CN212634225U

CN212634225U - Sand core with built-in gate

Info

Publication number: CN212634225U
Application number: CN202021841192.6U
Authority: CN
Inventors: 杨德军; 李艳君; 杨子建
Original assignee: Tangshan Xinye Technology Co ltd
Current assignee: Tangshan Xinye Technology Co ltd
Priority date: 2020-08-28
Filing date: 2020-08-28
Publication date: 2021-03-02
Anticipated expiration: 2030-08-28

Abstract

A sand core with a built-in gate comprises a resin sand core arranged in a sand mold, wherein a gate is arranged in the resin sand core, one end A of the gate arranged in the resin sand core is connected with a runner in the sand mold, the other end B of the gate is connected with a cavity of a malleable cast iron connecting piece, the cross section of the gate is arranged along the direction of a gate channel in a variable cross section mode, the gate channel is in a curve shape, and the other end B of the gate is positioned in an inner hole section area M to be processed of the cavity of the malleable cast iron connecting piece. The utility model discloses a position that resin sand psammitolite runner set up, the foundry goods terminal surface that has solved original existence is coarse, sand hole, runner department easily produces and lacks meat, stays defect such as stubble greatly, has improved the production efficiency of follow-up processing simultaneously.

Description

Sand core with built-in gate

Technical Field

The utility model relates to a casting runner structure, especially a psammitolite structure with built-in runner.

Background

At present, widely applied pipeline connecting pieces such as pipe hoops, movable joints, elbows, tees and the like are basically made of malleable iron castings (malleable steel), the pipeline connecting pieces such as the elbows, the tees and the like are mostly hollow castings, sand cores are placed during casting, and the sand cores are usually made of clay or water glass sand cores; the placement part of runner is established at the terminal surface of the annular oral area of foundry goods usually, this kind of casting mode has easily washed out the psammitolite when the foundry goods is poured, cause defects such as foundry goods surface roughness, sand hole, when foundry goods and runner separation, runner department easily produces and lacks defect such as meat or leaving stubbles big, need the process such as repair, polish of follow-up, just can become a qualified foundry goods, low in production efficiency, and still become the newspaper waste product easily, consequently improve traditional runner structure and become the urgent requirement that improves malleable iron pipe casting quality and improve production efficiency.

SUMMERY OF THE UTILITY MODEL

The utility model provides a psammitolite structure with built-in runner aims at the structure that is applicable to malleable cast iron pipe fitting casting runner position through optimal design to solve traditional runner and set up the position and produce sand eye, lack meat, stay the great problem of stubble to the casting end face, reach improvement casting end face quality, improve production efficiency's purpose.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

a sand core with a built-in gate comprises a resin sand core arranged in a sand mold, wherein a gate is arranged in the resin sand core, one end A of the gate arranged in the resin sand core is connected with a runner in the sand mold, the other end B of the gate is connected with a cavity of a malleable cast iron connecting piece, the cross section of the gate is arranged along the direction of a gate channel in a variable cross section manner, the gate channel is in a curve shape, the cross section area A-A of the gate A is larger than the cross section area B-B of the gate close to the cavity forming the malleable cast iron connecting piece, the position of the gate cross section area A-A is higher than the position of the gate cross section area B-B, and the other end B of the gate is positioned in an inner hole section area M to be processed.

In the sand core with the built-in gate, the part of the resin sand core connected with the runner is provided with the arc chamfer R.

In the sand core with the built-in pouring gate, the molten metal liquid enters a cavity of the malleable cast iron connecting piece formed by the sand mold and the resin sand core through the runner and the pouring gate.

The resin sand core is a thin-wall hollow core or a solid core.

The wall thickness delta of the thin-wall hollow sand core is the wall thickness delta of the sand core provided with the built-in gate₀And (8) = (1/2-1/4) delta, wherein delta is the thickness of the casting.

The utility model relates to a sand core structure with built-in pouring gate, especially suitable for casting the foundry goods of hollow container or pipe connection spare, the pouring gate position of the malleable cast iron pipe connection spare is changed from the position originally set up in the end face of the cast hole, to the hole section area M to be processed in the die cavity of the malleable cast iron connection spare, change the original clay or water glass sand core into the resin sand core, solved and easily washed out the sand core, caused the surface of the foundry goods to be rough, when sand eye and foundry goods separate from runner, the pouring gate department easily produces and lacks defects such as meat or leaving stubbles big; meanwhile, in the subsequent cutting process, the stubbles at the sprue can be cut off, so that the production efficiency is improved, and the quality of the orifice end face of the connecting piece of the malleable cast iron pipeline is also ensured.

Drawings

FIG. 1 is a schematic view of the structure of a product made by the present invention;

fig. 2 is a schematic structural diagram of the present invention;

FIG. 3 is a schematic view of a portion of the enlarged structure at E in FIG. 2;

FIG. 4 is a schematic structural diagram of an original gate arrangement;

in the drawings, the reference numerals denote: 1. the method comprises the following steps of sand mold 2, resin sand core 3, runner 4, sprue 5, cavity 6, sprue sectional area B-B, sprue sectional area A-A, sprue sectional area 8, arc chamfer R, 9, clay or water glass sand core 10 and external sprue.

A. And at the gate, the gate B and the inner hole section area to be processed M.

Detailed Description

The present invention will be further described with reference to the accompanying drawings and specific embodiments.

Referring to fig. 1, the utility model discloses a tee bend malleable cast iron connecting piece is taken as an example, be equipped with runner 4 in resin sand psammitolite 2, the resin sand psammitolite that set up in sand mould 1, runner 3 in sand mould 1 is connected to runner 4 one end that sets up in resin sand psammitolite 2, and the other end forms the die cavity 5 of malleable cast iron connecting piece with sand mould 1 and resin sand psammitolite 2 and is connected, and runner 4's shape is for having certain radian, and runner 4 sectional area A-A who is close to the runner 3 direction of injection is greater than the runner sectional area B-B who is close to the die cavity that forms malleable cast iron connecting piece, and runner sectional area A-A position is higher than runner sectional area B-B, and the metal of liquid is by runner top-down's inflow malleable.

Still refer to fig. 1, fig. 2, fig. 3, the resin sand core 2 of the utility model is provided with a circular arc chamfer R in the shape of the resin sand core 2 at the inlet part of the runner 3, R = 3-8 mm, the circular arc chamfer is arranged to reduce the flow resistance of the molten metal during pouring on the one hand, so that the liquid metal is stably and rapidly filled into the mold, and the molten metal enters the sand mold 1 through the runner 3 and the pouring gate to form the cavity of the malleable cast iron connecting piece with the resin sand core 2; on the other hand, the resin sand core 2 at the position can be prevented from being broken when being poured, the shape of the resin sand core 2 is made into a hollow sand core or a solid sand core with certain wall thickness according to the nominal diameter of the cavity 5 of the malleable cast iron connecting piece, and the hollow sand core has the advantages of saving raw materials of the sand core, good air permeability when being poured, easy sand removal and the like.

Referring to fig. 1, 2, 3 and 4, clay or water glass sand cores 9 are mostly adopted in sand cores for casting malleable cast iron connecting pieces in the prior art, the pouring gate is an external pouring gate 10, the external pouring gate is arranged on the end face of the annular opening of the casting, the clay or water glass sand cores 9 are easily broken during casting and pouring, the defects of rough surface, sand holes and the like of the casting are caused, meat or stubbles are lost when the casting is separated from a flow passage, the casting is scrapped due to the meat loss, the stubbles are large, the procedures of polishing, filing and the like need to be added in the subsequent process, and the post-processing cost is high. In the design method, the position of the sprue 4 is arranged in an inner hole section area M to be processed of a cavity of the malleable cast iron pipe connecting piece, the inner hole section area M is in a subsequent stage of further cutting processing, the malleable cast iron pipe connecting piece is generally provided with external threads or internal threads according to different purposes of the connecting piece, if the inner threads are used, the sprue left on a casting is cut and processed incidentally when the inner threads are processed, if the inner threads are used, the sprue left on the casting is not large, and the inner diameter of the malleable cast iron pipe connecting piece is not influenced in appearance and small in stubble so as not to influence the use, so that the later processing cost is reduced, the cost is reduced, and the production rate is improved.

The utility model discloses a resin sand psammitolite of built-in runner has replaced the position that conventional runner set up, has solved the casting surface roughness that originally exists, husky eye, runner department easily produce lack meat, leave the big class defect of stubble, has reached improvement foundry goods yields, reduction in production cost's purpose.

Claims

1. A sand core with a built-in gate is characterized in that: comprises a resin sand core (2) arranged in a sand mould (1), a sprue (4) arranged in the resin sand core (2), a position A of one end of a pouring gate (4) arranged in the resin sand core (2) is connected with a runner (3) in a sand mold, a position B of the other end of the pouring gate (4) is connected with a cavity (5) of the malleable cast iron connecting piece, the cross section of the pouring gate (4) is arranged in a variable cross section mode along the channel direction of the pouring gate (4), the channel of the pouring gate (4) is in a curve shape, the sectional area A-A of the pouring gate (4) position is larger than the sectional area B-B of the pouring gate (4) close to the cavity (5) forming the malleable cast iron connecting piece, the position of the sectional area A-A of the pouring gate (4) is higher than the position of the sectional area B-B of the pouring gate (4), and the position B of the other end of the pouring.

2. The sand core provided with a built-in gate of claim 1, wherein: and an arc chamfer R (8) is arranged at the connecting part of the resin sand core (2) and the runner (3).

3. The sand core provided with a built-in gate of claim 1, wherein: the resin sand core (2) is a thin-wall hollow sand core or a solid sand core.

4. The sand core provided with a built-in gate of claim 3, wherein: the wall thickness delta of the thin-wall hollow sand core₀And (8) = (1/2-1/4) delta, wherein delta is the thickness of the casting.