JPH03118107A - Rotary trowel forming method for ceramic ware product - Google Patents

Abstract

PURPOSE:To form relief pattern on the side being in contact with a rotary trowel surface of a ceramic ware product by using the rotary trowel with a relief section on the trowel surface, allowing the number of rotations of a rotary potter's wheel shaft to coincide with a trowel rotary shaft for forming a product. CONSTITUTION:In the case of a dish-shaped product with projected relief sections on the rear side surface, a product with recessed relief sections corresponding to projected relief sections 10 engraved on said rotary outer trowel surface is manufactured and set on a rotary outer trowel wheel forming machine. Then, the number of rotations of a rotary potter's wheel shaft 2 and a trowel rotary shaft 6 are conformed with and molded, and the recessed relief sections engraved on a rotary outer trowel surface 5 are formed in the form of the projected relief sections 10 on the rear side surface 9 of a dish. In the case the recessed relief sections 10 as the design on an inner side surface 11 is formed, the corresponding recessed relief sections are engraved on the rotary inner trowel surface, set in the rotary inner trowel wheel molding machine and molded similarly as above-said. The number of rotations is different according to the size and shape of a molded product, and can be selected properly in the range of 300-420rpm, and in case of inner trowel method, the same can be selected in the range of 550-600rpm.

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to a rotary trowel molding method for ceramics, in particular,
The present invention relates to a rotary trowel potter's wheel molding method for ceramic products having a relief portion on the side in contact with the trowel surface of the rotary trowel.

[Prior Art] Conventionally, single-rotation potter's wheel molding machines have been most widely used for molding ceramic products such as plates, cups, and pottery that require mass production. Depending on the shape of the molded product, this rotary potter's wheel molding machine uses plaster molds that are convex, like a plate, or concave, like a cup or Fukabayashi. There are two types of methods: the former is called the external trowel method, and the latter is called the internal trowel method.

FIG. 5 is a schematic diagram showing an external rotating trowel potter's wheel molding machine, and FIG. 6 is a schematic diagram showing an internal rotating trowel potter's wheel molding machine. In the figure, reference numeral 1 denotes a plaster mold forming one surface of the molded product, which is placed on a chapel 3 provided above a rotating potter's wheel shaft 2, and is rotated by the rotating potter's wheel shaft 2. 4 is aluminum having a trowel surface 5 forming another surface of the molded product;
It is a rotary iron made from a material such as iron, and is usually heated (about 100°C) with an electric heater built inside.

Further, the rotary iron 4 is supported by a bearing 7 of the iron rotating shaft 6,
It is rotated by the iron rotating shaft 6 in the same direction as the rotating potter's wheel shaft 2. The rotational speeds of the rotary potter's wheel shaft 2 and the rotating iron 1116 are within the range shown in Table 1, and the size of the molded product,
An appropriate rotation speed is selected depending on the shape. 8 is molded clay.

Table 1 To explain the molding method using this molding machine, first, a plaster mold 1 is placed on a church 3, and a flat plate-shaped or dumpling-shaped molding clay 8 is placed on top of it. Next, the molding clay 8 is pressed while rotating the rotary potter's wheel shaft 2 and simultaneously rotating the heated rotary trowel 4. Then, the molding clay 8 is rolled while forming a film of water vapor between the molding surface 5 and the molding rod 8, and a molded product having a predetermined thickness is obtained along the molding surface 5.

[Problems to be Solved by the Invention] In recent years, as demands for more diverse designs and higher quality ceramic products have become stronger, relief patterns have been increasingly applied to the surfaces of products. However, at present, as described in Table 1, due to the difference in rotation between the rotary potter's wheel shaft and the trowel rotary shaft, there is a rotation difference between the plaster mold that interlocks with the rotary potter's wheel shaft and the rotary trowel that interlocks with the trowel rotary shaft. Because of this, it was impossible to create a relief pattern on the trowel surface of the molded clay that was in close contact with the plaster mold. Therefore, we are trying to realize this by processing a relief pattern exclusively on the surface of the plaster mold and transferring the relief pattern to a specially molded clay.

As a result, the places where the relief of the product can be applied are limited to the front side of the plate and the cup that are in contact with the plaster mold surface, and the outer surface of the deep forest, whereas in the external trowel method, the areas where relief can be applied are limited to the back side of the plate that is in contact with the trowel surface, the high ground, etc.
The problem with the inner trowel method was that relief was not applied to the inner surface of the cup or shinrin.

Therefore, the present invention is a method proposed to solve this problem, and its object is to apply a relief pattern to the side of a ceramic product that is in contact with the rotary trowel surface.

[Means for Solving the Problems] In order to achieve this object, the present invention provides a rotary trowel potter's wheel molding method for ceramic products, in which a rotating trowel shaft and a trowel rotating shaft are connected by a rotary trowel having a relief portion on the trowel surface. This is a rotary trowel potter's wheel molding method for ceramic products, which is characterized in that potter's wheel molding is performed by matching the number of rotations of the molded products, and a relief portion is formed on the side of the molded product that is in contact with the trowel surface.

[Function] The trowel surface of the 0-rotation trowel described in detail of the present invention has a smooth surface because it is conventionally manufactured by lathe processing.

Therefore, when providing an uneven relief part on the trowel face, the concave relief part is carved by engraving the concave part on the trowel face.
The convex relief portion can be easily formed by adding the convex portion to the trowel surface by a processing method such as electric welding.

Further, in the present invention, since the rotational speeds of the rotating potter's wheel shaft and the trowel rotating shaft are made to match, the uneven relief portion provided on the trowel surface presses against the same location each time during molding.

Therefore, the relief portion can be expressed in the molded product according to its shape.

The above-mentioned rotation speeds vary depending on the size and shape of the molded product in the external trowel method, but are appropriately selected within the range of 300 to 420 rpm, and within the range of 550 to 600 rpm in the internal trowel method.

[Example] Next, an example of the present invention will be described with reference to the drawings.

[Example 1] Fig. 1 is a front view including a half sectional view of a plate molded product having a convex relief portion formed on the back side, showing a first example of the present invention. First, since a rotary external trowel is used in the case of plate molded products, a concave relief part corresponding to the designed convex relief part 10 on the back surface 9 of the plate is engraved on the surface of the rotary trowel. , and set it on an external rotary trowel molding machine as shown in FIG.

Next, the raw material composition was 28 parts by weight of β-birophosphate lime, 6 parts by weight of limestone, 5 parts by weight of sericite, 25 parts by weight of kaolin,
A bone china base and a mixture consisting of 15 parts by weight of frog's eye clay, 20 parts by weight of feldspar and 1 part by weight of silica are crushed, mixed, dehydrated and vacuum kneaded in a conventional manner to obtain a clay for molding. The clay has a moisture content of 23%, a penetration hardness of 11 to 13 by the penetration method, and is processed into a flat plate depending on the shape of the molded product.

Next, the clay is molded by the rotary trowel potter's wheel molding method described above using the rotary outer trowel. At that time, the rotating potter's wheel axis 2
When the rotational speed of the trowel rotating shaft 6 is set to 320 rpm, the concave relief portion on the rotatable trowel surface 5 is expressed as a convex relief portion 10 on the back surface 9 of the plate, as shown in Fig. 1. The molded product is molded. After that, dry and finish, about 125
By firing at 0°C, applying a frit glaze and firing at 1150°C, a bone china product with a beautiful relief design on the back side of the plate can be obtained.

[Example 2] FIG. 2 is a front view including a half sectional view of a cup molded product having a convex relief portion formed on the inner surface, showing a second example of the present invention. First, in the case of a cup molded product, since a rotating inner trowel is used, a concave relief part corresponding to the convex relief part 10 designed on the inner surface 11 of the cup shown in FIG. 2 is engraved on the rotary trowel surface. The molded product is manufactured and set in a rotary iron potter's wheel molding machine as shown in Fig. 6.

Next, the same bone china base material as in Example 1 was used for the raw material composition and manufacturing process of the molded clay, and the moisture content of the clay was 24% due to the internal troweling, and the penetration hardness by the penetration method was 12 to 14. The resulting material is processed into dumplings depending on the shape of the molded product.

Next, the clay is molded using the rotary trowel using the rotary trowel potter's wheel molding method described above. At that time, if the rotation speeds of the rotary potter's wheel shaft 2 and the trowel rotating shaft 6 are made to match 400 rpm, the concave relief part on the rotary trowel surface 5 becomes a convex relief part 10 on the inner surface 11 of the cup. When the handle is attached, a molded product as shown in Fig. 2 is obtained. After that, it is dried, finished, fired at about 1250°C, frit glazed and fired at 1150°C to obtain a bone china product with a beautiful relief design on the inner surface of the cup.

[Embodiment 3] FIGS. 3 and 4 are a front sectional view and a bottom view of a dish in which a concave relief portion is formed in the elevated portion, showing a third embodiment of the present invention. First, since an external rotary iron is used for forming the dish, as shown in FIGS. The plate-forming portion of the rotary outer trowel is electrically welded and set in a rotary outer trowel molding machine as shown in FIG. 5.

Next, a porcelain base mixture consisting of 20 parts by weight of alumina, 35 parts by weight of chinastone, 20 parts by weight of kaolin, 10 parts by weight of frog's eye clay, and 15 parts by weight of feldspar was crushed, mixed, and dehydrated using a conventional method. The clay for molding is kneaded in a vacuum, the moisture content of the clay is 22%, and the penetration hardness by the penetration method is 11 to 13. The clay is processed into a flat plate according to the shape of the molded product.

Next, the clay is molded by the rotary trowel potter's wheel molding method described above using the rotary trowel. At this time, when the rotational speeds of the rotating potter's wheel shaft 2 and the trowel rotating shaft 6 are made to match 350 rpm, the convex relief portion formed on the rotatable trowel surface becomes a concave relief portion 13 on the elevated portion 12 of the pan. expressed, third
A molded article as shown in Figs. and 4 is molded. after that,
After drying, finishing and bisque firing, a feldspathic glaze is applied.
When fired at 10°C, a porcelain product with a relief part on the elevated part of the plate is obtained. This relief part is effective in draining water that tends to remain at the bottom when washing dishes.

The products of Examples 1 and 2 have a convex relief part formed on the side surface, but it goes without saying that if the processing on the iron is changed to a convex relief part, a concave relief part can be formed on the product. do not have. Further, it is also possible to form a concave and convex relief part in the product by mixing concave relief parts and convex relief parts when processing the iron.

[Effects of the Invention] As described above, according to the present invention, in a rotary potter's wheel molding method using a conventional rotary potter's wheel molding machine, a rotary trowel having an uneven relief part on the trowel surface can be used to connect the rotary potter's wheel shaft. By matching the number of revolutions of the trowel rotating shaft and performing potter's wheel molding, it is now possible to create relief parts on the back and elevated parts of the plate that contact the trowel surface, as well as on the inner surfaces of cups, deep woods, etc., which was previously possible. It has become possible. Therefore, it is possible to meet the demands for diversification, sophistication, etc., and is an extremely effective invention in practice.

[Brief explanation of drawings]

FIG. 1 is a front view including a half cross-sectional view of a dish molded product having a convex relief portion formed on the back side, showing a first embodiment of the present invention;
FIG. 2 is a front view including a half sectional view of a molded cup having a convex relief portion formed on the inner surface, showing a second embodiment of the present invention, and FIGS. 3 and 4 show a third embodiment of the present invention. FIG. 5 is a front sectional view and a bottom view of a plate having a concave relief portion formed on an elevated portion, and FIG. 5 is a schematic diagram showing a conventional external rotary iron potter's wheel molding machine. FIG. 6 is a schematic diagram showing a conventional rotary trowel molding machine. 1... Gypsum mold, 2... Rotating potter's wheel axis, 3... Cathedral, 4... Rotating trowel, 5... Trowel face, 6... Trowel rotation axis,
7... Bearing, 8... Molded clay, 9... Back side of plate, 10... Convex relief part, 11... Inner side of cup, 12... Elevated part of plate, 13...Concave relief part.

Claims (1)

[Claims] (1) In the rotary trowel potter's wheel molding method for ceramic products, potter's wheel molding is performed using a rotary trowel with a relief part on the trowel surface by matching the rotation speeds of the rotary potter's wheel shaft and the trowel rotating shaft, and the molded product is formed on the trowel surface. A rotary trowel potter's wheel molding method for ceramic products, which is characterized by forming a relief part on the contacting sides.