CN102107481A - Method for controlling dimensional precision of rotational molding formed hollow products - Google Patents
Method for controlling dimensional precision of rotational molding formed hollow products Download PDFInfo
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- CN102107481A CN102107481A CN2010105828960A CN201010582896A CN102107481A CN 102107481 A CN102107481 A CN 102107481A CN 2010105828960 A CN2010105828960 A CN 2010105828960A CN 201010582896 A CN201010582896 A CN 201010582896A CN 102107481 A CN102107481 A CN 102107481A
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- 238000000034 method Methods 0.000 title claims abstract description 17
- 238000001175 rotational moulding Methods 0.000 title abstract description 25
- 238000000465 moulding Methods 0.000 claims abstract description 14
- 230000009471 action Effects 0.000 claims abstract description 4
- 239000004033 plastic Substances 0.000 claims description 11
- 229920003023 plastic Polymers 0.000 claims description 11
- 230000008602 contraction Effects 0.000 claims description 5
- 238000005096 rolling process Methods 0.000 claims description 4
- 238000007493 shaping process Methods 0.000 abstract description 4
- 239000000047 product Substances 0.000 description 100
- 239000002828 fuel tank Substances 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 238000001816 cooling Methods 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 239000004698 Polyethylene Substances 0.000 description 2
- 230000000712 assembly Effects 0.000 description 2
- 238000000429 assembly Methods 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- -1 polyethylene Polymers 0.000 description 2
- 229920000573 polyethylene Polymers 0.000 description 2
- 230000008859 change Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000012467 final product Substances 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 230000004927 fusion Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000001149 thermolysis Methods 0.000 description 1
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Abstract
The invention relates to a method for controlling the dimensional precision of rotational molding formed hollow products, wherein a dimension shaping fixture is made in advance. After the step of de-molding the products and before the step of shaping the products, the method comprises the following steps: 1) holding the product after being de-molded on the dimension shaping fixture; 2) arranging an aerating port and an exhaust port on the product, and filling compressed air into an inner cavity of the product from the aerating port till the positive air pressure endured by the inner cavity of the product is 0.2-0.3MPa; 3) gradually adjusting an opening and closing distance along the action direction of a holding part by an operator, stopping adjusting the holding part when the size required to be controlled reaches the corresponding nominal dimension of the product, and meanwhile, controlling the air pressure of the inner cavity of the product within the range of 0.4-0.5 Mpa in the step 3); 4) keeping the air pressure of the inner cavity of the product within the range of 0.4-0.5 MPa till the product is completely solidified; and 5) stopping aerating, releasing the holding part, and taking off the product. By using the method provided by the invention, the dimensional precision level of rotational molding products is greatly increased.
Description
Technical field
The present invention relates to the preparation method of rotation molding hollow series products, be specifically related to a kind of rotation molding hollow series products dimensional accuracy control method.So-called rotation molding hollow series products is meant the plastic hollow series products of producing with rotation molding (also claiming rotational forming or rotation-formed) technology, such as fuel tank, the water tank of engineering machinery aspect, parts such as the bonnet on the automobile, air inlet pipe, blast pipe, the various containers of chemical industry aspect, and the car and boat housing of various hollows.
Background technology
Rotation molding is also named rotational forming or rotation-formed.Be about to powdered plastic and join in the close die, mould is heated in rotation, and the plastics fusion also invests cavity surface equably, can obtain the plastic hollow goods identical with the die cavity shape after the mold cools down.This method has that product wall thickness is easy to control, die cost is lower, production efficiency height, the not advantage of easy to leak.So existing plastic hollow series products, especially fuel tank, water tank, pressure vessels for the chemical industry etc. are more to be made with roll moulding shaping technology.
For the making of rotation molding hollow series products (such as rotational moulding fuel tank), form by basic steps such as reinforced, envelope mould, heating, cooling, the demoulding, typings usually.At present, the operation of the fixating shape step when rotation molding hollow series products is made is: product is directly being placed after the demoulding (the product surface temperature is about 70 ℃ during the general demoulding) lowered the temperature, make it nature and shrink and to finish, to the not in addition any control of its contraction process.Therefore, the control of its product size only relies on following way: the designer estimates the theoretical shrinkage factor of product (being casing) behind demoulding by experimental data and personal experience, calculate theoretical shrinkage value b, and the nominal dimension a of known product (being casing), then the cavity dimension with mould is designed to product (being casing) nominal dimension a and theoretical shrinkage value b sum, after product (the being casing) demoulding cooling, promptly can be retracted to nominal dimension a so theoretically, satisfy the requirement of size.But in the actual processing, actual shrinkage factor is to be difficult to estimate, directly is subjected to the influence of product size, shape, structure and material property, environment temperature, stripping rate variation.At present, only depend on the designer to estimate that by experimental data and personal experience shrinkage factor comes controlling dimension, be difficult to guarantee the dimensional accuracy of actual product, be prone to significantly deviation, for example same batch of different size causes substandard products.For example, existing often the appearance because the rotational moulding fuel tank dimensional discrepancy of actual production is big, and can't be installed on the frame that former design matches, even can't install fuel level sensor therein additional.
So, how can accurately control the size of rotation molding hollow series products, be that industry technical staff fails the problem that solves and break through always.
Summary of the invention
The object of the invention provides a kind of rotational moulding hollow series products dimensional accuracy control method, and the rotational moulding hollow series products dimensional discrepancy that exists with the solution prior art is big, uncontrollable problem.
For achieving the above object, the technical solution used in the present invention is: a kind of rotation molding hollow series products dimensional accuracy control method, and the size of Plastic Rolling Molds die cavity equals the nominal dimension and the theoretical shrinkage value sum of product correspondence;
Make size typing anchor clamps in advance, this size is finalized the design anchor clamps on the direction that needs the controlling dimension precision, but is provided with the hold assembly of at least one folding adjustable range corresponding to the product wall;
After product stripping, to the product approval, operate according to the following steps:
The first step: the product after the demoulding is clamped on the described size typing anchor clamps, and wherein, described hold assembly acts on the pairing wall of product needed controlling dimension precision direction;
Second step: product is provided with inflation inlet and exhaust outlet, inflation inlet, product cavity to exhaust outlet constitute one and fill the exhaust passage, wherein, the area of section of inflation inlet is greater than the area of section of exhaust outlet, charge into compressed air by inflation inlet to product cavity, make the air pressure of product cavity maintain 0.2～0.3MPa;
The 3rd step: along with product constantly cools off contraction, operating personnel progressively regulate the folding distance on the hold assembly action direction, hold assembly is followed when product shrinks be resisted against on the product sidewall; When the size of needs control reaches the nominal dimension of correspondence on the product, stop to regulate hold assembly, strengthen the compressed-air actuated amount of charging into simultaneously, make the air pressure of product cavity maintain 0.4～0.5MPa;
The 4th step: the air pressure when product cavity keeps the 3rd EOS solidifies fully until product and stops to shrink;
The 5th step: stop inflation, unclamp hold assembly, take off product.
Related content in the technique scheme is explained as follows:
1, in the such scheme, the standard size the when nominal dimension of described product is meant product design.
2, in the such scheme, described " size typing anchor clamps " are not limited to certain concrete structure, as long as it on the direction that needs the controlling dimension precision, is provided with hold assembly corresponding to hollow series products wall and gets final product.Described " this size typing anchor clamps are on the direction that needs the controlling dimension precision; but be provided with the hold assembly of at least one folding adjustable range corresponding to the product wall ", be meant position, the hold assembly that acts on hollow series products wall is set on its dimensional directions corresponding to the required accurate controlling dimension of hollow series products.
For the size of required control on the hollow series products, can be the local size (comprising the geometry size) on hollow series products overall height dimension, width dimensions, length dimension or the hollow series products, as certain protuberance height dimension etc.In general, the size at the position that need use when the size of required control promptly is the installation of hollow series products on the hollow series products, for example rotational moulding material fuel tank can be with itself and the height of frame cooperation place and the width dimensions size as needs control, the location with the finalize the design hold assembly clamping of anchor clamps of size.
4, in the such scheme, described inflation inlet and exhaust outlet can be just to produce when the rotational moulding of hollow series products, also can offer in the above after the demoulding of hollow series products again.
5, in the such scheme, described exhaust outlet can be single steam vent, also can constitute by a plurality of steam vents, these a plurality of steam vents can dispersed placement on the hollow series products everywhere.
Operation principle of the present invention is: the control of centering empty class product size precision of the present invention is to rely on following 2 points: the one, like that with the nominal dimension that is designed and sized to hollow series products correspondence and the theoretical shrinkage value sum of Plastic Rolling Molds die cavity, guarantee that the hollow series products can be retracted to nominal dimension along with lowering the temperature by prior art theoretically after the demoulding; The 2nd, after the demoulding of hollow series products to the hollow series products typing, adopt size typing anchor clamps the hollow series products from outside clamping, charging into compressed air simultaneously in hollow series products inside makes inner chamber air pressure arrive certain value, form certain pressure reduction with the normal pressure in the external world, promptly one interior one compress hollow series products sidewall outward, thereby slowing down and controlled the contraction speed of product wall effectively.When central especially empty class product is contracted to nominal dimension, the air pressure of the inner inner chamber that strengthens of hollow series products, and hollow series products outside has the roof pressure of hold assembly of size typing anchor clamps spacing, with this hollow series products sidewall being finalized the design for solidifying fully until the hollow series products in this nominal dimension stops to shrink, strict guarantee the precision of size.
Because the technique scheme utilization, the present invention compared with prior art has following advantage and effect:
Because application of the present invention, significantly improved the dimensional accuracy of rotational moulding hollow series products, for example (,) the product of polyethylene material basic size 450mm～500mm the controlled size precision on the direction that hold assembly acted on built in ± 0.6mm(is that tolerance is 1.2 mm) in.Dimensional accuracy grade national standard (SJ1372-78) regulation according to plastic products, the product margin of tolerance of basic size 450mm～500mm has been exactly 3 class precisions 1.1mm's, the margin of tolerance is 4 class precisions 1.6mm's, so the accuracy class of the said goods has approached 3 grades, and by the product of dimensional accuracy grade national standard (SJ1372-78) the regulation polyethylene material of plastic products as long as 5 class precision grades are exactly high accuracy, so 3 class precision grades can be superhigh precision.
Description of drawings
Schematic diagram when accompanying drawing 1 is used for the embodiment of the invention.
In the above accompanying drawing, 1, the rotational molding diesel case; 2, size typing anchor clamps; 3, hold assembly; 4, screw rod; 5, inflation inlet; 6, exhaust outlet; 7, compressed air; 8, operating portion.
The specific embodiment
Below in conjunction with drawings and Examples the present invention is further described:
Embodiment:
A kind of rotation molding hollow series products dimensional accuracy control method, the size of Plastic Rolling Molds die cavity equals the nominal dimension and the theoretical shrinkage value sum of product correspondence.
Make size typing anchor clamps in advance, this size is finalized the design anchor clamps on the direction that needs the controlling dimension precision, but is provided with the hold assembly of at least one folding adjustable range corresponding to the product wall.
After product stripping, to the product approval, operate according to the following steps:
The first step: the product after the demoulding is clamped on the described size typing anchor clamps, and wherein, described hold assembly acts on the pairing wall of product needed controlling dimension precision direction;
Second step: product is provided with inflation inlet and exhaust outlet, inflation inlet, product cavity to exhaust outlet constitute one and fill the exhaust passage, wherein, the area of section of inflation inlet is greater than the area of section of exhaust outlet, charge into compressed air by inflation inlet to product cavity, make the air pressure of product cavity maintain 0.2～0.3MPa; For the air pressure that keeps product cavity at 0.2～0.3MPa, in general, the compressed air gas source pressure of employing should be 0.8～1.0MPa, the control flow is 1.2～2m
3/ min.
The 3rd step: along with product constantly cools off contraction, operating personnel progressively regulate the folding distance on the hold assembly action direction, hold assembly is followed when product shrinks be resisted against on the product sidewall; When the size of needs control reaches the nominal dimension of correspondence on the product, stop to regulate hold assembly, strengthen the compressed-air actuated amount of charging into (promptly improving flow) simultaneously, make the air pressure of product cavity maintain 0.4～0.5MPa;
The 4th step: the air pressure when product cavity keeps the 3rd EOS solidifies fully until product and stops to shrink; In general, product temperature is reduced to putting behind the normal temperature naturally just can to solidify fully after cooling a period of time again and is stopped to shrink, and is to decide by concrete condition during this period of time, as 15～20 minutes possibly summer, 5～10 minutes winters.
The 5th step: stop inflation, unclamp hold assembly, take off product.
For the safety of assurance, from working specification, but the predetermined operation personnel after the air pressure that must wait for product inside is reduced to normal pressure, take off product just can unclamp hold assembly after stopping inflation.
As shown in Figure 1, be applied to the schematic diagram of rotational molding diesel case 1 for this method.What rotational molding diesel case 1 needed accurately control is the height dimension and the width dimensions at middle part, so as shown in Figure 1, size typing anchor clamps 2 are a support shape structure that is overlapped to form by many metallic rod, side wall on it on corresponding rotational molding diesel case 1 height dimension direction is provided with six hold assemblies 3, and the right side wall on the corresponding rotational molding diesel case 1 width dimensions direction is provided with four hold assemblies 3, and hold assembly 3 all is to be threaded through screw rod 4 to be arranged on the metallic rod of size typing anchor clamps 2, holds on the sidewall that parts 3 press on rotational molding diesel case 1 by operating portion 8 adjustable clamp of adjusting screw(rod) tail end; And, as shown in Figure 1, compressed air 7 is charged in rotational molding diesel case 1 inner chamber by inflation inlet 5, and a spot of air is discharged through exhaust outlet 6 again, in rotational molding diesel case 1 inner chamber, carry out circulation of air and reach thermolysis, and keep the malleation of the certain value of rotational molding diesel case 1 inner chamber.At rotational molding diesel case 1 as shown in Figure 1, consider its size, shape, the inner chamber air pressure of the rotational molding diesel case 1 in above-mentioned second step can be controlled in about 0.25MPa, and the inner chamber air pressure of rotational molding diesel case 1 can be controlled in about 0.35MPa in the 3rd step.
Above-mentioned size typing anchor clamps 2 are at the illustrating of rotational molding diesel case 1, in the practical application, and the size of available other structures typing anchor clamps 2, the described size typing of this method anchor clamps are not subjected to the structural limitations of size typing anchor clamps 2 as shown in the figure.
The product that the control method of present embodiment is suitable for is not limited to rotational molding diesel case 1, applicable to various rotational moulding hollow products, such as fuel tank, the water tank of engineering machinery aspect, parts such as the bonnet on the automobile, air inlet pipe, blast pipe, the various containers of chemical industry aspect, and the car and boat housing of various hollows.
The foregoing description only is explanation technical conceive of the present invention and characteristics, and its purpose is to allow the personage who is familiar with this technology can understand content of the present invention and enforcement according to this, can not limit protection scope of the present invention with this.All equivalences that spirit essence is done according to the present invention change or modify, and all should be encompassed within protection scope of the present invention.
Claims (1)
1. rotation molding hollow series products dimensional accuracy control method, the size of Plastic Rolling Molds die cavity equals the nominal dimension and the theoretical shrinkage value sum of product correspondence, it is characterized in that:
Make size typing anchor clamps in advance, this size is finalized the design anchor clamps on the direction that needs the controlling dimension precision, but is provided with the hold assembly of at least one folding adjustable range corresponding to the product wall;
After product stripping, to the product approval, operate according to the following steps:
The first step: the product after the demoulding is clamped on the described size typing anchor clamps, and wherein, described hold assembly acts on the pairing wall of product needed controlling dimension precision direction;
Second step: product is provided with inflation inlet and exhaust outlet, inflation inlet, product cavity to exhaust outlet constitute one and fill the exhaust passage, wherein, the area of section of inflation inlet is greater than the area of section of exhaust outlet, charge into compressed air by inflation inlet to product cavity, make the air pressure of product cavity maintain 0.2～0.3MPa;
The 3rd step: along with product constantly cools off contraction, operating personnel progressively regulate the folding distance on the hold assembly action direction, hold assembly is followed when product shrinks be resisted against on the product sidewall; When the size of needs control reaches the nominal dimension of correspondence on the product, stop to regulate hold assembly, strengthen the compressed-air actuated amount of charging into simultaneously, make the air pressure of product cavity maintain 0.4～0.5MPa;
The 4th step: the air pressure when product cavity keeps the 3rd EOS solidifies fully until product and stops to shrink;
The 5th step: stop inflation, unclamp hold assembly, take off product.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010582896 CN102107481B (en) | 2010-12-10 | 2010-12-10 | Method for controlling dimensional precision of rotational molding formed hollow products |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010582896 CN102107481B (en) | 2010-12-10 | 2010-12-10 | Method for controlling dimensional precision of rotational molding formed hollow products |
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| CN102107481A true CN102107481A (en) | 2011-06-29 |
| CN102107481B CN102107481B (en) | 2013-07-10 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104723586A (en) * | 2013-12-20 | 2015-06-24 | 浙江工商职业技术学院 | Enzyme box production process |
| CN112836251A (en) * | 2021-01-20 | 2021-05-25 | 合兴汽车电子股份有限公司 | Method and system for collecting product shrinkage rate accuracy |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1992016352A2 (en) * | 1991-03-21 | 1992-10-01 | Minnesota Mining And Manufacturing Company | Apparatus and method for constraining a rotating tube of material |
| CN1241476A (en) * | 1999-07-08 | 2000-01-19 | 王峰 | Steel net-reinforced hollow plastic product and its rolling forming process |
| JP2005074957A (en) * | 2003-09-03 | 2005-03-24 | Bridgestone Corp | Die for foam molding, urethane foam and its production method |
| JP2006069159A (en) * | 2004-09-06 | 2006-03-16 | Bridgestone Corp | Foam molding mold and foam molding method |
| CN101344199A (en) * | 2008-08-15 | 2009-01-14 | 付志敏 | Rotational molding plastic composite pipes with steel rings and manufacturing method thereof |
-
2010
- 2010-12-10 CN CN 201010582896 patent/CN102107481B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1992016352A2 (en) * | 1991-03-21 | 1992-10-01 | Minnesota Mining And Manufacturing Company | Apparatus and method for constraining a rotating tube of material |
| CN1241476A (en) * | 1999-07-08 | 2000-01-19 | 王峰 | Steel net-reinforced hollow plastic product and its rolling forming process |
| JP2005074957A (en) * | 2003-09-03 | 2005-03-24 | Bridgestone Corp | Die for foam molding, urethane foam and its production method |
| JP2006069159A (en) * | 2004-09-06 | 2006-03-16 | Bridgestone Corp | Foam molding mold and foam molding method |
| CN101344199A (en) * | 2008-08-15 | 2009-01-14 | 付志敏 | Rotational molding plastic composite pipes with steel rings and manufacturing method thereof |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104723586A (en) * | 2013-12-20 | 2015-06-24 | 浙江工商职业技术学院 | Enzyme box production process |
| CN112836251A (en) * | 2021-01-20 | 2021-05-25 | 合兴汽车电子股份有限公司 | Method and system for collecting product shrinkage rate accuracy |
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| Publication number | Publication date |
|---|---|
| CN102107481B (en) | 2013-07-10 |
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Assignee: ANHUI AIDI ENERGY SAVING LIGHT ELECTROMECHANICAL CO.,LTD. Assignor: Liu Jun Contract record no.: 2010340000195 Denomination of invention: Method for controlling dimensional precision of rotational molding formed hollow products License type: Exclusive License Open date: 20110629 Record date: 20101220 |
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Address after: 233200 Chuzhou, Dingyuan province by the opening of the District Jinshan Road, No. 126 Patentee after: ANHUI LEAD ROTATIONAL MOULDING TECH CO.,LTD. Address before: 233200 Chuzhou, Dingyuan province by the opening of the District Jinshan Road, No. 126 Patentee before: ANHUI AIDI ENERGY SAVING LIGHT ELECTROMECHANICAL CO.,LTD. |
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