CN208374127U - A kind of sand core for sand casting - Google Patents

Abstract

The utility model discloses a kind of sand cores for sand casting comprising sand core ontology is equipped with cavity in the sand core internal, is equipped at least one sand removing hole in the sand core, the sediment outflow piston for blocking sediment ejection opening is equipped at the sand removing hole.A kind of usage amount that molding sand and resin can be greatly decreased for the sand core preparation method of sand casting provided by the utility model, it reduces resin gas forming amount and improves the efficiency decored with knockout, improve old sand machinery regeneration efficiency, reduce resource cost, waste discharge and cost, the production efficiency for improving casting is the possible technique and method for realizing Green foundry.

Description

A kind of sand core for sand casting

Technical field

The utility model relates to sand casting fields, and in particular to a kind of hollow sand cores preparation side for sand casting Method.

Background technique

Core procedure is mostly used greatly in the casting method of the casting of inner cavity, by knockout after casting solidification and decores formation gold Belong to inner cavity.Traditional sand core preparation is to pass through binder using silica sand, ceramsite sand, chromite sand, olivine sand as main material With the chemical reaction curing molding of curing agent, core mould is mostly used greatly in conventional casting techniques, and sand or artificial is penetrated by machinery Back-up sand is completed, and curing process is divided into heat cure and cold curing again.The sand core technology of preparing that this patent proposes is printed in 3DP sand mold What the self-hardening preparation on machine by Chemical Felter was completed.

It is had the following problems in existing large-scale solid sand core casting process: 1) needing to consume more resinoid bonds, Resin is the prime cost constituent element of coremaking；2) organic resin generates bulk gas in casting process, is that casting is caused to lack Sunken principal element；3) knockout and decoring are to separate by shaking to be crushed with casting, are the difficult points in casting post-processing, the reason is that real Heart sand core strength is high, and it is broken to be not easy vibration；4) regenerating used requires quality high, and cost and waste discharge pressure are big.

Hollow sand cores are prepared using design core pulling in shell mold technical operation or mold currently, also having, but because manufacturing process limits, Using not extensive.3DP printing sand core is used without mould and increases material manufacturing technology, is provided for hollow or hollow out sand core manufacture Available condition.

Summary of the invention

The utility model is to provide one kind in order to overcome the problems, such as that sand core gas forming amount is big in the prior art and knockout is difficult and be used for Hollow sand cores of sand casting and preparation method thereof can effectively reduce casting cost, alleviate large quantity of exhaust gas object and generate dirt Dye and environmental protection pressure, improve the quality of product.

To achieve the above object, the utility model provides a kind of sand core for sand casting comprising sand core ontology, It is characterized in that, is equipped with cavity in the sand core internal, be equipped at least one sand removing hole in the sand core, set at the sand removing hole There is the sediment outflow piston for blocking sediment ejection opening.

A kind of sand core prepared by 3DP printing device, it is preferred that, the cavity along vertical sand removing hole axis The section in direction is in hollow grid shape.

A kind of sand core prepared by 3DP printing device, it is preferred that, the hollow grid is positive polygonal mesh Shape.

A kind of sand core prepared by 3DP printing device, it is preferred that, the hollow grid is regular hexagonal cell Shape.

Preferably, the sand removing hole is equipped with only in the outer end of the big inner end in outer end small taper hole shape or the sand removing hole Mouthful；The shape of the sediment outflow piston is adapted to the sand removing hole.

A kind of sand core for sand casting described in the utility model, it is preferred that, it is equipped on sediment outflow piston One gas vent.

A kind of sand core for sand casting described in the utility model the preparation method comprises the following steps:

S1, core design: according to the shape of sand core, sand core threedimensional model is designed by modeling software, is set in sand core internal There is a cavity, is equipped with sand removing hole in sand core one end, sediment outflow piston is equipped at sand removing hole；

S2, sand core preparation: sand core is prepared using 3DP resin sand by 3DP printing device；

S3, sediment outflow chewing-gum envelope: sediment outflow piston is blocked by sand removing hole by heat-resistant adhesive.

A kind of sand core preparation method for sand casting described in the utility model, it is preferred that, including it is following Step:

S1, core design: according to the shape of sand core, sand core threedimensional model is designed by modeling software, is set in sand core internal There is a cavity, is equipped with sand removing hole in sand core one end, sediment outflow piston is equipped at sand removing hole；

S2, sand core preparation: sand core is prepared using 3DP resin sand by 3DP printing device；

S3, filling sand discharge: the dry sand in cavity is emitted by sand removing hole；

S4, sediment outflow chewing-gum envelope: sediment outflow piston is blocked by sand removing hole by heat-resistant adhesive.

3DP sand mold printing technique is washability increases material manufacturing technology, while being Non-mould shaping technique again.Sand elder generation and curing Mixing, mixed sand sensitive paper are equally laid with one layer, and printer head can according to the data progress that sand core digital-to-analogue designs acquisition single layer The property selected sprayed resin, the sand of resin is solidified into because the curing generation that resin and sand surface layer coats chemically reacts in injection Type, there is no chemosettings for the position sand of sprayed resin, only as filler.Therefore hollow or hollow out sand core Design be arbitrary, resist the impact flow of metal liquid, buoyancy, setting expansion or systolic pressure guaranteeing that sand core has It can be substantially reduced solid section under intensity, while considering the feasibility of sand discharge and exhaust.

The design of sand core internal cavity can effectively reduce the dosage of sand, effectively reduce casting cost, sediment outflow piston Can space in closed cavity, guarantee the quality of cast article；If hollow sand cores volume is excessive, filling sand can not also be discharged Improve the intensity of hollow sand cores.

The preparation method of sand core described in the utility model, wherein sand core passes through 3DP Chemical Felter self-hardening in step S2 Printing sand mold technology is prepared.

Sand core described in the utility model, wherein cavity is in hollow grid shape.Hollow grid can provide intensity for sand core, It can preferably guarantee the shape and intensity of hollow sand cores when sand core volume increases.

Sand core described in the utility model, it is preferred that, hollow grid is regular hexagon.Its with stable structure, The high advantage of intensity.

A kind of sand core preparation method for sand casting described in the utility model, it is preferred that, sand core is applicable in In conventional metals type and sand casting process.

The utility model can be discharged by sand removing hole after the completion of sand core preparation and be filled out due to being equipped with a cavity in sand core Sand is filled, reduces the dosage of sand, effectively reduces casting cost.

The utility model is further equipped with hollow grid in cavity, and intensity can be provided for hollow sand cores, improves product Quality.

Detailed description of the invention

Fig. 1 is a kind of sand core preparation method flow chart for sand casting；

Fig. 2 is the sand core sectional view of embodiment 1；

Fig. 3 is the cross section structure schematic diagram of the sand core of embodiment 1；

Fig. 4 is the sand core perspective view of embodiment 2；

Fig. 5 is the profilograph of Fig. 4；

Fig. 6 is the Section A-A figure of Fig. 5；

Fig. 7 is the sand core preparation method flow chart of embodiment 2；

Fig. 8 is the sand core sectional view of embodiment 3.

Appended drawing reference:

1, sand core；2, cavity；3, sand removing hole；4, sediment outflow piston；5, gas vent；6, hollow grid.

Specific embodiment

Illustrate specific embodiment of the present utility model with reference to the accompanying drawings of the specification.

Referring to Fig. 1,2,3, embodiment 1, the present embodiment provides a kind of sand cores for sand casting comprising sand core 1, A cavity 2 is equipped with inside sand core 1, sand core 1 is equipped with the sand removing hole 3 of a flared, is equipped at sand removing hole 3 for blocking sediment outflow The sediment outflow piston 4 of mouth 3；Sediment outflow piston 4 is equipped with a gas vent 5.Sand removing hole 3 is tapered opening shape big outside and small inside, and sediment outflow is living Shape matches plug 4 therewith.A plurality of cavities can be set apparently according to needs, and match the sediment outflow piston of corresponding sand removing hole.

As shown in Figure 1, the preparation method of the sand core of the present embodiment the following steps are included:

S21, sand core 1 design: according to the shape of sand core 1,1 threedimensional model of sand core are designed by modeling software, in sand core 1 Portion is equipped with a cavity 2, is equipped with sand removing hole 3 in 1 one end of sand core, sediment outflow piston 4 is equipped at sand removing hole 3, is set on sediment outflow piston 4 There is a gas vent 5；

Prepared by S2, sand core 1: preparing sand core 1 and sediment outflow piston 4 using 3DP resin sand by 3DP printing device；

S3, filling sand discharge: the dry sand in cavity 2 is emitted by sand removing hole 3；

S4,3 glue of sand removing hole envelope: sediment outflow piston 4 is blocked by sand removing hole 3 by heat-resistant adhesive.

Embodiment 2,

As shown in figures 4-6, the present embodiment provides a kind of sand cores for sand casting comprising sand core 1, in sand core 1 Portion is equipped with cavity 2, and sand core 1 is equipped at least one sand removing hole 3, and three sand removing holes 3 are arranged, in sediment outflow in the embodiment shown with Fig. 2 The sediment outflow piston 4 for blocking sand removing hole 3 is equipped at mouth 3.In order to guarantee that shape is coincide after blocking, it is equipped at sand removing hole 3 outer Small seam allowance 31 in big, the end face of sediment outflow piston 4 be equipped with the matched boss of seam allowance 31, make at the lid to sand removing hole of sediment outflow piston 4, 4 outer end face of sediment outflow piston is concordant with the end face of sand removing hole 3.Sediment outflow piston 4 is equipped with a gas vent 5.

Referring to fig. 4, the section along vertical sand removing hole axis direction of cavity 2 is in 6 shape of hollow grid.It, should in the present embodiment Hollow grid 6 is regular hexagonal cell shape.Obviously, it also can choose the mesh shape of positive triangle shape or regular pentagon shape, six Side shape stress is best.Cavity 2, which is designed as hollow grid shape, can be improved the intensity of sand core, equally can achieve and is easy to knockout And decoring, and reduce regenerating used cost and waste discharge saving.

Referring to Fig. 7, the preparation method of sand core described in the present embodiment, comprising the following steps:

S1, sand core 1 design: according to the shape of sand core 1,1 threedimensional model of sand core are designed by modeling software, in sand core 1 Portion is equipped with a cavity 2, is equipped with sand removing hole 3 in 1 one end of sand core, sediment outflow piston 4 is equipped at sand removing hole 3, is set on sediment outflow piston 4 There is a gas vent 5；

Prepared by S2, sand core 1: preparing sand core 1 using 3DP resin sand by 3DP printing device；

S3,3 glue of sand removing hole envelope: sediment outflow piston 4 is blocked by sand removing hole 3 by heat-resistant adhesive.

The difference is that, the step of filling sand is discharged is eliminated, in this way, filling out for large-scale sand core with a upper embodiment The intensity of sand core can be increased by filling sand.

Embodiment 3 is the sectional view of the hollow sand cores for sand casting referring to Fig. 8, with upper embodiment difference It is that hollow grid shape is positive triangle shape.

This is used for the hollow sand cores preparation method of sand casting, identical as the method in embodiment 1, empties filling out in grid After filling sand, sediment outflow piston is blocked by sand removing hole by heat-resistant adhesive.

It is described above to be merely exemplary for the utility model, and not restrictive, those of ordinary skill in the art Understand, without departing from the spirit and scope defined by the claims, any modification, the variation or equivalent that can be made, Such as changing the shape of hollow grid, the quantity etc. of cavity is fallen within the protection scope of the utility model.

Claims (5)

1. a kind of sand core for sand casting comprising sand core ontology, which is characterized in that be equipped with cavity in the sand core internal (2), it is equipped at least one sand removing hole (3) in the sand core (1), be equipped at the sand removing hole (3) for blocking sediment ejection opening Sediment outflow piston (4)；The cavity (2) is in hollow grid (6) shape along the section of vertical sand removing hole axis direction.

2. a kind of sand core for sand casting according to claim 1, which is characterized in that the hollow grid (6) is positive Polygon latticed trellis.

3. a kind of sand core for sand casting according to claim 2, which is characterized in that the hollow grid (6) is positive Hexagonal mesh shape.

4. a kind of sand core for sand casting according to claim 2, which is characterized in that the sand removing hole is in outer end is big The outer end of small taper hole shape or the sand removing hole is held to be equipped with seam allowance；The shape of the sediment outflow piston is adapted to the sand removing hole.

5. a kind of sand core for sand casting according to claim 1, which is characterized in that set on the sediment outflow piston (4) There are a gas vent (5).