1.型砂的固化剂根据不同的气温合理选择；2.型腔表面的涂料层进行火焰烘

1. sand reasonable choice depending on the curing agent temperature; <br>coating layer 2 of the cavity surface and fire baked performed using hot air drying at least 30min, and increase the strength of the cavity, to avoid deformation; <br>3. "processing operations instructions "clear projection processing must be synchronized separately prohibited repair process, to ensure the flatness of the four boss; <br>4. develop specific verification of the rough gage, respectively, and machining deformation and the flatness of the two aspects; <br>processing means required to effectively identify whether the blank due to the deformation occurring when the effect of the size after processing folder.

1.型砂的固化剂根据不同的气温合理选择；<br>2.型腔表面的涂料层进行火焰烘烤并采用热风机进行至少30min的吹干，增加型腔的强度，避免变形；<br>3.《加工作业指导书》明确凸台的加工必须同步，严禁单独返修处理，确保四个凸台的平面度；<br>4.制定专门的检具分别验证毛坯和加工两个方面的变形和平面度的情况；<br>加工装夹时需有效的识别毛坯是否因存在的变形影响加工后的尺寸。

1. The curing agent of molding sand should be selected reasonably according to different temperature;<br>2. The coating layer on the surface of the cavity is baked by flame and dried by hot air blower for at least 30min to increase the strength of the cavity and avoid deformation;<br>3. The processing operation instruction specifies that the processing of boss must be synchronous, and it is strictly prohibited to repair separately to ensure the flatness of four bosses;<br>4. Develop special inspection tools to verify the deformation and flatness of blank and machining;<br>It is necessary to effectively identify whether the size of the workpiece after machining is affected by the deformation.