CN113634713A - Molding method for preventing sand sticking - Google Patents
Molding method for preventing sand sticking Download PDFInfo
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- CN113634713A CN113634713A CN202110944138.7A CN202110944138A CN113634713A CN 113634713 A CN113634713 A CN 113634713A CN 202110944138 A CN202110944138 A CN 202110944138A CN 113634713 A CN113634713 A CN 113634713A
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- processing
- groove
- stepped groove
- tool withdrawal
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C7/00—Patterns; Manufacture thereof so far as not provided for in other classes
- B22C7/02—Lost patterns
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- 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
- B22C9/04—Use of lost patterns
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/12—Treating moulds or cores, e.g. drying, hardening
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Processing Of Stones Or Stones Resemblance Materials (AREA)
- Mold Materials And Core Materials (AREA)
Abstract
The invention discloses a molding method for preventing sand sticking, which relates to the technical field of lost foam, and comprises the following steps: firstly, receiving data and importing the data into programming software; according to the requirements of customers, according to different color swelling amounts and the size of a machine tool, a programmer carries out layered processing on the model structure and puts the model into a corresponding model scaling; and (4) putting the programmed program into a processing machine, fixing the processing machine by placing a foam block with a proper size, and starting processing. In the invention, the minimum distance of the tool withdrawal groove with the expansion amount is ensured to be 20mm through treatment, the arc transition treatment of the tool withdrawal groove of the machine head is carried out, the machining allowance of the tool withdrawal groove of the sliding block is reduced and treated to the parallel position of the sight line, the C surface is attached to the structure with the reverse hand, and the machining allowance of 20mm up and down is ensured, so that the design benefit is that: the sand intensity of narrow and small position is guaranteed, the problem of sand sticking is solved from the source, the modeling difficulty is reduced, the sand cleaning time is reduced, and the appearance of the casting is improved.
Description
Technical Field
The invention relates to the technical field of lost foam, in particular to a molding method for preventing sand sticking.
Background
The lost foam casting is a full mold casting of a foam plastic mold by adopting binder-free dry sand combined with a vacuumizing technology, and the bonded sand is divided into mechanical bonded sand and chemical bonded sand. The mechanical sand-sticking process is that when high-temperature molten iron is used for pouring, the casting sand in the mould is heated, and the part with a wide heat release area is gradually cooled and solidified. However, in the bag-shaped mold portion surrounded by molten iron on the upper, lower, left, and right sides, the sand temperature of the mold approaches the molten iron temperature, and the molten iron temperature at these portions hardly drops, and is maintained in a high-temperature, liquid state for a long period of time.
In this state, although a refractory coating layer is arranged between the casting mold and the molten iron, the coating layer is cracked and scratched due to the thermal friction of the molten iron, the molten iron begins to seep into the casting mold, the narrow structure is easy to bury sand and is not solid, the larger the gap is, the easier the molten iron seeps, and the more serious the sand sticking condition is; and the sand with a narrow structure has low strength, and the sand is easy to be dispersed by molten iron, so that the sand sticking degree is increased, and even more serious defects are caused.
Disclosure of Invention
The invention aims to solve the problems of the prior art, and provides a molding method for preventing sand sticking.
In order to achieve the purpose, the invention adopts the following technical scheme:
a molding method for preventing sand sticking comprises the following steps:
firstly, receiving data and importing the data into programming software;
secondly, according to the requirements of customers, according to different color swelling amounts and the size of a machine tool, a programmer carries out layered processing on the model structure and puts the model into a corresponding model scaling;
thirdly, the programmed program is put into a processing machine, and the processing machine places foam blocks with proper sizes for fixation and starts processing;
fourthly, after the front side processing is finished, the model is turned and fixed, and the back side processing is carried out;
after the model is processed, assembling the layered models according to the programmed assembly course, and installing and repairing small blocks at positions which cannot be processed by the processing machine;
sixthly, data are compared, and the pasters are pasted to corresponding positions;
step seven, polishing the model smoothly, and forming a drain hole through a hole digger;
and eighth step, processing the tool withdrawal part of the machine head, the tool withdrawal part of the sliding block, the stepped groove, the inverse hand structure and the part where the processing surface is close to the rib in the model structure, and facilitating casting.
Further, the narrow part of the tool withdrawal groove of the machine head is cut off by a knife within the range of the amount of expansion to form an inclined plane A, the value range of the inclined plane A is more than or equal to 20mm, and when the inclined plane A is less than 20mm, the size of the tool withdrawal groove inlet and outlet B of the machine head is increased, so that the size of the tool withdrawal groove inlet and outlet B is larger than A.
Furthermore, the narrow part of the slide block type tool withdrawal groove part after the expansion amount is cut by a knife to form an inclined plane within the expansion amount range, the distance X between the two inclined planes is more than 20mm, the angle formed by the inclined plane and the tool withdrawal groove is more than or equal to 90 degrees, the depth of the counter hand is measured, the maximum depth is used as one side of the triangular prism to cut the corresponding C surface, the C surface is adhered to the counter hand by glue, and the situation that the hand does not extend into the structure by more than 90 degrees is ensured.
Further, the ladder groove carries out landfill treatment through the foam block, ladder groove width W is less than 50mm, dies the ladder groove stifled, ladder groove width W is less than ladder groove degree of depth H and is less than 100mm, is less than ladder groove width W to ladder groove degree of depth H with the ladder groove stifled, ladder groove width W is greater than 100mm, blocks up to ladder groove degree of depth H less than or equal to 1.5 ladder groove width W with the ladder groove.
And further, the processed surface and the ribs are close to each other and are buried by cutting the foam block with a small cutter to 10mm below the processed surface.
Compared with the prior art, the invention has the following beneficial effects:
in the invention, the minimum distance of the tool withdrawal groove with the expansion amount is ensured to be 20mm through treatment, the arc transition treatment of the tool withdrawal groove of the machine head is carried out, the machining allowance of the tool withdrawal groove of the sliding block is reduced and treated to the parallel position of the sight line, the C surface is attached to the structure with the reverse hand, and the machining allowance of 20mm up and down is ensured, so that the design benefit is that: the sand intensity of narrow and small position is guaranteed, the problem of sand sticking is solved from the source, the modeling difficulty is reduced, the sand cleaning time is reduced, and the appearance of the casting is improved.
Drawings
FIG. 1 is a schematic view showing a process of preventing sand sticking in a molding method according to the present invention, in which an inclined plane A in a tool withdrawal portion of a machine head is 20mm or more;
FIG. 2 is a schematic view of a process for preventing sand sticking in a molding method according to the present invention, wherein the slope A of the tool withdrawal portion of the machine head is less than 20 mm;
FIG. 3 is a schematic view of a slide block type tool withdrawal groove part before being processed in the molding method for preventing sand sticking provided by the invention;
FIG. 4 is a schematic view of a slide block type tool withdrawal groove part after being processed in a molding method for preventing sand sticking provided by the invention;
FIG. 5 is a schematic view of a molding method for preventing sand sticking, according to the present invention, before step groove processing;
FIG. 6 is a schematic view of the molding method for preventing sand sticking after the step groove treatment;
FIG. 7 is a schematic view of a molding method for preventing sand-sticking according to the present invention before the reverse-hand mechanism is processed;
FIG. 8 is a schematic view of the handling of the backhand mechanism in a sand-sticking prevention molding method according to the present invention;
FIG. 9 is a top view of a molding method for preventing sand sticking according to the present invention before processing of the processed surface near the ribs;
fig. 10 is a front view of a molding method for preventing sand sticking according to the present invention after processing a processed surface in a vicinity of a rib.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.
In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention.
Referring to fig. 1 to 10, a molding method for preventing sand sticking includes the steps of:
firstly, receiving data and importing the data into programming software;
secondly, according to the requirements of customers, according to different color swelling amounts and the size of a machine tool, a programmer carries out layered processing on the model structure and puts the model into a corresponding model scaling;
thirdly, the programmed program is put into a processing machine, and the processing machine places foam blocks with proper sizes for fixation and starts processing;
fourthly, after the front side processing is finished, the model is turned and fixed, and the back side processing is carried out;
after the model is processed, assembling the layered models according to the programmed assembly course, and installing and repairing small blocks at positions which cannot be processed by the processing machine;
sixthly, data are compared, and the pasters are pasted to corresponding positions;
step seven, polishing the model smoothly, and forming a drain hole through a hole digger;
and eighth step, processing the tool withdrawal part of the machine head, the tool withdrawal part of the sliding block, the stepped groove, the inverse hand structure and the part where the processing surface is close to the rib in the model structure, and facilitating casting.
Example one, refer to fig. 1-2; the narrow part of the machine head tool withdrawal groove after the expansion amount is cut off by a knife within the expansion amount range to form an inclined plane A, the value range of the inclined plane A is more than or equal to 20mm, and when the inclined plane A is less than 20mm, the size of an inlet and outlet B of the machine head tool withdrawal groove is increased, so that the size of the inlet and outlet B is larger than A;
the experimental data on the size of the nose tool withdrawal groove inlet and outlet B are as follows:
example two, refer to fig. 3-4 and fig. 7-8; the narrow part of the slide block type tool withdrawal groove after the expansion amount is cut by a knife to form an inclined plane within the expansion amount range, the distance X between the two inclined planes is more than 20mm, the inclined plane and the tool withdrawal groove form a reverse hand position with an angle of more than or equal to 90 degrees, the reverse hand depth is measured, the maximum depth is used as one side of a triangular prism to cut a corresponding C surface, the C surface is stuck to the reverse hand position by glue, the condition that the hand extends into the reverse hand position without a structure of more than 90 degrees is ensured, the C surface is a foam strip in the shape of the triangular prism, and the foam strip can be cut by a line processing foam cutting machine, a knife or a sawing machine according to the actual size when the foam strip is used;
the experimental data on the size of the slide block type relief groove X are as follows:
experimental data on the B size in the backhand mechanism are as follows:
example three, refer to fig. 5-6; the step groove is subjected to landfill treatment through foam blocks, the width W of the step groove is smaller than 50mm, the step groove is blocked, the width W of the step groove is smaller than the depth H of the step groove and smaller than 100mm, the depth H of the step groove to the step groove is smaller than the width W of the step groove, the width W of the step groove is larger than 100mm, and the depth H of the step groove to the step groove is smaller than or equal to 1.5 of the width W of the step groove;
experimental data on the H' dimension in the stepped channel are as follows:
example four, refer to fig. 9-10; the processed surface and the ribs are close to each other and are buried by cutting the foam blocks with a small cutter until the thickness of the foam blocks is 10mm below the processed surface;
experimental data on D size in machined surface to rib approach are as follows:
the above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (5)
1. A molding method for preventing sand sticking is characterized by comprising the following steps:
firstly, receiving data and importing the data into programming software;
secondly, according to the requirements of customers, according to different color swelling amounts and the size of a machine tool, a programmer carries out layered processing on the model structure and puts the model into a corresponding model scaling;
thirdly, the programmed program is put into a processing machine, and the processing machine places foam blocks with proper sizes for fixation and starts processing;
fourthly, after the front side processing is finished, the model is turned and fixed, and the back side processing is carried out;
after the model is processed, assembling the layered models according to the programmed assembly course, and installing and repairing small blocks at positions which cannot be processed by the processing machine;
sixthly, data are compared, and the pasters are pasted to corresponding positions;
step seven, polishing the model smoothly, and forming a drain hole through a hole digger;
and eighth step, processing the tool withdrawal part of the machine head, the tool withdrawal part of the sliding block, the stepped groove, the inverse hand structure and the part where the processing surface is close to the rib in the model structure, and facilitating casting.
2. The molding method for preventing sand sticking as claimed in claim 1, wherein the nose tool withdrawal groove part cuts off the narrow part after the expansion amount by a knife within the expansion amount range to form an inclined plane a, the value range of the inclined plane a is greater than or equal to 20mm, and when the inclined plane a is less than 20mm, the size of the nose tool withdrawal groove inlet and outlet B is increased to make B greater than a.
3. The molding method for preventing sand sticking as claimed in claim 1, wherein the slide block type tool withdrawal groove part cuts off a narrow part after the expansion amount by a knife within the expansion amount range to form an inclined surface, the distance X between the two inclined surfaces is more than 20mm, the angle formed by the inclined surface and the tool withdrawal groove is more than or equal to 90 degrees at the back hand position, the back hand depth is measured, the corresponding C surface is cut by taking the maximum depth as one side of the triangular prism, and the C surface is adhered to the back hand position by glue to ensure that the hand does not extend into the back hand position to have a structure of more than 90 degrees.
4. The molding method for preventing sand sticking as claimed in claim 1, wherein the stepped groove is buried by foam blocks, the width W of the stepped groove is less than 50mm, the stepped groove is blocked, the width W of the stepped groove is less than the depth H of the stepped groove and less than 100mm, the depth H of the stepped groove to the stepped groove is less than the width W of the stepped groove, the width W of the stepped groove is greater than 100mm, and the depth H of the stepped groove to the stepped groove is less than or equal to 1.5.
5. The molding method for preventing sand sticking as claimed in claim 1, wherein said working surface and said ribs are buried approximately by cutting the block of foam with a small knife to 10mm below the working surface.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110944138.7A CN113634713B (en) | 2021-08-17 | 2021-08-17 | Molding method for preventing sand adhesion |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110944138.7A CN113634713B (en) | 2021-08-17 | 2021-08-17 | Molding method for preventing sand adhesion |
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| CN113634713A true CN113634713A (en) | 2021-11-12 |
| CN113634713B CN113634713B (en) | 2023-04-07 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101419641A (en) * | 2008-11-06 | 2009-04-29 | 四川集成天元模具制造有限公司 | Method for processing FM by FMC in layer |
| CN103801654A (en) * | 2012-11-06 | 2014-05-21 | 北汽福田汽车股份有限公司 | Method used for manufacturing die foam full model |
| CN104785715A (en) * | 2014-04-30 | 2015-07-22 | 天津虹冈铸钢有限公司 | Casting method capable of preventing coarse graphite on surface of convex model |
| CN104785717A (en) * | 2014-05-20 | 2015-07-22 | 天津虹冈铸钢有限公司 | Mould casting process capable of preventing deformation of casting |
| CN107737873A (en) * | 2017-10-19 | 2018-02-27 | 芜湖久弘重工股份有限公司 | A kind of cavityless casting method of Large Grinder Body |
-
2021
- 2021-08-17 CN CN202110944138.7A patent/CN113634713B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101419641A (en) * | 2008-11-06 | 2009-04-29 | 四川集成天元模具制造有限公司 | Method for processing FM by FMC in layer |
| CN103801654A (en) * | 2012-11-06 | 2014-05-21 | 北汽福田汽车股份有限公司 | Method used for manufacturing die foam full model |
| CN104785715A (en) * | 2014-04-30 | 2015-07-22 | 天津虹冈铸钢有限公司 | Casting method capable of preventing coarse graphite on surface of convex model |
| CN104785717A (en) * | 2014-05-20 | 2015-07-22 | 天津虹冈铸钢有限公司 | Mould casting process capable of preventing deformation of casting |
| CN107737873A (en) * | 2017-10-19 | 2018-02-27 | 芜湖久弘重工股份有限公司 | A kind of cavityless casting method of Large Grinder Body |
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| Publication number | Publication date |
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| CN113634713B (en) | 2023-04-07 |
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