Molding method for producing a stator for a screw drilling tool using elastomer material

A molding method for producing a stator for a screw drilling tool using an elastomer material, comprising steps of:

• S1, roughening an inner surface of a stator tube of the stator, and then cleaning and drying the inner surface of the stator tube;
• uniformly mixing an adhesive and a diluent, coating the mixture obtained on the inner surface of the dried stator tube, and heating the inner surface of the stator tube for later use
• S2, uniformly coating a mold release agent on a surface of a mandrel mold, and heating or natural drying the surface of the mandrel mold for later use;
• S3, assembling the stator tube processed in step S1 and the mandrel mold processed in step S2 to obtain an assembled mold;
• S4, performing a vacuum defoaming under negative pressure on a mixture obtained by uniformly mixing a prepolymer of the elastomer material with a defoaming agent;
• and
• S5, uniformly mixing the prepolymer of the elastomer material defoamed in step S4 with a curing agent, and pouring the obtained mixture into the assembled mold obtained in step S3, sealing and curing the poured assembled mold by hierarchical heating;
• after the curing is completed, drawing the mandrel mold from the assembled mold, so that the stator is obtained wherein in step S4, the prepolymer of the elastomer material includes component A and component B, wherein, the component A comprises hydroxyl-terminated liquid rubber, polytetrahydrofuran diol and polyether polyol, and a mass ratio of hydroxyl-terminated liquid rubber, polytetrahydrofuran diol and polyether polyol is (0.2 to 1.0):
• (0.2 to 1.0):
• (0.2 to 1.0);
• and the component B comprises at least one of isocyanate, cyanate, and cyano compound.

A molding method for producing a stator for a screw drilling tool using an elastomer material comprising steps of:

• S1, roughening an inner surface of a stator tube of the stator, and then cleaning and drying the inner surface of the stator tube;
• uniformly mixing an adhesive and a diluent, coating the mixture obtained on the inner surface of the dried stator tube, and heating the inner surface of the stator tube for later use;
• S2, uniformly coating a mold release agent on a surface of a mandrel mold, and heating or natural drying the surface of the mandrel mold for later use;
• S3, assembling the stator tube processed in step S1 and the mandrel mold processed in step S2 to obtain an assembled mold;
• S4, performing a vacuum defoaming under negative pressure on a mixture obtained by uniformly mixing a prepolymer of the elastomer material with a defoaming agent;
• and
• S5, uniformly mixing the prepolymer of the elastomer material defoamed in step S4 with a curing agent, and pouring the obtained mixture into the assembled mold obtained in step S3, sealing and curing the poured assembled mold by hierarchical heating;
• after the curing is completed, drawing the mandrel mold from the assembled mold, so that the stator is obtained;
• wherein the curing by hierarchical heating is performed by curing through heating step by step, including 2 to 6 steps of heating, wherein, a temperature for curing is 60° C.˜160° C. and a time for curing at each stage is 1.5˜5 h.