CN104475686A

CN104475686A - Sand mold casting method

Info

Publication number: CN104475686A
Application number: CN201410689686.XA
Authority: CN
Inventors: 王云社; 周仕勇; 李兴华
Original assignee: SHANDONG YUANTONG MACHINERY CO Ltd
Current assignee: SHANDONG YUANTONG MACHINERY CO Ltd
Priority date: 2014-11-25
Filing date: 2014-11-25
Publication date: 2015-04-01

Abstract

The invention relates to a sand mold casting method, and belongs to the technical field of sand mold casting. The sand mold casting method adopts a sand core print used in the sand mold casting, wherein the sand core print is a formed metal core print. The metal formed core print is formed in a machining manner and is simple in shape and structure, and precise in size, so that a sand core can be accurately fixed, and the strength of the core print can be improved. Not only can metal liquid be prevented from entering a gap of the core print when in pouring not to block a ventilation passage, but also the core print can be prevented from being damaged by the sand core in large size with a small core print; moreover, the sand core only with a lower core print can be prevented from floating. A chilling block effect also can be realized; moreover, the reusability can be realized, and the size precision and rate of finished product of a cast prepared in the method can be remarkably improved.

Description

Sand mould casting method

Technical field

The present invention relates to a kind of sand mould casting method, belong to sand casting technical field.

Background technology

In the prior art, the sand core head part used in ordinary sand casting is generally the same with core main body, adopts core sand to make.This traditional casting sand core molten metal when pouring into a mould easily pierces along clearance, blocks core exhaust duct sometimes, causes foundry goods to choke fire, causes pore, inclusion defect.Some sand core heads easily damage in carrying, lower core process, affect core location and even cause core to scrap; Some cores are large and core print is little, are difficult to the weight of support core or bear huge buoyancy.

Summary of the invention

The object of this invention is to provide a kind of use forming metal core print, can accurately fixing core, preventing clearance from piercing molten metal when pouring into a mould, the sand mould casting method of blocking airway.

Sand mould casting method of the present invention, comprises the sand core head used in sand casting, and this sand core head is forming metal core print.

Described forming metal core print is provided with passage and arbor fixing hole, also can be connected with arbor and make an entirety.

The center of described forming metal core print arranges longitudinal exhaust duct, uniformly on exhaust duct arranges passage, and arbor fixing hole is perpendicular to exhaust duct.

Described forming metal core print adopts alloy to make, and preferred casting pig is made.

Described forming metal core print is made by machining, and reusable.

The preparation method of forming metal core print of the present invention, comprises the following steps:

(1) according to the casting structure shaping metal-cored head shapes of design and size thereof, material requirement is met;

(2) shaping metal-cored head drawing is drawn;

(3) forming metal core print is completed by machining;

(4) cleaning.

First forming metal core print and core box, arbor are mounted with during coremaking, then back-up sand coremaking.

Beneficial effect of the present invention is as follows:

The metal forming core print that the present invention adopts, is formed by machining, and its shape and structure is simple, and size is accurate, is conducive to core and accurately fixes, improve the intensity of core print.Not only can preventing clearance from piercing molten metal when pouring into a mould, blocking airway, preventing the core that core is large and core print is little from damaging core print by pressure, and floating movement when can prevent only having the core of lower core print to pour into a mould.Can also play the effect of chill, and can reuse, dimensional accuracy and the yield rate of the foundry goods adopting the present invention to obtain significantly improve.

Accompanying drawing explanation

Fig. 1 is forming metal core head structure schematic diagram;

Fig. 2 is boiler sheet sand cores of castings structural representation;

In figure: 1, exhaust duct; 2, passage; 3, arbor; 4, forming metal core print; 5, arbor fixing hole; 6, sand core head; 7, boiler sheet sand cores of castings.

Detailed description of the invention

Below in conjunction with accompanying drawing, the embodiment of the present invention is described further:

As shown in Figure 1, described sand mould casting method, comprises the sand core head used in sand casting, and this sand core head is forming metal core print 4.The structure of forming metal core print 4 is as follows:

Forming metal core print 4 is provided with passage 2 and arbor fixing hole 5, and center arranges longitudinal exhaust duct 1, uniformly on exhaust duct 1 arranges passage 2, and arbor fixing hole 5 is perpendicular to exhaust duct 1; Forming metal core print 4 can also make an entirety with arbor 3;

Forming metal core print 4 adopts alloy to make, and preferably adopts casting pig to make.Forming metal core print 4 is made by machining, and can reuse.

Application Example:

Fig. 2 is a kind of boiler sheet sand cores of castings 7 exporting the U.S., and because the sand core head 6 of this foundry goods can only be arranged at two limbers places on foundry goods diagonal angle, sand core head 6 less and little, also must offer exhaust duct in core print.Originally film-covering sand hot corebox coremaking, core print is also precoated sand certainly, in addition have employed coarse size, special precoated sand that resin amount is little to reduce core gas forming amount, boiler sheet sand cores of castings 7 intensity is lower, often occur in production process that sand core head 6 damages, cause the incomplete phenomenon of shape, have a strong impact on the dimensional accuracy of foundry goods, once cause because casting section thickness is overproof foreign trader's batch to return goods, lose nearly 1,000,000 yuans.

Through repetition test, we have employed the forming metal core print 4 shown in Fig. 1 at design.By boiler sheet core print cylinder iron or round steel process, upper and lower core print is made of one, and processes many places passage 2 and an exhaust duct 1.First forming metal core print 4 is placed in hot box core print seat during coremaking, fixes with the arbor 3 mated with exhaust duct 1.After this forming metal core print 4, singly not ensure that the accurate of the complete of core print and core location, also make core print play the effect of chill, prevent iron liquid from piercing core print and core print seat gap blocks exhaust duct 1, casting dimension accuracy and yield rate significantly improve.

Claims

1. a sand mould casting method, comprises the sand core head used in sand casting, it is characterized in that: sand core head is forming metal core print.

2. sand mould casting method according to claim 1, is characterized in that: described forming metal core print is provided with passage and arbor fixing hole.

3. sand mould casting method according to claim 1 and 2, is characterized in that: the center of described forming metal core print arranges longitudinal exhaust duct, uniformly on exhaust duct arranges passage, and arbor fixing hole is perpendicular to exhaust duct.

4. sand mould casting method according to claim 1, is characterized in that: described forming metal core print and arbor connect as one.

5. sand mould casting method according to claim 1, is characterized in that: described forming metal core print adopts alloy to make.

6. sand mould casting method according to claim 5, is characterized in that: described forming metal core print adopts casting pig to make.

7. sand mould casting method according to claim 1, is characterized in that: described forming metal core print is made by machining.

8. sand mould casting method according to claim 1, is characterized in that: described forming metal core print can be reused.