CN104271288A

CN104271288A - Casting process and mould

Info

Publication number: CN104271288A
Application number: CN201380022396.3A
Authority: CN
Inventors: 塞莉斯泰因·欧步娜; 雅克·居易翁; 托马斯·胡茨勒
Original assignee: Federal Mogul Nuernberg GmbH
Current assignee: Federal Mogul Nuernberg GmbH
Priority date: 2012-04-27
Filing date: 2013-04-26
Publication date: 2015-01-07
Anticipated expiration: 2033-04-26
Also published as: WO2013160447A3; WO2013160447A2; EP2841223B1; ES2678621T3; DE102012207090A1; MX2014013032A; EP2841223A2; CN104271288B; IN2014KN02342A; BR112014026793B1; PL2841223T3; BR112014026793A2; US20150122448A1; HUE037819T2; MX364761B

Abstract

In a process for casting a piston (10) for an internal combustion engine, the mould portions which define the casting cavity are tilted through at least 45 degrees about a horizontal axis after filling and before solidification in such a manner that the axis of rotation (A) of the component (10) moves in the direction of the vertical. What is further disclosed is a casting mould for casting a piston (10) for an internal combustion engine, in which the mould portions which define the casting cavity are tiltable through at least 45 degrees about a horizontal axis after filling and before solidification in such a manner that the axis of rotation (A) of the piston (10) moves in the direction of the vertical.

Description

Casting method and casting mould

Technical field

The present invention relates to the method for casting piston for IC engine and corresponding casting mould.

The horizontal casting for cast rotating symmetrical parts and vertical casting method are known, the piston of described parts such as internal combustion engine.In horizontal casting procedures, the rotating shaft of the parts that cast is aligned to the level of being substantially.This method is nowadays main to be used in the manufacture of diesel engine piston, and its major part uses insert to cast, such as ring support and the salt core for cooling duct afterwards.The vertical casting method of more uses casts petrolic piston, does not cast insert in its major part.

Background technology

For vertical casting method, the example used before known allows to tilt up to the machine of 30 ° of ground castings relative to vertical position.

In casting method disclosed in DE 10 2,006 058 145 A1, introduce material according to lower casting principle, and according to direct casting principle solidification material.CH 135526 A relates to a kind of method for casting composite material block and mould, and wherein the obliquity of this mould is change in casting process.

Summary of the invention

The present invention is based on following object: provide a kind of casting method and corresponding mould, wherein the method is improved relative to known method, and at least in conjunction with at least part of advantage of horizontal casting procedures and vertical casting method.

This object is realized by method according to claim 1 on the one hand.

According to this claim, after filling die cavity or at least at the end of this process is close, and before curing, the mould part defining die cavity rotates around horizontal axis or tilts at least 45 °, so that the rotating shaft of the piston that will cast moves up in the side of vertical position, and be preferably at least drawn near it.Therefore basic concept of the present invention is, substantially on the position of roughly " level " of die cavity, fills this die cavity.This provide particularly advantageous fill conditions, because compared to vertical casting, the region of the relative thin that such as, remaining wall thickness between the passage cooled after a while and ring support of piston is such can be filled better.And, when filling under level, represent the foreign particle of the impurity in cast component, such as oxide or alfin sediment, advantageously imported in the region of workpiece, and can be removed by minimum paying subsequently, or can be processed under any condition and thus removing.

Present invention utilizes the advantage of vertically casting, therefore feed action here can be carried out better.This is because cast rotational symmetric parts substantially, its die cavity is filled by the dispenser of horizontal casting procedures through being positioned at side substantially.According to the present invention, towards in the acclivitous process in side of vertical casting method, employ the feed action symmetrical substantially of center dispenser advantageously.Particularly, it is expected to, owing to improving feed, reduce the porosity of cast component.

According to the present invention, it is very important that die cavity tilts on the whole, to change the alignment of the rotating shaft of the parts that will cast as described above.In apparatus and method known in the prior art, close on die cavity but the single mould part that do not limited on the whole can rotate, therefore itself and method according to the present invention do not have comparativity.

This mold integral can be described as die cavity.

Favourable embodiment according to method of the present invention is described in the dependent claims.

In order to affect this behavior of the material will filled or be filled in die cavity in favourable and accurate especially mode, preferably can tilting action be set, in other words, the position of the rotating shaft of parts in filling process can be arranged on, and/or the angle of inclination of parts in process of setting and/or the position of rotating shaft.By arranging angle of inclination neatly, can advantageously affect filling behavior respectively and/or solidify behavior.

In order to utilize the advantage of horizontal casting procedures and existing experience in comprehensive especially mode, at present preferably, in the filling process the rotating shaft of the piston that will be cast is aligned to general horizontal.

In order to same object, preferably: the rotating shaft of the piston that will be cast in process of setting is aligned to it vertically.

In order to utilize the advantage of horizontal casting procedures, fill the lateral region preferably fluent material being filled into the piston that will be cast in die cavity process.In other words, cast gate is positioned at the lateral region of the die cavity will filled by horizontal casting procedures and preferably closes on 1/3rd lower places.

About casting mould according to the present invention, if this die cavity has at least one recess, be then favourable, when using horizontal casting procedures, this recess is positioned at the upper area of die cavity, is preferably located in the highest region.Like this, once fill complete, define a kind of dirt bag in this region, any impurity is rushed to wherein.

By dispenser being placed on upper area after inclination die cavity, particularly placing it in the place different from cast gate, the advantage of vertical casting method can be utilized in comprehensive especially mode.

As mentioned above, the advantage according to method of the present invention can be recognized in this case especially, namely, when using at least one insert to cast the parts that will cast, described insert is such as the ring support of piston for IC engine and/or the core of cooling duct.But, more easily, therefore it is further preferred that when the member align that will cast becomes level, put into insert, in specific applications, preferably use vertical casting method to put into insert, and inclined mould subsequently, and use horizontal casting procedures to fill die cavity.

Can also obtain above-mentioned purpose by casting mould according to claim 8, use this mould, foregoing method and its advantage are able to implement with device.Substantially consistent with above-mentioned preferred method according to the preferred embodiment of casting mould of the present invention.And it is worth mentioning that methodical single feature described herein can be applied in device, vice versa.

Accompanying drawing explanation

This figure graphically illustrate casting piston for IC engine time according to method of the present invention.

Detailed description of the invention

As shown in the figure, under the help of the illustrated piston for IC engine 10 that will cast clearly, process in accordance with the present invention is described, but clearly, the die cavity receiving piston is after a while starting most to be empty, and it assigns to limit and surround by not shown suitable mold.As shown in the figure, the rotating shaft A of the piston that will produce is at its initial position, that is, it is aligned to level haply when filling die cavity.Can see that piston pin hole 12 closes on the center of piston.In addition, in the example in the figures, provide dispenser 16 at end regions, and dispenser 16 is in top after inclination (right hand portion with reference to this figure).In the filling process, this dispenser is positioned at the side of workpiece, but after end-of-fill and in the solidifying of workpiece, it is positioned at the peak of workpiece.The cast gate that in figure 14 indicates is positioned at sidepiece in the filling process of die cavity, namely according to " front " of the die cavity shown in figure.Cast gate 14 is preferably arranged on the position different with dispenser 16, and it is preferably arranged to separate with dispenser.In casting process, at the peak place of die cavity, preferably recess 18 is set in die cavity, which form a kind of dirt bag that impurity can be poured wherein.These impurity can remove simply in follow-up processing.Recess 18 can be arranged on any position of the rotating shaft A along piston 10.

Make use of the symmetry of the piston 10 that will produce in process of setting, therefore as shown in right-hand area in figure, after the material that will melt is filled, the die cavity of the piston that defines subsequently is tilted, so that the rotating shaft of the parts that will manufacture is aligned to general vertical.In the illustrated embodiment in which, dispenser 16 is positioned at upper area in this state.Under such alignment, it is expected to, curing condition can cause the parts produced to have premium properties.Such as, owing to filling on horizontal level, find the such as foreign particle such as oxide and alfin sediment at the fringe region of piston, easily can remove these particles herein, instead of found foreign particle at the bottom section of piston as desired when vertical position is filled.Therefore this bottom section can be provided to be used as the bottom section cast with the end of corresponding profile according to the method in the present invention, it does not need further processing.

Claims

1. one kind for casting the method for piston for IC engine (10), tilt at least 45 °, so that the rotating shaft (A) of parts (10) moves up in the side of vertical position around horizontal axis before the mould part that therein defining die cavity solidifies after filling.

2. method according to claim 1, is characterized in that, can arrange angle of inclination.

3. method according to claim 1 and 2, is characterized in that, the described rotating shaft (A) of described piston (10) is aligned to general horizontal in the filling process.

4. the method according to any one of the claims, is characterized in that, described in process of setting, the described rotating shaft (A) of piston (10) is aligned to general vertical.

5. the method according to any one of the claims, is characterized in that, founding materials is filled in the lateral region of described piston (10).

6. the method according to any one of the claims, is characterized in that, after the described mould part of inclination, dispenser (16) is arranged on the upper area of described piston (10).

7. the method according to any one of the claims, is characterized in that, at least one insert, the core being such as used for cooling duct and/or ring support is cast in described piston (10).

8. one kind for casting the casting mould of piston for IC engine (10), it is characterized in that, can tilt at least 45 °, so that the rotating shaft (A) of piston (10) moves up in the side of vertical position around horizontal axis before the mould part defining die cavity solidifies after filling.

9. casting mould according to claim 8, is characterized in that, can arrange angle of inclination.

10. casting mould according to claim 8 or claim 9, it is characterized in that, dispenser is arranged on the rotating shaft (A) along piston (10) and is positioned at the region of the end of piston (10).

Casting mould according to any one of 11. according to Claim 8 to 10, is characterized in that, can tilt to define the described mould part of described die cavity, so that dispenser (16) is placed in upper area after tilting.

Casting mould according to any one of 12. according to Claim 8 to 11, it is characterized in that, described die cavity has at least one recess (18), when the rotating shaft of the described piston (10) that will cast is aligned to level, described recess (18) is positioned at upper area, is preferably placed on one of them peak.