阅读说明：本技术 一种新型滚塑成型工艺 (Novel rotational molding process ) 是由 程云模 于 2019-11-08 设计创作，主要内容包括：本发明涉及一种新型滚塑成型工艺,其特征在于,通过滚塑工艺在滚塑制品内部植入滚塑强化功能体,基于所述滚塑强化功能体,以使所述滚塑制品具有较高的整体强度,或者实现内部分腔及隔断功能。本发明的一种新型滚塑成型工艺,通过该新型滚塑成型工艺能够在形成滚塑产品壁的同时,在其内腔成型滚塑强化功能体。所述滚塑强化功能体与滚塑制品一次同步成型,省时省力,高效便捷。具有该滚塑强化功能体的滚塑制品,其抵抗变形的性能优异,具有非常好的强度,并且根据实际需求,还可以进一步实现产品内部的区域隔断或分腔功能。(The invention relates to a novel rotational molding process which is characterized in that a rotational molding strengthening functional body is implanted into a rotational molding product through a rotational molding process, and based on the rotational molding strengthening functional body, the rotational molding product has higher integral strength or the functions of internal cavities and partitions are realized. According to the novel rotational molding process, the rotational molding strengthening functional body can be molded in the inner cavity of the rotational molding product wall while the rotational molding product wall is formed. The rotational molding strengthening functional body and the rotational molding product are molded synchronously at one time, so that the rotational molding strengthening functional body is time-saving, labor-saving, efficient and convenient. The rotational molding product with the rotational molding strengthening functional body has excellent deformation resistance and very good strength, and can further realize the function of regional partition or cavity division inside the product according to actual requirements.)

1. A novel rotational molding process is characterized in that,

the rotational molding strengthening functional body is implanted into the rotational molding product through a rotational molding process, so that the rotational molding product has higher overall strength or the functions of internal cavities and partition are realized based on the rotational molding strengthening functional body.

2. A novel rotomoulding process as claimed in claim 1,

the rotational molding strengthening functional body is formed by rotational molding through a support base body, and the support base body is preassembled on a rotational molding die.

3. A novel rotomoulding process as claimed in claim 1,

the supporting base adopts a single structure or a connecting structure;

the single structure is a bar, a rod, a column;

the connection structure is a frame body formed by connecting single structural bodies, and all the single structural bodies forming the frame body are connected in a splicing welding or bundling mode.

4. The process for molding a rotomolded reinforced article of claim 1,

one of the connection structures between the support base and the mold is: a threaded hole is preset in the root base part of one end of the support base body, a bolt hole is formed in the preset position of the mold, and a bolt penetrates through the bolt hole in the mold from outside to inside and is then in threaded connection with the threaded hole in the root base part of the support base body.

5. The process for molding a rotomolded reinforced article of claim 1,

a second connecting structure between the support substrate and the mold: and welding a nut on the base part at one end of the support base body, forming a bolt hole at the preset position of the die, and enabling the bolt to penetrate through the bolt hole on the die from outside to inside and then to be in threaded connection with the nut on the base part of the support base body.

6. The process for molding a rotomolded reinforced article of claim 1,

a third connecting structure between the supporting base body and the mold: welding a nonmagnetic plate on the die, wherein the nonmagnetic plate is provided with a hole and is welded with the metal shaft, the head of the metal shaft is fixed with a high-temperature resistant magnet, and the rod part of the metal shaft is in interference fit with a nonmagnetic metal rod; the welding of the root base portion of supporting base member one end has a magnetic substance, the magnetic substance have with nonmagnetic metal bar complex direction slotted hole, when the supporting base member that has the magnetic substance is close to with the metal axle that has high temperature resistant magnet, borrow the guide effect by magnetism actuation and nonmagnetic metal bar, can be natural smooth and easy will support the base member and adsorb on the mould.

7. The process for molding a rotomolded reinforced article of claim 4 or 5,

a certain distance is reserved between the end surfaces of the root base parts at the two ends of the supporting base body and the outer wall of the rotational molding product, namely, the end surface of the root base part and the inner wall of the mold are reserved at the end connected with the mold through a bolt fixing part, and the end surface of the root base part at the other end is also reserved with the inner wall of the mold at the preset distance.

8. The process for molding a rotomolded reinforced article of claim 1,

when the supporting base body is made of metal materials, before the supporting base body is installed on a mold, a plastic coating layer is coated on the surface of the supporting base body in advance, and then the supporting base body is installed on the mold.

9. The process for molding a rotomolded reinforced article of claim 1,

when the supporting base body adopts the structures such as strips, rods, columns and the like which only play a role in supporting and strengthening, the mold cavities are communicated with each other, and one-time feeding is selected.

10. The process for molding a rotomolded reinforced article of claim 1,

when the supporting base body adopts a plate-shaped structure which not only can play a role in supporting and strengthening, but also can realize the whole-plate design of separating sub-bins, the adding amount of the materials is calculated according to the size of each sub-bin before the materials are fed, and the materials are distributed and fed to each sub-bin;

when the support base body adopts a plate-shaped structure which not only can play a role in supporting and strengthening, but also can realize the hollow design of separating the sub-bins, the material is selected to be fed once or distributed according to the actual condition.

11. A process for forming a rotomoulded reinforced article as claimed in claim 4 or claim 5, including the steps of:

s1, pre-installing the support base body at a preset position of the rotational molding die through a bolt fixing piece;

s2, feeding materials into the die;

s3, closing the die, heating and simultaneously starting the rotation of the die to enable the raw materials inside to be melted and adhered to the inner wall of the die uniformly, and meanwhile, combining the supporting substrate and the wall of the rotational molding product into a whole;

s4, after heating and before air cooling demoulding, detaching the support base from the rotational moulding mould, and at the moment, only taking down the fixing bolt from the outside of the mould;

s5, opening the mould, and demoulding to obtain a rotational moulding product with a rotational moulding strengthening functional body inside;

and S6, sealing the hole positions on the surface of the rotational molding product by welding.

12. The process for molding a rotomolded reinforced article of claim 6, comprising the steps of:

s1, fixing the support matrix at a preset position of the rotational molding die through high-temperature resistant magnet adsorption;

s2, feeding materials into the die;

s3, closing the die, heating and simultaneously starting the rotation of the die to enable the raw materials inside to be melted and adhered to the inner wall of the die uniformly, and meanwhile, combining the supporting substrate and the wall of the rotational molding product into a whole;

s4, demoulding after air cooling, and directly taking a piece to obtain a rotational molding product with a rotational molding strengthening functional body inside;

and S5, sealing the hole reserved on the surface of the rotational molding product by welding.

Technical Field

The invention relates to a rotational molding process, in particular to a novel rotational molding forming process.

Background

The rotational moulding process is a thermoplastic hollow moulding process, and its basic moulding principle is that resin powder raw material is firstly added into mould, then the mould is heated and continuously rotated, the resin raw material in the mould is gradually and uniformly coated and melt-adhered on the whole inner surface of the mould under the action of gravity and heat, and formed into required shape, and finally the final rotational moulding product is formed through a series of procedures of cooling, demoulding and forming, etc.

In the plastic mould processing technology, the rotational moulding forming technology is always an important position. Compared with the traditional plastic mould processing technologies such as injection, blow molding, extrusion molding and the like, the rotational molding technology has the advantages that: 1. the rotational molding die has low manufacturing cost; 2. the edge and the external corner of the rotational molding product have good strength; 3. the shape of the rotational moulding product can be very complex, and the thickness can exceed more than 5 millimeters; 4. the rotational molding process can produce fully-closed products, and is particularly suitable for forming seamless large hollow plastic products.

However, due to the specific forming principle of the rotational molding process, one obvious defect is that the product can only be used for preparing hollow or shell products. Because the rotational molding product is of a double-layer hollow structure, plastic is used as rotational molding raw material, and the size thickness and the limitation of the traditional rotational molding process are added, the strength of partial products is insufficient, the deformation resistance is poor, and the use requirement cannot be met.

In order to solve the problems of insufficient strength and poor deformation resistance of rotational molding products, the following three types of traditional improvement measures are mainly adopted.

One is as follows: and cutting the double-layer rotational molding product from the middle, dividing the double-layer rotational molding product into two single layers, manually welding a plastic rib plate on one layer, and welding the plastic rib plate with the other layer after welding. The mode of manually welding the plastic rib plates is adopted, the welding line strength is poor, the production efficiency is particularly low, the product reliability is poor, the plastic rib plates are not connected with one layer, the effect of improving the product strength is limited, most importantly, the original one-step forming surface is damaged, and the significance of rotational molding production is lost.

The second step is as follows: the product is additionally provided with the adhesion points to adhere the double layers of the product together, and the mode is mainly used for improving the local deformation of the product, and the effect of improving the strength of the product is general because the product is only in local point contact.

And thirdly: part of products improve the product strength by increasing the wall thickness of the products or using modified materials, and the effect is general and the production cost is greatly increased.

Disclosure of Invention

The invention aims to solve the problem of insufficient strength of a rotational molding product, and further provides a novel rotational molding process, which can form a rotational molding strengthening functional body in an inner cavity of the rotational molding product while forming the wall of the rotational molding product. The rotational molding strengthening functional body and the rotational molding product are molded synchronously at one time, so that the rotational molding strengthening functional body is time-saving, labor-saving, efficient and convenient. The rotational molding product with the rotational molding strengthening functional body has excellent deformation resistance and very good strength, and can further realize the function of regional partition or cavity division inside the product according to actual requirements.

In order to solve the problems, the technical scheme adopted by the invention is as follows:

a novel rotational molding process is characterized in that:

the rotational molding strengthening functional body is implanted into the rotational molding product through a rotational molding process, so that the rotational molding product has high overall strength and internal cavity and partition functions are realized based on the rotational molding strengthening functional body.

The rotational molding strengthening functional body is formed by rotational molding through a support base body, and the support base body is preassembled on a rotational molding die.

The supporting base adopts a single structure or a connecting structure; the single structure is a structural body such as a strip, a rod, a column and the like; the connection structure is a frame body formed by connecting and combining single structural bodies such as bars, rods, columns and the like, and all the single structural bodies forming the frame body are connected in a splicing welding or bundling mode;

the supporting base body is fixedly connected to the inner wall of the cavity of the mold through a bolt connecting piece;

one of the connection structures between the support base and the mold is: a threaded hole is preset in the root base part at one end of the support base body, a bolt hole is formed in the preset position of the mold, and a bolt penetrates through the bolt hole in the mold from outside to inside and is then in threaded connection with the threaded hole in the root base part of the support base body;

a second connecting structure between the support substrate and the mold: welding a nut on the root base part at one end of the support base body, forming a bolt hole at a preset position of the die, enabling the bolt to penetrate through the bolt hole on the die from outside to inside, and then connecting the bolt with the nut on the root base part of the support base body in a threaded manner;

further, any connecting structure between the supporting base body and the mould is adopted, and the following requirements are met: a certain distance is reserved between the end surfaces of the root bases at the two ends of the supporting base body and the outer wall of the rotational molding product, namely, the end surface of the root base at one end connected with the mold is reserved with the preset distance from the inner wall of the mold through a bolt fixing piece, and the end surface of the root base at the other end is also reserved with the preset distance from the inner wall of the mold; this interval can be on the one hand with the root base portion of supporting the base member wrap up in rotational moulding goods inside completely, has ensured the connection tightness between the two on the other hand, and practice verifies, the interval should be less than 1.5 times product wall thickness.

The supporting base body is fixed on the inner wall of the cavity of the mold in an attracting way through a high-temperature resistant magnet;

the concrete structure design is as follows: welding a nonmagnetic plate on the die, wherein the nonmagnetic plate is provided with a hole and is welded with the metal shaft, the end part of the metal shaft is fixed with a high-temperature resistant magnet, and the tail part of the metal shaft is in interference fit with a nonmagnetic metal rod; the welding of the root base portion of supporting base member one end has a magnetic substance, the magnetic substance have with no magnetism metal bar complex direction slotted hole, when the supporting base member that has the magnetic substance is close to with the metal axle that has high temperature resistant magnet, borrow the guide effect of the no magnetism metal bar by magnetism actuation and metal axle afterbody, can be natural smooth and easy will support the base member and adsorb on the mould.

When the supporting base body is made of metal materials, before the supporting base body is installed on a die, a plastic coating layer is coated on the surface of the supporting base body in advance, and then the supporting base body is installed on the die.

When the supporting base body adopts the structures such as bars, rods, columns and the like which only play a role in supporting and strengthening, the mold cavities are communicated with each other, so that one-time feeding can be selected;

when the supporting base body adopts a plate-shaped structure which not only can play a role in supporting and strengthening, but also can realize the whole-plate design of separating sub-bins, the adding amount of the materials is calculated according to the size of each sub-bin before the materials are fed, and the materials are distributed and fed to each sub-bin;

when the support base body adopts a plate-shaped structure which not only can play a role in supporting and strengthening, but also can realize the hollow design of separating the sub-bins, the material can be fed once or distributed according to actual conditions.

The molding process of the rotational molding reinforced product realized by adopting a bolt fixing mode comprises the following steps:

s1, pre-installing the support base body at a preset position of the rotational molding die through a bolt fixing piece;

s2, feeding materials into the die;

s3, closing the die, heating and simultaneously starting the rotation of the die to enable the raw materials inside to be melted and adhered to the inner wall of the die uniformly, and meanwhile, combining the supporting substrate and the wall of the rotational molding product into a whole;

s4, after heating and before air cooling demoulding, detaching the support base from the rotational moulding mould, and at the moment, only taking down the fixing bolt from the outside of the mould;

s5, opening the mould, and demoulding to obtain a rotational moulding product with a rotational moulding strengthening functional body inside;

and S6, sealing the hole positions on the surface of the rotational molding product by welding.

The molding process of the rotational molding reinforced product realized by adopting the high-temperature resistant magnet adsorption fixing mode comprises the following steps:

s1, fixing the support matrix at a preset position of the rotational molding die through high-temperature resistant magnet adsorption;

s2, feeding materials into the die;

s3, closing the die, heating and simultaneously starting the rotation of the die to enable the raw materials inside to be melted and adhered to the inner wall of the die uniformly, and meanwhile, combining the supporting substrate and the wall of the rotational molding product into a whole;

s4, demoulding after air cooling, and directly taking a piece to obtain a rotational molding product with a rotational molding strengthening functional body inside;

and S5, sealing the hole positions on the surface of the rotational molding product by welding.

The rotational molding strengthening functional body is synchronously molded with the product wall of the rotational molding product at one time through the rotational molding process, so that the problem of insufficient strength of the rotational molding product can be solved, and the functions of local sealing, bin and cavity separation and partition addition of the product can be realized. More importantly, the deformation resistance of the product is improved, and other properties of the product are not damaged or influenced. The support matrix made of rigid materials is embedded into the rotational molding product through the rotational molding process, the one-step rotational molding forming process is adopted, the process is efficient and reliable, the excellent performance of the rigid materials is integrated into the rotational molding materials, the defect that the tensile strength and the compressive strength of plastics are insufficient is effectively overcome, the strength and the reliability of the product are greatly improved, the application field and the scene range of the rotational molding product are widened, and the rotational molding product has wide practicability.

Drawings

FIG. 1: a schematic structural diagram of the front side of the support base body;

FIG. 2: the left side view of FIG. 1;

FIG. 3: a schematic view of a support substrate and mold mounting structure;

FIG. 4: a second schematic view of a supporting substrate and a mold mounting structure;

FIG. 5: a third schematic view of a supporting substrate and a mold mounting structure;

in the figure, 1, a support base body, 10, a main body part, 11, a root base part, 11a, an end face, 2, a rotational molding body, 30, a product wall, 31, a hollow cavity, 4, a nonmagnetic plate, 41, an upper die, 42, a lower die, 5, a fixing bolt, 51, a nonmagnetic metal rod, 52, a metal shaft, 6, a fixing nut, 7, a nut, 71, a magnetic body, 8, a high-temperature resistant magnet, 9 and a threaded hole.

Detailed Description

The present invention will be described in detail below with reference to the accompanying drawings.