CN103252469A

CN103252469A - Modeling method for placing chilling block on vertical face of large casting

Info

Publication number: CN103252469A
Application number: CN2013102038653A
Authority: CN
Inventors: 吴文钤
Original assignee: ZHEJIANG JIALI WIND POWER TECHNOLOGY Co Ltd
Current assignee: ZHEJIANG JIALI WIND POWER TECHNOLOGY Co Ltd
Priority date: 2013-05-28
Filing date: 2013-05-28
Publication date: 2013-08-21

Abstract

The invention discloses a modeling method for placing a chilling block on a vertical face of a large casting, and belongs to the casting technology. In the prior art, the position where the chilling block is arranged on the vertical face cannot be kept accurate easily. Due to the fact that a permanent magnet is embedded into a vertical face of a wood former corresponding to the casting, the chilling block is firmly attracted to the permanent magnet, then the sand placing modeling process is carried out, an operator does not need to hold the chilling block in the process of modeling, and the chilling block cannot slide or move or deviate. Therefore, the sand placing modeling operation is convenient, and labor intensity of the operator is greatly reduced.

Description

Place the formative method of chill at the heavy castings facade

Technical field

The invention belongs to foundry engieering, specifically is that a kind of casting large-scale foundry goods guarantees to be placed on the formative method that chill on the foundry goods facade was not shifted, reduced labour intensity when sand is put in moulding.

Background technology

When the general big section of casting or wall thickness differ bigger foundry goods (as the nodular iron casting of large-scale wind electricity), because the cooling velocity of the iron liquid of the thick large part of foundry goods is very slow, namely from iron liquid to solidify finish required chronic, because setting time is long, make in the iron liquid graphite easily produce segregation and float, cause the casting flaw of the upper surface formation blackspot at the abundant position of foundry goods, because setting time is long, make graphite generation graphite morphology in the iron liquid, cause the casting flaw of not nodularization of foundry goods or abnormal nodularizing, because setting time is long, make this place easily produce shrinkage porosite or shrinkage cavity defect, in order to eliminate these defectives, obtain high-quality large-scale spheroidal graphite casting, when technological design, consider to increase at thick large end face place placement external chill the cooling velocity at this this place, shorten the setting time of this place's iron liquid, that is to say that iron liquid is frozen into solid soon, make the graphite of separating out in the iron liquid have little time to float to the foundry goods top layer, simultaneously have little time to produce graphite morphology again, thereby eliminate above-mentioned defective, obtain high-quality large-scale ductile iron spare, reduced percent defective, improved economic benefit, but this benefit needs just can withdraw deposit out under the condition that guarantees the chill correct position, and what therefore guarantee chill position on the foundry goods facade correctly is crucial.Therefore must place external chill at the abundant position of foundry goods, and the position must be very correct, if chill need be placed on the baseplane, then in operation, can control the correctness of its position fully, if chill is placed on the facade, then to guaranteeing this correct position of chill, prevent displacement, bigger in operational difficulty, be that chill is difficult to be fixed on the facade, often chill will glide or leave body when putting sand, does not reach technological requirement, is difficult to guarantee casting quality, at present both at home and abroad foundry enterprise does not all have good method to guarantee the correct of chill position on the foundry goods facade, becomes a global technical barrier.

Summary of the invention

The technical assignment of the technical problem to be solved in the present invention and proposition is to overcome the difficult point that prior art is difficult to guarantee chill correct position on facade, and a kind of formative method of placing chill at the heavy castings facade is provided.

For achieving the above object, the present invention is at the formative method of heavy castings facade placement chill, and it is characterized in that: the facade at the wooden model corresponding with foundry goods is inlayed permanent magnet, the chill brute force is absorbed and fixed at puts sand molding on the permanent magnet.

As the optimization technique means: with securing member described permanent magnet is fixed on the described wooden model.Described permanent magnet is sticking to be embedded on the described wooden model.The outer surface of described permanent magnet and wooden model forms and the on all four profile of foundry goods.Contact with the permanent magnet shape at position of described chill is in full accord; Further, contact with the wooden model shape at position of described chill is in full accord.

The invention has the beneficial effects as follows: by inlaying permanent magnet at the facade of the wooden model corresponding with foundry goods, the chill brute force is absorbed and fixed at puts sand molding on the permanent magnet, the personnel that need not during moulding live chill with hand rest, can downslide, displacement or leave yet, therefore it is easy to operate to put sand molding, alleviates operative employee's labour intensity greatly.

Description of drawings

Fig. 1 is the schematic diagram when utilizing the inventive method to put sand molding;

Number in the figure explanation: 1-wooden model, 2-permanent magnet, 3-chill, 4-upper mold, 5-lower mold.

The specific embodiment

The present invention will be further described below in conjunction with Figure of description.

The formative method of placing chill at the heavy castings facade of the present invention, as shown in Figure 1, it is to inlay permanent magnet 2 at the facade of the wooden model corresponding with foundry goods 1, chill 3 is absorbed and fixed at puts sand molding (Figure 1 shows that upper mold 4, lower mold 5) on the permanent magnet 2.Concrete, available securing member is fixed on permanent magnet on the wooden model, and perhaps permanent magnet is sticking is embedded on the wooden model.The outer surface of permanent magnet and wooden model forms and the on all four profile of foundry goods, constitutes the part (the corresponding foundry goods of wooden model) of wooden model.Manually polish for fear of the crude needs of cast(ing) surface, contact with the permanent magnet shape at position of chill is in full accord, and further, chill is big and when contacting with wooden model, the shape at the position that contacts with wooden model is in full accord.

The position of corresponding wooden model namely forms die cavity, and cast iron liquid can form foundry goods in the die cavity.According to the inventive method, as shown in Figure 1, this casting mold is to be made of upper mold 4, lower mold 5, and the foundry goods middle part of desire casting is abundant body, therefore on the facade of the thick middle large part of wooden model 1 setting-in permanent magnet, the chill brute force is absorbed and fixed on this permanent magnet can puts sand molding.

The inventive method, because the permanent magnet that chill is embedded on the wooden model holds firmly, so when putting sand, do not have the chill displacement or leave phenomenon, guarantee the correctness of chill position, eliminated owing to shrinkage cavity, shrinkage porosite, abnormal nodularizing, cast(ing) surface that the chill displacement produces are casting flaws such as black patches and caused foundry goods and scrap, the rate of reducing the number of rejects and seconds reduces the castings production cost, has improved economic benefit.

Through practical on large-scale wind electricity class foundry goods, phenomenon in the equal no concave-convex injustice of casting mold facade that forms, the foundry goods of casting presents not only smooth but also smooth outward appearance at its facade of putting chill, improved the surface quality of foundry goods, saved greatly because the workload that the crude needs of cast(ing) surface are manually polished.

Claims

1. place the formative method of chill at the heavy castings facade, it is characterized in that: inlay permanent magnet (2) at the facade of the wooden model corresponding with foundry goods (1), chill (3) is absorbed and fixed on the permanent magnet (2) puts sand molding.

2. the formative method at heavy castings facade placement chill according to claim 1 is characterized in that: with securing member described permanent magnet is fixed on the described wooden model.

3. according to claim 1ly place the formative method of chill at the heavy castings facade, it is characterized in that: described permanent magnet is sticking to be embedded on the described wooden model.

4. the formative method at heavy castings facade placement chill according to claim 1 is characterized in that: outer surface formation and the on all four profile of foundry goods of described permanent magnet and wooden model.

5. according to claim 1ly place the formative method of chill at the heavy castings facade, it is characterized in that: contact with the permanent magnet shape at position of described chill is in full accord.

6. according to claim 5ly place the formative method of chill at the heavy castings facade, it is characterized in that: contact with the wooden model shape at position of described chill is in full accord.