Abstract:
An arrangement for the exchange of implements in foundry or mold casting  hines, in which the implement is moved from a changing station towards an implement receiving and work station, and there connected with the implement holder.

Description:
This application is a continuation of application Ser. No. 668,305, filed 11/5/84, now abandoned. 
    
    
     BACKGROUND OF THE INVENTION 
     1. Field of the Invention 
     The present invention relates to an arrangement for changing of molds in foundry or mold casting machines, in which the mold is moved from a changing station to a receiving and work station, and there connected with means for holding the mold. 
     2. Discussion of the Prior Art 
     Changing work tools or molds in foundry machines usually requires stationary or mobile hoisting tools, which are used to locate the mold in the operative position. This changing procedure is complex and frequently subject to accidents. Moreover, the molds which, as a rule, are multipart molds, are cleaned within the machine, and this is relatively difficult to do. 
     Also known in the art are arrangements in which the new and old molds are mounted on a rotatably supported mold holder, and these molds are transferred by swinging the new part into the machine and then into operation. This type of arrangement is disclosed in German Pat. No. 31 48 461. 
     For this purpose, a part of the new mold is arranged on a second mold holder of the machine, and then pivoted into the operative position. The disadvantages of this arrangement are that the actual exchange of the mold must be done, as heretofore, through external hoisting instruments or tools, with a corresponding danger of accidents, and a second mold holder is required, resulting in duplication of structural components. 
     SUMMARY OF THE INVENTION 
     Accordingly, an object of the present invention is to provide an arrangement for eliminating the above-mentioned disadvantages, in that complete tools or molds are positioned outside the actual work area of the machine, but in association with the machine, and are securely inserted into the machine and rapidly connected with the mold holder. The arrangement can be utilized in a reverse sequence for the removal of tools or implements. A particular object of this invention is to apply this principle to multi-part molds. 
     The invention facilitates the assembly of multi-part molds in the machine without adversely affecting operation of the machine. The individual parts of the mold can be brought together, from different storage magazine areas, into the changing station of the machine and assembled therein into the complete mold which can then be moved a short distance into the work area of the machine and there connected with the mold holder. A mold piece that is to be assembled can be moved a similarly short distance into the changing station and there assembled. When the mold piece is heated during operation, as is common in foundry machines, the mold can be deposited in the changing station, without any waiting period for the mold to cool, and thereafter disassembled. In a similar way, a new mold which is to be inserted into the machine, and which is heated during operation, can be pre-heated in the changing station and then assembled so that it is, after assembly, immediately ready for operation. 
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS 
     Reference may now be had to the following detailed description of an exemplary embodiment of the invention, taken in conjunction with the accompanying drawings; in which: 
     FIG. 1 is a generally schematic side elevational view of a foundry machine, specifically a core blasting and hardening automatic apparatus, with a horizontally divided mold; and 
     FIG. 2 is a plan view of the machine shown in FIG. 1 taken along the direction of arrow A of FIG. 1. 
    
    
     DETAILED DESCRIPTION 
     The invention relates to a machine including a movable core blasting unit 1, a movable hardening unit 2, and a clamping device 3. A changing station 4, including two loading stations 5 and 6, is located adjacent the above-described machine. A multi-part mold is located in the foundry machine, and this mold includes a blasting headplate 7, ejector plate 8, and a core box having upper portion 9 and lower portion 10. The blasting unit 1 and the hardening unit 2 are movable together along a slide carriage 20. 
     The mold parts 7, 8, 9 and 10 are the components of a mold which is assembled from these parts and used to form hardened molding cores, such as are utilized in the foundry or mold casting technology. 
     When the upper portion 9 and lower portion 10 of the core box, and the blasting headplate 7 are assembled together in the work area of the machine, below the blasting head of the blasting unit, sand can be introduced into the core box 9, 10 under pressure from the blasting unit. To do this, with particular reference to FIG. 1, the blasting unit 1 is moved from the position I into the position II, the lower portion 10 of the core box is raised in the direction of arrow A to a position below the upper portion of the core box, and the blasting headplate 7 is lowered onto the upper portion 9 of the core box. When a core is formed in the core box 9, 10, then the blasting unit and the hardening unit 2 are moved, through horizontal displacement of the slide carriage 20, so that the blasting unit is brought from the position II into the position I and the hardening unit 2 is moved from the position III into the position II. The blasting headplate 7 is thereby removed, together with the blasting unit, from the core box and brought from the position II into the position I. This same movement of the carriage brings hardening unit 2 into the position II; and the hardening unit, with the interposition of an ejector plate, is lowered onto the upper portion 9 of the core box to harden the previously produced core. The hardening of the cores is thus effected immediately after the formation thereof. 
     During this core formation, another mold piece 11, which is to be used during a subsequent production of a differently shaped core, can be assembled in the loading station 6 of the changing station 4, and the changing station may be provided with any suitable means to do this. This is done outside the machine work area which in essence is the mold holding and work station 21 of the machine. The mold 11 has basically the same construction as, but a shape different from, the shape of the work tool formed from components 8-10. 
     To change molds, the hardening unit 2 is moved from position II into position III, while the blasting unit 1 is concurrently moved from position I into position II. Thereafter, the lower portion 10 of the core box is moved vertically upwardly until it is below the upper portion 9 of the core box. After the blasting unit 1 is lowered and the blasting head plate 7 is released so that this headplate lies on the upper portion 9 of the core box, the blasting unit 1 is raised and returned into position I. The hardening unit 2 is now moved from position III to position II, lowered onto the blasting headplate 7 and released from the ejector plate 8. 
     Thereafter, the upper portion 9 of the core box is released from the upper frame 12 of the clamping device 3. During the subsequent lowering of the lower frame 13 in the &#34;z&#34; direction down to the level of the changing station 4, the mold components 10, 9, 8 and 7 form a unit and this work tool unit is then brought in the &#34;y&#34; direction into the open loading or processing station 5. 
     The thus occupied loading or processing stations 5 and 6 are thereupon moved together horizontally in the &#34;x&#34; direction in such a manner that the mold which has been removed from the machine is carried from the position V into the position IV, and the new mold 11 is carried from the position VI into the position V. 
     The mold 11, which is identical in construction with the removed mold 7 through 10, is mounted by initially moving the mold 11 in the &#34;y&#34; direction onto the implement holding and work station 21, and then into the clamping device 3. 
     Thereafter the following operating steps and movements are implemented: 
     The clamping device 3 is closed through the upward movement of the lower frame 13 to raise the new mold 11 to a position where the upper portion of the core box of the new mold can be connected to the upper frame 12 of the clamping device 3; 
     the hardening unit 2 is lowered and clamped to the ejector plate 8; 
     the upper portion 9 of the core box is connected with the upper frame 12; 
     the hardening unit 2, together with the ejector plate 8, is raised and moved into the position III; 
     the blasting unit 1 is moved from position I to II, lowered and then clamped together with the blasting headplate 7; 
     the blasting unit 1 is raised, and the clamping device 3 is opened by lowering the lower frame 13. 
     The mold unit change is thereby completed. The old mold can be disassembled at the loading or processing station 4, during the mounting of the new mold or during the production of cores with the new mold unit, and station 4 may be provided with any suitable means to disassemble the removed mode. 
     The above-described change of horizontally divided or separated mold units is also applicable to vertically divided molds by means of a corresponding clamping device. 
     Consequently, the invention discloses a novel arrangement for the automatic change and fastening of molds. Such an arrangement is particularly useful for example, in foundry machines employed in the production of casting molds, cores and ingot molded products. 
     The inventive arrangement significantly reduces the time needed to change molds. Moreover, with the present invention, it is possible to position the mold components outside the machine without disrupting the operating cycles thereof. The invention additionally reduces the danger of accidents since it is not necessary for personnel to reach into the machine during the transfer of the mold. 
     With this invention, molds or tools which must be maintained at an elevated working temperature during operation of the machine may be pre-heated, significantly reducing the heretofor necessary interruptions in the operating cycle of the machine during a mold transfer. Apparatus required to do this, such as thermoelements, control lines for switching functions and the like, may be automatically connected to the mold. 
     The arrangement of this invention provides the prerequisite condition for the preparation and the movement of molds towards and from the mold storage area by means of pregiven coding. 
     The paths of movement of the individual stations in the three directions x, y, z can be effected through usual means; for example, through electrical drive motors, chain drives and couplings, or through hydraulically or pneumatically actuated operating cylinders. The specific means utilized for this purpose, in themselves, are not essential to the invention. 
     The interconnection between the mold components 7, 8, 9 and 10 or, respectively, the applicable components of the new mold 11, on the one hand, and the machine components consisting of the blasting unit 1, the hardening unit 2 and the upper frame 12 and the lower frame 13 of the clamping device 3 which hold or pickup these components, is made by connecting means of the type that can be rapidly or quickly operated to connect elements together and to disconnect elements from each other, and such rapid operating connecting means are referred to herein as &#34;snap closures.&#34; Such connecting means are also known per se and are not described in detail, and the only importance of these closures is the manner in which they are utilized in this invention. For mold units that need them, snap closures are provided to connect the mold unit, which is to be inserted into the machine, to a suitable energy supply, such as an electric voltage source, and to disconnect the mold unit, which is to be removed from machine, from the energy source.