CN112296279A - Novel split type round steel die casting process - Google Patents
Novel split type round steel die casting process Download PDFInfo
- Publication number
- CN112296279A CN112296279A CN202011145842.8A CN202011145842A CN112296279A CN 112296279 A CN112296279 A CN 112296279A CN 202011145842 A CN202011145842 A CN 202011145842A CN 112296279 A CN112296279 A CN 112296279A
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- Prior art keywords
- sand
- mold
- core
- pouring
- box
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D7/00—Casting ingots, e.g. from ferrous metals
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/02—Sand moulds or like moulds for shaped castings
Abstract
The invention provides a novel split type round steel die casting process, which is carried out by the steps of molding, box matching, smelting, pouring, heat preservation, box opening, finishing and inspection, wherein a step type pouring system is combined with an annular pouring system, and a novel parting surface positioning process of embedded positioning of a casting mould body is adopted; the washing to the bottom of the casting mould is reduced, and the exhaust is facilitated; the temperature distribution is uniform, a solidification sequence from bottom to top can be formed, and a compact tissue can be obtained; the casting mold and the casting core are convenient and accurate to mold, and the labor efficiency is improved.
Description
Technical Field
The invention relates to the technical field of metal metallurgy, in particular to a novel split type round steel die casting process.
Background
At present, the round steel mould with the height of 4110mm and the biggest difference from other round steel ingot moulds is that the middle of the width dimension of an external mould is big phi 680mm, the two ends of the external mould are small phi 650mm, the dimension is ensured, the external mould must be subjected to central parting, and the external mould is subjected to mould assembling during the box assembling, the traditional process is that the centre of the mould is divided, the upper and lower positioning pins of the mould are positioned, the parting line of the parting line during the moulding is delayed, the external part of the sand box is scribed and positioned (for mould assembling), and the process has 2 defects: firstly, the die is difficult to lift, the total height of the die is 4110mm, the height of the rear half die of the middle split die is more than 2m, although the single-side draft angle is 15mm, the strength of the resin sand after hardening is high, and the die is likely to be damaged by drawing in the traditional die lifting mode; secondly, the height of the upper casting mold and the lower casting mold is high, the casting molds are heavy, the positioning according to the marking is difficult during the box assembling, and the dislocation is easy to generate, so the technical requirement on operators is high.
Disclosure of Invention
In view of the defects of the prior art, the technical problem to be solved by the invention is to provide a novel split type round steel die casting process, which is convenient to cast, reduces the technical requirements on operators, improves the error rate, has uniform temperature distribution, can form a solidification sequence from bottom to top, and is beneficial to obtaining a compact structure.
In order to solve the technical problem, the invention provides a novel split type round steel die casting process, which comprises the following steps:
1) moulding
S1, respectively fastening an upper mold and a lower mold of the outer mold on a special supporting plate, then sleeving a special sand box, filling furan resin self-hardening sand between the molds and the sand box, tamping along the molds in the filling process, and lifting the sand box to perform demolding by utilizing the dead weight of the molds and the bottom plate or knocking the bottom plate after the molding sand is hardened;
s2, positioning the sand core and the core head into a whole, firstly placing the core mould in the center of the supporting plate, then placing the exhaust core bone in the center, finally filling furan resin self-hardening sand, tamping along the core mould wall in the filling process, and detaching the core mould to demould after the molding sand is hardened;
s3, adopting a circular ceramic tube as a straight pouring channel of the pouring system, and fixing a horizontal pouring channel and an inner pouring channel at the bottom as a solid mold on a positioning core head;
2) distribution box
S1, firstly, sleeving a sand core into the lower outer mold, positioning by adopting a sand core head, and measuring whether the wall thickness of the periphery of the upper outer mold and the sand core is uniform or not and whether the core head is higher than the plane of the outer mold or not after the sand core head is sleeved;
s2, sleeving the sand core into an upper outer mold, positioning and fixing, and measuring whether the wall thickness of the periphery of the upper outer mold and the sand core is uniform or not and whether the core head is higher than the plane of the outer mold or not;
s3, covering the cover box;
s4, placing a pouring cup, and fixing the pouring cup with sand around;
3) smelting and pouring
S1, weighing according to a batching list, sequentially adding raw materials such as scrap iron, carburant, pig iron, scrap steel and the like, and carrying out stokehole analysis after iron is liquefied and cleaned;
s2, heating the molten iron to 1380-1420 ℃ after the components of the molten iron meet the requirements, and discharging;
s3, measuring the temperature before pouring, and ensuring that the pouring temperature is between 1260 and 1300 ℃;
s4, casting according to the principle of fast first and slow second when casting;
4) heat preservation
Preserving the heat for 48 hours;
5) unpacking and finishing
S1, removing the upper cover box, removing the outer mold sand box, flattening the steel ingot mold, and then air-cooling to normal temperature;
s2, knocking to remove the stepped pouring system and the riser, and cleaning the molding sand on the inner surface and the outer surface of the steel ingot mold until all the molding sand is cleaned;
6) examination of
The chemical composition, the size and the quality of the inner and outer surfaces of the ingot mould are tested according to the ingot mould industry standard (YB/T070-.
Specifically, in the step 1), the mold is repaired after demolding S1, 1 layer of zircon powder alcohol-based paint is coated after the mold is repaired, and 1 layer of graphite paint is coated after the zircon powder alcohol-based paint is combusted.
Specifically, in the step 1), the core mold is disassembled and demolded in S2, 1 layer of zircon powder alcohol-based paint is coated after the core is repaired, and 1 layer of graphite alcohol-based paint is coated after the core is combusted.
The outer mold in the step 1) adopts a wood structure or a steel-wood structure.
As mentioned above, the novel split type round steel die casting process has the following beneficial effects:
1. the casting is convenient, the technical requirements on operators are reduced, and the error-proofing rate is improved;
2. the washing to the bottom of the casting mould is reduced, and the exhaust is facilitated;
3. the temperature distribution is uniform, a solidification sequence from bottom to top can be formed, and a compact tissue can be obtained;
4. the casting mold and the casting core are convenient and accurate to mold, and the labor efficiency is improved.
Drawings
FIG. 1 is a schematic view of a sand core employing centralized venting of the center in accordance with an embodiment of the present invention;
FIG. 2 is a schematic view of a stepped gating system in combination with an annular gating system in accordance with an embodiment of the present invention;
FIG. 3 is a schematic view of the positioning of the novel parting plane of the embedded positioning of the casting mold body according to the embodiment of the present invention;
FIG. 4 is a schematic view of the parting upper positioning of the embedded positioning of the mold body according to the embodiment of the present invention.
Description of reference numerals: the casting sand core positioning device comprises a pouring cup 1, a riser 2, a cover box 3, a sprue 4, a casting sand box 5, a cavity 6, a middle ingate 7, a middle cross gate 8, a sand core 9, a core bar 9, a lower ingate 11, a lower cross gate 12, a positioning sand core 13, a bottom plate 14, a parting positioning 15, an upper ingate 16, a parting lower positioning 17 and a parting upper positioning 18.
Detailed Description
The following description of the embodiments of the present invention is provided for illustrative purposes, and other advantages and effects of the present invention will become apparent to those skilled in the art from the present disclosure.
Please refer to fig. 1 to 4. It should be understood that the structures, ratios, sizes, and the like shown in the drawings and described in the specification are only used for matching with the disclosure of the specification, so as to be understood and read by those skilled in the art, and are not used to limit the conditions under which the present invention can be implemented, so that the present invention has no technical significance, and any structural modification, ratio relationship change, or size adjustment should still fall within the scope of the present invention without affecting the efficacy and the achievable purpose of the present invention. In addition, the terms "upper", "lower", "left", "right", "middle" and "one" used in the present specification are for clarity of description, and are not intended to limit the scope of the present invention, and the relative relationship between the terms and the terms is not to be construed as a scope of the present invention.
In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; either directly or through an intermediate medium, or both elements may be interconnected. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
As shown in fig. 1, 2, 3 and 4, the invention provides a novel split type round steel die casting process, which comprises the following steps:
1) moulding
S1, respectively fastening an upper mold and a lower mold of the outer mold on a special supporting plate, then sleeving a special sand box, filling furan resin self-hardening sand between the molds and the sand box, tamping along the molds in the filling process, and lifting the sand box to perform demolding by utilizing the dead weight of the molds and the bottom plate or knocking the bottom plate after the molding sand is hardened;
s2, positioning the sand core and the core head into a whole, firstly placing the core mould in the center of the supporting plate, then placing the exhaust core bone in the center, finally filling furan resin self-hardening sand, tamping along the core mould wall in the filling process, and detaching the core mould to demould after the molding sand is hardened;
s3, adopting a circular ceramic tube as a straight pouring channel of the pouring system, and fixing a horizontal pouring channel and an inner pouring channel at the bottom as a solid mold on a positioning core head;
2) distribution box
S1, firstly, sleeving a sand core into the lower outer mold, positioning by adopting a sand core head, and measuring whether the wall thickness of the periphery of the upper outer mold and the sand core is uniform or not and whether the core head is higher than the plane of the outer mold or not after the sand core head is sleeved;
s2, sleeving the sand core into an upper outer mold, positioning and fixing, and measuring whether the wall thickness of the periphery of the upper outer mold and the sand core is uniform or not and whether the core head is higher than the plane of the outer mold or not;
s3, covering the cover box;
s4, placing a pouring cup, and fixing the pouring cup with sand around;
3) smelting and pouring
S1, weighing according to a batching list, sequentially adding raw materials such as scrap iron, carburant, pig iron, scrap steel and the like, and carrying out stokehole analysis after iron is liquefied and cleaned;
s2, heating the molten iron to 1380-1420 ℃ after the components of the molten iron meet the requirements, and discharging;
s3, measuring the temperature before pouring, and ensuring that the pouring temperature is between 1260 and 1300 ℃;
s4, casting according to the principle of fast first and slow second when casting;
4) heat preservation
Preserving the heat for 48 hours;
5) unpacking and finishing
S1, removing the upper cover box, removing the outer mold sand box, flattening the steel ingot mold, and then air-cooling to normal temperature;
s2, knocking to remove the stepped pouring system and the riser, and cleaning the molding sand on the inner surface and the outer surface of the steel ingot mold until all the molding sand is cleaned;
6) examination of
The chemical composition, the size and the quality of the inner and outer surfaces of the ingot mould are tested according to the ingot mould industry standard (YB/T070-.
Specifically, in the step 1), the mold is repaired after demolding S1, 1 layer of zircon powder alcohol-based paint is coated after the mold is repaired, and 1 layer of graphite paint is coated after the zircon powder alcohol-based paint is combusted.
Specifically, in the step 1), the core mold is disassembled and demolded in S2, 1 layer of zircon powder alcohol-based paint is coated after the core is repaired, and 1 layer of graphite alcohol-based paint is coated after the core is combusted.
The outer mold in the step 1) adopts a wood structure or a steel-wood structure.
As shown in figure 1, the mould adopts a wood structure or a steel-wood structure, the molding sand adopts furan resin self-hardening sand, the pouring system adopts a stepped pouring system, the upper casting mould and the lower casting mould adopt body embedded positioning, 2 risers are designed according to the weight and the wall thickness of the ingot mould, the sand core adopts center concentrated exhaust, the scouring on the bottom of the casting mould is reduced, the exhaust is facilitated, the casting is convenient, the technical requirements on operators are reduced, and the mistake proofing rate is improved.
As shown in FIG. 2, the pouring process combining the stepped pouring system and the annular pouring system ensures that the temperature distribution is uniform in the mold filling process while ensuring the stable pouring, can form a solidification sequence from bottom to top, is favorable for obtaining a compact structure, has uniform temperature distribution, can form a solidification sequence from bottom to top, and is favorable for obtaining the compact structure.
As shown in fig. 3 and 4, the novel parting surface positioning process with the lower-section positioning, the upper-section positioning and the embedded positioning of the casting mold body is convenient for mold assembling, avoids the problem of wrong mold, is convenient and accurate for mold assembling of the casting mold and the casting core, and improves the labor efficiency.
The novel split round steel die casting process can be applied to the production of other round steel dies of the same type.
In conclusion, the novel split type round steel die casting process is convenient to cast, reduces the technical requirements on operators, and improves the error proofing rate; the washing to the bottom of the casting mould is reduced, and the exhaust is facilitated; the temperature distribution is uniform, a solidification sequence from bottom to top can be formed, and a compact tissue can be obtained; the casting mold and the casting core are convenient and accurate to mold, and the labor efficiency is improved.
Claims (4)
1. A novel split type round steel die casting process is characterized by comprising the following steps:
1) moulding
S1, respectively fastening an upper mold and a lower mold of the outer mold on a special supporting plate, then sleeving a special sand box, filling furan resin self-hardening sand between the molds and the sand box, tamping along the molds in the filling process, and lifting the sand box to perform demolding by utilizing the dead weight of the molds and the bottom plate or knocking the bottom plate after the molding sand is hardened;
s2, positioning the sand core and the core head into a whole, firstly placing the core mould in the center of the supporting plate, then placing the exhaust core bone in the center, finally filling furan resin self-hardening sand, tamping along the core mould wall in the filling process, and detaching the core mould to demould after the molding sand is hardened;
s3, adopting a circular ceramic tube as a straight pouring channel of the pouring system, and fixing a horizontal pouring channel and an inner pouring channel at the bottom as a solid mold on a positioning core head;
2) distribution box
S1, firstly, sleeving a sand core into the lower outer mold, positioning by adopting a sand core head, and measuring whether the wall thickness of the periphery of the upper outer mold and the sand core is uniform or not and whether the core head is higher than the plane of the outer mold or not after the sand core head is sleeved;
s2, sleeving the sand core into an upper outer mold, positioning and fixing, and measuring whether the wall thickness of the periphery of the upper outer mold and the sand core is uniform or not and whether the core head is higher than the plane of the outer mold or not;
s3, covering the cover box;
s4, placing a pouring cup, and fixing the pouring cup with sand around;
3) smelting and pouring
S1, weighing according to a batching list, sequentially adding raw materials such as scrap iron, carburant, pig iron, scrap steel and the like, and carrying out stokehole analysis after iron is liquefied and cleaned;
s2, heating the molten iron to 1380-1420 ℃ after the components of the molten iron meet the requirements, and discharging;
s3, measuring the temperature before pouring, and ensuring that the pouring temperature is between 1260 and 1300 ℃;
s4, casting according to the principle of fast first and slow second when casting;
4) heat preservation
Preserving the heat for 48 hours;
5) unpacking and finishing
S1, removing the upper cover box, removing the outer mold sand box, flattening the steel ingot mold, and then air-cooling to normal temperature;
s2, knocking to remove the stepped pouring system and the riser, and cleaning the molding sand on the inner surface and the outer surface of the steel ingot mold until all the molding sand is cleaned;
6) examination of
And (5) inspecting the chemical components, the sizes and the quality of the inner surface and the outer surface of the ingot mold.
2. The novel split type round steel die casting process of claim 1, which is characterized in that: and (3) in the step 1), the mold is repaired after demolding S1, 1 layer of zircon powder alcohol-based coating is coated after the mold is repaired, and 1 layer of graphite coating is coated after the zircon powder alcohol-based coating is combusted.
3. The novel split type round steel die casting process of claim 1, which is characterized in that: and step 1), detaching the core mold and demolding S2, brushing 1 layer of zircon powder alcohol-based coating after core repair, and brushing 1 layer of graphite alcohol-based coating after combustion.
4. The novel split type round steel die casting process of claim 1, which is characterized in that: in the step 1), the outer mould adopts a wood structure or a steel-wood structure.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011145842.8A CN112296279A (en) | 2020-10-23 | 2020-10-23 | Novel split type round steel die casting process |
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| CN202011145842.8A CN112296279A (en) | 2020-10-23 | 2020-10-23 | Novel split type round steel die casting process |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113814363A (en) * | 2021-09-16 | 2021-12-21 | 黄石新兴管业有限公司 | Bottom shower type in-core pouring system for large steel ingot mold casting |
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2020
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113814363A (en) * | 2021-09-16 | 2021-12-21 | 黄石新兴管业有限公司 | Bottom shower type in-core pouring system for large steel ingot mold casting |
| CN113814363B (en) * | 2021-09-16 | 2022-12-27 | 黄石新兴管业有限公司 | Bottom shower type in-core pouring system for large steel ingot mold casting |
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Application publication date: 20210202 |
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