EP3774115A1 - Verfahren zur herstellung eines wendelförmigen giessmodells - Google Patents
Verfahren zur herstellung eines wendelförmigen giessmodellsInfo
- Publication number
- EP3774115A1 EP3774115A1 EP19719195.0A EP19719195A EP3774115A1 EP 3774115 A1 EP3774115 A1 EP 3774115A1 EP 19719195 A EP19719195 A EP 19719195A EP 3774115 A1 EP3774115 A1 EP 3774115A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- model body
- longitudinal axis
- machining tool
- recess
- model
- 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.)
- Pending
Links
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 22
- 229920001577 copolymer Polymers 0.000 claims abstract description 4
- 238000004453 electron probe microanalysis Methods 0.000 claims abstract description 3
- 238000003754 machining Methods 0.000 claims description 110
- 238000000034 method Methods 0.000 claims description 43
- 238000005266 casting Methods 0.000 claims description 32
- 238000010438 heat treatment Methods 0.000 claims description 12
- 239000002184 metal Substances 0.000 claims description 7
- 238000001816 cooling Methods 0.000 claims description 6
- 238000002844 melting Methods 0.000 claims description 6
- 230000008018 melting Effects 0.000 claims description 6
- 230000005484 gravity Effects 0.000 claims description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 2
- 108090000623 proteins and genes Proteins 0.000 claims 1
- 239000000463 material Substances 0.000 description 13
- 239000001993 wax Substances 0.000 description 5
- 238000005520 cutting process Methods 0.000 description 4
- 238000005058 metal casting Methods 0.000 description 3
- -1 polyethylene terephthalate Polymers 0.000 description 3
- 239000004696 Poly ether ether ketone Substances 0.000 description 2
- 239000004952 Polyamide Substances 0.000 description 2
- 239000004698 Polyethylene Substances 0.000 description 2
- 239000004743 Polypropylene Substances 0.000 description 2
- 239000004793 Polystyrene Substances 0.000 description 2
- 238000002788 crimping Methods 0.000 description 2
- 239000006260 foam Substances 0.000 description 2
- 238000005187 foaming Methods 0.000 description 2
- 238000005495 investment casting Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 230000003534 oscillatory effect Effects 0.000 description 2
- 229920003023 plastic Polymers 0.000 description 2
- 239000004033 plastic Substances 0.000 description 2
- 229920003229 poly(methyl methacrylate) Polymers 0.000 description 2
- 229920002647 polyamide Polymers 0.000 description 2
- 229920002530 polyetherether ketone Polymers 0.000 description 2
- 229920000573 polyethylene Polymers 0.000 description 2
- 239000005020 polyethylene terephthalate Substances 0.000 description 2
- 229920000139 polyethylene terephthalate Polymers 0.000 description 2
- 239000004926 polymethyl methacrylate Substances 0.000 description 2
- 229920001155 polypropylene Polymers 0.000 description 2
- 229920001169 thermoplastic Polymers 0.000 description 2
- 239000004416 thermosoftening plastic Substances 0.000 description 2
- 238000004804 winding Methods 0.000 description 2
- 208000031872 Body Remains Diseases 0.000 description 1
- 229920002160 Celluloid Polymers 0.000 description 1
- 101100390736 Danio rerio fign gene Proteins 0.000 description 1
- 101100390738 Mus musculus Fign gene Proteins 0.000 description 1
- 238000002679 ablation Methods 0.000 description 1
- 239000004676 acrylonitrile butadiene styrene Substances 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000007795 chemical reaction product Substances 0.000 description 1
- 210000003092 coiled body Anatomy 0.000 description 1
- 239000002826 coolant Substances 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 238000005304 joining Methods 0.000 description 1
- 238000011089 mechanical engineering Methods 0.000 description 1
- 239000004417 polycarbonate Substances 0.000 description 1
- 229920000515 polycarbonate Polymers 0.000 description 1
- 229920000098 polyolefin Polymers 0.000 description 1
- 229920002223 polystyrene Polymers 0.000 description 1
- 239000004800 polyvinyl chloride Substances 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 238000005476 soldering Methods 0.000 description 1
- 239000007858 starting material Substances 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
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
- B29C59/00—Surface shaping of articles, e.g. embossing; Apparatus therefor
- B29C59/02—Surface shaping of articles, e.g. embossing; Apparatus therefor by mechanical means, e.g. pressing
-
- 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
-
- 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
-
- 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
- B29C59/00—Surface shaping of articles, e.g. embossing; Apparatus therefor
- B29C59/08—Surface shaping of articles, e.g. embossing; Apparatus therefor by flame treatment ; using hot gases
-
- 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
- B29C59/00—Surface shaping of articles, e.g. embossing; Apparatus therefor
- B29C59/16—Surface shaping of articles, e.g. embossing; Apparatus therefor by wave energy or particle radiation, e.g. infrared heating
-
- 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
- B29C59/00—Surface shaping of articles, e.g. embossing; Apparatus therefor
- B29C59/02—Surface shaping of articles, e.g. embossing; Apparatus therefor by mechanical means, e.g. pressing
- B29C2059/028—Incorporating particles by impact in the surface, e.g. using fluid jets or explosive forces to implant particles
Definitions
- the invention is in the field of mechanical engineering, more specifically in the field of foundry technology, and can be used with particular advantage in processes in which a lost model is used, such as in the so-called Lost-Foam process or Vollformg screen compiler, and in precision casting process. If coiled bodies are to be produced in a casting process, then the casting process with lost form is particularly well suited for this purpose.
- Lost forms can be produced in the form of dissolvable model bodies, which are dissolved, for example during metal casting by the hot molten metal and volatilize or escape from the space occupied by the lost form space and are urged by the molten metal ver.
- the production of such model bodies which essentially specify the shape for the body to be produced later in the casting process, can be complex depending on the complexity of the bodies to be cast.
- additional requirements with respect to the electrical conductivity and / or the homogeneity of material properties are added.
- the present invention is based on the background of the prior art, the object to provide a method for producing a helical casting model that allows the production of even complex casting models in series with little effort and is so variable that the shape of the casting model is easily adaptable to changed requirements of the casting.
- the invention relates to a processing device according to claim 19 and implementations of this device, which are represented in the claims related thereto.
- the invention accordingly relates to a method for producing a helical casting model in which a strand-shaped model body, in particular from EPS, EPMA, copolymer or a wax, with a central longitudinal axis, extending in the direction of the longitudinal axis centric cavity and a cavity surrounding the model body wall on the one hand and a machining tool for generating a recess from the other hand be arranged such that the editing tool extending in the radial direction with respect to the longitudinal axis at least partially, in particular completely, through the model body wall and that the machining tool and / or the model body are driven to rotate about the longitudinal axis of the model body or an axis parallel to this relative to each other, wherein during or alternately with the Rotation movement is generated steadily or at least temporarily a Relativbe movement between the model body and the machining tool in the direction parallel to the longitudinal axis.
- a strand-shaped model body in particular from EPS, EPMA, copolymer or a wax
- the processing tool is configured to displace, remove, or erode the material of the model body, or otherwise to selectively create a cavity in the material. This can be done in particular in a single operation.
- a machining tool and a hot air jet a water jet or laser beam can be used.
- the beam source is located in the middle of the model to be processed.
- the beam source and / or the model can rotate, move up and down on the Z axis, and in particular move to a constant distance between the beam source and the processing point on a curved path in the X-Y plane.
- the movement for producing the spiral takes place, for example, as in the above-described machining tool.
- a helical recess is thus introduced by a machining tool in the model body.
- the loading processing tool is disposed within the cavity in the interior of the model body and pivoted so that it passes through the model body wall and removes or displaces the material of the model body.
- the editing tool can this, as will be shown in more detail below, For example, saw blade-like, rasp-like or configured in the form of a heating wire.
- thermoplastics As materials, for example, generally thermoplastics can be used, which are melted or gasified at the temperature of the metal to be cast during the casting process and step out of the mold.
- the following substances can be used as exemplary thermoplastics: acrylonitrile-butadiene-styrene (ABS), polyamides (PA),
- PMMA polymethyl methacrylate
- PC polycarbonate
- PET polyethylene terephthalate
- PE polyolefins such as polyethylene (PE) and
- Polypropylene PP
- polystyrene PS or EPS
- polyetheretherketone PEEK
- polyvinyl chloride PVC
- celluloid celluloid
- waxes such as those used in precision casting or mixtures of waxes and plastics can be used.
- a substantially slices-shaped recess can be introduced into the model body. Simultaneously or alternately with this movement, the machining tool can be moved along the longitudinal axis of the model body, so that the movement path of the machining tool is inclined relative to the longitudinal axis of the model body and thus a helical recess in the model body wall is generated.
- Model body which is designed so that the remaining part of the model body in itself has the shape of a helix. If this casting model is then poured out or cast off with a molten metal according to the method of the lost mold or of the lost model, in order to produce a casting mold. to create, so also has the cast body in the form of a helix and can be used for example as an electric coil or coil spring.
- Is in the arrangement of the cavity in the model body of this sym metric arranged to the longitudinal axis of the model body so may be a revolving model body wall with uniform thickness.
- a model body wall of variable thickness results along the circumference of the model body.
- the cavity can also vary along the longitudinal axis of the model body, for example tapered or pyramid-shaped. This results in a variable wall thickness of the model body wall along the longitudinal axis of the model body.
- These measures resulted ren in the later resulting cast body in a variable thickness of the turns of the resulting coil or spring.
- the pitch of the helical recess in the model body wall can be varied during manufacture or during the introduction of the recess in the model body wall by the speed of the thrust movement of the machining tool in relation to the rotational speed of the machining tool is varied.
- the helical casting model is advantageously shaped and dimensioned in such a way that it has the inherent stability necessary for further use in the process and that it does not noticeably deform due to its own weight or slight impacts during handling.
- the possible dimensions depend, therefore, among other things, on the material from which it is made.
- the individual turns of the helical model which are each formed strand-shaped, have a rectangular or oval cross-sectional shape.
- the dimensions of this cross-sectional shape of the strand forming the helix may be indicated in the radial direction with respect to the longitudinal axis of the helical model body and in the radial direction with respect to the same longitudinal axis. For example, these dimensions may be in parts or multiples of the radius of the helical model body at the location of its largest radius (r). are given.
- the dimension of the cross section of the strand-shaped helix in the radial direction may be at least 0.1 r, in particular at least 0.2 r or 0.3 r.
- This expansion may for example also be less than 0.8 r, in particular less than 0.5 r.
- this measure may be between 0.1 r and 0.8 r, or between 0.2 r and 0.5 r, or between 0.3 r and 0.5 r.
- the extent of the helix in the axial direction with respect to the longitudinal axis may be at least 0.1 r, in particular at least 0.2 r or 0.3 r.
- This expansion may for example also be less than 0.8 r, in particular less than 0.5 r.
- this measure can also be between 0.1 r and 0.8 r, or between 0.2 r and 0.5 r or between 0.3 r and 0.5 r.
- the cross-sectional shape of the strand forming the helix may be, for example, square.
- the ratio between the extent of the cross-section in the axial direction to the extent in the radial direction with respect to the longitudinal axis for example, between 0.3 to 1 and 1 to 0.3, in particular special between 0.5 to 1 and 1 to 0.5.
- the cross-sectional size of the helix can be greater than 0.01 r 2 , in particular greater than 0.05 r 2 , more particularly greater than 0.1 r 2 . These sizes can apply, for example, in the event that the helix consists of wax.
- the individual linear dimensions may satisfy the same conditions or be significantly smaller, for example smaller than half the dimensions indicated above, and the cross-sectional areas smaller than that 0.3 times the specified dimensions.
- An embodiment of the method may provide, for example, that the rotational speed of the rotating relative movement between the machining tool and the model body and / or the speed of the relative movement between the machining tool and the model body in the direction of the longitudinal axis during the production of a model body remains constant at least during a period of time. This results in at least one section of the model body along its axis, in which the recess introduced by the machining tool into the model body has the shape of a helix with a constant pitch.
- the introduced recess runs along its course in sections parallel to the longitudinal axis of the model body, namely, in a period of time, the rotational movement of the machining tool is stationary and the machining tool is moved Lich in the direction parallel to the longitudinal axis of the model body.
- the recess can also run in places or sections in a plane perpendicular to the longitudinal axis of the model body, namely, in a period of machining, the machining tool body is moved exclusively by a rotational movement about the axis of the model, without in this period of time a feed motion parallel to Longitudinal axis of the model body takes place.
- the rotational speed of the rotation-generating relative movement between the machining tool and the model body and / or the speed of the relative movement between the machining tool and the model body in the direction of the longitudinal axis during the production of a model body is changed.
- the helical recess in the model body does not represent a helix of constant pitch, but the pitch of the helix is variable along the longitudinal axis of the model body.
- two or more processing tools are moved simultaneously, in particular jointly, relative to the model body.
- several helical recesses are introduced into the model body, which are arranged inein other and are shifted from one another in the direction of the longitudinal axis of the model body.
- at least one machining tool has a strand or strip, in particular made of a metal, held between two bearing points, which is held taut during the relative movement of the model body and of the machining tool.
- one of the bearing points may be located within the cavity of the model body and the second radially outside of the model body.
- the curiously held between these strand or strip, which is a part of the machining tool, thus passes through the model body wall and can be designed, for example, rasp-like or saw blade-like or even after the manner of a hot wire staltet.
- At least one processing tool has a strand-shaped or strip-shaped, held only at a first end of its processing body.
- the bear processing tool is sufficiently rigid so that it can be held at one of its ends, in particular within the cavity, and moved through the model body wall.
- the machining tool may be formed in this case as a rigid wire or metal blade or similar, wherein the strip, wire or sheet may be straight or bent out forms.
- in the form of a hot wire can be achieved by means of a contouring of the hot wire, a desired shape of a individual helical turns of the model body. It is also possible to use several such machining tools at the same time, which have different angles of attack, so that a bleed of the contour of the individual helical turns of the model body can be achieved.
- a marking for example by a notch, can be selectively introduced, which can be used in a later method step for positioning a tool or a mold.
- At least one machining tool has a rotationally drivable circular disk. Due to the rotating disk which can be driven in rotation, a cut can be made in the model body. be introduced, wherein the circular disc can be designed either as a knife or as a circular saw blade.
- At least one machining tool during the manufacturing process is heated. If the processing tool heated to tempera tures, which are in the range of the melting point of the material of which the model body consists, the method of hot wire cutting can be used.
- a machining or abrading machining by means of a strangförmi conditions machining tool sought it can be provided that this is driven to rotate about its longitudinal axis during the manufacturing process.
- the machining tool can have on its outer periphery a toothing or grain or at least a roughness, which lead to a rasp-like removal of the model body.
- a strand-shaped machining tool can also vibrate during the manufacturing process or move in an oscillating manner in the direction of its longitudinal axis.
- the machining tool performs a saw-like oscillating movement for ablation of material of the model body.
- the stroke of this oscillatory movement can vary between fractions of millimeters and a few millimeters.
- outer dimensions of the model body and / or dimensions of the cavity vary along the L Lucassach se.
- the model body or its outer dimensions can taper in the direction of the longitudinal axis.
- the outer dimensions may alternatively or additionally have a variable geometry along the longitudinal axis.
- the model body may have a rectangular or a round base.
- the outer dimensions of the model body may form a polyhedron, in particular a cuboid or a truncated pyramid, a cylinder or a truncated cone.
- the edges or at least some of the edges - especially those edges that extend from the top to the bottom extend - be rounded.
- the cavity may, as mentioned, alternatively or in addition to the outer dimensions along the longitudinal axis variie ren, for example, taper or change its geometric shape.
- the geometric shape of the inner cavity may coincide with the outer shape of the model body (for example both may be cylindrical or both conical or both parallelepiped or both pyramidal) or may deviate therefrom (eg a cylindrical recess may be provided in a cuboid model body or vice versa )
- the model body is suspended in the production of the recess by being fixed in an upper region.
- the recess can then be introduced, for example, from bottom to top.
- that with the introduction of the recess is gradually pulled away from the rest of Modellkör by severed strand down.
- an unwanted reconnection of the strand with the rest of the model body or an overlying strand section can be avoided.
- This may be particularly useful if the introduction of the recess is made with a hot machining tool and a risk of reconnecting is given due to melting of the strand when the separated strand and the rest of the model body touch.
- a receiving plate which moves in rotation and / or translationally.
- the plate can absorb the detached strand, which is pulled under deformation of the model body of the gravity force down and limit the deformation of the model body in this way.
- a groove is introduced into the model body, which extends in the model body wall along the inner side or the outer side orthogonal to the longitudinal axis or extending from the recess in the direction of the longitudinal axis.
- the processing device can have a groove cutter for this purpose.
- the groove cutter may be a processing tool in the sense of this application, which extends only partially through the model body wall in the radial direction.
- the groove cutter can start from the machining tion tool in the direction of the longitudinal axis extend for the introduction of a groove which extends in the direction of the longitudinal axis.
- the groove cutter may alternatively or additionally be connected as a separate processing tool via a second arm with the shaft of the processing device, in particular for providing a groove on the inside of the Modellkör perwand.
- the slot cutter may alternatively or additionally, to allow insertion of a groove on the outside of the model body wall, accordingly be arranged outboard, for example by being attached via a connection piece on the same arm as the machining tool.
- edges of the strand can be rounded and / or functional contours introduced, for example by a correspondingly configured machining tool.
- the functional contour may, for example, one or more cooling flags and / or one or more
- Positioning aids and / or one or more assembly aids and / or one or more cooling channels comprises.
- a depression can be made on one or more sides of the strand - in particular in the form of the above-mentioned groove - and the depression is subsequently closed, in particular by compressing adjacent turns, which is appropriate, for example, when the depression is at one end Top and / or a bottom of the strand is provided.
- Model bodies corresponding cam tracks are selected so that, for example, results in a constant distance of the point in progress to the center.
- said second relative movement but can also be a certain course of a groove or a depth of a groove (both rotationally symmetric as well as not
- rotationally symmetrical bodies are controlled or varied.
- the invention relates, in addition to a method of the type described above, also to a processing device for a helical casting model.
- the object of the invention is achieved in such a posessvor direction by a machining tool for generating a recess in a model body and a first drive device for rotating a model body and / or a machining tool zeugs relative to each other about an axis parallel to the longitudinal axis of the model body or with this is identical, and a second Antriebsvor direction for translational drive of the model body and / or the machining tool relative to each other in a direction parallel to the longitudinal axis of the model body direction.
- the desired shape can be given in a coordinated movement by the first and the second drive device of the recess produced by the machining tool in the model body.
- the drive devices are usually of an electromechanical nature, that is, for example, formed as a rotary motor or as a linear motor.
- any type of electro-magnetic or electro-mechanical oscillator can be used as a drive.
- the machining tool is set up to produce one or more recesses in the model body, in particular to machine or erode the model body or to process it by local melting.
- the machining device advantageously provides a control device which controls the first drive device and the second drive device in a coordinated manner.
- machining tool If the machining tool is operated in the manner of a hot wire, this requires a heating device for the machining tool.
- connection elements are in the produced coil / winding / spring fasteners or connection elements provided, they may already be provided in their geometry in the starting material, are introduced by the machining movement in the model, or attached by a subsequent joining of separa th elements. These areas may deviate from the shape of the winding and be specially designed for screwing, crimping, crimping, soldering or welding, as well as a connection element for example, the supply and removal of a cooling medium.
- FIG. 4 shows a detail from FIG. 3 in a section indicated there
- 5 shows an embodiment of a machining tool
- 6 shows another form of a processing device
- Fig. 7 shows a suspended model body
- FIGS. 8a-8c an introduction of grooves in model body.
- Figure la shows a helical casting model 1, which consists of a hollow cylinder with an inner cavity 3, wherein in the cylinder wall / model body wall 4, a helical recess 16 has been introduced.
- the intervening between the individual courses of the helical circumferential recess 16 from parts of the cylinder wall 4 form a helical body that can be poured as a casting model in the lost-mold process by a metal casting. This is in a subsequent casting a metallic bobbin or a coil spring or coil spring produced.
- FIG. 1a At the lower right of FIG. 1a is shown a section of the strand forming the helix.
- a cross section is shown which is quadratic: in the direction of the vertical arrows 100, the extent of the cross section in the direction of the longitudinal axis 2 is shown (axially) and in the direction of the horizontal arrows 101 the radial extent of the cross section relative to the axis 2.
- the longitudinal axis of the casting model 1 and of the model body 1 'on which it is based is designated 2 in the figures.
- a helical casting model 1 is shown with a helical recess 16, wherein the underlying model body, in which the recess 16 is introduced, is cuboidal and has a cuboid-shaped cavity 3.
- the edges of the model body can be rounded off optio nally.
- the outer dimensions of the model body and the dimensions of the cavity 3 are constant along the longitudinal axis 2 in the embodiment shown. In this case, in other embodiments, both dimen solutions or only one of them vary along the longitudinal axis 2.
- Figure lc shows an alternative embodiment of the helical casting model 1, wherein the casting model 1 and the underlying model body a Has square base and tapers in the direction of the longitudinal axis 2 upwards, so that a truncated pyramid is formed.
- the cavity also has a square base and tapers upwards, so also follows the shape of a truncated pyramid.
- the cavity 3 can be tapered to the same extent as the outer dimen conditions, so that a wall thickness of the model body wall 4 is kept constant. Cavity and external dimensions can also vary differently, so that a wall thickness increases or decreases upwards.
- the shape and thickness of the formed strand can vary in the radial direction.
- FIG. 1 d shows by way of example a side view of a casting model 1 with a recess 16, wherein the casting model 1 has a non-tapered shape along the longitudinal axis.
- the casting model 1 may be a cylinder with a round or elliptical base surface or a rectangular or square base.
- a possible course of the recess 16 is indicated in the figure ld, wherein on the side shown a slope of the recess 16 varies.
- the shape and the thickness of the formed strand can vary in the direction of the longitudinal axis 2.
- Figure le shows a side view of a casting model 1 with recess 16, wherein the underlying model body, in contrast to the model body of Figure ld tapers upwards.
- the underlying model body in contrast to the model body of Figure ld tapers upwards.
- it can therefore be a polyhedron, in particular a truncated pyramid, or a truncated cone.
- the pitch 16 of the recess varies along the longitudinal axis 2.
- the thickness of the formed strand in the direction of the longitudinal axis 2 as in the case of Figure ld, by the variable slope of the Ausneh determination 16 is varied.
- the thickness of the strand in the direction of the longitudinal axis 2 may be varied so that a cross section of the strand is constant, when a thickness of the strand in the radial direction is changed accordingly.
- FIG. 2 a section of a model body 1 'is shown in perspective, wherein, as in FIG. 1, the longitudinal axis is represented by 2, the cavity by 3 and the model body wall / cylinder wall is denoted by 4.
- a processing device with a processing tool 5, which is pivotable about the longitudinal axis 2 in a rotational movement, which is indicated by the arrow 6.
- the machining tool 5 is attached to an arm 17, which in turn is fastened to a shaft 18 which can be driven in rotation.
- the shaft 18 can be driven by means of the rotary drive 11.
- a not shown in Figure 2 second drive vorgese hen, which moves the machining tool 5 in the direction of arrow 7 in translation.
- a further drive may be provided which causes an oscillating movement of the machining tool 5 in the direction of its longitudinal axis 10, wherein the movement is indicated schematically by the double arrow 8 is.
- the machining tool 5 can be realized, for example, by a flat saw blade or a strand-shaped rasp body and a round saw blade in cross-section. However, it can, as shown in Figure 5, also have a circular saw blade 9, which is separately driven.
- the machining tool 5 is designed such that it can remove the material of the model body 1 'in order to introduce the recess 16 into the model body.
- the machining tool 5 in principle except a machining and an eroding machining union made union or the model body 1 'melt, as explained below.
- the processing device is shown in more detail in perspective view.
- the model body to be machined 1 ' is omitted for clarity, but its longitudinal axis 2 is recorded, which coincides with the longitudinal axis of the shaft 18.
- the shaft 18 is mounted in a telescopic tube 18 'and driven together with the telescopic tube 18' or separately from this by a rotary drive 11 in the direction of the arrow 6 in the context of a rotational movement.
- the shaft 18 within the telescopic tube 18 'in the direction of arrow 7 can be advanced in translation, with a second drive 12 for driving the shaft 18 or another telescopic tube, in which the shaft 18 can slide, is provided in the direction of the arrow 7.
- the drive movements 6, 7 are coordinated and controlled by a control device 13, such that, for example, with simultaneous rotational movement and feed movement by the machining tool 5 is a regular helical shape fürlau fen.
- the ratio of the speeds of the drives 11, 12 can also be changed during the movement, so that, for example, the pitch of the helix can be changed abruptly or steadily.
- one of the movements can be temporarily suspended, so that other than regular helix shapes can be generated.
- the function of the linear drive 12, the second drive, is shown in somewhat more detail in FIG. It is shown there that within the second drive 12 to a gear 12 'is rotatably mounted and driven, which engages in an integrated shaft in the shaft 18 or a holding tube, which supports the shaft 18, integrated rack and thus the shaft 18 within the Telescope tube 18 'drives linearly.
- the drive of the gear 12 ' is usually accomplished by an electric motor, which is electrically controllable by means of the control device 13.
- the drive 15 On the shaft 18, an arm 17 is fixed, the drive 15 carries an oscillating linear.
- the continuation 17 'of the arm 17 is oscillated in the direction of the double arrow 18 along the axis 10 of the arm 17 moves.
- the machining tool 5 in the form of a rasp, which is arranged at the end of the arm 17, thereby performs a saw-like movement for the removal of material of the model body wall.
- FIG. 6 shows a modified concept of the machining device, in which a shaft 18 can be driven in rotation in the direction of the arrow 6 within a telescopic tube 18 'by means of a rotary drive 11 and in which the shaft 18 can also be driven by means of a linear drive not shown in detail in FIG in the direction of arrow 7 is drivable.
- the machining tool 5 ' is formed as a wire, which is stretched between a heater 14 and a holder 17 attached to the arm 17.
- the heating wire 5 ' By heating the heating wire 5 'by means of the heater 14 is the Heating wire brought to a temperature above the melting point of the material of the model body, so that the heating wire can be used for hot cutting and thus introduces a recess 16 in the model body.
- the heating device 14 may, for example, be designed as a current source which generates a heating current through the heating wire 5 '/ the machining tool 5' in order to bring it to the required temperature.
- FIG. 7 illustrates a method in which the model body is suspended when the recess 16 is produced. He is thereby secured in an upper region to a fastening device 22 and held by the fastening generating device 22. The recess 16 is thereby introduced from bottom to top, in the direction of the arrow shown in the figure.
- a machining tool is not shown in FIG. 7. It can for example also be anchored in a suspended manner above the model body 1 ', but it can also stand on one foot.
- the downwards acting weight g ensures that the gradually emerging strand is pulled away downwards. As a result, an unwanted reconnection of the strand with the rest of the model body or an overlying strand section can be avoided.
- This configuration can be used, for example, in connection with a hot processing tool, if there is a risk of reconnection due to a melting of the strand. Even with other editing tools, the hanging storage of the model body 1 'may be provided.
- the severed hanging down strand can also be absorbed by a receiving plate, which - if the model body is moved - is moved with the model body.
- Figures 8a to 8c show possible embodiments of theitiesvorrich device with Nutschneider 5 "for introducing a groove 16 '.
- FIG. 8a shows a groove cutter 5 ", which is arranged on the machining tool 5, 5 'and extends therefrom in the direction of the longitudinal axis, so that a groove 16' can be produced which extends from the recess 16 in the direction of the longitudinal axis 2 extends.
- the machining tool 5, 5 ' may, for example, be arranged to rotate together with the slot cutter 5 "arranged thereon about the longitudinal axis 10 of the machining tool., however, it may also be designed as a non-rotating blade In the latter case, if it is not a is about the axis 10 rotating arrangement, but for example, a cutting, about hot cutting arrangement, a groove can be produced only at the top or only at the bottom of the strand.
- the machining tool shown can also be provided in addition to a machining tool without slot cutter and arranged in the direction of the longitudinal axis of this spaced on the shaft 18, so that a first recess 16 with groove 16 'and a further recess 16 without a groove - as in connection with the previous figures be written - can be produced. Then, in the case of the ratio of feed rate and rotational speed, it is typically necessary to ensure that the recesses have a pitch which is dimensioned such that the two recesses do not collide.
- Figures 8b, 8c show Nutschneider 5 ", with the help of which, together with the introduction of the recess 16 a groove 16 'in the model body 1' can bring in the model body wall, starting from the inner side or the outer side orthogonal to the longitudinal axis of the second extends
- the slot cutter 5 may be formed, for example, as a knife, in particular as a heated knife, or as a circular saw blade. Also in the embodiments of FIGS. 8b and 8c, care is taken in the ratio of feed rate (along arrow 7) and rotational speed (along arrow 6) to ensure that for the recess 16 and the groove 16 'one pitch is achieved in each case is that groove 16 'and recess 16 do not meet. It can thus be achieved that the strand along the turns on the inside ( Figure 8b) or on the outside ( Figure 8c) has a groove.
- FIGS. 8a, 8b and 8c can be combined with one another as desired.
- strands can be produced which have one or more grooves on one or more sides.
- the dimensions or position of the grooves 16 ' which are introduced by means of the devices of Figures 8a to 8c, are relative to the shaft 18 of the processing device fixable. In particular, their radial distance to the shaft 18 through the arm 17 and the second arm 17 'and the connec tion piece 21 may be fixed or fixable.
- positioning the slot cutter typically the dimensions of the model body are taken into account, so that the groove is produced at the desired location with the gewünsch th depth.
- the use of the slot cutter is possible, even if the movement of the machining tool is limited to rotation and relative movement along the longitudinal axis.
- the groove cutter of Figure 8a is also used in other model bodies with sufficient wall thickness.
- a second relative movement between the machining tool and model body which is directed orthogonal to the longitudinal axis, wherein the rotational movement and / or the relative movement along the longitudinal axis of the second relative movement are superimposed at least during a portion of the second relative movement and / or wherein the rotational movement and / or the relative movement along the longitudinal axis during the second Relative movement, at least during a part of the second Relativbewe movement are interrupted.
- corresponding curved paths can be selected so that, for example, there is a constant distance between the point being processed and the center.
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Abstract
Description
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Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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DE102018205585.8A DE102018205585A1 (de) | 2018-04-12 | 2018-04-12 | Verfahren zur Herstellung eines wendelförmigen Gießmodells |
PCT/EP2019/059358 WO2019197586A1 (de) | 2018-04-12 | 2019-04-11 | Verfahren zur herstellung eines wendelförmigen giessmodells |
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EP3774115A1 true EP3774115A1 (de) | 2021-02-17 |
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ID=66251745
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EP19719195.0A Pending EP3774115A1 (de) | 2018-04-12 | 2019-04-11 | Verfahren zur herstellung eines wendelförmigen giessmodells |
Country Status (5)
Country | Link |
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US (1) | US20210023769A1 (de) |
EP (1) | EP3774115A1 (de) |
CN (1) | CN112020401B (de) |
DE (1) | DE102018205585A1 (de) |
WO (1) | WO2019197586A1 (de) |
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WO2024123408A1 (en) * | 2022-12-09 | 2024-06-13 | Lifoam Industries, Llc | Lost foam and sand casting with polylactic acid-based foam articles |
Family Cites Families (25)
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US141347A (en) * | 1873-07-29 | David heer | ||
US3466743A (en) * | 1965-07-02 | 1969-09-16 | Gen Electric | Spiral coil comprising a tubular blank with parallel,rectilinear cuts therein |
US3564188A (en) * | 1969-05-07 | 1971-02-16 | Hexcel Corp | Electric discharge method of cutting suspended metal work pieces |
US3915210A (en) * | 1975-02-13 | 1975-10-28 | Vermont American Corp | Device for employing a radial arm saw to cut a spiralled groove in a workpiece |
US4413540A (en) * | 1981-12-18 | 1983-11-08 | Mobay Chemical Corporation | Foam peeling process and apparatus |
JPH04171110A (ja) * | 1990-10-31 | 1992-06-18 | Toshiba Corp | コイル形状物の製造方法 |
GB2255735B (en) * | 1991-04-23 | 1994-08-24 | Honda Motor Co Ltd | Method of manufacturing a lost foam pattern for use in full-mold casting |
US5893204A (en) * | 1996-11-12 | 1999-04-13 | Dresser Industries, Inc. | Production process for casting steel-bodied bits |
CN1244441C (zh) * | 2003-07-17 | 2006-03-08 | 西安交通大学 | 聚苯乙烯泡沫塑料模型的快速成型方法及其数控加工设备 |
JP2006297513A (ja) * | 2005-04-18 | 2006-11-02 | Fuji Photo Film Co Ltd | 溝付き形成体の製造方法 |
US7579550B2 (en) * | 2006-03-31 | 2009-08-25 | Boston Scientific Scimed, Inc. | Flexible device shaft with angled spiral wrap |
JP4837448B2 (ja) * | 2006-06-14 | 2011-12-14 | 東芝機械株式会社 | 精密ロール旋盤 |
JP4870535B2 (ja) * | 2006-11-30 | 2012-02-08 | メイラ株式会社 | インサート用部品、樹脂成形体並びに樹脂成形体の製造方法 |
CN201371296Y (zh) * | 2009-01-16 | 2009-12-30 | 华中科技大学 | 消失模线切割数控加工成形机 |
CN101474803B (zh) * | 2009-01-16 | 2012-06-13 | 华中科技大学 | 消失模线切割数控加工成形机 |
DE102010011508B4 (de) * | 2010-03-15 | 2015-12-10 | Ewag Ag | Verfahren zur Herstellung zumindest einer Spannut und zumindest einer Schneidkante und Laserbearbeitungsvorrichtung |
DE102011110044B4 (de) * | 2011-08-11 | 2013-11-28 | Ferroll Gmbh | Verfahren zum Herstellen einer Zylindereinheit, Schälwerkzeug und Drehmaschine |
US20210178460A1 (en) * | 2013-06-28 | 2021-06-17 | Danieli & C. Officine Meccaniche S.P.A. | Crystallizer for continuous casting and method for its production |
JP6044470B2 (ja) * | 2013-06-28 | 2016-12-14 | アイシン・エィ・ダブリュ株式会社 | コイル鋳造装置、コイル鋳造方法、及び金型 |
US20160158964A1 (en) * | 2013-07-09 | 2016-06-09 | United Technologies Corporation | Ceramic-encapsulated thermopolymer pattern or support with metallic plating |
KR101772047B1 (ko) * | 2015-10-02 | 2017-08-29 | 한국생산기술연구원 | 코일유닛의 제조방법 |
KR102176813B1 (ko) * | 2017-09-29 | 2020-11-11 | 한국생산기술연구원 | 코일유닛의 제조방법 |
DE102018205587A1 (de) * | 2018-04-12 | 2019-10-17 | Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. | Verfahren zur Herstellung eines gewendelten elektrisch leitenden Körpers |
DE102018205588A1 (de) * | 2018-04-12 | 2019-10-17 | Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. | Verfahren zur Herstellung eines gewendelten Körpers |
JP7225484B2 (ja) * | 2018-06-04 | 2023-02-21 | 福井県 | 電気機器用コイルの製造方法 |
-
2018
- 2018-04-12 DE DE102018205585.8A patent/DE102018205585A1/de active Pending
-
2019
- 2019-04-11 EP EP19719195.0A patent/EP3774115A1/de active Pending
- 2019-04-11 CN CN201980025351.9A patent/CN112020401B/zh active Active
- 2019-04-11 US US17/045,966 patent/US20210023769A1/en active Pending
- 2019-04-11 WO PCT/EP2019/059358 patent/WO2019197586A1/de unknown
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US20210023769A1 (en) | 2021-01-28 |
DE102018205585A1 (de) | 2019-10-17 |
CN112020401A (zh) | 2020-12-01 |
WO2019197586A1 (de) | 2019-10-17 |
CN112020401B (zh) | 2023-04-04 |
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