DE2250781A1 - LOW PRESSURE CASTING MACHINE - Google Patents

Description

Soag Machinery Ltd.,

Transport Avenue,

Great West Road,

Brentfor d, Middlesex, England

Very he steps:

DIPL-IMG. MAX BUNKS

PATENT ADVOCATE

7 STUTTGART!

PO Box 1186 - LESSiNGSTR, 9 TELEPHONE 293374

p 2392

Low pressure casting machine

The invention relates to a low-pressure casting machine molten metal is passed through a riser tube which has a cap with an opening at its upper end and reaches with its lower end below the surface of the molten metal bath in the furnace pressed up. This is done by * having the surface exposes the liquid metal in the furnace to gas pressure, so that the liquid metal rises in the riser pipe

30981870732

INSPECTED

and gets into the mold where it stares /. The gas pressure will then lowered so that excess liquid metal runs back through the riser pipe back into the bath or crucible in the furnace can. Then the mold is opened and the casting taken.

It is important to use the riser cap for connecting to the Accurately align a mold or a mold carrier; Correct alignment is essential for the production of high quality castings. Up to now, the riser pipe has been fixed in place in the furnace and the entire unit has been installed using suitable lifting devices raised in relation to the molding unit or the latter lowered onto the riser pipe. Both procedures proved However, time consuming and complicated and complex powerful lifting devices that increased the manufacturing costs of the machine and rarely a really flawless one Guaranteed connection alignment between the riser pipe and the casting mold.

The invention is based on the above disadvantages to be switched off by a device by means of which the riser pipe in the vertical direction until it is connected to the Form can be raised and the furnace interior and the outer area of the riser pipe sealed against the environment can be.

Jk ' "M.'

consists . ,

The solution to this problem / according to the invention is that The following elements are combined in a low-pressure casting machine: A furnace containing molten metal, © ine over

309818/0732

the casting mold located in the furnace, a pouring funnel arranged in it, a riser pipe with an opening Cap at one end adjacent to the pouring funnel and the other end below the surface of the molten liquid Metal in the furnace, a device with which the riser pipe moves axially, its upper end to the glass

funnel in liquid-tight. Attachment / pushes and the opening the cap can be aligned to the sprue, as well as a resilient, the upper part of the riser between a Oven lid and the cap coaxially surrounding sealing device for sealing the furnace interior and the outer end of the upper Part of the riser pipe against the ambient air, with the liquid metal by applying pressure to the metal surface in the furnace through the riser pipe, the cap and the pouring funnel can be pressed through into the mold.

For a better understanding of the invention, reference is made to the accompanying drawings, which show an example of an embodiment show in schematic representation and in which Fig. 1 shows a section through the upper part of the furnace and through the casting mold, specifically in the area of the sealing bellows according to line I-I in Fig. 2,

Flg. 2 shows a section along line II-II in FIG. 1 and FIG. 5 shows a section along line III-III in FIG. 2.

As the drawing shows, the mold consists of two halves; the upper half 2 is on a movable head plate and the lower half 3 - on a stationary base plate k

309818/07 3?

strengthens; the two Formhfilften 2 and 3 form with each other the mold cavity C The shape of the mold allows it to be attached of vents 6 in the contact surfaces of the halves 2 and ■> · ■

A furnace 9 with a lid 10 becomes molten metal 8 introduced through a riser pipe 11 into the cavity 5 by means of gas pressure, the gas being fed through a valve 13

■■■ '■■. ϊ

See inlet line 12 is fed and onto the surface

14 of the molten metal in furnace 9 pushes. The lower The end of the riser pipe 11 protrudes below the surface 14 of the molten metal in the furnace 9 »while the upper end of the riser pipe 11 with a riser pipe cap having an opening 15 is provided, which is coaxial liquid-tight in operation is aligned with the sprue 7.

A flexible seal in the form of a bellows unit 16 made of heat-resistant material is also arranged between the cover 10 of the furnace 9 and a flange 17 on the riser pipe cap 15, which seals the inside of the furnace 9 and the ludder end of the upper part of the riser pipe 11 against the? AusBenluft ^ftbBchlie 9i ^: The bellows unit 16 consists of a lower flange 22 attached to the deodorant 10 and an upper flange 22 attached to the flange 17 of the riser pipe cap

15 fastened flange S3 »The string unit 16 is arranged concentrically around the riser pipe 11 and can be opened by means of a! ¹ wedge adjustment device 18 stretched or Eueammenpressressed »A stretching of the bellows creates pressure on the flange 17. As a result, the riser 11 lifts and is with the top of the riser cap 15 against

the pouring funnel 7 eedrüaktg Ja d gsjftj ψΜψοϊιβη the riser

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cap 15. and the pouring funnel a liquid-tight connection arises,

In the riser cap I.5 an inlet tube 19 is inserted · ^ .by the inert gas, which is heavier than air. In the riser 11 can be introduced. In the opening 20 of the cap 15 A nozzle 21 is attached, which looks axially below the mouth the inlet pipe. 19 extends into the riser pipe.

Vers · '' ■■ ■ - ■ ■ ■ ' ''·"■ · ■■■■ - · ■ - ■'^; V · ■ ^: " ■ - ■ ■■ · ■■ - · .. ■ · The KeI ! - / partial device 18- consists of. two trowel units 24 and 25, which are arranged laterally and preferably parallel to one another next to the bellows unit 16 on a first support plate 26.

■ ■ - ■■ '- ■ ■ 26 ■ · ■ "■■: -'' , .. ■;.;:; -; -..- ... _; -, are .. The support plate / your part 1st attached to the flange 22. ·

-Vers ^: ', ■ - ■ ·· _; '- ^r T:;,:. .- .: .-: · .-; ■.,,. -. ■ -. . The /, tellvorrlchtung interacts with stops 27: which are arranged on a second support plate 28 fastened to the flange YJ of the riser pipe cap 15. The upper plate 28 is provided with four radial recesses 29 for receiving sliding blocks 30 fastened to it by means of screw bolts 31. The lower plate 26 likewise has four, aligned with the recesses 29; radial recesses 32, which act as a guide for the sliding blocks; 30 serve. The arrangement of the recesses provided with the plates 26 and 28 and the sliding blocks 30 forming the riser 11 with the cap 15, a centering device when the tube by dle7% e 11 device 18 with the cap on the fiießtrichter is moved .. -

Each of the wedge units 24, 25 has two spaced apart in parallel webs j53 ^ arranged on edge to one another between those on one; End a wedge member 34 and at the other end; a mothers 35

is attached. A head screw 36 engages in the nut 35 and is rotatably held with its free end on a further wedge element 37, which can slide between the webs 33 "which in this way a guide for the wedge learning * 37 ^; l * ildeä; :

The wedge elements 3 ^ and 37 of each unit taper in the Direction in which they are facing each other and support the stops 27 on their inclined wedge surfaces during operation. the the two stops 27 are arranged at a fixed distance from one another and are designed as round head bolts, the collar heads of which engage between the webs 33.

When setting up the device, the cap 15 of the riser pipe 11 / ^on the pouring funnel 7 / is brought into liquid-tight contact / by moving the riser pipe 11 upwards by turning the screws 36 of the wedge units 24, 25 on both sides of the bellows unit 16. By this rotation of the wedge elements y ^ t are 37 of each wedge unit brought closer together, 'How do the associated stop pin 27 to move upwardly along the inclined surfaces of the wedge elements and to lift the riser 11 with the cap 15 in the direction of the sprue. 7 When these two parts are aligned with one another, the wedge elements 3 ^ * 37 are fixed by tightening the lock nut 38 on the screw 36.

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Claims (1)

Fa tent an s ρ r ti e H e 1. Low pressure casting machine, characterized by the union f (jgender elements ϊ A furnace (9) containing molten metal (8), a casting mold ( _{2, 3} ) located above the furnace (9), a pouring funnel (7) arranged therein, and a riser pipe (11) with a cap having an opening (20) (15) at its one end adjacent to the pouring funnel (7) and the other end of which extends below the surface (14) of the molten metal (8) in the furnace (9), a device (18) with which the riser pipe (11 ) moved axially, its upper end pressed against the pouring funnel (7) in liquid-tight contact, and the opening (20) of the cap (15) can be aligned with the pouring funnel (7), as well as a flexible, the upper part of the riser pipe (11 ) between a furnace cover (10) and the cap (15) coaxially surrounding bending device (l6) for sealing the furnace interior and the 'outer end of the upper part of the riser pipe (H) against the ambient air, the liquid metal (8) being exposed to pressure the metal surfaces (14) in the furnace (9) through the riser pipe ( 11), the cap (15) and the pouring funnel (7) can be pressed through into the casting mold (2,3). 2. Machine according to claim 1, characterized in that the sealing device (16) consists of a resilient. The bellows is made of heat-resistant material, which has a flange (22) attached to the eekel (10) at one end and a further flange (15) attached to a flange (17) on the riser cap (15) at the other end ( 23). ⁽ 5. Machine according to claim I or 2 *, characterized in that 2 2 5 0 7 ί3 1 - a - the device (l8) for the axial movement of the riser pipe (11) there are two wedge units (24,25 ^) arranged laterally around the sealing device (l6), which cooperate with stops (27), which in turn are in operative connection with the riser pipe cap (15). H. Machine according to claim, characterized in that each wedge unit (24,25 ^ has two parallel longitudinal webs (33) arranged on edge at a distance from one another, between which a wedge element (34) is fastened at one end and a nut (35) is fastened at the other end , and that a head screw (36) is screwed into this nut (35) and rotatably connected at its inner free end to a further wedge element (37) which can slide between the webs (33). 5. Machine according to claim 4, characterized in that the wedge elements (34, 37) taper in the direction in which they face one another; and the stops C27) lead on the inclined surfaces of the wedge elements (34,37) between the webs (33) . 6. Machine according to one of claims 3 to 5 *, characterized in that the stops (27) are each designed as round head bolts, which are at a distance from one another with the Rteigrohrkappe (] '}) in operative connection, annular element (Ί' τ · a ρ- ρ J a 11 e ? H) downwards 1 ■ age η. υ vim 1; · / Γ '* "? ; . c; t ε & ι I "