• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    Injection molding assembly, for manufacturing parts having at least one flat face externally, having injection means (3) provided for injecting a plastic material, a mold for forming a part, having two displaceable parts (1, 2) at least one with respect to the other and facing each other, wherein one of the two parts of the mold has at least one mold cavity for shaping the molded part. The second part of the mold (2) comprises a worm conveyor slidable along a path by means of drive, presenting at least one of its smooth faces acting counter-mold, including pressing means (4) provided for applying a pressure and maintaining a region of the tape facing and in contact with the first part of the mold, such that at least one cavity is in a closed position during a molding condition. (Machine-translation by Google Translate, not legally binding)
    公开号:ES2695756A1
    申请号:ES201730886
    申请日:2017-07-04
    公开日:2019-01-10
    发明作者:Mercader Ramon Jove
    申请人:Quinorgan SL；
    IPC主号:
    专利说明:

    [0001]
    [0002] Injection molding set and manufacturing procedure
    [0003]
    [0004]
    [0005]
    [0006] The object of the present application is the registration of an injection molding assembly as well as a manufacturing process by injection molding a piece of plastic material with a substantially laminar shape.
    [0007]
    [0008] More specifically, the invention proposes the development of an injection molding assembly, for the manufacture of parts that externally have at least one flat face, provided with injection means provided for injecting a plastic material, and a mold for forming a part that It has two displaceable and mutually facing parts, wherein one of the two parts of the mold has a sinfln belt that acts as a counter-mold during the injection or molding stage and means of transportation of the piece or pieces obtained inside the mold.
    [0009]
    [0010]
    [0011]
    [0012] It is well known since many systems and injection machines for the conformation of pieces of various plastic materials. Conventionally, conventional plastic injection machines comprise injection means (nozzle, material supply means, etc.) and a molding region or zone that includes a mold formed by two mutually engageable parts, wherein at least one of the parts includes one or more cavities that have the shape of the molded part to be obtained with the machine. These two parts are usually constituted by two metal bodies that in a closing condition, which takes place during the injection stage, adopt a "box" shape.To facilitate the ejection of the parts inside the mold, ejection equipment is available. , which implies an increase of the complexity in the time of manufacture of the molds as well as an increase of the manufacturing costs.
    [0013]
    [0014] In addition, the applicant is currently not aware of an invention that has all the features described in this specification.
    [0015]
    [0016] The present invention has been developed in order to provide an injection molding assembly that is configured as a novelty within the field of application and solves the aforementioned drawbacks, also providing other additional advantages that will be evident from the description which is followed below.
    [0017]
    [0018] It is therefore an object of the present invention to provide an injection molding assembly, for the manufacture of parts having at least one flat face externally, comprising injection means provided for injecting a plastic material, a mold for forming a piece having two parts movable at least one with respect to the other and facing each other, wherein one of the two parts of the mold has a molding cavity for shaping the molded part, and is characterized in that the second part of the The mold comprises a sinfln belt, made for example of metal material, slidable along a path by means of drive, presenting at least one of its smooth faces acting counter-mold, including pressing means configured to apply a pressure and maintaining a region of the tape facing and in contact with the first part of the mold, such that the cavity is in a closed position hermeticam during a molding condition.
    [0019]
    [0020] Thanks to these characteristics, a system having a lower degree of complexity is obtained, since it allows to simplify the construction of the mold in the manufacture, for example, of laminar pieces in the form of a plate, since it is only necessary to machine a single part of the mold.
    [0021]
    [0022] In a preferred embodiment, the driving means comprise at least one pair of rollers facing each other and spaced apart by a distance between which the belt passes, such that the rollers transmit by contact the movement to the belt, at least one roller being linked to a motor means.
    [0023]
    [0024] In order to facilitate the displacement of the sinfln belt along its path, guiding means arranged along the path that the sinfln belt makes are provided.
    [0025]
    [0026] According to another aspect of the invention, the molding assembly comprises cooling means provided for maintaining (or modifying) at least one region of symphonic tape with a temperature value determined other than the temperature of a region of the tape during the molding step.
    [0027]
    [0028] Furthermore, sliding means linking the movement of the pressing means or first part of the mold with respect to the first part of the mold or pressing means can be provided in the assembly.
    [0029]
    [0030] Additionally, the molding assembly may include ejector means for the parts adhered to the tape, such ejector means being located at a point along the tape beyond the area where the injection means are located. In this way, it is guaranteed that all the pieces that are molded and are initially supported on the belt will not be reintroduced into the molding zone.
    [0031]
    [0032] Preferably, the tape is arranged in a plane longitudinally perpendicular to the horizontal plane, which facilitates the fall of the parts obtained once they have left the molding area, since they can fall by gravity. This aspect avoids the use of complex devices for the ejection of molded parts.
    [0033]
    [0034] Preferably, the sinfm tape used can be made in one piece, so that it facilitates its assembly and / or substitution thereof, thus reducing manufacturing costs.
    [0035]
    [0036] It is also an object of the invention to provide a method of manufacturing by injection molding a piece of plastic material with a substantially laminar shape, from a mold having two complementary parts to each other, in which the plastic material has a temperature of melting in a range comprised between 60-160 ° C, more preferably between 60-100 ° C, wherein in a molding step a flow of molten plastic material is injected into a cavity defined in one of the two parts of the mold that they make up a molding zone. In particular, the method of the invention is characterized in that in the molding step, the molding obtained is adhered to the part of the mold devoid of cavity, said mold part being devoid of cavity a sinfm tape that acts as step by step way
    [0037]
    [0038] Preferably, prior to the molding step, the region of symmetric tape when it is located in the molding zone has a temperature value higher than the temperature of the part of the mold facing the tape. In this way, depending on the plastic material used (resins with a melting temperature in a range between 60-160 ° C, more preferably 60-120 ° C approximately) prevents the formation of defective parts due to poor crystallization of the injected polymer.
    [0039]
    [0040] Likewise, preferably, after the molding step, the region of the sinfln belt provided with the piece obtained undergoes a cooling step to lower the temperature with respect to the temperature of the belt in the molding zone.
    [0041]
    [0042] It is also an additional object of the patent to provide a sheet piece obtained by the manufacturing process described above.
    [0043]
    [0044] This method can be particularly suitable for the manufacture of reinforcement parts for footwear, such as, for example, for the toe and heel area.
    [0045]
    [0046] Other characteristics and advantages of the injection molding assembly object of the present invention will be evident from the description of a preferred embodiment, but not exclusive, which is illustrated by way of non-limiting example in the accompanying drawings, in which :
    [0047]
    [0048]
    [0049]
    [0050] Figure 1.- Is a schematic plan view of an embodiment of an injection molding assembly according to the present invention;
    [0051] Figure 2.- It is a schematic plan view of the assembly represented in the previous figure in a working position or molding condition of a piece or molding;
    [0052] Figure 3.- Is a schematic side elevational view of the molding assembly including an additional view of the pressing means;
    [0053] Figure 4.- Is a schematic isometric view of the molding zone in a stage prior to the molding step;
    [0054] Figure 5.- Is a schematic isometric view of the molding zone in a molding condition; Y
    [0055] Figure 6 .- It is a schematic view of different stages of the process of manufacturing parts according to the present invention where the arrow (f) indicates the direction of advance of the belt symphon.
    [0056]
    [0057] In view of the aforementioned figures and, in accordance with the numeration adopted, one can observe in them an example of a preferred embodiment of the invention, which comprises the parts and elements that are indicated and described in detail below.
    [0058]
    [0059] As shown, the injection molding assembly shown is intended for the manufacture of parts (P) having on the outside at least one flat face, such as plate-like sheet-like pieces.
    [0060]
    [0061] This system comprises means of injection intended to inject a plastic material, a mold to form a part that has two parts (1, 2) displaceable and facing each other, wherein one of the two parts (1) of the mold has a cavity of molding to shape the molded part. These injection means comprise an injector equipment (3) of known type (with a nozzle injector, heating means, linked to a means of supplying plastic material) so that it will not go into greater detail in its description. As shown, in figure 3, the injector equipment includes feeding means that have a dosing hopper (12) that dispenses plastic material in the form of pellets.
    [0062]
    [0063] The second part of the mold (2) consists of a sinfln belt slidable along a path by a driving means, presenting at least one of its smooth faces acting counter-mold, including a pressing means, indicated in a way Referring generally to the reference (4), which are configured to apply a pressure and maintain a region of the tape facing and in contact with the first part of the mold (1), such that the cavity is in a hermetically closed position during a condition of molding The sinfln tape is arranged in a plane longitudinally perpendicular with respect to the horizontal plane.
    [0064]
    [0065] The sinfln tape is made of a metallic material, such as steel, such as, for example, polished stainless steel, able to withstand the pressure produced inside the cavity where the molding of the piece (P) to be obtained takes place, and this avoids the formation of deformations of the piece in the flat area, that is to say, the area of the piece of plastic (P) that is in contact with the tape sinfln.
    [0066] As regards the pressing means (4), they comprise a thrust plate (40) provided with a smooth surface, which moves linearly and perpendicular to the direction of advance of the belt, by means of a system of conventional slide having a plurality of guide bars (41). In Figure 3, an additional representation can be seen where only part of the pressing means (4) has been represented to facilitate its compression. In this way, it can be seen how the thrust plate (40) is mounted on one end of a carriage (42) displaceable axially and horizontally by also using rolling means, such as, for example, rolling elements (43) in the form of rotating wheels that travel along a rail or similar.
    [0067]
    [0068] Both the injection equipment (3) and the pressing means (4) described above are supported on the same common base.
    [0069]
    [0070] Now, with particular reference to the driving means comprise a pair of rollers (6) facing and separated from one another by a distance between which the worm passes, such that the rollers transmit by contact the movement to the worm, at least one of the rollers (6) linked to a motor means, for example, a stepper motor (not shown), as shown in FIGS. 1 to 3. Special mention must be made to the fact that the The movement of the sinfln belt (2) is synchronized with the displacement movement of the first part of the mold (1) as! as also the thrust plate acting on the stretch of the symphonic strip facing the first part of the mold (1).
    [0071]
    [0072] In order to ensure the correct positioning of the sinfln belt, guiding means arranged along the path that the sinfln belt is provided are provided, which have a plurality of rollers (8) and positioners (9) located at both ends of the belt. molding area (indicated in discontinuous lines 100) through which the symphonic tape slides.
    [0073]
    [0074] In order to reach and / or maintain a specific temperature in the region of sinfln tape when it is in contact with the first part of the mold, cooling means are included, such as, for example, heating resistors, a heating system for infrared, or any other heating means known in the art, which has been represented schematically in Figures 1 and 2, with reference 10). In this way, the region of sinfln tape when it is in the molding zone (100), has a temperature value higher than the temperature of the first part of the mold (1) which is facing the sinfm tape. In the same way, in an area remote from the molding zone, cooling means can be provided, indicated in a schematic way with the numerical reference (7), (of known type, such as, for example, an adjustable temperature air-conditioning unit). ), which are intended to lower the temperature of the sinfm tape and thus facilitate the fall of the molded parts adhered.
    [0075]
    [0076] Additionally, the molding assembly includes ejector means for the parts adhered to the tape, said ejector means being located at a point along the tape beyond the zone where the injection means or molding zone are located. . In the realization shown, these ejector means comprise a scraper (11) located at a point of the trajectory of the symmetrical belt, being pivotally movable by means of an axis (13). The presence of this scraper (11) ensures that the tape has no part when it is in contact with the first part of the mold (1) in the molding zone (100).
    [0077]
    [0078] In FIG. 6, the steps of the method using the injection molding assembly described above have been represented schematically, in which the vertical disposition that the symmetrical tape adopts with respect to the floor or horizontal plane, as well as the disposition, can be seen. which adopts, for example, a part (P) once it leaves the molding zone (100).
    [0079]
    [0080] The details, shapes, dimensions and other accessory elements used in the manufacture of the injection molding assembly of the invention could be conveniently replaced by others that do not depart from the scope defined by the claims that are included below.
    权利要求:
    Claims (17)
    [1]
    1. Injection molding assembly, for the manufacture of parts that externally have at least one flat face, comprising injection means (3) intended to inject a plastic material, a mold to form a part, which has two parts ( 1, 2) displaceable at least one with respect to the other and facing each other, wherein one of the two parts of the mold has at least one molding cavity to form the molded part, characterized in that the second part of the mold (2) comprises a sinfln belt slidable along a path by a drive means, having at least one of its smooth faces acting counter-mold, including pressing means (4) configured to apply a pressure and maintain a region of the tape facing and in contact with the first part of the mold, such that at least one cavity is in a hermetically closed position during a molding condition.
    [2]
    2. Injection molding assembly according to claim 1 characterized by the fact that the sinfln tape is made of metal material.
    [3]
    Injection molding assembly according to any one of the preceding claims, characterized in that the driving means comprise a pair of rollers (6) facing each other and separated from one another by a distance between which the endless belt passes, such that the rollers (6) transmit by contact the movement to the belt, being at least one roller (6) linked to a motor means.
    [4]
    4. Injection molding assembly according to any of the preceding claims, characterized in that it includes guiding means arranged along the path that the sinfln belt performs.
    [5]
    Injection molding assembly according to any one of the preceding claims, characterized in that it comprises cooling means (7, 10) provided to maintain at least one region of synfln belt with a predetermined temperature value.
    [6]
    Injection molding assembly according to any one of the preceding claims, characterized in that sliding means are provided that link the displacement of the pressing means (4) or first part of the mold with respect to the first part of the mold (1) or pressing means.
    [7]
    Injection molding assembly according to any of the preceding claims, characterized in that the pressing means (4) includes a thrust plate (40) mounted on a carriage (42) axially displaceable by displacement means.
    [8]
    Injection molding assembly according to claim 7, characterized in that the displacement means comprise rolling elements (43).
    [9]
    Injection molding assembly according to any of the preceding claims, characterized in that it includes ejector means for the parts adhered to the belt, said ejector means being located at a point along the belt beyond the belt. of the area where the injection means and / or molding zone are located.
    [10]
    10. An injection molding assembly according to claim 9, characterized in that the ejector means comprises a scraper (11) located at a point in the path of the belt.
    [11]
    Injection molding assembly according to any one of the preceding claims, characterized in that the wrist strap is arranged in a plane longitudinally perpendicular to the horizontal plane.
    [12]
    Injection molding assembly according to any one of the preceding claims, characterized in that the symphonic tape is made in one piece.
    [13]
    13. Manufacturing process by injection molding a piece of plastic material with a substantially laminar shape, from a mold that has two parts complementary to each other, in which the plastic material has a melting temperature in a range comprised between 60-160 ° C, wherein in a molding step a flow of molten plastic material is injected into a cavity defined in one of the two parts of the mold that make up a molding zone, characterized in that in the step of molding, the obtained molded piece remains adhered in the part of the mold devoid of cavity, said mold part being devoid of a cavity, a sinfln belt acting step by step.
    [14]
    14. Method according to claim 13, characterized in that before the molding step, the region of sinfln tape when it is in the molding zone has a temperature value higher than the temperature of the part of the mold that is facing to the sinfln tape.
    [15]
    15. Method according to any of claims 13 and 14, characterized in that after the molding step, the region of sinfln provided with the piece obtained undergoes a cooling step to lower the temperature with respect to the temperature of the tape in the molding area.
    [16]
    16. Method according to claim 13, characterized in that the plastic material has a melting temperature in a range between about 60-120 ° C.
    [17]
    17. A sheet piece obtained by the manufacturing process according to any of claims 13 to 16.
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    同族专利:
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    法律状态:
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    优先权:
    申请号 | 申请日 | 专利标题
    ES201730886A|ES2695756B2|2017-07-04|2017-07-04|MOLDING ASSEMBLY BY INJECTION AND MANUFACTURING PROCEDURE|ES201730886A| ES2695756B2|2017-07-04|2017-07-04|MOLDING ASSEMBLY BY INJECTION AND MANUFACTURING PROCEDURE|
    EP18759992.3A| EP3650194A1|2017-07-04|2018-05-23|Injection moulding assembly and manufacturing method|
    CN201880044793.3A| CN110958936A|2017-07-04|2018-05-23|Injection molded component and method of manufacture|
    PCT/ES2018/070371| WO2019008199A1|2017-07-04|2018-05-23|Injection moulding assembly and manufacturing method|
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