CN215879750U - Heat-preservation riser sleeve device for metal casting mold - Google Patents

Abstract

The utility model discloses a heat-preservation riser bush device for a metal casting mold, which comprises a riser bush detachably arranged on the casting mold, wherein the riser bush comprises a base and a ring wall body connected with the base, a first cavity for holding molten metal is enclosed by the ring wall body, and an ejector rod for ejecting a casting in the first cavity is penetrated by the riser bush. The utility model fully utilizes the principle of heat conductivity difference in heat transfer, has very high heat insulation performance, and has no shrinkage porosity defects inside the casting after use. The casting has stable quality, can be installed in place at one time without replacement every time, can be used for a long time in the service life of metal materials, and has lower cost and high efficiency.

Description

Heat-preservation riser sleeve device for metal casting mold

Technical Field

The utility model relates to the field of casting molds, in particular to a heat-insulating riser sleeve device for a metal casting mold.

Background

The metal casting mold can be divided into a gravity casting mold and a low-pressure casting mold according to different casting modes, namely a process of manufacturing a mold cavity by using mold steel, injecting metal liquid into the mold cavity, and forming a casting after the metal liquid is cooled and solidified.

The casting usually has a relatively thick part called as a casting thermal node, which has a slow solidification speed and is easy to generate shrinkage porosity defects under the condition of insufficient feeding. The process solves the problem that a riser cavity is arranged at a hot spot part, and the molten metal in the riser cavity needs to be later than the solidification speed of the hot spot part, namely the molten metal in the riser cavity is used for supplementing the shrinkage requirement of the hot spot part, thereby achieving the purpose of eliminating the casting defect. The core condition is that the oral cavity has good heat preservation, and the common treatment modes of the oral cavity at present comprise a layer of thick fiber paste heat preservation layer coated by hands, a disposable riser sleeve made of heating materials, a disposable riser sleeve made of sand cores with lower heat conductivity and the like.

The existing common treatment modes of the cap mouth have some defects, the manual coating of the cap mouth heat-insulating layer has higher requirements on manual operation skills, the heat-insulating layer has low strength, and the cap mouth heat-insulating layer is easy to damage and fall off in the production process, so that the quality of a casting is unstable; the disposable riser sleeve made of the heating material needs to be ordered to a professional casting auxiliary material factory, so that the cost is high; the disposable riser sleeve made of the sand core needs to be additionally made into a core box die, so that the production efficiency is low and the cost is high.

SUMMERY OF THE UTILITY MODEL

Aiming at the technical problems existing in the prior stage, the utility model aims to provide an insulating riser sleeve device for a metal casting mold.

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

the utility model provides a metal casting mould is with heat preservation riser bush device, is including dismantling the riser bush that sets up on casting mould, riser bush include the base and with the rampart body of base connection, the rampart body enclose into the first die cavity that is used for placing the molten metal, riser bush wear to establish and be used for the ejecting ejector pin of foundry goods in the first die cavity.

Furthermore, the section of the first cavity is trapezoidal, and the wall thickness of the annular wall body is 1.5-3.5 mm.

Furthermore, a closed heat insulation layer is arranged between the riser bush and the casting mould.

Further, the closed heat insulation layer is arranged outside the annular wall body.

Specifically, the base and the ejector rod are axially provided with a plurality of vent plugs in parallel.

Furthermore, the diameter of the vent plug is 8-14 mm, and the width of a vent gap on the vent plug is 0.15-0.2 mm.

Specifically, the base is connected with the casting mold through a plurality of fixing bolts.

Preferably, the wall thickness of the annular wall body is 2 mm.

Preferably, the width of the exhaust gap on the exhaust plug is 0.15 mm.

Compared with the prior art, the utility model has the following beneficial effects:

according to the heat-insulation riser sleeve device for the metal casting mold, the heat insulation mode fully utilizes the principle of heat conductivity difference in heat transfer, the heat insulation performance is very high, and the interior of a casting does not have any shrinkage porosity defects after use. The casting has stable quality, can be installed in place at one time without replacement every time, can be used for a long time in the service life of metal materials, and has lower cost and high efficiency.

Drawings

The accompanying drawings, which are included to provide a further understanding of the disclosure and are incorporated in and constitute a part of this specification, illustrate embodiments of the disclosure and together with the description serve to explain the disclosure without limiting the disclosure. In the drawings:

FIG. 1 is a top view of an assembly structure of a heat-insulating riser bush device for a metal casting mold;

in the drawings, the various reference numbers indicate:

1. a first cavity; 2. casting a mold; 3. sealing the heat insulation layer; 4. a riser sleeve; 41. a base; 42. a ring wall body; 5. a vent plug; 6. fixing the bolt; 7. a top rod; 8. a second cavity.

Detailed Description

It should be noted that the terms "upper end", "lower end", and the like, when describing an orientation, are merely used to facilitate describing the utility model and to simplify the description, and do not indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation. If the particular gesture changes, the directional indication changes accordingly. In the present invention, unless otherwise expressly stated or limited, the terms "connected," "secured," and the like are to be construed broadly, and for example, "secured" may be a fixed connection, a removable connection, or an integral part; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

The materials selected for the closed heat insulation layer comprise heat insulation materials with low heat conductivity, such as refractory fiber paste or asbestos, and the heat insulation materials are common heat insulation materials in the market.

The following detailed description of specific embodiments of the present disclosure is provided in connection with the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the present disclosure, are given by way of illustration and explanation only, not limitation.

Example 1

Referring to fig. 1, the present embodiment provides an insulating riser bush device for a metal casting mold, and an application scenario includes a metal gravity casting mold or a low-pressure casting mold. Including dismantling riser bush 4 that sets up on casting mould 2, riser bush 4 includes base 41 and the rampart body 42 of being connected with base 41, and rampart body 42 encloses into the first die cavity 1 that is used for placing the molten metal, and riser bush 4 wears to establish ejector pin 7 that is used for the foundry goods ejecting in the first die cavity 1. The ejector rod 7 is used for ejecting the riser together with the casting after the casting is solidified, so that the possibility of deformation of the casting due to large demoulding resistance at the riser is prevented. Specifically, the base 41 is provided at the outer bottom end of the casting mold.

The material of the riser bush 4 adopts hot die steel (H13 steel or SKD61 steel), is manufactured by a mechanical processing mode, and is subjected to heat treatment to improve the strength.

Furthermore, the section shape of the first cavity 1 is trapezoidal, the first cavity 1 is the cavity for casting the riser, the specific size and shape can be adjusted according to different types of castings, the second cavity 8 connected with the first cavity 1 is the cavity for the casting body, and the molten metal in the first cavity 1 can be supplemented to the second cavity 8 under the action of gravity in the casting solidification process, so that the shrinkage porosity defect is eliminated.

The riser bush 4 has excellent heat insulation performance, the wall thickness of the ring wall body 42 is 1.5-3.5 mm, the arrangement of the riser bush 4 can furthest reduce the heat absorption capacity of the riser bush 4 while maintaining the basic strength, prevent the heat of the molten metal in the first cavity 1 from being excessively absorbed,

further, a closed heat insulation layer 3 is arranged between the riser bush 4 and the casting mould 2. The closed heat insulation layer 3 can be made of heat insulation materials with low heat conductivity, such as refractory fiber paste or asbestos, and the heat insulation capability of the riser sleeve 4 is further enhanced. The closed thermal insulation layer 3 is arranged outside the annular wall body 42, and mainly fills the space between the annular wall body 42 and the casting mold 2.

Specifically, the base 41 and the ejector rod 7 are axially provided with a plurality of vent plugs 5 in parallel, and the vent plugs are used for exhausting air when the first cavity 1 is filled with molten metal, so that the riser is ensured to be completely filled.

Furthermore, the diameter of the vent plug 5 can be 8-14 mm according to requirements, and the width of a vent gap on the vent plug 5 is 0.15-0.2 mm.

Specifically, the base 41 and the casting mold 2 are connected by a plurality of fixing bolts 6. The number of fixing bolts 6 may be 2 as illustrated.

In a preferred version of this embodiment, the annular wall 42 has a wall thickness of 2 mm.

In a preferred embodiment of the present embodiment, the width of the vent slit on the vent plug 5 is 0.15 mm.

This metal casting mould 2 is with heat preservation riser bush 4 device uses ordinary hot work die steel preparation, and structural design's thermal-insulated thermal insulation performance is very high-efficient, and the inside no shrinkage porosity class defect of back foundry goods of using. The riser cavity is not required to be manually coated with a fiber paste heat-insulating layer, and is not required to be replaced every time (comprising a heat-insulating material in a closed cavity, the riser cavity is not directly contacted with molten metal due to the closing, the riser cavity can not be burnt, and the riser cavity can not fall off due to the hoisting and overturning of a die), so that the service life is long (about 3-5 ten thousand times), the cost is low, and the efficiency is high.

In conclusion, the device for the heat-preservation riser bush 4 for the casting mould 2 has the following implementation process:

1. the shape and the size of the first cavity 1 are designed according to specific casting needs to form a drawing, and hot-working die steel materials are used for processing.

2. The manufactured riser bush 4 is installed in the casting mould 2, a cavity between the riser bush 4 and the casting mould 2 is filled with a closed heat insulation layer 3, and the riser bush 4 and the casting mould 2 are locked and fixed by a fixing bolt 6.

3. According to a normal casting process, a layer of casting coating with the thickness of 0.1-0.2 mm is sprayed in the first cavity 1 and the second cavity 8.

4. In the casting process, the first cavity 1 and the second cavity 8 are gradually filled with molten metal, air in the cavities is discharged along the vent plugs 5, but the molten metal cannot pass through the cavities, and therefore the riser is guaranteed to be completely filled.

5. In the process of casting solidification, because of the excellent heat preservation and heat insulation performance of the riser bush 4, the solidification speed of the molten metal in the first cavity 1 is later than that of the molten metal in the second cavity 8, and the feeding effect is ensured.

6. After the casting is completely solidified and cooled, the riser and the casting are ejected out together through the ejector rod 7, and the casting is stressed uniformly and cannot deform.

7. And 4-6 steps are repeated to continuously produce the casting.

8. After one round of production is finished, the process of the third step is repeated to prepare the die again, the next round of production is prepared, and the riser bush 4 comprises the materials in the closed heat insulation layer 3, and does not need to be taken down and replaced within the service life (about 3 to 5 ten thousand die times).

The preferred embodiments of the present disclosure are described in detail with reference to the accompanying drawings, however, the present disclosure is not limited to the specific details of the above embodiments, and various simple modifications may be made to the technical solution of the present disclosure within the technical idea of the present disclosure, and these simple modifications all belong to the protection scope of the present disclosure.

It should be noted that, in the foregoing embodiments, various features described in the above embodiments may be combined in any suitable manner, and in order to avoid unnecessary repetition, various combinations that are possible in the present disclosure are not described again.

In addition, any combination of various embodiments of the present disclosure may be made, and the same should be considered as the disclosure of the present disclosure, as long as it does not depart from the spirit of the present disclosure.

Claims (9)

1. The utility model provides a metal casting mould is with heat preservation rising head cover device, its characterized in that, is including dismantling riser bush (4) of setting on casting mould (2), riser bush (4) include base (41) and the ring wall body (42) of being connected with base (41), ring wall body (42) enclose into first die cavity (1) that is used for placing the molten metal, riser bush (4) wear to establish ejector pin (7) that are used for the foundry goods ejecting in first die cavity (1).

2. The insulated feeder sleeve device for the metal casting mold according to claim 1, wherein the wall thickness of the annular wall (42) is 1.5 to 3.5 mm.

3. The insulating riser bush device for metal casting molds according to claim 1, characterized in that the first cavity (1) has a trapezoidal cross-section, and a closed insulating layer (3) is provided between the riser bush (4) and the casting mold (2).

4. The insulated feeder sleeve device for metal casting molds according to claim 3, characterized in that said closed insulating layer (3) is provided outside said annular wall (42).

5. The insulated feeder sleeve device for metal casting molds according to claim 3, characterized in that a plurality of vent plugs (5) are provided in the base (1) axially in parallel with the carrier rod (7).

6. The insulating riser bush device for the metal casting mold as set forth in claim 5, wherein the vent plug (5) has a diameter of 8 to 14mm, and the vent gap width of the vent plug (5) is 0.15 to 0.2 mm.

7. The insulating feeder sleeve device for metal casting molds according to claim 1, characterized in that said base (41) is connected to the casting mold (2) by means of a plurality of fixing bolts (6).

8. The insulated feeder sleeve device for metal casting molds according to claim 2, wherein said annular wall (42) has a wall thickness of 2 mm.

9. The insulating feeder sleeve device for metal casting molds according to claim 5, characterized in that the vent gap width of said vent plug (5) is 0.15 mm.

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