KR900003062B1 - Mold transfer assembly - Google Patents

Abstract

Apparatus for use in pouring molten metal in the manufacture of cast metal articles comprises a mould transfer device having two lifting devices depending from an overhead bridge structure, movable such that a first device moves an empty mould from a pickup position onto a molten metal pouring station, whilst simultaneously a second device lift and moves a filled moluld away to a set down location. Moulds include a molten metal height control and mould stopper closing mechanism. The mould is filled by bottom injection from a pressurised pouring tank.

Description

Injection assembly with mold transfer device

1 is a partial cross-sectional front view of the mold handling system according to the present invention.

FIG. 2 is a side view as seen from line 2-2 of FIG.

* Explanation of symbols for main parts of the drawings

10: mold 12: injection tank

14: injection tube 16: permanent column

18: lower casting 19: set-down crane

20, 22, 62: leg portion 24: upper frame assembly

25: pickup crane 26: intermediate support girder

28, 30: main support rail 32, 34: mold fixing cylinder

36: mold stopper 38: riser height control mechanism

40: empty mold pick-up part 42: set-down position

TECHNICAL FIELD The present invention relates to the manufacture of cast metal products, and more particularly, to fix a mold filled with molten metal from the injection portion while moving the hollow mold on the injection portion, and to move the mold filled with the molten metal. An apparatus and method are provided.

In the manufacture of cast metal products such as train wheels, it is important to manufacture such wheels as quickly as possible while maintaining the precision required for the final casting in terms of cost and energy savings. The lay-out of a representative wheel foundry is described in US Pat. No. 2,999,281. An upper mold portion, or cope, is placed over the bottom mold portion, or drag, to form a complete mold. Usually, the mold is a reusable graphite mold. When the complete mold is moved along the conveyor to a pick up station adjacent to the inlet, the pick-up crane lifts the mold and places it in a pouring station on the infusion tank. The mold is placed on an injection tank because a bottom pressure pouring method is used to inject molten metal into the mold. Ladles containing molten metal are placed in the injection tanks. The injection tank can be pressurized with air, thereby forcing molten metal to flow upward through the refractory injection pipe to the bottom of the mold. Before filling the mold, the mold must be held in place by an air cylinder which normally extends downward to contact the permanent mold.

In addition, the mold stopper assembly must be lowered by the air cylinder back onto the stopper hole of the mold. Finally, the riser height control mechanism must be lowered into the mold riser, whereby the height of the molten metal in the riser is measured and thus the injection operation is automatically controlled.

These three instruments, the hold down cylinder, the mold stopper and the riser height control mechanism, are used to pick up the mold filled with molten metal and transport it to the mold set down position where the mold continues to be processed along the conveyor. Pre-positioned on the mold set-down crane legs.

The mold filled from the mold discharge portion is continuously moved along the conveyors. The mold set-down crane and the mold pick-up crane are each rubbed in a column assembly with two legs, and the bipedal assemblies are mounted on one top frame assembly. Such an upper frame assembly is laterally movable along the secondary girder, and the secondary girder itself is capable of allowing the girder to move longitudinally relative to the inlet. And a crane assembly mounted on the girder.

Since the pick-up crane and the set-down crane are mounted on one upper frame assembly, the lateral movements of the crane moving along the secondary girder are performed simultaneously and their lateral travel distances are the same.

In the injection process of the known structure, the mold just filled with molten metal is placed in the injection section and the empty mold is located in the mold pickup section. The mold clamping assembly, mold stopper and riser height control strip are attached to the set-down crane and lifted out of the mold after completion of injection. Next, the set-down crane lifts the mold filled with molten metal and at the same time the pickup crane lifts the empty mold.

Thereafter, the frame assembly for supporting both cranes is moved laterally along the secondary girder. The mold filled with molten metal is placed at the set down point by the set-down crane, and the empty mold is placed in the injection section by the pickup crane.

The set down crane and the pick-up crane are then moved laterally along the side girder through their frame assemblies. When the set-down crane reaches the injection section, the mold clamping assembly and riser height control mechanism are lowered to the empty mold and the injection operation starts. After the mold is filled, the mold stopper is lowered.

It is an object of the present invention to provide an improved mold handling facility in an injection section.

The present invention provides an improved mold processing system for a bottom injection shareholder factory.

In the injection apparatus of the present invention, the mold filled with molten metal is moved from the injection portion by a set-down crane after the mold fixing assembly, the mold stopper and the riser height control mechanism are lifted from the mold. The empty mold is moved to the injection portion by the mold pick-up crane when the filled mold is moved out of the injection portion by the set-down crane. However, the mold fixing assembly, mold stopper and riser height control mechanism are not attached to the set-down crane but attached to the auxiliary girder so that the mold fixing assembly, the mold stopper and the riser as soon as the empty mold is placed in the injection section. The height control mechanism can be lowered onto the mold.

Thus, the injection operation can be started before the set-down crane is returned to the injection portion. In one casting, the time is reduced by about 8 seconds, and thus 1000 castings can be produced at the plant in 24 hours in 24 hours, resulting in a productivity increase of 10%.

According to the present invention, there is provided an injection assembly for use in the manufacture of cast metal products comprising an injection tank containing a mold transfer device, a bridge structure, and a ladle including an upper frame and two sets of legs, the upper frame Is adapted to move along the bridge structure, the injection tank may be joined so that molten metal is injected upward from the ladle therein, and the injection tank is located at the injection portion below the bridge structure, and the mold A first set of the leg portions of the transfer device is adapted to move the empty mold from the pick-up position to the injection portion, and a second set of the leg portions of the mold transfer apparatus is adapted to transfer a mold filled with molten metal to the empty mold. Adapted to move and move from the injection section to the set-down position, the bridge structure The blank mold includes a means for not (保持) of the mold in the state immediately after the male part so as to begin to fill, which is located at said inlet.

The present invention also provides a method of manufacturing a cast metal product comprising moving a mold filled with molten metal from an injection portion to a set-down position and simultaneously moving an empty mold from a pick-up portion to the injection portion.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings. The injection section and the mold handling system are shown in FIGS. 1 and 2. The mold 10 is located at the center of the injection portion and is positioned above the injection tank 12 and connected to the injection tank 12 by the refractory injection pipe 14. The mold 10 is composed of an upper mold 16 and a lower mold 18.

Typically, such a mold is made of a material that does not deform and uses compressed graphite as a refractory material. The set-down crane 19 has a front leg 20 and a rear leg not shown, and the pickup crane 25 has a front leg 22 and a rear leg 62. All of these legs are supported by the upper frame assembly 24.

Lower part 21 of the front leg 20 of the set-down crane and lower part of the rear leg, not shown, and lower part 23 and rear leg 62 of the front leg 22 of the pickup crane. Lower portions 64 are movable portions supported by the compressed air cylinders 50 and 51 in each crane. Lower portions of the legs of the set-down crane 19 and lower portions 23 and 64 of the ribs of the pick-crane 25 cooperate with each other to contact the mold 10 and to remove the mold. It works to lift. Upper frame assembly 24 is a beam structure that is movable laterally across intermediate support girder 26. The intermediate support girder 26 can move longitudinally across the main support rails 28, 30.

Molded cylinders 32 and 34, which are piston cylinders of compressed air type, and mold cylinders 36 and riser height control mechanism 38, which are also compressed air type cylinders with refractory stoppers, are intermediate supporting girders. 26 is installed hanging. The fire resistant stopper is usually mounted on a mold and is not connected to a cylinder. The riser height control mechanism 38 is of various types, but usually extends into the mold riser, and when it detects that the molten metal has risen to a predetermined height, a signal is generated to stop the injection of the molten metal.

When the upper frame assembly 24 moves to the right in the figure, the set-down crane leg 0 is aligned with the mold 10 at the inlet. At the same time as the mold 10 filled with molten metal is lifted by the set-down crane leg 20, the pickup crane 22 is located in the mold pick-up portion 40, where the pickup crane is empty. Will lift. As the upper frame assembly 24 moves to the left, the filled mold moves to the mold set-down portion 42 and sets down.

At the same time, the pick-up crane leg 22 lowers the empty mold into the injection portion. The fixed cylinders 32, 34 riser height control mechanism 38 is lowered to the empty mold and injection of molten metal is started. After the mold is filled, the mold stopper 36 is lowered. On the other hand, the upper frame assembly 24 moves to the right, lifts the mold filled in the injection portion by the set-down crane leg 20, and the mold pickup portion 40 by the pickup crane 22, Be prepared to lift your empty mold. Two second stationary cylinders 52, 53 are attached to the front leg 20 and the rear leg, not shown, of the set-down crane, and these cylinders are usually compressed air type piston cylinders. When moved from 12) to a set-down position 42, it serves to keep the filled mold closed.

Claims (7)

It consists of an injection tank containing a mold transfer device consisting of an upper frame and two sets of legs, a bridge structure, and a ladle, wherein the upper frame is configured to move along the bridge structure, and the injection tank has molten metal therein. Can be joined so as to be injected upward from the ladle and located at an injection portion below the bridge structure, wherein one set of legs of the legs of the mold transfer device moves the empty mold from the pick-up position 40 to the injection portion. The other set of legs is adapted to move the mold filled with molten metal from the injection section to the set-down section, at the same time as the hollow mold moves. Hold the mold in the inlet to begin filling with molten metal immediately after the mold is placed in the inlet. An injection assembly for the production of cast metal products having a structure having a means for guaranteeing. The injection assembly of claim 1, wherein the bridge structure further comprises a mold stopper comprising a closing mechanism. The injection assembly of claim 1, wherein the bridge structure further comprises a riser molten metal height control mechanism. The injection assembly of claim 1 wherein each set of legs has a cylinder to lift the mold. 2. The injection assembly of claim 1, wherein the means for retaining the mold in the injection section includes two air cylinders extending downward to contact the mold. 3. The injection assembly of claim 2, wherein the mold stopper is mounted on an air cylinder extending downward to contact the mold. 2. The injection assembly of claim 1, wherein the legs for moving the filled mold to the set-down portion have second fixed air cylinders adapted to hold the filled mold closed during movement. .

Images