手轮系易裂件。在教科书或手册里都有记述,把其列为防裂的典型件,然而只是原则、概念性地提出一些防裂措施。我们在生产φ320、φ250手轮过程中,经过较长时间实践摸索,用对比分析筛选出采取“热补偿”方法解决手轮裂纹,已取得显著效果。现就“热补偿”法和效果简介如下。一、热补偿法所谓“热补偿”法即是在靠内浇口的轮缘与轮辐之间的地方加一个补缩冒口,用人为的方法扩大热节使远离冒口的部份先凝固,补缩冒口下面和冒口附近,由于受到浇口、冒口的热作用,较迟凝固,造成顺序凝固。这样,由于温差作用,当先冷却凝固的部份已进入弹性 Hand wheel system easy to crack pieces. In textbooks or manuals are described, listed as a typical anti-cracking pieces, but only the principle, put forward a number of conceptual crack prevention measures. We in the production of φ320, φ250 hand wheel process, after a long period of practice to explore, using comparative analysis to filter out the use of “thermal compensation” to solve the hand wheel cracks, has achieved remarkable results. Now on the “hot compensation” law and the effect is as follows. First, the thermal compensation method The so-called “thermal compensation” method that is by the gate within the wheel rim and spokes plus a refueling riser, the artificial way to expand the heat section so far away from the riser part of the first solidification , Under the feeder riser and riser near, due to the gate, riser thermal effect, later solidification, resulting in the order of solidification. In this way, due to the effect of temperature difference, the portion that is first cooled and solidified has entered the elasticity