JP2012200946A - Extrusion molding machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an extrusion molding machine capable of obtaining a molding with fewer remaining bubbles by sufficiently deaerating a raw material inside a vacuum chamber.SOLUTION: The extrusion molding machine 1 has a vacuum chamber 6 between an upper stage screw 4 and a lower stage screw 8 for kneading and extruding the raw material, and in the extrusion molding machine 1, a shredding tool 5 for shredding the raw material crossing the flowing direction of the raw material is provided in front of the vacuum chamber 6. When the extrusion molding machine 1 is used, since the raw material can be sufficiently deaerated inside the vacuum chamber 6 by shredding the raw material, the molding with fewer remaining bubbles is obtained. Thus, the molding has fewer risks of producing cracks during baking or producing defects of a pinhole or the like in an obtained sintered body.

Description

  The present invention relates to an extrusion molding machine used for molding a molded body such as a rod or cylinder.

  Conventionally, an extrusion molding method has been used as a molding method for obtaining a continuous molded body having the same cross-section, such as a rod or cylinder, and an extrusion molding machine having a vacuum chamber between screws has been used as the apparatus. It has been. In this extrusion molding machine, if gas is contained in the raw material, the gas remains in the resulting molded body as bubbles, and when the molded body in which the remaining bubbles are present is fired, cracks and cracks are generated. This may cause defects such as pinholes in the obtained sintered body. Therefore, the vacuum chamber is decompressed with a vacuum pump connected to the vacuum chamber, so that the gas contained in the raw material is removed. Qi is done.

  However, simply depressurizing the inside of the vacuum chamber is insufficient for degassing. Therefore, by installing a plate having a through hole in front of the vacuum chamber and passing the through hole, the raw material is flowed in the direction of the raw material. For example, in an extrusion molding machine described in Patent Document 1, two rectifying plates having through holes with different diameters are provided in front of the vacuum chamber. It is described that the installation reduces the bubbles remaining in the molded body.

JP-A-1-128806

  However, in the method of dividing the raw material in the flow direction of the raw material by passing the through hole of the baffle plate in the front of the vacuum chamber as in the extrusion molding machine described in Patent Document 1, deaeration is not yet sufficient. .

  In addition, in order to solve the above problem, if the hole diameter of the through-hole of the rectifying plate is made small so as to divide the raw material in the direction of flow of the raw material, the resistance applied when extruding the raw material increases, Another problem arises that it cannot withstand this resistance and breaks. In addition, if the amount of the binder is increased to reduce the viscosity of the raw material so as not to increase this resistance, the shape retention of the molded body after molding is reduced, or the molded body is greatly deformed during drying or subsequent firing. Yet another problem arises.

  The present invention has been devised to solve the above problems, and provides an extrusion molding machine capable of obtaining a molded body with few remaining bubbles by sufficiently degassing a raw material in a vacuum chamber. With the goal.

  The extrusion molding machine of the present invention is an extrusion molding machine having a vacuum chamber between screws that knead and extrude the raw material, and a shredding jig that cuts the raw material across the flow direction of the raw material is the vacuum. It is provided in the front of the room.

According to the extrusion molding machine of the present invention, the shredding jig that shreds the raw material intersecting the flow direction of the raw material is provided in front of the vacuum chamber, so that the raw material is shredded in the vacuum chamber. Since the raw material can be sufficiently degassed, a molded body with few remaining bubbles can be obtained.

It is a schematic sectional drawing which shows an example of the extrusion molding machine of this embodiment. An example of the shredding jig | tool which comprises the extrusion molding machine of this embodiment is shown, (a), (b) is a top view, (c) is when the shredding jig in (b) is provided in the screw It is a schematic side view which shows an example. It is a schematic side view which shows the other example when the cutting tool which comprises the extrusion molding machine of this embodiment is provided in the screw.

  Hereinafter, an example of the extrusion molding machine of this embodiment will be described.

  FIG. 1 is a schematic cross-sectional view showing an example of an extrusion molding machine according to the present embodiment. The extrusion molding machine 1 of the example shown in FIG. 1 has the upper stage screw 4 and the lower stage screw 8 which knead | mix and extrude a raw material in an upper stage and a lower stage, respectively, and has the vacuum chamber 6 between these.

  A raw material inlet 2 is opened in a part of the upper barrel portion 3. Further, the upper barrel portion 3 has two upper screws 4 formed of a shaft 4a and blades 4b in parallel (two in a direction perpendicular to the paper surface in FIG. 1). And in the lower barrel part 7, it has the lower stage screw 8 which consists of the shaft 8a and the blade | wing 8b, and the metal mold | die 9 is connected to the exit side of the lower stage barrel part 7. FIG.

  The upper stage screw 4 is connected and fixed to the upper stage bearing 10 on both sides, the lower stage screw 8 is connected and fixed to the lower stage bearing 11 with one side support, and the upper stage screw 4 and the lower stage screw 8 are connected to a power source (not shown). A vacuum chamber 6 is provided between the upper screw 4 and the lower screw 8, and a vacuum pump (not shown) for reducing the pressure in the vacuum chamber 6 is connected to the vacuum chamber 6.

  In the present embodiment, it is important that a shredding jig 5 is provided in front of the vacuum chamber 6 so as to cross the raw material flow direction and shred the raw material. 1 shows an example in which the shredding jig 5 is provided on the shaft 4a of the upper stage screw 4. However, the present invention is not limited to this, and the upper stage screw 4 shreds the blade 4b on the vacuum chamber 6 side. The tool 5 may be provided. Further, the place where the shredding jig 5 is provided is not limited to the shaft 4 a or the blade 4 b of the upper screw 4, but may be provided in front of the vacuum chamber 6 between the upper screw 4 and the lower screw 8. For example, in FIG. 1, a shredding jig 5 that is driven by using another power source is provided between the upper barrel 3 and the upper bearing 10 that hits the downstream side of the upper screw 4 in the raw material flow. May be. However, a shredding jig 5 is provided in the upper screw 4 in that the raw material can be shredded in front of the vacuum chamber 6 so as to intersect the flow direction of the raw material without requiring another power source. It is preferable that In the following description, when the shredding jig 5 is provided on the shaft 4 a of the upper screw 4, the shredding jig 5 is simply provided on the upper screw 4.

  Next, the molding procedure of the molded body using the extrusion molding machine 1 of the embodiment of the example shown in FIG. 1 will be described. First, powder, a binder, and water are mixed and kneaded to obtain a clay-like raw material. And this raw material is thrown in from the inlet 2 of the extrusion molding machine 1, and the two upper stage screws 4 are mutually connected so that a raw material may be wound between the upper stage screws 4 installed in parallel in the upper stage barrel part 3. By rotating in reverse, the charged raw material is kneaded and pushed forward while passing through the gap between the blade 4b and the inner wall of the upper barrel portion 3.

  Then, the pushed raw material is chopped across the flow direction of the raw material and sent to the vacuum chamber 6 by a chopping jig 5 provided on the upper screw 4 and rotating together with the upper screw 4. The shredded raw material is degassed in the vacuum chamber 6 by depressurizing the vacuum chamber 6 with a vacuum pump connected to the vacuum chamber 6. Thereafter, the raw material is pushed by the rotation of the lower screw 8 through the gap between the blade 8 b and the inner wall of the lower barrel portion 7, and is pushed in the direction of the mold 9. A shaped body having a shape is obtained. And a sintered compact can be obtained by drying and baking this molded object.

  The extrusion molding machine 1 according to the present embodiment is provided with a shredding jig 5 for shredding the raw material so as to intersect the raw material flow direction in front of the vacuum chamber 6. Since the raw material can be sufficiently degassed in the vacuum chamber 6 by chopping the raw material, compared with the case where deaeration is performed by dividing in the direction, it is possible to obtain a molded body with few remaining bubbles. Can do. In addition, this molded body with few remaining bubbles is less likely to cause cracks or cracks during firing, such as when the raw material is made of ceramics, or to cause defects such as pinholes in the sintered body obtained after firing. Therefore, it is particularly suitable for manufacturing large and long products.

  The shredding jig 5 provided in the upper screw 4 in front of the vacuum chamber 6 of the extruder 1 having the above-described configuration may be provided integrally with the upper screw 4, but is attached to and detached from the upper screw 4. It is preferable that it is attached to be possible.

  2, (a) and (b) are plan views showing an example of a shredding jig constituting the extruder 1 of the present embodiment. (C) is a schematic side view showing an example when the shredding jig in (b) is provided on the upper screw. In addition, the arrow in a figure shows the flow direction of a raw material.

  The shredding jig 5 in the example shown in FIG. 2 includes a shredding portion 5a and a base 5b. FIG. 2A shows a shredding jig 5 in which a shredding portion 5a and a base 5b are integrally formed. FIG. 2B shows a shredding jig 5 in which a shredding portion 5a and a base 5b are formed, and the shredding portion 5a is attached to the base 5b. As a method of fixing the chopped portion 5a to the base 5b, for example, a plurality of recesses are provided in the base 5b, and a screw hole is provided in which the internal thread is processed. A through screw hole having been subjected to the above is provided in the shredded portion 5a, and a screw is passed through a bolt to a through screw hole provided in the shredded portion 5a and a screw hole provided in a concave portion of the base 5b.

  Further, as a method of fixing the shredding jig 5 shown in FIGS. 2 (a) and 2 (b) to the upper screw 4, a screw hole subjected to female threading is provided in the upper screw 4, and the diameter is the same as this screw hole. A through screw hole that has been subjected to female thread processing is provided in the base 5b, and a bolt is passed through the through screw hole provided in the base 5b and the screw hole provided in the upper stage screw 4 by screwing. Alternatively, a key groove may be provided on the upper screw 4 and a key may be provided on the base 5b, and these may be fitted and fixed. The detachable shredding jig 5 is not limited to the configuration shown in FIG. 2, and a plurality of recesses are provided in the upper screw 4, and the shredding part 5 a is shredded and cured by the same fixing method described above. Needless to say, the tool 5 includes those provided in the upper screw 4.

In the example shown in FIG. 2, since the shredding jig 5 is detachably attached to the upper screw 4, the degree of wear due to friction with the raw material is, for example, smaller than that of the blade 4 b of the upper screw 4. When it differs from the cutting jig 5, it is possible to perform partial replacement such as only the upper screw 4 or only the cutting jig 5, and it is easy to remove the cutting jig 5. Running costs can be reduced. Moreover, as shown in FIG.2 (b), the shredded part 5a and the base 5b are integrally formed by attaching the shredded part 5a to the base 5b so that attachment or detachment is possible. Compared with the configuration of (a), it is preferable that only the shredded portion 5a that is worn can be replaced, and that maintenance costs and running costs can be further reduced.

  Moreover, about the shredding part 5a of the shredding jig 5, the raw material can be shredded more by increasing the number of installations, but when the number of shredding parts 5a is increased, the extrusion speed of the raw material becomes slow. Therefore, when the extrusion pressure is increased in order to maintain the extrusion speed, the shredded portion 5a is likely to wear due to friction with the raw material. Therefore, the number of shredded portions 5a to be installed may be 6-18. preferable.

  As shown in FIG. 2, when the shredding jig 5 has a base 5b, the base 5b has a diameter larger than that of the shaft 4a. The surface facing the surface is likely to be worn by friction with the raw material, and there is a risk that the resistance applied when the raw material is pushed out increases. Therefore, it is preferable to have a member that can reduce wear due to friction with the raw material without increasing the resistance applied when the raw material is extruded.

  FIG. 3 is a schematic side view showing another example when the shredding jig is provided on the upper screw. The shredding jig 5 of the example shown in FIG. 3 is provided on the upper stage screw 4 together with the shredding part 5a and the base 5b, and the diameter increases along the flow direction of the raw material until it becomes the same as the base 5b. A tapered portion 5c is provided. Thus, by having the taper part 5c, the abrasion by friction with a raw material can be reduced, without increasing the resistance applied when extruding a raw material.

  The surface of the taper portion 5c is preferably set to have an arithmetic average roughness Ra of 1 μm or less in order to reduce friction with the raw material. Further, the taper angle is preferably 10 to 50 ° with respect to the axis of the upper screw 4. As a method for fixing the taper portion 5c, a key groove is provided in the upper screw 4 and a key is provided in the taper portion 5c, and these are fitted and fixed, or a screw process capable of being fastened to the base 5b and the taper portion 5c is performed. And screw fastening.

  Further, as shown in FIG. 3, when the tapered portion 5c is provided, the fastening portion of the shredded portion 5a can be covered, so that compared to when the fastening portion of the shredded portion 5a is exposed. Friction with the raw material can reduce the possibility that the bolts and the screw threads of the bolts are worn and the fastening is loosened.

Next, as a material of the shredding jig 5, metals such as stainless steel, chromium steel, chromium molybdenum steel, nickel chromium steel, nickel chromium molybdenum steel, carbon tool steel and alloy tool steel, alumina, zirconia, silicon nitride Although ceramics such as silicon carbide can be used, the shredding jig 5 is preferably made of the same material as the main component of the raw material used for molding. Here, the main component of the raw material refers to a component occupying 50% by mass or more with respect to 100% by mass of all the components constituting the raw material.

  When the material of the shredding jig 5 is made of the same material as the main component of the raw material used for molding, even if the wear powder is mixed by friction with the raw material, the obtained molded body is fired to obtain a sintered body. In this case, it is possible to obtain an effect of reducing the possibility that the wear powder reacts with other components to form a reaction product, deteriorates the characteristics of the sintered body, or emits a different color tone to deteriorate the appearance. . In particular, it is preferable to use the same material as the main component of the raw material used for forming the shredded portion 5a that is heavily worn by friction with the raw material. Not only the shredded portion 5a but also the base 5b and the tapered portion 5c, or the upper screw 4. It is more preferable that the material of the member in contact with the raw material such as the inner wall of the lower screw 8, the upper barrel 3 and the lower barrel 7 is made of the same material as the raw material used for molding, since the above-described effects can be further enhanced. .

  Next, an example of the manufacturing method of the extrusion molding machine 1 of this embodiment is shown.

  Here, an example of the configuration shown in FIG. 3 for the shredding jig 5 and an example using ceramics as the material will be described. First, a primary material made of ceramics, a sintering aid, various binders, and water are weighed and mixed in predetermined amounts to form a slurry, and then granulated using a spray dryer (spray dryer) A secondary material is obtained. Then, using this secondary raw material, a molded body having a predetermined size is obtained by an isostatic press molding method (rubber press molding method), and then cut to form a base 5b and a taper portion 5c. Get.

  Moreover, the molded object used as the shredded part 5a is obtained by the powder press molding method using the same secondary raw material. And the compact | molding | casting used as the shredded part 5a, the base 5b, and the taper part 5c is put into a baking furnace, and is baked in predetermined | prescribed baking temperature in air | atmosphere atmosphere or non-oxidizing atmosphere according to a raw material. After firing, final cutting is performed by grinding to obtain a chopped portion 5a, a base 5b, and a tapered portion 5c.

  In addition, an upper screw 4 having blades 4b on the shaft 4a after being subjected to a cutting process after a molded body having a predetermined size is obtained by the hydrostatic press molding method (rubber press molding method) using the same secondary material. A molded body to be the lower screw 8 having the blade 8b on the shaft 8a is obtained. These are then placed in a firing furnace and fired at a predetermined firing temperature in an air atmosphere or a non-oxidizing atmosphere depending on the raw materials. After firing, the upper screw 4 and the lower screw 8 are obtained by final finishing by grinding. In addition, about the upper stage screw 4 and the lower stage screw 8, the shaft 4a, 8a and the blade | wing 4b, 8b may be produced separately, and a bolt fastening may be sufficient.

  Moreover, about the process of the screw hole for fixing each member etc., a through screw hole, etc., it has given at the time of cutting or grinding. Then, screws are fastened through bolts to the through screw holes provided in the chopped portion 5a and the screw holes provided in the concave portion of the base 5b. Moreover, the shredding jig | tool 5 is obtained by screw-fastening the base 5b and the taper part 5c. Further, the key groove provided on the upper screw 4 and the key provided on the base 5b and the taper portion 5c are fitted together to obtain the upper screw 4 provided with the shredding jig 5.

  Then, as shown in FIG. 1, the upper screw 4 provided with the shredding jig 5 is connected and fixed to the upper bearing 10 and installed in the upper barrel portion 3 where the insertion port 2 is partially opened. The lower screw 8 is connected and fixed to the lower bearing 11 and installed in the lower barrel portion 7, and the die 9 is connected to the outlet side of the lower barrel portion 7 to obtain the extruder 1 of the present embodiment. Can do.

  When using a metal such as stainless steel, chrome steel, chrome molybdenum steel, nickel chrome steel, nickel chrome molybdenum steel, carbon tool steel or alloy tool steel as the material of the shredding jig 5, a drilling machine, a surface grinding machine, What is necessary is just to produce each member using machine tools, such as a universal grinder.

  The extrusion machine 1 of the present embodiment thus obtained has a vacuum chamber 6 between the upper screw 4 and the lower screw 8 that knead and extrude the raw material, and finely cut the raw material across the flow direction of the raw material. Since the shredding jig 5 to be cut is provided in front of the vacuum chamber 6, the raw material is shredded as compared with the conventional case where the degassing is performed by dividing in the raw material flow direction. As a result, the raw material can be sufficiently deaerated in the vacuum chamber 6, so that a molded body with few remaining bubbles can be obtained. And the molded body with few remaining bubbles can reduce the risk of cracks and cracks occurring during firing, and the possibility of defects such as pinholes occurring in the sintered body obtained after firing. It is particularly suitable for the production of scale products.

  First, the shredding jig 5 in which the shredding part 5a and the base 5b of the example shown in FIG.

85% by mass of a primary material made of silicon nitride having an average particle diameter of 1 μm and 15% by mass of a sintering aid such as Y ₂ O ₃ and Al ₂ O ₃ are weighed, and the primary material and the sintering aid. For a total of 100% by mass,
Weigh 1% by weight of binder, 100% by weight of solvent, and 0.5% by weight or less of dispersing agent, put them in a stirrer container, mix and stir to make a slurry, ) To obtain a secondary raw material that is a granulated granule. And using this secondary raw material, it shape | molded by the isostatic press molding method (rubber press method), and gave the cutting process. Thereafter, this was fired in a firing furnace at a maximum temperature of 1900 ° C. in a nitrogen atmosphere. After firing, final cutting such as grinding was performed to obtain a shredding jig 5 made of a silicon nitride sintered body. And the extrusion molding machine 1 which attached the shredding jig | tool 5 of the upper stage screw 4 shown in FIG. 1 was prepared.

  Further, a current plate having 80 through holes was prepared, and an extrusion molding machine was prepared in which this current plate was installed at the same position where the shredding jig 5 was attached.

Next, the raw material which has silicon nitride as a main component used for extrusion molding was prepared. The viscosity of this raw material is constant load extrusion type rheometer (Shimadzu Flow Tester CFT-500, manufactured by Shimadzu Corporation).
C) was 0.1 MPa · s. Then, using this raw material, extrusion molding was performed with an extrusion molding machine 1 equipped with a shredding jig 5 and an extrusion molding machine equipped with a current plate.

Then, after drying the obtained molded body at 100 ° C. for 48 hours, putting it in a large firing furnace and firing it at a maximum temperature of 1600 ° C. in the air atmosphere, there are no cracks on the surface of the sintered body. After confirming the appearance, the sintered body was placed in a water tank, and the number of defects existing on one surface in the length direction was confirmed using an ultrasonic flaw detector. In addition, the measurement by an ultrasonic flaw detector (made by Jeanes Co., Ltd.) is performed under the conditions of a measurement distance of 30 to 100 mm, a probe output of 15 MHz, a scanning pitch of 1 mm, and a detection frequency of 500 MHz, and appears on the chart obtained by this measurement. The number of defects was counted. In addition, this defect is a crack, a crack, a pinhole, etc. which exist in a sintered compact, and if there are few these defects, it can be paraphrased that there are few bubbles which remain | survive in a molded object.

  As a result, the molded body molded by the extrusion molding machine 1 equipped with the shredding jig 5 of this embodiment is fired against the sintered body obtained by firing the molded body molded by the extrusion molding machine provided with the current plate. The number of defects in the sintered body was less than half as measured by an ultrasonic flaw detector. Thereby, since the extrusion molding machine 1 of the present embodiment is provided with the shredding jig 5, defects such as cracks, cracks and pinholes are reduced in the sintered body, so molding with less residual bubbles. I found that I was able to get a body.

  The shredding jig 5 in which the shredding portion 5a and the base 5b of the example shown in FIG. 2A are integrally formed is manufactured, and the upper stage screw 4 is placed at the position of the shredding jig 5 shown in FIG. An attached extrusion molding machine 1 (No. 1 machine) was prepared. Further, the shredding jig 5 in which the shredding portion 5a and the base 5b of the example shown in FIG. 2B are formed respectively and the shredding portion 5a is attached to the base 5b is produced, and FIG. An extrusion molding machine 1 (No. 2 machine) attached to the upper screw 4 at the position of the shredding jig 5 shown was prepared. Further, the upper screw 4 is integrally formed with a chopping portion 5a having the same size as that of FIG. 2A as the chopping jig 5, and the extruder 1 (No. 3 machine) in which the upper screw 4 is installed. Prepared. And extrusion molding was implemented using the extrusion molding machine 1 of 1-3 machines.

  As a result, the degree of wear of the shredded portion 5a or the portion hitting the shredded portion 5a was almost the same, but the No. 3 machine can use the shaft 4 and the blade 4b, but the upper screw 4 Since the chopped portion 5a is integrally formed, it is necessary to replace the upper screw 4. In Unit 1, the shredding jig 5 in which the shredding portion 5a and the base 5b are integrally formed is detachably attached to the upper screw 4, so that the shredding jig 5 can be replaced. It was good. In No. 2, the shredding jig 5 has a shredding part 5a and a base 5b, and the shredding part 5a is attached to the base 5b. I should have exchanged.

  From the above results, in order to reduce maintenance costs and running costs, it is preferable that the shredding jig 5 is detachably attached to the upper screw 4, and further, the shredding portion 5a is detachable. It has been found that it is more suitable to be attached.

  The shredding jig 5 in which the shredding part 5a and the base 5b in the example shown in FIG. 2 (b) are respectively formed and the shredding part 5a is attached to the base 5b is produced, and the shredding jig 5 shown in FIG. An extruder 1 (No. 4 machine) prepared on the upper screw 4 at the position of the cutting jig 5 was prepared. Further, together with the shredding part 5a and the base 5b of the example shown in FIG. 3, a shredding jig 5 having a taper part 5c was produced and attached to the upper screw 4 at the position of the shredding jig 5 shown in FIG. An extrusion molding machine 1 (No. 5 machine) was prepared. And extrusion molding was implemented using the extrusion molding machine 1 of No. 4 and 5.

  As a result, the No. 5 machine had less increase in resistance when extruding the raw material after the start of molding than the No. 4 machine. Moreover, when it confirmed after continuous shaping | molding, abrasion was confirmed by the surface facing the flow direction of the raw material in the base 5b of No. 4 machine. Therefore, it has been found that by having the tapered portion 5c, it is possible to reduce wear due to friction with the raw material without increasing the resistance applied when extruding the raw material.

  A primary raw material made of alumina, a sintering aid, various binders and water are weighed and mixed in predetermined amounts to form a slurry, which is then granulated using a spray dryer (spray dryer). A secondary material was produced. Then, using this secondary material, a molded body of a predetermined size is obtained by an isostatic press molding method (rubber press molding method), and then a molded body to be a shredding jig 5 is obtained by cutting. It was. And the molded object used as the shredding jig | tool 5 was put into the baking furnace, and it baked in air | atmosphere atmosphere. After firing, final cutting was performed by grinding to obtain a chopping jig 5 made of an alumina sintered body. Moreover, the metal material was processed with machine tools, such as a drilling machine, a surface grinder, and a universal grinder, and the metal cutting tool 5 was obtained.

  And the extrusion machine 1 attached to the upper stage screw 4 in the position of the shredding jig | tool 5 shown in FIG. 1, respectively was prepared. And it extrusion-molded using each extrusion molding machine 1 using the raw material which has an alumina as a main component. Thereafter, when the obtained molded bodies were fired, spots that differ in color tone were confirmed on the sintered bodies fired of the molded bodies molded by the extrusion molding machine 1 equipped with the shredding jig 5 made of metal. It was. When this part was analyzed by ICP emission spectroscopic analysis, it was preferable that the shredding jig 5 was made of the same material as the main component of the raw material because the metal that was the material of the shredding jig 5 was detected. all right.

1: Extruder 2: Input port 3: Upper barrel 4: Upper screw 4a: Shaft 4b: Blade 5: Shredding jig 5a: Shredding part 5b: Fixed part 5c: Tapered part 6: Vacuum chamber 7: Lower barrel 8: Lower screw 8a: Shaft 8b: Blade 9: Mold
10: Upper bearing
11: Lower stage bearing

Claims (4)

An extrusion molding machine having a vacuum chamber between screws that knead and extrude the raw material, and a shredding jig for chopping the raw material across the flow direction of the raw material is provided in front of the vacuum chamber An extrusion machine characterized by The extrusion molding machine according to claim 1, wherein the shredding jig is provided on the screw. The extrusion molding machine according to claim 1 or 2, wherein the shredding jig is detachably attached. 4. The extrusion molding machine according to claim 1, wherein the shredding jig is made of the same material as the main component of the raw material.

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