Flask machining requirements 1) sand box machining allowances, sand box manufacturer, according to GB / T6414-1999 mechanical allowance requirements, but also make their own determination based on casting or machining situation. 2) the processing sand box binning surface, should pay attention to the height of the wedge, sand box specifications, and maintain a predetermined tolerances on drawings. 3) sandbox process allows a small amount of porosity, shrinkage, if necessary, Dongying sand box, without affecting the strength and the use of conditions, welding, after welding to be stress relieved. 4) positioning pins, sleeve holes should be boring or press jig machining, sand box sales, to ensure that the size of the pattern on the deviation and vertical tolerances support provision. 5) sand box casement sink hole and concentricity humpback hole with coaxial plug inspection, should be free to access. The main technical indicators Editor 1. Temperature range: RT ~ 45 ℃ 2. Through the sieve of 75um, diameter of the wire square hole sieve 50um dry talc. 3. Dust concentration: 2 ~ 4kg / m3 4. Blowing sand Time: 1S ~ 99H adjustable 5. Rapping Time: 1S ~ 99H adjustable 6. Timing range: 0 ~ 99H security sandbox Dongying | Dragon Industrial | sandbox provided by the Industrial Development Co., Ltd. Shandong dragon. Dongying sandbox | Dragon Industrial | sandbox Shandong dragon Development Co., Ltd. (www.julongshiye.com/) this year introduced a new upgrade, the above picture is for reference only, please call the telephone or pictures on this page, For the latest information, contact: Mr. Wang.