摘要:
Method for tempering a moulding tool intended for production of products of natural or synthetic polymers, which moulding tool includes one or more moulding parts made of sintered metal with communicating pores obtained by pressing at a high pressure and sintering at a high temperature of a powdered material, in which moulding part or parts a moulding cavity has then been made, whereby preferably the outer envelope surface of the moulding tool is tight. The method comprises tightly connecting one or more channels, capillary tubes or the like through the tight outer envelop surface to the mould material of the moulding tool situated inside, which material contains a large number of small communicating pores and feeding a gas having a suitable state and a suitable temperature through the channels thereby causing a rapid tempering of the moulding tool to a desired extent.
摘要:
A helically wound and helically ribbed plastic tubing incorporating an electrically conductive heating wire and an apparatus and method for making the tubing are disclosed. A plastic ribbon is wound about an axis into a tube with one edge of each lap overlapping and heat-bonded to an edge of the preceding lap as the tubing is rotated; a conductive wire is embedded in the ribbon; and a bead is applied and heat-sealed onto the tubing, encapsulating the conductive wire during rotation of the tubing, providing a unitary structure including a conductive wire integral to a flexible tubing having a corrugated crevice-free outside and a smooth inside. Coolant is applied to the tubing for cooling the unitary ribbon, wire and bead tubing and to assist in advancing the tubing along the axis.
摘要:
Separable upper and lower rims of a post-cure tire inflator requiring no upper rim replacing operation which requires much time and labor especially when mounting the upper rim, and also no time and labor for holding a lower rim upward when mounting. In the upper and lower rim for holding the bead section of the tire, a high-pressure air is filled in a cured tire discharged from a tire curing press to thereby inflate and cool the tire; therefore at least the upper rim has stairway-like steps having two or more outer diameters fit to the bead diameters of tires of different sizes and formed by extending a small outer diameter on a large outer diameter.
摘要:
A hot air cold form pin welding device for use in assembly of work pieces using thermoformable and pressure deformable synthetic resin studs. A hot air heater is positioned in a support structure that isolates heat transfer along with multiple power and air cycling to reduce heat build-up. The cold forming pin assembly with internal heat dissipation and airflow structure forms and presses a replasticized pin significantly reducing the cold pin press cycle time.
摘要:
A method for manufacturing a joint pipe from a spirally wound thermoplastic profile is described in which the pipe end to be furnished with a joint pipe is pushed onto a rotatably driven, slightly conical mandrel, after which a melt profile of thermoplast is extruded and spirally wound in overlapping wraps around the mandrel and the pipe end in a direction extending from a point furthest from the pipe end, followed by cooling of the joint pipe, cutting of its end surface, and removal of the pipe end from the mandrel.
摘要:
A method and apparatus for making prosthetic socket preforms, a method for making prosthetic sockets, and a socket attachment component are disclosed. The method of making preforms of the present invention involves the blowmolding of memory plastics with a cooling step prior to parison expansion to enhance the molded-in stresses of the resulting preform. The blowmolding apparatus of the present invention comprises two mold halves having specially designed knifing sections and a modified blow pin. The method for making prosthetic sockets involves heat- and vacuum-forming memory plastic preforms over a positive cast of a residual limb after preheating of the cast to prevent heat-sinking. The socket attachment component disclosed is adapted for molding with a prosthetic socket during heat- and vacuum-forming, is configured to receive a sleeve attachment shaft, and possesses an integral male member for attaching the component and socket to an artificial limb shaft using bolts or screws.
摘要:
Rapid cooling of molded workpieces such as PET parisons formed in an injection molding machine is provided by a receiver receiving molded workpieces upon ejection from the molding machine, the receiver being transported out of the molding machine to an adjacent position where a cooling head coupled to a source of cooling fluid such as liquid nitrogen directs the fluid toward the surfaces of each workpiece. The cooling head engages and is sealed to the receiver to inhibit the escape of cooling fluid into the atmosphere thereby reducing cost, environmental impact, etc. A cooling program control coupled to the cooling fluid source supplies a discontinuous flow cooling fluid from said source to contact the workpieces only when the cooling head is engaged with and sealed to the receiver. A vacuum unit withdraws cooling fluid from the receiver subsequent to contact between the workpieces and the cooling fluid. The cooling fluid can then recooled and recycled for reuse.
摘要:
A method for manufacturing calendered and/or extruded semifinished products with increased surface tackiness from a mixture of rubber and rubber-like plastic materials employs a shock-cooling step for cooling the hot semifinished products at a maximum shock cooling temperature of 0.degree. C.
摘要:
A method, process and apparatus for generating complex shapes without the use of dies, molds, or other fixed tooling. A continuous length or flow of a malleable or fluent material is provided to a forming apparatus which shapes the material, producing a contiguous series of smoothly blended, properly contoured portions of the desired shape. The formation of a shape relies on continuous control of shape-determining variables: the instantaneous cross-section of the shape in a virtual transition surface between the formable and formed material, the rate-of-change of cross-sectional dimensions between sequential cross-sections, the instantaneous angle of movement of the material at any point on the cross-section in the transition surface, and the rate of movement away from the transition surface of the just-stabilized portion of the shape. The material is stabilized as these shape-determining variables achieve the proper values in each portion of the material. The invention further provides a technique for analyzing and modifying a computer model of a desired shape, and for developing a process control datafile from the models.
摘要:
A method of preheating, curing and stabilizing vehicle tires, whereby, just before being subjected to curing a first green tire (3) is preheated simultaneously with the stabilization of a second cured tire (6), thus using the heat given off by the second tire (6) as it is being stabilized.