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专利号联邦德国DE—PS3123363(B22 C21/00) 申请日期 1981年6月12日公布日期 1982年11月4日申请厂商联邦德国Heinrich Wagner公司真空造型法是无粘结剂造型法,它借助于面膜1和背膜2以及型砂4中的至少一个真空导管进行造型,导管周围有抽真空的孔(见西德专利DE—OS2248968,Giesserei.1973.№12.378)。在真空导管损坏时,为了阻止砂子和液体金属进入真空系统,该装置至少在一个砂箱壁上设有真空主通道5,主通道经筛状面6与容纳型砂的空间相通。真空导管3在向筛状面6过渡的端面7上也设有筛状面8,筛状
Patent No. Federal Republic of Germany DE-PS3123363 (B22 C21 / 00) Date of Application June 12, 1981 Date of Application November 4, 1982 Applicant Federal Republic of Germany Heinrich Wagner Vacuum modeling method is a binderless modeling method by means of Mask 1 and backsheet 2 and at least one vacuum conduit in molding sand 4 are shaped with evacuated holes around the conduit (see the German patent DE-OS2 248968, Giesserei. 1973. No. 12.378). In the event of damage to the vacuum conduit, in order to prevent sand and liquid metal from entering the vacuum system, a vacuum main channel 5 is provided in at least one of the walls of the flask, through which the main channel communicates with the space holding the molding sand. The vacuum conduit 3 is also provided with a sieve-like surface 8 on the end surface 7 which transitions to the sieve surface 6