GB2282554A - Assemblying parts of gasifiable patterns and apparatus therefor - Google Patents

Assemblying parts of gasifiable patterns and apparatus therefor Download PDF

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Publication number
GB2282554A
GB2282554A GB9420219A GB9420219A GB2282554A GB 2282554 A GB2282554 A GB 2282554A GB 9420219 A GB9420219 A GB 9420219A GB 9420219 A GB9420219 A GB 9420219A GB 2282554 A GB2282554 A GB 2282554A
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GB
United Kingdom
Prior art keywords
pattern
adhesive
joining surface
coated
lipped
Prior art date
Legal status (The legal status 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 status listed.)
Granted
Application number
GB9420219A
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GB9420219D0 (en
GB2282554B (en
Inventor
Pascal Sourlier
Jacky Boca
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Pont a Mousson SA
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Pont a Mousson SA
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Publication date
Application filed by Pont a Mousson SA filed Critical Pont a Mousson SA
Publication of GB9420219D0 publication Critical patent/GB9420219D0/en
Publication of GB2282554A publication Critical patent/GB2282554A/en
Application granted granted Critical
Publication of GB2282554B publication Critical patent/GB2282554B/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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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
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/50—General aspects of joining tubular articles; General aspects of joining long products, i.e. bars or profiled elements; General aspects of joining single elements to tubular articles, hollow articles or bars; General aspects of joining several hollow-preforms to form hollow or tubular articles
    • B29C66/51—Joining tubular articles, profiled elements or bars; Joining single elements to tubular articles, hollow articles or bars; Joining several hollow-preforms to form hollow or tubular articles
    • B29C66/54—Joining several hollow-preforms, e.g. half-shells, to form hollow articles, e.g. for making balls, containers; Joining several hollow-preforms, e.g. half-cylinders, to form tubular articles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C5/00—Apparatus in which liquid or other fluent material is projected, poured or allowed to flow on to the surface of the work
    • B05C5/001—Apparatus in which liquid or other fluent material is projected, poured or allowed to flow on to the surface of the work incorporating means for heating or cooling the liquid or other fluent material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C5/00—Apparatus in which liquid or other fluent material is projected, poured or allowed to flow on to the surface of the work
    • B05C5/02—Apparatus in which liquid or other fluent material is projected, poured or allowed to flow on to the surface of the work the liquid or other fluent material being discharged through an outlet orifice by pressure, e.g. from an outlet device in contact or almost in contact, with the work
    • B05C5/0208—Apparatus in which liquid or other fluent material is projected, poured or allowed to flow on to the surface of the work the liquid or other fluent material being discharged through an outlet orifice by pressure, e.g. from an outlet device in contact or almost in contact, with the work for applying liquid or other fluent material to separate articles
    • B05C5/0212—Apparatus in which liquid or other fluent material is projected, poured or allowed to flow on to the surface of the work the liquid or other fluent material being discharged through an outlet orifice by pressure, e.g. from an outlet device in contact or almost in contact, with the work for applying liquid or other fluent material to separate articles only at particular parts of the articles
    • B05C5/0216—Apparatus in which liquid or other fluent material is projected, poured or allowed to flow on to the surface of the work the liquid or other fluent material being discharged through an outlet orifice by pressure, e.g. from an outlet device in contact or almost in contact, with the work for applying liquid or other fluent material to separate articles only at particular parts of the articles by relative movement of article and outlet according to a predetermined path
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C5/00—Apparatus in which liquid or other fluent material is projected, poured or allowed to flow on to the surface of the work
    • B05C5/02—Apparatus in which liquid or other fluent material is projected, poured or allowed to flow on to the surface of the work the liquid or other fluent material being discharged through an outlet orifice by pressure, e.g. from an outlet device in contact or almost in contact, with the work
    • B05C5/0208—Apparatus in which liquid or other fluent material is projected, poured or allowed to flow on to the surface of the work the liquid or other fluent material being discharged through an outlet orifice by pressure, e.g. from an outlet device in contact or almost in contact, with the work for applying liquid or other fluent material to separate articles
    • B05C5/0212—Apparatus in which liquid or other fluent material is projected, poured or allowed to flow on to the surface of the work the liquid or other fluent material being discharged through an outlet orifice by pressure, e.g. from an outlet device in contact or almost in contact, with the work for applying liquid or other fluent material to separate articles only at particular parts of the articles
    • B05C5/0216—Apparatus in which liquid or other fluent material is projected, poured or allowed to flow on to the surface of the work the liquid or other fluent material being discharged through an outlet orifice by pressure, e.g. from an outlet device in contact or almost in contact, with the work for applying liquid or other fluent material to separate articles only at particular parts of the articles by relative movement of article and outlet according to a predetermined path
    • B05C5/022—Apparatus in which liquid or other fluent material is projected, poured or allowed to flow on to the surface of the work the liquid or other fluent material being discharged through an outlet orifice by pressure, e.g. from an outlet device in contact or almost in contact, with the work for applying liquid or other fluent material to separate articles only at particular parts of the articles by relative movement of article and outlet according to a predetermined path the outlet being fixed during operation
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C7/00—Patterns; Manufacture thereof so far as not provided for in other classes
    • B22C7/02—Lost patterns
    • B22C7/023—Patterns made from expanded plastic materials
    • B22C7/026—Patterns made from expanded plastic materials by assembling preformed parts
    • 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
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/48—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using adhesives, i.e. using supplementary joining material; solvent bonding
    • B29C65/52—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using adhesives, i.e. using supplementary joining material; solvent bonding characterised by the way of applying the adhesive
    • B29C65/524—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using adhesives, i.e. using supplementary joining material; solvent bonding characterised by the way of applying the adhesive by applying the adhesive from an outlet device in contact with, or almost in contact with, the surface of the part to be joined
    • 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
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/05—Particular design of joint configurations
    • B29C66/10—Particular design of joint configurations particular design of the joint cross-sections
    • B29C66/11—Joint cross-sections comprising a single joint-segment, i.e. one of the parts to be joined comprising a single joint-segment in the joint cross-section
    • B29C66/114—Single butt joints
    • B29C66/1142—Single butt to butt joints
    • 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
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/32—Measures for keeping the burr form under control; Avoiding burr formation; Shaping the burr
    • B29C66/324—Avoiding burr formation
    • 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
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/72—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the structure of the material of the parts to be joined
    • B29C66/727—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the structure of the material of the parts to be joined being porous, e.g. foam
    • 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
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/83—General aspects of machine operations or constructions and parts thereof characterised by the movement of the joining or pressing tools
    • B29C66/832—Reciprocating joining or pressing tools
    • B29C66/8322—Joining or pressing tools reciprocating along one axis
    • 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
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/48—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using adhesives, i.e. using supplementary joining material; solvent bonding
    • B29C65/4805—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using adhesives, i.e. using supplementary joining material; solvent bonding characterised by the type of adhesives
    • B29C65/481—Non-reactive adhesives, e.g. physically hardening adhesives
    • B29C65/4815—Hot melt adhesives, e.g. thermoplastic adhesives
    • 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
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/50—General aspects of joining tubular articles; General aspects of joining long products, i.e. bars or profiled elements; General aspects of joining single elements to tubular articles, hollow articles or bars; General aspects of joining several hollow-preforms to form hollow or tubular articles
    • B29C66/51—Joining tubular articles, profiled elements or bars; Joining single elements to tubular articles, hollow articles or bars; Joining several hollow-preforms to form hollow or tubular articles
    • B29C66/52—Joining tubular articles, bars or profiled elements
    • B29C66/522—Joining tubular articles
    • B29C66/5224—Joining tubular articles for forming fork-shaped connections, e.g. for making Y-shaped pieces
    • B29C66/52241—Joining tubular articles for forming fork-shaped connections, e.g. for making Y-shaped pieces with two right angles, e.g. for making T-shaped pieces
    • 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
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/50—General aspects of joining tubular articles; General aspects of joining long products, i.e. bars or profiled elements; General aspects of joining single elements to tubular articles, hollow articles or bars; General aspects of joining several hollow-preforms to form hollow or tubular articles
    • B29C66/65—General aspects of joining tubular articles; General aspects of joining long products, i.e. bars or profiled elements; General aspects of joining single elements to tubular articles, hollow articles or bars; General aspects of joining several hollow-preforms to form hollow or tubular articles with a relative motion between the article and the welding tool
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2105/00—Condition, form or state of moulded material or of the material to be shaped
    • B29K2105/04—Condition, form or state of moulded material or of the material to be shaped cellular or porous
    • 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
    • B29L2031/757—Moulds, cores, dies

Abstract

A method for assembling the parts of gasifiable patterns for investment casing in foundry work through applying a layer of a material with adhesive properties to at least one surface which is joined to at least one part of the pattern is characterised in that the applied layer is a regular film of constant thickness having a surface area identical to the joining surface of the pattern part. The pattern may be formed of foamed polymer. A means for effecting this method comprises a reservoir 1 connected to at least one lipped nozzle 2 which is fixed while coating takes place and a moving support 7 for the pattern parts 5 which are to be coated. The nozzle is supported by a positioning means 4 which is adjustable so as to move and rotate along and around its axis. <IMAGE>

Description

METHOD AND MEANS FOR THE ASSEMBLY OF PARTS OF GASIFIABLE PATTERNS USED IN FOUNDRY WORK This invention relates to precision casting in foundry work using gasifiable patterns. In particular it relates to a method of assembling the parts of patterns by bonding with adhesives. It relates in particular to a method of applying a material having adhesive properties to a surface of at least part of a pattern which is assembled together with one or more other parts in an assembly. The material with adhesive properties may for example be a hot melt adhesive.
Methods for assembling the parts of gasifiable patterns by adhesive bonding in which the material having adhesive properties is transferred from a reservoir to the surfaces which are to be coated with adhesive by means of a rigid or flexible application mask, which is initially loaded with adhesive by immersion or by any other appropriate means, are already known. The shape of the said mask can correspond to the pattern of the adhesive applied to the said surfaces by simple contact.
These methods of assembly have many disadvantages: - application of adhesive to the surface involved in assembly requires two operations (deposition un the mask, then transfer to the part of the pattern), - the choice of adhesive, the physical and rheological properties of which must be appropriate for the process, - heat control in the application plate.
Also transfer of the adhesive frequently results in the application of too much or too little, and it may be contaminated with impurities resulting from previous coating operations which may have a harmful effect on correct assembly of the pattern parts. Where two pattern parts, one of which is coated with adhesive, are assembled and then compressed, this can lead to the formation of defects such as beads or a shortage of adhesive along the joic line in a pattern. These defects result first in surface imperfections in the metal parts produced, with possible difficulties in the application of a subsequent protective coating. Secondly, apart from an adverse effect on visual appearance, these defects can result in a casting being rejected. For example the existence of beads of adhesive can give rise to soundness defects in metal parts obtained by this process because of the large quantities of gas which have to be discharged when the adhesive is destroyed through the action of the liquid metal, while a lack of adhesive may favour the formation of inclusions of the refractory coating used and thus cause void defects in the casting obtained.
The purpose of the method according to this invention is to overcome these disadvantages. With this object the method according to the invention relates to the assembly of parts of gasifiable patterns used in foundry work for the investment casting process by applying a layer of a material having adhesive properties to at least one joining surface of at least the pattern part and by assembling at least one other part of the pattern to the said joining surface where the layer of material with adhesive properties is a regular film of constant thickness having an identical surface area to the surface of the pattern part which is to be coated.
In accordance with other features of the invention: - the material with adhesive properties is an adhesive product, which may or may not contain solvent, which can be used hot or cold, and which can be applied using a lipped nozzle, - the gasifiable pattern is made of a foamed polymer material, - the part of the pattern which is to be coated may have a joining surface which lies entirely within one plane or has the shape of a truncated cone, - the joining surface consists of a strip of constant width incorporating curved or straight shapes.
The invention also relates to means for implementing the method comprising a reservoir of adhesive connected to at least one lipped nozzle, which is fixed while application is in progress, and a moving support for the pattern parts which are to be coated. In this installation the iipped nozzle has a gauged downstream opening of rectangular cross-section having a width of less than 0.1 millimetres, - the axis of the lipped nozzle is located substantially perpendicular to the surface of the joint which is to be bonded, - the length of the rectangle formed by the downstream opening of the lipped nozzle is equal to the width of the strip which has to be coated and forms the joining surface for the pattern part, - the length of the downstream opening of the lipped nozzle is perpendicular to the direction of movement of the strip being coated, - the moving support for the pattern part incorporates means to shape the pattern part which is to be coated, - the moving support incorporates a backing piece having a contour identical to that of the joining surface, which acts together with the advancing means, - the backing piece is provided with two grooves, the axes of which are located in a plane parallel to the plane of the surface which is to be coated and which house feed rollers coated with a material which prevents any slip between the said backing piece and the said rollers, - the device incorporates a combination of lipped nozzles which are offset along the Z axis.
The invention also relates to a gasifiable pattern obtained by the method according to the invention which is sufficiently rigid to avoid any risk of failure of the bonded joints as a result of the mechanical stresses to which it is subjected during the stages of casting.
Finally the invention relates to the use of gasifiable patterns assembled using the abovementioned method to manufacture metal castings in foundry work.
A non-restrictive embodiment of the InventIon will be described below with reference to the appended drawings in which: - Figure 1 is a diagrammatical view of a component of the means according to the invention, - Figure 2 is a view in cross-section of a mobile support 7 for the means according to Figure 1 and the means causing it to be in motion, - Figure 3 shows a particular embodiment of the means according to the invention at a given time during the assembly process.
Figure 1 shows a component of the means according to the invention comprising a reservoir of adhesive 1 connected to a lipped nozzle 2 by a flexible pipe 3, of known types. Said nozzle 2 is supported by positioning means 4 which can be adjusted so as to move and rotate along and around the axis shown by the arrows. These said means 4, of a known type, make it possible to adJust the position of nozzle 2 with respect to the joining surface 8 which is to be coated and to deposit a film of adhesive while assembly 9, which comprises moving support 7, the pattern part 5 which is to be coated placed in its shaping means 6, and backing piece 15, is in motion. Said lipped nozzle 2, which can deposit an adjustable width of adhesive equal to the width of the strip forming the joining surface 8 for pattern part 5 is positioned in such a way that the longer dimension of its opening, which governs the width of the adhesive film, is perpendicular to the axis along which said strip 8 moves and in such a way that the two widths act together.
Figure 2 shows the device for moving assembly 9. Said assembly 9 rests on a horizontal support 11, which forms a frame, through rolling supports of which two, 14a and 14b, are visible. This is driven by a motor 12, of a known type, which is integral with support 11, causing a roller lOa to rotate and move backing piece 15 which is held firm radially by a second passive roller lOb which is also integral with support 11, and exerts a tightening force against backing piece 15 through a compression member 16. When drive roller lOa is caused to rotate, backing piece 15 is moved between said rollers 10a and lOb thus ensuring that joining surface 18 is guided beneath the orifice of lipped nozzle 2 which delivers its film of adhesive in a single pass.
For reliable control of the movement of joining surface 8 with respect to lipped nozzle 2, backing piece 15 is provided with two grooves 13 housing rollers 10a and 10b, the axis of the said grooves iying in a plane parallel to the plane of the surface which is to be coated. To avoid any slip between backing piece 15 and drive roller 10a the latter is coated with a suitable material. Finally the arrangement is such that assembly 9 is readily interchangeable.
The assembly resulting from the combination of the components illustrated in Figures 1 and 2 is located in the installation shown diagrammatically in Figure 3, in which, in a non-restrictive embodiment, positioning means 4, which are integral with a frame 17, can be adjusted with respect to the installation as a whole, as can grasping means, which are not shown, for complementary pattern parts 18a and 18b which are provided with movable shaping devices 19a and 19b. Support 11, which is supported by frame 17 and which moves as shown by the arrows, incorporates two assemblies 9a and 9b equipped with their drive means illustrated in Figure 2.
The operation of the means according to the invention is as follows: At a time t = 0 the installation is in the position where: - an assembled pattern is at location b, - a part 5a which is to be coated is in shaping device 6a, - a pattern part 5b, in its shaping device 6b, has just been coated, - a complementary pattern part 18b is in position in its shaping device 19b, and held by grasping means, which are not shown.
Then, - support 11 is moved by appropriate means, which are not shown, in such a way that the following occurs simultaneously: - assembly 9a, which comprises pattern part 5a which is to be coated, placed in its shaping device 6a fixed on moving support 7a, is at location a, in a position such that the axis Z of lipped nozzle 2 is positioned perpendicular to joining surface 8a and the length of its downstream opening corresponds exactly to the width of the strip which is to be coated with adhesive, - assembly 9b, comprising pattern part 5b which is to be coated placed in its shaping device 6b fixed to moving support 7b, is at location c so that the two pattern parts which have to be assembled, 5b and 18b, can be placed in their correct relative positions.
- Complementary pattern part 18b is lowered so that the joining surfaces of pattern parts 5b and 18b coincide exactly and are bonded together by applying slight pressure. As the adhesive has been deposited in a very small quantity and covers all joining surface 8b there is no movement by the adhesive in the course of the assembly operation, and therefore no beads or uncoated portions are produced. Afterwards the assembled pattern is raised up and another pattern part Sc which is to be coated, which is not shown, is placed in shaping device 6b.
Simultaneously with this assembly operation and at an appropriate instant pattern part 5a is coated as follows: - lipped nozzle 2 is lowered, - motor 12a is brought into operation, and then the adhesive is deposited by the said lipped nozzle 2 for a period such that joining surface 8A receives a single thickness of adhesive material over its entire surface, - lipped nozzle 2 is again raised.
While these two mechanised operations are being performed at location B, the assembled pattern is discharged and a complementary pattern part 18a is put into place.
- After joining surface 8a of pattern part 5a has been coated with adhesive, support 11 is again moved so that assembly 9a is at location B and assembly 9b is at location A.
pattern parts 5a and 18a are then assembled (complementary pattern part 18a is lowered, the assembled pattern is bonded and raised again), while pattern part Sc is coated with adhesive.
Simultaneously with these operations, at location C, the assembled pattern (5b + 18b) will have been discharged and another complementary pattern part 18c, which is not shown, will have replaced it. After the assembled pattern (18A + 59.) has been discharged another pattern part 5D, not shown, will be placed in shaping device 6A.
All the stages described then repeat in the same order.
The invention makes it possible to apply adhesive directly to a pattern part with a constant and regular film thickness. Furthermore the adhesive used is always clean, because it is never recycled downstream from the nozzle.
The invention thus makes it possible to obtain patterns without any excess adhesive or lack of adhesive which would be harmful to the soundness of the castings obtained through the use of gasifiable patterns assembled in this way.

Claims (16)

1. A method for assembling gasifiable pattern parts for investment casting in foundry work by applying a layer of a material with adhesive properties to at least one joining surface (8) of at least one pattern part (5) and by assembling at least one other pattern part (18) with the said joining surface (8), characterised in that the applied layer is a regular film of constant thickness having a surface area identical to the joining surface (8) of the pattern part (5).
2. A method according to claim 1, characterised in that the material with adhesive properties is an adhesive product, which may or may not contain solvent, which may be used hot or cold, which can be applied at least by means of a lipped nozzle.
3. A method according to one of the foregoing claims, characterised in that gasifiable pattern comprises a foamed polymer material.
4. A method according to one of claims 1 to 3, characterised in that the joining surface (8) all lies within one plane.
5. . < method according to one of claims 1 to 3, characterised in that the joining surface (8) has the shape of a truncated cone.
6. A method according to one of claims 1 to 5, characterised in that the joining surface (8) comprises a strip of constant width incorporating curved or straight shapes.
7. Means for implementing the method according to any one of claims 1 to 6 of the type comprising a reservoir of adhesive (1) connected to at least one lipped nozzle (2), which is fixed while coating takes place, and a moving support (7) for the pattern parts (5) which are to be coated, characterised in that the said lipped nozzle (2) has a gauged downstream opening of rectangular cross-section whose With is less than C.1 millimetres.
8. means according to claim 7, characterised in that the axis Z of the lipped nozzle (2) is positioned substantially perpendicular to the joining surface (8) which is to be coated.
9. Means according to claim 7 or 8, characterised in that the length of the rectangle formed by the downstream opening of the lipped nozzle (2) is equal to the width of the adhesive strip forming the joining surface (8j of the pattern part (5).
10. Means according to one of claims 7 to 9, characterised in that the length of the downstream opening of the lipped nozzle (2) is perpendicular to the direction of movement of the strip (8) which is to be coated.
11. Means according to any one of claims 7 to 10, characterised in that the moving support (7) for the pattern part (5) incorporates a shaping device (6) for the pattern part which is to be coated.
12. Means according to any one of claims 7 to 11, characterised in that the moving support (7) incorporates a backing piece (15) having a contour identical to that of the joining surface (8) which acts together with the drive means (10 a, 10b, 12).
13. Means according to any one of claims 7 to 12, characterised in that the backing piece (15) incorporates two grooves (13) whose axis lies in a plane parallel to the plane of the surface being coated and which house the drive rollers (lOA, 10B) which are coated with a material which avoids any slip between the backing piece and the rollers.
14. Means according to any one of claims 7 to 13, characterised in that it comprises a combination of lipped nozzles offset along the Z axis.
15. A gasifiable pattern assembled by adhesive bonding which can be obtained by the method according to any one of claims 1 to 6, characterised in that it has sufficient rigidity to prevent any risk of failure of the adhesive as a result of the mechanical stresses to which it will be subjected during the stages of casting.
16. Use of gasifiable patterns assembled in accordance with one of claims 1 to 6 for the manufacture of metal castings in foundry work.
GB9420219A 1993-10-06 1994-10-06 Method and means for the assembly of parts of gasifiable patterns used in foundry work Expired - Fee Related GB2282554B (en)

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FR9312052A FR2710864B1 (en) 1993-10-06 1993-10-06 Method and installation for assembling parts of gasifiable models used in foundries.

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GB9420219D0 GB9420219D0 (en) 1994-11-23
GB2282554A true GB2282554A (en) 1995-04-12
GB2282554B GB2282554B (en) 1997-09-03

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US9095872B2 (en) 2013-07-26 2015-08-04 The Boeing Company Feedback control system for performing fluid dispensing operations
US9757759B2 (en) 2013-08-09 2017-09-12 The Boeing Company Method and apparatus for concurrently dispensing and fairing high viscosity fluid
US9884329B2 (en) 2015-03-19 2018-02-06 The Boeing Company Adhesive applicator having reversibly extensible first and second edges
US10086402B2 (en) 2013-09-03 2018-10-02 The Boeing Company Tool for applying a fluid onto a surface
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US9016530B2 (en) 2013-05-03 2015-04-28 The Boeing Company Control valve having a disposable valve body
US9095872B2 (en) 2013-07-26 2015-08-04 The Boeing Company Feedback control system for performing fluid dispensing operations
US9757759B2 (en) 2013-08-09 2017-09-12 The Boeing Company Method and apparatus for concurrently dispensing and fairing high viscosity fluid
US10525603B2 (en) 2013-08-22 2020-01-07 The Boeing Company Method and apparatus for exchanging nozzles and tips for a fluid dispensing system
US10086402B2 (en) 2013-09-03 2018-10-02 The Boeing Company Tool for applying a fluid onto a surface
CN104148240A (en) * 2014-08-13 2014-11-19 苏州普京真空技术有限公司 Dispensing device for quartz crystal
US9884329B2 (en) 2015-03-19 2018-02-06 The Boeing Company Adhesive applicator having reversibly extensible first and second edges
US10583444B2 (en) 2015-03-19 2020-03-10 The Boeing Company Methods for bead application

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Publication number Publication date
GB9420219D0 (en) 1994-11-23
FR2710864B1 (en) 1995-12-08
GB2282554B (en) 1997-09-03
FR2710864A1 (en) 1995-04-14

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