CN102019359A - Sand-core molding method of ultra-large sand core structural casting - Google Patents

Abstract

The invention relates to a molding method of a large casting, in particular to a sand-core molding method of an ultra-large sand core structural casting. The method comprises the following steps of: coding a sand core; manufacturing the sand core; manufacturing a core box; coremaking; and setting the core. The process method provided by the invention is unique, can avoid partial or large-area size inconsistence of the casting, partial poor shape and hole shrinkage caused by the damaged sand core in the traditional process of making, conveying and setting an ultra-large sand core in a complicated structure and can ensure the product quality and shorten the production period.

Description

A kind of core formative method of ultra-large type sand core structure foundry goods

Technical field

The present invention relates to a kind of heavy castings formative method, especially relate to a kind of core formative method of ultra-large type sand core structure foundry goods.

Background technology

The complicated steel-casting of large scale structure is complex-shaped, and inner chamber is made up of a lot of curved-surface structures, and the moulding sand core structure designs is one of technical barrier in the industry always.The moulding scheme that domestic manufacturer few in number adopts mostly all is big core cored-up mould method, and the heavier handling process of core is difficult to control, and damaged location is more, and the casting dimension deviation is big, and moulding and disposal costs rise.The foundry goods that causes of well damage is scrapped.This type of structural casting adopts whole core-making method mainly to have following three shortcomings: size, tonnage, complexity or the like; 1) core is heavy especially, and all about about 40 tons, inconvenience is very put in the core handling for 2# core and 3# core, does not have enough good place to put so big core, puts process in handling core damage in various degree also can take place.Production cycle is all more than 1 month; 2) sand core structure and the weight of self have determined arbor intensity can't reach the requirement of standard, the handling process of putting has distortion to a certain degree, can cause the core fit dimension not to be inconsistent in following core process, adjust very difficulty, fuse can't advance die cavity down when the distortion size was big especially, and core is scrapped and produced one again; 3) the unreasonable core process down of sand core structure produces bump, and it is more to cause core to damage.

Summary of the invention

The objective of the invention is to overcome the deficiencies in the prior art, a kind of process uniqueness is provided, can avoids the damage of core in the existing coremaking of ultra-large type complex structure core, handling and the following core process, the foundry goods part or the large tracts of land size that cause are not inconsistent, bad and the shrinkage cavity of local shape, and can guarantee product quality, shorten the core formative method of a kind of ultra-large type sand core structure foundry goods of production cycle.

In order to realize goal of the invention, the present invention realizes in the following way:

A kind of core formative method of ultra-large type sand core structure foundry goods is characterized in that: this method comprises the steps:

A. core is numbered: the middle part of core is compiled to 1#, left side are 2#, and the right side is 3#;

B. make core: two false cores about former and later two big core mouth of pipe positions make, change original 2# core into two cores, 3-1# and 3-2# core divide two-layer knockout up and down;

C. make core box: increase a dividing plate in the middle of core box, the arbor top frame adopts the 120*120 square steel, and bottom bracket adopts the 80*80 square steel;

D. coremaking: use special-purpose consolidation instrument, guarantee the key position degree of packing, the layout of giving vent to anger is guaranteed mold thickness, tightly is wrapped on the arbor, and the reinforcement spacing is 30-50mm, guarantees sand mold local strength;

E. play core: core plays core in order according to numbering, the handling process is drink spiked and is put down gently, especially must pay special attention to turning over the core process, adjust balance repeatedly, it is slow that following core process operation is wanted, and the stage of in the end regulating will guarantee that 3mm with interior hunting range, has measured size before the core that falls, guarantee once to put in place down, repeat at most once;

Described making core box median septum thickness is between 40-60mm.

The present invention has following effect:

1) process uniqueness: avoid the damage of core in the existing coremaking of ultra-large type complex structure core, handling and the following core process, the foundry goods part or the large tracts of land size that cause are not inconsistent, the bad and shrinkage cavity of local shape.Solve a series of problems of this ultra-large type core manufacture process, guarantee product quality, shorten the production cycle.Find out the design experiences of ultra-large type core, form a kind of ultra-large type core method for designing of maturation, the core design more complicated, more large-scale for next step core lays the first stone.

2) make core technology uniqueness: the improvement of method sand core structure design aspect provided by the invention has following three aspects: two false cores about former and later two big core mouth of pipe positions are made, change original 2# core into two cores, arbor intensity is guaranteed, intensity improves, can not deform, handling and put handled easily, 3-1# and 3-2# core divide two-layer knockout up and down, have avoided the damage at core wedge angle position.

3) structure of core box is improved: increase a dividing plate in the middle of the method core box provided by the invention, block board thickness is between 40-60mm, guarantee intensity, disconnected position is guaranteed not interfere with rising head and chill, arbor redesign top frame adopts the 120*120 square steel, and bottom bracket adopts the 80*80 square steel, and arbor length reduces, improve intensity, avoid chill, rising head.

4) coremaking operating process uniqueness: method operating process provided by the invention must carefully be operated, and uses special-purpose consolidation instrument, guarantees the key position degree of packing, the layout of giving vent to anger is guaranteed mold thickness, tightly be wrapped on the arbor, the reinforcement spacing is reasonable, guarantees sand mold local strength.

5) core operation down: core must play core in order according to numbering, can not transpose, the handling process must be drink spiked and be put down gently, especially must pay special attention to turning over the core process, adjusts balance repeatedly, prevent that sand mold from damaging, it is slow that following core process operation is wanted, and the stage of in the end regulating will guarantee that 3mm with interior hunting range, has measured size before the core that falls, guarantee once to put in place down, repeat once at most.

6) the branch core design of the complicated sand core of steel casting of large scale structure, made things convenient for the modeling process operation, avoided the damage of core, help the modeling process size Control, shorten the production cycle, reduced production cost, solved a series of problems such as design, operating process, sand core strength of ultra-large type core, formed ultra-large type core core design experiences, for the manufacturing of ultra-large type core later on provides valuable experience.

Description of drawings

Fig. 1 is core numbering structural representation of the present invention;

Fig. 2 is two false core schematic diagrames about former and later two big core mouth of pipe positions of the present invention make;

Fig. 3 is a 2# core schematic diagram of the present invention;

Fig. 4 is a 3# core schematic diagram of the present invention;

Fig. 5 is the structural representation of core box of the present invention.

The specific embodiment

A kind of core formative method of ultra-large type sand core structure foundry goods is characterized in that: this method comprises the steps:

A. core is numbered: as shown in Figure 1 the middle part of core is compiled to 1#, left side are 2#, the right side is 3#;

B. make core: as shown in Figure 2: two false cores 4 about former and later two big core mouth of pipe positions make, change original 2# core into two cores as shown in Figure 3,3-1# and 3-2# core divide two-layer knockout up and down as shown in Figure 4;

C. make core box: increase a dividing plate 5 as shown in Figure 5 in the middle of core box, the arbor top frame adopts the 120*120 square steel, and bottom bracket adopts the 80*80 square steel;

D. coremaking: use special-purpose consolidation instrument, guarantee the key position degree of packing, the layout of giving vent to anger is guaranteed mold thickness, tightly is wrapped on the arbor, and 30-50mm is reasonable for the reinforcement spacing, guarantees sand mold local strength;

E. play core: core plays core in order according to numbering, the handling process is drink spiked and is put down gently, especially must pay special attention to turning over the core process, adjust balance repeatedly, it is slow that following core process operation is wanted, and the stage of in the end regulating will guarantee that 3mm with interior hunting range, has measured size before the core that falls, guarantee once to put in place down, repeat once at most.

Above-mentioned making core box median septum thickness is between 40-60mm.

Claims (2)

1. the core formative method of a ultra-large type sand core structure foundry goods, it is characterized in that: this method comprises the steps:

A. core is numbered: the middle part of core is compiled to 1#, left side are 2#, and the right side is 3#;

B. make core: two false cores about former and later two big core mouth of pipe positions make, change original 2# core into two cores, 3-1# and 3-2# core divide two-layer knockout up and down;

C. make core box: increase a dividing plate in the middle of core box, the arbor top frame adopts the 120*120 square steel, and bottom bracket adopts the 80*80 square steel;

D. coremaking: use special-purpose consolidation instrument, guarantee the key position degree of packing, the layout of giving vent to anger is guaranteed mold thickness, tightly is wrapped on the arbor, and the reinforcement spacing is 30-50mm, guarantees sand mold local strength;

E. play core: core plays core in order according to numbering, the handling process is drink spiked and is put down gently, especially must pay special attention to turning over the core process, adjust balance repeatedly, it is slow that following core process operation is wanted, and the stage of in the end regulating will guarantee that 3mm with interior hunting range, has measured size before the core that falls, guarantee once to put in place down, repeat once at most.

2. the formative method of a kind of foundry goods ultra-large type sand core structure as claimed in claim 1 is characterized in that: described making core box median septum thickness is between 40-60mm.

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