DE69018060T2 - Horizontal split molding machine of the type stationary core box. - Google Patents

Description

This invention relates to a horizontally split molding machine according to the preamble of claim 1. The invention is applicable to various types of molding processes, such as warm box, hot box, cold box (isocure, SO₂, CO₂, methyl formate, etc.), as well as to the shell molding process.

State of the art:

The horizontally split molding machines mentioned above are largely divided into two systems, a conventional core box lifting system and a core box carriage traversing system in which a molding operation is carried out by mounting a core box upper on a core box lower.

As the core-box lifting molding machines, those disclosed in Japanese Patent Publications Nos. 22212/70 and 13255/83 and Utility Model Publications Nos. 1875/85, 1876/85 and 19790/85, which were filed in the name of the applicant of this application, are known.

US-A-4 700 767 discloses a molding machine for molding sand cores using openable punches and a blowing head, with a compressed air tank, closure devices for supplying air, movable supports for the head to move the latter both horizontally and vertically, a lifting piston, a gas filling plate, a dowel/pin plate and an openable clamping sleeve. This molding machine does not allow to solve the problems of the present invention set out below.

Objects to be solved by the invention:

As mentioned above, the conventional horizontal split molding machines are of the system in which the core box is either lifted or shifted, and no horizontal split molding machine in which a molding operation is carried out with a stationary core box has been proposed so far.

However, the core box of a horizontal split molding machine is usually the heaviest of the machine equipment elements and it requires a lot of energy to move such a heavy core box device. This increases the running costs and it is now necessary to mitigate the shock when a heavy object is stopped as the machine cycles increase. Furthermore, the core boxes are now becoming larger and an operation/stand is required to inspect and clean the inside of the core boxes, which causes various problems.

Means to solve the problems:

The inventor of this invention has carried out a considerable amount of research and experimentation in an attempt to eliminate the various disadvantages of the known horizontally split molding machines referred to above, and has thus succeeded in developing the horizontally split molding machine of the present invention. The technical structure of the invention relates to a horizontally split tool molding machine in which a core box comprises a pair of an upper core box and a lower core box, blowing, mold ejecting and gas filling devices being arranged laterally movably in the upper position of the upper core box, characterized in that the The core box device is provided with a device for tilting the core box by 90º, and is further equipped with a device in which the gas filling device and the blowing device are detachably connected to one another via a connecting device.

The invention will now be explained by means of an embodiment with reference to the accompanying drawings. By the system of a stationary core box device is meant that the core box device does not raise, lower and move sideways, except when the core box is replaced.

The accompanying drawings are detailed drawings showing an example of a molding machine according to the invention, as well as schematic drawings of the respective positional relationships between the main components shown during an operation.

Fig. 1 is a front view of a molding machine according to the invention;

Fig. 2 is a side view of the machine of Fig. 1; and

Fig. 3-14 are detailed and schematic views showing the operation of the molding machine.

In the drawings, reference numeral 1 designates a core lower box and reference numeral 2 designates a core upper box. The core lower box 1 is detachably attached by a known clamping device to the lower end of a guide rod which is operated by a lifting cylinder 3 arranged on the upper frame of the machine frame. is driven. Reference numerals 4 and 5 respectively denote a blow head carriage and a gas filling carriage. The carriages 4 and 5 are arranged to move laterally on a rail 7 shown in Fig. 2 and suspended from the lower side of the upper frame 18 by actuation of a transverse cylinder 11. The blow head carriage 4 and the gas filling carriage 5 are detachably connected to one another on their mutually facing sides by a coupling device such as a connecting bolt 6 shown in Fig. 1, wherein the connecting bolt 6 is released from the blow head carriage 5 and only the gas filling device 5 moves upwards when the core lower box 1 moves upwards (together with the gas filling carriage).

Fig. 1 and 2 shows the following main components in addition to those mentioned above:

Reference numeral 8 is a sand supply assembly provided between a hopper 19 and the blowhead carriage 4. Reference numeral 9 is a blowing head, reference numeral 10 is a gas filling head, reference numeral 12 is a known pressure cylinder provided on a connecting frame 33 of the lifting guide rod, reference numeral 13 is a pressure head of the pressure cylinder 12, reference numeral 14 is a blowing air tank, reference numeral 15 is an ejector cylinder for the upper core box, reference numeral 16 is a cylinder for tilting the lower core box by 90º, reference numeral 17 is a cleaning device for the lower core box, reference numeral 20 is a blowing plate, reference numeral 21 is a blowing plate clamping cylinder, reference numeral 22 is a cylinder for fastening the upper core box, reference numeral 23 is a cleaning device for the blowing plate, reference numeral 24 is a lower core box clamping cylinder, reference numeral 25 is a cylinder which is used for adjusting a core box transport rail 29 when exchanging a core box, reference numeral 26 is a dust tank, Reference numeral 27 is a frame of the molding machine or reference numeral 28 is a lower box ejector cylinder for actuating the ejector device for molded parts (such as cores).

An embodiment of the horizontally divided molding machine according to the invention, which is technically constructed as described above, is explained below with reference to Figs. 3 to 14.

In addition, the schematic views Fig. 5 to 14 show schematically and partly in section the respective positional relationships of the work sequence during a molding process using the upper core box, the lower core box, the blow head, the gas filling head, etc.

Fig. 3 and 5 are front views of the molding machine when the molding process starts. The core box 1 descends to the state shown in Fig. 3 and 5 by moving downwards with the help of the lifting cylinder 3 and thereby being test-clamped onto the core box 2. The gas filling carriage 5 also descends with the core box 1, and at the same time is connected to the blow head carriage 4 by the connecting bolt 6 provided on the gas filling carriage 5 at the time when the respective wheels of the gas filling carriage are pressed against the rail 7 as shown in Fig. 2 and 6. These are the clamping steps of the core box 1 shown in Fig. 1.

The blow head carriage 4, which is supplied with sand from the hopper 19 by means of the sand feed assembly 8, is transported to the core head box by actuating the transverse cylinder 11. At this time, the gas filling carriage 5 attached to it is pushed into a waiting position. These are the traversing steps of the blow head shown in Fig. 1 and 7.

By actuating the pressure cylinder 12, the print head 13 presses the blow head 9 and thus the blow plate 20 of the blow head against the top of the core upper box 1. Then a blow valve (not shown) provided on the upper frame 18 is activated, the compressed air in the blow tank 14 is blown under pressure through the pressure head 13 into the blow head 9 and the molding sand in the blow head 9 is blown into the mold cavities in the core boxes. Then the air in the blow head is released and then the pressure of the blow head 9 is released. These are the pressing and blowing steps from Fig. 4 and 8.

By operating the transverse cylinder 11, the blow head carriage 4 is moved and returned to the sand feed position, while the gas filling carriage 5 connected to it via the connecting bolt 6 is transported to the upper section of the core upper box of the clamped core box filled with molding sand and stopped there. These are the traversing steps of the gas filling carriage from Fig. 9.

By operating the pressure cylinder 12, the pressure head 13 presses the gas filling head 10 against the upper surface of the core box 1, whereby a hardening gas is blown under pressure into the molding sand filled in the clamped core box by a conventional method to enable hardening of the molding sand. These are the gas filling and hardening steps of Fig. 10. In these steps, the ejector pin 15 is inserted into the blowing hole to level the surface of the blown sand.

While the upper core box 1 is raised by operating the lifting cylinder 3, the core ejector cylinder 28 of the lower core box 2 is simultaneously operated to eject the molded part 30 from the lower core box 2, whereby the upper core box 1 is separated from the lower core box 2 while it carries the molded part 30 and moves up in this position. At this time, the gas filling carriage 5 also moves up. These are the startup steps of the core box and the gas filling carriage in Fig. 11.

A core receiving unloading device 31 is inserted under the core upper box 1, the molded part 30 carried by the core upper box being released by actuating the ejector cylinder 15 provided in the gas filling carriage 5, and the molded part 30 is received by the unloading device 31 for removal. These removal steps of the molded part are shown in Fig. 12.

By operating the cylinder 16, the lower core box 2 is tilted by 90º (Fig. 13) and the cleaning device 17 of the lower core box is operated to clean the lower core box and spray a mold release agent or the like. These steps relating to tilting the lower core box by 90º, cleaning it and spraying a mold release agent are shown in Fig. 14. The upper core box 1 is cleaned by the cleaning device provided in the unloading device when the unloading device has been retracted.

The core box 2 is moved back by operating the cylinder 16 and is adjusted for the following forming cycle. This is the return step of the core box.

Although the functional example has been explained for the case where the molded part (core) is held in the core box, it is easy for those skilled in the art to understand that it is also possible to eject and remove the molded part while it remains in the core box.

An example of the molding process according to the invention has been explained above with reference to a wet sand process, but in the shell molding process almost the same workflow is carried out except for the absence of the gas filling step. becomes.

Effects of the invention:

(1) Since the core box device, which is often large in size, i.e. heavy in weight, is made stationary, the power/energy required to drive the heavy object is no longer required. This means that a reduction in running costs can be explored.

(2) If it is desired to increase the machine cycle of the molding process, it is currently unnecessary to provide any shock relief means when the machine stops due to the operation of a heavy object.

(3) Since the core box is stationary, even a very large core box can be inspected, cleaned, etc. from the height of the baseline/floor without the need for a work platform.

(4) Since the core box has a 90º tilting system, it is easy to remove the sand left in the core box and it is possible to avoid scattering the excess sand in the molding machine. Furthermore, it is easy to check and clean the core box by tilting it to a low position.

Claims (2)

1. Horizontally divided molding machine, which is equipped with a pair of horizontally divided upper core box (1) and lower core box (2), and in which blowing, ejecting and gas filling devices (4, 5) are arranged so as to be laterally pivotable above the upper core box (1), characterized in that the lower core box (2) is designed to be stationary, and that the lower core box device is provided with a device (16) for tilting the lower core box (2) by 90º. 2. Horizontally divided molding machine according to claim 1, characterized in that the gas filling device (5) and the blowing device (4) are detachably connected to one another via a connecting device (6).