Alumina ceramic integrated hot press molding machine and working method thereof

Patent metadata

Field	Value
Publication number	US-11890781-B2
Application number	US-202017280062-A
Country	US
Kind code	B2
Filing date	Feb 6, 2020
Priority date	Dec 27, 2019
Publication date	Feb 6, 2024
Grant date	Feb 6, 2024

Abstract

An alumina ceramic integrated hot press molding machine and working method thereof, including a pressing and hot pressing device fixed accordingly on a rack, a stirring device inside the hot pressing device, and a hot pressing mold above the hot pressing device; the pressing device enables one path of high-pressure air to act on the mold, and enables the other path to enter the hot pressing device, so the slurry flows into a cavity of the mold; the stirring device stirs the slurry inside the device, so alumina blanks are more evenly distributed therein; and temperature detection components for detecting the temperature of internal oil and the slurry at a slurry outlet are inside the hot pressing device, and the power of an electric heating device is adjusted and controlled in real time according to the temperature detected by the components, to achieve the purpose of accurate temperature control.

First claim

What is claimed is:

1. An alumina ceramic integrated hot press molding machine, comprising a pressing device and a hot pressing device which are fixed on a rack, wherein the hot pressing device is located below the pressing device, a stirring device is disposed inside the hot pressing device, and a hot pressing mold is disposed above the hot pressing device;
the pressing device enables one path of high-pressure air to act on the hot pressing mold, and enables another path of high-pressure air to enter the hot pressing device, so that a slurry flows into a cavity of the hot pressing mold;
wherein the pressing device comprises threaded connecting rods on both sides of a lifting frame, a piston pressing rod and a return spring disposed in a lifting frame pressing rod stroke cavity, and a flange surface end cover disposed on a lug boss of the lifting frame, the lifting frame is fixed on the threaded connecting rods, a high-pressure air pipe is connected with the flange surface end cover, and high-pressure air is divided into two paths through an air valve and flows out at the same time, wherein one path of air flows to the piston pressing rod stroke cavity on the lifting frame through the high-pressure air pipe, so as to push the piston pressing rod to tightly press the hot pressing mold;

the stirring device is configured to stir the slurry inside the hot pressing device, so that alumina blanks are more evenly distributed in the slurry;
temperature detection components for detecting a temperature of internal oil and a temperature of the slurry at a slurry outlet are respectively disposed inside the hot pressing device, and power of an electric heating device is adjusted and controlled in real time according to the temperatures detected by the temperature detection components, so as to achieve a purpose of accurate temperature control; and
the electric heating device and a thermocouple are disposed above a grouting pipe near a position where the slurry outlet is formed, so as to accurately control the temperature of the slurry at the slurry outlet.

2. The alumina ceramic integrated hot press molding machine according to claim 1 , wherein a core plate of the hot pressing mold is provided with a core plate positioning column, a core backing plate, an upper mold, a cavity, a lower mold and a slurry inlet plate are positioned and assembled in sequence through the core plate positioning column, and a bottom of the lower mold and an internal junction of a core clamping block and a model cavity have rounded transitions, so that deformation of castings due to stress concentration can be significantly improved.

3. The alumina ceramic integrated hot press molding machine according to claim 1 , wherein the hot pressing device comprises an oil bath box and a flange thimble disposed at an upper part of an oil bath box support lug ring, and a slurry bucket and a slurry outlet end cover are disposed on a lug boss on an inner side of the flange thimble in sequence; and
a space between the oil bath box and the slurry bucket is filled with oil, a temperature of the oil is accurately controlled through a second electric heating device and a second thermocouple disposed inside, and the grouting pipe is disposed inside the slurry bucket below the slurry outlet end cover.

4. The alumina ceramic integrated hot press molding machine according to claim 1 , wherein the stirring device comprises an impeller disposed at a bottom of a slurry bucket, a motor on the rack, and a transmission device; and alumina blanks are distributed more evenly in the slurry through the stirring action of the impeller.

5. The alumina ceramic integrated hot press molding machine according to claim 1 , wherein the piston pressing rod inside the pressing device directly faces the center of the slurry outlet, and a height of the piston pressing rod is adjusted through an interaction of positioning nuts and tightening nuts on the threaded connecting rods, so as to be suitable for molds of different heights.

6. The alumina ceramic integrated hot press molding machine according to claim 1 , wherein a second electric heating device composed of a plurality of U-shaped heating pipes and a second thermocouple are disposed inside an oil bath box, and a working power of the electric heating device is adjusted and controlled in real time according to a reading on a temperature control box fed back by the second thermocouple.

7. The alumina ceramic integrated hot press molding machine according to claim 1 , wherein the thermocouple and the electric heating device are disposed on the grouting pipe inside a slurry bucket, and the working power of the electric heating device is adjusted and controlled in real time according to a reading on a temperature box fed back by the thermocouple on the grouting pipe.

8. The alumina ceramic integrated hot press molding machine according to claim 1 , wherein a space between a transmission shaft of the stirring device and a slurry bucket is filled with a packing material, a gland of the stirring device is located at a bottom of an oil bath box, internal threads are disposed inside the gland, the gland is in threaded connection with a convex head of the slurry bucket, and the gland is in clearance fit with an oil outlet of the oil bath box; a pressing sleeve is configured to tightly press the packing material as the gland rotates along external threads of the convex head of the slurry bucket, and thus, leakage of the slurry is avoided by virtue of a labyrinth effect of the packing material; the gland tightly presses rubber sealing rings located on a slurry bucket base and an oil bath box base at the same time, and thus, leakage of the oil is avoided; and furthermore, transmission efficiency of the transmission shaft is higher under the cooperation of multiple sets of bearings.

Assignees

• Univ Qingdao Technology
• Shenyang Hongyang Prec Ceramics Co Ltd

Inventors

• Li Changhe
• Shi Mingcun
• Ma Xiangyang
• Zhang Yanbin
• Yang Min
• Cui Xin
• Ma Xiaohong
• Gao Teng
• Wang Xiaoming
• Hou Yali
• Zhai han
• Wang Zhen
• Lu Bingheng
• Cao Huajun
• Zhang Naiqing
• Wu Qidong

Classifications

• B28B3/025 Primary

  Hot pressing, e.g. of ceramic materials · CPC title

• B28B13/0235

  the feed box being provided with agitating means, e.g. stirring vanes to avoid premature setting of the moulding material (agitation in general B01F) · CPC title

• B28B17/0081

  Process control · CPC title

• B28B13/021

  by fluid pressure acting directly on the material, e.g. using vacuum, air pressure · CPC title

• B28B13/0275

  Feeding a slurry or a ceramic slip · CPC title