EP3328573B1 - Sand moulding machine and method of producing sand mould parts - Google Patents

Sand moulding machine and method of producing sand mould parts Download PDF

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Publication number
EP3328573B1
EP3328573B1 EP15731712.4A EP15731712A EP3328573B1 EP 3328573 B1 EP3328573 B1 EP 3328573B1 EP 15731712 A EP15731712 A EP 15731712A EP 3328573 B1 EP3328573 B1 EP 3328573B1
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EP
European Patent Office
Prior art keywords
sand
sand mould
distance measuring
mould parts
measuring device
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EP15731712.4A
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German (de)
English (en)
French (fr)
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EP3328573A1 (en
Inventor
Per Larsen
Christoffer Bay
Jørn JOHANSEN
Christian Dam
Flemming Floro HAGEMANN
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Disa Industries AS
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Disa Industries AS
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Priority to PL15731712T priority Critical patent/PL3328573T3/pl
Publication of EP3328573A1 publication Critical patent/EP3328573A1/en
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Publication of EP3328573B1 publication Critical patent/EP3328573B1/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C11/00—Moulding machines characterised by the relative arrangement of the parts of same
    • B22C11/10—Moulding machines characterised by the relative arrangement of the parts of same with one or more flasks forming part of the machine, from which only the sand moulds made by compacting are removed
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C19/00—Components or accessories for moulding machines
    • B22C19/04—Controlling devices specially designed for moulding machines

Definitions

  • the present invention relates to a sand moulding machine for the production of sand mould parts
  • a moulding chamber formed by a chamber top wall, a chamber bottom wall, two opposed chamber side walls and two opposed chamber end walls, wherein a chamber wall is provided with at least one sand filling opening, wherein at least one of the chamber end walls is provided with a pattern plate having a pattern adapted to form a pattern in a sand mould part, wherein at least one of the chamber end walls is displaceable in a longitudinal direction of the moulding chamber in order to compact sand fed into the moulding chamber, wherein at least one of the pattern plates is associated with at least one reference pattern block positioned in fixed relationship to the pattern of said pattern plate and adapted to form a reference pattern in an external face of a sand mould part, and wherein a non-contact distance measuring device is arranged adjacent a path of travel of the compacted sand mould parts and is adapted to measure a varying distance to the reference patterns of the sand mould parts
  • match plate technique such as employed by DISA MATCH (Registered Trademark) horizontal flaskless match plate machines
  • vertical flaskless sand moulding technique such as the DISAMATIC (Registered Trademark) technique.
  • a match plate having moulding patterns on both sides facing away from each other is being clamped between two moulding chambers.
  • the patterns of the match plate are extending into each respective moulding chamber.
  • a slit-formed sand inlet opening extending across a wall is arranged at each moulding chamber.
  • a first and a second plate are arranged oppositely at either end of a moulding chamber.
  • the patterns of the pattern plates are extending into each respective end of the moulding chamber.
  • a slit-formed sand inlet opening extending across a wall is arranged typically at the top of the moulding chamber.
  • Sand is blown in through the slit-formed opening and into the moulding chamber. Thereafter, by displacement of the first and/or the second plate, the plates move relatively in direction towards each other and squeeze the sand therebetween. After being removed from the moulding chamber, the sand mould part is placed adjacent the previously moulded sand mould part on a conveyer. Thereby, two neighbouring sand mould parts form a complete sand mould. The cavity formed by these two sand mould parts constitutes a cavity for the subsequent casting of the metal product.
  • US 4,724,886 discloses an apparatus and method for detecting the misalignment of cooperating mould sections during operation of a mould making machine.
  • the mould making machine includes a device for forming a rectangular reference mark on the exterior of the mould surface and a non-contact distance measuring device for detecting the misalignment of the internal mould cavities of the mould sections by detecting any misalignment as a step between two adjacent external reference marks.
  • the distance measuring device initially detects a step increase in the measured distance as the reference mark passes into the field of view of the measuring device.
  • this distance changes in a stepwise manner in an amount greater than a previously established threshold tolerance, this indicates an internal misalignment and the operator is signalled, through a display on the system control unit.
  • the operator then has a choice of stopping the advancement of the mould sections and correcting the problem causing the misalignment, or the operator may wait and see if the misalignment was an isolated problem or a persistent problem by checking several subsequent mould sections for misalignment before stopping the production line.
  • the accuracy of the distance measurement is limited, and an indication of misalignment is only given if a distance change greater than a threshold tolerance is measured. A measure for the degree of misalignment is not indicated to the operator.
  • this arrangement may detect vertical, lateral and rotational mutual misalignment of adjacent mould sections, other parameters such as the width of a possible gap between adjacent mould sections, mould expansion and mould dimensions cannot be detected by this arrangement.
  • US 5,697,424 (Dansk Industri Syndikat A/S) describes an automatically operating moulding and casting plant comprising a moulding station for producing moulds by compressing moulding sand, a pouring station and an extraction station. It may happen, without the operator immediately noticing it, that when the newly compacted mould part is released from the pattern or patterns, against which it has been formed by compressing moulding sand, some moulding sand adheres to the pattern, thereby producing an error in the form of a recess in the casting cavity formed.
  • a number of video cameras depicting one or a number of process steps and/or the results of the same transmit the corresponding image information to central control means, in which the image information is compared to "ideal" image information, e.g. image information previously read-in and based on a process step proceeding correctly.
  • the central control means controls the affected stations in such a manner that undesired operational states or defective castings are avoided.
  • this method may not provide sufficiently accurate information about mutual misalignment of adjacent mould sections, such as for instance vertical, lateral and rotational mutual misalignment and the width of a possible gap between adjacent mould sections.
  • mould expansion and mould dimensions cannot be detected very accurately by this arrangement.
  • the object of the present invention is to provide a sand moulding machine and a method of producing sand mould parts, whereby more accurate detection of mutual misalignment of adjacent sand mould parts may be provided.
  • the at least one reference pattern block includes a set of at least two flat faces following one after the other in the longitudinal direction of the moulding chamber and being adapted to form a corresponding reference pattern including a set of at least two flat surfaces following one after the other in the displacement direction, each flat face is arranged at an oblique angle to another one of the flat faces, and the non-contact distance measuring device is adapted to measure the varying distance to the at least two flat surfaces of the reference pattern one after the other as they pass relatively the non-contact distance measuring device in succession during said relative displacement.
  • the position and orientation of straight lines representing each of the at least two flat surfaces may be determined, and on the basis thereof, the position or positions of one or more intersection points between such straight lines may be determined.
  • the position of such intersection points may be compared to the ideal position of the intersection points.
  • mutual misalignment of adjacent sand mould parts may be detected very accurately.
  • detection of mould specific parameters as for instance mould spring back and faulty orientation in the mould string may be determined.
  • the width of a possible gap between adjacent sand mould parts, mould expansion and mould dimensions may be detected by this arrangement. It may thereby be assessed whether the actual situation is acceptable or not.
  • each of said at least two flat faces forms an oblique angle with the longitudinal direction of the moulding chamber.
  • the oblique angle between two flat faces measured externally of the reference pattern block is in the range from 95 to 175 degrees or in the range from 185 to 265 degrees.
  • the oblique angle between two flat surfaces measured externally of the sand mould part is in the range from 115 to 155 degrees or in the range from 205 to 245 degrees.
  • the oblique angle between two flat surfaces measured externally of the sand mould part is in the range from 125 to 145 degrees or in the range from 215 to 235 degrees.
  • the non-contact distance measuring device is a laser-based distance sensor.
  • the position detection may be very accurate.
  • Non-contact distance measuring devices are preferred as high accuracy may not be obtained with mechanical measuring probes due to the strength properties of the compressed mould.
  • the non-contact distance measuring device is arranged to measure a distance in a direction at right angles to the displacement direction. Thereby, calculations in an associated computer system may be simplified.
  • At least one of the reference pattern blocks is arranged to form a reference pattern in a corner of a sand mould part
  • said reference pattern includes a first set of at least two flat surfaces following one after the other in the longitudinal direction of the moulding chamber and being arranged at right angles to the chamber top wall, each flat surface of the first set is arranged at an oblique angle to another one of the flat surfaces of the first set
  • said reference pattern includes a second set of at least two flat surfaces following one after the other in the longitudinal direction of the moulding chamber and being arranged at right angles to the chamber side walls, each flat surface of the second set is arranged at an oblique angle to another one of the flat surfaces of the second set
  • a first non-contact distance measuring device is arranged to measure the varying distance to the reference pattern as a result of the at least two flat surfaces of the first set passing relatively the non-contact distance measuring device in succession during the relative displacement in the displacement direction between the compacted sand mould parts and the non-contact distance measuring device, and a second non-
  • the first non-contact distance measuring device is arranged to measure a distance in a first measuring direction
  • the second non-contact distance measuring device is arranged to measure a distance in a second measuring direction being different from the first measuring direction.
  • the reference pattern block has the form of a fourth of an element combined from at least two truncated square pyramids fitted on top of each other, the top of a lower positioned truncated square pyramid matches the base of a higher positioned truncated square pyramid, and said element has been parted along its centreline and through the symmetry lines of adjacent lateral surfaces of the truncated square pyramids in order to form said fourth.
  • all faces of the reference pattern block intended to contact sand mould parts are formed with a draft angle in relation to the longitudinal direction of the moulding chamber.
  • a computer system is adapted to receive a number of distance measurements from the non-contact distance measuring device during the relative displacement in the displacement direction between the compacted sand mould parts and the non-contact distance measuring device, the computer system is adapted to perform curve fitting on the basis of said received distance measurements and thereby estimate the respective positions of a number of straight lines in a coordinate system, each straight line representing a respective one of the at least two flat surfaces of the reference pattern seen in cross-section, and wherein the computer system is adapted to calculate the position or positions of one or more intersection points between such straight lines.
  • the position or positions of one or more intersection points between such straight lines may be automatically determined.
  • the position of such intersection points may be automatically compared to the ideal position of the intersection points and to assess whether the present situation is acceptable or not.
  • the computer system is adapted to perform curve fitting and thereby estimate the respective positions of the number of straight lines based additionally on measurements of the relative position between the compacted sand mould parts and the non-contact distance measuring device during the relative displacement in the displacement direction between the compacted sand mould parts and the non-contact distance measuring device.
  • the respective positions of the number of straight lines may be estimated by curve fitting even if the relative speed between the sand mould parts and the non-contact distance measuring device during the relative displacement is not constant.
  • a position sensor is adapted to perform the measurements of the relative position between the compacted sand mould parts and the non-contact distance measuring device, and wherein the position sensor has the form of an absolute, non-contact position sensor working according to the magnetostrictive principle.
  • a set including a number of non-contact distance measuring devices is mounted on a measuring boom at least partially surrounding the path of travel of the compacted sand mould parts, and the set includes at least a non-contact distance measuring device arranged to measure a distance in a first direction and a non-contact distance measuring device arranged to measure a distance in a second direction being different from the first direction.
  • a conveyor is adapted to advance the compacted sand mould parts along the path of travel in order to achieve relative displacement in the displacement direction between the compacted sand mould parts and the non-contact distance measuring device.
  • said relative displacement necessary for the measurement of a distance by means of the non-contact distance measuring device may be achieved by means of a conveyor, which may anyway be necessary for transporting the compacted sand mould parts along the path of travel.
  • a separate device for displacing the non-contact distance measuring device may be avoided.
  • the non-contact distance measuring device is arranged displaceably in order to achieve relative displacement in the displacement direction between the compacted sand mould parts and the non-contact distance measuring device.
  • said relative displacement necessary for the measurement of a distance by means of the non-contact distance measuring device may be achieved even if the compacted sand mould parts stand still and are not conveyed.
  • two sand mould parts may be positioned on top of each other to form a complete sand mould on a conveyor, and the non-contact distance measuring device may be displaced in the vertical direction in order to achieve said relative displacement.
  • said relative displacement is in a direction which is not a conveying direction of the sand mould parts.
  • each of the chamber end walls is provided with a pattern plate having a pattern adapted to form a pattern in a sand mould part, and a conveyor is adapted to advance a number of compacted sand mould parts in aligned and mutually abutting configuration along a path of travel in a conveying direction corresponding to the longitudinal direction of the moulding chamber.
  • the sand moulding machine may work according to the vertical sand flaskless moulding technique such as the DISAMATIC (Registered Trademark).
  • the non-contact distance measuring device is arranged stationarily, a position sensor is adapted to perform the measurements of the relative position between the compacted sand mould parts and the non-contact distance measuring device in the form of the position in the conveying direction of the compacted sand mould parts, and the position sensor is coupled to a so-called Automatic Mould Conveyor (AMC), or a so-called Precision Mould Conveyor (PMC) or a so-called Synchronized Belt Conveyor (SBC).
  • AMC Automatic Mould Conveyor
  • PMC Precision Mould Conveyor
  • SBC Synchronized Belt Conveyor
  • a set of non-contact distance measuring devices is arranged along the path of travel of the compacted sand mould parts, the set includes two non-contact distance measuring devices arranged to measure a distance in an at least substantially vertical direction and a distance in an at least substantially horizontal direction, respectively, to a reference pattern in an upper left corner of a sand mould part, two non-contact distance measuring devices arranged to measure a distance in an at least substantially vertical direction and a distance in an at least substantially horizontal direction, respectively, to a reference pattern in an upper right corner of a sand mould part, one non-contact distance measuring device arranged to measure a distance in an at least substantially horizontal direction to a reference pattern at or above a lower left corner of a sand mould part, and one non-contact distance measuring device arranged to measure a distance in an at least substantially horizontal direction to a reference pattern at or above a lower right corner of a sand mould part.
  • a further non-contact distance measuring device is arranged to measure a distance obliquely in an upward or downward direction to the reference pattern at or above a lower left corner of a sand mould part, and a further non-contact distance measuring device is arranged to measure a distance obliquely in an upward or downward direction to the reference pattern at or above a lower right corner of a sand mould part.
  • two moulding chambers are separated by means of a match plate
  • the sand moulding machine is adapted to simultaneously compress two sand mould parts in the respective two moulding chambers and subsequently remove the match plate and position said two sand mould parts on top of each other to form a complete sand mould
  • the non-contact distance measuring device is arranged to measure the varying distance to the reference patterns of said two sand mould parts positioned on top of each other.
  • the sand moulding machine is adapted to position said two sand mould parts on top of each other and subsequently press the upper one of said two sand mould parts out from its respective moulding chamber
  • the non-contact distance measuring device is arranged to measure the varying distance to the reference patterns of said two sand mould parts subsequently to pressing the upper one of said two sand mould parts out from its respective moulding chamber, but before placing said two sand mould parts on a conveying surface of a conveyor.
  • the sand moulding machine includes a frame positioning device for positioning a holding frame around said two sand mould parts positioned on top of each other and positioned on a conveying surface of a conveyor, and the non-contact distance measuring device is arranged to measure the varying distance to the reference patterns of said two sand mould parts at a position along the path of travel of the compacted sand mould parts before and/or after the frame positioning device. It may be of interest detecting whether the action of positioning a holding frame around said two sand mould parts positioned on top of each other may displace the sand mould parts mutually.
  • the sand moulding machine includes a frame positioning device for positioning a holding frame around said two sand mould parts positioned on top of each other and positioned on a conveying surface of a conveyor, the non-contact distance measuring device is arranged to measure the varying distance to the reference patterns of said two sand mould parts at a position along the path of travel of the compacted sand mould parts at or after the frame positioning device, and the holding frame has an opening through which the non-contact distance measuring device is adapted to measure the varying distance to the reference patterns of said two sand mould parts.
  • the non-contact distance measuring device may even be mounted on and displaced by the frame positioning device.
  • the present invention further relates to a foundry production line including a sand moulding machine as described above, wherein a melt pouring device is adapted for automatic positioning along the path of travel in the conveying direction, and wherein a computer system is adapted to control the position of the melt pouring device on the basis of calculated positions of at least one intersection point between straight lines associated with a number of sand mould parts positioned between the sand moulding machine and the melt pouring device.
  • the melt-pouring device may be accurately positioned in relation to the pouring opening in a sand mould formed by two adjacent sand mould parts, even if the individual dimensions of the sand mould parts positioned between the sand moulding machine and the melt-pouring device vary throughout the process.
  • a set including a number of non-contact distance measuring devices is arranged adjacent the path of travel of the compacted sand mould parts just after the sand moulding machine. Thereby, mutual misalignment of adjacent mould sections and other parameters as mentioned above resulting from the sand moulding process may be detected.
  • a set including a number of non-contact distance measuring devices is arranged adjacent the path of travel of the compacted sand mould parts just before a melt pouring device.
  • mutual misalignment of adjacent mould sections and other parameters as mentioned above resulting from the sand moulding process and resulting from the conveying process may be detected.
  • the parameters related to the conveying process may be detected.
  • a set including a number of non-contact distance measuring devices is arranged adjacent the path of travel of the compacted sand mould parts just after a melt pouring device.
  • mutual misalignment of adjacent mould sections and other parameters as mentioned above resulting from the sand moulding process, the conveying process and the melt pouring process may be detected.
  • the parameters related to the melt pouring process may be detected.
  • a computer system is adapted to control a melt pouring device to stop the pouring of melt on the basis of calculated positions of at least two intersection points between straight lines, and wherein said at least two intersection points are associated with two respective sand mould parts positioned in mutually abutting configuration.
  • the melt pouring device may skip the pouring of melt into moulds which have been evaluated to be faulty. Thereby, it may be avoided that faulty castings are produced for instance as a result of mismatch between sand mould parts.
  • the present invention further relates to a method of producing sand mould parts, whereby a moulding chamber during a filling operation is filled with sand, and whereby the sand is subsequently compacted, the moulding chamber being formed by a chamber top wall, a chamber bottom wall, two opposed chamber side walls and two opposed chamber end walls, whereby the moulding chamber is filled with sand through at least one sand filling opening provided in a chamber wall, whereby a mould or mould part is provided with a pattern by means of at least one of the chamber end walls being provided with a pattern plate having a pattern, and whereby sand is compacted inside the moulding chamber by displacing at least one of the chamber end walls in a longitudinal direction of the moulding chamber, whereby a reference pattern is formed in an external face of a sand mould part by means of at least one reference pattern block associated with and positioned in fixed relationship to at least one of the pattern plates, and whereby a varying distance to the reference patterns of the sand mould parts is
  • the method is characterised by that the at least one reference pattern block forms a reference pattern including at least two flat surfaces following one after the other in the displacement direction, by that each flat surface is arranged at an oblique angle to another one of the flat surfaces, and by that the non-contact distance measuring device measures the varying distance to the at least two flat surfaces of the reference pattern one after the other as they pass relatively the non-contact distance measuring device in succession during the relative displacement in the displacement direction between the compacted sand mould parts and the non-contact distance measuring device.
  • each of said at least two flat surfaces forms an oblique angle with the displacement direction.
  • the oblique angle between two flat surfaces measured externally of the sand mould part is in the range from 95 to 175 degrees or in the range from 185 to 265 degrees, preferably in the range from 115 to 155 degrees or in the range from 205 to 245 degrees, and most preferred in the range from 125 to 145 degrees or in the range from 215 to 235 degrees.
  • the non-contact distance measuring device is a laser-based distance sensor.
  • the non-contact distance measuring device is measuring a distance in a direction at right angles to the displacement direction.
  • At least one of the reference pattern blocks forms a reference pattern in a corner of a sand mould part, whereby said reference pattern includes a first set of at least two flat surfaces following one after the other in the longitudinal direction of the moulding chamber and being arranged at right angles to the chamber top wall, each flat surface of the first set is arranged at an oblique angle to another one of the flat surfaces of the first set, whereby said reference pattern includes a second set of at least two flat surfaces following one after the other in the longitudinal direction of the moulding chamber and being arranged at right angles to the chamber side walls, each flat surface of the second set is arranged at an oblique angle to another one of the flat surfaces of the second set, whereby a first non-contact distance measuring device measures the varying distance to the reference pattern as a result of the at least two flat surfaces of the first set passing relatively the non-contact distance measuring device in succession during the relative displacement in the displacement direction between the compacted sand mould parts and the non-contact distance measuring device, and whereby a second non-contact distance measuring
  • the first non-contact distance measuring device is measuring a distance in a first measuring direction
  • the second non-contact distance measuring device is measuring a distance in a second measuring direction being different from the first measuring direction.
  • the reference pattern block has the form of a fourth of an element combined from at least two truncated square pyramids fitted on top of each other, the top of a lower positioned truncated square pyramid matches the base of a higher positioned truncated square pyramid, and said element has been parted along its centreline and through the symmetry lines of adjacent lateral surfaces of the truncated square pyramids in order to form said fourth.
  • all faces of the reference pattern block contacting sand mould parts are formed with a draft angle in relation to the longitudinal direction of the moulding chamber direction.
  • a computer system receives a number of distance measurements from the non-contact distance measuring device during the relative displacement in the displacement direction between the compacted sand mould parts and the non-contact distance measuring device, whereby the computer system performs curve fitting on the basis of said received distance measurements and thereby estimates the respective positions of a number of straight lines in a coordinate system, each straight line representing a respective one of the at least two flat surfaces of the reference pattern seen in cross-section, and whereby the computer system calculates the position or positions of one or more intersection points between such straight lines.
  • the relative position between the compacted sand mould parts and the non-contact distance measuring device is measured during the relative displacement in the displacement direction between the compacted sand mould parts and the non-contact distance measuring device, and whereby the computer system performs curve fitting and thereby estimates the respective positions of the number of straight lines based additionally on said measurements of the relative position between the compacted sand mould parts and the non-contact distance measuring device.
  • a position sensor performs the measurements of the relative position between the compacted sand mould parts and the non-contact distance measuring device, and the position sensor has the form of an absolute, non-contact position sensor working according to the magnetostrictive principle.
  • a set including a number of non-contact distance measuring devices is mounted on a measuring boom at least partially surrounding the path of travel of the compacted sand mould parts, and wherein the set includes at least a non-contact distance measuring device measuring a distance in a first direction and a non-contact distance measuring device measuring a distance in a second direction being different from the first direction.
  • a conveyor advances the compacted sand mould parts along the path of travel in order to achieve relative displacement in the displacement direction between the compacted sand mould parts and the non-contact distance measuring device.
  • the non-contact distance measuring device is displaced along the path of travel in order to achieve relative displacement in the displacement direction between the compacted sand mould parts and the non-contact distance measuring device.
  • each of the chamber end walls is provided with a pattern plate having a pattern adapted to form a pattern in a sand mould part, and wherein a conveyor advances a number of compacted sand mould parts in aligned and mutually abutting configuration along the path of travel in a conveying direction corresponding to the longitudinal direction of the moulding chamber.
  • the non-contact distance measuring device is arranged stationarily, a position sensor performs the measurements of the relative position between the compacted sand mould parts and the non-contact distance measuring device in the form of the position in the conveying direction of the compacted sand mould parts, and the position sensor is coupled to a so-called Automatic Mould Conveyor (AMC), a so-called Precision Mould Conveyor (PMC) or a so-called Synchronized Belt Conveyor (SBC).
  • AMC Automatic Mould Conveyor
  • PMC Precision Mould Conveyor
  • SBC Synchronized Belt Conveyor
  • a set of non-contact distance measuring devices is arranged along the path of travel of the compacted sand mould parts, whereby the set includes two non-contact distance measuring devices measuring a distance in an at least substantially vertical direction and a distance in an at least substantially horizontal direction, respectively, to a reference pattern in an upper left corner of a sand mould part, two non-contact distance measuring devices measuring a distance in an at least substantially vertical direction and a distance in an at least substantially horizontal direction, respectively, to a reference pattern in an upper right corner of a sand mould part one non-contact distance measuring device measuring a distance in an at least substantially horizontal direction to a reference pattern at or above a lower left corner of a sand mould part, and one non-contact distance measuring device measuring a distance in an at least substantially horizontal direction to a reference pattern at or above a lower right corner of a sand mould part.
  • a further non-contact distance measuring device measures a distance in an upward direction to the reference pattern at or above a lower left corner of a sand mould part, and a further non-contact distance measuring device measures a distance in an upward direction to the reference pattern at or above a lower right corner of a sand mould part.
  • two moulding chambers separated by means of a match plate during the filling operation are filled with sand
  • the sand moulding machine simultaneously compresses two sand mould parts in the respective two moulding chambers and subsequently removes the match plate and positions said two sand mould parts on top of each other thereby forming a complete sand mould
  • the non-contact distance measuring device measures the varying distance to the reference patterns of said two sand mould parts positioned on top of each other.
  • the sand moulding machine performs the following steps in succession:
  • the sand moulding machine by means of a frame positioning device positions a holding frame around said two sand mould parts positioned on top of each other on a conveying surface of a conveyor, and whereby the non-contact distance measuring device measures the varying distance to the reference patterns of said two sand mould parts at a position along the path of travel of the compacted sand mould parts before and/or after positioning of the holding frame around said two sand mould parts.
  • the sand moulding machine by means of a frame positioning device positions a holding frame around said two sand mould parts positioned on top of each other on a conveying surface of a conveyor, whereby the non-contact distance measuring device measures the varying distance to the reference patterns of said two sand mould parts at a position along the path of travel of the compacted sand mould parts during or after positioning of the holding frame around said two sand mould parts, and whereby the non-contact distance measuring device measures the varying distance to said reference patterns through an opening formed in the holding frame.
  • a melt pouring device is automatically positioned along the path of travel in the conveying direction, and the computer system controls the position of the melt pouring device on the basis of calculated positions of at least one intersection point between straight lines associated with a sand mould part positioned between the sand moulding machine and the melt pouring device.
  • a set including a number of non-contact distance measuring devices is arranged adjacent the path of travel of the compacted sand mould parts at one or more of the following positions: just after the sand moulding machine, just before a melt pouring device and just after a melt pouring device.
  • a computer system calculates positions of at least two intersection points between straight lines, whereby said at least two intersection points are associated with two respective sand mould parts positioned in mutually abutting configuration, and whereby the computer system controls a melt pouring device to stop the pouring of melt on the basis of calculated positions.
  • Fig. 2 illustrates a sand moulding machine 1 according to the present invention for the production of sand mould parts 2 illustrated for instance in Fig. 3A and Fig. 5 , adapted to operate according to the vertical flaskless sand moulding technique such as the DISAMATIC (Registered Trademark) technique.
  • the illustrated sand moulding machine 1 includes a moulding chamber 3 formed by a chamber top wall 4, a chamber bottom wall 5, two opposed chamber side walls 6 of which only one is shown and two opposed chamber end walls 7, 8.
  • the chamber top wall 4 is provided with a sand filling opening 9, typically in the form of an elongated opening or a slot extending in the direction between the two opposed chamber side walls 6.
  • Both chamber end walls 7, 8 are provided with a pattern plate 10, 11 having a pattern 12, 13 adapted to form a pattern in a sand mould part 2.
  • Mounting of the pattern plates 10, 11 on the respective chamber end walls 7, 8 may be ensured by not shown pattern plate locks well-known to the person skilled in the art, and accurate positioning of the pattern plates 10, 11 on the respective chamber end walls 7, 8 may in a well-known manner be ensured by means of not shown guide pins fitting in guide bushings 60 as illustrated in Fig. 8 .
  • One or both of the chamber end walls 7, 8 may in a well-known manner be arranged displaceably in a longitudinal direction of the moulding chamber 3 in the direction against each other in order to compact sand fed into the moulding chamber.
  • the first chamber end wall 7 illustrated to the right in Fig. 2 is arranged swingable about a pivot axis 14 in order to open the moulding chamber 3 when a produced sand mould part 2 has to be expelled from the moulding chamber.
  • the pivot axis 14 is furthermore in a well-known manner arranged displaceably in the longitudinal direction of the moulding chamber 3 so that the first chamber end wall 7 may be displaced to the right in the figure and subsequently tilted about the pivot axis 14 by means of a lifting arm 37 pivotally 38 connected to the end wall 7 so that the end wall 7 is located at a level above a produced sand mould part 2, so that the sand mould part 2 may be expelled from the moulding chamber.
  • the sand mould parts 2 may be compacted and subsequently expelled from the moulding chamber 3 by means of a piston 15 arranged to displace the second chamber end wall 8 illustrated to the left in Fig. 2 in the longitudinal direction of the moulding chamber 3.
  • the produced sand mould parts 2 may in a well-known manner be arranged in a row in mutually abutting relationship on a conveyor 16 seen in Fig. 1 .
  • the conveyor 16 is adapted to advance the compacted sand mould parts 2 in aligned and mutually abutting configuration in the longitudinal direction of the moulding chamber 3 along a path of travel 17 shown in Fig. 1 in a conveying direction D as illustrated in Fig. 1 .
  • the sand filling opening 9 of the moulding chamber 3 communicates with a sand feed system 18 including a sand container 19 also illustrated in Fig. 1 .
  • the lower part of the sand container 19 is via a sand conveyor 73 and a sand feed valve , not shown connected with a sand feed chamber, not shown directly connected to the sand filling opening 9 of the moulding chamber 3.
  • the sand feed chamber 72 is internally funnel-formed and well-known to the person skilled in the art.
  • sand provided in the sand feed chamber 72 is so to say “shot” into the moulding chamber 3 through the sand filling opening 9 by closing the sand feed valve 20 and opening a not shown sand feed control valve so that compressed air enters the sand feed chamber 72 and presses the sand through the sand filling opening 9.
  • an amount of compacted sand is still closing the sand filling opening 9 until the next "shot” of sand enters the moulding chamber through the sand filling opening 9.
  • Fig. 1 illustrates a foundry production line 21 including the sand moulding machine 1 illustrated in Fig. 2 and described above, the conveyor 16, a measuring boom 41 and a melt pouring device 22 adapted for automatic positioning along the path of travel 17 in the conveying direction D and for automatic pouring.
  • a sand moulding machine control panel 71 is provided for the control of the sand moulding machine 1.
  • a computer system 23 is connected to the measuring boom 41 and the melt pouring device 22 as will be further discussed below.
  • each pattern plate 10, 11 is associated with four reference pattern blocks 24, 25, 26, 27 being positioned in fixed relationship to the pattern 12, 13 of said pattern plate 10, 11 and being adapted to form a corresponding reference pattern 28, 29, 30, 31 in an external face 32, 33, 34, 35, 36 of a sand mould part 2, which is illustrated in Fig. 3A .
  • the reference pattern blocks 24, 25, 26, 27 may be positioned on a respective pattern plate 10, 11 by means of bolts. Accurate positioning in said fixed relationship may be ensured by means of not shown guide pins fitting in not shown holes formed either in the reference pattern blocks 24, 25, 26, 27 or in the pattern plates 10, 11 and the guide pins may be mounted on the other corresponding part.
  • Each reference pattern block 24, 25, 26, 27 includes at least one set of three flat faces L, M, N following one after the other in the conveying direction D (see Fig. 6 ) and being adapted to form a corresponding reference pattern 28, 29, 30, 31 including at least one set of three flat surfaces I, m, n following one after the other in the conveying direction D as illustrated in Fig. 10 and as explained in further detail below.
  • each flat surface I, m, n is arranged at an oblique angle to another one of the flat surfaces I, m, n. This means that two of the flat surfaces I, m, n may be parallel, but of course not all of them.
  • non-contact distance measuring devices 39 in the form of laser-based distance sensors L1, L2, L3, L4, L5, L6 are arranged stationarily on the measuring boom 41 adjacent the path of travel 17 of the compacted sand mould parts 2.
  • the laser-based distance sensors L1, L2, L3, L4, L5, L6 are adapted to measure a varying distance to the reference patterns 28, 29, 30, 31 at a measuring position 40 along the conveying direction D as a result of the flat surfaces I, m, n passing the measuring position 40 in succession during the advancement in the conveying direction D of the compacted sand mould parts 2.
  • the measuring boom 41 with the non-contact distance measuring devices 39 may be arranged displaceably along the path of travel 17 in the conveying direction D in order to achieve relative displacement in the displacement direction 82 between the compacted sand mould parts 2 and the non-contact distance measuring devices 39.
  • the compacted sand mould parts 2 do not need to be displaced along the path of travel 17 when distance measurements are performed by means of the non-contact distance measuring devices 39.
  • Non-contact distance measuring devices are preferred as high accuracy may not be obtained with mechanical measuring probes due to the strength properties of the compressed mould.
  • the laser-based distance sensors L1, L2, L3, L4, L5, L6 are illustrated as boxes, and the laser beams are indicated as broken lines pointing from said boxes in the respective measuring directions.
  • each corner reference pattern 28, 29 includes a first set 42 of three flat surfaces l 1 , m 1 , n 1 following one after the other in the conveying direction D and being arranged at right angles to the chamber top wall 4. This is understood by comparing Figs. 2 , 3 and 10 .
  • Each flat surface l 1 , m 1 , n 1 of the first set 42 is arranged at an oblique angle to another one of the flat surfaces of the first set.
  • Each corner reference pattern 28, 29 furthermore includes a second set 43 of three flat surfaces l 2 , m 2 , n 2 following one after the other in the conveying direction D and being arranged at right angles to the chamber side walls 6. This is also understood by comparing Figs. 2 , 3 and 10 .
  • Each flat surface l 2 , m 2 , n 2 of the second set 43 is arranged at an oblique angle to another one of the flat surfaces of the second set.
  • the corner reference pattern block 24 used to form the corner reference pattern 28 is illustrated in Fig. 6 . It is seen that the corner reference pattern block 24 has a first set 44 of three flat faces L 1 , M 1 , N 1 arranged vertically, at right angles to the chamber top wall 4, and adapted to form the corresponding first set 42 of three flat surfaces l 1 , m 1 , n 1 in the sand mould part 2 as illustrated in Fig. 10 .
  • the corner reference pattern block 24 has a second set 45 of three flat faces L 2 , M 2 , N 2 arranged at right angles to the chamber side walls 6 and adapted to form the corresponding second set 43 of three flat surfaces l 2 , m 2 , n 2 in the sand mould part 2 similar to what is illustrated in Fig. 10 .
  • the size of the corner reference pattern block 24 may for instance be 40x40x40 millimetres, 30x30x30 millimetres or 20x20x20 millimetres. A relatively smaller size may be advantageous, but may provide less accuracy than a relatively larger size.
  • each side reference pattern 30, 31 includes a set of three flat surfaces I, m, n following one after the other in the conveying direction D and being arranged at right angles to the chamber top wall 4. This is understood by comparing Figs. 2 , 3 and 8 .
  • Each flat surface I, m, n is arranged at an oblique angle to at least another one of the flat surfaces.
  • the side reference pattern block 26 is illustrated in Fig. 9 . As it is seen, the flat surfaces I, m, n of the side reference pattern 30, 31 corresponds to the flat surfaces l 1 , m 1 , n 1 of the first set 42 of the corner reference patterns 28, 29.
  • the laser-based distance sensor L1 is arranged to measure the varying distance in horizontal direction to the corner reference patterns 28, 29 formed in the top right side of the string of compacted sand mould parts 2, seen in the conveying direction D of the compacted sand mould parts 2, as a result of the three flat surfaces l 1 , m 1 , n 1 of the first set 42 passing the measuring position 40 in succession during the advancement in the conveying direction D.
  • the laser-based distance sensor L3 is arranged to measure the varying distance in vertical direction to the reference patterns 28, 29 formed in the top right side of the string of compacted sand mould parts 2, seen in the conveying direction D of the compacted sand mould parts 2, as a result of the three flat surfaces l 2 , m 2 , n 2 of the second set 43 passing the measuring position 40 in succession during the advancement in the conveying direction D.
  • the laser-based distance sensor L2 is arranged to measure the varying distance in horizontal direction to the corner reference patterns 28, 29 formed in the top left side of the string of compacted sand mould parts 2, seen in the conveying direction D of the compacted sand mould parts 2, as a result of the three flat surfaces l 1 , m 1 , n 1 of the first set 42 passing the measuring position 40.
  • the laser-based distance sensor L4 is arranged to measure the varying distance in vertical direction to the reference patterns 28, 29 formed in the top left side of the string of compacted sand mould parts 2, seen in the conveying direction D of the compacted sand mould parts 2, as a result of the three flat surfaces l 2 , m 2 , n 2 of the second set 43 passing the measuring position 40.
  • the laser-based distance sensor L5 is arranged to measure the varying distance in horizontal direction to the side reference patterns 30, 31 formed in the right side of the string of compacted sand mould parts 2, seen in the conveying direction D of the compacted sand mould parts 2, as a result of the three flat surfaces I, m, n passing the measuring position 40.
  • the laser-based distance sensor L6 is arranged to measure the varying distance in horizontal direction to the side reference patterns 30, 31 formed in the left side of the string of compacted sand mould parts 2, seen in the conveying direction D of the compacted sand mould parts 2, as a result of the three flat surfaces I, m, n passing the measuring position 40.
  • the upper reference pattern blocks 24, 25 have been described as corner reference pattern blocks 24, 25 as the one illustrated in Fig. 6
  • the lower reference pattern blocks 26, 27 have been described as side reference pattern blocks 26, 27 as the one illustrated in Fig. 9
  • other embodiments are possible. In fact, only one single reference pattern block on either pattern plate is necessary in order to detect a misalignment between sand mould parts. However, especially, it could be preferred to arrange additionally the lower reference pattern blocks 26, 27 as corner reference pattern blocks as the one illustrated in Fig.
  • the lower reference pattern blocks 26, 27 could be arranged as corner reference pattern blocks as the one illustrated in Fig. 6 , but positioned as lower blocks at a distance from the chamber bottom wall 5, just like the lower reference pattern blocks 26, 27 illustrated in Fig. 8 .
  • a further non-contact distance measuring device 39 could be arranged to measure a distance obliquely in an upward or downward direction to the lower corner reference pattern at or above the lower left corner of the sand mould part 2, and a further non-contact distance measuring device 39 could be arranged to measure a distance obliquely in an upward or downward direction to the lower corner reference pattern at or above the lower right corner of the sand mould part 2.
  • Suitable non-contact distance measuring devices are available from the company SICK AG, Germany, in the form of short range distance sensors utilizing laser technology. Other suitable non-contact distance measuring devices based on other measuring technologies may also be employed according to the invention.
  • each of the three flat surfaces I, m, n of the reference patterns 28, 29, 30, 31 forms an oblique angle with the conveying direction.
  • the accuracy of the detected parameters may be improved, as the flat surfaces of the reference pattern may be better released from the reference pattern block and may therefore be formed more accurately in the sand mould part.
  • the reference pattern block may be less worn during use which may also mean better accuracy in the long run.
  • the distance measurements may be more precise, when the distance is gradually increasing or gradually decreasing as opposed to being constant.
  • the reason may have to do with the fact that the laser beam has a certain diameter, such as approximately 1 millimetre, and that the surface of the reference pattern has a certain grainy structure formed by sand grains. Furthermore, it may have to do with internal tolerances of the laser-based distance sensor.
  • all faces of the reference pattern blocks intended to contact sand mould parts 2 are formed with a draft angle in relation to the longitudinal direction of the moulding chamber 3in order to better release the reference pattern blocks from the sand mould parts 2.
  • the oblique angle between two flat surfaces measured externally of the sand mould part is in the range from 95 to 175 degrees or in the range from 185 to 265 degrees, preferably in the range from 115 to 155 degrees or in the range from 205 to 245 degrees, and most preferred in the range from 125 to 145 degrees or in the range from 215 to 235 degrees.
  • the angle ⁇ is approximately 125 degrees
  • the angle ⁇ is approximately 215 degrees.
  • the non-contact distance measuring devices 39 are arranged to measure a distance in a direction at right angles to the conveying direction D.
  • the laser-based distance sensor L1 could be arranged to measure a distance in horizontal direction, but at an oblique angle to the conveying direction D, and the measured distance could, for instance in a computer programme, be projected onto a direction at right angles to the conveying direction D.
  • the non-contact distance measuring devices 39 are arranged to measure a distance in an at least substantially horizontal direction or a distance in an at least substantially vertical direction. It is most practical to calculate and represent distances in a coordinate system having axes corresponding to the faces 32, 34, 35 of the sand mould parts 2 arranged on the conveyor 16. Although distances measured in other directions may be projected onto such axes, this may complicate calculations.
  • a corner reference pattern block 24, 25 may have the form of a fourth of an element 46 combined from three truncated square pyramids 47, 48, 49 fitted on top of each other.
  • the top of a relatively lower positioned truncated square pyramid 47 matches the base of the relatively higher positioned truncated square pyramid 48
  • the top of the relatively lower positioned truncated square pyramid 48 matches the base of the relatively higher positioned truncated square pyramid 49.
  • the latter may simply be regarded as a slice of the element 46 combined from three truncated square pyramids 47, 48, 49 fitted on top of each other as illustrated in Fig. 7 .
  • the slice may be formed by performing two parallel cuts forming parallel side faces 51 on either side of a symmetry line 50 of adjacent lateral surfaces of the truncated square pyramids 47, 48, 49 and by performing one cut through the centreline of the element 46 and at right angles to the parallel side faces 51 to form a face 52.
  • two side reference pattern blocks 26 as illustrated in Fig. 9 each being differently formed with differently angled flat faces L, M, N, may be combined to one corner reference pattern block 24 as illustrated in Fig. 6 .
  • the side faces 53 of the corner reference pattern blocks 24, 25 may be positioned at a small distance, for instance 1/10 or 1/2 millimetre, from the adjacent chamber top wall 4 and the adjacent chamber side walls 6, respectively, in order to minimize wear.
  • the side faces 52 of the side reference pattern blocks 26, 27 may be at a small distance, for instance 1/10 or 1/2 millimetre, from the adjacent chamber side walls 6 in order to minimize wear.
  • the lower side face 51 of the side reference pattern blocks 26, 27 may typically be placed at a distance from the chamber bottom wall 5. Said distance may for instance correspond to the width of, or half the width of, a side reference pattern block 26, 27, between its side faces 51.
  • the computer system 23 illustrated in Fig. 1 is adapted to receive a number of distance measurements from the non-contact distance measuring devices 39 arranged on the measuring boom 41 during the advancement in the conveying direction D of a compacted sand mould part 2.
  • the computer system 23 is adapted to perform curve fitting on the basis of said received distance measurements and thereby estimate the respective positions of three straight lines in a coordinate system as illustrated in Figs. 11 and 12 , wherein each straight line represents a respective one of the three flat surfaces I, m, n of the reference pattern 28, 29, 30, 31 seen in cross-section.
  • the computer system 23 is adapted to calculate the positions of two intersection points A, B between the straight lines representing the flat surfaces I, m, n.
  • the position of the intersection points A, B may be compared to the ideal position of the intersection points. Thereby, mutual misalignment of adjacent sand mould parts may be detected very accurately.
  • distance measurements relating to different reference patterns 28, 29, 30, 31 both vertical, lateral and rotational mutual misalignment of adjacent sand mould parts may be detected.
  • width of a possible gap between adjacent sand mould parts, mould expansion and mould dimensions may be detected by this arrangement.
  • each reference pattern block 24, 25, 26, 27 includes at least one set of three flat faces (L, M, N) following one after the other in the conveying direction D
  • a set of two flat faces may be enough, for instance if only sand mould misalignment should be detected.
  • the determination of one intersection point A for each one of two abutting sand mould parts will be sufficient.
  • at least one set of three flat faces (L, M, N) following one after the other in the conveying direction D is necessary. This will be understood more clearly by the explanation further below.
  • Fig. 11 illustrates the measurements of the laser-based distance sensors L1, L2 as a sand mould part 2 passes the measuring position 40.
  • the directions of the laser-based distance sensors L1, L2 are indicated in relation to the sand mould parts 2 in Figs. 3A and 3B .
  • the x coordinates on the curves are based on measurements done by a position sensor in displacement direction D illustrated in Fig. 5 .
  • the centre of the mould string in the traverse direction is zero point for the sensors L1 and L2 i.e. one is giving positive values and the other negative values.
  • Fig. 12 illustrates a detail XII of Fig. 11 which detail illustrates the measurement of the laser-based distance sensor L1 as a corner reference pattern 28 passes the measuring position 40. Comparing Fig.
  • each of the flat surfaces l 1 , m 1 , n 1 of the first set 42 of the corner reference pattern 28 is represented by a straight line in the coordinate system.
  • an end face 57 of the corner reference pattern 28 and an external face 32 of the sand mould part 2 are also represented by corresponding lines in the coordinate system.
  • the straight lines representing the flat surfaces l 1 , m 1 , n 1 have been positioned correctly in the coordinate system by the computer system 23 by curve fitting of a number of measuring points supplied to the computer system 23 from the laser-based distance sensor L1. The number of measuring points necessary to position a straight line with suitable accuracy may vary.
  • the number of measuring points necessary to position one of the straight lines l 1 , m 1 , n 1 could be between 5 and 50 or maybe even more, such as 100. However, it may be preferred to use between 10 and 30 or between 15 and 25 measuring points to position one of the straight lines l 1 , m 1 , n 1 . A relatively large number of measuring points may provide relatively high accuracy; however calculations may then slow down the process of curve fitting.
  • the computer system 23 has calculated the correct position of the intersection point A 1 between the straight lines representing the flat surfaces l 1 , m 1 and the correct position of the intersection point B 1 between the straight lines representing the flat surfaces m 1 , n 1 in the coordinate system illustrated in Fig. 12 .
  • corresponding curve fitting operations and calculations are performed for the other laser-based distance sensors L2, L3, L4, L5, L6.
  • the straight lines representing the flat surfaces may be correctly positioned in a coordinate system by the computer system by adapting the slopes of the straight lines to the known slopes of the corresponding flat surfaces of the reference pattern.
  • the slopes of the corresponding flat surfaces of the reference pattern correspond to the slopes of the corresponding faces of reference pattern block.
  • inaccuracies may occur; for instance the velocity of the sand mould parts 2 may vary slightly, although assumed constant.
  • the sand mould parts 2 may for instance accelerate as they are expelled from the moulding chamber 3.
  • the computer system 23 is adapted to, by means of curve fitting, estimate the respective positions of the straight lines based additionally on measurements of the position in the conveying direction D of the compacted sand mould parts 2 during the advancement in the conveying direction of the compacted sand mould parts 2. Thereby, a number of points may be plotted in a coordinate system based on pairs of corresponding measured position in the conveying direction D and measured distance to a reference pattern. By curve fitting, a straight line may be estimated on the basis of these points.
  • the measurements of the position in the conveying direction D of the compacted sand mould parts 2 may be performed by means of a position sensor 55 coupled to the conveyor 16.
  • the conveyor 16 may have the form of a so-called Automatic Mould Conveyor (AMC) which conveys the compacted sand mould parts 2 by means of pneumatically operated longitudinally extending gripping elements 54 (also called thrust bars) arranged on either side of the string of the aligned and mutually abutting compacted sand mould parts 2 as illustrated in Figs. 4 and 5 .
  • the gripping elements 54 moves back and forth and grip on either side of the compacted sand mould parts 2 as these are advanced.
  • Pairs of gripping elements 54 arranged on either side of the path of travel 17, respectively, are mutually connected by means a traverse 61.
  • the traverse 61 is connected to each gripping element 54 by means of a connecting arrangement 62.
  • a not shown pneumatic expansion element is arranged between the connecting arrangement 62 and the respective gripping element 54 in order to press the gripping elements at either side of the path of travel 17 against the compacted sand mould parts 2.
  • Neighbouring gripping elements 54 in the conveying direction D are connected by means of a not shown flexible coupling.
  • Each gripping element 54 may have a length of for instance 1 metre.
  • the foremost gripping elements 54 are actuated back and forth by means of an actuator, such as a hydraulic actuator.
  • the conveyor 16 may alternatively have the form of a so-called Precision Mould Conveyor (PMC) which conveys the compacted sand mould parts 2 by means of sets of so-called walking beams moving back and forth below the compacted sand mould parts 2 or by means of any other suitable device for transporting the mould string.
  • PMC Precision Mould Conveyor
  • the position sensor 55 may preferably be an absolute, non-contact position sensor working according to the magnetostrictive principle. Suitable position sensors of this type are marketed by the company MTS (registered trademark) under the trade name Temposonics (registered trademark). Other suitable position sensors may also be employed according to the invention. As illustrated in Fig. 5 , the position sensor 55 may have a measuring bracket 56 adapted to be mounted on a longitudinally extending gripping element 54 of the conveyor 16.
  • a magnetic position giving element 63 is by means of a slide 65 arranged slidably on two adjacent fixed rods 64 so that it is fixed in transverse directions in relation to the sliding direction, and the slide 65 is flexibly connected with the gripping element 54 in order to allow transverse movements in relation to the conveying direction D.
  • Said flexibly connection is achieved in that the measuring bracket 56 has a sliding element 66 slidably arranged in a downward open groove 67 formed in the slide 65 and extending in a transverse direction in relation to the sliding direction.
  • the position of the magnetic position giving element 63 is detected by a measuring rod 68.
  • a gripping element 54 on either side of the path of travel 17 at the measuring position 40 is provided with a through going groove 70 in order to allow the lowermost laser-based distance sensors L5, L6 to measure a distance to the respective side reference patterns 30, 31 of the compacted sand mould parts 2.
  • the through going groove 70 has a length in the longitudinal direction of the gripping elements 54 of at least the stroke of the back and forth going movement of the gripping elements 54.
  • the arrangement of the through going grooves 70 has been done in order to allow a relatively low positioning of the lowermost laser-based distance sensors L5, L6 which may allow for a more accurate detection of for instance misalignments.
  • the lowermost laser-based distance sensors L5, L6 and the respective side reference patterns 30, 31 could be arranged above the upper edge of the gripping element 54 (or possibly below the lower edge of the gripper element 54 in the case it was mounted higher).
  • the position sensor 55 may be a laser-based distance sensor measuring the distance to an external end face 35 of the lastly expelled sand mould part 2.
  • a number of important variables may be calculated on the basis thereof. For instance, by comparing the respective positions along the y axis as indicated in Figs. 3 and 12 of two intersection points A 1 for two respective mutually abutting compacted sand mould parts 2, a possible mutual horizontal misalignment of these adjacent sand mould parts 2 may be detected very accurately. On the other hand, by comparing the respective positions along the x axis as indicated in Figs.
  • Fig. 15 shows an experimental result of calculations of mould gap based on respective measurements performed by the two laser-based distance sensors L1, L2 as indicated in Figs. 3A and 3B for 43 different sand mould parts.
  • the lines 58, 59 indicate calculated respective mean values for the mould gap based on measurements performed by the two laser-based distance sensors L1, L2.
  • a positive value indicate an opening between external end faces 35, 36
  • a negative value indicate that the external end faces 35, 36 may have been pressed too forcefully against each other.
  • the close up force used when bringing the last produced sand mould part in contact with the mould string and during mould transport may be adjusted.
  • the calculated values for the mould gap for the two laser-based distance sensors L1, L2 generally follow each other. However, for some sand mould parts, the values differ. This may be the result of noise during measurements, but it may also be the result of a misalignment of the pattern plates 10, 11 so that they are not parallel. The measurements may therefore be used to indicate that an adjustment of the alignment of the pattern plates 10, 11 may be necessary.
  • Fig. 13 shows an experimental result of calculations of sand mould thickness based on measurements by the respective laser-based distance sensors L1, L2 for a number of 40 different sand mould parts.
  • the results document that good accuracy may be obtained by the sand moulding machine according to the invention, because as expected sand mould thickness is varying between different sand mould parts, but on the other hand, calculations of sand mould thickness based on measurements by the different laser-based distance sensors L1, L2 generally vary only little.
  • Fig. 14 shows an experimental result of calculations of positions along the y axis as indicated in Figs. 3 and 12 of two respective intersection points A 1 for respective corner reference patterns 28, 29 based on measurements performed by laser-based distance sensors L1, L2, respectively.
  • the calculated values for the positions along the y axis based on measurements by the two laser-based distance sensors L1, L2 generally follow each other which is expected as the width of the sand mould parts should be close to constant and variations come basically only from the mould string moving a little forth and back in the sidewise direction on the transport system during a production run.
  • said two values vary along the string of sand mould parts, but generally follow each other, this may indicate accumulations of minor misalignments between the individual sand mould parts. However, for some sand mould parts, said two values differ. This may be the result of noise during measurements or it could indicate other conditions that could be investigated.
  • a set including six non-contact distance measuring devices 39 in the form of laser-based distance sensors L1, L2, L3, L4, L5, L6 is arranged on the measuring boom 41 adjacent the path of travel 17 of the compacted sand mould parts 2 as illustrated in Fig. 4 .
  • the boom 41 with the set of non-contact distance measuring devices 39 may be arranged at different positions along the path of travel 17, and one or more such booms may be arranged at different positions along the path of travel 17.
  • the boom 41 is arranged between the sand moulding machine 1 and the melt pouring device 22. It may be advantageous arranging the boom 41 just before, and possibly relatively near or next to, the melt pouring device 22. In this way, the melt pouring device 22 may be controlled by the computer system 23 to not pour melt into a mould cavity between sand mould parts being misaligned or in any other way not correctly produced. Thereby, it may be avoided that faulty castings are made.
  • boom 41 or an additional boom 41 just after, and possibly relatively near or next to, the sand moulding machine 1 in order to be able to take inaccuracies into consideration as early as possible.
  • any inaccuracies at or before the melt pouring device 22 may not be detected before the castings have cooled down and are removed from the sand moulds.
  • a string of for instance 300 or more sand moulds located downstream, that is after, the melt pouring device 22 it could take a long time before any inaccuracies would be detected by inspection of the cooled down castings at the end of such string. Therefore, in that case, more than 300 castings would have to be scrapped if there were only one casting in each mould.
  • patterns for sand moulds with several casting cavities are used; meaning for instance a pattern with four cavities would result in 1200 defective castings having to be scrapped.
  • the foundry production line 21 illustrated in Fig. 1 including the sand moulding machine 1 the melt pouring device 22 is adapted for automatic positioning along the path of travel 17 in the conveying direction D.
  • the computer system 23 is adapted to control the position of the melt pouring device 22 on the basis of calculated positions of at least one intersection point A, B between straight lines I, m, n associated with a sand mould part 2 positioned between the sand moulding machine 1 and the melt pouring device 22.
  • the position of the melt pouring device 22 may be calculated on the basis of calculated positions of a single or two intersection points A, B relating to the sand mould part 2 positioned immediately before or just before the melt pouring device 22. If, however, a boom 41 is arranged for instance just after the sand moulding machine 1, the position of the melt pouring device 22 may be calculated and controlled on the basis of accumulated calculated mould thicknesses for the several produced sand mould parts 2 positioned on the conveyor 16 between the sand moulding machine 1 and the melt pouring device 22. For instance, a number of 10, 20 or even more produced sand mould parts 2 may be positioned between the sand moulding machine 1 and the melt pouring device 22.
  • the foundry production line 21 illustrated in Fig. 1 includes the sand moulding machine 1, the conveyor 16, a measuring boom 41, a melt pouring device 22 and the computer system 23, for the sake of definitions used in the claims, it may also be considered so that the sand moulding machine 1 includes one or all of the conveyor 16, the measuring boom 41, the melt pouring device 22 and the computer system 23.
  • Fig. 16 and 17 illustrate another embodiment of the sand moulding machine 75 according to the invention.
  • the sand moulding machine 75 operates according to the horizontal flaskless match plate technique.
  • the sand moulding machine 75 includes two not shown moulding chambers separated by means of a not shown match plate, and the sand moulding machine is adapted to simultaneously compress two sand mould parts 76, 77 in the respective two moulding chambers and subsequently remove the match plate and position said two sand mould parts 76, 77 on top of each other to form a complete sand mould as best seen in Fig. 17 .
  • the moulding chambers are so positioned that the match plate is oriented vertically when the moulding chambers are filled with sand and the sand is mechanically compacted by displacement of chamber end walls. Subsequently, the moulding chambers are rotated 90 degrees, the match plate is removed and the two sand mould parts 76, 77 are placed on top of each other. A sand moulding machine door 78 is opened, and the two sand mould parts 76, 77 are placed on a conveyor 74. Therefore, when the two sand mould parts 76, 77 are placed on the conveyor 74, they abut each other along a horizontal parting line 84.
  • melt may be poured into the complete sand mould through a mould inlet 83 in the upper sand mould part 77.
  • the sand mould parts 2 abut each other along vertical parting lines.
  • non-contact distance measuring devices 39 in the form of laser-based distance sensors L1', L2', L3', L4', L5', L6', L7', L8' are arranged on a measuring boom 80 to measure the varying distance to reference patterns 81 of said two sand mould parts 76, 77 positioned on top of each other.
  • the measuring boom 80 with the non-contact distance measuring devices 39 is displaced up or down in the displacement direction 82 which in this case is the vertical direction, as illustrated with an arrow in the figure.
  • the measuring boom 80 is arranged vertically displaceable on a measuring pole 79.
  • distance measurement is performed by vertical displacement of the measuring boom 80, when the two sand mould parts 76, 77 have been placed on the conveyor 74.
  • a relative displacement in the displacement direction 82 between the compacted sand mould parts 76, 77 and the non-contact distance measuring devices 39 is achieved.
  • the relative displacement in the displacement direction 82 between the compacted sand mould parts 76, 77 and the non-contact distance measuring devices 39 is achieved by displacement of the compacted sand mould parts 76, 77 vertically in relation to the measuring boom 80.
  • the measuring boom 80 with the non-contact distance measuring devices 39 is arranged to measure the varying distance to the reference patterns 81 of said two sand mould parts 76, 77 subsequently to pressing the upper one 77 of said two sand mould parts out from its respective moulding chamber, but before placing said two sand mould parts 2 on a conveying surface of the conveyor 74.
  • the relative displacement in the displacement direction 82 between the compacted sand mould parts 76, 77 and the non-contact distance measuring devices 39 may thereby be achieved by displacement of the compacted sand mould parts 76, 77 vertically in relation to the measuring boom 80.
  • the measuring boom 80 could in this case also be arranged vertically displaceable in order to provide at least part of the relative displacement.
  • the sand moulding machine 75 includes a not shown frame positioning device for positioning a not shown holding frame, a so called jacket, around said two sand mould parts 76, 77 positioned on top of each other on a conveying surface of the conveyor 74.
  • the positioning of said holding frame around said two sand mould parts 76, 77 is well-known to the person skilled in the art and is done in order to maintain the two sand mould parts 76, 77 in correct mutual position during casting.
  • the measuring boom 80 with the non-contact distance measuring devices 39 is arranged to measure the varying distance to the reference patterns 81 of said two sand mould parts 76, 77 at a position along the path of travel 17 of the compacted sand mould parts 76, 77 before and/or after the frame positioning device. It may be of interest detecting whether the action of positioning a holding frame around said two sand mould parts positioned on top of each other may displace the sand mould parts mutually.
  • the holding frame has an opening through which the non-contact distance measuring device 39 is adapted to measure the varying distance to the reference patterns 81 of said two sand mould parts 76, 77. Thereby, it may be possible to perform distance measurement during or after positioning the holding frame around said two sand mould parts. If the distance measurement is performed during said positioning of the holding frame, the non-contact distance measuring device may even be mounted on and displaced by the frame positioning device.
  • the non-contact distance measuring devices 39 are arranged on a measuring boom 41, 80, the arrangement of the non-contact distance measuring devices 39 may be in any suitable way, for instance each non-contact distance measuring device 39 may be arranged on a separate holding pole.
  • a computer system 23 is adapted to control a melt pouring device 22 to stop the pouring of melt on the basis of calculated positions of at least two intersection points A, B between straight lines, and wherein said at least two intersection points A, B are associated with two respective sand mould parts 2, 76, 77 positioned in mutually abutting configuration.

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  • Mechanical Engineering (AREA)
  • Length Measuring Devices By Optical Means (AREA)
  • Casting Devices For Molds (AREA)
EP15731712.4A 2015-06-04 2015-06-04 Sand moulding machine and method of producing sand mould parts Active EP3328573B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL15731712T PL3328573T3 (pl) 2015-06-04 2015-06-04 Maszyna do formowania w masie formierskiej i sposób wytwarzania części z formy piaskowej

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/IB2015/054231 WO2016193789A1 (en) 2015-06-04 2015-06-04 Sand moulding machine and method of producing sand mould parts

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EP3328573A1 EP3328573A1 (en) 2018-06-06
EP3328573B1 true EP3328573B1 (en) 2019-10-30

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EP (1) EP3328573B1 (es)
CN (1) CN107848022B (es)
ES (1) ES2765407T3 (es)
PL (1) PL3328573T3 (es)
WO (1) WO2016193789A1 (es)

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3729047A (en) * 1972-01-28 1973-04-24 Idra Pressen Gmbh Die-casting machine
US4774751A (en) * 1981-06-15 1988-10-04 Diffracto, Ltd. Electro-optical and robotic casting quality assurance
US4724894A (en) * 1986-11-25 1988-02-16 Selective Electronic, Inc. Molten metal pour control system
US4724886A (en) 1986-11-25 1988-02-16 Selective Electronic, Inc. Mold cavity misalignment detection system
JPH04190964A (ja) * 1990-11-22 1992-07-09 Aisin Takaoka Ltd 無枠式鋳造ライン
JP2798191B2 (ja) * 1991-03-22 1998-09-17 新東工業株式会社 無枠鋳型造型設備
DE4202020A1 (de) * 1992-01-25 1993-07-29 Abb Patent Gmbh Verfahren und anordnung zur positionierung eines giesssystems bei einem ballenpressenden form- und foerdersystem
DK174296B1 (da) 1994-11-18 2002-11-25 Dansk Ind Syndikat Fremgangsmåde ved drift af forme- og støbeanlæg, samt anlæg til brug ved fremgangsmådens udøvelse
ATE182494T1 (de) * 1995-06-07 1999-08-15 Inductotherm Corp Videosystem zur positionierung einer giesspfanne
WO2011089585A1 (en) * 2010-01-25 2011-07-28 Disa Industries A/S Moulding chamber arrangement for a mould-string plant

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None *

Also Published As

Publication number Publication date
CN107848022B (zh) 2019-06-11
CN107848022A (zh) 2018-03-27
ES2765407T3 (es) 2020-06-09
PL3328573T3 (pl) 2020-05-18
EP3328573A1 (en) 2018-06-06
WO2016193789A1 (en) 2016-12-08

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