SU1739069A1 - Method for manufacture of working members of hydraulic machine - Google Patents

Abstract

The invention relates to hydraulic engineering and can be used in the manufacture of working bodies of hydraulic machines. The purpose of the invention is the expansion of technological capabilities, improving the reliability and productivity of manufacturing. Blades 6 are made separately (by precision casting, stamping) together with iconic protrusions. On these projections, the blades are installed in a mold containing interchangeable inserts 3 and 4, made in the form of disks of working bodies and having corresponding sign grooves. Between the inserts 3 and 4, a molding composition 9 is pressed in, which fixes the blades in a fixed position and occupies the inter-invention. It relates to hydraulic engineering and can be used in the manufacture of hydraulic tools. The purpose of the invention is the expansion of technological capabilities, increased reliability and productivity of production. FIG. 1 shows a mold for the implementation of the proposed method, top view; in fig. 2 shows section A-A in FIG. one; in fig. Figures 3 and 4 show the blades in a schematic and element-wise manner, their installation, the variant of the disk and inter-blade space of the working body. After the molding composition hardens, together with the blades, it is removed from the mold, from which the interchangeable inserts 3 and 4 are also removed. blades to form one-piece joints. After the forming mass forming the disks, the working body, together with the forming composition remaining between the disks and the blades, is removed from the mold, and then the forming composition is removed by leaching, smelting or destruction. To improve the quality of the surfaces of the flow parts of the discs and to the need to protect the moldable composition 9 against the effects of the press-down forming mass forming the disks, m. thin-walled protective discs are used, which are installed between the blades and inserts 3 and 4 before pressing in the molding mold 9 to be removed. 2 Cp. f-ly, 7 ill. nor blade with disks: in fig. 5-7 - part of the impeller connecting the blades on different parts of the disks. The mold for the implementation of the proposed method of manufacturing the working bodies contains coaxial supports 1 and 2, removable inserts 3 and 4, corresponding in shape to the disks 5 and 6, obtained after molding. The inserts have sign grooves for mounting and positioning them along the slots of 7 blades 8. The interdisk zone 9 is shown conventionally in the form of a molding material. Supports 1 and 2 (Л С V4 CJ О О О Ю

Description

are fixed with hinged bolts 10 and nuts 11. The bolt 10 is fixed rotatably and rotatably around pin 12. Support legs 1 and 2 have holes 13 and 14 and feed slots 15. Positions 16 and 17 conventionally show protective discs installed between inserts 3 and 4 and blades.

The proposed method is carried out as follows.

The blades are made separately by machining, stamping, pressing in a separate mold. Inserts 3 and 4 are installed in supports 1 and 2 with the exact mutual arrangement of the sign grooves 7 on both inserts. All the blades 8 are mounted on these sign grooves and the supports 1 and 2 are connected. After that, the mold is turned 180 ° and the molding material is poured or pressed through the hole 13. In this case, in the feeding grooves 15, removable plates corresponding in shape are installed (not shown in FIG.). After the molding composition hardens, the mold is disassembled, the support 2 is removed first, then the molding composition is removed together with the paddles, and then the inserts 3 and 4 are removed from the supports 1 and 2 and the paddles 8 are set to support 2, removable plates that cover the feeding grooves 15 are removed from support 1 and the supports are joined. The molding mass from which the discs are molded is pressed into the hole 14. To the disk 6, the molding mass enters through the nutrient grooves 15 (during injection molding). With free pouring, it is possible to alternately form the upper and lower discs.

In cases when it is necessary to improve the quality of the internal surfaces of the discs or when the integrity and quality of the surfaces of the molding composition may deteriorate when in contact with a compressible composition, for example, hot plastic under pressure, it is possible to use protective thin-walled disks 16 and 17, which are made separately with corresponding slots. in the locations of the iconic projections of the blades. Protective discs are installed between the blades 8 and the inserts 3, 4 before pressing the molding compound into the interdisk zone. The discs can be made by stamping from thin-sheet material, for example steel or brass, or from plastic by injection molding. It is possible to use a more wear-resistant and durable plastic than that used to form the disks 5 and 6.

The use of the invention will make it possible to manufacture working bodies of hydraulic machines consisting of blades and discs made of various materials, for example

plastic discs and metal blades, or blades made of high strength filled plastic. Pressing both of them at the same time improves productivity and precision.

It is possible to wash the molding composition in running water without the cost of manual labor. When using heat-resistant plastics that do not lose their properties and

configurations at elevated temperatures, it is possible to use melted core compositions of low-melting metal alloys, such as, for example, Wood's alloy. Such an alloy may be melted from a plastic working body in hot glycerin. Ceramic materials that are mechanically destructible can also be used as a removable molding composition.

Claims (3)

1. A method of manufacturing hydraulic machines, including the manufacture and assembly of blades and discs in molds, made with account of the shrinkage dimensions of parts, characterized in that, in order to expand technological capabilities, increase reliability and productivity, during assembly into a mold, circular disk inserts with sign grooves, and the blades are made with iconic protrusions, set them in the area between inserts in the corresponding grooves of the latter and fill the specified zone with destructible forming material, then the mold is disassembled to remove the inserts, the mold is assembled and the disks are formed, forming a permanent connection with the blades, the mold is again disassembled to remove the finished product , then the molding composition is removed from the product. 2. The method according to claim 1, wherein the fact that the blades are made of more durable and wear-resistant materials than the material of the disks. 3. The method according to claim 1, wherein In order to improve the quality of the internal surfaces of the discs, thin-walled protective discs are made separately and placed between the vanes and inserts before pressing the molding compound into the zone between the inserts. R eight Lg./ Rig 2 BUT  ./J Rig.Z Rig. five Fig.C 6