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吉林省松江河林业局纤维板厂的4000吨多层液压机是年产纤维板1900米~3的重要设备。其四个主缸系柱塞式结构,材质为35~#铸钢,内径800毫米,壁厚115毫米,工作压力为260公斤/厘米~2。其中一号主缸因铸造缺陷,于1984年3月开裂漏水,裂纹长250毫米。经多次补焊无效,裂纹长度扩展至670毫米左右,且裂纹两侧又增生三条300～400毫米的裂纹(图1)。在四条裂纹附近,形成深10毫米、长50～100毫米不等的龟裂纹多处。径采用挖补法修复,获得了成功,现已安全运行近一年。
Jilin Province Songjiang River Forestry Bureau Fiberboard Plant 4000 tons of multi-layer hydraulic press is an important annual output of fiberboard 1900 m ~ 3. The four master cylinder plunger structure, made of 35 ~ # steel, diameter 800 mm, wall thickness 115 mm, the working pressure of 260 kg / cm ~ 2. One of the master cylinder due to casting defects, cracking in March 1984 crack, crack 250 mm long. After repeated welding is invalid, crack length extends to about 670 mm, and cracks on both sides of the proliferation of three 300 ~ 400 mm crack (Figure 1). In the vicinity of four cracks, the formation of deep 10 mm, 50 to 100 mm long cracks ranging from cracks. Tracing the use of digging repair method, has been successful, has been operating safely for nearly a year.