RU2290773C1 - Method for producing device for lifting static electricity from body of vehicle - Google Patents

Abstract

FIELD: machine operation technology, in particular, technology for grounding charges of static electricity from movable objects, such as vehicles.

SUBSTANCE: method for lifting static electricity from body of vehicle includes making a metallic fastening element, rigidly connecting a current-conductive element in form of metallic wire to it, affixing the fastening element with wire in transfer mold with recess, forming a shape of ribbon with prominent end of current-conductive element. Assembled transfer mold is moved to injection-molding machine with preliminarily heated plasticized polyvinylchloride, which is then poured into transfer mold under pressure and cooled down.

EFFECT: lifted static electricity, preserved shape and flexibility of product.

Description

The invention relates to techniques for operating machines, in particular, for removing static electricity charges from moving objects, such as vehicles, to the ground.

It is known that when a car moves on its body, charges of static electricity accumulate [Storoby I. and Shimord I. Static electricity in industry. M. - L., Gosenergoizdat, 1960.]. In this case, charges arise both from friction and deformation of tires on the road surface, and due to subsidence of dust charged on the varnished (painted) surfaces as a result of separation from the road.

To reduce the electrification of the body using a well-known device - antistat. It is made in the form of a strip of conductive rubber, is attached at one end to the machine body, and the other is dragged along the ground, providing a charge leak from the machine body.

A strip of conductive rubber is cut from the sheet, and then a hole is flared at one end for attachment to the machine body. This method of manufacturing a device for removing static electricity is taken as a prototype.

The disadvantage of the prototype method is the high cost of antistat associated with the use of rare earth metals in the manufacture of conductive rubber and the presence of large waste when cutting strips with an opening from a sheet of conductive rubber.

The objective of the invention is to reduce the cost of the resulting product while maintaining its consumer qualities.

This object is achieved in that in the method for producing a device for removing static electricity from the vehicle body, according to the invention, a metal fastener is manufactured, a conductive element in the form of a metal wire is rigidly attached to it, a fastener with a wire is molded in a mold with a recess forming the shape of the tape with the protruding end of the conductive element, place the assembled injection mold in an injection machine with preheated plasticized polyvinyl chloride to a temperature equal to 170-200 ° C, pour it into an injection mold under a pressure of 50-120 kg / cm ² for 10-30 s and cool to room temperature.

This method allows you to maintain the previous shape and flexibility of the product, the simplicity of the design, in which the flexible tape becomes a body, inside which is a live element. This eliminates the expensive material for the manufacture of flexible tape and use cheap plasticized polyvinyl chloride.

The method is implemented as follows. Strips are made from a galvanized iron sheet 0.55 mm thick, from which fasteners are cut down. Then, mounting holes are cut down on the mounting element: one for mounting on the machine body, the other for connecting to a conductive element - metal wire made of spring steel with a diameter of 0.25-0.33 mm. To reliably connect the metal wire, it is first passed through the hole, twisted, and then the joint is sealed. The fastening element is fixed with a wire in the injection mold with a recess forming the shape of a tape with the protruding end of the conductive element and the injection mold is assembled. The prepared injection mold is placed in a P-63 type injection molding machine preheated to 170-200 ° C, loaded with granulated polyvinyl chloride plasticized grade OM40 or PL2. Start the injection molding process. During the casting process, the chamber with the heated material at a pressure of 50-120 kg / cm ^{2 is} lowered onto the injection mold, the conical tip of the chamber is in close contact with the conical loading opening of the injection mold and the heated material completely fills the mold cavity. Carries out holding molding under pressure for 10-30 s, depending on the temperature of the heating material. Then they reduce the pressure from the injection machine, the chamber with the material returns to its original state. The mold with the molded product is removed from the machine and cooled to room temperature.

The mold is disassembled and the product is taken out of it, the flash is removed and decorative elements are applied.

The manufacturing cycle of the product is repeated. Material is loaded into the chamber in the required amount after each casting.

The ranges of heating time, pressure values and process holding time are selected from the following considerations. At temperatures less than 170 ° C, the material does not acquire the necessary fluidity and does not completely fill the mold. At temperatures above 200 ° C, the material polymerizes and loses its plasticity properties. At a pressure of less than 50 kg / cm ^{2 the} material does not form. Pressure greater than 120 kg / cm ² impractical, since there is a large load of the injection molding machine, the wear of the injection mold increases. When the exposure time is less than 10 s, residual stresses remain in the product leading to deformation of the product. An exposure time of more than 30 s is impractical, since it does not affect the parameters of the product and lengthens the process.

This method allows, in comparison with the known prototype, to reduce the cost of the product due to the exclusion of expensive materials in the manufacture and reduction of waste material, as well as to maintain consumer qualities of the product: removal of static electricity, maintaining the shape and flexibility of the product.

Claims (1)

A method of obtaining a device for removing static electricity from a vehicle body, characterized in that a metal fastener is manufactured, a conductive element in the form of a metal wire is rigidly attached to it, a fastening element with a wire in injection mold with a recess forming the shape of a tape with a protruding end of the conductive is fixed element, place the assembled injection mold in an injection molding machine with preheated plasticized polyvinyl chloride to a temperature equal to 170-200 ° C, it is poured into a mold under a pressure of 50-120 kg / cm ² for 10-30 seconds, and cooled to room temperature.