CN203470849U

CN203470849U - Rapid cooling sand box

Info

Publication number: CN203470849U
Application number: CN201320486884.7U
Authority: CN
Inventors: 郝行章; 李钊
Original assignee: Hebei Jikai Casting Industry Co Ltd
Current assignee: Hebei Jikai Casting Industry Co Ltd
Priority date: 2013-08-09
Filing date: 2013-08-09
Publication date: 2014-03-12
Anticipated expiration: 2023-08-09

Abstract

The utility model discloses a rapid cooling sand box. The rapid cooling sand box comprises a box wall, wherein a seamless tube arranged around the periphery of an inner side wall and used for circulating cooling water is fixedly arranged on the box wall by a plurality of support frames, the seamless tube is an uninterrupted hollow pipe which is bent into S-shaped, a plurality of box belts are welded on the seamless tube at intervals, and the other ends of the box belts extend to the middle part of the sand box. The rapid cooling sand box is reasonable in structure and has the advantages that the problem of heat dissipation of a casting in a sand mold in solidification and heat preservation processes is effectively solved, the purpose of rapidly cooling the casting is achieved, the heat preservation time of the casting in the sand mold is shortened by 1/4, the tendency of layer-by-layer solidification in the casting is intensified, the internal structure of the casting obtained in the end is compact without shrinkage cavities and porosity, and the product quality is ensured.

Description

A kind of quick cooling sandbox

Technical field

The utility model relates to the technological equipment that a kind of Foundry Production is used, specifically a kind of sandbox.

Background technology

Sandbox is a kind of main technique equipment using in Foundry Production, need to be in sandbox in foundry production moulding pouring into a mould, because box moulding is easy to operate, strong adaptability, applicable to the sand casting of various foundry goods, produce, therefore the application of sandbox and extensively, reasonably sandbox structure to obtaining premium casting, raising labour productivity also has great role.

Sandbox profile be mainly by tank wall, surrounded for holding, support a quadro frame structure of molding sand.During Foundry Production, first carry out box moulding, so-called box moulding refers to fills in molding sand consolidation molding in sandbox, still uses sandbox to support sand mold so that a kind of casting production process of handling and cast after molding.After box moulding, pour into a mould, casting complete can take out foundry goods by shake out after foundry goods cooling forming.But due to poor thermal conductivity, the good heat preservation performance of molding sand, after casting pouring completes, sand mold cooling slowly, need to wait as long for just and can carry out shake out, sand removal work, has extended the production cycle of foundry goods, has reduced production efficiency.Simultaneously due to foundry goods in sand mold for a long time in the condition of high temperature, make the foundry goods of producing produce thick equiax crystal district, the coarse grains of foundry goods inside, intercrystalline microcosmic loosen more, foundry goods is organized not fine and close, cause foundry goods mechanical performance cannot reach instructions for use, seriously restricted the development of casting industry.

For accelerating the cooling of sand mold, generally adopt after pouring cast part the mode of shake out fast to improve foundry goods cooling velocity, when foundry goods is incubated in sandbox, after 1～3min, just breaks up greatly molding sand taking-up foundry goods and start air cooling.But this type of cooling is mainly applicable to the production of small-sized foundry goods, and adopt of sandbox split case molding more.Because foundry goods has the process of a solidification and crystallization after pouring into a mould, small-sized foundry goods can complete coagulation forming process within a short period of time, thereby forms certain rigidity, guarantees casting dimension accuracy.And for medium-and-large-sized foundry goods, because cooling velocity is slower, the molten steel of foundry goods inside is difficult to solidify within a short period of time, shake out air cooling can cause casting dimension deviation, produce distortion fast.

Utility model content

The utility model technical issues that need to address are to provide a kind of quick cooling sandbox that can realize quick release heat, cooling foundry goods.

For solving the problems of the technologies described above, the technical scheme that the utility model adopts is:

A kind of quick cooling sandbox, comprise tank wall, on described tank wall, by some bracing frames, be fixedly installed the seamless pipe for circulation cycle cooling water of arranging around madial wall border, described seamless pipe is that a bending is snakelike uninterrupted hollow tube, on seamless pipe, some case bands are welded at interval, and the other end of case band extends to sandbox middle part.

Further improvement of the utility model is: the two ends of described seamless pipe is respectively by being welded and fixed a snap joint.

Further improvement of the utility model is: described seamless pipe is bent into some straightways that interconnect and bending segment by bending process, and the distance between adjacent two straightways is 120～150mm.

Further improvement of the utility model is: the straightway of described seamless pipe for being arranged in parallel with sandbox bottom surface, be 90 ° with sandbox bottom surface and be arranged vertically, be the combination of one or more forms of 45 ° of layouts with sandbox bottom surface.

Further improvement of the utility model is: the cross section that described case band is steel is leg-of-mutton prism.

Owing to having adopted technique scheme, the technological progress that the utility model is obtained is:

Of the present utility model rational in infrastructure, around border inside the tank wall of sandbox, arrange snakelike hollow seamless pipe, after casting complete, utilize the recirculated cooling water passing in seamless pipe to lower the temperature to sand mold, efficiently solve foundry goods and in sand mold, solidify the heat dissipation problem in insulating process, reached the object of quick cooling foundry goods, shortened foundry goods temperature retention time of 1/4 in sandbox, strengthened the tendency of Layer by layer solidification in foundry goods, the foundry goods dense internal organization finally obtaining and without shrinkage cavity, loose, has guaranteed product quality.Case band is selected the triangular prism of steel, and one end of case band is welded on seamless pipe, and the other end extends to sandbox middle part, is convenient to contact with molding sand, has accelerated the heat transmission of molding sand, is conducive to fast reducing molding sand temperature, cooling foundry goods.

In seamless pipe two ends, be welded and fixed snap joint, be convenient to fast operating when passing into cooling water, save the operating time, improved production efficiency.Seamless pipe is bent into straightway and bending segment by bending process, be conducive to be fixed on tank wall inner side, increased the contact area of seamless pipe and molding sand, improved cooling down effect, distance between adjacent straight line segment is set to 120～150mm, when guaranteeing cooling effect, prevented because distance too closely causes the waste of seamless pipe, reduced cost.

Utilize the utility model to produce the remarkable refinement of foundry goods as cast condition grain size obtaining, compare with the foundry goods that uses conventional sandbox production to obtain, grain size has improved 1～2 grade, the as-cast structure content of pearlite in alloy of foundry goods reaches more than 85%, yield strength has improved 20%, tensile strength improves 15%, and anti-wear performance has improved 15%.

Accompanying drawing explanation

Fig. 1 is structural representation of the present utility model;

Fig. 2 is the wherein seamless pipe layout expanded view of the tank wall inner side of a kind of embodiment of the utility model.

Wherein, 1, tank wall, 2, bracing frame, 3, seamless pipe, 31, straightway, 32, bending segment, 4, case band.

The specific embodiment

Below in conjunction with drawings and Examples, the utility model is described in further details:

A quick cooling sandbox, comprises tank wall 1, bracing frame 2, seamless pipe 3 and case band 4.

The structure of described sandbox as shown in Figure 1, tank wall 1 adopts carbon steel around being welded, in tank wall 1 inner side, be fixedly installed the bracing frame 2 of some steel, the quadro frame structure that support frame as described above 2 is openings at one side, openend is welded on tank wall 1 madial wall, and bracing frame 2 border inside tank wall is evenly arranged.Described seamless pipe 3 is fixedly installed on tank wall 1 inner side by bracing frame 2, around tank wall 1 border, inner side, is evenly arranged.It is leg-of-mutton prism that described case band 4 is arranged to cross section, adopts the cutting of carbon steel steel plate to form.Case band 4 intervals arrange some, and a side weld of case band 4 one end connects and is arranged on seamless pipe 3; The pointed nose of the other end extends to sandbox middle part.

Described seamless pipe 3 is stainless steel Integral hollow pipe, seamless pipe 3 is bent into some straightways 31 and bending segment 32 by bending process, straightway 31 and bending segment 32 all join end to end and interconnect is one whole coiled pipe, seamless pipe 3 can have following various ways around the arrangement of tank wall 1 inner side: straightway 31 and the sandbox bottom surface of seamless pipe 3 are arranged in parallel, and the width of the tank wall that the length of straightway 31 is accompanying with seamless pipe is corresponding; Straightway 31 and the sandbox bottom surface of seamless pipe 3 are 90 ° and are arranged vertically, and the length of straightway 31 is corresponding with the height of tank wall; Straightway 31 and the sandbox bottom surface of seamless pipe 3 are 45 ° of layouts, and the size of straightway 31 is corresponding with the size of sandbox tank wall 1.Wherein the distance between two adjacent straightways is generally 120～150mm.The arrangement of seamless pipe 3 can only be selected a kind of arranged in form wherein, also can select several form combination layouts wherein to form simultaneously.In the present embodiment, the arrangement of seamless pipe 3 on tank wall 1 as shown in Figure 2, seamless pipe 3 distributes at the cranky circle of madial wall of four tank walls, be set to straightway 31 and sandbox bottom surface and be the combination that 90 ° of vertical and straightways and sandbox bottom surface are 45 ° of two kinds of forms, the distance between adjacent straightway is set to 150mm.For saving the operating time, in the two ends of seamless pipe 3, weld respectively a snap joint is set, connection cooling water source that can be easily and fast after casting complete, enhances productivity.

Use cooling procedure of the present utility model and quick cooling principle to be:

During filling moulding, mould is placed on to sandbox middle part, the molten steel of melting is tapped and is poured into a mould after reaching pouring temperature.

After casting complete, molten steel starts heat radiation, foundry goods is coagulation forming gradually, because molten steel temperature is higher, large with the thermograde of molding sand, heat in molten steel is delivered in molding sand fast, now the heat in molding sand does not also arrive seamless pipe 3 places, one end of case band 4 is welded on seamless pipe, the other end of case band extends to sandbox middle part, during moulding, case band 4 is wrapped in molding sand, because described case band 4 adopts carbon steel to make, the thermal conductivity of steel plate is greater than the thermal conductivity of molding sand, therefore case band 4 can be delivered to seamless pipe 3 places fast by the heat near in the molding sand of foundry goods, make seamless pipe 3 just can start to take away at short notice the heat of foundry goods.

After casting complete, in seamless pipe 3, just start to pass into the cooling water of circulation, wherein water flowing flow set is 50L/min, and the water flowing time, computing formula was: t=m*0.3 by calculating.In formula, t is the water flowing time, with min, calculates; M, for cast molten steel quality, calculates with Kg.After heat is after a while transmitted, the molding sand temperature of closing on seamless pipe 3 places has also raise, and the cooling water passing into just can be taken away the heat in molding sand around it and case region in time.Like this, between foundry goods and molding sand, between molding sand and sandbox, all keeping larger thermograde always, under large thermograde, make the heat of foundry goods be passed to seamless pipe by case band, by the cooling water in seamless pipe, lower the temperature, make constantly outside distribute heat of foundry goods, heat in foundry goods transmits continuously in molding sand, and the heat in molding sand is discharged by sandbox again.By taking this pressure cooling way, accelerated cooling velocity, improved foundry goods Quench ability.

After water flowing finishes, use the residual water in compressed air emptying seamless pipe 3, carry out afterwards the operation of shake out knockout.

Claims

1. a quick cooling sandbox, comprise tank wall (1), it is characterized in that: the upper seamless pipe for circulation cycle cooling water (3) of arranging around madial wall border that is fixedly installed by some bracing frames (2) of described tank wall (1), described seamless pipe (3) is that a bending is snakelike uninterrupted hollow tube, some case bands (4) are welded at the upper interval of seamless pipe (3), and the other end of case band (4) extends to sandbox middle part.

2. a kind of quick cooling sandbox according to claim 1, is characterized in that: the two ends of described seamless pipe (3) is respectively by being welded and fixed a snap joint.

3. a kind of quick cooling sandbox according to claim 1, it is characterized in that: described seamless pipe (3) is bent into some straightways that interconnect (31) and bending segment (32) by bending process, and the distance between adjacent two straightways is 120～150mm.

4. a kind of quick cooling sandbox according to claim 3, is characterized in that: the straightway (31) of described seamless pipe (3) for being arranged in parallel with sandbox bottom surface, be 90 ° with sandbox bottom surface and be arranged vertically, be the combination of one or more forms of 45 ° of layouts with sandbox bottom surface.

5. a kind of quick cooling sandbox according to claim 1, is characterized in that: described case band (4) for the cross section of steel be leg-of-mutton prism.