SU1155352A1 - Method of manufacturing moulds - Google Patents

Abstract

THE METHOD OF MANUFACTURING THE PRESSFORM is mainly for obtaining models of impellers with helical blades, including cutting a cylindrical billet into inserts with recesses on their side surfaces equal to the half-profile of the screw blade, the subsequent assembly of the inserts into the cage with contact inserts for lock screws, which is different, the assembly of the inserts into the cage with contact inserts for lock screws is different. , in order to increase labor productivity and ensure the possibility of obtaining remanufactured inserts, before cutting the workpiece, screw grooves with angular a pitch between the protrusions equal to twice the angular pitch between the blades, the groove between the protrusions of each is equal to the angular pitch between the blades, and then the workpiece is cut into equal parts with a length equal to the impeller blade and the diameter of the hub is made. Pui 1

Description

The invention relates to foundry, in particular to the production of casting in 5 / eight models, primarily for producing screws with screw blades, and can be used in various fields of engineering. The purpose of the invention is to increase labor productivity and provide the possibility of obtaining interchangeable inserts of molds due to the fabrication of inserts that form the mold cavity forging-1Y when assembling, which then produces a melted model with helical surfaces. The invention is invented by the example of making a mold to obtain a six-way model of an impeller with helical blades. FIG. 1 image .. billet with three screw grooves made on it | in FIG. 2, section A-A in FIG. 1 (rotated); in fig. 3 - cylinder -: pka preparation of three screws; -. grooves, cut into two equal parts with a cut-out center hole); in fig. 4 section bb in fig „3 (rotated); in fig. 5 - the mold assembly, a general view in section; in figo b - section bb in fig. 5 | Fig 7 is a model of the impeller; In the mold of FIG. five; on .fig. 8 - the same view from the left end of FIG. 7; in fig. 9 shows a section of a propeller blade of an impeller in the normal section of thickness. A method for manufacturing a specimen of the invention includes a follow-up operation. The first operation (Figs. 1 and 2) (grain fra) consists of cutting into shchindric aluminum billet of a chiseled groove. At the same time, ui-yyrch-free preparatory 1 / length multiple to the impeller length and with a cut allowance is placed behind the technological protrusion 2 into the dividing head of the vertical-grain machine, fixed and centered from the opposite end along the center, and then profile two hundred. using a foam cutter (or two profile cutters), three screw grooves 3 are cut to form screw tabs 4, on the side surfaces of which there are elements of inserts on the back of projections 5 and recesses b. equal to the half-section of the blade krypchatka. The helical grooves are cut with an angular pitch between the locking protrusions equal to twice the angular pitch c / h between the blades of the impeller, and the angle between the protrusions of each groove is equal to the angular pitch between the blades. Cutting the helical grooves on the workpiece is performed by successively turning it in the dividing head machine on the angular step, also equal to twice the value of the angular step oL between the blades of the impeller. The side surface of the castle arms is bounded on one side by the billet dial C and with a diameter cf equal to the diameter of the ratchet. Depth 6 in the section, perpendicular to the axis of the workpiece, is equal to the half-thickness - the blades of the impeller in the same section. The second and third operations (Figures 1-3) (turning) consist of cutting the billet into equal parts with a length equal to the length of the blade of the ratchet and cutting a central hole 7 in each billet with a diameter equal to the diameter of the hub of the blade prior to separating the screw projections 4. After cutting The diameter of the hub in each billet will receive six screw inserts 8. The fourth operation (locksmith) is to remove the burrs on the received liners. The first step (Fig. 5 and b) (assembly) consists of assembling the inserts o. At the same time, six identical liners 8 are interconnected, mating along the locking projections and placed in a cylindrical holder 9 (cup), which are closed on both sides with covers 10 and 11, in one of which a hole 12 is filled to fill the model composition. The joints are connected between themselves with fasteners (bolts) 13. After the mold is assembled through the hole 12, the model composition is filled and pressed into the mold 14. After the composition has been zapped, the mold is disassembled, the liner is removed from the holder, the LIT.NIKOVYY system is cut off (profit) 15 and then vygayam31155352 .4

the model of the impeller 16 and the separation of the krychatka and compared with the insertion from the model (Fig. 7-9). this type provides the opportunity

The complexity of manufacturing the proposed interchangeable screw die is reduced by a factor of 2.5 and the impeller production is 3.5 times depending on KOHCTDVK-5 (runoff) with straight blades.

bv

5 8

Fig 6

Ft.9

Claims (1)

METHOD FOR PRODUCING PRESSFORM mainly for obtaining models of impellers with helical lo. patches, including cutting cylinders. blanks for inserts with recesses on their lateral surfaces equal to the half-profile of a screw blade, the subsequent assembly of inserts into a holder with the contact of the inserts along the locking protrusions, characterized in that, in order to increase labor productivity and provide the possibility of obtaining interchangeable inserts, before cutting the workpiece into inserts screw grooves are cut on it with an angular pitch between the protrusions equal to twice the angular pitch between the blades, and the angle between the protrusions of each pa ^ a is equal to the angle step between the blades, and then the workpiece is cut into equal parts with a length equal to the length of the impeller blade, and the diameter of the step is cut ί