JPH072170Y2 - Press molding equipment - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to a press-molding apparatus for forming a molded product of a ceramic product such as a roof tile and other molded products.

[Prior art]

As one type of press molding apparatus, as shown in Japanese Utility Model Publication No. 56-23046, a guide having an upper mold facing a lower mold located on the bed of the machine stand and standing on the machine stand. A slider that is slidably mounted in the vertical direction and press-molds an object to be molded between the two dies, and a driving means that is supported above the slider by a supporting portion provided on the machine base. A ram that moves in the vertical direction and a pair of toggle link mechanisms that connect the ram, the support portion, and the slider to each other are provided. There is a press forming device that transmits to.

Thus, in this type of press-molding apparatus, each toggle link mechanism has a first link whose one end is rotatably connected to the ram, a second link whose one end is rotatably connected to the slider, and a triangular shape. A third link rotatably connected to the other end of the first link at the first corner, to the other end of the second link at the second corner, and rotatably to the support at the third corner. It is configured.

[Problems to be solved by the invention]

By the way, in the toggle link mechanism, when the ram moves in the vertical direction, the rings rotate in different directions and move up and down by different amounts in the vertical direction. Therefore, the toggle link mechanisms simultaneously move to the exactly same state. Is impossible,
The pressing force of each toggle link mechanism with respect to the slider is different. Therefore, the reaction force of each toggle link mechanism with respect to the ram is different, and the ram may be bent and deformed.

Therefore, an object of the present invention is to support the ram in an up-and-down direction so as to support the ram and prevent the ram from being deformed, thereby improving the durability of the press molding apparatus and the work efficiency of the press molding.

[Means for solving problems]

The present invention is characterized in that, in the press molding apparatus of the above-mentioned type, a guide portion into which the ram is slidably fitted is inserted in the slider.

[Function and effect of device]

According to this structure, the ram is always in a two-supported state, and even if the reaction force from each toggle link mechanism is different, the ram is not bent and deformed. Therefore, the durability of the press-molding apparatus is improved, and even if the press speed is increased to improve the work efficiency, the press-molding apparatus can endure it sufficiently.

〔Example〕

Hereinafter, the present invention will be described with reference to the drawings. FIGS. 1 and 2 show a press molding apparatus according to an embodiment of the present invention. The press molding apparatus is an apparatus for manufacturing a molded product of a roof tile before firing, and in this apparatus, four columns 13a to 13d are erected at four corners on the bed 12 of the machine base 11. A slider 14 is vertically slidably attached to an intermediate portion of each of the columns 13a to 13d so that each column 13a to 13d serves as a guide portion of the slider 14, and a column member 15 is attached to the upper end of each of the columns. Is fixedly assembled. An upper die 16a for roof tile forming is assembled on the lower surface of the slider 14, and the upper die 16a faces the lower die 16b assembled on the mounting base 17 supported on the bed 12 so as to be able to move forward and backward. The green body is pressed by the lower mold 16b to form a roof tile molding. The mounting base 17 has a pair of arms 18 at its rear end, as disclosed in Japanese Patent Application No. 62-129290 filed by the applicant.
It is rotatably connected to the rear part of the base 12 via a and 18b, and is also connected to the output shaft of the motor 18e via a crank lever 18c and a crank rod 18d. As a result, the mounting base 17 is tilted by the drive of the motor 18e as shown by the chain double-dashed line in FIG. A hydraulic cylinder 19 is fixedly attached to a substantially central portion of the support member 15, and a ram that is a piston rod of the hydraulic cylinder 19 extends so as to be able to move forward and backward in the vertical direction. Ram is the upper ram 19
It is a long one composed of a and a lower ram portion 19b, and both ram portions 19a and 19b sandwich an arm portion 19c and are screwed and connected to each other. The slider 14, the support member 15 and the ram (19
a, 19b) is a pair of left and right toggle link mechanisms 20a, 20b.
Are connected to each other at.

Both toggle link mechanisms 20a and 20b are composed of the same constituent members as shown in FIGS. 3 to 6, the first link 21 is a rectangular short one, and the second link 22 is a rectangular first link.
It is longer than 21, and the third link 23 is a substantially right-angled triangle. In each of these links, one end of the first link 21 is at the tip of the arm portion 19c of the ram, and one end of the second link 22 is at the center of each of the left and right sides of the slider 14.
The third corners of the third link 23 are rotatably connected to brackets 15a and 15b provided at the center of the left and right sides of the support member 15, respectively. The other end of the first link 21 is at the first corner of the third link 23, and the other end of the second link 22 is at the third corner.
Each of them is rotatably connected to the second corner of the link 23. In each toggle link mechanism 20a, 20b, the ram (19
a, 19b) is located at the top dead center, it is in the state shown in FIG.
Is rotated outward to gradually raise the second link 22. The slider 14 gradually slides downward as the second link 22 rises to fit the upper die 16a into the lower die 16b, and form a green body between the two dies 16a and 16b. FIG. 4 shows each toggle link mechanism 20a, 2 when the ram (19a, 19b) is located at the bottom dead center.
The state of 0b is shown, and each toggle link mechanism 20a, 20b
Reduces the amount of downward movement of the slider 14 gradually according to the amount of downward movement of the rams (19a, 19b), and the upper die 16a with respect to the green body on the lower die 16b.
Increase the pressing force of.

Therefore, in the press molding apparatus, the slider 14
A cylindrical body 14c is provided so as to project in the central portion of the. The inner hole 14d of the cylindrical body 14c faces the rams (19a, 19b), and the lower ram portion 19b is slidably fitted in the vertical direction. As a result, the lower ram portion 19b always slides in the inner hole 14d when moving in the vertical direction, and is guided to move in the vertical direction.

Thus, in the press molding apparatus, the ram (19
a, 19b) are always supported by the cylinder 19 and the slider 14 so that even if the reaction force of each toggle link mechanism with respect to the ram is different, the ram does not bend and deform. Absent. Therefore, the durability of the ram, that is, the press-molding apparatus is improved, and even if the press speed is increased to improve the working efficiency, it is sufficiently durable.

In the above embodiment, the slider 14 and the ram (19
a, 19b) are configured so that they reach the bottom dead center at the same time, and the reciprocating motions of these two are made to correspond to each other, but in the present invention, it was shown in the first Japanese Utility Model Publication No. 56-23046. As in the press molding device, the rams (19a, 19b) are configured to further descend after reaching the bottom dead center of the slider 14 to reach the bottom dead center, and by one reciprocating motion of the rams (19a, 19b). The slider 14 may be reciprocated twice.

[Brief description of drawings]

FIG. 1 is a side view of a press molding apparatus according to an embodiment of the present invention, FIG. 2 is a rear view of the apparatus, and FIGS. 3 and 4 are operation explanatory views of a toggle link mechanism in the apparatus, and FIG. 4 is a sectional view taken along line VV in FIG. 4, and FIG. 6 is a sectional view taken along line VI-VI in FIG. Explanation of symbols 11 …… Machine stand, 12 …… Bed, 13a to 13d …… Posts (guide), 14 …… Slider, 14c …… Cylinder (guide), 15
…… Supporting member, 16a …… Upper mold, 16b …… Lower mold, (19a, 19
b) ... Ram, 20a, 20b ... Toggle link mechanism, 21 ... First link, 22 ... Second link, 23 ... Third link.

Claims (1)

[Scope of utility model registration request] 1. An upper die facing a lower die located on a bed of a machine stand, and is vertically slidably assembled to a guide portion standing on the machine stand, and between the two dies. And a slider for press-molding an object to be molded, a ram that is supported by a support portion provided on the machine base above the slider and moves in the up-and-down direction by a drive unit, and these ram, support portion and slider
In a press forming apparatus that includes a pair of toggle link mechanisms for connecting users, the press force of the ram is boosted by the action of the toggle link mechanisms and is transmitted to the two molds, the ram moves vertically on the slider. A press forming apparatus, which is provided with a guide portion which is slidably fitted.