At left, inspectors check the interior flask wall length with a quick gage and level. For check- ing flask height and parallel- ism, a go-gage is used, at right. Inner wall length, height and parallelism are just some of the measurements that should be checked during flask inspection. Checking flasks on a regular basis is important to assure a quality casting.
在左边，检查员用尺规和水 平仪检查砂箱内壁的长度。使 用通过量规检查砂箱的高度和 平行度。砂箱内壁的长度、高 度和平行度只是砂箱检查过程 中应检查测量的一些方面。定 期检查砂箱对保证铸件质量非 常重要。
life correlates directly to flask life and serviceability. Worn flasks consume hardware (e.g. pins and bush- ings) at a higher rate than flasks maintained within dimensional specification.
How Can I Extend My Flask’s Lifetime? Te following are general guidelines that can extend the
service life of your flasks and provide indications of their dimensional stability and future serviceability. Step 1. Evaluate casting quality and molding productivity
• Is casting quality affected by the condition of your flasks? Ultimately, this is the only determining factor for the level of care and attention the flasks need.
• Is the productivity of the molding line affected by the flasks? Do you experience lost time from jam-ups, flasks not locating or flasks out of position in the molding line?
• Do you check and maintain the flask hardware, pins, bushings, clamps, hooks and bumpers? When dealing with flasks, the sum of the parts is greater than the whole. It is good practice to change pins and bushings frequently, before they become worn and defective. Step 2. Act on the Step 1 Evaluation
• Know the functions of your flasks that affect mold and casting quality. The functions could be pattern engage- ment, pattern strip-off/disengagement, strike-off, roll-over, drag set-on to pallet car (when applicable), drag positioning for core-setting, sprue drilling (when applicable), mold closing, mold clamping (when appli- cable), cope flask weight set-on (when applicable) and flask cleaning station.
• Know what points on your flasks are critical contact points. Today’s automatic molding lines rely on accurate flask positioning and travel from station to station regard- less of the actual flask size or condition.
• Set up and maintain procedures for checking the condi- tion of the flask and its hardware. Duplicate the condi- tions of the molding line as much as possible to account for possible dimensional stack-up error.
• Be consistent. Document and include procedures for flask assessment, corrective action, flask inspection, flask repairs, and specific measurement and replacement procedures for flask hardware. ■
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如何延长砂箱寿命？
以下准则可以延长砂箱寿命，并且显示砂箱的尺寸 精度以及未来可用性
第一步，评估铸件质量和造型生产率
• 砂箱是否影响了铸件质量？这是确定砂箱需要如何 维护的唯一决定因素。
• 砂箱是否影响了造型线的生产率？你是否曾因造 型线上阻塞、砂箱定位不当或者砂箱脱位而耽误 了时间？
• 你检查和维护砂箱硬件，销、衬套、夹钳、吊钩 和减震器吗？对于砂箱，各部分的总和大于整 体。在销和衬套磨损或出现缺陷之前要注意更 换，这种做法很好。
第二步，根据第一步结果采取行动
• 砂箱的功能影响砂型和铸件质量。这些功能可能 是合箱、脱模、刮平、翻转、放到输送小车上（ 需要时）、砂芯定位、打浇口（需要时）、合 模、锁模（需要时）、设置压铁（需要时）和砂 箱清理。
• 知道什么地方是砂箱重要的接触点。现今的全自动 造型线依赖于准确的砂箱定位，不论砂箱尺寸如何 均可以从一个工位移至下一个工位。
• 建立和保持砂箱和其硬件的检查程序。尽可能拷贝 造型线的工艺条件，这样可以发现可能的错箱。 • 保持始终如一。记录砂箱评估、纠正措施、检查
砂箱、砂箱维修、特殊测量和更换砂箱硬件的程 序。■
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Spring 2012
FOUNDRY-PLANET.COM | MODERN CASTING | CHINA FOUNDRY ASSOCIATION | 51
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