JPH0475802B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an apparatus for forming a grooved molded body, for example, for manufacturing a refractory shelf board having slots.

[Prior Art] For example, firing of ceramics such as ceramics and IC packages is generally carried out by loading the products to be fired on refractory shelf boards assembled on a trolley that is housed in a firing furnace. This shelf board is repeatedly heated and cooled as the trolley moves in and out of the kiln.
For example, as shown in FIG. 4, it is known that spalling resistance can be significantly improved by forming a slot S with a narrow width of about 1 mm.

By the way, this type of refractory shelf with slots is manufactured by compression molding base material particles such as silicon carbide together with auxiliary components into a predetermined flat plate shape and firing, but the molding process involves slots with minute widths. It is not easy because of the As shown in FIG. 6, conventional molding equipment has been provided in which a thin plate b for forming slots is fixed to a mold frame a. A predetermined amount of material powder is stored in a mold frame a, and an upper mold (not shown) is pressed down to enter the mold frame a, thereby compressing and molding the material powder.

[Problems to be Solved by the Invention] However, in the conventional molding apparatus described above, excessive force is applied to the thin plate for forming the slot during compression molding, which often breaks the thin plate for forming the slot, and the mold frame of the molded product is damaged. The mold releasability from a is poor, and as a result, the molded product is easily damaged and molding defects occur, and there are also problems in that the process is interrupted due to the destruction of the thin plate, and costs and man-hours increase.

[Means for Solving the Problems and Their Effects] The present invention provides a groove forming plate that slidably penetrates the lower mold and projects into the formwork, and the lower mold is provided at the lower part of the groove forming plate. A bolt is provided that passes vertically through a fixing base provided below, and an adjustment nut is screwed onto the bolt so that its position can be adjusted to lock the bolt against the fixing base in a state where it cannot be removed upwardly. A spring is provided between the groove-forming plate and the fixing base to bias the groove-forming plate upward, and the lower die is raised and the groove-forming plate is relatively displaced downward to move the groove within the formwork. The compression-molded grooved body is taken out from the mold, and the force acting on the groove-forming plate during compression molding is absorbed by a spring to prevent excessive force from acting on the groove-forming plate. In addition to preventing this, the groove-forming plate is extracted from the molded body when the molded body is released from the mold, thereby improving mold release properties.

[Embodiment] An embodiment of the present invention will be described below with reference to FIGS. 1 to 3. When manufacturing the refractory shelf board shown in FIG. 4, the forming apparatus according to this embodiment
It is used for molding a powder compact having grooves or slots s passing through the top and bottom.

1 is a frame, and 2 is a formwork fixed to the frame 1 via a pedestal 3. Inside the formwork 2 is a lower ram 4.
A lower mold 5 fixed to the upper end is inserted to form the bottom of the formwork 2, and as the lower ram 4 moves up and down, it moves to the lowered position shown by the solid line in Figure 1 and the lowered position shown by the two-dot chain line in the same figure. It can be displaced between the raised position and the raised position. On the other hand, 6
is an upper mold fixed to the lower end of the upper ram 7, which has the same dimensions as the lower mold 5 so that it can be inserted into the formwork 2; It descends from the position shown by and enters the formwork 2. 8 is a feeder, which advances onto the mold 2 when the upper mold 6 rises, supplies a predetermined amount of material powder into the mold 2, and returns to its original position while scraping off the material powder protruding from the mold 2. fall back. Now, a through groove 5a is formed in the lower mold 5 at a position corresponding to the slot s forming part of the molded body, and a groove forming plate 9 is formed here so that its upper end protrudes into the mold frame 2. It is placed through the. The lower end of the groove forming plate 9 is fixed to a support stand 10. Two bolts 11 are provided protruding from the lower surface of the support base 10, and these bolts loosely pass through a fixing base 12 provided on the frame 1 and protrude downward.
An adjustment nut 13 is screwed here. Also,
A spring 14 is fitted to the bolt 11 and is located between the support base 10 of the groove forming plate 9 and the fixing base 12, so that the groove forming plate 9 is constantly urged upward and the fixing base 12 is It is supported in the upper part so that it can move up and down. The adjustment nut 13 prevents the bolt 11 from coming off upward, and also allows the height position of the groove forming plate 9 to be adjusted by screwing it forward and backward. In this embodiment, the upper end of the groove forming plate 9 is set to be at the same height as the upper surface of the formwork 2.

Next, the operation of the above configuration will be explained. First, from the state shown in FIG. 1, a predetermined amount of material powder is fed into the form 2 by the feeder 8, and the feeder 8 is moved back. Next, when the upper mold 6 is lowered, its lower surface comes into contact with the upper end of the groove forming plate 9, and the spring 14
The upper mold 6 enters the mold frame 2 while compressing the groove forming plate 9 and lowering the groove forming plate 9. As a result, the material powder in the formwork 2 is compressed and molded into a flat plate with the groove forming plate 9 embedded therein. Thereafter, when the upper mold 6 is raised and the lower mold 5 is also raised together with it, the molded article a compression-molded within the mold 2 is extruded from the mold 2. When the lower mold 5 rises, the groove forming plate 9 embedded in the molded body a is also pulled upward, but the amount of upward movement of the groove forming plate 9 is regulated by the adjustment nut 13, and the upper end Part is formwork 2
Since the groove forming plate 9 does not rise above the upper surface of the molded body a, the groove forming plate 9 descends relative to the molded body a and is extracted straight downward from within the molded body a. This results in
The molded body a is ejected from the mold frame 2 without being distorted by the groove forming plate 9, and a slot s corresponding to the groove forming plate 9 is formed in the molded body a (see FIG. 3). Thereafter, by taking out the molded body a from the molding device and lowering the lower die 5, it returns to the initial state shown in FIG. can be continuously molded.

As described above, according to this embodiment, during compression molding,
Even if a large pressure force from the upper mold 6 acts on the groove forming plate 9, the force can be absorbed by the spring 14 to prevent excessive force from acting on the groove forming plate 9. Deformation, damage, etc. of the forming plate 9 can be prevented. After the material powder is compression-molded, the grooved molded body a is extruded from the mold frame 2 by the rise of the lower die 5, so that the molded body a can be released from the mold extremely easily, and productivity is greatly improved. . Moreover, as the molded body a rises as the lower die 5 rises, the groove forming plate 9 is pulled straight downward from the molded body a, so that the molded body a is not forcibly pried by the groove forming plate 9. Therefore, it is possible to prevent the molded product a from being damaged and to suppress the occurrence of molding defects.

In the above embodiment, the molded body a is formed with a groove s passing through it vertically, but the present invention is not limited to this. For example, a groove g with a bottom as shown in FIG. Of course, the present invention can also be applied to molding a molded article. In this case, adjust the screwing position of the adjustment nut 13 to the bolt 11 to set the height position of the upper end of the groove forming plate 9 to be slightly lower than the upper surface of the formwork 2. Good. In addition, the present invention is not limited to the embodiments described above and shown in the drawings.
For example, when the material powder is compressed by the upper mold 6 and the lower mold 5, both molds 5 and 6 are vibrated to improve the filling performance, and the present invention can be modified in various ways without departing from the gist of the invention. It is.

[Effects of the Invention] As described above, the present invention provides a groove-forming plate that slidably penetrates the lower mold on a fixed base via a spring, and a molded article compression-molded within the mold is fixed to the lower mold. Since the mold is removed from the mold by raising the mold and displacing the groove-forming plate relatively downward, the groove-forming plate is prevented from being destroyed, and the molded product can be easily released from the mold. The forming plate prevents the molded object from being twisted and prevents damage to the molded object, thereby improving productivity and preventing molding defects, as well as improving molding yield and reducing costs. It has excellent effects.

[Brief explanation of the drawing]

1 to 3 show an embodiment of the present invention,
Fig. 1 is a longitudinal sectional front view, Fig. 2 is a partially enlarged longitudinal sectional side view, Fig. 3 is a longitudinal sectional front view showing the molded body after it has been released from the mold, and Figs. 4 and 5 are made of different refractories. FIG. 6 is a perspective view showing a shelf board, and FIG. 6 is a perspective view showing a conventional molding device. In the drawing, 2 is a mold, 5 is a lower mold, 6 is an upper mold, 9 is a groove forming plate, 11 is a bolt, 12 is a fixing base, 13 is an adjustment nut, and 14 is a spring.

Claims (1)

[Claims] 1. A lower mold constituting the bottom of the mold and an upper mold inserted into the mold from above are provided in a vertically movable manner, and the mold is supplied into the mold between the lower mold and the upper mold. The shelf board made of refractory is formed by compressing a material, and includes a fixed base provided below the lower mold, and a fixed base provided below the lower mold, which extends slidably through the lower mold and protrudes into the mold frame. a groove-forming plate provided at the bottom of the groove-forming plate and passing through the fixing base vertically; and a bolt that is screwed onto the bolt so that its position can be adjusted to prevent the bolt from being pulled out upward relative to the fixing base. an adjustment nut that locks the groove forming plate in the fixed position; and a spring that is provided between the groove forming plate and the fixing base and biasing the groove forming plate upward; 1. A molding apparatus for a grooved molded article, characterized in that the grooved molded article compression-molded within the mold is taken out from the mold by relatively being displaced downward.