WO2018100021A1 - Procédé de fabrication d'un élément électrique ou mécanique - Google Patents

Procédé de fabrication d'un élément électrique ou mécanique Download PDF

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Publication number
WO2018100021A1
WO2018100021A1 PCT/EP2017/080899 EP2017080899W WO2018100021A1 WO 2018100021 A1 WO2018100021 A1 WO 2018100021A1 EP 2017080899 W EP2017080899 W EP 2017080899W WO 2018100021 A1 WO2018100021 A1 WO 2018100021A1
Authority
WO
WIPO (PCT)
Prior art keywords
plastic layer
component
heating element
encapsulation
pocket
Prior art date
Application number
PCT/EP2017/080899
Other languages
German (de)
English (en)
Inventor
David Ayza Parra
Original Assignee
Robert Bosch Gmbh
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Robert Bosch Gmbh filed Critical Robert Bosch Gmbh
Publication of WO2018100021A1 publication Critical patent/WO2018100021A1/fr

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/16—Making multilayered or multicoloured articles
    • B29C45/1671—Making multilayered or multicoloured articles with an insert
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/0081—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor of objects with parts connected by a thin section, e.g. hinge, tear line
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/14—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles
    • B29C45/14065—Positioning or centering articles in the mould
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B3/00—Ohmic-resistance heating
    • H05B3/40—Heating elements having the shape of rods or tubes
    • H05B3/42—Heating elements having the shape of rods or tubes non-flexible
    • H05B3/48—Heating elements having the shape of rods or tubes non-flexible heating conductor embedded in insulating material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D35/00—Filtering devices having features not specifically covered by groups B01D24/00 - B01D33/00, or for applications not specifically covered by groups B01D24/00 - B01D33/00; Auxiliary devices for filtration; Filter housing constructions
    • B01D35/18—Heating or cooling the filters
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/16—Making multilayered or multicoloured articles
    • B29C2045/1693—Making multilayered or multicoloured articles shaping the first molding material before injecting the second molding material, e.g. by cutting, folding
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/14—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles
    • B29C45/14639—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles for obtaining an insulating effect, e.g. for electrical components
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/14—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles
    • B29C45/14819—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles the inserts being completely encapsulated
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/17—Component parts, details or accessories; Auxiliary operations
    • B29C45/26—Moulds
    • B29C45/2628—Moulds with mould parts forming holes in or through the moulded article, e.g. for bearing cages
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2031/00—Other particular articles
    • B29L2031/779—Heating equipment
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B2203/00—Aspects relating to Ohmic resistive heating covered by group H05B3/00
    • H05B2203/017—Manufacturing methods or apparatus for heaters

Definitions

  • the present invention relates to a method for producing a
  • the heater is usable in a fuel filter.
  • Liquids are filterable. Such filter devices often have a heater to prevent freezing of the filter medium.
  • filter devices are known from the publications DE 10 2006 034 077 A1 and DE 10 2007 005 771 A1.
  • heaters or other electrical or mechanical elements such as e.g. Sensors, reinforcements or similar elements used in liquid filters, it must be ensured that the liquid to be filtered with
  • the heating or the electrical or mechanical element must be held by auxiliary elements.
  • Auxiliary elements prevent full encapsulation of the heater or the electrical or mechanical element, so that subsequent steps are necessary to achieve a complete and thus in particular fluid-tight surrounding the heater or the electrical or mechanical element with plastic.
  • the inventive method allows a fluid-tight encapsulation of components, in particular heating elements, with a plastic.
  • the component, in particular the heating element which is preferably made of a metallic material, does not come into contact with liquids.
  • the component, in particular the heating element which is preferably made of a metallic material, does not come into contact with liquids.
  • the component, in particular the heating element which is preferably made of a metallic material
  • Heating element a sensor or a reinforcing element, in one
  • Liquid filter used so that the liquid to be filtered by the liquid filter can not come into contact with the component, in particular the heating element. Thus, corrosion of the component, in particular of the
  • the method allows a simple and inexpensive overmolding, wherein the component, in particular the heating element, is securely and reliably encapsulated by a plastic.
  • the method also allows the overmolding of a pliable component with a plastic. Under limb components is particularly understood that such components considerably deformed by the pure injection pressure of in particular between 400 bar and 1500 bar, preferably between 500 bar and 1000 bar, the spray jet or non-uniform flow fronts on the two sides of the insert or the component can be.
  • the inventive method also ensures that the plastic extrusion has uniform wall thicknesses.
  • the method for producing an electrical or mechanical element comprises the following steps: First, a first encapsulation of a component with a first plastic layer takes place.
  • the component is preferably made of a metallic material and can advantageously be heated, in particular by an electric current, or generate and / or conduct electrical signals in the manner of a sensor. After the at least one first encapsulation takes place a second encapsulation of the one with the first
  • Plastic layer overmolded component with a second plastic layer
  • a pocket is formed which, for the second encapsulation, is overmolded with the first plastic layer
  • Component serves. Under bag is to understand a basically concave area.
  • the pocket has a recess into which a holding element can be inserted. This means that holding elements can be used to hold the component in the pocket, in order subsequently to enable a second encapsulation of the component.
  • the at least one pocket is thus attached to the component by the first encapsulation, in that the pocket is a part of the first plastic layer.
  • An internal volume of the pocket is, advantageously completely, separated from the component.
  • Plastic layer overmolded component lie within the bag open, that is: be accessible bare without plastic layer within the bag.
  • the pocket By forming the pocket there is a fixation of the electrical or mechanical element for the second encapsulation. It is provided that the at least one first encapsulation mainly for
  • the device which have a very low bending stiffness, which is also referred to below as limp, safely and reliably encapsulate with a plastic. Under a very small
  • Flexural rigidity is to be understood in particular that a deformation by
  • the component of the element is formed as a stamped grid, particularly advantageously made of a metal sheet.
  • the element is preferably a heater, so that the heating is particularly advantageously designed as a stamped grid heater.
  • the component is preferably a heating element, wherein the heating element is particularly is preferably formed as a stamped grid, in particular of a metal sheet.
  • Injection mold is pressed by the injection pressure against the wall of the injection mold.
  • no plastic can be provided between the injection mold and the component, whereby a complete environment of the component is prevented by plastic. This is done by splitting the
  • the component is reinforced by the first encapsulation, in which case it is not a mandatory requirement that the component is completely surrounded by the first plastic layer after the first encapsulation. Rather, the now reinforced component by a second step of
  • Envelope be surrounded by the second plastic layer, wherein the first plastic layer additionally provides the pockets for mounting.
  • a holding element does not have to directly hold the component, which in turn would lead to an opening in the overmolded plastic after the extrusion coating process and the removal of the holding element.
  • the element is preferably a heater of a liquid filter.
  • the component is preferably a heating element.
  • a heater can be produced in a particularly simple, low-effort, fluid-tight and cost-effective manner.
  • the heating element can be heated so as to deliver a heat output to the liquid filter. In this way, a freezing of fluid within the
  • Liquid filter prevented or a frozen fluid defrostable Due to the plastic extrusion coating, the heater is optimally suited for use in a liquid filter, since the plastic coating shields the heating element from the fluid. Thus, even highly corrosive fluids, such as urea solutions, can not lead to corrosion of the heater, particularly the heater
  • the element is advantageously designed in the form of a sleeve. This means that the element has a hollow cylindrical shape, which in particular makes it possible to arrange a filter medium inside the element, which is preferred when the element is a heater.
  • Element in particular the heater, thus can enclose the filter element in a ring in a liquid filter, so as to heat the filter element and a liquid present therein.
  • a shape of a cuff poses a great challenge during the overmolding because deformations of the component must be prevented. Otherwise, this would mean that the component is not completely surrounded by plastic and therefore can come into contact with the liquid to be filtered. In this case, the risk of corrosion would exist. Since such deformation is prevented by the at least one first encapsulation and by the second encapsulation of the component of the element, the sleeve shape represents a preferred form of the element, in particular the heater, since this optimally with the
  • Filter medium can be combined.
  • the method can also be used for mechanical or electrical elements that are not used in a liquid filter.
  • Enveloping is transformed by forming out of a flat basic shape out.
  • the forming is advantageously done by at least partially reversible elastic deformation.
  • the component e.g. a stamped grid
  • the component in the deformed state have a certain tendency to deform at least partially back towards the starting position.
  • the component is produced from a plate-shaped material.
  • the component is produced from a sheet by punching.
  • the component thus has a dimension in a spatial dimension which is considerably smaller than dimensions in the other two dimensions of space. Therefore, the component is plate-shaped. Before the first encapsulation, the component is formed out of this plate shape.
  • the forming can in particular a bending of the component in a
  • the component of the deformed shape at least a bit far push back to the original shape.
  • These restoring forces can be handled easily by means of the method according to the invention, since a comprehensive fixation of the component can take place during the first extrusion coating.
  • the at least one pocket represents the only fixation of the component during the second encapsulation.
  • the pocket has a cylindrical inner volume into which holding elements in the form of cylindrical pins can engage. Since the bag is formed exclusively by the first plastic layer, thus a full encapsulation of the component is possible because the component in any
  • the component is preferably held over the pocket in such a way that a seam lies between the first plastic layer and the second plastic layer within the pocket.
  • the seam lies exclusively within the second pocket.
  • Plastic layer is increased.
  • Plastic layer can be formed.
  • Such a seam may result in penetration of fluid between the first plastic layer and the second plastic layer. This is possible avoid in particular such an element according to the invention that for complete sealing of the seam only the bag must be closed. Outside the bag, only the second plastic layer is present.
  • the bag can be closed by simply welding, in particular the fact that the bag as a suspension point of the
  • the element can be welded to other components, in particular to a housing of a liquid filter, wherein an opening of the pocket is sealed.
  • the inner volume of the bag is sealed from the environment, whereby penetration of fluid into the pocket and thus in the seam between the first plastic layer and second plastic layer is prevented.
  • sealing of the element is made simple and low in effort.
  • the seam can be made e.g. sealed fluid-tight by a welding process in a particularly simple and low-effort.
  • Particularly advantageous is the component through the second plastic layer, with
  • the component is preferably held by a plurality of fixing elements.
  • the fixing elements hold the component in a predefined position.
  • the use of the fixing elements leads to a non-fluid-tight encapsulation of the component during the first
  • Insert molding does not adversely affect, since such, in particular fluid-tight encapsulation, takes place by the second encapsulation.
  • the component can be safely and reliably held in the predefined position, so as to ensure that the element produced has a desired contour.
  • a plurality of fixing elements is understood in particular to mean that at least two fixing elements are used.
  • the predefined kinks serve to deform the element by kinking or folding after the first encapsulation.
  • the kinks are in particular a film hinge or a film hinge. This means that the kinks correspond in particular to those places where a
  • Material thickness of the first plastic layer is reduced locally. This results in the application of a bending load on the component to a deformation of the plastic layer takes place at the kinks. In this way, in particular a predefined shape of the element can be achieved in that a plate-shaped component by the first encapsulation such a first
  • Plastic layer having a corresponding by kinking
  • predefined deformation can be achieved exactly in this way. In particular, can be through the
  • the first plastic layer has at least one holding element.
  • the holding element can enable a latching with a partial area of the first plastic layer.
  • the component is stable after deforming in a deformed position. Thus, it is dispensed with that a large number of additional components must be provided, which hold the component in a predefined position. If the component, as described above, made of a plate-shaped material and is to be brought by elastic deformation in a final shape, this is by the above-described kinks and by the
  • the first plastic layer and the second Kunststoffschi cht are preferably made of the same material. Thus, it is particularly avoided that thermal stresses can occur within the element. At the same time, the manufacture of the element is simplified. As a result, the thermal expansion coefficients of the two plastic layers are particularly advantageously the same, so that the risk of stress cracking is low. Furthermore, this is advantageous the same shrinkage behavior after the
  • Plastic layers is minimized.
  • a first material of the first encapsulation differs from a second material of the second encapsulation.
  • the second plastic layer surrounds the first plastic layer and the component.
  • the second plastic layer surrounds the first plastic layer and the component completely. This means that a user can only see the second plastic layer when looking outside the mechanical or electrical element. Thus, a bore that would be introduced from outside into the element, first the second plastic layer and then the first plastic layer and the component or without the first plastic layer directly hit the component.
  • the inner volume of the bag is not considered
  • the component has at least one electrical contacting point.
  • no first plastic layer and no second plastic layer are applied.
  • a contact pocket is formed from the first plastic layer and / or the second plastic layer, within which the contacting point is arranged. It is thus provided in particular that an electrical connection to the component, in particular the heating element, is made possible. This is known from the prior art. Since the contact pocket preferably lies outside of regions of a liquid filter which can come into contact with the fluid to be filtered, such a partial non-extrusion coating of the at least one electrical
  • the invention also relates to a heating of a liquid filter.
  • the heater comprises a heating element, a first plastic layer and a second plastic layer. It is provided that the first plastic layer surrounds the heating element and the second plastic layer surrounds the first plastic layer and the heating element. The second plastic layer ensures a fluid-tight surrounding of the heating element.
  • Plastic layer is formed at least one pocket, wherein a seam between the first plastic layer and the second plastic layer is disposed within the pocket.
  • the pocket may be additionally enlarged by the second plastic layer.
  • the invention relates to a fluid filter having a housing with an inlet and an outlet.
  • the liquid filter has a, in particular hohizylinderformiges, filter medium and a heater.
  • Filter medium and the heater are disposed within the housing.
  • the heating is a heating as described above. This ensures that the heating element of the heater can not get in contact with liquids inside the liquid filter. As a result, the heating element is protected against corrosion. Nevertheless, the heater allows safe and reliable, the liquid filter, in particular the filter medium to protect against freezing of the liquid contained. Particularly advantageous surrounding the heater, the filter medium to annularly.
  • Figure 1 is a schematic view of a heater according to a
  • Embodiment of the invention wherein the individual layers of the heater are shown broken, 2 a schematic representation of a heating element as used in the heating according to the exemplary embodiment, a schematic plan view of the heating according to the exemplary embodiment of the invention, a schematic sectional view according to the section line AA shown in FIG. 3, a schematic detail view of that in FIG. 4
  • FIG. B a schematic view of fluid flows within the area B shown in Figure 4, before sealing the pockets, a schematic representation of fluid flows within the area B shown in Figure 4, after sealing the pockets, a schematic representation of a heating element of a heater according to an alternative embodiment of the invention, a schematic representation of the heating element of the heater according to the alternative embodiment of the invention after a first encapsulation, a schematic plan view of the heating element of the heater according to the alternative embodiment of the invention after the first encapsulation and after deformation, a schematic isometric view of the heating element of the heater according to the alternative embodiment of the invention after the first encapsulation and after the
  • Figure 12 is a schematic view of a liquid filter according to the
  • the production of a heater for a liquid filter is described below.
  • the heating element provides the above
  • the heater 1 shows schematically a heater 1.
  • the heater 1 can be used in particular in a liquid filter 12 (see FIG. In Figure 1, the heater 1 is shown with multiple outbreaks, so that all the components of the heater 1 can be seen. It is understood that the heater 1 is just one example of an embodiment of the invention.
  • the proposed method can also be applied to electrical components, e.g. for installation in liquid filters, e.g. for sensors. It is also conceivable to provide the method for the encapsulation of mechanical elements which are to be encapsulated in a fluid-tight manner.
  • the heater 1 comprises a heating element 2.
  • the heating element 2 is shown in FIG.
  • the heating element 2 is a stamped grid element which is punched out of a metal sheet. It is a thickness of the
  • the heating element 2 is a pliable element which has only a low rigidity.
  • the heating element 2 comprises a multiplicity of heating coils, wherein an electrical voltage can be applied to the heating element 2 via contacting points 10, so that an electric current resulting therefrom can be applied
  • Heating element 2 can heat up.
  • the heating element 2 is encapsulated in plastic.
  • the injection pressure may for example be between 400 bar and 1500 bar, preferably between 500 bar and 1000 bar. This is done in two steps, so that the heater 1, as shown in Figure 1, a first Plastic layer 3 and a second plastic layer 4 has.
  • the first plastic layer 3 and the second plastic layer 4 are advantageously formed from the same plastic.
  • Plastic layer 3 and the second plastic layer 4 ensures that no fluid can reach the heating element 2.
  • FIG. 1 schematically shows a fixing element 7.
  • the fixing element 7 is used to hold the heating element 2 during the first encapsulation to form the first plastic layer 3.
  • FIG. 1 schematically shows a fixing element 7.
  • the fixing element 7 is used to hold the heating element 2 during the first encapsulation to form the first plastic layer 3.
  • FIG. 1 schematically shows a fixing element 7.
  • the fixing element 7 is used to hold the heating element 2 during the first encapsulation to form the first plastic layer 3.
  • FIG. 1 schematically shows a fixing element 7.
  • the fixing element 7 is used to hold the heating element 2 during the first encapsulation to form the first plastic layer 3.
  • FIG. 1 schematically shows a fixing element 7.
  • the fixing element 7 is used to hold the heating element 2 during the first encapsulation to form the first plastic layer 3.
  • FIG. 1 schematically shows a fixing element 7.
  • Fixing 7 required to prevent deformation of the heating element 2 during the first encapsulation. Such deformation would otherwise take place due to the injection pressure.
  • Heating element 2 the wall thickness of the first plastic layer 3 fluctuate.
  • the heating element 2 by the injection pressure, the heating element 2 to a wall of a
  • Injection molding tool is pressed, whereby a complete encapsulation with the first plastic layer 3 is no longer possible because no plastic between the heating element 2 and the wall of the injection mold can penetrate.
  • the first plastic layer 3 is therefore not used for fluid-tight encapsulation of the heating element 2. Rather, the heating element 2 by the first
  • Plastic layer 3 structurally reinforced, so that a simple and low-cost further processing of the heating element 2 with the first plastic layer 3 is made possible.
  • the heating element 2 with the first plastic layer 3 is then encapsulated by a second encapsulation process with a second plastic layer 4.
  • the second plastic layer 4 is preferably made of same material as the first plastic layer 3.
  • Plastic layer 4 surrounds the heating element 2 in a fluid-tight manner. Thus, penetration of fluid into the heater 1 is prevented, so that the heating element 2 is protected from corrosion.
  • the fluid-tight encapsulation of the heating element 2 with the first plastic layer 3 by the second encapsulation is achieved in particular by the fact that the first plastic layer 3 has pockets 5 which are used to hold the heating element 2 encapsulated with the first plastic layer 3 during the second encapsulation. This will be described below with reference to FIGS. 3 to 7.
  • FIG. 3 shows schematically a plan view of the heater 1. There is one
  • FIG. 4 thus shows the sectional view along the section A-A.
  • the heater 1 has, in addition to the heating element 2, the first plastic layer 3 and the second plastic layer 4. Furthermore, it can be seen that the second
  • the heating element 2 completely and in particular fluid-tight surrounds, since in particular the resulting from the fixing elements 7 openings 19 of the first plastic layer 3 are filled by the second plastic layer 4.
  • pockets 5 are formed by the first plastic layer 3, wherein the pockets 5 are advantageously enlarged by the second plastic layer 4, in particular along a central axis of the pockets 5.
  • the pockets 5 are shown in detail in FIGS. 5 to 7, with FIGS. 5 to 7 each schematically showing the area B in FIG. 4 in detail.
  • each pocket 5 is formed by the first plastic layer 3.
  • the pocket 5 has in particular an inner volume, wherein a retaining pin or the like can engage in the inner volume of the pocket 5, so as to hold the over-molded with the first plastic layer 3 heating element 2 for the second encapsulation.
  • the inner volume of the pocket 5 is a cylinder volume, so that cylindrical retaining pins in the pockets
  • the first plastic layer 3 Due to the concerns of the retaining pins on the pocket 5 and thus on the first plastic layer 3, the first plastic layer 3 is thus not surrounded by the second plastic layer 4 within the pocket 5, since penetration of plastic between the retaining pin and the first plastic layer 3 during the second Umspritzens is not possible. Rather, a seam 6 is formed between the first plastic 3 and the second plastic layer 4. However, this seam 6 lies inside the pocket 5.
  • a seam 6 between the first plastic layer 3 and the second plastic layer 4 is a weak point, since fluid could possibly penetrate between the first plastic layer 3 and the second plastic layer 4 and thus could reach the heating element 2.
  • the pocket 5 is advantageously sealed.
  • the sealing of the pocket 5 is advantageously carried out by welding, this
  • FIG. 7 shows that the pockets 5 are the only points of the heater 1 which have a seam 6 between the first plastic layer 3 and the second plastic layer 4. Therefore, a sealing of the said seams is made easy and little effort. In particular, by fixing the heater 1 to the filter housing 14, said sealing is achieved.
  • Heating 1 easy and inexpensive to manufacture, while preventing the penetration of fluid into the heater 1.
  • Contact pocket 1 1 serves to receive the contacting points 10 of
  • FIGS. 8 to 11 describe an alternative embodiment for the production of the heater 1. While in the previously described
  • Embodiment of a sleeve shape of the heating element 2 was assumed during the first encapsulation is in the alternative
  • the heating element 2 plate-shaped.
  • the heating element 2 is a stamped grid, which has been punched out of a metal sheet, wherein the thickness of the metal sheet and thus of the heating element 2 is in particular less than 1, 0 mm, advantageously 0.6 mm.
  • the method is not limited to such material thicknesses. It can e.g. also be provided for material thicknesses greater than 1, 0 mm. For example, It can be designed for material thicknesses up to 3mm or up to 10mm or even for even larger material thicknesses.
  • the heating element 2 does not become out of the plate shape
  • Plastic layer 3 has a plurality of predefined kinks 8, wherein the predefined kinks 8 are provided for buckling of the first plastic layer 3.
  • a number of at least two kinks 8 are considered here among a multiplicity.
  • the predefined kinks 8 are generated by a locally reduced material thickness of the first plastic layer 3. In other embodiments, exactly one kink 8 may be provided.
  • Heating element 2 are executed. This is schematically shown in FIG. 10 and in FIG.
  • Figure 1 1 shown.
  • the sleeve shape of the heater 1 can be achieved by deforming the heating element 2 with the first plastic layer 3 after the first encapsulation, which is made possible by the kinks 8 of the first plastic layer 3.
  • the sleeve shape of the heater 1 can be achieved by deforming the heating element 2 with the first plastic layer 3 after the first encapsulation, which is made possible by the kinks 8 of the first plastic layer 3.
  • the holding element 9 may be formed, for example in the form of a snap hook or in the manner of a Clipses.
  • the heating element 2 with the first plastic layer 3 by the holding member 9 in the sleeve shape is preserved.
  • the pockets 5 are also provided, so that a simple fixing of the heating element 2 during the second encapsulation is made possible. In other embodiments, it is also possible to dispense with the provision of holding elements 9.
  • Plastic layer 3 can thus analogously as in the previously described
  • Embodiment provided with the second plastic layer 4 by the second encapsulation.
  • the fluid-tight surrounding of the heating element 2 with the second plastic layer 4 takes place.
  • the alternative embodiment has compared to the previously
  • Injection mold must be made.
  • FIG. 12 shows schematically a liquid filter 12
  • Liquid filter 12 has a housing 14, wherein the filter housing 14 comprises a lid 17 and a filter cup 18.
  • the lid 17 has an inlet 15, while the filter cup 18 has an outlet 16.
  • the filter medium 13 is hollow-cylindrical, wherein fluid can be supplied via an end face and the filtered fluid can be removed via a jacket side.
  • the heater 1 preferably extends in the form of a hollow cylinder around the filter medium 13.
  • the first encapsulation and the second encapsulation of the heating element 2 with a plastic ensure that the heater 1 is completely fluid-tight.
  • the pockets 5 (not shown in FIG. 12) are welded to the filter housing 14 so that the pockets 5 are also sealed.
  • the first plastic layer 3 and / or the second plastic layer 4 may preferably be formed from a thermoplastic and / or a duroplastic.
  • the thermoset epoxy resins, melamine resins, or phenolic resins are preferably used.
  • the thermoplastics used are preferably H-PE, PP, PA, PBT or PEEK.

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Filtering Materials (AREA)
  • Resistance Heating (AREA)

Abstract

La présente invention concerne un procédé de fabrication d'un élément électrique ou mécanique (1), l'élément (1) présentant une pièce (2) enrobée d'une matière plastique et le procédé comprenant les étapes suivantes : au moins un premier enrobage de la pièce (2) par une première couche de matière plastique (3), et un second enrobage de la pièce (2) par une seconde couche de matière plastique (4), une poche (5) étant formée pendant le premier enrobage et servant à fixer la pièce (2) pour le second enrobage.
PCT/EP2017/080899 2016-11-30 2017-11-30 Procédé de fabrication d'un élément électrique ou mécanique WO2018100021A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102016223816.7A DE102016223816A1 (de) 2016-11-30 2016-11-30 Verfahren zum Herstellen eines elektrischen oder mechanischen Elements
DE102016223816.7 2016-11-30

Publications (1)

Publication Number Publication Date
WO2018100021A1 true WO2018100021A1 (fr) 2018-06-07

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0500219A1 (fr) * 1991-02-18 1992-08-26 Sumitomo Wiring Systems, Ltd. Procédé pour la fabrication d'un insert en métal et résine; connecteur pour injecteurs de carburant et procédé pour la réalisation de ce connecteur
EP0653278A1 (fr) * 1993-11-17 1995-05-17 Sumitomo Wiring Systems, Ltd. Procédé de surmoulage d'un insert métallique et un bloc de connexion pour injecteurs pour un moteur à combustion interne
DE102006034077A1 (de) * 2005-08-16 2007-02-22 Robert Bosch Gmbh Filtereinrichtung mit einer Heizung
US20100207295A1 (en) * 2008-01-21 2010-08-19 Rolf Goetz Method and device for producing a magnetic field sensor

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH08227637A (ja) * 1994-02-23 1996-09-03 Matsushita Electric Works Ltd コントロールスイッチ及びその製造方法
DE19612765A1 (de) * 1996-03-29 1997-11-13 Teves Gmbh Alfred Kunststoffsensor und Verfahren zu dessen Herstellung
US5948991A (en) * 1996-12-09 1999-09-07 Denso Corporation Semiconductor physical quantity sensor device having semiconductor sensor chip integrated with semiconductor circuit chip
DE102007005771B4 (de) 2007-02-06 2017-07-06 Robert Bosch Gmbh Filtereinrichtung, insbesondere Flüssigkeitsfilter, mit einer Heizung

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0500219A1 (fr) * 1991-02-18 1992-08-26 Sumitomo Wiring Systems, Ltd. Procédé pour la fabrication d'un insert en métal et résine; connecteur pour injecteurs de carburant et procédé pour la réalisation de ce connecteur
EP0653278A1 (fr) * 1993-11-17 1995-05-17 Sumitomo Wiring Systems, Ltd. Procédé de surmoulage d'un insert métallique et un bloc de connexion pour injecteurs pour un moteur à combustion interne
DE102006034077A1 (de) * 2005-08-16 2007-02-22 Robert Bosch Gmbh Filtereinrichtung mit einer Heizung
US20100207295A1 (en) * 2008-01-21 2010-08-19 Rolf Goetz Method and device for producing a magnetic field sensor

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