CN212884925U

CN212884925U - Indirect external chill of large casting

Info

Publication number: CN212884925U
Application number: CN202021832215.7U
Authority: CN
Inventors: 张龙; 陈新军; 陈强; 陈为雷; 毛建忠
Original assignee: Chinalco Shandong Engineering Technology Co ltd
Current assignee: Chinalco Shandong Engineering Technology Co ltd
Priority date: 2020-08-28
Filing date: 2020-08-28
Publication date: 2021-04-06
Anticipated expiration: 2030-08-28

Abstract

An indirect external chill for a large casting belongs to the technical field of casting treatment. The method is characterized in that: including a plurality of outer cold iron plate (2), the contact surface of outer cold iron plate (2) terminal surface for being used for hanging the sand, the edge of outer cold iron plate (2) is equipped with the structure of piecing together, and a plurality of outer cold iron plate (2) concatenations form the chiller subassembly, and outer cold iron plate (2) are outside through piecing together structure joint modular construction. The utility model provides a small-size outer chill hang the very poor problem of sand effect, large-scale indirect outer chill adopts small-size outer chill combination formula preparation and using-way, adopts the outside structure joint forming mechanism of piecing together of outer chill piece, forms indirect outer chill and models along with the type preparation, with the foundry goods model together. As a part of the sand mould, even a sand mould is formed, and the thickness of the sand hanging layer is uniform; the operability of the external chill is improved, the production efficiency is improved, the cost of the external chill is reduced, and the cost of castings is reduced.

Description

Indirect external chill of large casting

Technical Field

An indirect external chill for a large casting belongs to the technical field of casting treatment.

Background

The thermal junction is an effect generated in the casting process, and the casting thermal junction refers to a node or a local area in a casting, which is slower to solidify than surrounding metal in the casting in the solidification process of the casting. It can also be said that the cooling is finally solidified. In particular, large castings tend to be complex in structure and have a plurality of local thermal junctions. In order to eliminate the hot spot, it is now common to arrange a chiller at the hot spot to increase the cooling rate and achieve the reduction and elimination of the local hot spot.

In the prior art, the small-sized external chill has the problems of poor sand hanging effect, poor adhesion, easy falling off and the like. When the heat joint is small, a direct external chill with small volume is generally used at the corresponding part to eliminate the local heat joint. If the heat is more, apart from hour, use a plurality of less direct external chills of volume, but this kind of mode can influence each other, produces very big stress easily between the chills. If a direct external chill with large size is used, the chilling is too large, and the casting is easy to crack. The indirect external chill with a sand coating is usually adopted, so that the defects of cracks, wrinkles and the like are avoided, and the quality of castings is improved. The sand hanging operation is complex due to the limitation and influence of other tools and patterns. Even some parts are too complicated, form the dead angle, can't tamp, only can take out carefully to mend after the model.

Because the size of the external chill of the large casting is large, the external chill is heated, the temperature difference of each part is large during cooling, great stress is generated, and the external chill is deformed quickly to generate cracks to lose efficacy. The external chill has heavy weight, large volume, high manufacturing cost and difficult hoisting, transferring and storing.

Disclosure of Invention

The utility model discloses the technical problem that will solve is: the defects of the prior art are overcome, and the indirect external chill of the large casting, which solves the problem of poor sand hanging effect of the small external chill, improves the operability of the external chill, improves the production efficiency, reduces the cost of the external chill and reduces the cost of the casting, is provided.

The utility model provides a technical scheme that its technical problem adopted is: the indirect external chilling block for the large casting is characterized in that: including a plurality of outer cold iron pieces, a contact surface for being used for hanging sand of outer cold iron piece terminal surface, the edge of outer cold iron piece is equipped with the structure of piecing together, and a plurality of outer cold iron piece concatenations form the chiller subassembly, and outer cold iron piece is outside through piecing together structure joint modular construction.

The utility model provides a small-size outer chill hang the very poor problem of sand effect, large-scale indirect outer chill adopts small-size outer chill combination formula preparation and application method. The external chill is clamped with a shaping mechanism through a splicing structure to form indirect external chill following production, and the indirect external chill is shaped together with a casting model. As a part of the sand mould, even a sand mould is formed, and the thickness of the sand hanging layer is uniform. The operability of the external chill is improved, the production efficiency is improved, the cost of the external chill is reduced, and the cost of castings is reduced.

The large-scale external chill is decomposed into a plurality of small-scale external chill blocks, the small-scale external chills are combined and hoisted to form a sand-coated sample block with the same appearance as a corresponding sample, and the use surface of the small-scale external chill is provided with a sand hanging groove. And sand is hung separately from the pattern, so that the defect of poor sand hanging effect of the small external chill is overcome. After sand is hung, the casting is spliced and combined to form the local or integral shape of the casting as a part of the casting mould, and then the casting mould and the rest of sand moulds are operated together in the molding process.

A plurality of contact grooves are arranged on the contact surface.

The contact surface is an arc surface.

The splicing structure comprises an open slot arranged at the corner of the outer cold iron block and a round rod arranged in the open slot, and the two ends of the round rod are fixedly connected with the inner wall of the open slot.

The shaping mechanism comprises a shape-following sample block and a shaping frame, the corners of the shaping frame are connected with the outer cold iron block through a splicing structure in a clamping manner, and the shape-following sample block is arranged between the inner wall of the shaping frame and the contact surface of the outer cold iron block.

The following model block is matched with the contact surface of the casting.

The shaping frame is provided with a clamping block clamped with the splicing structure.

Compared with the prior art, the utility model discloses the beneficial effect who has is:

the large-scale external chill is decomposed into a plurality of small-scale external chill blocks, the small-scale external chills are combined and hoisted to form a sand-coated sample block with the same appearance as a corresponding sample, and the use surface of the small-scale external chill is provided with a sand hanging groove. And sand is hung separately from the pattern, so that the defect of poor sand hanging effect of the small external chill is overcome. After sand is hung, the casting is spliced and combined to form the local or integral shape of the casting as a part of the casting mould, and then the casting mould and the rest of sand moulds are operated together in the molding process. The problem that the sand hanging effect of the small-sized external chill is poor is solved, and the large-sized indirect external chill adopts a combined manufacturing and using method of the small-sized external chill. The operability of the external chill is improved, the production efficiency is improved, the cost of the external chill is reduced, and the cost of castings is reduced.

1. The small external chilling block adopts a sample block sand coating technology, has good sand coating effect, can be independently used as an indirect external chilling block and used at the part with a single heat node and a complex appearance, and improves the casting quality.

2. The large-size external chilling block has high cost and high scrapping loss cost. By the mode of small block combination, the scrap loss cost is greatly reduced.

3. The external chill and the pattern are separated to hang sand, the operation is convenient, the production efficiency is improved, and the production period is shortened.

4. The method is suitable for various large castings, and is particularly suitable for series structures with similar specifications. With the continuous increase of the requirements of large-scale and precise mechanical equipment and the continuous improvement of the complexity and performance requirements of castings, the trend of improving the internal structure of the castings and improving the mechanical properties of the castings by utilizing external chillers is more and more obvious, and a plurality of castings need to use the external chillers to manufacture workpieces meeting the technical requirements and qualified performance. Meets the requirement of large-scale mechanical equipment.

Drawings

Fig. 1 is a structural schematic diagram of a combined annular external chiller.

Fig. 2 is a schematic structural diagram of a single external chiller.

Fig. 3 is a schematic diagram of a single external chill sand lining structure.

Wherein, 1, outer cold iron ring 2, outer cold iron piece 3, contact groove 4, combination face 5, rod 6, open slot 7, following type sample piece 8, fixture block 9, design frame.

Detailed Description

Fig. 1 to 3 are preferred embodiments of the present invention, and the present invention will be further explained with reference to fig. 1 to 3.

Referring to the attached figures 1-3: the utility model provides an indirect outer chill of large-scale foundry goods, includes a plurality of outer chill 2, and 2 terminal surfaces of outer chill are equipped with the structure of piecing together for being used for hanging the contact surface of sand, the edge of outer chill 2, and a plurality of outer chill 2 concatenations form the chill subassembly, and outer chill 2 outsides are through piecing together structure joint modular construction.

A plurality of contact grooves 3 are arranged on the contact surface. The contact surface is an arc surface. The splicing structure comprises an open slot 6 arranged at the corner of the outer cold iron block 2 and a round rod 5 arranged in the open slot 6, and the two ends of the round rod 5 are fixedly connected with the inner wall of the open slot 6.

The shaping mechanism comprises a shaping sample block 7 and a shaping frame 9, the corners of the shaping frame 9 are connected with the outer cold iron block 2 through a splicing structure in a clamping mode, and the shaping sample block 7 is arranged between the inner wall of the shaping frame 9 and the contact surface of the outer cold iron block 2. The following sample block 7 is matched with the contact surface of the casting. The shaping frame 9 is provided with a fixture block 8 which is clamped with the splicing structure.

The working principle and the working process are as follows:

the whole thick external chill is decomposed into a plurality of small external chill blocks 2, the small external chill is of a rectangular structure, the periphery of the small external chill is provided with a splicing combination surface, and the small external chill blocks are polished to be smooth. An open slot 3 is arranged at the junction of the periphery and the back, and a round stick 5 is preset in the open slot 3 and used as a device for hoisting, splicing, combining and fixing. The height can be adjusted by increasing or decreasing the number of layers, and the length can be adjusted by increasing or decreasing the number of modules. The contact surface of the external chill conforms to the shape of the corresponding casting part, and the contact surface is provided with a contact groove 3 so as to firmly cover the sand. And manufacturing a conformal sample block 7 with the same size as the contact surface of the external chill. The use surface of the conformal sample block 7 is manufactured by matching and grinding according to the surface shape of the corresponding casting provided with the external chill.

And manufacturing a sample block fixing frame, namely a shaping frame 9, along the periphery of the external chill, and fixing the conformal sample block 7. The thickness of the sand coating is generally about 15-20 mm, and a certain gap is kept between the using surface of the conformal sample block 7 and the casting contact surface of the external chill. The outer chill is placed in relevant position with the pattern, reserves out certain clearance, generally about 15 ~ 20mm to form the sand layer of hanging about 15 ~ 20mm, the molding sand is filled into to the clearance successive layer, and the tamping is incessantly filled into molding sand and tamp, and the preparation of hanging the sand layer is accomplished. During operation, the external chill is horizontally placed on a hard compaction plane, molding sand is filled in the external chill, and after preliminary tamping, the molding sand is coated by a sample block. Fixing the random sample block 7, tamping along all directions of the gap between the random sample block 7 and the external chill, and adding a tamping through hole on the sample block to strengthen tamping if the shape is complex. Standing for a period of time, solidifying the sand coating to certain hardness and strength, taking away the sample block, baking the external chill and the sand coating, completely solidifying, splicing and combining into a large external chill to form a local or integral shape of the casting as a part of a casting mold, combining with the rest parts of the sand mold into a complete sand mold, and performing mold closing and pouring.

The method is suitable for various large castings, and is particularly suitable for series structures with similar specifications. With the continuous increase of the requirements of large-scale and precise mechanical equipment and the continuous improvement of the complexity and the performance of castings, the trend of improving the mechanical performance of the castings by improving the internal structure of the castings by utilizing external chillers is more and more obvious, and a plurality of castings need to use the external chillers to manufacture workpieces meeting the technical requirements and qualified performance and meet the requirements of large-scale mechanical equipment.

While the invention has been described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention. However, any simple modification, equivalent change and modification made to the above embodiments according to the technical substance of the present invention still belong to the protection scope of the technical solution of the present invention.

Claims

1. The indirect external chill for the large casting is characterized in that: including a plurality of outer cold iron plate (2), the contact surface of outer cold iron plate (2) terminal surface for being used for hanging the sand, the edge of outer cold iron plate (2) is equipped with the structure of piecing together, and a plurality of outer cold iron plate (2) concatenations form the chiller subassembly, and outer cold iron plate (2) are outside through piecing together structure joint modular construction.

2. The large casting indirect external chill of claim 1, wherein: the contact surface is provided with a plurality of contact grooves (3).

3. The large casting indirect external chill of claim 1, wherein: the contact surface is an arc surface.

4. The large casting indirect external chill of claim 1, wherein: the splicing structure comprises an open slot (6) arranged at the corner of the outer cold iron block (2) and a round rod (5) arranged in the open slot (6), and the two ends of the round rod (5) are fixedly connected with the inner wall of the open slot (6).

5. The large casting indirect external chill of claim 1, wherein: the design mechanism include type sample piece (7) and design frame (9), the edge of design frame (9) is outside cold iron plate (2) outside through piecing together the structure joint, is equipped with type sample piece (7) between the contact surface of design frame (9) inner wall and outer cold iron plate (2).

6. The large casting indirect external chill of claim 5, wherein: the following type sample block (7) is matched with the contact surface of the casting.

7. The large casting indirect external chill of claim 5, wherein: the shaping frame (9) is provided with a clamping block (8) which is clamped with the splicing structure.