SU876266A1 - Plant for making pairs of flaskless moulds - Google Patents

Description

(54) INSTALLATION FOR THE MANUFACTURE OF PAIR SECURE-FREE FORMS

, 1 The invention relates to foundry, in particular, to flaskless automatic molding lines with a pair assembly. Known installation containing two-position blocks. The manufacture of molds is carried out in blocks of the lower and upper half-molds by the method of free filling of the mixture, followed by upper pressing in moving molding chambers. Chambers for bottom molds are turned over, and cameras for half molds of a top reciprocate tl3, however, this complicates the lines and reduces the accuracy of the castings produced. Both lines are created on the basis of the beliefs: Tick-closed carriage conveyors carrying pallets. A vertically closed conveyor allows a significant increase in the percentage of use of the track. However, the bogie conveyor belt creates a rigid tie between the individual sections of the line and, therefore, its coefficient of technical use. The use of the upper yy: pressing limits the manufactured nomenclature of castings, and the presence of two multi-position night-type blocks complicates the design of the line and reduces the accuracy of the castings ... An analogue can also serve as a domestic line of pair-shaped flask-shaped mod. AL 28314. In that line there are two three-position molding units and two branches of a vertical-closed conveyor along which the pallets move. The closest technical solution is an installation comprising a two-stage sand-blowing press-type casting block. including a sandblasting device with a reservoir, sleeves and nozzles, injection and discharge valves, a receiver, a forward chamber, model complexes, a pressing device and a mold collector, and a horizontally closed transport device with two parallel branches to move the subdomain. new 123.. 7 From the preparation of the half-form is carried out by the method of pressing loosely poured mixture. The bottom half-molds, made in the moving chambers with the connector down, together with the chambers, are delivered to the tilter and then to the position of the rods, after which the molding chamber with the half-mold

the bottom is fed into the upper half-form block, which has a vertically movable chamber, where the upper half-forms are molded in the same way. In the top half-form block, the top half-forms are manufactured and assembled with bottom half-forms, which are extruded from the molding chambers and, together with the top half-forms, are placed on pallets, which are delivered to a double brown roller table, the lower floor of which serves to return the rods.

The installation has the following queue lack. The presence of movable molding chambers and the manufacture of half-molds in two different blocks reduces the accuracy of the manufacture of half-molds and the accuracy of the assembly of the molds, and hence the accuracy of the castings. The presence of two molding blocks with retractable mechanisms requires two independent foundations, two hydraulic and electrical interconnects, which considerably complicates the arrangement, drives and control systems of the line and increases the metal intensity of the installation. The use to form a clean upper extrusion of a free-filled mixture contributes to the formation of an uneven compaction mixture and limits the range of castings produced. Making the bottom half-form with the connector down requires the use of a turn-over device. The presence of two transport routes (for moving chambers and pallets) increases the size and complexity of the design.

The tracks of both transport devices (for moving the molding chambers and for moving the assembled forms) are used for performing technological operations by no more than 50%, which is extremely inefficient and leads to an increase in their total length. The presence of movable molding chambers, movable fresh pad, tilting molding chambers of the lower half-form and two transport systems significantly complicates the design, drive and control system of the line.

A significant drawback of the design is the inability to insert an automated change of the model kit, which limits the use of the machine to the area of mass and large-scale production. The model set of tops is located below the level of the pallets, but when assembling forg it should be removed from the press and mold assembly forms.

The purpose of the invention is to simplify the design and control system, improve the uniformity of compaction of the mixture and the accuracy of manufacturing the molds, and improve sanitary and hygienic working conditions.

The goal is achieved. For example, in an installation containing

(two-way sand-blowing press-type through-pass molding unit, which includes a sand-blowing device with a tank, sleeves and nozzles, injection and discharge valves, a receiver, a molding chamber, model components, a pressing device and (Form assembler, and a horizontally closed transport device with two parallel branches to move the pallets, the sand-blowing device is additionally equipped with sleeves and nozzles fixed on opposite sides of the molding chambers, and the walls of the chambers are made with interchangeable inserts M, and the pallets on the transport device are installed with the possibility of moving to the forming positions in different directions.

The sleeves of one sandblasting device are equipped with a common valve for injection and discharge, and both tanks are equipped with a common receiver.

FIG. 1 is a schematic of the line in FIG. 2 is a cross-section along the molding block; in fig. 3 is a longitudinal section through the molding unit at the position of manufacturing the mold half-molds and the assembly of the molds; in fig. 4 - forming block, top view.

The installation (Fig. 1) consists of one two-position forming block 1 of a through type and a horizontally closed transport device, for example, a roller table 2, pallets 3 with bottom half molds 4 and molds 5. The core installation section is located to the left of the molding block, and the sections of drinking and cooling and knockout collected forms - on the right. The first position of the block serves to manufacture the half-molds of the bottom 4 and its installation on the pallet, the second position serves to manufacture the half-mold of the upper b and its assembly with the half-mold of the lower.

The molding unit (Figures 2-4) is a six-column, two-position press with vertical wasps, which includes a top

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the yoke 7, the lower base 8 and the columns 9. Two molding chambers 10 and 11 are fixed non-movably on the yoke for making the lower and upper half-molds. Along the perimeter of the chambers there are rubber sealing cords 12. Each chamber has two guide pins 13, on which the pallets and the model set of half-shells of the top are fixed during the manufacture of the half-molds and their assembly. At the manufacturing position of the mold half-molds, there are upper 14 and lower 15 pressing cylinders. The upper hydraulic cylinder 14 carries the press plate 16 and the model set of half-molds of the bottom 17. The lower hydraulic cylinder carries the press plate 18 and the floating plate 19 with pins 20 dL. receiving pallets 3, with holes 21. At the position of manufacturing the half-molds of the top, there are upper 22 and lower 2 pressing cylinders. The upper cylinder 22 carries a pressing plate 24 with a model of a sprue crow and a counter model. The lower hydraulic cylinder 23 carries a pressing plate 25 model set of half-molds of the top 2 with openings 27. A frame 28 of the mold collector 29 is placed around the model set 26 with a floating device and pins for receiving pallets with half-bottoms. The frame of the assembler is fixed on the rods of the hydraulic cylinders 30 (Fig. 3). Sandblasting tanks 31 are fixed on the upper cross bar at both positions. Each tank has two sleeves 32, two nozzles 33, one valve of the secondary valve 34, one valve 35 of discharge and one pneumatic cylinder 36 for the drive of the slide gates 37. Both sandblow tanks are located in the receiver 38 for compressed of air. The molding mixture 39 is in the sleeves. The receiver is mounted on the upper cross bar of the press. The lower levels of the molding chambers are located on the same level for the convenience of changing the model, complex, which are supplied to the molding blocks on the right and left. For receiving and changing model sets, folding side rollers (not shown) are available at both positions. The molding chambers have inserts 40 that allow the shape, blowing hole and direction of injection to be changed relative to the model plate. The line works as follows. After pushing the mold from the pallet to the embossing (or transferring it to the other, transporting the pallet 3 gets into the manufacturing position of the bottom half-form. Plate 18 of the hydraulic cylinder 15 receives the section and presses it against the chamber 10 and the cord 12. At the same time, the pins 13 enter the holes 21 of the tray 3 and fix it. After that, the chamber is closed and ready to inject the mixture. The valve 34 is blown off, the air drawn from the receiver 38 enters the tank 31 and takes the molding mixture 39 out of two sleeves 32, after two nozzle 33 into the chamber 10. After blowing the bottom 15 and 14 hydraulic cylinders make the pressing of the mold, and after pressing the hydraulic cylinder 14 pushes the lower mold 4 out of the chamber 10. At the same time, the hydraulic cylinder 15 lowers the pallet with the half mold and installs it on the roller table 2. The half mold on the pallet enters the section of the cores and passes on the roller table 2 to the second position. At the same time, the second position is the manufacture of the mold half. At the same time, the hydraulic cylinder 23 presses the model kit 26 to the chamber 11, fixing it on the pin m 13. The mixture is blown in and repressed the hydraulic cylinder, mi 22 and 23. After that, the hydraulic cylinder 22 remains fixed, and the hydraulic cylinder 23 lowers the model kit down. Moreover, the upper half-form remains in the chamber. A next pallet comes to the semi-top manufacturing position with a half-bottom mold that stops above the lowered model kit. After that, the table of the collector 29 goes up, removes the bottom 1: n With the bottom half-form 4 and lifts it up. The pallet 3 is fixed by pins m 13, the upper cylinder 22 pushes the upper half-form and assembles it with the lower half-form, after which the pallet 3 with the assembled form 5 is lowered, installed on the roller table and fed out of the molding unit to the pouring section, where the forms are assembled into a continuous pile or transmitted to another mode of transport. Productivity of the line is 150 200 forms / hour. The line can be used for the manufacture of castings in the forms of any dimensions, however, its main advantages - the accuracy of casting, the simplicity of the design at high productivity, manifested in the manufacture of medium and large forms. The convenience and speed of changing the model sets allows the line to be used for any serial production. The proposed device has the following design advantages over all other ones designed for the manufacture of pair-wise-free and durable forms of 150–200 molds per hour, the presence of one (instead of two multi-position) two, 1-pass-through type molding block, including two fixed molding yamers , the color of sandblasting devices, united by one common receiver, two pressing devices and one collector, located at the manufacturing position of the upper half-molds. A number of mechanisms perform several process steps. Thus, the manufacture of half-molds, the pairing of the lower half-molds with the pallet, the assembly of molds, the change of model sets at both positions is carried out with the help of hydraulic cylinders of the pressing device. All movements that take place in the molding unit are designed to perform technological operations: pressing, ejecting, drawing, assembling forms. Idle passages of the hydrocyturist lawsuit: lapsed or reduced to a minimum. Such unproductive movements as reciprocating or rotator movement of the chambers are completely absent, the supply of mechanics to the place of the technological operation is the movement of the dosing of the pressure pads, ejectors; no turning of the bottom half-form.

All this leads to the fact that the place of two complex multi-position locks is one simple with a minimum of mechanisms, with a significantly lower metal intensity.

The presence of one molding unit instead of two greatly simplifies the design, the control system, the building part, and the hydraulic and electrical installation.

The forming unit is a dual installation with vertical extrusion axes. It has the following advantages of this model: fixed molding chambers, which ensures the absence of blowing the mixture through the nozzle connector — the chamber, the permanent presence of one of the plates in the chamber and pressing the second plate around the perimeter, guaranteeing the tightness of the chamber during injection, precise fixation of both plates relative to the chamber, the first is on the dimensions of the camera., the second is by pin m.

The use of double-sided injection of a mixture of two opposite nozzles, which allow using inserts to easily change the shape of the injection hole and the direction of the injection with respect to the model plate ensures uniform and high-quality compaction of the mixture with the widest range of model kits.

An almost entirely horizontally closed track movement of pallets with half-frames and molds is used to perform technological operations: core installation, mold assembly, pouring, cooling, transfer to embossing and only a minor length of track (2-3 POSITIONS) is simply to return the pallets. This provides almost 100% use of the track.

The accuracy of the manufacture of the half-molds and their assembly is ensured by the fact that the bottom half-form, pushed out of the molding chamber by the pressing model plate, is on a pallet that is fixed relative to the camera by fixed pins m. In making the upper half-form, the model set is fixed on the same fixed pins m the pallet with the bottom half-form is fixed during mold assembly.

Comparison of the line design shows that with the same performance, the proposed line has 23 times or fewer mechanisms, i.e. 2-3 times easier to manufacture, has a lower metal consumption, and provides higher accuracy in the manufacture of molds and castings, expands the range of manufactured castings

The presence of a dead end (a clear connection between the chambers and nozzles, the lack of movement of the model kits from one position to another in the mold manufacturing process ensures the tightness of the sandblasting unit when blowing, which improves the sanitary and hygienic working conditions compared to devices with moving molding chambers and model kits

Claims (2)

1. Installation for the manufacture of pair of non-flask molds containing a two-position sandblasted press-type molding unit comprising a sandblaster with a reservoir, sleeves and nozzles, injection and discharge valves, a receiver, a molding chamber, model kits, a pressing device and a mold collector and horizontally closed a transport device and a form collector, and a horizontally closed transport device with two parallel branches for moving pallets, so that, in order to simplify structures and control systems, improving the uniformity of compaction of the mixture and the accuracy of mold making and improving sanitary and hygienic working conditions, sand-blowing device is additionally equipped with sleeves and nozzles fixed from the opposite CTOjpoH molding chambers, and the walls of the chambers are made with interchangeable inserts, with the pallets on the transport device mounted so as to move to the shaping positions in different directions. 2. The installation as claimed in claim 1, in which the sleeves of one sand-blowing device are provided with a common valve for injection and discharge, and both tank reservoirs are equipped with a common receiver. I Sources of information taken into account in the examination , 1. Foundry engineering, issue 12, 1972. 2. Patent of Germany No. 2610977, cl. At 22 C 11/10, published in 1978. / ifvacmw prv - f Plot yvacmo / r oxflojffcmoHoixu, Imtxu Vr gftfu rods / Pemdaia so6ramn 1 rohn no ffpytau mflOHcport 31 a (put. I