CN212371113U

CN212371113U - Novel sand core easy to crush, less in sand adhesion and good in casting performance

Info

Publication number: CN212371113U
Application number: CN201922397053.2U
Authority: CN
Inventors: 马小佳; 过海; 郭增均
Original assignee: Wanxiang Qianchao Co Ltd; Wanxiang Group Corp
Current assignee: Wanxiang Qianchao Co Ltd; Wanxiang Group Corp
Priority date: 2019-12-27
Filing date: 2019-12-27
Publication date: 2021-01-19
Anticipated expiration: 2029-12-27

Abstract

The utility model relates to a novel psammitolite that easy breakage, few sand sticking, casting performance are good mainly includes the psammitolite body, and the psammitolite body is upper and lower, is located the fashioned position department of upper and lower boss, is equipped with the recess, and it has the chill to inlay the cooperation in the recess, and the clearance intussuseption between recess and the chill is filled with the clay. The utility model discloses profitable effect is: the structure of the utility model can thoroughly solve the problem of sand sticking on the surface of the cavity of the swing arm cavity of the aluminum alloy auxiliary frame after casting and molding, and the sand core can be broken and removed easily after casting and molding; the swing arm boss is poor in forming effect, the problem of casting defects such as shrinkage cavities and air holes which often occur is also greatly improved, and the product percent of pass is greatly improved.

Description

Novel sand core easy to crush, less in sand adhesion and good in casting performance

Technical Field

The utility model relates to a psammitolite structure, especially a novel psammitolite that easy breakage, few clay, casting performance are good.

Background

As the upper boss and the lower boss are respectively arranged on the swing arm cavity of the aluminum alloy auxiliary frame, the sand core is crushed and removed after the cavity is molded by a sand mold, so that a desired cavity structure is obtained. The existing molding sand core of the swing arm cavity of the aluminum alloy auxiliary frame is formed by adding thermoplastic phenolic resin into precoated sand as a binder, adding a curing agent, a lubricant, an additive and the like, and then molding the core through a sand core mold and a core making machine. The existing sand core has the following problems: 1. the sand core is hard, the sand core is difficult to break away in the subsequent sand shaking process, the sand core can be broken away easily after the sand burning process is added, and the production process is complex. 2. The surface of the sand core is rough, aluminum liquid is in direct contact with the sand core in the low-pressure casting process of the aluminum auxiliary frame, sand sticking in the cavity of the swing arm is very serious, and parts with serious sand sticking sometimes can even interfere with normal assembly and use of the swing arm. 3. The sand core is prepared from coated sand, the boss in the cavity of the swing arm is poor in forming effect, and casting defects such as shrinkage holes and air holes often occur, so that the production yield of products is influenced finally.

Disclosure of Invention

The utility model discloses solve above-mentioned prior art's shortcoming, provide a novel psammitolite that easy breakage, few sand sticking, casting performance are good.

The utility model provides a technical scheme that its technical problem adopted: the novel sand core which is easy to break, less in sand bonding and good in casting performance mainly comprises a sand core body, wherein the upper surface and the lower surface of the sand core body are positioned at the positions of upper boss and lower boss forming, a groove is formed in the position, a chilling block is embedded and matched in the groove, and clay is filled in a gap between the groove and the chilling block.

The sand core body and the clay surface are coated with a layer of coating, and the thickness of the coating is within 0.3-0.8 mm.

The groove depth is 23mm, the bottom radius is 17.6mm, and the die drawing angle is 2 degrees.

The chilling block is 23mm high, the bottom radius is 17.4mm, and the inclination is 2 degrees.

The sand core body is an inorganic resin sand core prepared by matching inorganic raw sand with an inorganic curing agent.

The utility model discloses profitable effect is: the structure of the utility model can thoroughly solve the problem of sand sticking on the surface of the cavity of the swing arm cavity of the aluminum alloy auxiliary frame after casting and molding, and the sand core can be broken and removed easily after casting and molding; the swing arm boss is poor in forming effect, the problem of casting defects such as shrinkage cavities and air holes which often occur is also greatly improved, and the product percent of pass is greatly improved.

Drawings

FIG. 1 is a schematic view of the structure of the sand core body of the present invention;

FIG. 2 is a schematic sectional view A-A;

FIG. 3 is a schematic structural view of the present invention;

FIG. 4 is a schematic sectional view B-B.

Description of reference numerals: the sand core comprises a sand core body 1, a groove 2 and a chill 3.

Detailed Description

The present invention will be further explained with reference to the accompanying drawings:

as shown in the figure, the novel sand core which is easy to break, less in sand adhesion and good in casting performance mainly comprises a sand core body 1, wherein the sand core body 1 is an inorganic resin sand core made of inorganic raw sand and an inorganic curing agent. The sand core body 1 is provided with a groove 2 at the upper surface and the lower surface at the positions where the upper boss and the lower boss are formed, the depth of the groove 2 is 23mm, the bottom radius is 17.6mm, and the pattern drawing angle is 2 degrees. The groove 2 is internally embedded and matched with a chiller 3, the height of the chiller 3 is 23mm, the radius of the bottom of the chiller is 17.4mm, and the inclination is 2 degrees. The chilling block 3 can be made of iron or aluminum, and the chilling block 3 can be recycled for multiple times in the process of manufacturing and using the sand core. The gap between the groove 2 and the chilling block 3 is filled with clay. The sand core body 1 and the clay surface are coated with a layer of CTL712 coating, and the thickness of the coating is within 0.3-0.8 mm.

The utility model discloses change the tectorial membrane sand that the shaping psammitolite used (the molding sand that has covered one deck solid state resin membrane on the sand grain surface before molding, system core, core sand is called tectorial membrane sand, also called shell mould (core) sand) for inorganic former sand, the cooperation uses inorganic curing agent, and the preparation obtains the inorganic resin psammitolite. The collapsibility of the molding sand core is enhanced, so that the normal casting molding use of the sand core is not influenced in the low-pressure casting process, the sand core can be well broken and removed without a sand burning process after the low-pressure casting molding, the production cost is saved, and the complexity of the production process is reduced.

After the surface of the sand core is coated with a layer of coating, the performances of the surface of the sand core, such as heat resistance, chemical stability, molten metal scouring resistance, sand adhesion resistance and the like, can be improved, and the surface quality of a casting is improved. After the coating is coated, the surface defects of sand sticking, sand inclusion, sand holes, air holes and the like of the casting can be prevented, the surface quality of the casting is improved, the shakeout and cleaning workload is reduced, the labor environment is improved, the casting cost is reduced, and the economic benefit is improved.

The utility model discloses a psammitolite structure makes the swing arm cavity shaping accomplish the back easier get rid of by the breakage, and the sand-sticking problem of aluminium sub vehicle frame swing arm cavity internal surface is effectively solved, the casting defect problem etc. of boss position in the cavity is effectively solved.

In addition to the above embodiments, the present invention may have other embodiments. All the technical solutions formed by adopting equivalent substitutions or equivalent transformations fall within the protection scope claimed by the present invention.

Claims

1. The utility model provides a novel psammitolite that easy breakage, few adhesive sand, casting performance are good, mainly includes psammitolite body (1), characterized by: the sand core body (1) is positioned at the upper surface and the lower surface of the upper boss and the lower boss, the upper boss and the lower boss are formed, a groove (2) is formed, a cold iron (3) is embedded and matched in the groove (2), and clay is filled in a gap between the groove (2) and the cold iron (3).

2. The new sand core of claim 1, which is breakable, less sticky and has good castability, and which is characterized in that: the sand core body (1) and the clay surface are coated with a layer of coating, and the thickness of the coating is within 0.3-0.8 mm.

3. The new sand core of claim 1 or 2, which is breakable, less sticky and has good castability, and which is characterized in that: the depth of the groove (2) is 23mm, the radius of the bottom of the groove is 17.6mm, and the die drawing angle is 2 degrees.

4. The new sand core of claim 3, which is breakable, less sticky and has good castability, and which is characterized in that: the chilling block (3) is 23mm high, the bottom radius is 17.4mm, and the inclination is 2 degrees.

5. The new sand core of claim 1, which is breakable, less sticky and has good castability, and which is characterized in that: the sand core body (1) is an inorganic resin sand core prepared by matching inorganic raw sand with an inorganic curing agent.