CA1080937A - Machine for producing casting mould parts - Google Patents
Machine for producing casting mould partsInfo
- Publication number
- CA1080937A CA1080937A CA270,817A CA270817A CA1080937A CA 1080937 A CA1080937 A CA 1080937A CA 270817 A CA270817 A CA 270817A CA 1080937 A CA1080937 A CA 1080937A
- Authority
- CA
- Canada
- Prior art keywords
- machine
- moulding
- box
- presser
- pin
- 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.)
- Expired
Links
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C15/00—Moulding machines characterised by the compacting mechanism; Accessories therefor
- B22C15/10—Compacting by jarring devices only
- B22C15/12—Compacting by jarring devices only involving mechanical gearings
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Casting Devices For Molds (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE:
A machine for producing casting mould parts, compris-ing a moulding table for supporting a moulding box, a compaction press for compacting mould-forming material in the moulding box and at least one pair of mutually oppositely acting presser means arranged to engage respectively opposite sides of a moulding box when supported on the moulding table and to react against respec-tive abutment members. The two abutment members for the or each pair of presser means being rigidly interconnected with each other, each presser means having a part which is movable in a plane pa-rallel to the plane of the surface of the moulding table inwardly and outwardly relatively to the respective abutment member for engagement with and disengagement from a moulding box when sup-ported on the moulding table.
A machine for producing casting mould parts, compris-ing a moulding table for supporting a moulding box, a compaction press for compacting mould-forming material in the moulding box and at least one pair of mutually oppositely acting presser means arranged to engage respectively opposite sides of a moulding box when supported on the moulding table and to react against respec-tive abutment members. The two abutment members for the or each pair of presser means being rigidly interconnected with each other, each presser means having a part which is movable in a plane pa-rallel to the plane of the surface of the moulding table inwardly and outwardly relatively to the respective abutment member for engagement with and disengagement from a moulding box when sup-ported on the moulding table.
Description
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This invention relates to a machine for producing casting mould parts.
The substantial increase in size of moulding boxes, in which mould parts are formed, in consequence of complete mechanisation of mould forming installations, has resulted in a substantial increase in resilient deformation or bulging-out of the moulding boxes during compaction of the mould-forming .
material within them. Furthermore, the resilient deformation of the moulding boxes during compaction is further increased due to the introduction of high-pressure moulding. Another cause of the increase in the resilient deformation of the moulding boxes during compaction is the employment of new methods of filling the mould-forming material, e.g. sand, into the moulding boxes, wherein, prior to compaction the sand ; 15 filling is stripped on the upper side, in profiled manner adapted to the volume of the pattern.
The resilient deformation of the moulding box attains its maximum value during compaction, particularly when ` forming mould parts using patterns of large volume. The resilient deformation of the moulding box is accompanied by the disadvantage that, on separating the mould parts from the ~ j . .
pattern device, it promotes the tearing-off of mould pieces and mould edges. It is a further consequence o~ the deformation of the moulding box that the occurrence of dislocations in the ~5 mould parts lS increased and also the dimenslonal accuracy of ~ the mould parts is impaired.
-', According to the present invention there is provided
This invention relates to a machine for producing casting mould parts.
The substantial increase in size of moulding boxes, in which mould parts are formed, in consequence of complete mechanisation of mould forming installations, has resulted in a substantial increase in resilient deformation or bulging-out of the moulding boxes during compaction of the mould-forming .
material within them. Furthermore, the resilient deformation of the moulding boxes during compaction is further increased due to the introduction of high-pressure moulding. Another cause of the increase in the resilient deformation of the moulding boxes during compaction is the employment of new methods of filling the mould-forming material, e.g. sand, into the moulding boxes, wherein, prior to compaction the sand ; 15 filling is stripped on the upper side, in profiled manner adapted to the volume of the pattern.
The resilient deformation of the moulding box attains its maximum value during compaction, particularly when ` forming mould parts using patterns of large volume. The resilient deformation of the moulding box is accompanied by the disadvantage that, on separating the mould parts from the ~ j . .
pattern device, it promotes the tearing-off of mould pieces and mould edges. It is a further consequence o~ the deformation of the moulding box that the occurrence of dislocations in the ~5 mould parts lS increased and also the dimenslonal accuracy of ~ the mould parts is impaired.
-', According to the present invention there is provided
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a machine for producing casting mould parts, comprising a moulding table for supporting a moulding box, a compaction press for compacting mould-forming material in the moulding box and at least one pair of mutually oppositely acting presser means arranged to engage respectively opposite sides of a moulding box when supported on the moulding table and to react against respective abutment members, the -two abutment members for the or each pair of presser means being rigidly interconnected with each other, each presser means having a part which is movable in a plane parallel to the plane of the surface of the moulding table inwardly and outwardly relatively to the respective abutment member for engagement with and disengagement from a moulding when supported on the moulding table.
Embodiments of the present invention reduce to an acceptable degree the resilient deformation of moulding boxes during compaction, without the need for special reinforcing measures on the moulding boxes and therewith without an increase in weight, of the moulding boxesO
In a preferred embodiment of the present invention, the presser means are mounted in such a way as to be stationary relative to the moulding table, and therefore to the moulding .
box, during compaction.
; The abutment members may be in-terconnected by a closed frame.
An especially advantageous embodiment of the . invention consists in that the movable part of each of the .
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a machine for producing casting mould parts, comprising a moulding table for supporting a moulding box, a compaction press for compacting mould-forming material in the moulding box and at least one pair of mutually oppositely acting presser means arranged to engage respectively opposite sides of a moulding box when supported on the moulding table and to react against respective abutment members, the -two abutment members for the or each pair of presser means being rigidly interconnected with each other, each presser means having a part which is movable in a plane parallel to the plane of the surface of the moulding table inwardly and outwardly relatively to the respective abutment member for engagement with and disengagement from a moulding when supported on the moulding table.
Embodiments of the present invention reduce to an acceptable degree the resilient deformation of moulding boxes during compaction, without the need for special reinforcing measures on the moulding boxes and therewith without an increase in weight, of the moulding boxesO
In a preferred embodiment of the present invention, the presser means are mounted in such a way as to be stationary relative to the moulding table, and therefore to the moulding .
box, during compaction.
; The abutment members may be in-terconnected by a closed frame.
An especially advantageous embodiment of the . invention consists in that the movable part of each of the .
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presser means comprises a pin or bolt provided with actuating means for moving it into engagement with the moulding box~ The actuating means may comprise a wedge element which is slidable in the respective abutment member in a direction perpendicular to the direction of move-ment of the pin.
~ return spring is advantageously provided for moving the pin out of engagement with the moulding boxv The wedge element may be actuable by a pneumatic or hydraulic cylinder and piston unit, preferably operating in the vertical direction. Preferably, each wedge element is connected to the pis-ton of the respective cylinder and piston unit by a lost motion connection, for example by making the height of the wedge element smaller than the distance between abutments on the piston rod for driving -the wedge element. The abutment members may be rigidly connected to the moulding table, and they may comprise columns fast both wlth the moulding table and also with the press or cross-piece.
For a better understanding of the present invention, and to show how the same may be carried into effect, reference will now be made to the accompanying drawings, in which:
Figure 1 shows a first embodiment of a machine for producing mould parts as seen in the direction of the arrow I in Figure 2, Figure 2 is a plan view o-f the machine of Figure 1, Figure 3 is a sectional view taken along the line III-III of Figure 2, ~`', .
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Figure 3a shows a detail of Figure 3, drawn to a larger scale, Figure ~ shows a sectional view taken along the line IV-IV o~ Figure 5, Figure 5 is a sectional view taken along the line V-V of Figure 3, Figure 6 shows a second embodiment of a machine for producing mould pa.rts as seen in the direction of the arrow VI in Figure 7, Figure 7 is a plan view of the machine of Figure 6, ~ :
Figure 8 shows a third embodiment of a machine for producing mould parts as seen in the direction of arrow VIII
in Figure 9, .
Figure 9 is a plan view O-e the machine of Figure 8, ~ :
; 15 Figure 10 shows a fourth embodiment of a machine for producing mould parts, partly sectioned along the line X-X of Figure 11, in a first operative condition, Figure 11 is a plan view of the machine of Figure~:10 partly sectioned along the line XI-XI O:e Figure 10, Figure 12 is a sectional view taken along the line X-X of Figure 11, with the machine in a second operative condition, Figure 13 is a partly sectioned plan yiew of the machine in the second operative condition, Figure 1~ is a vertical sectional view taken along the line X-X of Figure 11, with the machine in a third operative : conditi.on, . .
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Figure 15 is a partly sectioned plan view of the machine in the third operative condition, Figure 16 is a longitudinal section of a modified form of the part illustrated in Figure 3, in one operative condition, and Figure 17 shows the same part as Figure 16 in another operative condition~
The machine shown in Figures 1 and 2 has a press moulding table 1 J a compactionL2, and two columns 3 and 4 which are rigidly interconnected and constitute a closed frame. A
pattern device 7 on the moulding table 1 carries a moulding box 5 which is filled with mould-forming material such as moulding sand, and which has thereon a filling frame 8. The moulding table 1 is supported on a vibrating or jolting device 9 of known design. The press 2 has a press cylinder 12 in which is guided a press piston 11 carrying a press plate 10.
The machine shown in Figures 1 and 2 is adapted to execute a compacting process by simultaneous free-fall jolting and pressing according to German Auslegeschrift No. 24 52 984.
` 20 The machine has presser means 13 and 14 for engaging the moulding box 5~ The presser means 13 comprises a pin 35 with actuating means 65 and a pin 36 with actuating means 66, while the presser means 14 comprises a pin 29 with actuating means 63 and a pin 29a with actuating means 64.
The presser means 14 are shown in detail in Figures 3 to 5. On the post or column 4 is fixed an abutment member 15 which serves as a support for a cylinder 19 inwhich is slidably :
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mounted a piston or plunger 20 having a piston rod 21, A
wedge element 22 is mounted on the piston rod 21 between two abutments 23 and 24. The spacing between the abutments 23 and 24 exceeds the height 25 of the wedge element 22, to afford a lost motion connection so that on actuating the piston rod 21 the latter displaces the wedge element 22 only after travell-ing through a pre-determined distance. The wedge element 22 is adapted to be displaced vertically from position 26 back into position 27 and is pressed by a helical return spring 28, acting through the pin 29, against a sliding face 30 of the abutment member 15. Instead of the helical return springs 28 it is also possible to employ a leaf spring or other resilient means to act on the pin 290 The position 26 of the wedge element 22 corresponds to the position 31 of the pin 29 and the position 27 of the wedge element 22 to the position 32 of the pin 29. The pin 29 has anend portion 92 which is adapted to be pressed against the face of the moulding box 5.
Reference numerals 19 to 32 and 92 relate to the , pin 29 and the actuating means 63 disposed at a lower level ; 20 whereas reference numerals l9a to 32a and 92a relate to the pin 29a and the actuating means 64 disposed at the upper level~ ;
Since both actuating means 63 and 64 operate in a similar -~
manner, only the lower actuating means 63 is described.
^ The operation of the machine shown in ~igures 1 to 5 is as follows:
- , After placing on the moulding table 1 the pa-ttern device 7 with the moulding box 5 filled with moulding sand and ~,' '' -; ' '. " ' ~ 7 .
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supporting the filling frame 8, the actuating means 63, 64 and 65, 66 are operated. The pressure chamber 93 (see Figures 3 to 5) of the pneumatic or hydraulic cylinder 19 is supplied with fluid under pressure, thereby displacing the piston 20, the piston rod 21 and, by means of the abutment 24, the wedge element 22 in the direction of arrow 94, until the pin 29 "
reaches the position 31 and the portion 92 engages the moulding ' box 5 without, however, resiliently deforming the latter for example, by using a pressure which is sufficient only to cause compression of the spring 28~ At the same time, the pressure chamber 97 of the pneumatic or hydraulic cylinder l9a is supplied with fluid under pressure to displace the piston 20a with the piston rod 21a and, by means of the abutment 24_ the wedge element 22a in the direction of arrow 98, until the pin 29a reaches the position 31a in which it bears against the moulding box 5 without resiliently deforming the latter. The actuating means 65, 66 are actuated at the same time as the '; actuating means 63, 64 and in the same manner.
The angle 69 (see Figure 3a) between a plane 33 ' parallel to the slide face 30 and the plane of the inclined ' face 99 of the wedge element 22, or the corresponding angle for the inclined face 100 of the wedge element 22a is so selected that the friction occurring between the faces 99 and 100 and the respective pins 29 and 29a prevents sliding-back of the wedge element 22 in the direc-tion opposite to that of , the arrow 9~ and sliding-back of the wedge element 22a in th,e ' direction opposite to that of the arrow 98~ The angles 67 ..
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and 68 are selected to be larger, in order that the control paths of the wedge elements 22 or 22a are not excessively long.
Once all the pins 29, 29a, 35, 36 engage the moulding box 5, the press 2 is put into operation and presses, via the press piston 11 and the press plate 10, the moulding sand disposed in the moulding box 5 and the filling -~rame 8.
Thereupon, the jolting device 9 raises the moulding table 1 and all the components connected to it and allows it to fall freely several times onto a jolting cylinder 95, while the press 2 remains in operation. Experiment has shown that the maximum compaction of the moulding sand takes place on impingement of the moulding table 1 on the jolting cylinder 95, due to the inertia forces produced both in the moulding sand and in the press plate as well as to the pressing action of the press 2. Since, on impingement of the moulding table 1 on the jolting cylinder 95, there are set up also in the wedge elements 22, 22a, in the~ piston rods 21, 21a and in the pistons 20, 20a inertia forces which tend to press the support pins 29, 29a increasingly ~irmly against the moulding .
box 5, and an identical effect is also produced in the ~ actuating means 65, 66, the positions of the actuating means 63 ;~ to 66 remain unchanged during maximym compaction of the moulding - sand. Since the posts 3, 4 are designed to be so rigid that ~-~ the forces acting on them during compaction of the moulding sand practically speaking produce no deformation and the pins 29, 29a, 35, 36 are subjected exclusively to compression stressing, no resilient deformation is possible at the supported locations ~ of the moulding box 5 during compac-tion. After compaction has `~ been completed, the press 2 is operated in reverse, the press ., ,: . , , - : . .
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piston 11 raises the press plate 10 and the cylinders 19, :
19a o~ the actuating means 63, 64 and also the cylinders of the actuating means 65, 66 are also operated in reverse and raise the wedge elements 22, 22a and the wedge element o~ the actuating means 65, 66, whereupon (in a manner which has already been described) the support pins 29, 29a 35, 36 are withdrawnO
Whereas Figures 1 and 2 show the application o~ the present invention to a machine ior producing "high" mould parts having small moulding iaces, the embodiment according to Figures 6 and 7 is an application of the present invention to a machine ~or producing relatively low mould parts having larger moulding iaces~ ~igures 6 and 7 show columns 47, 48 rigidly fixed to a moulding table 46 and a press 49 to cons-titute a closed ~rame. Presser means 40, 41 bear at abutment members aiforded by the columns 47, 48. Further columns 50, 51, which - are rigidly ~ixed to the moulding table 46 and a second press 52, also a~ford abutments on which bear further presser means 44, 45. ~urther columns 53, 54, also rigidly fixed to the moulding table 46 are interconnected at their top ends by a cross-piece 55 to constitute a closed irame, and afiord abut-ments on which bear iurther presser means 42, 43. On the moulding table 46 rests a pattern device 56, which supports a moulding box 57 ~illed with moulding sand, and a iilling ~rame 58. Associated with the press 49 is a press plate 59 and with the press 52 a press plate 60. The moulding table 46 is supported on a jolting device 61.
The mode of operation oi the machine shown in ,. . , ~ : . : :
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Figures 6 and 7 corresponds to that of the machine o-f Figures 1 to 5 and is therefore not once again described.
Figures 8 and 9 show a further embodi~ent in accordance with the present invention. This embodiment com~rises a machine for compacting the mould parts by pressing only. A
moulding table 71 is supported on a ~oundation 72 by four posts 70~ The moulding table 71 carries, on two posts 73 and 7~, a cross-piece 75 supporting a press 76~ An element of the moulding table 71 is designed as a bowed member or bracket 77 having on one side presser means 78 which has a pin 79 and on the other side presser means 80 which has a pin 81. A
further element o~ the moulding table 71 is also designed as a bowed member 82 and has on one side presser means 83 having a pin 84 and on the other side presser means 85 having a pin 86. The press 76 is connected via a press piston 87 with a press plate 88. On the moulding table 71 rests a pattern device 89. Supported on the latter is a moulding box 90 filled with moulding sand and on the moulding box rests -filling ~rame 91.
The machine shown in Figures 8 and 9 operates in ~ the following manner:
- Af-ter a transport device (not shown~ has placed the pattern device 89, the moulding box 90 ~illed with moulding sand and the filling ~rame 91 on the moulding table 71, the presser means 78, 80, 83, 85 are actuated on the manner -~
already described with re~erence to Figures 1 to 5. The pins 79, 81, 8~, 86 are put into engagement with the moulding .; , .
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box 90 and, at the supported locations of the moulding box 90, prevent (in the manner already described) resilient de~ormation of the moulding box 90 during compaction of the mould parts, Compaction of the mould parts is e~fected by pressing only, the press 76 being put into operation and -thereby, via the press piston 87, pressing the press plate 88 thereon, for compacting the moulding sand~ After compaction has been effected, the press plate 88 is (in the manner already described with reference to Figures 1 and 2) raised and, due to actuation o-f the presser means 78, 80, 83, 85, the pins 79, 81, 84, 86 are withdrawn.
The presser means described hereinabove, which supports the moulding box of the mould parts on a machine element which does not vary its position relative to the moulding box during compaction, can be used on known moulding machines producing mould parts by compaction.
The machine shown in Figures 10 to 15 comprise a support 101 havlng a lower support element 102 and a projecting upper support element 103. Mounted on the lower support 102 is a compaction cylinder 10~ the compaction piston 105 o~
which is hydraulically or pneumatically actuable. The upper end of the compaction piston 105 is rigidly connected to a moulding table 106 on which a pattern plate 108 equipped with patterns 107 is releasably secured. Adapted to be applied on the pattern plate 108 is a moulding box 110 formed with dowel bores 109, lO9a and which is retained accurately in position by centreing means on the moulding table 106. Depending on the '~ :
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compacting ~ethod employed, it is also possible to provide for the moulding box 110 a known holding-down (press pad) arrangement.
Provided coaxially with the compaction cylinder 10~, above the moulding table 106, is a press pla-te 111 shaped to fit into the free internal cross-section of the moulding box 110 and connected to be raised and lowered by means of a hydraulically or pneumatically actuable cylinder and piston unit comprising a piston 112 and a feed cylinder 113. The feed cylinder 113 is releasably inserted into receiving means 114 arranged in the upper support element 103. ~or introducing a moulding substance (for example moulding sand 121), a filling frame 122 adapted to be located on the moulding box 110 is provided. The compaction cylinder 104, the compaction piston 105, the moulding table 106, the pattern plate 108, the press plate 111 and the feed cylinder 113 having the piston 112 form, together, a pre-compacting unit.
Arranged on each side of the feed cylinder 113, : 20 on the upper support element 103, are supports 115, 115a provided for receiving the cylinders 116 of hydraulically or pneumatically actuable lifting jacks 117. Extending from the cylinders 116 are piston rods 118 connected at their lower ends, via articulation elements 119, with a closed frame 120.
~, 25 By means of the lifting jacks 117, the frame 120 can be .
raised and lowered and is supported in an articulated manner . by the articulation elements 119. Depending on the shape of :~ ' ; - t3 -. ' .
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the moulding box, one or more lifting jacks 117 are provided for the vertical movement of the frame 120 (in the case of the present example, four are provided).
The articulation element 119 is a combination o-f a cup-shaped member 123 connected with the piston rod 118 and a retaining ring 124 co-operating with the member 123, in combinatlon with a spring 126 housed partially within the member 123 and guided on a pin 125. The member 123 has an outwardly projecting rim adapted to engage a collar formed on the retaining ring 124 and projec-ting radially inwardly.
The retaining ring 124 and the pin 125 are fixed to the frame 120. The spring 126 (for example a compression spring) bears at one end on the member 123 and at the other end on the frame 120.
The closed frame 120 is designed to ex-tend around the moulding box 110 by both positive and force-locking engagement, and it has actuating means 127 arranged around the sides of the generally rectangular frame 120 which afford abutment members. The actuating means 127 are constitu-ted by hydraulically or pneumatically actuable cylinder and piston units comprising cylinders 127a and pistons having piston rods 128 which are movable towards and away from the moulding box wall. By means of lines (not shown) conveying a pressure medium, the cylinders 127a and the lifting Jacks 117 are connected with a central control installation from whlch the compaction cylinder 104 and the feed cylinder 113 are also controlled.
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The end projecting out of the cylinder 127a, of each pressure piston 128 is connected in an ar-ticulated manner with a presser plate 129 adapted to be applied at the mould box 110. The presser plate 129 is designed for transmi-t-ting and taking up forces to and from the moulding box wall, Each presser plate 129 and the respective actuating means 127 constitute presser means.
Instead of the fluid actuable presser means 127a, 128, 129, it is also possible to provide such means in the form of a mechanically actuable device or a combination of the two.
Similarly, instead of the machine shown, the present invention can be applied to an automatic mould-forming machine having one or more moulding stations.
The mode of operation of the machine shown in Figures 10 to 15 is as follows:
At commencement of manufacture of a casting or ingot mould part (Figures 10 and 11) the compaction piston 105 of the compacting cylinder 104 is relieved of pressure, under the ; control of -the control device during controlled developmentof the process, and the press plate 111 is, via the piston 112 of the feed cylinder 113, brought into position over the filling frame 122. The frame 120 is lif-ted above the mould 110 by means of the lifting jacks il7. The presser plates 129 of the actuating means 127 are relieved of pressure and abut, in their rear position, on the frame 120. In this condition of the machine, the moulding box 110 is accurately posi-tioned on the pattern plate 108 and the filling frame 122 is set down .
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on the moulding box 110. Subsequently, the moulding box 110 is filled with a dosed quantity of moulding sand 121.
The nex-t step in the mould -forming operation (shown ib Figures 12 and 13) is the compaction of the ingot mould part, the frame 12O surrounding the moulding box 110 and being meanwhile lowered on to the moulding table 106, In this position, the -frame 12O is displaceably retained by the artic~llation elements 119, and bears on the moulding table 106. Then a pressure medium (for example oil) is fed (with timed control) to the pressure cylinders 127a and therewith the presser plates 129 engage the moulding box 110. Since the moulding box 110 is relatively rigidly -fixed in position on the moulding table 106, the frame 120 centres itself by means of the presser plates 129 on the moulding box 110, . 15 whereby the,actuating elements 127 which have been put under pressure are able to act on the mould1ng box walls together.
Next, a pressure medium (for example pressure oil) is fed to the feed cylinder 113 and thereby the press , ' plate 111 is lowered on to the moulding sand, for pre-; 20 compacting the moulding sand 121. For final compaction of ' the casting mould part, a pressure medium (for example pressure ; oil) is then fed to the compaction cylinder 104~ Due to the force exerted by the mould compacting unit on the moulding ' sand 121, transverse forces relative to -the moulding box wall are set up in the moulding sand. The magni-tude of these trans-~', verse forces is a function of the compacting pressure applied ' by the mould compacting unit and so the compacting pressure is -:
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proportionate to the deformation of the moulding box.
By means o-f control elements (not described in detail) of the central control device, the pressure of the pressure medium fed to the actua-ting means 127 is controlled in relationship to the compacting pressure whereby practically speaking -the pressure forces acting on the moulding box walls are put into a state of equilibrium and therewith the geometrical shape of the moulding box remains substantially underforned.
Whe the casting mould is ~inally compacted and ready for transport to- a further station for further pro-cessing of the mould, the press plate 111 and also the filling frame 122 are li-fted above the moulding box 110 and the frame - 120 is, when the presser plates 129 have been retracted to :
the starting positions, also lifted above the moulding box 110 (see Figures 14 and 15). Similarly, the compaction cylinder 104 is relieved of pressure and the moulding table 106 is, after removal of the finished casting mould part, prepared for receiving a further moulding box, thereby re-turning the machine to the condition shown in Figures 10 and 11.
Figures 16 and 17 show (in a detail o~ the machine shown in Figures 10 to 15) the frame 120 embracing a moulding box 110 and in which is provided an actuatlng means 127b for :
applying a presser element 129a to the moulding box 110. The ;
arrangement o~ the actuating means 127b is so selected that the direction o~ operation thereof is perpendicular to the walls of the moulding box. The actuating element 127b is releasably retained in a sleeve 140 fast with the frame 120.
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, The actuating means 127_ comprises a pressure hous-ing 141 in one portion of which there is formed a centrally arranged cylindrical bore 142 opening into a larger bore 1~3 in the other portion directed towards the moulding box 110.
Inserted into the larger bore 143 is a pin 144 the end of which, directed towards the bore 142, is provided with a collar 145 of greater cross-section than the pin 144. The other end of the pin 144 carries the presser element 129a and is so designed that the presser element 129a can be connected releasably and displaceably, e.g~ pivotably, to the pin 144.
Sealing of the larger bore 143 is afforded by a flange 146 which is releasably connected to the pressure housing 141.
Arranged centrally in the flange 146 is a guiding aperture 147 for the stem or shank of the pin 144.
bears at one A compression return spring/end on -the collar 145 of the pin 144 and at the other end on the flange 146. The spring 148 is preferably pré-stressed so that the pin 144 is always urged towards a predetermined rear position.
Inserted into the bore 142 is a piston 14~ which ~ 20 abuts the pin 144 to drive the latter.
; The end of the pressure housing 141 remote from the flange 146 is provided with locking means 150 which may be designed, as in this embodiment, as pneumatically or hydraulically actuable control valves Alternatively, the locking means 150 may be a mechanically or electrically operated means or means operating in combination therewith.
Provided at right-angles to the axis of symmetry of _ . ' - .' .. '. . .: . ' . . , . : ~ :: ~ ' ' ~
the pressure housing 141, in the control valve provided as ' locking means 150, is a continuous control bore 151 each of the ends of which are sealed by fluid-tight plug 152, 153.
Provided in the control bore 151 is a displaceable control piston 154. For actuating the control piston 154, there extends -through each of the plugs 152, 153 in the control bore 151, at both ends of the control piston 154, a control line 155, 156 connected via known control means with a central control . device.
10 To actuate the piston 149 by a pressure fluid .
(for example hydraulic oil), the control bore 151 is connected on the one hand via a pressure medium line 157 with a hydraulic unit constituting a pressure source and, on the :
other hand, via an aperture 158 with the bore 142. .
The mode of operation of'the arrangement described :::
; in Figures 16 and 17 is as follows:
The frame 120 (as described with reference to Figures 10 to 15) is brought into position over the'moulding box 110~ In this position (as shown in Figure 16) the pressure medium line 157 is controlled for return travel of the pressure :~
medium and the support pin 144 and presser element 129a connec-ted `, with the pin 144 are displaced, under the action of the com-pression spring 148, into the rear position thereof. The , control piston 154 is set in the throughflow position to allow j 25 the pressure medium to flow back through the pressure medium line 157.
If a pulse or impulse is supplied from the central , ~ - 19 -: : .
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control device to the control means o-E the pressure medium feed, then, due -to the supplied pressure medium the piston 149 is acted upon` and the presser elemen-t 129a connected with -the support pin 144 is moved in the direction -towards the moulding box walls As soon as the presser element 12ga bears against the moulding box walls, a pulse or impulse is supplied from a pressure-dependent control means (for example a pressure monitoring means) to the control means of the -control line 155, whereby the control piston 154 is displaced into the position shown in Figure 17. In this position, the pressure medium feed and, similarly, the pressure medium flow-back is blocked, and so the presser element 129a is locked in position abutting the mould box. To release the mould box 110, a pulse is applied to the control means oE the pressure medium feed and also to the control means Eor the control line 156, whereby the control piston 154 is moved to the left and (under the influence oE the compression spring 148) the presser plate 129a can be moved away from the moulding box 110 and displaced in-to -the rearward position.
The advantages achievable with the device just des-cribed consist in particular in that, due to the energy supplied Erom the pressing procedure to -the mould-:Eorming material, full use can be made also in the edge regions of the moulding box for compacting the mould-forming material, whereby uni~orm compacting is made possible and disloca-tion-free mould parts are obtained.
The advantages achievable with embodiments in accordance with the present invention consist in particular in . .
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that, whilst guaranteeing a high degree of rigidity during compaction, it becomes possible to employ light, inexpensive moulding boxes which, additionally, require simple transport devices. Due to the utilization of adjustable presser means, it is also possible to employ moulding boxes the external dimensi.ons of which may vary within wide limits. Fur-thermore, the energy supplied from the pressing operation to the mould-forming material can be employed fully also in the edge regions of the moulding box for compacting the mould-forming material, thereby making uniform compacting achievable and making it possible to obtain disloca-tion-free moulds. A further advantage consists in that mould part rupture can be avoided.
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presser means comprises a pin or bolt provided with actuating means for moving it into engagement with the moulding box~ The actuating means may comprise a wedge element which is slidable in the respective abutment member in a direction perpendicular to the direction of move-ment of the pin.
~ return spring is advantageously provided for moving the pin out of engagement with the moulding boxv The wedge element may be actuable by a pneumatic or hydraulic cylinder and piston unit, preferably operating in the vertical direction. Preferably, each wedge element is connected to the pis-ton of the respective cylinder and piston unit by a lost motion connection, for example by making the height of the wedge element smaller than the distance between abutments on the piston rod for driving -the wedge element. The abutment members may be rigidly connected to the moulding table, and they may comprise columns fast both wlth the moulding table and also with the press or cross-piece.
For a better understanding of the present invention, and to show how the same may be carried into effect, reference will now be made to the accompanying drawings, in which:
Figure 1 shows a first embodiment of a machine for producing mould parts as seen in the direction of the arrow I in Figure 2, Figure 2 is a plan view o-f the machine of Figure 1, Figure 3 is a sectional view taken along the line III-III of Figure 2, ~`', .
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.
Figure 3a shows a detail of Figure 3, drawn to a larger scale, Figure ~ shows a sectional view taken along the line IV-IV o~ Figure 5, Figure 5 is a sectional view taken along the line V-V of Figure 3, Figure 6 shows a second embodiment of a machine for producing mould pa.rts as seen in the direction of the arrow VI in Figure 7, Figure 7 is a plan view of the machine of Figure 6, ~ :
Figure 8 shows a third embodiment of a machine for producing mould parts as seen in the direction of arrow VIII
in Figure 9, .
Figure 9 is a plan view O-e the machine of Figure 8, ~ :
; 15 Figure 10 shows a fourth embodiment of a machine for producing mould parts, partly sectioned along the line X-X of Figure 11, in a first operative condition, Figure 11 is a plan view of the machine of Figure~:10 partly sectioned along the line XI-XI O:e Figure 10, Figure 12 is a sectional view taken along the line X-X of Figure 11, with the machine in a second operative condition, Figure 13 is a partly sectioned plan yiew of the machine in the second operative condition, Figure 1~ is a vertical sectional view taken along the line X-X of Figure 11, with the machine in a third operative : conditi.on, . .
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Figure 15 is a partly sectioned plan view of the machine in the third operative condition, Figure 16 is a longitudinal section of a modified form of the part illustrated in Figure 3, in one operative condition, and Figure 17 shows the same part as Figure 16 in another operative condition~
The machine shown in Figures 1 and 2 has a press moulding table 1 J a compactionL2, and two columns 3 and 4 which are rigidly interconnected and constitute a closed frame. A
pattern device 7 on the moulding table 1 carries a moulding box 5 which is filled with mould-forming material such as moulding sand, and which has thereon a filling frame 8. The moulding table 1 is supported on a vibrating or jolting device 9 of known design. The press 2 has a press cylinder 12 in which is guided a press piston 11 carrying a press plate 10.
The machine shown in Figures 1 and 2 is adapted to execute a compacting process by simultaneous free-fall jolting and pressing according to German Auslegeschrift No. 24 52 984.
` 20 The machine has presser means 13 and 14 for engaging the moulding box 5~ The presser means 13 comprises a pin 35 with actuating means 65 and a pin 36 with actuating means 66, while the presser means 14 comprises a pin 29 with actuating means 63 and a pin 29a with actuating means 64.
The presser means 14 are shown in detail in Figures 3 to 5. On the post or column 4 is fixed an abutment member 15 which serves as a support for a cylinder 19 inwhich is slidably :
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mounted a piston or plunger 20 having a piston rod 21, A
wedge element 22 is mounted on the piston rod 21 between two abutments 23 and 24. The spacing between the abutments 23 and 24 exceeds the height 25 of the wedge element 22, to afford a lost motion connection so that on actuating the piston rod 21 the latter displaces the wedge element 22 only after travell-ing through a pre-determined distance. The wedge element 22 is adapted to be displaced vertically from position 26 back into position 27 and is pressed by a helical return spring 28, acting through the pin 29, against a sliding face 30 of the abutment member 15. Instead of the helical return springs 28 it is also possible to employ a leaf spring or other resilient means to act on the pin 290 The position 26 of the wedge element 22 corresponds to the position 31 of the pin 29 and the position 27 of the wedge element 22 to the position 32 of the pin 29. The pin 29 has anend portion 92 which is adapted to be pressed against the face of the moulding box 5.
Reference numerals 19 to 32 and 92 relate to the , pin 29 and the actuating means 63 disposed at a lower level ; 20 whereas reference numerals l9a to 32a and 92a relate to the pin 29a and the actuating means 64 disposed at the upper level~ ;
Since both actuating means 63 and 64 operate in a similar -~
manner, only the lower actuating means 63 is described.
^ The operation of the machine shown in ~igures 1 to 5 is as follows:
- , After placing on the moulding table 1 the pa-ttern device 7 with the moulding box 5 filled with moulding sand and ~,' '' -; ' '. " ' ~ 7 .
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supporting the filling frame 8, the actuating means 63, 64 and 65, 66 are operated. The pressure chamber 93 (see Figures 3 to 5) of the pneumatic or hydraulic cylinder 19 is supplied with fluid under pressure, thereby displacing the piston 20, the piston rod 21 and, by means of the abutment 24, the wedge element 22 in the direction of arrow 94, until the pin 29 "
reaches the position 31 and the portion 92 engages the moulding ' box 5 without, however, resiliently deforming the latter for example, by using a pressure which is sufficient only to cause compression of the spring 28~ At the same time, the pressure chamber 97 of the pneumatic or hydraulic cylinder l9a is supplied with fluid under pressure to displace the piston 20a with the piston rod 21a and, by means of the abutment 24_ the wedge element 22a in the direction of arrow 98, until the pin 29a reaches the position 31a in which it bears against the moulding box 5 without resiliently deforming the latter. The actuating means 65, 66 are actuated at the same time as the '; actuating means 63, 64 and in the same manner.
The angle 69 (see Figure 3a) between a plane 33 ' parallel to the slide face 30 and the plane of the inclined ' face 99 of the wedge element 22, or the corresponding angle for the inclined face 100 of the wedge element 22a is so selected that the friction occurring between the faces 99 and 100 and the respective pins 29 and 29a prevents sliding-back of the wedge element 22 in the direc-tion opposite to that of , the arrow 9~ and sliding-back of the wedge element 22a in th,e ' direction opposite to that of the arrow 98~ The angles 67 ..
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and 68 are selected to be larger, in order that the control paths of the wedge elements 22 or 22a are not excessively long.
Once all the pins 29, 29a, 35, 36 engage the moulding box 5, the press 2 is put into operation and presses, via the press piston 11 and the press plate 10, the moulding sand disposed in the moulding box 5 and the filling -~rame 8.
Thereupon, the jolting device 9 raises the moulding table 1 and all the components connected to it and allows it to fall freely several times onto a jolting cylinder 95, while the press 2 remains in operation. Experiment has shown that the maximum compaction of the moulding sand takes place on impingement of the moulding table 1 on the jolting cylinder 95, due to the inertia forces produced both in the moulding sand and in the press plate as well as to the pressing action of the press 2. Since, on impingement of the moulding table 1 on the jolting cylinder 95, there are set up also in the wedge elements 22, 22a, in the~ piston rods 21, 21a and in the pistons 20, 20a inertia forces which tend to press the support pins 29, 29a increasingly ~irmly against the moulding .
box 5, and an identical effect is also produced in the ~ actuating means 65, 66, the positions of the actuating means 63 ;~ to 66 remain unchanged during maximym compaction of the moulding - sand. Since the posts 3, 4 are designed to be so rigid that ~-~ the forces acting on them during compaction of the moulding sand practically speaking produce no deformation and the pins 29, 29a, 35, 36 are subjected exclusively to compression stressing, no resilient deformation is possible at the supported locations ~ of the moulding box 5 during compac-tion. After compaction has `~ been completed, the press 2 is operated in reverse, the press ., ,: . , , - : . .
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piston 11 raises the press plate 10 and the cylinders 19, :
19a o~ the actuating means 63, 64 and also the cylinders of the actuating means 65, 66 are also operated in reverse and raise the wedge elements 22, 22a and the wedge element o~ the actuating means 65, 66, whereupon (in a manner which has already been described) the support pins 29, 29a 35, 36 are withdrawnO
Whereas Figures 1 and 2 show the application o~ the present invention to a machine ior producing "high" mould parts having small moulding iaces, the embodiment according to Figures 6 and 7 is an application of the present invention to a machine ~or producing relatively low mould parts having larger moulding iaces~ ~igures 6 and 7 show columns 47, 48 rigidly fixed to a moulding table 46 and a press 49 to cons-titute a closed ~rame. Presser means 40, 41 bear at abutment members aiforded by the columns 47, 48. Further columns 50, 51, which - are rigidly ~ixed to the moulding table 46 and a second press 52, also a~ford abutments on which bear further presser means 44, 45. ~urther columns 53, 54, also rigidly fixed to the moulding table 46 are interconnected at their top ends by a cross-piece 55 to constitute a closed irame, and afiord abut-ments on which bear iurther presser means 42, 43. On the moulding table 46 rests a pattern device 56, which supports a moulding box 57 ~illed with moulding sand, and a iilling ~rame 58. Associated with the press 49 is a press plate 59 and with the press 52 a press plate 60. The moulding table 46 is supported on a jolting device 61.
The mode of operation oi the machine shown in ,. . , ~ : . : :
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Figures 6 and 7 corresponds to that of the machine o-f Figures 1 to 5 and is therefore not once again described.
Figures 8 and 9 show a further embodi~ent in accordance with the present invention. This embodiment com~rises a machine for compacting the mould parts by pressing only. A
moulding table 71 is supported on a ~oundation 72 by four posts 70~ The moulding table 71 carries, on two posts 73 and 7~, a cross-piece 75 supporting a press 76~ An element of the moulding table 71 is designed as a bowed member or bracket 77 having on one side presser means 78 which has a pin 79 and on the other side presser means 80 which has a pin 81. A
further element o~ the moulding table 71 is also designed as a bowed member 82 and has on one side presser means 83 having a pin 84 and on the other side presser means 85 having a pin 86. The press 76 is connected via a press piston 87 with a press plate 88. On the moulding table 71 rests a pattern device 89. Supported on the latter is a moulding box 90 filled with moulding sand and on the moulding box rests -filling ~rame 91.
The machine shown in Figures 8 and 9 operates in ~ the following manner:
- Af-ter a transport device (not shown~ has placed the pattern device 89, the moulding box 90 ~illed with moulding sand and the filling ~rame 91 on the moulding table 71, the presser means 78, 80, 83, 85 are actuated on the manner -~
already described with re~erence to Figures 1 to 5. The pins 79, 81, 8~, 86 are put into engagement with the moulding .; , .
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box 90 and, at the supported locations of the moulding box 90, prevent (in the manner already described) resilient de~ormation of the moulding box 90 during compaction of the mould parts, Compaction of the mould parts is e~fected by pressing only, the press 76 being put into operation and -thereby, via the press piston 87, pressing the press plate 88 thereon, for compacting the moulding sand~ After compaction has been effected, the press plate 88 is (in the manner already described with reference to Figures 1 and 2) raised and, due to actuation o-f the presser means 78, 80, 83, 85, the pins 79, 81, 84, 86 are withdrawn.
The presser means described hereinabove, which supports the moulding box of the mould parts on a machine element which does not vary its position relative to the moulding box during compaction, can be used on known moulding machines producing mould parts by compaction.
The machine shown in Figures 10 to 15 comprise a support 101 havlng a lower support element 102 and a projecting upper support element 103. Mounted on the lower support 102 is a compaction cylinder 10~ the compaction piston 105 o~
which is hydraulically or pneumatically actuable. The upper end of the compaction piston 105 is rigidly connected to a moulding table 106 on which a pattern plate 108 equipped with patterns 107 is releasably secured. Adapted to be applied on the pattern plate 108 is a moulding box 110 formed with dowel bores 109, lO9a and which is retained accurately in position by centreing means on the moulding table 106. Depending on the '~ :
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compacting ~ethod employed, it is also possible to provide for the moulding box 110 a known holding-down (press pad) arrangement.
Provided coaxially with the compaction cylinder 10~, above the moulding table 106, is a press pla-te 111 shaped to fit into the free internal cross-section of the moulding box 110 and connected to be raised and lowered by means of a hydraulically or pneumatically actuable cylinder and piston unit comprising a piston 112 and a feed cylinder 113. The feed cylinder 113 is releasably inserted into receiving means 114 arranged in the upper support element 103. ~or introducing a moulding substance (for example moulding sand 121), a filling frame 122 adapted to be located on the moulding box 110 is provided. The compaction cylinder 104, the compaction piston 105, the moulding table 106, the pattern plate 108, the press plate 111 and the feed cylinder 113 having the piston 112 form, together, a pre-compacting unit.
Arranged on each side of the feed cylinder 113, : 20 on the upper support element 103, are supports 115, 115a provided for receiving the cylinders 116 of hydraulically or pneumatically actuable lifting jacks 117. Extending from the cylinders 116 are piston rods 118 connected at their lower ends, via articulation elements 119, with a closed frame 120.
~, 25 By means of the lifting jacks 117, the frame 120 can be .
raised and lowered and is supported in an articulated manner . by the articulation elements 119. Depending on the shape of :~ ' ; - t3 -. ' .
:
the moulding box, one or more lifting jacks 117 are provided for the vertical movement of the frame 120 (in the case of the present example, four are provided).
The articulation element 119 is a combination o-f a cup-shaped member 123 connected with the piston rod 118 and a retaining ring 124 co-operating with the member 123, in combinatlon with a spring 126 housed partially within the member 123 and guided on a pin 125. The member 123 has an outwardly projecting rim adapted to engage a collar formed on the retaining ring 124 and projec-ting radially inwardly.
The retaining ring 124 and the pin 125 are fixed to the frame 120. The spring 126 (for example a compression spring) bears at one end on the member 123 and at the other end on the frame 120.
The closed frame 120 is designed to ex-tend around the moulding box 110 by both positive and force-locking engagement, and it has actuating means 127 arranged around the sides of the generally rectangular frame 120 which afford abutment members. The actuating means 127 are constitu-ted by hydraulically or pneumatically actuable cylinder and piston units comprising cylinders 127a and pistons having piston rods 128 which are movable towards and away from the moulding box wall. By means of lines (not shown) conveying a pressure medium, the cylinders 127a and the lifting Jacks 117 are connected with a central control installation from whlch the compaction cylinder 104 and the feed cylinder 113 are also controlled.
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The end projecting out of the cylinder 127a, of each pressure piston 128 is connected in an ar-ticulated manner with a presser plate 129 adapted to be applied at the mould box 110. The presser plate 129 is designed for transmi-t-ting and taking up forces to and from the moulding box wall, Each presser plate 129 and the respective actuating means 127 constitute presser means.
Instead of the fluid actuable presser means 127a, 128, 129, it is also possible to provide such means in the form of a mechanically actuable device or a combination of the two.
Similarly, instead of the machine shown, the present invention can be applied to an automatic mould-forming machine having one or more moulding stations.
The mode of operation of the machine shown in Figures 10 to 15 is as follows:
At commencement of manufacture of a casting or ingot mould part (Figures 10 and 11) the compaction piston 105 of the compacting cylinder 104 is relieved of pressure, under the ; control of -the control device during controlled developmentof the process, and the press plate 111 is, via the piston 112 of the feed cylinder 113, brought into position over the filling frame 122. The frame 120 is lif-ted above the mould 110 by means of the lifting jacks il7. The presser plates 129 of the actuating means 127 are relieved of pressure and abut, in their rear position, on the frame 120. In this condition of the machine, the moulding box 110 is accurately posi-tioned on the pattern plate 108 and the filling frame 122 is set down .
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on the moulding box 110. Subsequently, the moulding box 110 is filled with a dosed quantity of moulding sand 121.
The nex-t step in the mould -forming operation (shown ib Figures 12 and 13) is the compaction of the ingot mould part, the frame 12O surrounding the moulding box 110 and being meanwhile lowered on to the moulding table 106, In this position, the -frame 12O is displaceably retained by the artic~llation elements 119, and bears on the moulding table 106. Then a pressure medium (for example oil) is fed (with timed control) to the pressure cylinders 127a and therewith the presser plates 129 engage the moulding box 110. Since the moulding box 110 is relatively rigidly -fixed in position on the moulding table 106, the frame 120 centres itself by means of the presser plates 129 on the moulding box 110, . 15 whereby the,actuating elements 127 which have been put under pressure are able to act on the mould1ng box walls together.
Next, a pressure medium (for example pressure oil) is fed to the feed cylinder 113 and thereby the press , ' plate 111 is lowered on to the moulding sand, for pre-; 20 compacting the moulding sand 121. For final compaction of ' the casting mould part, a pressure medium (for example pressure ; oil) is then fed to the compaction cylinder 104~ Due to the force exerted by the mould compacting unit on the moulding ' sand 121, transverse forces relative to -the moulding box wall are set up in the moulding sand. The magni-tude of these trans-~', verse forces is a function of the compacting pressure applied ' by the mould compacting unit and so the compacting pressure is -:
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proportionate to the deformation of the moulding box.
By means o-f control elements (not described in detail) of the central control device, the pressure of the pressure medium fed to the actua-ting means 127 is controlled in relationship to the compacting pressure whereby practically speaking -the pressure forces acting on the moulding box walls are put into a state of equilibrium and therewith the geometrical shape of the moulding box remains substantially underforned.
Whe the casting mould is ~inally compacted and ready for transport to- a further station for further pro-cessing of the mould, the press plate 111 and also the filling frame 122 are li-fted above the moulding box 110 and the frame - 120 is, when the presser plates 129 have been retracted to :
the starting positions, also lifted above the moulding box 110 (see Figures 14 and 15). Similarly, the compaction cylinder 104 is relieved of pressure and the moulding table 106 is, after removal of the finished casting mould part, prepared for receiving a further moulding box, thereby re-turning the machine to the condition shown in Figures 10 and 11.
Figures 16 and 17 show (in a detail o~ the machine shown in Figures 10 to 15) the frame 120 embracing a moulding box 110 and in which is provided an actuatlng means 127b for :
applying a presser element 129a to the moulding box 110. The ;
arrangement o~ the actuating means 127b is so selected that the direction o~ operation thereof is perpendicular to the walls of the moulding box. The actuating element 127b is releasably retained in a sleeve 140 fast with the frame 120.
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, The actuating means 127_ comprises a pressure hous-ing 141 in one portion of which there is formed a centrally arranged cylindrical bore 142 opening into a larger bore 1~3 in the other portion directed towards the moulding box 110.
Inserted into the larger bore 143 is a pin 144 the end of which, directed towards the bore 142, is provided with a collar 145 of greater cross-section than the pin 144. The other end of the pin 144 carries the presser element 129a and is so designed that the presser element 129a can be connected releasably and displaceably, e.g~ pivotably, to the pin 144.
Sealing of the larger bore 143 is afforded by a flange 146 which is releasably connected to the pressure housing 141.
Arranged centrally in the flange 146 is a guiding aperture 147 for the stem or shank of the pin 144.
bears at one A compression return spring/end on -the collar 145 of the pin 144 and at the other end on the flange 146. The spring 148 is preferably pré-stressed so that the pin 144 is always urged towards a predetermined rear position.
Inserted into the bore 142 is a piston 14~ which ~ 20 abuts the pin 144 to drive the latter.
; The end of the pressure housing 141 remote from the flange 146 is provided with locking means 150 which may be designed, as in this embodiment, as pneumatically or hydraulically actuable control valves Alternatively, the locking means 150 may be a mechanically or electrically operated means or means operating in combination therewith.
Provided at right-angles to the axis of symmetry of _ . ' - .' .. '. . .: . ' . . , . : ~ :: ~ ' ' ~
the pressure housing 141, in the control valve provided as ' locking means 150, is a continuous control bore 151 each of the ends of which are sealed by fluid-tight plug 152, 153.
Provided in the control bore 151 is a displaceable control piston 154. For actuating the control piston 154, there extends -through each of the plugs 152, 153 in the control bore 151, at both ends of the control piston 154, a control line 155, 156 connected via known control means with a central control . device.
10 To actuate the piston 149 by a pressure fluid .
(for example hydraulic oil), the control bore 151 is connected on the one hand via a pressure medium line 157 with a hydraulic unit constituting a pressure source and, on the :
other hand, via an aperture 158 with the bore 142. .
The mode of operation of'the arrangement described :::
; in Figures 16 and 17 is as follows:
The frame 120 (as described with reference to Figures 10 to 15) is brought into position over the'moulding box 110~ In this position (as shown in Figure 16) the pressure medium line 157 is controlled for return travel of the pressure :~
medium and the support pin 144 and presser element 129a connec-ted `, with the pin 144 are displaced, under the action of the com-pression spring 148, into the rear position thereof. The , control piston 154 is set in the throughflow position to allow j 25 the pressure medium to flow back through the pressure medium line 157.
If a pulse or impulse is supplied from the central , ~ - 19 -: : .
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control device to the control means o-E the pressure medium feed, then, due -to the supplied pressure medium the piston 149 is acted upon` and the presser elemen-t 129a connected with -the support pin 144 is moved in the direction -towards the moulding box walls As soon as the presser element 12ga bears against the moulding box walls, a pulse or impulse is supplied from a pressure-dependent control means (for example a pressure monitoring means) to the control means of the -control line 155, whereby the control piston 154 is displaced into the position shown in Figure 17. In this position, the pressure medium feed and, similarly, the pressure medium flow-back is blocked, and so the presser element 129a is locked in position abutting the mould box. To release the mould box 110, a pulse is applied to the control means oE the pressure medium feed and also to the control means Eor the control line 156, whereby the control piston 154 is moved to the left and (under the influence oE the compression spring 148) the presser plate 129a can be moved away from the moulding box 110 and displaced in-to -the rearward position.
The advantages achievable with the device just des-cribed consist in particular in that, due to the energy supplied Erom the pressing procedure to -the mould-:Eorming material, full use can be made also in the edge regions of the moulding box for compacting the mould-forming material, whereby uni~orm compacting is made possible and disloca-tion-free mould parts are obtained.
The advantages achievable with embodiments in accordance with the present invention consist in particular in . .
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that, whilst guaranteeing a high degree of rigidity during compaction, it becomes possible to employ light, inexpensive moulding boxes which, additionally, require simple transport devices. Due to the utilization of adjustable presser means, it is also possible to employ moulding boxes the external dimensi.ons of which may vary within wide limits. Fur-thermore, the energy supplied from the pressing operation to the mould-forming material can be employed fully also in the edge regions of the moulding box for compacting the mould-forming material, thereby making uniform compacting achievable and making it possible to obtain disloca-tion-free moulds. A further advantage consists in that mould part rupture can be avoided.
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Claims (24)
1. A machine for producing casting mould parts, com-prising a moulding table for supporting a moulding box, a com-paction press for compacting mould-forming material in the mould-ing box and at least one pair of mutually oppositely acting pres-ser means arranged to engage respectively opposite sides of a moulding box when supported on the moulding table and to react against respective abutment members, the two abutment members for the or each pair of presser means being rigidly interconnect-ed with each other, each presser means having a part which is movable in a plane parallel to the plane of the surface of the moulding table inwardly and outwardly relatively to the respec-tive abutment member for engagement with and disengagement from a moulding box when supported on the moulding table.
2. A machine as claimed in claim 1, in which the abutment members are mounted in such a way as to be stationary relative to the moulding table during operation of the press.
3. A machine as claimed in claim 2, in which the two abutment members for the or each pair of presser means are inter-connected by means of a closed frame.
4. A machine as claimed in claim 3, in which the frame is arranged generally in a plane parallel to the moulding table so as to extend around a moulding box when on the moulding table.
5. A machine as claimed in claim 4, in which the fra-me is provided with lifting means for lifting the frame upwardly relative to the moulding table.
6. A machine as claimed in claim 5, in which the lift-ing means is actuable hydraulically or pneumatically.
7. A machine as claimed in any one of claims 4 to 6, in which the frame is adapted to be self-centreing on a mould-ing box on the moulding table.
8. A machine as claimed in claim 5, in which the lifting means is connected to the frame by an articulated connection.
9. A machine as claimed in claim 1, in which each pres-ser means comprises a pin provided with actuating means for driving the pin outwardly relatively to the respective abutment member to cause one end portion of the pin to engage the moulding box.
10. A machine as claimed in claim 9, in which each pin is provided with a return spring arranged to bias the pin out of engagement with the moulding box.
11. A machine as claimed in claim 9 or 10, in which the actuating means are adapted to apply a force to the respective pins, which force is a function of the pressure applied by the press.
12. A machine as claimed in claim 9 or 10, in which each actuating means comprises a fluid operable cylinder and piston unit.
13. A machine as claimed in claim 1, in which locking means are provided for locking the presser means in position when the presser means are in engagement with a moulding box.
14. A machine as claimed in claim 13, in which the locking means comprise pneumatically or hydraulically operated control valves.
15. A machine as claimed in claim 13, in which the locking means comprise mechanical and/or electrical locking devices.
16. A machine as claimed in claim 9, 10 or 15 in which a presser element is displaceably mounted on the said one end of each pin.
17. A machine as claimed in claim 2, 3 in which the abutment members are rigidly connected to the moulding table.
18. A machine as claimed in claim 3, in which the moulding table affords part of the frame.
19. A machine as claimed in claim 18, in which the two abutment members of the, or at least one of the, pairs of presser means comprise columns which connect the press to the moulding table.
20. A machine as claimed in claim 18, in which the two abutment members of the, or at least one of the, pairs of presser means comprise columns which are interconnected at their upper ends by a cross member and at their lower ends by the mould-ing table.
21. A machine as claimed in claim 1, in which the ac-tuating means of each presser means comprises a wedge element which is displaceable on the respective abutment member in a di-rection perpendicular to the direction of movement of the respec-tive movable part of the presser means.
22. A machine as claimed in claim 21, in which each wedge element is displaceable in the vertical direction.
23. A machine as claimed in claim 21, in which each wedge element is connected for displacement to a respective fluid-operable cylinder and piston unit, forming part of actuating means provided on a pin of said presser means.
24. A machine as claimed in claim 23, in which each wedge element is connected to the piston of the respective cylin-der and piston unit by a lost motion connection.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CH127376 | 1976-02-02 | ||
| CH951976 | 1976-07-26 | ||
| CH1163676A CH614642A5 (en) | 1976-09-14 | 1976-09-14 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1080937A true CA1080937A (en) | 1980-07-08 |
Family
ID=27172848
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA270,817A Expired CA1080937A (en) | 1976-02-02 | 1977-02-01 | Machine for producing casting mould parts |
Country Status (8)
| Country | Link |
|---|---|
| JP (1) | JPS5295535A (en) |
| CA (1) | CA1080937A (en) |
| DE (1) | DE2701693C2 (en) |
| DK (1) | DK40977A (en) |
| ES (1) | ES455352A1 (en) |
| FR (1) | FR2339454A1 (en) |
| GB (1) | GB1559888A (en) |
| IT (1) | IT1077602B (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS55154655U (en) * | 1979-04-19 | 1980-11-07 | ||
| JPS57198144U (en) * | 1981-06-13 | 1982-12-16 | ||
| CH675552A5 (en) * | 1988-01-08 | 1990-10-15 | Fischer Ag Georg | |
| DE19701308C1 (en) * | 1997-01-16 | 1998-09-24 | Wagner Heinrich Sinto Masch | Mould making machine |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AT159336B (en) * | 1938-05-14 | 1940-08-10 | Heinr Herring & Sohn | Molding box. |
| JPS5146642B2 (en) * | 1973-11-10 | 1976-12-10 |
-
1977
- 1977-01-17 DE DE19772701693 patent/DE2701693C2/en not_active Expired
- 1977-01-26 FR FR7702102A patent/FR2339454A1/en active Granted
- 1977-01-26 ES ES455352A patent/ES455352A1/en not_active Expired
- 1977-01-31 IT IT1977677A patent/IT1077602B/en active
- 1977-02-01 CA CA270,817A patent/CA1080937A/en not_active Expired
- 1977-02-01 GB GB411177A patent/GB1559888A/en not_active Expired
- 1977-02-01 DK DK40977A patent/DK40977A/en not_active Application Discontinuation
- 1977-02-02 JP JP984377A patent/JPS5295535A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| FR2339454B1 (en) | 1983-01-14 |
| DE2701693A1 (en) | 1977-08-04 |
| DK40977A (en) | 1977-08-03 |
| JPS5295535A (en) | 1977-08-11 |
| DE2701693C2 (en) | 1982-12-23 |
| GB1559888A (en) | 1980-01-30 |
| IT1077602B (en) | 1985-05-04 |
| ES455352A1 (en) | 1978-03-16 |
| JPS5736055B2 (en) | 1982-08-02 |
| FR2339454A1 (en) | 1977-08-26 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |