EP0268656A1 - Verfahren zur herstellung von formen und formteilen für gie ereizwecke, insbesondere zur herstellung von kernen, und einrichtung zur durchführung des verfahrens. - Google Patents
Verfahren zur herstellung von formen und formteilen für gie ereizwecke, insbesondere zur herstellung von kernen, und einrichtung zur durchführung des verfahrens.Info
- Publication number
- EP0268656A1 EP0268656A1 EP87903870A EP87903870A EP0268656A1 EP 0268656 A1 EP0268656 A1 EP 0268656A1 EP 87903870 A EP87903870 A EP 87903870A EP 87903870 A EP87903870 A EP 87903870A EP 0268656 A1 EP0268656 A1 EP 0268656A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- core
- box
- partial
- joining
- parts
- 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
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/10—Cores; Manufacture or installation of cores
- B22C9/103—Multipart cores
Definitions
- the invention relates to a process for the production of molds and molded parts for foundry purposes, in particular for the production of cores which are composed of at least two core parts and are firmly connected to one another, the individual core parts each in a core box consisting of at least two partial boxes for to be formed.
- core in the sense of this application is to be understood as meaning once-assembled molded parts which are placed in a casting mold and solve cavities, undercuts and similar problem areas of the casting mold design on the finished casting, that is to say foundry cores in the conventional sense.
- the term in the sense of the present invention also includes the casting mold itself, which is composed of several parts, but which consists of the same Chen molding material and by the same process as foundry cores; depending on the shape of the casting to be created, both the inner wall and / or the outer wall of the casting can be delimited by the assembled “core parts”.
- This method is very time-consuming and also has the disadvantage that the placing and resuming of the individual core parts between the individual production stages exposes them to unnecessary stresses which lead to breakouts or also to abrasion, which leads to dimensional deviations and misalignments the core parts can lead to each other, columns or the like.
- the result of this is that the castings produced with such cores have to be reworked with a considerable amount of work, in particular burrs arising from offset or gaps on the casting, which burrs have to be removed at least in the areas which are involved in the subsequent mechanical processing of the casting can no longer be edited.
- burrs arising from offset or gaps on the casting
- these areas are sometimes very difficult to access, so that the removal of casting burrs is very labor intensive.
- the invention is based on the object, the method for the production of molds and molded parts for foundry purposes, in particular for the production of cores, which are composed of several core parts to be firmly connected to one another, the individual core parts each in a core box consisting of at least two partial boxes for are formed, the core box being opened in such a way that the core part remains connected to a partial box after the molding process of the individual core parts has been completed, then the core parts to be joined are joined together by a defined relative movement of the partial boxes and each time after the joining together first from the one partial box solved and then the assembled core is ejected from the other sub-box, to improve so that more complicated cores composed of several core parts can be machined and put together, as well as a higher dimension and better shape accuracy is achieved.
- the molding process for the individual core parts is carried out in molding machines which operate independently of one another and in that the part box (base part box) a core part defined as a basic core part remains connected to the latter as a support and centering element and undergoes all subsequent joining operations, all other core parts being built up on the base core part by assembly and then the complete core is ejected from the base part box serving as a support element.
- the part box base part box
- a core part defined as a basic core part remains connected to the latter as a support and centering element and undergoes all subsequent joining operations, all other core parts being built up on the base core part by assembly and then the complete core is ejected from the base part box serving as a support element.
- the particular advantage of the method according to the invention is that after the molding process has been completed, the individual core parts are not completely detached from their core boxes, but remain connected to a partial box and are joined together by relative movement of the partial boxes holding them. Since the geometrical assignment required for the joining and the resulting relative movement of the core parts to be joined to one another takes place through the corresponding alignment and movement of the part boxes to one another, the joining process can be carried out with great precision, since the core parts held in their part box have a spatial relationship Alignment that would never be achieved after a complete molding.
- cores which, as explained at the outset, form a casting mold and are generally composed of more than two core parts, so that several joining operations have to be carried out in succession, it is advantageously used that a defined and so that reproducible geometric alignment can be maintained so that the individual core parts can be assembled with great precision.
- the mutually associated contact surfaces of the individual core parts are not subject to any wear during the transport processes, so that they lie precisely with one another both with their surfaces and with their edges, so that neither gaps nor offset edges can form.
- Such cores composed of a plurality of core parts can also be firmly connected to one another in a wide variety of ways, depending on the geometrical shape of the core, it being possible to use the most varied of connection methods.
- the method according to the invention has the advantage that the conical pins are not exposed to abrasion on one side due to the precisely defined joining movement, but the surfaces forming the frictional connection practically only immediately before reaching the core parts against each other touch and be pressed against each other.
- the invention further relates to a device for carrying out the method, with at least two core molding machines for producing core parts, each of which has a core box composed of at least two partial boxes.
- the device is designed according to the invention in such a way that at least one partial box (basic partial box) of at least one core molding machine with a displacement device in
- connection is established that connects the core molding machine to at least one joining station, that the joining station is provided with a centering device for the base part box to be moved and an ejection device is provided for the core part to be joined to the base core part.
- the centering device for the base part box With the help of the centering device for the base part box, this is given a precisely defined position in space, in which it can then be brought together with the other part box, which contains the core part to be added.
- the joining movement can consist in a pure translational movement, so that the joining device can essentially be formed by a pneumatic or a hydraulic cylinder.
- the joining device is to be designed in such a way that a superposition of at least two translational movements, but possibly also the superimposition of translational movements and rotary movements, can be carried out in order to insert the core part into the core part held in the base part box.
- a plurality of basic part boxes are then to be provided in the device, which are to be guided in the circuit between the associated molding machine and the joining station or stations, so that the individual core molding machines of the device can work largely in synchronism.
- the joining device has holding and centering elements both for the base part box and for the part box with the core part to be added ⁇ 'which engage in the relative movement of the two part boxes and are dimensioned such that the centering elements are together be engaged before the core parts are assembled.
- the holding and centering elements can be part of the joining device and center both part boxes relative to one another before the joining movement begins.
- the holding and centering elements are arranged directly on the partial boxes, so that the partial boxes to be brought together separate themselves independently of the structure of the joining device. This allows the basic part box to be moved freely. '
- the joining device is formed in each case by the subsequent core molding machine, the open, unfilled part box serving in each case as a receptacle for the base part box.
- the base part box After loosening the attached core part from its part box, for example by means of an ejector, the base part box is then over again the normal opening movement is lowered and can then be resumed by the moving device and freely transported to the next core molding machine which acts as a joining station.
- the base part box on its mold cavity side and on its side facing away from the mold cavity and in each case the core box halves for the core part to be added to the core molding machine serving as a joining device each have centering elements which correspond to one another on the mold cavity side.
- the partial boxes center each other, so that the precision of the joining device is not the only decisive factor, be it a separate joining device or a core molding machine acting as a joining device.
- the centering can be checked and reworked each time the partial boxes are revised. It is advantageous here if the centering elements are designed as centering pins on one side of the box and as recesses on the other side of the box.
- the centering pin is held longitudinally displaceably in the partial box against a compression spring element and is designed to be tapered at its free end. This ensures that when the partial boxes are brought together, they are first centered against each other and only then does the partial box move relative to one another. This also makes it possible to design the guide for the centering pin with a high degree of fit, since because of the previous centering there is no longer any risk of canting, especially since the movement is essentially carried out by the core molding machine, which is designed for precise guidance of the part boxes is.
- the device is designed in such a way that the parting plane of the mold boxes of the individual core molding machines is oriented essentially horizontally, the base part box also being in this
- the longitudinally displaceable centering pins are each arranged facing downward on the part boxes of the core molding machine and on the base part box. This avoids that detached molding material particles get into the pin guides. It is expedient here if the recess has an opening that extends through to the outside in its base region. This ensures that no mold material particles falling away from the core parts can collect in the upwardly open recesses.
- Fig. 1 shows the process flow in the form of a
- the procedure is first explained in a simplified manner using the example of a two-part core which, for a casting with internal undercuts, has to be composed of two core parts, for example. Accordingly, the two necessary core parts for such a core are manufactured with the help of two core molding machines 1 and 2, which are shown in the flow diagram in accordance with FIG. Fig. 1 are indicated only schematically by their core boxes 3 and 4.
- the core molding machines are of conventional design and work, for example, in a core molding process with activation of the binder by introducing a catalytically active gas into the closed mold filled with molding material, for example core sand.
- the core boxes 3 and 4 are opened, ie the partial boxes 3 "and 4" are lifted off so that the core parts 5 and 6 each remain connected to the partial boxes 3 'and 4 1 by their adhesion.
- the sub-box 3 is moved into a joining station 8 with the aid of a displacement device 7, which is only illustrated in the flow diagram by the strongly drawn arrow process and fixed and centered there with fixing devices, not shown, for example hydraulically or pneumatically actuated clamping ratchets. It practically depends on the shape of the core part, the orientation of its dividing line and its core marks, whether the centering and fixing in the joining station 8 takes place in a horizontal orientation, as shown, or in another orientation, for example inclined or vertical.
- the sub-box 4 'with the core part 6 is also moved via a displacement device 9 to the joining station 8 in such a way that the sub-box 4' is positioned exactly vertically above the sub-box 3 'in the joining station.
- the sub-box 4 'with the core part 6 is then lowered onto the sub-box 3' with the core part 5 and in this case both core parts via a joining device 10, which can be arranged in a stationary manner or can also be connected to the movable part of the displacement device 9 put together '. Since after the joining operation the assembled core is continued with the partial box 3 ', this forms the basic partial box.
- the now inserted core part 6 is detached from its part box 4 'via an ejection mechanism of a known type, and the part box 4 1 is raised again and guided back into the core molding machine 2 via the displacement device 9.
- the fixed connection between the assembled core parts can now be made by frictional engagement, for example by conical pins on one core part and correspondingly assigned conical recesses on the other core part, so that with the joining movement only by pressing n the pins into the recesses both core parts firmly are connected to each other.
- the fully assembled core can now be ejected from the base part box 3 'and transported away immediately after the part box 4' has been lifted off by means of an ejection mechanism of a known type.
- the base part box 3 ′ can be moved back into the core molding machine 1 via the moving device 7 and the next molding process can take place.
- the two core parts are firmly connected to one another in the usual way with the aid of special screws.
- the screwing can be carried out by hand with a pressure run or with electric screwdrivers in the joining station 8 before ejection.
- a larger number of base part boxes 3 ' must be provided in a workflow in which a base part box 3' passes through several stations before the completely assembled core is ejected cycle through the facility.
- the structure and sequence of the individual work cycles of the device explained with reference to FIG. 1 is now essentially dependent on the size and shape of the core parts to be joined together. It can easily be seen that here, for example, several core molding machines can be arranged in a star or beam shape around the joining station 8 if, for example, more than two core parts are to be joined together.
- connection methods can be used, for example two core parts can be connected to one another by gluing or friction locking and then the entire package can be screwed together after adding a third or fourth core part.
- FIG. 2 shows in the form of a flow diagram a process sequence modified from FIG. 1 for a core composed of three core parts. It can be seen from the following description that this process sequence is particularly suitable for the precise assembly of a large number of core parts to form a core package. For the sake of simplicity, however, the procedure is only described for the example of a core package composed of three core parts.
- the device has three core molding machines I, II and III, in which the core parts A, B and C are formed.
- the core boxes are each formed by the partial boxes 3 ', 3 "of the core molding machine I and B4', B4" as well as C4 'and C4 "of the core molding machine II and III.
- the core part A forms the basic core part, so that the partial box 3' dement ⁇ speaking forms the base part box, which is detachably connected to the core molding machine and can be moved within the device via a traversing device, not shown, shown here by the strongly drawn arrows.
- the partial boxes ' B4 "and C4" are each fixed with their associated Core molding machine II or III connected.
- the base part box 3 ' is picked up by the displacement device and moved to the core molding machine II.
- the core part B is already in the core molding machine II shaped so that the core box opens and the sub-box B4 "is moved downwards so far that the base part box 3 'can move into the core box 4 thus opened.
- the core part B to be added is held by the sub-box B4' the core box B4 is closed, so that the base part box 3 'located above it is centered by the part box B4 "and is guided with its core part A against the core part B in the part box B4 * until the core part B and the core part A are assembled in the manner described above.
- the core part B is then released from the part box B4 'by means of an ejection mechanism in the part box B4', which is not shown here, so that when the part box B4 "is lowered, the now assembled part package can be moved back down to the travel position the base part box 3 'is moved by the moving device into the now opened part box C4' of the core molding machine III, in which the core package is completed in the same way by adding the core part C in the manner described above
- the completely assembled core package is fed to an ejector 15 and detached from the base part box 3 'and fed to the casting station.
- the now empty base part box 3' is led back to the core molding machine I via the moving device.
- the method and thus also the devices described on the basis of the flow diagram according to FIGS. 1 and 2 can be modified in such a way that, for example, in the case of a core composed of four parts, each in a joining operation as described in FIG. 1, two Core parts are put together and then one of the part cores put together from two core parts is then moved in the same way with the part box previously used as the base part box into a final assembly and is joined there with the base part box of the other core part package via this base part box.
- each core part can be manipulated in a targeted manner via the part shape connected to it, intermediate operations can also be provided for individual part forms in this workflow. For example, zones or edges of the core that are particularly at risk during the casting process can be provided with a black coating by spraying or brushing. Due to the spatial assignment clearly defined via the connection with the partial shape, this process can also be carried out automatically.
- Fig. 3 shows a section as an application example of a rotationally symmetrical, bowl-shaped casting 17 with a plurality of undercuts.
- the mold required for this, including the cores, cannot be made from one piece, but rather must be assembled from four core parts.
- FIG. 4 The joining operation is now shown in FIG. 4 in the four individual steps a) to d).
- a device is used for the production as described with reference to FIG. 2, but here instead of three core molding machines a total of four core molding machines are used.
- the sectional view in FIG. 4 a) shows the production of the base core part 19 with the aid of a core shape which is divided into a lower part U1 and an upper part 01.
- the base core part 19 remains in the bottom mold U1, which at the same time represents the base part box, which serves for fixing and centering in all subsequent joining operations.
- the base part box U1 is now moved to the subsequent core molding machine II and geometrically precisely fixed there.
- the core part 19 is thus also geometrically precisely aligned in space.
- the base core part 19 is brought up to the core part 20 to be attached, which is connected to its partial shape 02, and joined together, the pin 22 of the core part 20 being inserted into the recess 21 in the core part 19.
- guide bolts 23 on the base part boxes U1 engage in the part box 02, so that regardless of any alignment errors in the closing movement of the core molding machine II, the two part boxes and thus the two core parts are inserted exactly one into the other.
- the core parts 24 and 25 are then inserted in steps c) and d) in the same way, the individual cores being connected to one another again by means of corresponding conical pins. Since the individual core parts must be firmly connected to one another to form the overall core, this can be done, for example, by means of an adhesive connection or a frictional connection in the area of the conical pins.
- the complete casting mold is then ejected from the base part box U1 via a not shown ejection device of conventional construction and can then be removed for the further manufacturing process.
- the base part box U1 is then, as in FIG. 2 shown, returned to the associated core molding machine I via a corresponding conveyor.
- the joining operation shown and described can also be carried out in such a way that the base part box U1 is opened once and all associated other part boxes 02, 03 and 04 are successively guided to a joining station. After each joining operation, the base part box U1 can also be carried forward by one cycle to a correspondingly multipart formed separate joining station, so that always several part cores are joined together at the same time.
- the example described with reference to FIGS. 3 and 4 shows that the production of complete casting molds, including the cores to be inserted, can actually be carried out fully automatically.
- the outer mold can now be produced from the same molding material used for producing the cores and by the same method. Since the actual core and the outer mold are produced from the same molding material and in the same process, that is to say with the same accuracy and the same strength properties, the outer mold and the core can now also be joined in accordance with the process according to the invention.
- the division of the core and the outer shape can be carried out in such a way that parts of the outer shape and parts of the core are alternately joined when joining in successive joining operations.
- the upper box B4 ' is provided on the mold cavity side with centering pins 26 which are held longitudinally displaceably * in the partial box B4' against a compression spring element 27.
- the guide of the centering pin 26 can be designed with a high-quality, play-free fit, since molded sand parts cannot get into the guide above.
- the free end 28 of the guide pin 26 is tapered.
- the movable base part box 3 ' is provided on its underside facing away from the mold trough in the same way with centering pins 26 which are longitudinally displaceable against a compression spring element 27 and which are likewise conical at their free end 28.
- the centering pins 26 of the base part box 3 ' can be made shorter, since the base part box 3' is only ever placed on the open, ie empty, lower part box B4 ".
- the centering pins 26 on the upper part box B4 ' must be made longer , since here the height of the base core part A and the height of the core part B to be added as well as a minimum free space for the centering movement described in more detail below must be available.
- the lower part box B4 ′′ and the base part box 3 1 are provided on the side of their recessed shape with conically tapering recesses 29, which are assigned to the conically tapering end 28 of the associated centering pins 26.
- the conically tapering recesses 29 are each in their bottom region with an outward provided through opening 30 so that molded sand particles falling into the recess 29 cannot accumulate in the recess and thus trouble-free operation is guaranteed over a long operating time.
- the base part box 3 'supplied via the moving device is now initially received by the lower part box B4 "which moves in the closing direction (arrow 31), the conical ends 28 of the centering pins 26 first engaging in the recesses 29 and the base part box 3' being exactly zen
- the centering pins 26 are pressed in against the force of the compression spring element 27 until the base part box 3 1 rests on the dividing surface of the part box B4 "and in the further course of the closing movement is lifted off the moving device and against the upper box B4 'is performed.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Molds, Cores, And Manufacturing Methods Thereof (AREA)
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AT87903870T ATE47542T1 (de) | 1986-06-04 | 1987-05-27 | Verfahren zur herstellung von formen und formteilen fuer gie ereizwecke, insbesondere zur herstellung von kernen, und einrichtung zur durchfuehrung des verfahrens. |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19863618703 DE3618703A1 (de) | 1986-06-04 | 1986-06-04 | Verfahren zur herstellung von kernen fuer giessereizwecke und einrichtung zur durchfuehrung des verfahrens |
DE3618703 | 1986-06-04 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0268656A1 true EP0268656A1 (de) | 1988-06-01 |
EP0268656B1 EP0268656B1 (de) | 1989-10-25 |
Family
ID=6302221
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP87903870A Expired EP0268656B1 (de) | 1986-06-04 | 1987-05-27 | Verfahren zur herstellung von formen und formteilen für gie ereizwecke, insbesondere zur herstellung von kernen, und einrichtung zur durchführung des verfahrens |
Country Status (5)
Country | Link |
---|---|
US (1) | US4809763A (de) |
EP (1) | EP0268656B1 (de) |
JP (1) | JPH074645B2 (de) |
DE (2) | DE3618703A1 (de) |
WO (1) | WO1987007543A1 (de) |
Families Citing this family (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE4006176A1 (de) * | 1990-02-28 | 1991-09-05 | Hottinger Adolf Masch | Verfahren und vorrichtung zum herstellen von kernen fuer giessereizwecke |
DE4211130A1 (de) * | 1992-04-03 | 1993-10-07 | Bruehl Aluminiumtechnik | Verfahren zum Gießen eines Kraftfahrzeugrades aus Metall sowie nach dem Verfahren hergestelltes Kraftfahrzeugrad |
JP2943674B2 (ja) * | 1994-12-26 | 1999-08-30 | トヨタ自動車株式会社 | 中子成形方法 |
DE19540023A1 (de) * | 1995-10-27 | 1997-04-30 | Bruehl Eisenwerk | Verfahren zum Einbringen von Kernen in eine Gießform |
US5785107A (en) * | 1995-12-29 | 1998-07-28 | Georg Fischer Disa, Inc. | Apparatus and method for producing multiple cores |
US5787957A (en) * | 1996-06-28 | 1998-08-04 | Georg Fischer Disa, Inc. | Apparatus and methods for injecting and gassing of sand |
DE19833598A1 (de) * | 1998-07-25 | 2000-02-24 | Mann & Hummel Filter | Werkzeug insbesondere zum Herstellen von Kernen |
US6527039B2 (en) * | 2001-06-11 | 2003-03-04 | General Motors Corporation | Casting of engine blocks |
DE102005039493A1 (de) * | 2005-08-18 | 2007-02-22 | Eisenwerk Brühl GmbH | Giesskernanordnung für ein Gusswerkstück |
DE102006017922A1 (de) * | 2006-04-18 | 2007-10-25 | Audi Ag | Formblock für den Serienguss von Werkstücken |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2624084A (en) * | 1948-10-21 | 1953-01-06 | John R Row | Mold and coremaking machine |
GB1057547A (en) * | 1964-06-19 | 1967-02-01 | Henry Wallwork And Company Ltd | Cored foundry moulds |
DE1253415B (de) * | 1965-08-04 | 1967-11-02 | Rheinstahl Eisenwerk Hilden Ag | Verfahren zum Herstellen zweiteiliger Hohlkerne nach dem Schiessverfahren mit Heisskernkaesten |
DE1558391B1 (de) * | 1967-05-05 | 1971-03-18 | Fritz Winter Ohg | Verfahren und vorrichtung zum setzen eines gruenkerns in eine giessform |
US4079774A (en) * | 1973-06-25 | 1978-03-21 | Dansk Industri Syndikat A/S | System for making sand molds each having associated therewith a core member |
US4278123A (en) * | 1979-03-12 | 1981-07-14 | Acme-Cleveland Corporation | Simplified foundry core making machine and method |
DE3200193A1 (de) * | 1982-01-07 | 1983-07-14 | Klöckner-Humboldt-Deutz AG, 5000 Köln | Verfahren zur herstellung eines hohlen giessereikerns |
-
1986
- 1986-06-04 DE DE19863618703 patent/DE3618703A1/de not_active Withdrawn
-
1987
- 1987-05-27 EP EP87903870A patent/EP0268656B1/de not_active Expired
- 1987-05-27 JP JP62503593A patent/JPH074645B2/ja not_active Expired - Lifetime
- 1987-05-27 WO PCT/EP1987/000277 patent/WO1987007543A1/de active IP Right Grant
- 1987-05-27 DE DE8787903870T patent/DE3760849D1/de not_active Expired
- 1987-05-27 US US07/162,404 patent/US4809763A/en not_active Expired - Lifetime
Non-Patent Citations (1)
Title |
---|
See references of WO8707543A1 * |
Also Published As
Publication number | Publication date |
---|---|
JPH074645B2 (ja) | 1995-01-25 |
JPH01500021A (ja) | 1989-01-12 |
US4809763A (en) | 1989-03-07 |
DE3618703A1 (de) | 1987-12-10 |
DE3760849D1 (en) | 1989-11-30 |
EP0268656B1 (de) | 1989-10-25 |
WO1987007543A1 (en) | 1987-12-17 |
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