CN111250680A - Cutting method of sand sticking riser of steel casting - Google Patents
Cutting method of sand sticking riser of steel casting Download PDFInfo
- Publication number
- CN111250680A CN111250680A CN202010212499.8A CN202010212499A CN111250680A CN 111250680 A CN111250680 A CN 111250680A CN 202010212499 A CN202010212499 A CN 202010212499A CN 111250680 A CN111250680 A CN 111250680A
- Authority
- CN
- China
- Prior art keywords
- cutting
- riser
- combustion
- sand
- sticking
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D31/00—Cutting-off surplus material, e.g. gates; Cleaning and working on castings
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Molds, Cores, And Manufacturing Methods Thereof (AREA)
Abstract
The invention belongs to the field of casting production, and provides a cutting method of a sand-sticking riser of a steel casting, which mainly utilizes the introduction of a combustion-supporting material in cutting flame to play a role in supporting combustion and fluxing, simultaneously releases a large amount of heat, improves the temperature of a position to be cut, reduces the melting point of substances at the sand-sticking position of the riser to be cut, generates slag with better fluidity, and simultaneously blows off the slag by utilizing flame high-speed airflow to form a cutting seam; and cutting continuously in such a way, and cutting off the dead head with serious sand sticking. The cutting method has the advantages of obvious effect, simple method, strong operability, and obvious cost saving because the used combustion-supporting materials are relatively cheap pure iron or low-carbon steel materials and the like.
Description
Technical Field
The invention belongs to the field of casting production, and provides a quick and low-cost cutting method for a steel casting with a riser seriously stuck with sand.
Background
In the manufacturing and production process of the steel castings, particularly the casting production of large steel castings and the removal of a pouring system, the most economical and efficient method is to adopt a flame cutting method, and flame cutting gases are most commonly acetylene, propane, liquefied gas, natural gas and the like. Natural gas is currently the most suitable gas for cutting, considering all together the aspects of pollution, energy consumption, cost and safety. The natural gas-oxygen flame temperature is typically around 2000 c, up to 2710 c, while the melting point of steel is about 1515 c, and there is no problem with conventional natural gas-oxygen cutting risers without sand sticking. However, because of the reasons of production quality control, the riser of the casting is often seriously bonded, because the melting point of the bonded sand is about 1800-2180 ℃ generally and is basically close to the flame temperature of the natural gas cutting torch, and in the actual production, because of the power and design problems of the cutting torch or the parameters such as gas purity and pressure, the flame temperature is probably not theoretically high. With the most common natural gas-oxygen flame cutting with low cost, the flame is difficult to melt the sticky sand layers, so that the cutting of the feeder head cannot be implemented.
The sticky sand is usually knocked by a mechanical mode firstly and is hammered by a wind shovel, so that the sticky sand is difficult to remove, even if a carbon arc air gouging is adopted firstly, a sticky sand layer cannot be planed, and the carbon arc rod cannot be ignited on the non-conductive sticky sand layer. The other method is that the oxygen melting rod can be used for melting off the sand layer, but the cutting and removing efficiency of the oxygen melting rod is low, the oxygen melting rod is high in price and large in consumption, and the cost of consumable materials is ten thousand yuan for removing a plurality of riser neck sand with the diameter of about 500 mm.
Disclosure of Invention
The invention provides a riser cutting method convenient to operate for a cast steel riser with serious sand sticking, and effectively solves the problem that the sand sticking riser in the prior art is difficult to cut.
A method for cutting a sand sticking riser of a steel casting comprises the following steps:
preparing for cutting: preparing a combustion-supporting material;
cutting a riser: and (3) placing the combustion-supporting material at the position to be cut of the riser, heating the combustion-supporting material by adopting a cutting torch, increasing the oxygen amount of the cutting torch to the maximum value when the melting point of the combustion-supporting material is reached, and continuously heating the position to be cut of the riser until the riser is cut and removed.
Further, the combustion-supporting material is pure iron or a low-carbon steel metal material with the carbon content (mass percent) less than or equal to 0.25%, preferably Q195 steel, Q215 steel, Q235 steel, Q255 steel, Q275 steel, 20# steel and 25# steel, or a pouring channel and an air outlet rod with the carbon content less than or equal to 0.25% and prepared for returning after being cut by a casting of a foundry.
Further, the combustion-supporting material is bar stock orBlock wherein the diameter of the bar is in the range of
The width of the block is greater than or equal to 100mm 50mm, and the length is selected primarily for ease of handling and for providing sufficient combustion supporting solution.
Furthermore, the cutting torch adopts natural gas and oxygen as fuels, and the corresponding cutting torch is selected according to the diameter or the thickness of the riser; when the gas amount of the cutting torch is the maximum, the length of the flame is more than or equal to 1.3 times of the thickness of the riser so as to ensure that the riser can be cut through.
Furthermore, the natural gas outlet pressure of the cutting torch is 1.5 bar-2.5 bar, and the natural gas flow is 11m3/h～19m3The pressure of an oxygen outlet is 8 bar-15 bar, the flow of oxygen is 100m3/h～170m3/h。
Further, before the step of cutting the feeder head, the casting and the feeder head are cleaned of dust, scum, floating sand and oxide scale, so that the foreign matters are prevented from splashing to hurt people or block the gun head during cutting.
The method of the invention has the following beneficial effects:
the riser cutting method mainly utilizes the combustion-supporting material introduced into the cutting flame to play a role in supporting combustion and fluxing, releases a large amount of heat at the same time, improves the temperature of a position to be cut, reduces the melting point of substances at the sand-sticking position of the riser to be cut, generates molten slag with better fluidity, and simultaneously blows off the molten slag by utilizing high-speed flame airflow to form a cutting seam; and cutting continuously in such a way, and cutting off the dead head with serious sand sticking. By adopting the method, riser cutting operators can realize the cutting of the casting system of the castings with serious sand burning on site under the condition that equipment tools are not changed; the method is also suitable for cutting severe risers or patches adhered with insulating bricks; through actual and large-scale application on site, the method has the advantages of obvious effect, simple method and strong operability, and the used combustion-supporting materials are also relatively cheap pure iron or low-carbon steel materials and the like, so the cost is saved remarkably.
Drawings
Is free of
Detailed Description
The technical solution of the present invention is further described in detail with reference to the following examples. In the present invention, unless otherwise specifically defined and limited, terms are to be construed broadly, and specific meanings of the terms in the present invention may be understood by those skilled in the art according to specific situations.
A method for cutting a sand sticking riser of a steel casting comprises the following steps:
step one, reasonably placing a casting: the casting is placed in a mode which is more powerful than cutting operation, so that the cutting molten steel slag flows naturally, the molten steel slag is less polluted by the casting as much as possible, and simultaneously, the adding of combustion-supporting materials is facilitated. For example, the cylinder body casting is provided with risers at the joint surface and the inner cavity of the cylinder body, if the risers at the inner cavity are not bonded with sand, the cylinder body casting is vertically placed, namely the risers of the inner cavity are contacted with the ground, and the cutting torch is adopted to directly and flatly cut the connecting part of the risers of the inner cavity and the cylinder body casting. If the riser at the inner cavity is seriously bonded with sand, the cylinder body casting and the riser are laterally placed, namely the riser is not contacted with the ground, even if an operator holds a cutting gun for cutting operation, the operator can observe the cutting condition of a cutting seam at any time, meanwhile, the cutting device is favorable for flowing molten metal to a cutting field, and the molten metal flows to the casting as little as possible to cause difficulty in subsequent cleaning, and most importantly, the cutting device can be convenient for combustion-supporting objects to be placed at the cutting position without falling.
Step two, cutting preparation: preparing a combustion-supporting material and a cutting device; the combustion-supporting material is pure iron or a low-carbon steel metal material with the carbon content (mass percent) less than or equal to 0.25 percent, preferably Q195 steel, Q215 steel, Q235 steel, Q255 steel, Q275 steel, 20# steel and 25# steel, or a pouring channel and an air outlet rod with the carbon content less than or equal to 0.25 percent and prepared for returning after casting in a foundry is cut. The cutting device adopts a cutting torch, the cutting torch adopts natural gas and oxygen as fuels, and the corresponding cutting torch is selected according to the diameter or the thickness of the riser; when the gas amount of the cutting torch is the maximum, the length of the flame is more than or equal to 1.3 times of the thickness of the riser so as to ensure that the riser can be cut through.
Specifically, the combustion-supporting material is a bar or block, wherein the diameter range of the bar is
The width of the block is greater than or equal to 100mm 50mm, and the length is selected primarily for ease of handling and for providing sufficient combustion supporting solution. The natural gas outlet pressure of the cutting torch is 1.5 bar-2.5 bar, the natural gas flow is 11m3/h～19m3The pressure of an oxygen outlet is 8 bar-15 bar, the flow of oxygen is 100m3/h～170m3/h。
Step three, cutting a riser: before cutting the feeder head, cleaning dust, scum, floating sand and oxide skin on the casting and the feeder head, and preventing the foreign matters from splashing to hurt people or blocking the gun head during cutting.
The method comprises the steps of preparing various preparations, checking that an equipment tool is in a normal state, starting cutting, placing combustion-supporting materials at the position of the riser to be cut, heating the combustion-supporting materials by adopting a cutting torch, preheating the position of the riser to be cut at the same time, increasing the oxygen amount of the cutting torch to a maximum value when the melting point of the combustion-supporting materials is reached, and continuously heating the position of the riser to be cut until the riser is cut and removed. Specifically, the oxygen amount of the cutting torch is increased to the maximum value, at the moment, the temperature of the molten liquid reaches a higher level, the molten steel is mixed on the surface of the bonded sand, and when the flame of the cutting torch is continuously heated, the bonded sand layer mixed with the combustion-supporting molten steel starts to be melted and is blown away by the flame high-speed airflow, so that the bonded sand layer on the riser is cut off. In the cutting process, combustion-supporting materials are added into the cutting seam in time according to the consumption condition of the combustion-supporting materials, heating and cutting are continuously carried out until the sand burning of the original riser and the riser molten steel below the sand burning layer of the original riser are melted and blown away, and therefore the purpose of cutting and removing the sand burning riser is achieved. In addition, if the sand-bonded layer is melted and cut off, the metal without sand-bonded in the riser is leaked, and the normal cutting can be carried out without adding combustion-supporting materials. But the addition of combustion-supporting materials can improve the cutting efficiency, especially for high alloy steel castings and risers thereof.
Although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments or portions thereof without departing from the spirit and scope of the invention.
Claims (7)
1. A method for cutting a sand sticking riser of a steel casting is characterized by comprising the following steps:
preparing for cutting: preparing a combustion-supporting material;
cutting a riser: and (3) placing the combustion-supporting material at the position to be cut of the riser, heating the combustion-supporting material by adopting a cutting torch, increasing the oxygen amount of the cutting torch to the maximum value when the melting point of the combustion-supporting material is reached, and continuously heating the position to be cut of the riser until the riser is cut and removed.
2. The method for cutting the sand sticking riser of the steel casting according to claim 1, wherein the combustion-supporting material is pure iron or a low-carbon steel metal material with the carbon content less than or equal to 0.25%.
3. The method for cutting the sand-sticking riser of the steel casting according to claim 2, wherein the combustion-supporting material is bar stock or block material.
4. The method for cutting the sand-sticking riser of the steel casting as claimed in claim 3, wherein the diameter range of the combustion-supporting material is bar stock
5. The method of claim 1, wherein the cutting torch uses natural gas and oxygen as fuel.
6. The method for cutting the sand sticking riser of the steel casting according to claim 5, wherein the natural gas outlet pressure of the cutting torch is 1.5 bar-2.5 bar, and the natural gas flow is 11m3/h～19m3The pressure of an oxygen outlet is 8 bar-15 bar, the flow of oxygen is 100m3/h～170m3/h。
7. The method of claim 1, wherein the step of cutting the risers is preceded by cleaning the casting and the risers from dust, dross, floating sand, and scale.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010212499.8A CN111250680A (en) | 2020-03-27 | 2020-03-27 | Cutting method of sand sticking riser of steel casting |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010212499.8A CN111250680A (en) | 2020-03-27 | 2020-03-27 | Cutting method of sand sticking riser of steel casting |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111250680A true CN111250680A (en) | 2020-06-09 |
Family
ID=70954906
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010212499.8A Pending CN111250680A (en) | 2020-03-27 | 2020-03-27 | Cutting method of sand sticking riser of steel casting |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111250680A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114603121A (en) * | 2022-02-08 | 2022-06-10 | 共享铸钢有限公司 | Cleaning device and cleaning method for burnt sand in inner cavity of casting |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AU3387384A (en) * | 1983-10-07 | 1985-04-18 | Aikoh Co. Ltd. | A method for gas cutting a hot top and a core for carrying out the method |
| FR2695051B1 (en) * | 1992-08-25 | 1994-12-30 | Michel Donze | Method and device for simultaneously removing two defective edges from a parallelepiped slab. |
| CN101190473A (en) * | 2006-11-21 | 2008-06-04 | 胡保银 | Non ethyne metal cutting method |
| CN104475915A (en) * | 2014-11-13 | 2015-04-01 | 宁夏共享铸钢有限公司 | High-alloy steel casting test block cutting method |
| CN106825843A (en) * | 2017-02-28 | 2017-06-13 | 共享铸钢有限公司 | A kind of diced system of large-scale high-alloy steel casting pressing port |
| CN108941521A (en) * | 2018-07-27 | 2018-12-07 | 共享铸钢有限公司 | A kind of riser cutting method of large size two phase stainless steel steel-casting |
-
2020
- 2020-03-27 CN CN202010212499.8A patent/CN111250680A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AU3387384A (en) * | 1983-10-07 | 1985-04-18 | Aikoh Co. Ltd. | A method for gas cutting a hot top and a core for carrying out the method |
| FR2695051B1 (en) * | 1992-08-25 | 1994-12-30 | Michel Donze | Method and device for simultaneously removing two defective edges from a parallelepiped slab. |
| CN101190473A (en) * | 2006-11-21 | 2008-06-04 | 胡保银 | Non ethyne metal cutting method |
| CN104475915A (en) * | 2014-11-13 | 2015-04-01 | 宁夏共享铸钢有限公司 | High-alloy steel casting test block cutting method |
| CN106825843A (en) * | 2017-02-28 | 2017-06-13 | 共享铸钢有限公司 | A kind of diced system of large-scale high-alloy steel casting pressing port |
| CN108941521A (en) * | 2018-07-27 | 2018-12-07 | 共享铸钢有限公司 | A kind of riser cutting method of large size two phase stainless steel steel-casting |
Non-Patent Citations (3)
| Title |
|---|
| （美）沃尔顿（WALTON，C.F.）: "《铸铁件手册》", 31 December 1990, 北京：清华大学出版社 * |
| 钟瓒: "天然气火焰切割大厚度不锈钢", 《机械》 * |
| 陈琦: "《铸造技术问题对策》", 30 March 2001, 北京：机械工业出版社 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114603121A (en) * | 2022-02-08 | 2022-06-10 | 共享铸钢有限公司 | Cleaning device and cleaning method for burnt sand in inner cavity of casting |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104668880A (en) | Bearing steel welding repairing method | |
| CN111518986B (en) | Steelmaking method of scrap steel smelting system by utilizing primary combustion heat energy | |
| CN103290431B (en) | The charged restorative procedure of aluminum electrolytic cell riser bus bar | |
| CN111250680A (en) | Cutting method of sand sticking riser of steel casting | |
| CN108015245B (en) | A kind of hot base corner crack Hand scarf device and method | |
| CN211162323U (en) | Flame cutting mechanism of continuous casting machine | |
| CN102423824A (en) | Disassembly method of damaged bridge pipe of coke oven | |
| CN212476800U (en) | Device for promoting rapid temperature rise of blast furnace hearth | |
| US4366950A (en) | Method and apparatus for cutting stainless steel | |
| CN200954567Y (en) | Oxygen-blowing bar | |
| US2260322A (en) | Deseaming and desurfacing apparatus and process | |
| JP5061630B2 (en) | Gas cutting method for slabs being cast by vertical continuous casting machine | |
| CN203429199U (en) | Composite brick core of bottom blowing air brick for ladle refining | |
| EP0710169B1 (en) | A process for cutting large blocks of metal | |
| CN212599563U (en) | Carbon arc air gouging machine with water spray cooling mechanism | |
| CN111349733B (en) | Method for repairing blast furnace ball-milling cast iron cooling wall | |
| CN220093035U (en) | Ladle nozzle cleaning device for smelting stainless steel | |
| SU825279A1 (en) | Method of separating gate system elements from castings | |
| CN112981023A (en) | Molten iron ladle slag cover treatment device | |
| TWM655972U (en) | Flame cutting aids to improve the efficiency of handheld gas flame cutting tools | |
| CN212776815U (en) | Gas cylinder guardrail device with novel structure | |
| JP2536793Y2 (en) | Peripheral structure of gas nozzle for electric furnace gas injection | |
| JP2013103242A (en) | Cutting device and cutting method for high nickel alloy | |
| CN208033914U (en) | A kind of electroslag welding striking with water cooling and spark blowout | |
| CN206981965U (en) | A kind of argon arc welding automatic welder |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20200609 |