• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    A METHOD FOR MANUFACTURING SINTERED PRODUCTS FROM ELECTRIC WIRE MATERIALS, including loading the powder into the pass stamp and hot pressing the profile by compacting and sintering by passing the electric current in the longitudinal direction, characterized in that, in order to improve the quality of the products obtained, the process is continuously the transmission of electric current is carried out after reaching a degree of compaction of 50-75%.
    公开号:SU1050552A3
    申请号:SU802863758
    申请日:1980-01-04
    公开日:1983-10-23
    发明作者:Лихтингхаген Клаус
    申请人:Глациер Гмбх-Дефа Верке (Фирма)；
    IPC主号:
    专利说明:

    The invention relates to nopojuKo metallurgy, in particular, to methods for producing sintered articles from electrically conductive materials by continuous hot pressing of powders. A known method of manufacturing sintered products in the form of rods by pressing portions of powder in a continuous cross section die matrix, subsequent induction sintering and additional hot reduction. The disadvantage of this method is the low productivity of the process, which requires separate pressing and sintering operations. heating of the compressed rod and the limited process possibilities associated with the fact that induction heating devices can not be used for The most suitable for the technical essence and the achieved effect to the proposed method is the manufacture of sintered products from electrically conductive materials, including the loading of powder into the pass stamp and hot profile pressing by compaction and sintering by direct transmission of electric current in the longitudinal direction 2 The disadvantage of this method is that with continuous process maintenance, the resulting products have a low quality in terms of mechanical properties and uniform sintering of the pressed material. The purpose of the invention is to improve the quality of the products obtained while continuously conducting the process. This goal is achieved by the fact that according to the method of making sintered products from electrically conductive materials, including loading the powder into the pass stamp and hot profile pressing by compacting and sintering by passing an electric current in the longitudinal direction, degrees of compaction of 50-75%. The essence of the proposed method lies in the fact that the powder of an electrically conductive material is loaded into the pass stamp and is continuously compacted in it at the same time moving through the die die and heating by direct passing an electric current in the longitudinal direction, the current passing after reaching the degree of compaction of 50-75%. Fig. 1 shows a variant of a hot continuous pass Fig. 65 is a variant of pressing in the manufacture of a hollow product. A filling plate 1 is installed above the die: with a passage 2, surrounded by a matrix 3 of non-conducting electricity, preferably ceramics eskogo material which is held outside retaining wall 4. At the lower end openings of the through passage 2 SET lena nozzle 5 having a radially inwardly tapering calibrating .ie.Opornoe Orifice ring 6 serves to sense the current in the nozzle 5 effort during vschavlivani process. The extruded material 7 seals s. With a punch 8 in the passage channel 2 of the stamp on top. The punch 8 and the nozzle 5 are connected to the poles of the voltage source (nonKasaHdj. In the manufacture of products from a continuous section, the punch 8 is used as a counter-contact, and the electric current is switched on only at the moment when the pressed material reaches a density of 50%, After the punch 8 performs a full stroke of the seal, it rises up again, as a result of which the passage of the material 7 inside the punch channel 2 of the stamp is interrupted. From above, a new batch of powder is loaded through the filling plate 1 and compacted punch B in the course of the new downward movement of the latter. Thus, continuous manufacture of products by pressing and simultaneous sintering under high pressure is carried out. In the case of pressing tubular products (Fig. 2), instead of a single pressure punch 8, the pressing unit is designed as a central mandrel 9 and covering its sleeve 10, spraying on the intermediate plate 11. and the crossbar 12. In the cross member 12 s. the guide pins 14 are screwed in by means of the threaded joint 13, which serve to guide the intermediate plate 11 while counter-moving relative to the cross member. Disc springs 15 are installed around the pins 13, by means of which the cross member 12 and the plate 11 are kept at a certain distance from each other. The guide pins 14, for precise direction, fit into the guide sleeves 16 pressed into the plate 11. The electrical insulation between the plate 11 and the crossbar 12 is reached by means of a thin-walled sleeve 17. The mandrel 9 has a working section 18, which is surrounded in the hot-pressed zone by a ceramic sleeve 19. Instead of a current-carrying punch, a contact in the form of a ring 20, installed o in the matrix on the mandrel 9 and connected to the nozzle 5 and the pole of the voltage source. Example 1. A powder mixture is continuously loaded into the continuous stamp: 88 wt.% Of iron and 12 wt.% Of graphite, which is compacted. After reaching a degree of compaction of 50%, an electric current of 40 A / cm is passed in the longitudinal direction through the material to be pressed. Until the end of the compaction process, the current strength is up to 200 A / cm. A tubular sintered product with an inner diameter of 45 mm, a compaction degree of 98%, a compressive strength of 320 I / mm and a tensile strength of 650 I / mm are continuously withdrawn from the punch. . Example 2 is repeated with the difference that the powder mixture is loaded into the feedthrough: 90 wt. bronze containing 13 wt. % tin and 10 wt. % graphite, and leading the tone, start after the compaction degree reaches 75%. In this case, the current has a strength of 150 A / cm, which is increased to 700 A / cm until the end of the sealing process. The resulting tubular product with an internal diameter of 45 mm has the following characteristics: Compaction level 100% Compressive strength 350 N / mmG Tensile strength 680 N / mm P p. Measure 3. Example 1 is repeated with the difference that the current supply is started after reaching the degree of compaction of 45%. At the same time, a tubular product with an internal diameter of 45 mm is obtained, having the following characteristics: Compaction degree 95% „Compressive strength 255 th / mm; tensile strength 540 N / mm. EXAMPLE 4. Example 2 the difference is that the current supply starts after the degree of compaction reaches 80%. A tubular product with an inner diameter of 45 mm is obtained, having the following characteristics: Compaction level 92% Compressive strength 215 N / mm Tensile strength 490 N / mm. Comparison of the data in the examples shows that pre-compaction to a density of 50-75% makes it possible to improve the physicomechanical characteristics of the products obtained. This is due to the fact that high-quality sintering takes place in the section of the pressed material with a density from 50-75% to the density of the finally compacted material, resulting in a uniform density distribution, which prevents the formation of threads in a product of any length. The proposed method allows the use of increasing intrinsic resistance of electrically conductive materials with a decrease in density for their own heating using high thermal compressive strength. At the same time, the temperature inside the compacted compressible material of the product is reduced from punch to nozzle, which is a lower electrode, since there is the most / most compaction in the area of the nozzle and at the same time the most conditions are created. full contact closure. The need for current to flow after it has been preliminary lowered to a density of at least 50%. when the puan is passed half way through his path, it is caused by the fact that the powder sticks to the contacts and that it doesn’t increase the quality of the pressed material.

    W / m
    权利要求:
    Claims (1)
    [1]
    METHOD FOR PRODUCING SINTERED ITEMS FROM ELECTRIC WIRING MATERIALS, including loading powder into a through die and hot profile pressing by compaction and sintering by direct transmission of electric current in the longitudinal direction, characterized in that, in order to improve the quality of the products obtained during continuous process, electric current transmission carried out after reaching a degree of compaction of 50-75%.
    SU m 1050552 FIG 1>
    类似技术:
    公开号 | 公开日 | 专利标题
    SU1050552A3|1983-10-23|Method for making sintered products from electrically conducting materials
    US2289787A|1942-07-14|Production of shaped articles from metal powder
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    US2123778A|1938-07-12|Electric wire
    DE2235703C3|1975-01-16|Power supply to a ceramic electrode of a melting furnace
    US2039760A|1936-05-05|Method of forming electrical resistor heating elements
    DE2443779B2|1976-08-05|METHOD OF MANUFACTURING A MAGNETITE ARTICLE
    EP0337930B1|1993-04-28|Process and apparatus for the preparation of shaped ceramic bodies
    SU582909A1|1977-12-05|Method of making sintered articles
    同族专利:
    公开号 | 公开日
    JPS5834523B2|1983-07-27|
    AT6348T|1984-03-15|
    SE7910582L|1980-07-31|
    EP0013747B1|1984-02-22|
    US4420294A|1983-12-13|
    JPS55131105A|1980-10-11|
    CS222170B2|1983-05-27|
    DE2903510C2|1981-06-25|
    DE2903510B1|1980-08-07|
    US4380473A|1983-04-19|
    EP0013747A1|1980-08-06|
    DD160099A5|1983-05-04|
    ZA8091B|1980-12-31|
    引用文献:
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    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    DE2903510A|DE2903510C2|1979-01-30|1979-01-30|Process and device for the continuous extrusion of electrically conductive granulated, preferably powder metallurgical materials|
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