direction and a center thickness Tc that is a thickness at a center portion in the width direction. The rhenium tungsten ribbon caulking is characterized in that it is 0.2 or more and 0.9 or less, and the arithmetic average surface roughness Ra by optical surface roughness measurement of the rhenium tungsten ribbon is 0.10 μm or more and 0.80 μm or less. parts.   The aspect ratio (W / Tc) of the center part thickness Tc which is the thickness in the width W and the center part of this width direction is 1.5 or more, The said rhenium tungsten ribbon is characterized by the above-mentioned. Rhenium tungsten ribbon caulking parts. The rhenium tungsten ribbon crimped part according to claim 1 or 2 , wherein the rhenium tungsten ribbon has a width W of 300 µm to 3 mm and a center thickness Tc of 10 µm to 200 µm. The rhenium tungsten ribbon caulking part according to any one of claims 1 to 3, wherein the rhenium tungsten ribbon has a tensile strength of 1200 N / mm ² or more and an elongation of 1% or more. The rhenium tungsten ribbon caulking part according to any one of claims 1 to 4 , wherein the rhenium tungsten ribbon contains 1 wt% or more and 44 wt% or less of rhenium.

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