CN213888061U

CN213888061U - Novel precoated sand core

Info

Publication number: CN213888061U
Application number: CN202022880689.5U
Authority: CN
Inventors: 郭威; 唐世兵
Original assignee: Jiangsu Jingda Intelligent Equipment Co ltd
Current assignee: JIANGSU YAWEI FOUNDRY MATERIAL TECHNOLOGY Co.,Ltd.
Priority date: 2020-12-02
Filing date: 2020-12-02
Publication date: 2021-08-06
Anticipated expiration: 2030-12-02

Abstract

The utility model discloses a novel precoated sand core, which comprises a precoated sand core and a hollow channel positioned inside the precoated sand core, wherein the inner wall of the hollow channel is provided with a vertical groove and a horizontal groove, the vertical groove and the horizontal groove are arranged at the position with the maximum contractive force of the hollow channel, the position easy to generate flaws and the position firstly solidified, a structural weak area can be formed by slotting the inside of the precoated sand core, the general slotting part is positioned at the place with the maximum contractive force, the place easy to generate flaws and the corresponding casting position firstly solidified, and can be slotted according to the composition of the casting inner space and the contraction direction, the length, the size and the number of the slotting are referenced by the size of the inner space and the solidification time of the casting, the utility model can ensure that the intensity of the slotting part of the precoated sand core on the whole is lower than the contractive force when molten steel is solidified by arranging the horizontal groove and the vertical groove, so that the casting does not encounter resistance higher than the shrinkage force to cause flaws when solidified.

Description

Novel precoated sand core

Technical Field

The utility model relates to a tectorial membrane sand casting technical field specifically is a novel tectorial membrane sand psammitolite.

Background

The speed of the prior precoated sand casting is far faster than that of the prior sand casting when the prior precoated sand casting is produced by mass casting. However, the sand core is high in strength compared with the old loose sand casting, the collapse speed is limited by time, and when hollow products such as tubular products and the like are produced, the collapse is not timely, so that the solidification contraction pressure of the casting cannot be released, flaws (hidden cracks and cracks) are generated, and some products are even directly scrapped, so that the yield of the products is reduced, and steel materials and electric energy are wasted.

Based on this, the utility model designs a novel tectorial membrane sand psammitolite to solve the problem of this kind of qualification rate when having the cavity product of batch tectorial membrane sand casting.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a novel tectorial membrane sand psammitolite to solve the above-mentioned problem of mentioning.

In order to achieve the above object, the utility model provides a following technical scheme: the utility model provides a novel tectorial membrane sand psammitolite, includes tectorial membrane sand psammitolite and is located the inside cavity passageway of tectorial membrane sand psammitolite, the inner wall of cavity passageway is opened has perpendicular groove and cross slot, erect groove and cross slot set up in the position that cavity passageway contractile force is the biggest, the position of flaw appears easily and the position that solidifies first.

Preferably, at least one vertical groove and at least one transverse groove are formed in each vertical groove and each transverse groove.

Preferably, the length, size and number of the vertical and horizontal grooves are determined according to the size of the hollow passage and the solidification time of the casting.

Preferably, the vertical slots and the transverse slots are arranged perpendicular to each other.

Compared with the prior art, the beneficial effects of the utility model are that: the utility model discloses a set up the transverse groove and erect the groove and can make tectorial membrane sand psammitolite on the whole fluting position intensity be less than the contractile force when the molten steel solidifies to thereby make the foundry goods can not meet the resistance that is higher than the contractile force when solidifying and cause the flaw.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without creative efforts.

FIG. 1 is a schematic structural view of the present invention;

fig. 2 is a schematic top view of the present invention;

fig. 3 is a schematic view of the present invention.

In the drawings, the components represented by the respective reference numerals are listed below:

1. coating a sand core; 2. a hollow channel; 3. a vertical slot; 4. a transverse groove.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by a person of ordinary skill in the art without creative efforts belong to the protection scope of the present invention.

Referring to fig. 1-2, the present invention provides a technical solution: the utility model provides a novel tectorial membrane sand psammitolite, includes tectorial membrane sand psammitolite 1 and is located 1 inside cavity passageway 2 of tectorial membrane sand psammitolite, the inner wall of cavity passageway 2 is opened there are perpendicular groove 3 and cross slot 4, perpendicular groove 3 and cross slot 4 set up in 2 maximum positions of contractile force of cavity passageway, the position of flaw appears easily and the position that solidifies first

The precoated sand core 1 is an internal precoated sand shell support and is used for combining with an external coated sand shell to form a complete valve body cavity. The inside of the precoated sand core 1 is grooved, a structural weak area can be formed, the general grooving position is in a place with the largest shrinkage force, a place which is easy to have flaws in the prior art and a casting position which is corresponding to the place and is solidified firstly, meanwhile, the grooving position can be formed by more than one groove, grooving can be performed according to the composition and shrinkage direction of the internal space of the casting, and the length, size and number of the grooving can be properly shortened and reduced by taking the size of the internal space and the solidification time of the casting as references.

The specific working principle is as follows:

the strength of the whole grooving part of the precoated sand core 1 can be lower than the shrinkage force of the solidified molten steel by arranging the transverse grooves 4 and the vertical grooves 3, so that the casting cannot encounter resistance higher than the shrinkage force to cause flaws during solidification. As shown in fig. 3, when the sand-coated sand core 1 is in molten steel, the metal material shrinks during solidification, so that shrinkage during casting is inevitable, and casting sand, particularly the coated sand, has high rigidity and is not easily expanded by heat or contracted by cold, so that resistance is generated to shrinkage of the steel casting, and the resistance causes flaws. After the tectorial membrane sand psammitolite 1 was provided with transverse groove 4 and perpendicular groove 3, its transverse groove 4 just is the position that psammitolite structural strength is minimum with perpendicular 3 bottoms in groove, receives the steel part shrink power after the current psammitolite structure just makes the psammitolite atress collapse more easily. Thereby ensuring smooth shrinkage of the casting.

The utility model has the same usage as the prior sand core,

when a casting sand mold is manufactured, grooves with different depths and the number are prefabricated in the casting sand mold according to the size of the sand core, and when molten steel is poured and solidified, the grooving position of the sand core is firstly collapsed due to low strength, so that the metal structure cannot generate flaws due to strong shrinkage resistance.

Taking a steel valve casting as an example, all the existing sand core manufacturing methods do not have grooves, and as a result, the defects in the valve casting need to be inspected after casting, and then the defects are treated, so that the discarded steel casting is poor in treatment and can be discarded, and because the discarded steel casting contains impurities (oxides, sand grains and the like) during casting, the impurities can not be directly reused and can only be treated as scrap iron. Thus causing a great deal of waste. After the grooving is carried out, the inner part of the sand core is provided with a place with weak stress resistance, and the sand core can be firstly collapsed when the sand core is subjected to the contraction pressure of the steel piece, so that the contraction of the casting cannot be subjected to large resistance to cause flaws.

In the description herein, references to the description of "one embodiment," "an example," "a specific example," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The preferred embodiments of the present invention disclosed above are intended only to help illustrate the present invention. The preferred embodiments are not intended to be exhaustive or to limit the invention to the precise embodiments disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and its practical applications, to thereby enable others skilled in the art to best understand the invention for and utilize the invention. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. The utility model provides a novel tectorial membrane sand psammitolite which characterized in that: including tectorial membrane sand psammitolite (1) and being located cavity passageway (2) inside tectorial membrane sand psammitolite (1), the inner wall of cavity passageway (2) is opened has perpendicular groove (3) and horizontal groove (4), perpendicular groove (3) and horizontal groove (4) set up in the position that cavity passageway (2) contractile force is the biggest, the position that the flaw appears easily and the position that solidifies at first.

2. The novel precoated sand core of claim 1, characterized in that: at least one vertical groove (3) and at least one transverse groove (4) are arranged.

3. The novel precoated sand core of claim 1, characterized in that: the length, the size and the number of the vertical grooves (3) and the transverse grooves (4) are determined according to the size of the hollow channel (2) and the solidification time of the casting.

4. The novel precoated sand core of claim 1, characterized in that: the vertical groove (3) and the transverse groove (4) are perpendicular to each other.