DE1204781B - Device for producing molded parts by centrifugal casting - Google Patents

Description

FEDERAL REPUBLIC OF GERMANY

GERMAN

PATENT OFFICE

EDITORIAL

Int. CL:

B22d

• -f κι

/ y

German Kl .: 31 c - 18/02

Number: 1204781 ί, Κ;.,

File number: Sch 25796 VI a / 31 c

Filing date: March 28, 1959

Opening day: November 11, 1965

In the centrifugal casting process, molded parts - predominantly as rotating bodies - are made through Pouring liquid material into a rotating mold under the action of centrifugal force manufactured. The casting process takes place at the high speed of the inflowing Metal.

The casting material is filled into the molds under pressure by centrifugal force and thereby compacted, existing impurities and gases of the melt are specifically lighter components precipitated on the inner surface, creating fine-grained castings with increased strength and greater density.

Since the molds are filled under pressure, sharp and clean castings can be achieved, which match in the desired dimensions with only small tolerances.

After setting the axis of rotation of the centrifugal machine, horizontal and vertical centrifugal casting is carried out differentiated. The vertical centrifugal axis is mostly used for casting Moldings in use, while the horizontal axis is more the tubular castings with a larger length than diameter is accrued, these also predominantly smooth inner bores exhibit.

When working vertically, however, a higher centrifugal pressure has to be overcome to fling the gravity with rising metal in the mold, which is why mostly with a higher speed than must be worked with the horizontal method.

A sufficient amount of material to fill the revolving mold is poured into a feed vessel, Pan, crucible or the like. Filled into this.

The following materials can be considered for the centrifugal casting process, for example: The cast alloys of steel and cast iron, of copper, bronze, gunmetal, brass and special brass, of nickel and aluminum bronzes, from Monel metal, from magnesium and aluminum - especially SiIumin -, of zinc and lead, the nickel-chromium-cobalt, the chromium-nickel-molybdenum and the Titanium alloys.

In centrifugal casting, according to the current state of the art, cast parts are completely formed Molds made. The axis of rotation is usually within the shape of the casting, in special cases it can also lie outside the mold cavities.

The centrifugal cast parts are either in

Device for producing molded parts
by centrifugal casting

Applicant:

Dipl.-Ing. Peter Schmidthuysen,
Klaus Schmidthuysen,
Düsseldorf-Oberkassel, Steffenstr. 34

Named as inventor:

Dipl.-Ing. Peter Schmidthuysen,

Klaus Schmidthuysen, Düsseldorf-Oberkassel - -

known chill-metal molds or profile parts with undercuts or undercuts or recesses through core parts inserted into the molds produced, possibly resulting in multiple divided forms, so that for profiled parts known sand-lined forms come into use.

In the mostly two-part centrifugal casting molds with a vertical axis of rotation, the bottom half is the Lower part mold firmly connected to the centrifugal machine table top, while the cover half or Upper part mold is designed to be removable for retrieving the cast parts.

To fill in the liquid casting material you can see either one with the lid half fixed connected funnel or one chooses one in the mold through a for larger mold heights Opening of the upper part protruding loose funnel with possibly angled end piece. In both In some embodiments, an undesirable turbulence results when it hits the bottom of the mold,

d. H. Vortex formation of the casting material with cavitation phenomena, which lead to the formation of cavities and simultaneous destruction of the surrounding floor parts. During the casting process Inflowing air also has the possibility of oxidizing the liquid casting material, namely by the stronger the greater the turbulence.

In a known centrifugal casting mold, the liquid metal is poured into a sprue provided with ribs introduced, which is driven at a greater angular speed than the mold, whereby the casting material is given an increased acceleration. The separation of the pouring from

509 737/290

Claims (1)

3 4 but the form has the major disadvantage that this gene, preferably four to six or more air is also sucked in through the separating joints, ribs 6, whereby a flow-favorable and the liquid material can itself oxidize. division of the casting material and its special If the wall thickness is not uniform, a strong centrifugal effect is achieved. The one below kenpartien on the molded part can also be dangerous for the 5 of the mold upper parts 1 arranged Occurrence of blowholes in the stronger spirally running, kidney-conveyed in the examples Lots exist, if not the possibility of moderate warts or elevations 7 are in the same Suction from a correspondingly arranged number spatially between the ribs 6 and under- known supply, equalizing or Sam- once support the flow-favorable inlet of the mel room is given. io casting metal, on the other hand they result in the Likewise, any difficulties that arise, such as a narrowing of the cross-section within the nodes, can be identified a constant filling quantity for the kille. By damming or throttling the flüs centrifugal cast part not easy to master, as the sigen material acts the novel mold device previous Chill molds only compensate for undesired oxidation by avoiding changes in wall thickness with oversize or undersize for an additional air intake into the mold permit. opposite. To the entire inflow process of the liquid The insert pieces 2 d in Fig. 3 are only after Casting material in the centrifugal mold is essential to the lifting of the casting from the mold improve, the invention is retractable inside for manufacturing. The carrier that is detachable in the mold part 2 of molded parts by centrifugal casting the task 20 gerkokillenstück 2e in Fig. 4 takes both the based on the aforementioned lack of mold tip 2 c as well as the sand core 11 for the to eliminate. Hub recess on. For this purpose, the inventive As centrifugal cast parts 3 are in Fig. 1 a mold device made of a spur gear body in the pouring-in, in Fig. 3 six brake pads as segments of an upper part, a ring shape broken in comparison to the pouring funnel, and in FIG. 4 the hub part leaves a narrower passage to the mold cavity free, a larger wheel disc
whose cross-section represents a corrugated ring. In FIGS. 1 to 4, the material flow is shown in the annular collecting spaces 4 in the mold cavity with a flow-restricting comparison annular subsequent quantity distribution with simultaneous cross-sectional constriction at the same time to pass over to approximately fluctuating, guided, being able to merge with the lower part of the mold, which is bulged concentrically below the one, ie uneven metal infusion funnel. alternating ribs are arranged in depressions, 35 In Figs. 1 to 3, the movable between the arranged on the upper part of the mold, the thrower 8 for lifting the solidified castings Cross-section of constricting warts or elevations after the end of the spinning process. The loading log in. The movable core mandrel 10 is shown in FIG. 3 for a drill According to a further idea of the invention, tion is provided in the flap of the brake pad,
In FIGS. 3a and 4a, the cucumber conveyors running counter to the direction of rotation are arranged in a spiral and 4 associated with FIG. 3 in the inlet counter to the direction of rotation. A valuable addition to the ingeniously curved rib arrangements 6 on the device according to the invention is to add the lower part 2c of the mold as a left or upper plan view if inside the mold in front of the actual mold cavity, which is also curved in a spiral shape, concentric to the axis of rotation Kidney-shaped projections 7 is provided below the ordered, per se known, annular collecting top mold part 1 as a right or middle lower space and volume equalization space. sees with lying in different planes, Several exemplary embodiments of mold sections shown in dashed lines. directions according to the invention are shown in Fig. 1. The devices according to the invention are not intended 2, 3 and 4 each with a half vertical partial section 50 on the illustrated and described execution represented by different mold shapes, currency examples are limited, since without a disclaimer rend the F i g. 3 a and 4 a top views of ribs deviation from the inventive concept multiple deviations or wart-shaped elevations within the co- changes of the mold parts according to the respective show killer shapes. ! igen molded parts are possible. In the F i g. 1 to 4 are the removable Kokil- 55
lenoberteile 1 with their central cast-in triohtern la each above the annular mold sub-claims:
parts 2 arranged, which are firmly connected to the centrifugal machine table top 9. Parts 2a and 1. Device for producing molded part 2b form as further mold ring pieces in 60 len by centrifugal casting in two or more-part pieces rotating with vertical Fig. 1 or laterally removable mold segment rotation axis in FIGS. 2 and 3, the mold outer walls Chill molds, characterized by and are firmly or detachably connected to the lower parts 2 with a bulging in the pouring funnel (la). Mold lower part (2 c), which goes to the mold upper part The central, with the parts 2 firmly connected 65 (1) a compared to the pouring funnel (la) Mold lower parts 20 c have the contrary to the turning narrower passage to the mold cavity leaves free, radially curved in the direction of the central axis, the cross-section of which is a corrugated ring ralig running, in the examples cucumber-shaped. 2. Apparatus according to claim 1, characterized by spirally counter to the direction of rotation running ribs (6) and recesses in the inlet. 3. Apparatus according to claim 1 or 2, characterized by a concentric to Axis of rotation arranged annular collecting space (4) and volume equalization space (5) in front of the Mold cavity. Documents considered: German Patent Specifications Nos. 489 383, 587 116; French Patent No. 992 113; U.S. Patent Nos. 2,638,646, 2,618,031. For this purpose 2 sheets of drawings 509 737/290 11.65 © Bundesdruckerei Berlin