大型機床鑄件的鑄造工藝詳細介紹
時間：2015/12/30 10:07:36
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大型機床鑄件主要是用于機床的平板制造，簡單接受一下鑄造工藝。
低壓鑄造是使液體金屬在壓力作用下完成充填型腔及凝固過程二獲得鑄件的一種鑄造方法。由于所用的壓力較低（20~60kPa），所以叫做低壓鑄造。其工藝過程是：在密封的坩堝（或密封罐）中，通入干燥的壓縮空氣，金屬液在氣體壓力的作用下，沿升液管進入直澆道3上升，通過內澆道2平穩(wěn)地進入型腔1，并保持坩堝內液面上的氣體壓力，一直到鑄件完全凝固為止。然后解除液面上的氣體壓力，使升液管中未凝固的金屬液流回坩堝，再開型并取出鑄件。低壓鑄造過程的基本特點：充填速度、壓力可適當調整。
低壓鑄造所用的鑄型，有金屬型和非金屬型兩類。金屬型多用于大批、大量生產的有色金屬鑄件，非金屬鑄型多用于單件小批量生產如砂型、石墨型、陶瓷型和熔模型殼等都可用于低壓鑄造，而生產中采用較多的還是砂型。但低壓鑄造用砂型的造型材料的透氣性和強度應比重力澆注時高，型腔中的氣體，全靠排氣道和砂?？紫杜懦觥槌浞掷玫蛪鸿T造時液體金屬在壓力作用下自下而上地補縮鑄件，在進行工藝設計時，應考慮使鑄件遠離澆口的部位先凝固，讓澆口最后凝固，使鑄件在凝固過程中通過澆口得到補縮，實現(xiàn)順序凝固。
Casting Technology of Large Machine Tool
Bed Castings
Large machine tool castings are mainly used
for flat plate manufacturing of machine tools, simply accept the casting
process.
Low pressure casting (LPC) is a casting
method that enables liquid metal to complete filling cavity and solidification
process under pressure. Because the pressure used is low (20-60 kPa), it is
called low pressure casting. The process is as follows: in a sealed crucible
(or sealed tank), dry compressed air is introduced into the crucible. Under the
action of gas pressure, the liquid metal rises along the riser tube into the
straight runner 3, enters the cavity 1 smoothly through the inner runner 2, and
maintains the gas pressure on the liquid surface of the crucible until the
casting solidifies completely. Then the gas pressure on the liquid surface is
relieved so that the solidified liquid metal in the riser can flow back to the
crucible, and then the casting is opened and removed. The basic characteristics
of low pressure casting process: filling speed and pressure can be adjusted
appropriately.
There are two kinds of moulds used in low
pressure casting: metal and non-metal moulds. Metal moulds are mostly used for
large-scale production of non-ferrous metal castings, and non-metallic moulds
are mostly used for single small-scale production such as sand moulds, graphite
moulds, ceramic moulds and molten model shells, which can be used for low
pressure casting, while sand moulds are mostly used in production. However, the
permeability and strength of sand moulding material for low pressure casting
should be higher than that of gravity casting. The gas in the cavity is
discharged by exhaust duct and sand pore. In order to make full use of liquid
metal feeding castings from bottom to top under pressure in low pressure casting,
it is necessary to consider solidifying the castings away from the gate at
first, and solidifying the gate at last, so that the castings can be
compensated through the gate in the solidification process, so as to realize
sequential solidification.
Company name: botou zhuoyuan mechanical equipment manufacturing co.,LTD
Registered
address: jiaohe development zone, botou city, hebei province
Fax
number: 0317-8031093
Contact
information: 15369812793 (WeChat with the same number) liansheng chu
Postcode:
062151
Enterprise
email:
1358827475@qq.com
Account
Opening Bank: Botou Branch of Bank of China
Account
number: 100399943203
Agricultural
bank account number: 6228481739059615270
http://zhuoyuanjixie.com