JP2014188771A - Suspension insulator molding die - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a suspension insulator molding die which can allow a repair cost, when a molding plane thereof is worn, to be reduced and a release pitch to be made shorter than that at present without deteriorating molding quality.SOLUTION: An air-permeable structural member 12 is disposed on the inside of a metallic die frame 10 so as to cover the molding plane except a cap tip part and a head top part of the suspension insulator so that a cavity part 13, to which releasing air is supplied, is formed between the air-permeable structural member 12 and the metallic die frame 10. A porous surface layer 14 is formed on the surface of the air-permeable structural member 12 so that porosity of the cap tip part 17 and that of the head top part 18 are made smaller than those of other portions and the surface of the porous surface layer is used as the molding plane 15. It is preferable that the porous surface layer 14 comprises a porous material having no pores of 50 μm or larger and the air-permeable structural member 12 comprises another porous material having the air permeability (JIS R2115) equal to or higher than 10(m).

Description

  The present invention relates to an improvement of a hanging insulator mold used for press forming a hanging insulator.

  Suspended insulators are manufactured through a process of kneading clay containing feldspar, porcelain stone, clay, and the like as a main component, extruding from a kneader, press-molding into a predetermined shape, drying, glazing and firing.

  As shown in FIG. 1, a metal mold 1 is filled with air-permeable gypsum 2 and the surface of the gas-permeable gypsum 2 is formed on the molding surface. 3 (Patent Document 1) is used. Also, as shown in Patent Document 1, a release air supply path 4 is formed inside the mold, air blow is performed after press molding, the molded body is floated from the molding surface 3, and is taken out from the suspension insulator mold. There is also known a structure that facilitates the above.

  However, such a conventional hanging insulator mold is difficult to position because an unstable porous tube is embedded in breathable gypsum, and the distance from the mold surface to the porous tube varies, resulting in non-uniform ventilation. As a result, the product may be deformed. In addition, due to the large variation, it is difficult to reduce the distance from the mold surface to the perforated tube, so it is not possible to increase the air blow by thinning the breathable gypsum, increasing the mold release speed and increasing the production pitch. It was difficult to give.

  Further, such a conventional hanging insulator mold is used when the molding surface 3 of the air-permeable gypsum 2 as a molding material is worn by repeated use, and a molded article having a predetermined dimension cannot be molded. It was necessary to remove all the air-permeable gypsum 2 from 1 and to newly manufacture a hanging insulator mold, and there was a problem that many man-hours and material costs were required.

  The breathable gypsum 2 constituting the molding surface 3 is dense in order to achieve the purpose of obtaining a smooth molding surface, being hard to clog, and obtaining mechanical strength that can withstand the molding load. There is a need. However, on the other hand, if the air-permeable gypsum 2 is made dense, air permeability is inevitably lowered, so that it is difficult to perform air blowing, and mold release properties after molding are lowered. For this reason, it is difficult to shorten the release pitch as compared with the current situation, and this has been a bottleneck in improving productivity.

JP-A-7-178713

  Accordingly, the object of the present invention is to solve the above-described conventional problems, reduce the repair cost when the molding surface is worn, and shorten the mold release pitch from the current level without deteriorating the molding quality. It is to provide a hanging insulator mold that can be used.

  The suspended insulator mold of the present invention made to solve the above problems is a suspended insulator mold in which a breathable structural member and a porous surface layer constituting a molding surface are arranged inside a metal mold. A ring-shaped support portion is disposed between at least both end portions of the air-permeable structural member and the mold, and a cavity surrounded by the air-permeable structural member, the mold, and the support portion is formed. In addition, the air-permeable structural member supports a molding surface excluding the cap tip and the top of the pendulum insulator, and the porosity of the cap top and the top of the porous surface layer is determined by: It is characterized by being smaller than the other parts.

As in claim 2, it is preferable that the thickness of the porous surface layer of the shade forming part excluding the tip of the shade is thinner than the other parts. As in claim 3, the porous surface layer is preferably made of a porous material having no pores of 50 μm or more. Moreover, it is preferable that the air-permeable structural member is made of a porous material having an air permeability (JIS R2115) of 10 ⁻¹³ (m ² ) or more. Further, as in claim 5, it is preferable to provide an air tube for introducing release air from the outside of the mold to the cavity.

  Since the suspended insulator mold according to the present invention has a structure in which a porous surface layer is formed on the surface of a gas-permeable structural member, variation in the thickness of the porous surface layer can be reduced. As a result, it is possible to eliminate variations in product release timing due to air blow and eliminate deformation of the product, and the porous surface layer can be made thinner, so the air blow amount is increased and the release pitch is made faster than before. Can do.

  Moreover, since the suspended insulator mold of the present invention has a structure in which a porous surface layer is formed on the upper side of the air-permeable structural member, when the molding surface is worn by repeated use, the surface of the air-permeable structural member It may be repaired by removing only the porous surface layer. For this reason, as compared with the conventional suspended insulator mold as shown in FIG. 1, the amount of mold material such as air-permeable gypsum and porous resin constituting the molding surface can be greatly reduced. , Repair costs can be reduced. Moreover, since the conventional formwork can be used as it is, the manufacturing cost can be reduced.

  In the hanging insulator mold of the present invention, since the thickness of the cap portion molding portion of the porous surface layer of the cap portion molding portion excluding the cap portion tip portion is made thinner than other portions, the cap portion tip portion is excluded. The amount of air blow in the cap forming part can be selectively increased, and the release pitch can be increased more effectively. Moreover, since the thickness of the porous surface layer of the head is thicker than that of the cap portion molding portion, it is possible to prevent the deformation of the head due to the mold release air, and to reduce the mold release pitch without deteriorating the molding quality. It can be shortened compared to the present situation.

It is sectional drawing which shows the conventional hanging insulator shaping | molding die. It is sectional drawing which shows the hanging insulator shaping | molding die of embodiment of this invention.

Hereinafter, preferred embodiments of the present invention will be described.
FIG. 2 is a cross-sectional view showing a suspended insulator mold according to an embodiment of the present invention. A metal mold 10 is made of an aluminum alloy in the present embodiment as in the conventional case, but other metals may be used. A ring-shaped support portion 11 is provided inside the mold 10. The support part 11 may be molded integrally with the mold 10 or may be separately molded and attached to the mold 10. The arrangement of the support part 11 will be described later. As the mold 10, the conventional one shown in FIG. 1 can be used.

Reference numeral 12 denotes a breathable structural member disposed inside the mold 10. The air-permeable structural member 12 is disposed so as to cover the molding surface excluding the cap end portion 17 and the crown portion 18 of the suspended insulator. The material of the air-permeable structural member 12 is required to have a mechanical strength similar to that of gypsum and to have high air permeability. In the present invention, the material is made of a porous metal or a porous resin. The air-permeable structural member 12 is preferably a porous material having an air permeability (JIS R2115) of 10 ⁻¹³ (m ² ) or more. If the air permeability of the air permeable structural member 12 is smaller than this, the air permeability is insufficient, which is not preferable.

  As the porous resin suitable for the air-permeable structural member 12, a phenol resin porous material can be used. In this case, a phenol resin porous material block is purchased and the external shape is cut out according to the shape of the mold 10, and the internal shape is cut out according to the shape of the suspension insulator to be molded. What is necessary is just to fix with fixing tools, such as a key. In addition to the fixture, an appropriate positioning member can be used to attach the air-permeable structural member 12.

  A ring-shaped support portion 11 is disposed between both ends of the air-permeable structural member 12 and the mold 10 to form a cavity 13 surrounded by the air-permeable structural member 12, the mold 10 and the support 11. To do. In this embodiment, ring-shaped support portions 11a, 11b, and 11c are disposed at the upper end, the center portion, and the lower end portion of the breathable structural member 12, respectively. In this way, the cavity 13 surrounded by the air-permeable structural member 12, the mold 10, and the support 11 is formed. Note that a vent hole is formed in the support portion 11b, and the upper and lower cavities 13, 13 communicate with each other. The hollow portion 13 is a portion to which release air is supplied after press molding. Further, the lower surface of the breathable structural member 12 is supported by a support portion 11 formed inside the mold 10. Accordingly, it is possible to prevent the breathable structural member 12 from being bent due to the press molding pressure.

  After the air-permeable structural member 12 is set inside the mold 10 in this manner, the porous surface layer 14 is formed on the surface thereof, and the surface is used as a hanging insulator molding surface 15. The porous surface layer 14 is made of breathable gypsum or porous resin. If the shape of the inner surface of the breathable structural member 12 is close to the molding surface 15 as shown in the figure, the porous surface layer 14 is changed to 2 to 2. It can be as thin as about 50 mm. In the present invention, the thickness of the porous surface layer 14 in the cap portion molding portion is made thinner than other portions. Further, the porosity of the porous surface layer of the cap portion tip portion 17 and the top portion 18 is made smaller than that of the other portions.

  The porous surface layer 14 is preferably made of a porous material having no pores of 50 μm or more. If there are pores of 50 μm or more, the molding surface becomes rough and the clay, which is the molding material, is easily clogged. When breathable gypsum similar to the conventional one is used as the porous surface layer 14, the gypsum is poured into the surface of the breathable structural member 12 set inside the mold 10 to make it semi-cured, and then the cavity Air pressure is applied to the portion 13. As a result, the air pressure that has passed through the air-permeable structural member 12 acts on the gypsum to extrude the water in the gypsum, thereby forming a gas-permeable gypsum.

  In addition, an air tube 16 is provided in the cavity 13 outside the head to eject release air toward the shade forming part. By releasing the release air from the tip of the air tube 16 toward the cap portion forming portion, the release air is mainly supplied to the cap portion forming portion, and the porous surface layer 14 of the cap portion forming portion. Combined with the reduced thickness, the cap portion of the press-suspended suspension insulator can be lifted and released. Note that the release air is not supplied to the head so much, so it is possible to prevent the head from being deformed by the release air, and to reduce the release pitch from the current level without deteriorating the molding quality. Can do.

  The suspension insulator mold of the present invention configured as described above is used for forming a suspension insulator by press-molding a clay as in the prior art. Since the molding surface 15 is constituted by the dense porous surface layer 14, the surface of the molded product is smooth, and the clay does not clog the molding surface 15. Further, since the porous surface layer 14 is supported by the breathable structural member 12 having mechanical strength, there is no possibility of distortion due to the molding pressure.

  When taking out the molded product from the hanging insulator mold, pressurized air is introduced into the cavity 13 of the mold 10 through the air tube 16. The pressurized air passes through the air-permeable structural member 12 to reach the porous surface layer 14 and is ejected from the fine pores of the porous surface layer 14 to the molding surface 15. As described above, since the porous surface layer 14 is thin, the air permeability is excellent despite the small pore diameter. Thereby, an air layer is formed between the molding surface 15 and the molded body, and the molded body can be easily taken out. For this reason, if the hanging insulator mold of the present invention is used, the mold release pitch can be shortened from the current level, and the productivity can be improved.

  As a result of repeated use, when the porous surface layer 14 is worn, only the porous surface layer 14 may be removed from the breathable structural member 12 and repaired. For this reason, the material required at the time of repair is greatly reduced compared to the conventional case, and the repair cost can be reduced.

  As described above, the suspended insulator mold according to the present invention can reduce the repair cost when the molding surface is worn, and can reduce the mold release pitch without reducing the molding quality. It has special effects such as what it can do.

DESCRIPTION OF SYMBOLS 1 Formwork 2 Breathable gypsum 3 Molding surface 4 Supply path of mold release air 5 Shade part 6 Head 10 Mold 11 Support part 12 Breathable structural member 13 Cavity part 14 Porous surface layer 15 Molding surface 16 Air tube 17 The cape tip 18 The top of the head

Claims (5)

A hanging insulator mold in which a breathable structural member and a porous surface layer constituting a molding surface are arranged inside a metal mold,
A ring-shaped support portion is disposed between at least both end portions of the breathable structural member and the mold, and a cavity surrounded by the breathable structural member, the mold, and the support portion is formed.
The air-permeable structural member supports the molding surface excluding the tip portion and the top portion of the shade portion of the suspension insulator, and the porosity of the top portion and the top portion of the shade portion of the porous surface layer is set to other portions. A hanging insulator mold characterized by being made smaller.   The suspended insulator mold according to claim 1, wherein the thickness of the porous surface layer of the cap portion molding portion excluding the cap portion tip portion is thinner than the other portions.   The suspended insulator mold according to claim 1 or 2, wherein the porous surface layer is made of a porous material having no pores of 50 µm or more. 4. The suspended insulator molding according to claim 1, wherein the breathable structural member is made of a porous material having an air permeability (JIS R2115) of 10 ⁻¹³ (m ² ) or more. Type.   The hanging insulator mold according to any one of claims 1 to 4, further comprising an air tube for introducing release air from the outside of the mold to the cavity.