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精密铸造用水溶性蜡芯制取的 蜡模尺寸精度控制研究
Study on Dimension Precision Control of Wax Pattern Using Water Soluble Wax Core in Investment Casting
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- DOI:
- 作者:
- 孙 冰，常化强，董振江，李 帅，乔海滨，王 哲，李渤渤
SUN Bing, CHANG Huaqiang, DONG Zhenjiang, LI Shuai, QIAO Haibin, WANG Zhe, LI Bobo
- 作者单位:
- 洛阳双瑞精铸钛业有限公司
LuoYang Shuang Rui Precision Casting Titanium Co., Ltd.,
- 关键词:
- 水溶芯；复合蜡模；尺寸精度；收缩率
water-soluble core; compound wax pattern; dimensional accuracy; contraction
- 摘要:
- 研究了水溶芯与蜡模外模复合制蜡过程中的水溶芯及蜡模在不同尺寸、不同收缩状态下的收缩规律。 设计
并采用回字形阶梯模型，开展了水溶芯与中温蜡外模复合制蜡工艺实验，分析了水溶芯压蜡对蜡模外模自由收缩尺寸
及限制收缩尺寸的影响。 结果表明， 蜡模内腔基础尺寸 5~40 mm 时， 蜡模与水溶芯接触部分受阻收缩的线收缩率为
0.34%~0.77% ，比自由收缩低 50% 左右；随着基础尺寸的增加，受阻线收缩量增大，收缩率逐渐降低；同时，在冷却阶段，
水溶芯阻碍蜡模凹缩变形，更好地保证了蜡模尺寸及表面质量。 试制蜡模内腔尺寸波动控制在 0.1 mm 以内，较传统工
艺尺寸精度提高了 70% ，蜡模表面质量得到了很大的提高。
The shrinkage law of water-soluble core and wax mold under different size and different shrinkage state in the
process of compound wax making with water-soluble core and wax mold was studied. A zigzag step model was designed
and used to carry out the compound wax making process experiment of water-soluble core and medium-temperature wax
outer mold. The influence of water-soluble core pressing wax on the free shrinkage size and limited shrinkage size of wax
outer mold was analyzed. The results show that when the base size of wax mold is 5~40 mm, the linear shrinkage of the
contact part between wax mold and water-soluble core is 0.34%~0.77%, which is about 50% lower than that of free
shrinkage. With the increase of foundation size, the amount of constricted line shrinkage increases and the shrinkage rate
decreases gradually. At the same time, in the cooling stage, the water-soluble core prevents the wax mold from concave
deformation, which better ensures the size and surface quality of the wax mold. The size fluctuation of the inner cavity of
the wax mold is controlled within 0.1 mm, which is 70% higher than that of the traditional process. The surface quality of
the wax mold is greatly improved.