Application of STMMA copolymer sheets
STMMA casting-specific sheets have attracted widespread attention and great interest from theautomobile mold industry and machine tool casting industry since its launch. We have applied STMMA copolymer sheets produced by a mold casting company of Anhui Province and a mold casting company ofHebei Province, the most famous domestic companies in batches, with a very significant effect.
(1) A company in Anhui Province mainly produces automobile covering molds and provides them to well-known domestic automobile companies. The casting blank has a maximum weight of about 30T EPS sheets that have been used for foam pattern making. Problems of easy deformation, numerous carbon defects, large machining allowances, high cutting costs, high repair costs, long lead time, and high mold scrap rate are mainly found.
Test plan: Use Castchem STMMA copolymer sheets with a pre-foaming density of 22± 1kg/m³. The pattern-making and coating processes remain unchanged, and the casting rate in the black area remains unchanged. The casting temperature is between 1,450~1,500'c and the negative pressure increases accordingly. No reverse squish is found during the casting process. Test results: The casting results show that on an area of 12m2, there are only 3 carbon defects in the processing area of 3-5mm, 2 of which are minor, The machined surface is very smooth and beautiful, and the overall casting quality has been greatly improved. Compared with EPS sheets, carbon defects have been greatly increased. The machining allowance can be controlled at about 10mm, half that of EPS. It can greatly save cutting and repair costs, shorten the lead time, and reduce the scrap rate, as shown in Figure 1.6:
(2) A company of Hebei Province mainly produces automobile covering molds and is a direct subsidiary of a famous domestic automobile brand and a well-known domestic automobile covering mold casting company. The casting blank has a maximum weight of about 30T, and EPS sheets have been used for foam pattern making. Problems of easy deformation, numerous carbon defects, large machining allowances high cutting costs, high repair costs, long lead time, and high mold scrap rate are mainly found. Test plan: Use Castchem STMMA copolymer sheets with a pre-foaming density of 18±l KG/m3. The full mold manufacturing and coating processes remain unchanged, and the casting speed in the black areas remains unchanged. The casting temperature is between 1,450~1,500'c, and negative pressure is increased accordingly, No reverse squish is found during the casting process.
