CN114147176B - Edge pressing ring molding process of stamping die - Google Patents
Edge pressing ring molding process of stamping die Download PDFInfo
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- CN114147176B CN114147176B CN202111403728.5A CN202111403728A CN114147176B CN 114147176 B CN114147176 B CN 114147176B CN 202111403728 A CN202111403728 A CN 202111403728A CN 114147176 B CN114147176 B CN 114147176B
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- pressing ring
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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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/22—Moulds for peculiarly-shaped castings
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Abstract
The invention provides a molding process of a blank holder of a stamping die, which comprises the steps of firstly carrying out water-based coating on a white die to ensure high temperature resistance, then carrying out foam reinforcement operation on a die cavity part, and reinforcing and supporting rib plate parts at all positions by foam to play a role in controlling and reducing deformation in advance in the molding process; then controlling the total gap between the bottom surface of the blank holder and the platform to be less than or equal to 3mm; then, starting from the periphery of the blank holder, namely carrying out sand burying and fixing in the X/Y plane direction, after sand is buried to the position of 2/3 of the thickness of the model, scattering a layer of sand to install a layer of net frame, avoiding sand layering, and timely punching a clamp to fix the sand frame; finally, installing a bottom net, and finishing the molding of the molded surface, so that the molded edge pressing ring has the outline dimension precision of less than or equal to 3mm, and the problem that the edge pressing ring is easy to deform is solved.
Description
Technical Field
The invention relates to the field of stamping die edge pressing rings, in particular to a stamping die edge pressing ring molding process.
Background
The deformation prevention is the most important technology in the lost foam casting process, and is a difficult problem, firstly, the lost foam casting is easily deformed due to the influence of the flexibility of the main material foam and the light load; secondly, the casting process is influenced by a series of factors such as long-time placement, water-based coating curtain coating, drying and molding processes, casting sand box placement and the like, and as the factors are not single, the measures and methods for preventing deformation need to be comprehensively considered. From the structural analysis of the automobile body panel, the automobile body panel is divided into an inner part and an outer part, wherein the inner part is mainly a process and structural panel, the other part is mainly an automobile body panel, the automobile body panel directly influences the appearance of an automobile body, a pleasant aesthetic feeling and texture are presented to consumers, even the aesthetic feeling and the consumption desire of the consumers on the automobile are directly influenced, and the quality of the automobile body panel is influenced firstly by the quality of a stamping die. Two types of difficult problems of deformation are solved in the casting process of numerous lost foam, namely a side wall type slender strip-shaped structural member in the outer covering piece of the automobile body; such as side wall cores: ZL 201911140407.3 discloses a casting process of a side pressure core of an outer covering part of a side wall of an automobile die; the other type is a frame-shaped structure which is used for blanking in the stamping process of the automobile body panel; such as a bead ring; these two variants are typically represented in stamping dies, the quality of which mainly affects the overall appearance and aesthetic appeal of the "four-door three-cover" automobile. The problem of deformation control in the lost foam casting process of the blank holder is thoroughly solved, the blank holder structure is a typical frame-type structure, namely a non-solid structure, and the molded surface is supported by a circle of process ejector rods, and the blank holder is of a single thin structure and is easy to deform. The edge pressing ring has the main functions of: in the forming process of the stamping combined die set, main functions of fixing and clamping (or supporting), shaping, jacking and the like are carried out on a car body panel (sheet material) in the die assembly stamping process mainly through draw beads around the blank holder; and (3) preliminarily forming the side wall outer covering piece sheet materials on two sides of the automobile. The sheet member formed by stamping has high forming dimensional accuracy, and the manufacturing size of the blank holder is particularly important to control in the process. How to control the dimensional accuracy of the blank holder, a set of more mature and effective process method is needed to control the whole lost foam casting process; the problem of deformation in the production process of the blank holder is actually how to control. The problem of deformation is solved, and the problem of the size precision of the whole blank holder is solved.
Disclosure of Invention
In order to solve the problems, the invention provides a molding process of a blank mold edge pressing ring, which comprises the steps of firstly carrying out water-based coating on a blank mold to ensure high temperature resistance, then carrying out foam reinforcement operation on a mold cavity part, and reinforcing and supporting rib plate parts at all positions by using foam to play a role in controlling and reducing deformation in advance in a molding process; then controlling the total gap between the bottom surface of the blank holder and the platform to be less than or equal to 3mm; then, starting from the periphery of the blank holder, namely carrying out sand burying and fixing in the X/Y plane direction, after sand is buried to the position of 2/3 of the thickness of the model, scattering a layer of sand to install a layer of net frame, avoiding sand layering, and timely punching a clamp to fix the sand frame; finally, the bottom net is installed, the molding surface molding is finished, and the molding outline dimension precision of the molded blank holder reaches less than or equal to 3mm, so that the problems in the background technology are solved.
The invention aims to provide a molding process of a blank holder of a stamping die, which comprises the following steps:
step one: performing water-based paint curtain coating operation on the qualified blank pressing ring white mold, and then sending the blank pressing ring white mold into a drying room for baking; after the baked model is discharged, the model cavity part is subjected to foam reinforcement operation, and the rib plate parts at all positions are reinforced and supported by foam;
step two: before modeling, detecting a platform: the modeling platform is used as a modeling reference surface, a rod ruler and a clearance ruler are used for detecting the platform before modeling, and the flatness of the platform is ensured to be within 3mm and meets modeling requirements;
step three: X/Y plane prevents three controls: setting a pouring system, and arranging a middle frame, wherein the sand spraying process is carried out from outside to inside, and sand burying and molding are carried out from the periphery of the blank holder, namely from the X/Y plane direction;
when the molding sand is buried to the position 2/3 of the thickness of the mold, the remaining molding sand is hardened to well fix the mold, then the sand burying process is continued, a layer of sand is scattered to install a layer of net frame, the sand is prevented from layering, and a clamp is timely pressed to fix the sand frame; and finally, installing a bottom net, and finishing the molding surface molding.
The further improvement is that: step two, detecting the deformation of the bottom surface of the model before modeling: the key point is to detect in sections, detect a point every 500mm, and the total gap between the bottom surface of the blank holder and the platform is controlled to be less than or equal to 3mm.
The further improvement is that: when the detection gap in the second step is larger than 3mm, using a standard 10kg detection weight to perform lamination, detecting the lamination gap after lamination for 10 minutes, and placing the weight on a re-pressing point at the moment still to wait for the sand burying process; and thirdly, removing the weight when the molding sand is buried to the position of 2/3 of the thickness of the model.
The further improvement is that: the method also comprises the following steps of secondary control deformation in the vertical direction:
(1) According to different materials, after the molding surface molding is finished and the molding sand hardening strength is detected to be qualified, turning over can be performed, and then bottom surface molding is performed; finally, a negative pressure net is thickened, the thickness of molding sand is increased, and the reaction force of the molding sand to the tension of molten iron in the casting process is increased;
(2) In order to prevent the expansion box from deforming caused by the tension of molten iron in the pouring process, the weight of the counterweight is determined according to the weights of castings made of different materials to ensure the balance of the molten iron acting force and the counter-acting force of the counterweight in the pouring process.
The further improvement is that: the iron liquid is gray iron, and the weight is 3-5 times of the casting; the molten iron is ductile iron, and the weight is 5-7 times of the casting.
The further improvement is that: the drying temperature in the first step is 60 ℃, and the drying time is 24 hours.
The further improvement is that: the land size of the molding was long x width = 6000 x 3600mm.
The invention has the beneficial effects that: 1. according to the invention, the white mold is subjected to water-based coating curtain coating to ensure high temperature resistance, then foam reinforcement operation is performed on the mold cavity part, and the rib plate parts at all positions are reinforced and supported by foam, so that the deformation is controlled in advance and reduced in the molding process; then controlling the total gap between the bottom surface of the blank holder and the platform to be less than or equal to 3mm; then, starting from the periphery of the blank holder, namely carrying out sand burying and fixing in the X/Y plane direction, after sand is buried to the position of 2/3 of the thickness of the model, scattering a layer of sand to install a layer of net frame, avoiding sand layering, and timely punching a clamp to fix the sand frame; finally, installing a bottom net, and finishing the molding of the molded surface, wherein the molding outline size precision of the molded blank holder is less than or equal to 3mm;
2. according to the invention, the overall gap between the bottom surface of the blank holder and the platform is ensured to be less than or equal to 3mm by detecting one point every 500mm, so that the accuracy of the bottom surface of the blank holder is ensured;
3. the invention comprises primary and secondary control deformation in the vertical direction, and the deformation in the vertical direction is controlled twice, so that the deformation of the blank holder in the vertical direction is ensured as much as possible;
4. the X/Y plane of the invention comprises a primary plane control deformation: the internal supporting points prevent the plane deformation of the blank holder; secondary plane control deformation: a modeling platform with the flatness of 3mm is used as a modeling reference surface; three-time plane control deformation: the sanding process is carried out from outside to inside (sand burying and molding are carried out from the periphery of the blank holder, namely, the X/Y plane direction is adopted, and the deformation is controlled for three times, so that the X/Y plane direction of the blank holder is ensured not to be deformed.
Drawings
FIG. 1 is a schematic view of various sections of a binder ring according to an embodiment.
Detailed Description
The present invention will be further described in detail with reference to examples, which are provided for the purpose of illustration only and are not intended to limit the scope of the present invention.
The embodiment provides a molding process of a blank holder of a stamping die, which comprises the following steps:
s1: model curtain coating and reinforcement operation-internal supporting point prevention edge pressing ring plane deformation, primary plane control deformation:
performing water-based paint curtain coating operation on the qualified blank holder white mould, and then sending the blank holder white mould into a drying room for baking, wherein the baking temperature is 60 ℃, and the baking time is 24 hours; after the baked model is discharged, the model cavity part is subjected to foam reinforcement operation, and the rib plate parts at all positions are reinforced and supported by foam, so that the functions of controlling the modeling process in advance and reducing deformation are achieved;
s2: the X/Y plane is combined with the vertical direction to prevent deformation; secondary plane control deformation:
(1) Before modeling, detecting a platform: a modeling platform with length/width=6000/3600 mm is used as a modeling reference surface, and a rod ruler and a clearance ruler are used for detecting the platform before modeling, so that the flatness of the platform is ensured to be within 3mm and meets modeling requirements;
(2) Detecting the deformation of the bottom surface of the model before modeling: detecting in sections, detecting a point every 500mm, and controlling the total gap between the bottom surface of the blank holder and the platform to be less than or equal to 3mm;
(3) Deformation is controlled once in the vertical direction: if the gap is larger than 3mm, a 10kg standard detecting weight is used for pressing, the pressing gap is detected to meet the requirement after pressing for 10 minutes, and the weight is still placed on a pressing point, so that the parallelism between the bottom surface of the blank holder model and the reference surface of the platform is ensured to meet the requirement in the vertical direction;
s3: X/Y plane prevents three controls: setting a pouring system, and arranging a middle frame, wherein the sand spraying process is implemented from outside to inside: the compaction control of sand burying is implemented by the molding, and sand burying and molding is carried out from the periphery of the blank holder, namely from the X/Y plane direction;
the molding sand reacts with the resin and the curing agent respectively quickly, and the molding sand hardening is controlled to start for 8-12 minutes, so that when the molding sand is buried to the 2/3 position of the thickness of the mold, the mold is well solidified by the molding sand hardening, the sand burying process is continued, a layer of sand is scattered to install a layer of net frame, the sand is prevented from layering, and a clamp is timely pressed to fix the sand frame; finally, installing a bottom net, and finishing the molding surface;
s4: secondary control deformation in the vertical direction:
(1) The molding sand strength is controlled to meet the requirement for 4 hours before casting, and according to different materials, the molding sand can turn over after the molding sand hardening strength is detected to be qualified after the molding surface molding is finished, and then the bottom surface molding is carried out; finally, a thickened negative pressure net is arranged, and the height of the negative pressure net is improved from the original t=300 mm to the height t=400 mm through experiments, so that the thickness of the molding sand is increased, and the reaction force of the molding sand to the tension of molten iron in the pouring process is increased;
(2) In order to prevent the expansion box from deforming caused by the tension of molten iron in the pouring process, the weight of the counterweight is determined according to the weight of castings made of different materials to ensure the balance between the acting force of the molten iron and the counter-acting force of the counterweight in the pouring process, so that the purpose of controlling the deformation is achieved; the iron liquid is gray iron, and the counterweight is 4 times of the casting; the molten iron is ductile iron, and the counterweight is 6 times of the casting.
The white mold is coated with the water-based coating to ensure high temperature resistance, foam reinforcement operation is performed on the mold cavity part, foam is used for reinforcement and support at each rib plate part, and the functions of controlling the molding process in advance and reducing deformation are achieved; then controlling the total gap between the bottom surface of the blank holder and the platform to be less than or equal to 3mm; then, starting from the periphery of the blank holder, namely carrying out sand burying and fixing in the X/Y plane direction, after sand is buried to the position of 2/3 of the thickness of the model, scattering a layer of sand to install a layer of net frame, avoiding sand layering, and timely punching a clamp to fix the sand frame; finally, installing a bottom net, and finishing the molding of the molded surface, wherein the molding outline size precision of the molded blank holder is less than or equal to 3mm; the method comprises three times of control deformation in the X/Y plane direction and two times of control deformation in the vertical direction, and the modeling of the blank holder is ensured to meet the requirements as much as possible.
The steps are checked by data until the casting is formed: the following table data compares:
the corresponding segments of L1-L7 are shown in FIG. 1;
from this table it follows that this embodiment achieves the intended aim: the contour dimension precision of the edge pressing ring is controlled to be 3mm.
Claims (4)
1. The molding process of the blank holder of the stamping die is characterized by comprising the following steps of: the method comprises the following steps:
step one: primary plane control deformation: performing water-based paint curtain coating operation on the qualified blank pressing ring white mold, and then sending the blank pressing ring white mold into a drying room for baking; after the baked model is discharged, the model cavity part is subjected to foam reinforcement operation, and the rib plate parts at all positions are reinforced and supported by foam;
step two: secondary plane control deformation: before modeling, detecting a platform: the modeling platform is used as a modeling reference surface, a rod ruler and a clearance ruler are used for detecting the platform before modeling, and the flatness of the platform is ensured to be within 3mm and meets modeling requirements;
step three: three-time plane control deformation: setting a pouring system, and arranging a middle frame, wherein the sand spraying process is carried out from outside to inside, and sand burying and molding are carried out from the periphery of the blank holder, namely from the X/Y plane direction;
when the molding sand is buried to the position 2/3 of the thickness of the mold, the remaining molding sand is hardened to well fix the mold, then the sand burying process is continued, a layer of sand is scattered to install a layer of net frame, the sand is prevented from layering, and a clamp is timely pressed to fix the sand frame; finally, installing a bottom net, and finishing the molding surface;
step two, detecting the deformation of the bottom surface of the model before modeling: detecting in sections, detecting a point every 500mm, and controlling the total gap between the bottom surface of the blank holder and the platform to be less than or equal to 3mm; when the detection gap is larger than 3mm, using a standard 10kg detection weight to press, detecting the pressing gap to meet the requirement after pressing for 10 minutes, placing the weight on a pressing point, waiting for a sand burying process, and removing the weight when the molding sand is buried to the 2/3 position of the thickness of the model in the third step, wherein the deformation is controlled in one time in the vertical direction; the method also comprises the following steps of secondary control deformation in the vertical direction:
(1) According to different materials, after the molding surface molding is finished and the molding sand hardening strength is detected to be qualified, turning over can be performed, and then bottom surface molding is performed; finally, a negative pressure net is thickened, the thickness of molding sand is increased, and the reaction force of the molding sand to the tension of molten iron in the casting process is increased;
(2) In order to prevent the expansion box from deforming caused by the tension of molten iron in the pouring process, the weight of the counterweight is determined according to the weights of castings made of different materials so as to ensure the balance between the molten iron acting force and the counter-acting force of the counterweight in the pouring process.
2. The stamping die edge-pressing ring molding process as claimed in claim 1, wherein: the molten iron is gray iron, and the weight is 3-5 times of the casting; the molten iron is ductile iron, and the weight is 5-7 times of the casting.
3. The stamping die edge-pressing ring molding process as claimed in claim 1, wherein: the drying temperature in the first step is 60 ℃, and the drying time is 24 hours.
4. The stamping die edge-pressing ring molding process as claimed in claim 1, wherein: the land size of the molding was long x width = 6000 x 3600mm.
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| CN202111403728.5A CN114147176B (en) | 2021-11-24 | 2021-11-24 | Edge pressing ring molding process of stamping die |
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| CN202111403728.5A CN114147176B (en) | 2021-11-24 | 2021-11-24 | Edge pressing ring molding process of stamping die |
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| CN114147176A CN114147176A (en) | 2022-03-08 |
| CN114147176B true CN114147176B (en) | 2023-05-26 |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102228955A (en) * | 2011-07-01 | 2011-11-02 | 李复旺 | Treatment method for deformation of massive lost foam |
| CN105344940A (en) * | 2015-12-07 | 2016-02-24 | 兴化市雅兰机械制造有限公司 | Motor casing expendable pattern casting process |
| CN109434012A (en) * | 2018-12-31 | 2019-03-08 | 兴化市剑达铸造有限公司 | A kind of lost foam casting process of high-mechanical property casting |
| CN110947914A (en) * | 2019-11-20 | 2020-04-03 | 芜湖泓鹄材料技术有限公司 | Casting process for side pressing core of side wall outer covering part of automobile mold |
| CN213645780U (en) * | 2020-10-16 | 2021-07-09 | 芜湖新兴新材料产业园有限公司 | K-shaped ductile iron pipe fitting anti-deformation sand lining ring and sand lining ring forming die |
| CN113560498A (en) * | 2021-07-12 | 2021-10-29 | 芜湖泓鹄材料技术有限公司 | Casting process of side wall blank holder of automobile stamping die |
-
2021
- 2021-11-24 CN CN202111403728.5A patent/CN114147176B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102228955A (en) * | 2011-07-01 | 2011-11-02 | 李复旺 | Treatment method for deformation of massive lost foam |
| CN105344940A (en) * | 2015-12-07 | 2016-02-24 | 兴化市雅兰机械制造有限公司 | Motor casing expendable pattern casting process |
| CN109434012A (en) * | 2018-12-31 | 2019-03-08 | 兴化市剑达铸造有限公司 | A kind of lost foam casting process of high-mechanical property casting |
| CN110947914A (en) * | 2019-11-20 | 2020-04-03 | 芜湖泓鹄材料技术有限公司 | Casting process for side pressing core of side wall outer covering part of automobile mold |
| CN213645780U (en) * | 2020-10-16 | 2021-07-09 | 芜湖新兴新材料产业园有限公司 | K-shaped ductile iron pipe fitting anti-deformation sand lining ring and sand lining ring forming die |
| CN113560498A (en) * | 2021-07-12 | 2021-10-29 | 芜湖泓鹄材料技术有限公司 | Casting process of side wall blank holder of automobile stamping die |
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