本文将讨论低压铸造作为一种金属制造技术，深入探讨其定义、历史、操作方式、工艺的优点和缺点以及其他相关主题。
低压铸造意味着什么？在低压压铸中，模具放置在熔融金属的液位处或上方，而重力压铸则将模具放置在熔融金属的液位下方。
- 低压铸造工艺可以追溯到20世纪初期
- 韦瑟里尔·朱尼尔，高级
- 1910年，同时在西德工作的格诺研究了使用电阻坩埚炉铸造铝青铜和锰青铜
- 大约在同一时间，F
- Lake，在英国工作，拥有用于处理铅和锡合金的专利设备
In 1917, France revolutionized the casting industry by introducing a low-pressure casting machine that worked by generating pressure through the evaporation of water.
After the war, E. C. Lewis of British Alumasc continued the research, achieving significant milestones such as the production of a light alloy beer barrel in 1950. The early adopters of the technique, such as the United Kingdom, the United States of America, Japan, and West Germany, were instrumental in propelling the technique's popularity, particularly in the production of aluminum alloy wheel hubs.
The ability of low-pressure casting, in particular with aluminum alloys, to produce high-quality and intricate metal parts is the primary factor that contributes to the significance of low-pressure casting in the manufacturing industry. This results in less gas being trapped, which in turn makes the cast products less porous and ensures the highest possible quality of the component parts. This carefully orchestrated process also enables the production of intricate geometries, such as relatively thin walls (about 3 mm) and minute details.
What steps are involved in the Low-Pressure Casting process? As a result of the permanent mold's higher capacity for output, it is the type of mold that is typically used rather than the sand mold. This mold has been carefully sealed to eliminate the possibility of any unwanted air infiltration. After these preliminary steps have been completed, the metal is placed in a furnace where it is heated to a temperature that is higher than its point of melting. After that, the molten metal is transported to a holding furnace, also known as a crucible, which is responsible for maintaining the temperature and purging the metal of any impurities that may be present. After that, the pressure inside the furnace is increased. Before the process of solidification can begin, any air trapped inside the mold must be released through vents that have been carefully positioned.
During the phase in which the molten metal is cooled, the solidification process occurs gradually, and the metal takes on the precise form of the mold cavity. Throughout this process, the pressure that is being applied is kept at the same level in order to fill any potential shrinkage pockets and guarantee that all of the mold's intricate details will be fully replicated by the metal as it solidifies. To arrive at the desired end product, Die-cast parts may be necessary to carry out additional procedures such as trimming, machining, and finishing, depending on the degree of difficulty presented by the component.
低压铸造过程中的气体截留使铸件质量优良且孔隙率极低。这一结果归功于低湍流、受控的模具填充过程以及填充冷却过程中收缩引起的空隙的持续压力。低压铸造能够复制具有精细细节且壁厚低至 3 毫米的复杂形状，这是该工艺的最大优势之一。
低压铸造工艺涉及哪些步骤？在熔炉中熔化金属合金，并将其加热至铸造温度。
使用低压 压铸零件生产零件的第一步 是在熔炉中熔化所需的金属合金。这启动了生产周期。加热过程将持续进行，直到材料达到铸造所需的温度。
2. 将液态金属移至位于模具下方的保温炉中。
将熔融金属加热到适当的水平后，将其移至位于模具下方的保温炉中。施加的压力通常低于 0.8 巴，这比其他铸造方法中施加的压力显着降低。该过程的缓慢性与低压铸造过程中控制的低压相结合，可以使材料平稳且受控地向上流动通过冒口并通过模具底部进入模具型腔。
4. 在金属凝固时保持模具型腔内的压力恒定
当模具型腔内的金属有时间凝固后，压力逐渐释放。在此步骤之后，通常会收集并回收剩余的任何熔融金属，以便尽可能少地浪费材料。触感凉爽的模具
，可轻松取出铸件 此时模具已包含已凝固的铸件，可进行冷却。当铸件有足够的时间冷却后，打开模具，取出成品。
