Search

KR-20260063148-A - Mold structure for automation of centrifugal casting machine

KR20260063148AKR 20260063148 AKR20260063148 AKR 20260063148AKR-20260063148-A

Abstract

The present invention relates to a mold structure that contributes to the automation of a centrifugal casting machine by improving the mold structure so that a clamping groove of a predetermined depth is formed on the edge portion of the upper surface of an upper mold for centrifugal casting to ensure secure clamping, and a recessed groove of a predetermined depth is formed on the outer surface of a lower mold to allow for easy and secure gripping with a robot finger, thereby enabling effective pick and place operations. The upper mold and lower mold of the centrifugal casting machine are configured such that a clamping groove of a predetermined depth is formed on the edge portion of the upper surface of the upper mold and a recessed groove of a predetermined depth is formed around the outer surface of the lower mold to enable pick and place operations using a gantry robot hand or a jig, thereby allowing the mold to be moved, the mold to be replaced, and the lower mold to be flipped 180° to demold the centrifugal casting inside.

Inventors

  • 정소희

Assignees

  • 정소희

Dates

Publication Date
20260507
Application Date
20241030

Claims (5)

  1. Upper and lower molds of a centrifugal casting machine; A clamping groove of a predetermined depth formed at the edge portion of the upper surface of the upper mold; and A mold structure for the automation of a centrifugal casting machine, characterized by forming a recessed groove of a predetermined depth around the outer surface of a lower mold so that the mold can be moved, the mold replaced, or the lower mold flipped 180° to demold the internal centrifugal casting using a robot hand or jig.
  2. In claim 1; A support plate supporting the lower mold above; A pair of fixing members fixed at three or four locations on the edge of the support plate; A space formed at a predetermined interval between fixed parts; and The lower part of a clamp that is loosely fitted into the space and then pivotally installed with a pin; A mold structure for the automation of a centrifugal casting machine including
  3. In claim 1 or claim 2; A groove formed in the center of the bottom surface of the lower mold; A lifting plate installed at the center of the upper surface of the support plate and coupled to the groove above to raise and clamp the lower mold or lower and unclamp the lower mold; A through hole formed in the center of the lifting plate; and A fluid cylinder rod that penetrates through a through hole and is then fixed to the bottom surface of the lifting plate; A mold structure for the automation of a centrifugal casting machine including
  4. In claim 1 or claim 2; The above clamp has a long straight section, and A horizontal section that is bent at a right angle and has a short length, and A catch portion that is bent downward at the end of the horizontal portion and engages in a clamping groove; A mold structure for the automation of a centrifugal casting machine including
  5. In claim 1 or claim 2; A mold structure for the automation of a centrifugal casting machine, wherein an axle tube that rotates at high speed in one direction by means of a motor and a power transmission means is installed so as not to come into contact with the outer surface of the above fluid cylinder rod, the upper and lower parts of the axle tube are supported by a main body through an axle bearing, a support plate is fixed to the upper part of the axle tube, a fluid cylinder that rotates along the axle tube is fixed to the lower part of the axle tube, the fluid cylinder rod passes through a vertical through hole formed in the center of the hollow part of the axle tube and the support member, a lifting plate that supports and raises or lowers a lower mold is fixed to the end of the fluid cylinder rod, a rotary joint that supplies fluid without twisting is installed in the fluid cylinder, and the rotary joint includes a fluid unit and a control unit that control the fluid cylinder.

Description

Mold structure for automation of centrifugal casting machine The present invention relates to a mold structure for the automation of a centrifugal casting machine. It is designed to enable robust clamping by forming a clamping groove of a predetermined depth or an upwardly protruding clamping projection on the upper edge of the upper surface of the upper mold for centrifugal casting, and to enable effective pick and place operations by forming a recessed groove of a predetermined depth on the outer surface of the lower mold so that it can be easily and firmly gripped by a robot hand (finger). This contributes to the automation of the centrifugal casting machine. Generally, a centrifugal casting machine for centrifugally casting ring-shaped products is configured by assembling (combining) an upper mold and a lower mold, fixing them so as not to separate using a clamp or fastening member, and then injecting molten liquid while rotating them at high speed using a motor and a power transmission means to perform centrifugal casting. An injection port of a predetermined size is formed in the upper mold to allow the injection of high-temperature molten liquid, and a power transmission means is provided on the rotating shaft that rotates the lower mold to transmit the rotational force of the motor. When the upper and lower molds are rotated at high speed, high-temperature molten liquid is injected through the injection port of the upper mold, and when centrifugal casting is finished, the machine is stopped, the upper and lower molds are disassembled (separated), the cast product is removed from the mold, cooled, and then processed into a finished product or semi-finished product using a lathe or the like. The above-mentioned conventional centrifugal casting machine proceeds by repeating the process of clamping the assembled upper and lower molds with a clamp or fastening the upper and lower molds with bolts and nuts before injecting the molten metal, centrifugally casting by injecting the molten metal, then unclamping or loosening the bolts and nuts to separate and dismantle the upper and lower molds, and finally pulling out the cast product. During this process, the clamping and unclamping operations, as well as the fastening and unfastening of the upper and lower molds using bolts and nuts, all rely on the hands of the operator. At this time, as molten metal reaching a high temperature of approximately 1,700°C is repeatedly injected into the mold handled by the operator, the temperature of the mold and its surroundings rises to approximately 600–700°C. This high temperature heat is directly transmitted to and acts upon the operator, creating an extreme working environment. Furthermore, despite the operator's caution, the molten metal may come into contact with bare skin exposed through gaps in the protective gear worn by the operator, or may splash onto bare skin, causing severe burns. Due to the nature of the fastening and unfastening of bolts and nuts used when assembling and disassembling upper and lower molds, the workers' bodies are in a bent position, which causes severe pain and musculoskeletal disorders. Although an easy-to-handle one-touch locking device has been devised and provided to improve this extreme working environment, safety accidents often occur when the lock is released during use. Furthermore, at the moment the molten liquid is injected into the mold through the injection port, the special oil treated inside the mold oxidizes and expands due to high heat, and the internal air also expands and is expelled to the outside of the mold through the injection port. At this time, because the inner diameter of the injection port is narrow, the expanded air that is not expelled instantaneously exerts a significant force pushing against the upper and lower molds. Since the mold itself is rotating at high speed, unexpected situations occur, and cases where the one-touch locking devices are released often occur, failing to gain reliability regarding safety. In other words, when the clamping of a mold rotating at high speed during the centrifugal casting process is released, the mold, weighing 20 kg to 100 kg, flies away and causes impact to the surroundings, and the high-temperature (1400°C to 1700°C) molten metal rotating along the mold is scattered out of the mold by centrifugal force, leading to various problems such as major casualties. FIG. 1: Plan view illustrating the clamping state of a centrifugal casting die as an example of the present invention. FIG. 2: An example cross-sectional view of the clamping state of a centrifugal casting die illustrated as an example of the present invention. FIG. 3: An example cross-sectional view of the unclamped state of a centrifugal casting die illustrated as an example of the present invention. FIG. 4: An exemplary cross-sectional view of the upper mold, lower mold, and clamp of a centrifugal casting die shown as an example of the present invention. FIG. 5: Cr