JP2007038418A - Press molding method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a press molding method constituted so as to suppress an increase in an equipment cost to reduce the occurrence of burr. <P>SOLUTION: After a molding material 1 is placed on a receiving tray 2, the receiving tray 2 is placed on a lower mold 3 along with the molding material 1 to be set to the lower mold 3. After the molding material 1 is subjected to press molding between the lower mold 3 and an upper mold 4, the press-molded product 5 of the molding material 1 is demolded along with receiving tray 2. Since the molding material 1, the press-molded product 5 thereof and the receiving tray 2 are formed as one set to be subjected to handling, it is unnecessary to increase the number of the lower molds 3. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a press molding method for molding a ceramic molding material mainly composed of a hydraulic material such as cement.

  Conventionally, a molding material containing cement and water has been molded by pressing (see, for example, Patent Document 1). FIG. 3 shows an example of a molding material press molding method. In this method, first, as shown in FIG. 3A, a predetermined amount of the molding material 1 is placed on the upper surface (molding surface) of the lower mold 3 set in the press molding machine 10. Next, as shown in FIG. 3B, the upper mold 4 set in the press molding machine 10 is moved down and clamped, and the molding material 1 is sandwiched between the lower mold 3 and the upper mold 4. Press-mold. Next, as shown in FIG. 3C, the upper mold 4 is moved upward to open the mold, and as shown in FIG. 3D, the press-molded product 5 of the molding material 1 is removed from the lower mold 3. After that, the press-formed product 5 is cured and cured.

  However, when the molding material 1 is directly put into the molding surface of the lower mold 3 of the molding die in this way and only the press-molded product 5 is taken out from the die after the press molding, the molding material 1 is soft before the curing and kept. Since the formability is low, the press-formed product 5 collapses during handling, and it is almost impossible to take out only the press-formed product 5 from the mold.

  Therefore, it has been proposed to handle the molding material 1 in a state of being placed on the lower mold 3. That is, as shown in FIG. 4A, after the molding material 1 is placed on the lower mold 3 of the molding die, the lower mold 3 is put together with the molding material 1 as shown in FIG. It is put into the press molding machine 10 and set. Next, as shown in FIG. 4C, the upper mold 4 set in the press molding machine 10 is moved down and clamped, and the molding material 1 is sandwiched between the lower mold 3 and the upper mold 4. Press-mold. Next, as shown in FIG. 4D, the upper mold 4 is moved upward to open the mold, and the press-molded product 5 of the molding material 1 is taken out from the press molding machine 10 in a state of being placed on the lower mold 3. . Thereafter, the press-molded product 5 is cured and cured while being placed on the lower mold 3, and the press-molded product 5 is removed from the lower mold 3 after curing and curing, as shown in FIG. 4 (e).

However, in this method, since the molding material 1 and its press-molded product 5 and the lower mold 3 are handled as a set, there is a problem that the required number of the lower molds 3 is increased and the equipment cost is increased. In addition, since a large number of lower molds 3 are sequentially rotated and used, the clamping accuracy with the upper mold 4 is lowered, and the molding material 1 leaks from the clearance between the upper mold 4 and the lower mold 3 to cause burrs. There was a problem that it was likely to occur.
JP 62-236709 A

  The present invention has been made in view of the above points, and an object of the present invention is to provide a press molding method that suppresses an increase in equipment cost and generates less burrs.

  In the press molding method of the present invention, after the molding material 1 is placed on the receiving tray 2, the receiving tray 2 is placed on the lower mold 3 together with the molding material 1 and set. After the molding material 1 is press-molded, the press-molded product 5 of the molding material 1 together with the receiving tray 2 is demolded.

  In the present invention, it is preferable to provide the cushioning material 6 for closing the gap 12 with the receiving tray 2 around the lower mold 3.

  In the present invention, a cement-containing inverse emulsion composition containing cement, water, an oily substance, and an emulsifier can be used as the molding material 1.

  In the present invention, since the molding material 1 and its press-molded product 5 and the receiving tray 2 are handled as one set, it is not necessary to increase the number of the lower molds 3, and the equipment cost is increased by the lower mold 3. Can be suppressed. Moreover, the lower mold | type 3 which makes a pair with the upper mold | type 4 can be made into one, and the mold clamping precision of the lower mold | type 3 and the upper mold | type 4 can be prevented from becoming low. Therefore, it is difficult for the molding material 1 to leak from the clearance between the upper mold 4 and the lower mold 3, and the occurrence of burrs can be reduced.

  Further, the gap 12 between the lower mold 3 and the receiving tray 2 caused by machining accuracy and the like can be filled with the buffer material 6, and the molding material 1 is prevented from wrapping around the gap 12, thereby preventing the occurrence of molding defects. It is something that can be done.

  Moreover, this invention can be used suitably for the material with low shape retention property like the cement-containing inverse emulsion composition containing cement, water, an oily substance, and an emulsifier as the molding material 1. FIG.

  Hereinafter, the best mode for carrying out the present invention will be described.

  As the molding material 1 used in the present invention, a ceramic cement composition containing cement and water can be used.

  The receiving tray 2 used in the present invention is a thin metal plate formed in a shape along the molding surface of the lower mold 3 by drawing or the like. As the metal plate, stainless steel plate (SUS plate), hot dip galvanized steel plate, zinc aluminum alloy plated steel plate (GL steel plate), zinc / aluminum / magnesium alloy plated steel plate (ZAM), iron plate, etc. with a thickness of 0.8 to 3.2 mm Things can be used. Thus, by forming the receiving tray 2 with a thin metal plate drawn product, the receiving tray 2 can be manufactured at a lower cost than the lower mold 3, and a larger number of receiving trays 2 are manufactured than a large number of lower molds 3. This can reduce the equipment cost.

  And the press molding method of this invention is performed as follows. First, as shown in FIG. 1A, the molding material 1 cut into a predetermined amount by weighing or the like is placed on the receiving tray 2. The molding material 1 may be supplied to the receiving tray 2 in a sheet state, or may be supplied to the receiving tray 2 in a lump state. Next, as shown in FIG. 1B, the receiving tray 2 on which the molding material 1 is placed is placed on the lower mold 3 together with the molding material 1 and set. Here, the lower die 3 is a molding die used as a pair with the upper die 4 and is set in the press molding machine 10 in a state where the die is opened. Next, as shown in FIG. 1 (c), the upper mold 4 set in the press molding machine 10 is moved down and clamped, and the molding material 1 and the receiving tray are placed between the lower mold 3 and the upper mold 4. 2 is press-molded. By this press molding, the molding material 1 is formed into a substantially plate-like press-molded product 5 having an upper surface shaped along the molding surface (lower surface) of the upper mold 4 and a lower surface along the upper surface of the receiving tray 2. . Next, as shown in FIG. 1 (d), after the upper mold 4 is moved upward to open the mold, the press-formed product 5 is placed on the receiving tray 2 as shown in FIG. 1 (e). Remove from the lower mold 3. Thereafter, the press-molded product 5 is cured while being placed on the lower mold 3, and the press-molded product (product) 5 is removed from the receiving tray 2 after curing. The receiving tray 2 is returned to the step of FIG.

  In the present invention, in the press molding of the soft molding material 1 having a low shape retaining property, the molding material 1 is transported to the molding die while being placed on the tray 2 and supplied to or removed from the molding die. Therefore, the molding material 1 can be easily handled. Therefore, by producing a large amount of receiving trays 2 that are cheaper than the lower mold 3, it is not necessary to increase the number of lower molds 3, and an increase in equipment cost due to the lower mold 3 can be suppressed. Further, the lower die 3 paired with the upper die 4 can be united and fixed to the press molding machine 10 so that the clamping accuracy between the lower die 3 and the upper die 4 is not lowered. Can do. Therefore, it is possible to improve the machining accuracy of the meshing portion of the upper mold 4 and the lower mold 3, and it becomes difficult for the molding material 1 to leak from the clearance portion between the upper mold 4 and the lower mold 3, thereby reducing the occurrence of burrs. It is something that can be done. Further, since the press-molded product 5 is cured and cured in a state of being placed on the receiving tray 2, the deburring of the press-formed product 5 can be performed along the peripheral edge of the receiving tray 2, and the deburring process can be simplified. It is something that can be done.

  In the present invention, it is preferable to provide a cushioning material 6 for filling and closing the gap 12 with the receiving tray 2 around the molding surface of the lower mold 3. The buffer material 6 is an elastic member such as EPDM (foam elastic seal material) or rubber packing, and the material is not particularly limited. Further, as shown in FIG. 2A, the cushioning material 6 is disposed so as to surround the molding surface 3a of the lower mold 3 in a plan view, but as shown in FIG. The upper part of is provided so as to protrude slightly above the molding surface 3 a of the lower mold 3. That is, as shown in FIG. 2 (c), a concave step portion 11 that opens to the upper surface and the side surface is formed at the peripheral end portion of the lower die 3 over the entire circumference of the lower die 3. The cushioning material 6 having a substantially square cross section is fitted over the entire length of the portion 11, and the upper surface of the cushioning material 6 fitted in the recessed step portion 11 is positioned above the molding surface (upper surface) 3 a of the lower mold 3. It is in a state. When the receiving tray 2 is set on the lower mold 3 as described above, the peripheral end portion of the receiving tray 2 is placed on the buffer material 6, but the buffer material 6 is compressed and pressed by the pressure during press molding. By being crushed, the opening of the gap 12 between the lower surface of the receiving tray 2 and the molding surface 3a of the lower mold 3 is closed. Accordingly, the gap 12 between the lower mold 3 and the receiving tray 2 due to low machining accuracy can be filled and closed with the buffer material 6 so that the molding material 1 does not go into the gap 12 and can be molded. It is possible to reduce molding defects due to the wraparound of the material 1.

  In the present invention, the molding material 1 is preferably a cement-containing inverse emulsion composition containing cement, water, an oily substance and an emulsifier. This cement-containing inverse emulsion composition has better fluidity than other cement-based molding materials and can be easily molded into a complicated shape, but its shape retention property is low and it is easily deformed. Therefore, it is preferable that the receiving tray 2 as described above is used for conveyance, molding, and curing.

  The cement is not particularly limited, but Portland cement, fly ash cement, blast furnace cement, alumina cement, high alumina cement, silica fume, etc. can be used, or one kind can be used alone, or two or more kinds can be used. Can be used together.

  The oily substance is not particularly limited as long as it can form an inverse emulsion (W / O emulsion) with water, and usually a hydrophobic liquid substance is used. For example, toluene, xylene, kerosene, styrene , Divinylbenzene, methyl methacrylate, trimethylolpropane trimethacrylate, unsaturated polyester resin and the like. In particular, if an oily substance having a polymerizable double bond (vinyl monomer) such as styrene, divinylbenzene, methyl methacrylate, trimethylolpropane trimethacrylate, or unsaturated polyester resin is used, the hydration reaction of cement And an oily substance having a polymerizable double bond occur simultaneously, and the polymer forms a matrix, so that a press-formed product (cement molded product) having excellent physical and mechanical properties is obtained.

  When an oily substance having a polymerizable double bond is used, a polymerization initiator such as an organic peroxide or persulfate such as t-hexylperoxy-2 is used in order to accelerate the polymerization of the oily substance. -It is desirable to use ethyl hexanoate together. Further, a crosslinking agent such as trimethylolpropane trimethacrylate can be used in combination.

  The content of the oily substance in the cement-containing inverse emulsion composition can form an inverse emulsion with water in the cement-containing inverse emulsion composition, and desired properties are imparted to the resulting press-molded product (inorganic molded product). Thus, it is suitably adjusted, but for example, it is preferably in the range of 5 to 10% by volume with respect to the total amount of water and solid content in the cement-containing inverse emulsion composition.

  Moreover, it is preferable to mix | blend an emulsifier (reverse emulsifier) other than the said component with a cement containing inverse emulsion composition. The emulsifier is blended to impart stability to the inverse emulsion. Ionic surfactants, various anionic surfactants, cationic surfactants, and the like can be used. The content of such an emulsifier can also be adjusted as appropriate, but it is preferably in the range of 1 to 3% by volume with respect to the total amount of water and solids in the cement-containing inverse emulsion composition.

  Further, in the cement-containing inverse emulsion composition, an appropriate amount of a reinforcing material such as lightweight aggregate, silica-based aggregate, organic fiber, and various additives can be blended. Examples of lightweight aggregates include fly ash balloons, perlite, shirasu balloons, and the like, as well as organic foams such as expanded polystyrene and polyvinylidene chloride foam, and the content thereof is 20 with respect to 100 parts by mass of cement. It is preferable to set it as the range of -40 mass parts. Moreover, as a silica type aggregate, gravel, glass powder, an alumina silicate etc. can be used, for example, It is preferable that the content shall be 100 mass parts or less with respect to 100 mass parts of cement. Moreover, as an organic fiber, a polypropylene fiber, an acrylic fiber, a vinylon fiber etc. can be used, for example, and it is preferable to make the content into the range of 3-6 mass parts with respect to 100 mass parts of cement.

  The cement-containing inverse emulsion composition has the feature that the specific gravity of the cement-based molded article can be freely controlled by changing the water / cement mixing ratio. In the present invention, in the cement-containing inverse emulsion composition, the ratio of cement to water can be arbitrarily set, but the mass ratio is generally preferably in the range of 0.3 to 2 water with respect to cement 1.

An example of embodiment of this invention is shown, (a) thru | or (e) is the schematic of a process. An example of the lower mold | type same as the above is shown, (a) is a top view, (b) is sectional drawing, (c) is one part sectional drawing. An example of a conventional example is shown, and (a) to (d) are schematic views of steps. The other example of a prior art example is shown, (a) thru | or (e) is the schematic of a process.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Molding material 2 Receiving tray 3 Lower mold | type 4 Upper mold | type 5 Press molded product 6 Cushioning material 12 Crevice

Claims (3)

  After placing the molding material on the receiving tray, set the receiving tray on the lower mold together with the molding material, press the molding material between the lower mold and the upper mold, and then mold the molding material together with the receiving tray. A press-molding method, wherein the press-molded product is demolded.   The press molding method according to claim 1, wherein a buffer material for closing a gap with the receiving tray is provided around the lower mold.   The press molding method according to claim 1 or 2, wherein a cement-containing inverse emulsion composition containing cement, water, an oily substance and an emulsifier is used as the molding material.

Images