40results about How to "Short forming cycle" patented technology

The invention relates to shell flanged hole part forming methods, in particular to a magnetic pulse flanged hole forming method for shells. The method aims at solving the problems that in the flanged hole manufacturing process of an existing steel die hole flanging method, the technology is complex, the production efficiency is low, and the production cycle is long. The method comprises the steps that firstly, the shape of a flanged hole coil bobbin is designed according to a curved surface shell with pre-manufactured holes; secondly, the curved surface shell with the pre-manufactured holes is arranged on a flanged hole forming female die, an edge pressing ring is arranged on the inner surface of the curved surface shell in the periphery direction, a hole flanging coil matched with the hole flanging deforming area is wound on the flanged hole coil bobbin, covers the hole flanging deforming area and is attached to the hole flanging deforming area, one end of a capacitor set is connected with one terminal of the hole flanging coil, the other end of the capacitor set is connected with one end of a gap switch, the other end of the gap switch is connected with the other terminal of the hole flanging coil, and the capacitor set is charged to reach the preset voltage value; thirdly, magnetic pulse flanged hole forming is carried out; fourthly, flanged holes are corrected. The method is used for forming flanged hole parts of shells.

This invention relates to a kind of acrylic resin compound used for filling hollow mold and its preparation method. This compound includes 45 to 90 shares acrylic resin according to weight, melt index is 1.5 to 5.0g / 10min; 5 to 90 weight shares inorganic filler hand led by coating , particle size is 1.0 to 10.0 mu M; 0.2 to 0.5 weight shares antioxidant. This compound is adaptable to hollow blow molding craft, possess higher rigidity, lower cost as well as shorter forming cycle comparing with traditional polypropylene hollow product; this resinoid compound also possess Heat distortion temperature, tenacity as well as favorable dimensional stability and thermal degradation, at the same time possess lower thermal coefficient of expansion, contraction ratio.

The invention discloses a method for eliminating grooves formed in the surface of a superplastic forming / diffusion bonding four-layer structure. The method comprises the steps that (1), the plate thickness of the superplastic forming / diffusion bonding four-layer structure is selected; (2), air inlets for forming the superplastic forming / diffusion bonding four-layer structure are machined in selected plates; (3), the plates with the machined air inlets are welded into a whole, and air inlet pipes are welded to the air inlets; (4), the whole plate with the air inlet pipes is heated, and air is introduced into the air inlet pipes to apply back pressure after the temperature of the whole plate reaches the certain temperature till diffusion bonding of the plate is completed; and (5), air is introduced into the air inlet pipes for pressurizing, and superplastic forming of the plate is completed. According to the method, the superplastic forming / diffusion bonding four-layer structure is formed through the method of applying the back pressure, the condition that the grooves are generated in the four-layer structure in the superplastic forming / diffusion bonding process can be effectively avoided, and the superplastic forming / diffusion bonding four-layer structure prepared through the method of applying the back pressure has the significant advantages on the aspects such as the part sizeprecision, the profile precision, the surface quality, the machining efficiency and the manufacture cost.