A kind of method that adopts hsm molding technology to prepare ice-curved rod

Abstract

The invention discloses a method for preparing an ice bent lever through an HSM forming process. Shapeable preformed thermal self-expanding high-energy rubber is placed into a product core material mold at first, the mold is assembled, heating is conducted for 3-30 min at 80-100 DEG C, slight expansion is conducted, wherein the volume multiplying rate before and after slight expansion is 1.01-1.5,a core material mold cavity is filled, cooling and demolding are conducted, a part is wrapped with prepreg then and put into a forming mold, the mold is assembled, heating is conducted for 10-60 minat 120-180 DEG C, wherein the shapeable preformed thermal self-expanding high-energy rubber continues being heated, expansion force is formed from inside to outside, and the fiber prepreg is subjectedto high-temperature curing forming; and cooling and demolding are conducted, and the part is taken out. The ice bent lever prepared through the method is high in strength and low in reject ratio.

Description

technical field [0001] The invention relates to the field of fiber composite material molding, in particular to a method for preparing ice curve rods by adopting an HSM molding process. Background technique [0002] The traditional preparation methods of fiber composite products are as follows; [0003] First, the hand lay-up process has problems in an atmospheric pressure environment. Most of the hand-lay-up resins are solvent-based, which has a heavy smell and is not environmentally friendly, which is not conducive to the health of the operators. It requires a long room temperature curing production cycle and is basically in a phase-out state; [0004] Second, the core material molding process, the pressure of the product during molding comes from the mold, that is, the rigid foam core material is used to outsource the cement layer and then the fiber prepreg is preformed. The rigid foam materials used include PMI, PU , PVC, balsa wood, etc. need to be cut by CNC into a pr...

AI Technical Summary

Problems solved by technology

[0003] First, the hand lay-up process has problems in an atmospheric pressure environment. Most of the hand-lay-up resins are solvent-based, which has a heavy smell and is not environmentally friendly, which is not conducive to the health of the operators. It requires a long room temperature curing production cycle and is basically in a phase-out state;

[0004] Second, the core material molding process, the pressure of the product during molding comes from the mold, that is, the rigid foam core material is used to outsource the cement layer and then the fiber prepreg is preformed. The rigid foam materials used include PMI, PU , PVC, balsa wood, etc. need to be cut by CNC into a pre-shaped core material, put into the mold cavity, heated and pressurized, and the resin is cured to form a product with high efficiency. Existing problems: 1. The process is complex and rigid foam core The material needs to be cut by CNC in advance, which increases equipment investment. 2. An additional cementation layer must be added to increase the cost of materials. 3. Due to uneven force, it is difficult to obtain an excellent product appearance; Therefore, the interlayer bonding force of the fiber is not good, the bonding is not uniform, and the overall strength of the product is easily delaminated; 5. Large-sized workpieces require large-tonnage presses, and the investment in equipment is large, which is not conducive to popularization

[0007] 1. Sheet-like high-energy glue is only suitable for preparing products with 2D effects when preforming carbon cloth; 2. The dimensional accuracy of preformed products is not accurately controlled, and the defect rate is high; 3. The thickness of the product exceeds 1cm, carbon cloth The difference between the size of the preform and the size after molding is large, which will cause the fibers to be pulled by the expansion force during the expansion molding process, resulting in stress concentration, and the interlayer bonding force inside the product is inconsistent, especially the quality of complex and thick products is uncontrollable