CN217018453U

CN217018453U - Molding sand capable of improving surface smoothness of casting

Info

Publication number: CN217018453U
Application number: CN202123380983.0U
Authority: CN
Inventors: 不公告发明人
Original assignee: Jiangsu Hongbaiyi New Material Technology Co ltd
Current assignee: Jiangsu Hongbaiyi New Material Technology Co ltd
Priority date: 2021-12-30
Filing date: 2021-12-30
Publication date: 2022-07-22
Anticipated expiration: 2031-12-30

Abstract

The utility model provides a molding sand for improving the surface smoothness of a casting, which comprises a spherical body and micro powder particles fixed on the spherical body, wherein the particle size of the spherical body is 50-100 mu m, the micro powder particles are fixed on the outer side of the spherical body through a resin layer, the spherical body comprises an inner sand layer, a fibrosis layer and an oxidation metal layer, the fibrosis layer surrounds the inner sand layer, the oxidation metal layer surrounds the outer surface of the fibrosis layer, and the outer surface of the oxidation metal layer is coated with the resin layer. The micro powder particles are ceramic fiber powder or graphite powder, and are not easy to burn under the high-temperature effect, and the generated gas causes the surface of the casting to have air holes, so that the smoothness of the surface of the casting is improved, the smoke pollution is avoided, and the cost of smoke treatment in the casting process is reduced.

Description

Molding sand capable of improving surface smoothness of casting

Technical Field

The utility model relates to the technical field of alloy casting, in particular to molding sand for improving the surface smoothness of a casting.

Background

The function of the molding sand in the casting production is very important, and casting waste products caused by poor quality of the molding sand account for about 30-50% of total casting waste products. The molding sand in the prior art mainly has the following problems: the material diameter of the first existing molding sand is too large, so that the air permeability is good in the casting process of a casting, but the surface of the casting is easy to be rough and the smoothness is poor; secondly, the existing molding sand is often added with coal dust in order to improve the collapsibility of the molding sand, but the coal dust is combusted at high temperature in the casting process to generate gas, so that air holes and the like exist on the surface of a casting, the cleanliness of the surface of the casting is further reduced, and meanwhile, smoke released by combustion of the coal dust needs to be discharged after purification treatment, so that the cost of the casting is increased.

SUMMERY OF THE UTILITY MODEL

In view of the above problems, the present invention provides a molding sand that improves the surface smoothness of a casting.

In order to realize the purpose, the utility model adopts the following technical scheme: the molding sand for improving the surface smoothness of the casting comprises a spherical body and micro powder particles fixed on the spherical body, wherein the particle size of the spherical body is 50-100 mu m, and the micro powder particles are fixed on the outer side of the spherical body through a resin layer.

Preferably, the spherical body comprises an inner sand layer, a fiberization layer and a metal oxide layer, wherein the fiberization layer surrounds the inner sand layer, the metal oxide layer surrounds the outer surface of the fiberization layer, and the outer surface of the metal oxide layer is coated with a resin layer.

Preferably, the particle size of the micropowder particles is not more than 5 μm, and the micropowder particles are spherical particles or polyhedral particles.

Preferably, the micro powder particles are ceramic fiber powder or graphite powder, and the micro powder particles are spherical particles, tetrahedral particles or hexahedral particles.

Preferably, the metal oxide layer is a titanium dioxide layer.

Preferably, the outer surface of the fiberized layer is a rough surface.

Preferably, the inner sand layer is a water glass sand layer or a quartz sand layer.

Preferably, the spherical body is provided with at least 8 micro powder particles.

Preferably, the micro powder particles are uniformly distributed on the outer surface of the spherical body, and the distances between two adjacent micro powder particles are the same.

Compared with the prior art, the utility model has the beneficial effects that: (1) the spherical body is small in particle size, the particle size of micro powder particles on the spherical body is smaller relative to the spherical body, the flowability of the micro powder particles outside the spherical body is guaranteed when the micro powder particles are bonded, when bonded molding sand is used as a casting mold, all molding sand particles are spaced through the micro powder particles, gaps are formed among all molding sand particles, and when the bonded molding sand is used, the mold made of the molding sand particles has good air permeability, the particle size of the micro powder particles is small, the gaps among the molding sand particles are small, so that the uneven surface of a casting caused by the large particle size of the molding sand particles is avoided, and the smooth finish of the surface of the casting is improved. (2) The micro powder particles are ceramic fiber powder or graphite powder, so that the molding sand particles are easy to collapse and fall off from the casting after being used, the micro powder particles are not easy to burn under the high-temperature effect, and the generated gas causes the surface of the casting to have air holes, so that the smoothness of the surface of the casting is improved, the smoke pollution is avoided, and the cost of smoke treatment in the casting process is reduced. And (3) the outer surface of the fibrosis layer is a rough surface. Guarantee to be connected between oxidation metal level and the fibrous layer firmly, avoid oxidation metal level and fibrous layer surface to break away from, lead to the oxidation metal level to peel off for the molding sand bears the high temperature ability and descends, leads to inlayer sand thermal expansion, makes the foundry goods surface produce unevenness's phenomenon, thereby can improve the smooth finish on foundry goods surface.

Drawings

FIG. 1 is a schematic perspective view of a molding sand for improving the surface finish of a casting according to the present invention;

fig. 2 is a schematic cross-sectional view of the molding sand for improving the surface finish of a casting according to the present invention.

Detailed Description

In order to further understand the objects, structures, features and functions of the present invention, the following embodiments are described in detail.

Referring to fig. 1 and 2, the molding sand for improving the surface finish of a casting according to an embodiment of the present invention includes a spherical body 100 and micro powder particles 200 fixed on the spherical body, wherein the particle size of the spherical body 100 is 50 μm to 100 μm, and the particle size of the spherical body 100 is smaller, so as to avoid the phenomena of rough surface and poor finish of the casting during casting. The fine powder particles 200 are fixed to the outer side of the spherical body 100 through a resin layer 300. Spherical body 100 provides the guarantee for the molding sand mobility in the use, and the spherical body 100 outside has micro powder particle 200 through resin layer 300 bonding simultaneously, guarantees that the molding sand easily bonds in the use and makes the molding of foundry goods.

The spherical body 100 comprises an inner sand layer 101, a fiberization layer 102 and an oxidation metal layer 103, wherein the fiberization layer 102 surrounds the inner sand layer 101, the inner sand layer 101 is a water glass sand layer or a quartz sand layer, and the inner sand layer 101 has good strength and can bear the action of external force. The oxidized metal layer 103 surrounds the outer surface of the fiberization layer 102, the outer surface of the oxidized metal layer 103 is coated with a resin layer 300, and the resin layer 300 can be a resin layer 300 made of furan resin or phenolic resin, so that the sand particles are easy to bond when in use.

The particle size of the micro powder particles 200 is not more than 5 μm, the particle size of the micro powder particles 200 is smaller than that of the spherical body 100, so that the micro powder particles 200 can still have fluidity when being bonded outside the spherical body 100, and the micro powder particles 200 are spherical particles or polyhedral particles. The micro powder particles 200 are spherical particles, tetrahedral particles or hexahedral particles. The spherical body 100 is provided with at least 8 micro powder particles 200. The micro powder particles 200 are uniformly distributed on the outer surface of the spherical body 100, and the distance between two adjacent micro powder particles 200 is the same. When the molding sand is used as a casting mold, and the molding sand is bonded, the molding sand particles are spaced through the micro powder particles 200, so that gaps are formed among the molding sand particles, and when the molding sand is used, the mold made of the molding sand particles has good air permeability, the particle size of the micro powder particles 200 is small, the gaps among the molding sand particles are small, so that the condition that when the particle size of the molding sand particles is large, the surface of a casting is uneven is avoided, and the surface smoothness of the casting is improved. The micro powder particles 200 are ceramic fiber powder or graphite powder, so that the molding sand particles are easy to collapse and fall off from a casting after being used, the micro powder particles 200 are not easy to combust under the action of high temperature, and gas is generated to cause the surface of the casting to have air holes, so that the smoothness of the surface of the casting is improved, the smoke pollution is avoided, and the cost of smoke treatment in the casting process is reduced.

The oxidized metal layer 103 is a titanium dioxide layer. The spherical body 100 is externally provided with the oxidation metal layer 103, so that the phenomenon that the surface of the molding sand is oxidized with a casting at high temperature in the casting process to influence the quality of the casting is avoided, and the titanium dioxide layer has good heat insulation performance, so that the molding sand particles can bear high temperature action and have good strength.

The outer surface of the fiberization layer 102 is a rough surface. Guarantee to be connected between oxidation metal layer 103 and the fibrous layer 102 firmly, avoid oxidation metal layer 103 and fibrous layer 102 surface to break away from, lead to oxidation metal layer 103 to peel off for the molding sand bears the high temperature ability and descends, leads to inlayer sand 101 thermal expansion, makes the foundry goods surface produce unevenness's phenomenon.

The present invention has been described in relation to the above embodiments, which are only exemplary of the implementation of the present invention. It should be noted that the disclosed embodiments do not limit the scope of the utility model. Rather, it is intended that all such modifications and variations be included within the spirit and scope of this invention.

Claims

1. The molding sand for improving the surface finish of the casting is characterized in that: the spherical micro powder particle structure comprises a spherical body and micro powder particles fixed on the spherical body, wherein the particle size of the spherical body is 50-100 mu m, and the micro powder particles are fixed on the outer side of the spherical body through a resin layer.

2. The molding sand for improving the surface finish of a casting according to claim 1, wherein: the spherical body comprises an inner sand layer, a fiberization layer and an oxidized metal layer, wherein the fiberization layer surrounds the inner sand layer, the oxidized metal layer surrounds the outer surface of the fiberization layer, and the outer surface of the oxidized metal layer is coated with a resin layer in a wrapping mode.

3. The molding sand for improving the surface finish of a casting according to claim 1, wherein: the particle size of the micro powder particles is not more than 5 mu m, and the micro powder particles are spherical particles or polyhedral particles.

4. The molding sand for improving the surface finish of a casting according to claim 3, wherein: the micro powder particles are ceramic fiber powder or graphite powder, and the micro powder particles are spherical particles, tetrahedral particles or hexahedral particles.

5. The molding sand for improving the surface finish of a casting according to claim 2, wherein: the oxidized metal layer is a titanium dioxide layer.

6. The molding sand for improving the surface smoothness of castings according to claim 2, wherein: the outer surface of the fibrosis layer is a rough surface.

7. The molding sand for improving the surface smoothness of castings according to claim 2, wherein: the inner sand layer is a water glass sand layer or a quartz sand layer.

8. The molding sand for improving the surface finish of a casting according to claim 1, wherein: the spherical body is provided with at least 8 micro powder particles.

9. The molding sand for improving the surface finish of a casting according to claim 8, wherein: the micro powder particles are uniformly distributed on the outer surface of the spherical body, and the distance between every two adjacent micro powder particles is the same.