KR100856107B1 - Manufacturing method of pipe type fine metal thread and manufacturing method of porous metal using the metal thread - Google Patents

Abstract

A method of manufacturing a pipe type fine metal thread and a method of manufacturing porous metal using the fine metal thread are provided to manufacture porous metal having superior mechanical and structural strength and to maximally ensure the amount of perfume and continuous time of scent when scent metal is manufactured by putting the perfume into the porous metal. A method of manufacturing a pipe type fine metal thread comprises a step of forming a hollow unit for fixing a rack(10) at the center of a metal preform(1). The metal preform is mounted on a chuck(13) of the rack and a bite(6) having a cut surface inclined downward at an angle of 0° to 15° is mounted on a tool die(11) of the rack so that the outer peripheral surface of the metal preform is in close contact with a cut blade of the bite. The bite is transferred toward the metal preform to cut the outer peripheral surface of the metal preform.

Description

Manufacturing method of pipe type fine metal thread and manufacturing method of porous metal using the metal thread

According to the present invention, by cutting a metal base material, which is a thin metal plate, by a bite, the cutting chips generated from the metal base material are made of pipe-shaped micrometallic yarns, and the lumps of fibers made of the micrometallic yarns are pressed and sintered. By manufacturing the porous metal, it is possible to greatly reduce and reduce the time and cost according to the production of the fine metal yarn and the porous metal, as well as to provide a porous metal having a very high porosity and excellent mechanical and structural strength, Therefore, the pipe-type micrometallic yarn manufacturing method and the production of porous metals using the micrometallic yarn to ensure the maximum amount of fragrance penetration and fragrance duration even when manufacturing fragrance metals by infiltrating the fragrance with the porous metal. It is about a method.

In general, porous metal is not only used as a fancy product or a noble metal product as a precious metal product, but also in a fuel cell field of a hydrogen automobile, such as a sparger, a gas filter, or an electrolytic cell for the addition of gaseous water. It can be used as a membrane support (Membrane), the porous metal has an excellent mechanical and structural strength, but also combines the ability to adsorb by a myriad of pores (pore), the field of application is gradually expanding.

As the most representative example of manufacturing the porous metal as described above, the powder mass in which the powder mass containing the fine metal powder or the fine metal yarn alone or mixed is introduced into the molding surface of the press mold or the hydraulic press. Is pressurized at a high pressure of about 100 MPa to 600 MPa, and then primary molded into the required shape, and then, the primary molded preform is charged into a sintering furnace and heated and sintered to a predetermined temperature, thereby increasing the overall porosity. The metal sintered body is about 10% to 20%.

However, metal powder or micrometallic yarn, which is a material for a conventional porous metal, is manufactured through a difficult and complicated process of fine-spraying the molten metal into a space set under cooling conditions while melting the metal. There was a problem that the time and cost of the metal powder or the fine metal yarn to be increased unnecessarily, due to this, the manufacturing cost of the porous metal produced by the metal powder or the fine metal yarn was also unnecessarily increased.

In addition, even in the process of primarily manufacturing the preform by pressing the metal powder or fine metal yarn in a press apparatus, the metal powder or the fine metal yarn components cannot be closely connected structurally or mechanically, In order to secure the strength of the preform, a mixture of binders and point payments for bonding metal powders or fine metal yarns is used. As a result, additional cost increases as well as the porosity formed by the metal powder or fine metal yarns are increased by There was a problem of being lowered by the binder component.

Even if a binder or a caking agent is used to pressurize the metal powder or the fine metal yarn as described above to produce a preform, the metal powder or the fine metal yarn particles are not organically and firmly linked, so that a press apparatus is used. By pressing the powder mass to a very high pressure of about 100Mpa ~ 600Mpa to be able to produce a preform of the required strength, there was a problem that the production of the preform and the porous metal is very difficult.

In addition, even when the preform is sintered to produce a porous metal, when the melting temperature of the binder or the binder becomes higher than the melting temperature of the metal powder or the fine metal yarn, the preform is prepared until immediately before the melting temperature of the binder or the binder. In the heating process, there was a problem that the metal powder or the fine metal yarn was pre-melted and agglomerated into a certain sized agglomeration, and thus the structure of the pores formed in the porous metal was very simple.

As described above, when the porosity of the porous metal is lowered and the pore structure is also very simple, the amount of fragrance penetrating through the porous metal and the duration of fragrance due to the fragrance metal are greatly reduced. Even when used as a filter or membrane support, the adsorption force and the amount of adsorption of foreign matter through pores are also greatly reduced, which has a problem of adversely affecting the external competitiveness of products manufactured by porous metals.

The present invention has been made to solve the above conventional problems, the method of manufacturing a pipe-type micrometallic yarn according to the present invention and a porous metal manufacturing method using the micrometallic yarn, the metal base material to be a thin metal plate By cutting the cutting by bite, the cutting chip generated from the metal base material to make the pipe-shaped fine metal yarn, and the fiber mass made of the fine metal yarn to press-process and sinter the fiber to produce a porous metal, so that the fine metal yarn and porous In addition to greatly reducing and reducing the time and cost of metal manufacturing, and to provide a porous metal with a very high porosity and excellent mechanical and structural strength. Also maximizes the penetration of fragrance and duration of fragrance And to ensure that as to its technical challenges.

The present invention as a means for solving the above technical problem, the metal base material forming step of forming a hollow part for fixing the shelf in the center of the metal base material to be a metal plate of 0.5mm ~ 3mm thickness; The metal base is mounted on the chuck of the lathe, while the tool post of the lathe is equipped with a bite inclined downward at an angle of 0 ° (horizontal) to 15 °, so that the outer peripheral surface of the metal base is in close contact with the cutting edge of the bite. Machining lathe setting step; While cutting the metal base material mounted on the chuck on the lathe, while transferring the bite mounted on the tool post to the metal base side to cut the outer circumferential surface of the metal base material; by going through, the length 0.5mm ~ 3mm, diameter 0.05 It is characterized in that a pipe-like micrometallic yarn having a thickness of mm to 0.3 mm is obtained as a cutting chip.

In addition, the present invention by forming a cutting groove radially at regular intervals along the circumferential portion of the metal base material in the metal base material forming step, so that the peripheral portion of the metal base material is divided into a plurality of cutting pieces having a fan shape, In the machining lathe setting step, a spacer is interposed between the lower side of the bite engaged with the tool bar of the lathe, and the lower side of the bite is set so as to be spaced apart from the tool bar with a gap of 0.1 mm to 1 mm.

In addition, the present invention is a fine metal yarn input step of injecting a fiber mass of the fine metal yarn manufactured through the process step from the metal base material forming step to the metal base material cutting step into the molding surface of the press mold; A press molding step of pressing a fiber mass of the fine metal yarn using a press mold to produce a preform in which the fiber mass of the fine metal yarn is consolidated; The preform is inserted into a sintering furnace and heated and sintered until just before the melting point of the base metal, characterized in that it is made through a sintering step of producing a porous metal.

According to the present invention as described above, it is possible to easily obtain the micrometallic yarn, which is the material of the porous metal, as a cutting chip through the cutting process of the metal base material by the lathe, thereby reducing the time and cost according to the manufacture of the fine metal yarn to the maximum. And it has the effect of reducing, and therefore, there is a significant reduction in the manufacturing cost of the porous metal produced by using the fine metal yarn as an raw material.

In addition, in the process of primarily manufacturing the preform by pressing a mass of fibers made of micrometallic yarns in a press apparatus, the micrometallic yarns having a pipe shape may be closely connected structurally or mechanically while being interlocked with each other. By pressing the fiber mass by the micrometallic yarn at a relatively low pressure has the effect of producing a preform having a sufficient strength.

Therefore, as in the conventional case, the strength of the preform can be sufficiently secured even without performing a large-capacity press operation using a binder or a binder for adhesion of micrometallic yarns, and thus the preform and the porous metal sintered therefrom. Not only has the effect of significantly reducing the manufacturing cost of the micro metal yarn itself is formed in a pipe shape, as well as the binders and binders are not included in the fiber mass by the micro metal yarn, Porosity is also effective to ensure the level of 20 ~ 40%.

In addition, when the preform is sintered to prepare a porous metal, the micrometallic yarn itself is completely melted and pored as the sintering process is appropriately performed at the temperature level just before the melting temperature of the metal, considering only the melting temperature of the fine metal yarn. There is no problem of agglomeration into a certain size of agglomerates without this, and thus the structure of the pores formed in the porous metal is intricately intertwined with each other to form a very complicated passage.

As described above, the porosity of the porous metal is greatly improved, and the pore structure also has a complicated passage structure in which the pore structure is tightly intertwined, so that the amount of fragrance penetrating through the porous metal and the duration of the fragrance due to the fragrance metal are produced. Of course, there is an effect to ensure the maximum, and even when using a porous metal as a gas filter or membrane support, there is also an effect of greatly improving the adsorption capacity or adsorption amount of foreign matter through the pores, which is produced by the porous metal It has a very useful effect such as greatly contributing to securing the external competitiveness of the product.

Hereinafter, described in detail with reference to the accompanying drawings, the present invention for achieving the above object is as follows.

First, the process step of the present invention for producing a fine metal yarn to be a porous metal material, as shown in the process block diagram of Figure 1, the metal base material forming step of molding a metal base material required for the production of fine metal yarn ( S1), a machining lathe setting step (S2) for mounting the metal base material together with the bite (S2), and a metal base material cutting step of obtaining a pipe-type fine metal yarn as a cutting chip by cutting the metal base material using the lathe ( S3).

As shown in FIGS. 2 and 3, the metal base material forming step S1 forms a hollow part 2 for fixing the shelf in the center of the metal base material 1, which is a metal plate having a thickness of 0.5 mm to 3 mm. As a process step of making, the thickness of the metal base material (1) is the length of the cutting chip generated from the metal base material (1) during the cutting process by the bite, that is, the length of the pipe-type micrometallic yarn produced by the present invention.

Therefore, the thickness of the metal base material (1) is most preferably about 0.5mm ~ 3mm corresponding to the length of the pipe-type micrometallic yarn suitable for the production of porous metal, the metal base material (1) having a thickness of less than 0.5mm is the base material It is not preferable because the manufacturing itself is relatively difficult, and the metal base material 1 having a thickness of more than 3 mm is not only difficult to uniformly cut to obtain a pipe-like micrometallic yarn, but also a bite to which cemented carbide or diamond is applied. The cutting part of is large and it is uneconomical.

However, by cutting the metal base material 1 having a thickness of more than 3 mm as a bite to produce a pipe-type micrometallic yarn having a long length, and then use it by crushing it finely. In addition, since it can be used for mechanical parts such as gas filters or membrane supports, the thickness of the metal base material 1 can be applied up to 1 cm.

In addition, the diameter of the metal base material 1 is not limited to a large, but in the manufacture of pipe-type micrometallic yarns using a small mechanical lathe or CNC lathe, the diameter (diameter) of the metal base material 1 is 2,5cm The diameter of the hollow part 2 is also sufficient to be in the range of ˜10 cm, and the diameter of the hollow portion 2 may be such that the metal base material 1 can be easily fixed to the chuck for the lathe.

In addition, in the metal base material forming step (S1), the cutting grooves 3 are radially formed at regular intervals along the circumferential portion of the metal base material 1, as shown in FIGS. 2 and 3. It is more preferable that the periphery of the base material 1 is divided into a plurality of cutting pieces 4 having a fan shape, such as a built-up edge when cutting the metal base material 1 by a bite. By preventing the same factor, the pipe-shaped cutting chip can be produced uniformly.

In other words, when the disk-shaped metal base material 1 is cut from the lathe to the bite, a built-up edge (Built-up edge) is generated on the bite. In this case, the pipe-like micrometallic yarn may be helically connected to the pipe-type micrometallic yarn from the metal base material 1, and the material of the metal base material 1 may be soft (aluminum or silver) or cut. It is more likely to occur when the speed is slower.

Therefore, the cutting grooves 3 are radially formed at regular intervals along the circumferential portion of the metal base material 1 so that the periphery of the metal base material 1 is divided into a plurality of cutting pieces 4. By reducing the cutting load of the metal base material (1) by the cut off as well as factors such as constituent edge, as well as preventing the cutting chip is not broken in a single pipe unit by the incision groove (3). This may contribute more to the aspect that allows the pipe-like micrometallic yarn from the metal base material 1 to be made into a uniform cutting chip.

In addition, although the number of the cutting grooves 3 formed along the circumferential portion of the metal base material 1 is increased, it is preferable in terms of obtaining the pipe-type micrometallic yarn with a uniform cutting chip, but the number of the cutting grooves 3 is increased. Simply increase the waste of material and increase the manufacturing cost of the metal base material 1, so that the spacing of the cutting grooves 3, i.e., the maximum circumferential length L of the cutting piece 4 is in the range of 3 mm to 1 cm. Preferably, the width d1 of the cutout is preferably about 1 mm to 2 mm.

In addition, the length of the cutting groove (3) is to be a length of about 3/4 to 4/5 of the width, based on the width between the outer peripheral surface of the metal base material 1 and the inner peripheral surface of the hollow portion (2). It is advantageous in processing, and the inner end of the cutting groove (3) to eliminate the uneven surface generated during the processing of the cutting groove (3) so as not to interfere with the cutting operation of the metal base material (1) of circular buffer holes ( It is preferable to form 5), and the diameter of the buffer hole 5 may be equal to or slightly larger than the width d1 of the cutout groove 3.

After the metal base material forming step (S1) as described above, as shown in Figures 4 to 6, the lathe 10 capable of cutting the metal base material 1, such as a small machine lathe or CNC lathe 10 While the metal base material 1 is mounted on the chuck 13 of the jaw by the jaw 15, the tool post 11 of the lathe 10 has a cutting surface inclined downwardly at an angle of 0 ° (horizontal) to 15 °. 6) as a fixing bolt (11a), the outer peripheral surface of the metal base material (1) is subjected to the machining lathe setting step (S2) so as to be adjacent to the cutting edge of the bite (6).

As shown in (a) and (b) of FIG. 4, the bite 6 used for cutting the metal base material 1 in the working lathe setting step S2 is cemented carbide bite 6 or its cutting part. The tip of the bite 6 including the cutting face of the bite 6, that is, the main cutting edge 8 and the auxiliary cutting edge 9. The upper side is used to be inclined downward to 0˚ (horizontal) ~ 15˚ angle (θ1), the auxiliary cutting edge (9) is assisted when the cutting process by the main cutting edge (8) can not be performed To do so, it is located in a different direction from the main cutting edge (8).

In general, in the case of a bite used for cutting using a lathe, the cutting surface is formed to be inclined to the upper side, while the chip breaker is formed at the rear side of the cutting surface, so that the cutting chips cut out from the base material by the bite are spiraled. After the cutting chip has a length such that the cutting chip is cut to a certain length, the cutting chip is cut by the chip breaker. As the angle of the cutting edge with the base material increases, the cutting chip becomes a flow type chip (Flow type). chip).

Therefore, if the cutting edge of the bite to make an angle of 90 ° or less to the base material, the cutting chips are not helically connected in the pipe form is dried in the form of a pipe and then cut to a short size, using this principle As shown in FIGS. 5 and 6, in a state in which the cutting edge 8 of the bite 6 inclined downward at 0 ° (horizontal) to 15 ° angle θ1 is in close contact with the outer circumferential surface of the metal base material 1. As the metal base material 1 is rotated at a high speed to perform cutting by the bite 6, pipe metal micrometallic yarns are made from the metal base material 1 into cutting chips.

The cutting angle θ1 of the bite 6 is an optimal angle for obtaining the pipe-type micrometallic yarn as the cutting chip, and when the cutting angle is out of the angle range, the cutting chip is spirally discharged from the metal base material 1. Alternatively, the cutting chip does not achieve the pipe shape required, and the angles denoted by α and β in FIGS. 4A and 4B indicate the allowable angle of the bite 6, which is applied to the material of the metal base material 1. There may be some differences, depending on the angle range of approximately 4 ~ 30˚.

However, the clearance angle of the bite 6 denoted by α and β is not a component affecting the manufacturing method according to the present invention, and the cutting of the bite 6 by the cutting edges 8 and 9 is possible. The external shape of the bite 6 excluding the angle θ1 may be other types of bites 6 in addition to those shown in the drawings, and the cutting of the metal base material 1 by the bite 6 is possible. Of course, the shelf 10 may also be used in various kinds.

In addition, as shown more clearly in FIG. 6, in the above machining lathe setting step S2, a spacer 16 is disposed between the tool post 11 of the lathe 10 and the lower side of the bite 6. By interposing, it is more preferable to set the lower side of the bite 6 so as to be spaced apart from the tool post 11 with a clearance gap 17 of 0.1 mm to 1 mm, and this clearance 17 is formed of the metal base material 1. When cutting resistance acts momentarily on the cutting edge 8, 9 tip of the bite 6 at the time of cutting, it is responsible for buffering this to make the production of pipe-type micrometallic yarn more easily and accurately.

The spacer 16 mounts the metal base material 1 on which the cutting groove 3 is not formed on the shelf 10, and has an inclined angle θ1 of 0 ° (horizontal) to 5 ° inclined downward. In the case where the metal base material 1 is cut, the cutting resistance acting on the cutting edges 8 and 9 of the bite 6 is buffered so that no factors such as construction edges are generated. 16 uses a tool such as a thin blade so that the lower surface of the bite 6 engaged with the tool post 11 is opened with the tool post 11 by a predetermined angle θ2, but the tool post 11 and The maximum spacing of the bites 6 is adjusted within a range of 0.1 mm (θ 1 = 5 °) to 1 mm (θ 1 = 0 °).

After the above machining step setting step (S2), by rotating the drive shaft 14 of the lathe 10, the metal base material 1 mounted on the chuck 13 is rotated at a high speed, while the tool post ( 11 (a) to (c) and FIG. 7 according to the metal base material cutting step S3 for transferring the bite 6 mounted on the 11) to the metal base material 1 side using the carriage 12. As shown in the photograph of 8, the production of the pipe-type micrometallic yarn according to the present invention, which obtains a pipe-type micrometallic yarn 20 having a length of 0.5 mm to 3 mm and a diameter (d2) of 0.05 mm to 0.3 mm as a cutting chip. The method is complete.

In the cutting step (S3) of the metal base material, the rotational speed (rpm) of the metal base material 1 and the rapid feeding speed of the bite 6 by the carriage 12 are the type and thickness of the metal to be the base material and the pipe to be manufactured. It can be seen that it is difficult to define within a certain range due to various conditions such as the size of the type fine metal yarn 20, the rotation speed of the metal base material (1) is about 500rpm ~ 2000rpm is suitable, the grade of the bite (6) This speed is about 0.1cm / min ~ 3cm / min is appropriate.

The reason why the rotation speed of the metal base material 1 is about 500rpm to 2000rpm as described above is to ensure the minimum rotation speed for effective cutting of the metal base material 1 and at the same time, excessive power due to the operation of the shelf 10. Preferred range that prevents waste and prevents obstacles such as cutting edges, and prevents cutting chips as pipe-type micrometallic yarns 20 generated from the metal base material 1 from scattering in a wide range. Because it is.

In addition, when the rotational speed of the metal base material 1 is set to 2000 rpm or more, it is preferable to provide a means such as a shielding cover of the cutting chip in the periphery of the machining portion to prevent scattering of the cutting chip. The rapid speed (feeding speed) of is determined by the diameter d2 of the pipe-shaped micrometallic yarn 20 to be the cutting chip, that is, the thickness of the chip according to the cutting depth of the bite 6 and the radius of curvature of the chip. The feed rate of the bite 6 is also adjusted within the above-described range so that the diameter d2 of the pipe-shaped micrometallic yarn 20 is about 0.05 mm to 0.3 mm, which is preferable for the production of porous metal. It is preferable.

According to the pipe-type micrometallic yarn manufacturing method according to the present invention as described above, the micrometallic yarn 20, which is a material of the porous metal, can be easily used as a cutting chip through cutting of the metal base material 1 by the lathe 10. Since it can be obtained, it is possible to shorten and reduce the time and cost according to the manufacture of the fine metal yarn 20 to the maximum, and thus the production cost of the porous metal produced using the fine metal yarn 20 as an raw material is also remarkably. Can be saved.

In addition, in the process of primarily manufacturing the preform by pressing the fiber mass composed of the micrometallic yarns 20 in a press apparatus, the micrometallic yarns 20 having a pipe form are closely coupled to each other structurally or mechanically. Since it can be linked, it is possible to manufacture a preform having a sufficient strength even if the fiber mass by the fine metal yarn 20 is pressed at a relatively low pressure by using a press device.

Therefore, as in the conventional case, the strength of the preform can be sufficiently secured even without performing a large-capacity press operation using a binder or a binder for adhesion of the fine metal yarn 20, and thus the preform and the sintered it. Not only can greatly contribute to reducing the manufacturing cost of the treated porous metal, the micrometallic yarn 20 itself is formed in a pipe shape, as well as a binder or a binder in the fiber mass by the micrometallic yarn 20. Since it is not, the porosity of the porous metal is also to be secured at a level of about 20 to 40%.

Hereinafter, with reference to the accompanying drawings the porous metal manufacturing method of the present invention carried out after the pipe-type micrometallic yarn manufacturing method of the present invention as described above in detail as follows.

First, the process step of the present invention for producing a porous metal using the micrometallic yarn 20, as shown in the process block diagram of Figure 1, presses a fiber mass made of micrometallic yarn 20 After the fine metal yarn input step (S11) to be injected into the forming surface of the, press forming step (S12) for pressing the fiber mass of the fine metal yarn 20 using a press mold, and the press molding step (S12) The prepared preform is charged into a sintering furnace to be made of a sintering treatment step (S13).

The fine metal yarn input step (S11) is a fiber by the fine metal yarn 20 by gathering the fine metal yarn 20 manufactured through the process up to the metal base material cutting step (S3) by the amount necessary for the production of preforms After forming a lump, the fiber mass is introduced into the molding surface of the press mold. In FIG. 9, the upper and lower presses 21 and 22 are formed on the upper and lower presses as a representative example of the press mold. The hydraulic press molds with the lower molds 23 and 24 are shown, and the fiber mass of the fine metal yarn 20 is introduced into the forming surface 24a of the lower mold 24. .

After the fine metal yarn injection step 11 as described above, as shown in FIG. 10, the upper press 21 installed to move up and down along the guide rod 27 by a hydraulic device not shown in the lower press ( By lowering to the side 22, the forming surface 23a of the upper mold 23 is brought into close contact with the forming surface 24a of the lower mold 24, and in the process, the forming surface 24a of the lower mold 24 is formed. By allowing the fiber mass of the fine metal yarn 20 to be pressed, the fiber mass of the fine metal yarn 20 is subjected to a press molding step S12 of manufacturing a preform 26 in which the fiber mass of the fine metal yarn 20 is consolidated.

In the press forming step (S12) as described above, a sufficient bond without pressing a separate binder or binder to the fiber mass of the fine metal yarn 20 at a pressure of about 300kg / cm ² ~ 1500kg / cm ² It is possible to produce a preform 26 having a strength, which is applied to the pipe-type micrometallic yarn 20 produced by the present invention as a material of the preform 20 as described above. This is an advantage that can be obtained.

In addition, the press apparatus is provided with a molding surface to be press-molded into a preform 26 having a shape requiring a fiber mass of the fine metal yarn 20, and at the same time 300kg of the fiber mass of the fine metal yarn 20 If it is possible to achieve the function of pressurizing at a pressure of about / cm ² ~ 1500kg / cm ² , it is understood that any type of hydraulic or mechanical press device can be applied in addition to those shown in the drawings, The pressurization is preferably such that the pressure is gradually increased after the close contact of the molds 23 and 24 to separate the molds 23 and 24 as soon as the required pressure level is reached.

In addition, the heating coil 25 formed inside the molding surfaces 23a and 24a of the upper and lower molds 23 and 24 may more easily aggregate the fiber lumps of the fine metal yarn 20 during the pressing process. When the fiber mass is heated to a temperature of 200 ° C. or less, or when the melting temperature of the fine metal yarn 20, that is, the sintering temperature of the preform 26 is 200 ° C. or less, the preform 26 In this case, since the preform 26 may adhere to the molding surfaces 23a and 24a, the press molding step S12 is performed at room temperature and the preform 26 is carried out. ) Heating and sintering is preferably carried out in a separate sintering furnace.

After the press molding step (S12) as described above, the preform 26 is charged into a sintering furnace to heat and sinter the preform 26 until just before the melting point of the base metal, thereby producing a porous metal. By passing through (S13), the method for producing a porous metal according to the present invention is completed, and the representative types of metals applicable to the present invention and the melting temperatures and ranges of sintering temperatures based on the melting temperatures are given in Table It is as described in 1.

Table 1: Sintering temperature of preform according to metal type

Type of metal Melting temperature (℃) Sintering Temperature (℃) silver 960 930-950 Copper 1083 1053-1073 gold 1064 1034 to 1054 nickel 1445 1415-1435 Stainless steel Around 1800 (by type) Around 1770 ~ 1790 titanium 1668 1638-1658

In addition to the metals described above, various other metals or alloys may be the material of the porous metal according to the present invention. The sintering temperature of the preform 26 is based on the melting temperature of the metal or alloy. It is preferable to adjust suitably according to the diameter and size of the fine metal yarn 20 within the range of (melting temperature-30 degreeC)-(melting temperature -10 degreeC).

In addition, when the preform 26 is charged into the sintering furnace and heated and sintered, the sintering furnace is operated at a temperature gradient of about 300 ° C / hr to 500 ° C / hr. The sintering furnace used for the sintering treatment of the preform 26 is most suitable. However, any type of sintering furnace can be used as long as it can secure the temperature necessary for the sintering treatment. It is to be clear.

The porous metal finally produced through the sintering treatment step (S13) as described above is structural or mechanical between the pipe-type micrometallic yarns 20 without using a binder or a binder as shown in the cross-sectional photograph of FIG. By the linkage method, while having a high porosity of 20% to 40%, each micrometallic yarn 20 component is firmly adhered by sintering, so that the metal sintered body having excellent structural and mechanical strength is obtained.

In addition, when sintering the preform 26 to produce a porous metal, only the melting temperature of the micrometallic yarn 20 is considered and the sintering process is performed properly at the temperature level just before the melting temperature of the metal. It is understood that the yarn 20 itself is completely melted so that there is no problem of agglomeration into a certain sized mass without pores, and thus, the pores formed in the porous metal are intricately intertwined with each other to form a very complicated passage. have.

As described above, the porosity of the porous metal is greatly improved, and the pore structure also has a complicated passage structure in which the pore structure is tightly intertwined, so that the amount of fragrance penetrating through the porous metal and the duration of the fragrance due to the fragrance metal are produced. Of course, even when the porous metal is used as a gas filter or membrane support, the adsorption capacity and the amount of adsorption of foreign matter through pores can be greatly improved, thereby making the product manufactured by the porous metal. It will also contribute greatly to securing external competitiveness.

1 is a process block diagram of the present invention.

2 and 3 are a perspective view and a side view of a metal base material used in the present invention.

Figure 4 (a) and (b) is a plan view and a side cross-sectional view showing a cutting unit structure of the bite used in the present invention.

5 and 6 are a plan view and a partial side cross-sectional view showing a state of processing a metal base material on a lathe.

Figure 7 (a) to (c) is an enlarged perspective view showing the fine metal yarn manufactured by the present invention by type.

Figure 8 is an enlarged photo of the fine metal yarn produced by the present invention.

9 and 10 are side cross-sectional view of the press mold used in the porous metal manufacturing method according to the present invention.

Figure 11 is an enlarged photograph showing a cut surface of the porous metal produced by the present invention.

<Explanation of symbols for main parts of drawing>

1: metal base material 2: hollow part 3: incision groove

4 cutting piece 5 buffer hole 6 bite

7: diamond tip 8: main cutting edge 9: auxiliary cutting edge

10: lathe 11: tool stand 11a: fixing bolt

12: carriage 13: chuck 14: drive shaft

15: jao 16: spacer 17: interstitial

20: fine metal yarn 21: upper press 22: lower press

23: upper mold 23a, 24a: forming surface 24: lower mold

25 heating coil 26 preform 27 guide rod

Claims (6)

In the manufacturing method of the fine metal yarn to be a material of the porous metal, Metal base material forming step (S1) for forming a shelf fixing hollow portion (2) in the center of the metal base material (1) to be a metal plate of 0.5mm ~ 3mm thickness, After the metal base material forming step (S1), the metal base material 1 is mounted on the chuck 13 of the shelf 10, while the cutting surface of the tool base 11 of the shelf 10 is 0 ° (horizontal). And a step (S2) for setting the machining lathe to mount the bite 6 inclined downward at an angle of 15 °, such that the outer circumferential surface of the metal base material 1 comes into close contact with the cutting edge of the bite 6; After passing through the machining lathe setting step S2, the metal base 1 mounted on the chuck 13 is rotated on the shelf 10, while the bite 6 mounted on the tool post 11 is moved onto the metal base material ( 1) cutting the pipe-like micrometallic yarn 20 having a length of 0.5 mm to 3 mm and a diameter of 0.05 mm to 0.3 mm by passing the metal base material cutting step S3 for transferring to the side to cut the outer peripheral surface of the metal base material 1. A method of producing a pipe-type micrometallic yarn, which is obtained as a chip. The method of claim 1, wherein the metal base material forming step (S1) is formed radially along the circumferential portion of the metal base material 1 to the cutting grooves (3) radially, the periphery of the metal base material (1) is fan-shaped Pipe-type micrometallic yarn manufacturing method, characterized in that to be divided into a plurality of cutting pieces (4) having. 3. The bite according to claim 1, wherein in the working lathe setting step S2, the bite is interposed between the lower side of the bite 6 engaging with the tool post 11 of the lathe 10. The lower side of (6) is set to be spaced apart from the tool post 11 with a clearance gap 17 of 0.1mm ~ 1mm, characterized in that the pipe-type micrometallic yarn manufacturing method. In the method for producing a porous metal to be a material of the aromatic metal, Metal base material forming step (S1) for forming a shelf fixing hollow portion (2) in the center of the metal base material (1) to be a metal plate of 0.5mm ~ 3mm thickness, After the metal base material forming step (S1), the metal base material 1 is mounted on the chuck 13 of the shelf 10, while the cutting surface of the tool base 11 of the shelf 10 is 0 ° (horizontal). ) And a step (S2) of the work lathe for mounting the bite 6 which is inclined downward to 15 ° so that the outer circumferential surface of the metal base material 1 comes into close contact with the cutting edge of the bite 6; After passing through the machining lathe setting step S2, the metal base 1 mounted on the chuck 13 is rotated on the shelf 10, while the bite 6 mounted on the tool post 11 is moved onto the metal base material ( 1) cutting the pipe-like micrometallic yarn 20 having a length of 0.5 mm to 3 mm and a diameter of 0.05 mm to 0.3 mm by passing the metal base material cutting step S3 for transferring to the side to cut the outer peripheral surface of the metal base material 1. Obtained as a chip, A fine metal yarn input step (S11) of inserting a fiber mass of the fine metal yarn 20 manufactured through the metal base material cutting step (S3) into a molding surface of a press mold; After the fine metal yarn injection step (S11), by pressing the fiber mass of the fine metal yarn (20) using a press mold, the preform (condensed) of the fiber mass of the fine metal yarn (20) ( 26 press forming step (S12) to manufacture, After the press molding step (S12), the preform 26 is charged to the sintering furnace and heated and sintered until just before the melting point of the base metal, characterized in that it is made through a sintering treatment step (S13) for producing a porous metal. Porous metal production method using a pipe-type micrometallic yarn. The method of claim 4, wherein the metal base material forming step (S1) is formed radially along the circumference of the metal base material 1 at regular intervals, so that the periphery of the metal base material 1 is fan-shaped Pipe-type micrometallic yarn manufacturing method, characterized in that to be divided into a plurality of cutting pieces (4) having. 6. The bite according to claim 4 or 5, wherein in the working lathe setting step S2, the bite is interposed between the lower surface of the bite 6 engaged with the tool post 11 of the lathe 10. The lower side of (6) is set to be spaced apart from the tool post 11 with a clearance gap 17 of 0.1mm ~ 1mm, characterized in that the pipe-type micrometallic yarn manufacturing method.

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