CA2695585A1 - Method and mould closure for an injection moulding machine with a tool clamping plate - Google Patents
Method and mould closure for an injection moulding machine with a tool clamping plate Download PDFInfo
- Publication number
- CA2695585A1 CA2695585A1 CA2695585A CA2695585A CA2695585A1 CA 2695585 A1 CA2695585 A1 CA 2695585A1 CA 2695585 A CA2695585 A CA 2695585A CA 2695585 A CA2695585 A CA 2695585A CA 2695585 A1 CA2695585 A1 CA 2695585A1
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- Canada
- Prior art keywords
- tool clamping
- clamping plate
- mould closure
- tool
- mould
- 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.)
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/1742—Mounting of moulds; Mould supports
- B29C45/1744—Mould support platens
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
- B23P15/007—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass injection moulding tools
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C33/00—Moulds or cores; Details thereof or accessories therefor
- B29C33/30—Mounting, exchanging or centering
- B29C33/305—Mounting of moulds or mould support plates
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
Abstract
The invention relates to a device and a method for injection moulding machines with a tool clamping plate (3). Through the enormous mould closure forces, in particular the tool clamping plate on the nozzle side is deformed or respectively deflected up to one millimetre. This leads to high mechanical stresses in the injection tools. The new invention now proposes at least partially deflecting or elastically deforming the tool clamping plate (3), which is on the nozzle side and/or is movable, in terms of the mould closure forces, on a processing table, and carrying out a flat processing in the region of the tool clamping surface (17) under the deformation force.
Description
DESCRIPTION
METHOD AND MOULD CLOSURE FOR AN INJECTION MOULDING
MACHINE WITH A TOOL CLAMPING PLATE
TECHNICAL FIELD
The invention relates to a method for achieving as high a plane parallelism as possible of the tool clamping surface, in particular of the tool clamping plate on the nozzle side of injection moulding machines, in the operating state under the mould closure forces which engage on the tool clamping plate via rails outside the mould region. The invention further relates to a mould closure of an injection moulding machine with tool clamping plates which are deflected or deformed under the mould closure forces.
PRIOR ART
The invention relates to the type of injection moulding machines with rails. The great advantage of the rail machine lies in that the forces are closed onto the two tool clamping plates via at least four rails arranged in the outermost corners of the four-cornered tool clamping plate in longitudinal direction of the injection moulding machine. In the past, the tool clamping plates were produced as solid cast bodies which weighed tons. The two mould halves were also solid in construction. In the course of the ongoing improvements to material usage, both the tool clamping plates and also the moulding tools themselves were constructed increasingly lighter. Independently thereof, however, the requirements increased relating to the closure forces, whether due to process or due to ever larger moulds in multiple injection moulds. It is interesting that the relatively small moulds, for example for the production of cans or buckets, produce the greatest problems. If the force is introduced via engagement points on the outer corners, the tool clamping plate on the nozzl.e side easily deflects in the case of tools in which the principal forces occur in the centre. This is very harmful for the tools and is disadvantageous for the i_njection moulding process.
The entire development led in a sense to a conflict of aims:
= Independently of the mould size, in every case the best qualities are required of the injection moulded articles.
= Regardless of aiming for a lighter construction of the entire injection moulding machine, the mould manufacturer, precisely under the highest required injection moulding pressures or closing forces for the moulds, expects that the clamping plates do not deflect or that these remain as far as possible absolutely plane-parallel. In particular, the forces from the rails lying on the outside should not stand out on the flat tool clamping surface of the tools or moulds.
= As in several cases of application, not only a quite specific mould size but also the most varied mould dimensions are used in the same machine, it is required that the forces onto the mould halves are transmitted uniformly for the smallest and largest moulds or tools in the central region.
This is in the case of small injection moulding machines of for example 50 t up to large injection moulding machines of 1000 t and more closure force.
METHOD AND MOULD CLOSURE FOR AN INJECTION MOULDING
MACHINE WITH A TOOL CLAMPING PLATE
TECHNICAL FIELD
The invention relates to a method for achieving as high a plane parallelism as possible of the tool clamping surface, in particular of the tool clamping plate on the nozzle side of injection moulding machines, in the operating state under the mould closure forces which engage on the tool clamping plate via rails outside the mould region. The invention further relates to a mould closure of an injection moulding machine with tool clamping plates which are deflected or deformed under the mould closure forces.
PRIOR ART
The invention relates to the type of injection moulding machines with rails. The great advantage of the rail machine lies in that the forces are closed onto the two tool clamping plates via at least four rails arranged in the outermost corners of the four-cornered tool clamping plate in longitudinal direction of the injection moulding machine. In the past, the tool clamping plates were produced as solid cast bodies which weighed tons. The two mould halves were also solid in construction. In the course of the ongoing improvements to material usage, both the tool clamping plates and also the moulding tools themselves were constructed increasingly lighter. Independently thereof, however, the requirements increased relating to the closure forces, whether due to process or due to ever larger moulds in multiple injection moulds. It is interesting that the relatively small moulds, for example for the production of cans or buckets, produce the greatest problems. If the force is introduced via engagement points on the outer corners, the tool clamping plate on the nozzl.e side easily deflects in the case of tools in which the principal forces occur in the centre. This is very harmful for the tools and is disadvantageous for the i_njection moulding process.
The entire development led in a sense to a conflict of aims:
= Independently of the mould size, in every case the best qualities are required of the injection moulded articles.
= Regardless of aiming for a lighter construction of the entire injection moulding machine, the mould manufacturer, precisely under the highest required injection moulding pressures or closing forces for the moulds, expects that the clamping plates do not deflect or that these remain as far as possible absolutely plane-parallel. In particular, the forces from the rails lying on the outside should not stand out on the flat tool clamping surface of the tools or moulds.
= As in several cases of application, not only a quite specific mould size but also the most varied mould dimensions are used in the same machine, it is required that the forces onto the mould halves are transmitted uniformly for the smallest and largest moulds or tools in the central region.
This is in the case of small injection moulding machines of for example 50 t up to large injection moulding machines of 1000 t and more closure force.
On the part of the driven or movable tool clamping plate, the machine manufacturer generally has sufficient design freedom, in order to introduce the driving forces optimally in the region of the tools. On the basis of the above-mentioned requirements, in rail machines with a rail guide on the outer four corners, a problem has been observed with regard to possible deformations of the tool clamping plate on the nozzle side. Specific structural measures must be taken in order to ensure a maximum plane parallelism of the tool clamping surfaces in operation even under the highest loads.
The US patent document 4 615 857 (Motorola) suggests solving the problem of deflection of the support surface in that the deflection of the tool clamping plate on the nozzle side is detected by measurement technology and is compensated over the region of the tool bearing surface by a plurality of locally engaging support bodies.
EP 747 196 (Husky) suggests a design with two plates or walls or respectively a double wall design. The double wall is formed as a mould counter-pressure plate with two walls spaced apart from each other, with an intermediate support structure. The actual mould clamping plate or wall is designated as the first wall and the spaced plate is designated as the second wall.
The rails engage directly on the corners of the second wall, which transfer the holding forces into the centre region of the second plate. The intermediate structure is designed to the corresponding force transmission and has a wide end on the dosing side. The intermediate structure is embodied so as to be bent, conical, V-shaped or C-shaped, so that the forces are transmitted over the bulge-shaped elements to the centre region of the first wall. Because the second wall is constructed as a solid wall, all transverse forces are absorbed in the second wall, so that only longitudinal forces or compressive forces are introduced onto the central zone directly in the region of the mould support. In this way, with regard to the tool support, any deflection is to be avoided. A disadvantage is the relatively complex box structure without appreciable saving on weight, at least compared with DE 40 04 026.
DE 40 04 026 (Toshiba) suggests composing the stationary or fixed tool clamping plate from two plates. The actual tool clamping late is guided loosely, independently of the rails. An end plate is arranged on the rear side of the tool clamping plate.
The rails rest on the outer end plate. The outer end plate is placed with a projecting intermediate ring in a force-fitting manner onto the tool clamping plate on the nozzle side. The advantage of this solution lies in that any deformations on the end plate from the holding forces have no direct influence on the flatness of the tool support surface of the tool clamping plate on the nozzle side. By means of the ring-shaped transmission surface, the holding forces are applied in a defined manner in the central region onto the tool support surface. The disadvantage of this solution lies in that on the dosing side, two relatively heavy plates are required, so that the aim of a weight reduction is not solved. With regard to the problem description, reference is made to DE 40 04 026 with Figures 1, 2 and 3 as prior art. In this device, a stationary moulding tool is fastened to a stationary mould plate 3, which is clamped on the ends of several rails 4 (usually four) by means of nuts S. The other ends of the rails 4 are connected by means of nuts 5 with a device producing a clamping force, which is formed by a large-capacity oil pressure cylinder 6. The movable moulding tool 2 is fastened to a movable mould plate 9, which is moved through the action of the oil pressure cylinder 6 along the rails 4 onto the stationary mould plate 3 to and away from the latter. The clamping force which clamps the stationary moulding tool 1 and the movable moulding tool 2 together is produced by the device producing a clamping force, which contains a large-capacity oil pressure cylinder 6. The clamping force is applied via the movable mould plate 9 onto the stationary moulding tool 1 and the movable moulding tool 2. The reaction force produced by the application of the clamping force is applied via the tool clamping plate 3, 12 on the nozzle side and the rails 4 onto the device producing a clamping force.
In the mould closure according to DE 40 04 026, the tool clamping plate 3, 12 on the nozzle side is connected with the rails 4 at the four corners of the end plate 12 by nuts 5. The points A and B, at which the clamping force is applied onto the moulding tools, have a distance from each other which produces the bending movement shown in Fig. 3. Thereby, the clamping force is not applied uniformly onto a mould cavity 10, which is delimited between the stationary tool 1 and the movable tool 2. By the bending of the stationary mould plate 3, the rails 4 also bend, as is shown in Fig. 3. When, under this condition, hot melt 11 is injected through an injection nozzle, which is not shown, into the mould cavity 10, owing to the pressure P of the melt 11 the dimension of the cavity 10 is altered, so that no mould products with precise dimensions can be obtained.
The mould closure, as is shown in Fig. 1 according to DE 40 04 026, contains a stationary metal mould 1 which is fastened to a stationary tool clamping plate 3 on the nozzle side. On the rear face of the stationary tool clamping plate 3 on the nozzle side, a projection 13 is formed which has substantially the same size as the metal mould 1. The end element, an end plate 12, is fastened on the right-hand ends of the rails 4 by means of nuts 5, so that the plate 12 lies against the end of the projection 13. Openings 14 are formed at the four corners of the plate 3, so that the rails 4 extend loosely through the openings 14. The internal diameter of each opening 14 is somewhat greater than the external diameter of each rail 4. The rails 4 therefore penetrate the openings 14 freely. According to DE 40 04 026, the tool clamping plate on the nozzle side and the rails 4 no longer bend on application of the clamping force. The openings 14 need to be only slightly greater than the diameters of the rails 4. The left-hand ends of the rails 4 are connected by nuts 8 with a flange 6A
of a device 7, producing a clamping force, in the form of a large-capacity oil pressure cylinder 6.
All solutions of the prior art have in common the fact that the initially described problems are solved by relatively complex means. In addition, a heavy construction of the tool clamping plate on the nozzle side is the result.
REPRESENTATION OF THE INVENTION
The invention was now presented with the problem of developing a design for a mould closure which allows a noticeable weight reduction, at least of the tool clamping plate on the nozzle side, in which even under the greatest closure forces, no harmful effects of deflections or deflection forces occur onto the tool clamping surface.
The method according to the invention is characterized in that the tool clamping plate which is on the nozzle side and/or is movable is at least partially deflected or elastically deformed in terms of the mould closure forces on a processing table, and a flat processing is carried out in the region of the tool clamping surface under the deformation force.
The device according to the invention is characterized in that the tool clamping surface of the tool clamping plate, which is on the nozzle side andlor is movable, in the unstressed stated has at least partially a convex shape which is able to be transferred under the mould closure forces into an approximately flat or slightly concave shape.
It has been found by the inventors that the problem of changing the shape of the clamping plate is not only a pure deflection problem but likewise a problem of the mould itself. With regard to the moulds, three cases occur:
= Moulds which have weak points in a central region, for example through large cavities, e.g. for the injection moulding of buckets. The disadvantage lies in that the mould parts sustain damage in the corresponding region.
= Moulds which are constructed so as to be very light and do not tolerate any deflections whatsoever of the tool clamping surface or in which the quality of the injection moulded parts is impaired with the deflection of the mould.
= Moulds having a large area, in which no deflection in the plane parallelism is permissible on the whole tool clamping surface under highest mould closure forces.
The US patent document 4 615 857 (Motorola) suggests solving the problem of deflection of the support surface in that the deflection of the tool clamping plate on the nozzle side is detected by measurement technology and is compensated over the region of the tool bearing surface by a plurality of locally engaging support bodies.
EP 747 196 (Husky) suggests a design with two plates or walls or respectively a double wall design. The double wall is formed as a mould counter-pressure plate with two walls spaced apart from each other, with an intermediate support structure. The actual mould clamping plate or wall is designated as the first wall and the spaced plate is designated as the second wall.
The rails engage directly on the corners of the second wall, which transfer the holding forces into the centre region of the second plate. The intermediate structure is designed to the corresponding force transmission and has a wide end on the dosing side. The intermediate structure is embodied so as to be bent, conical, V-shaped or C-shaped, so that the forces are transmitted over the bulge-shaped elements to the centre region of the first wall. Because the second wall is constructed as a solid wall, all transverse forces are absorbed in the second wall, so that only longitudinal forces or compressive forces are introduced onto the central zone directly in the region of the mould support. In this way, with regard to the tool support, any deflection is to be avoided. A disadvantage is the relatively complex box structure without appreciable saving on weight, at least compared with DE 40 04 026.
DE 40 04 026 (Toshiba) suggests composing the stationary or fixed tool clamping plate from two plates. The actual tool clamping late is guided loosely, independently of the rails. An end plate is arranged on the rear side of the tool clamping plate.
The rails rest on the outer end plate. The outer end plate is placed with a projecting intermediate ring in a force-fitting manner onto the tool clamping plate on the nozzle side. The advantage of this solution lies in that any deformations on the end plate from the holding forces have no direct influence on the flatness of the tool support surface of the tool clamping plate on the nozzle side. By means of the ring-shaped transmission surface, the holding forces are applied in a defined manner in the central region onto the tool support surface. The disadvantage of this solution lies in that on the dosing side, two relatively heavy plates are required, so that the aim of a weight reduction is not solved. With regard to the problem description, reference is made to DE 40 04 026 with Figures 1, 2 and 3 as prior art. In this device, a stationary moulding tool is fastened to a stationary mould plate 3, which is clamped on the ends of several rails 4 (usually four) by means of nuts S. The other ends of the rails 4 are connected by means of nuts 5 with a device producing a clamping force, which is formed by a large-capacity oil pressure cylinder 6. The movable moulding tool 2 is fastened to a movable mould plate 9, which is moved through the action of the oil pressure cylinder 6 along the rails 4 onto the stationary mould plate 3 to and away from the latter. The clamping force which clamps the stationary moulding tool 1 and the movable moulding tool 2 together is produced by the device producing a clamping force, which contains a large-capacity oil pressure cylinder 6. The clamping force is applied via the movable mould plate 9 onto the stationary moulding tool 1 and the movable moulding tool 2. The reaction force produced by the application of the clamping force is applied via the tool clamping plate 3, 12 on the nozzle side and the rails 4 onto the device producing a clamping force.
In the mould closure according to DE 40 04 026, the tool clamping plate 3, 12 on the nozzle side is connected with the rails 4 at the four corners of the end plate 12 by nuts 5. The points A and B, at which the clamping force is applied onto the moulding tools, have a distance from each other which produces the bending movement shown in Fig. 3. Thereby, the clamping force is not applied uniformly onto a mould cavity 10, which is delimited between the stationary tool 1 and the movable tool 2. By the bending of the stationary mould plate 3, the rails 4 also bend, as is shown in Fig. 3. When, under this condition, hot melt 11 is injected through an injection nozzle, which is not shown, into the mould cavity 10, owing to the pressure P of the melt 11 the dimension of the cavity 10 is altered, so that no mould products with precise dimensions can be obtained.
The mould closure, as is shown in Fig. 1 according to DE 40 04 026, contains a stationary metal mould 1 which is fastened to a stationary tool clamping plate 3 on the nozzle side. On the rear face of the stationary tool clamping plate 3 on the nozzle side, a projection 13 is formed which has substantially the same size as the metal mould 1. The end element, an end plate 12, is fastened on the right-hand ends of the rails 4 by means of nuts 5, so that the plate 12 lies against the end of the projection 13. Openings 14 are formed at the four corners of the plate 3, so that the rails 4 extend loosely through the openings 14. The internal diameter of each opening 14 is somewhat greater than the external diameter of each rail 4. The rails 4 therefore penetrate the openings 14 freely. According to DE 40 04 026, the tool clamping plate on the nozzle side and the rails 4 no longer bend on application of the clamping force. The openings 14 need to be only slightly greater than the diameters of the rails 4. The left-hand ends of the rails 4 are connected by nuts 8 with a flange 6A
of a device 7, producing a clamping force, in the form of a large-capacity oil pressure cylinder 6.
All solutions of the prior art have in common the fact that the initially described problems are solved by relatively complex means. In addition, a heavy construction of the tool clamping plate on the nozzle side is the result.
REPRESENTATION OF THE INVENTION
The invention was now presented with the problem of developing a design for a mould closure which allows a noticeable weight reduction, at least of the tool clamping plate on the nozzle side, in which even under the greatest closure forces, no harmful effects of deflections or deflection forces occur onto the tool clamping surface.
The method according to the invention is characterized in that the tool clamping plate which is on the nozzle side and/or is movable is at least partially deflected or elastically deformed in terms of the mould closure forces on a processing table, and a flat processing is carried out in the region of the tool clamping surface under the deformation force.
The device according to the invention is characterized in that the tool clamping surface of the tool clamping plate, which is on the nozzle side andlor is movable, in the unstressed stated has at least partially a convex shape which is able to be transferred under the mould closure forces into an approximately flat or slightly concave shape.
It has been found by the inventors that the problem of changing the shape of the clamping plate is not only a pure deflection problem but likewise a problem of the mould itself. With regard to the moulds, three cases occur:
= Moulds which have weak points in a central region, for example through large cavities, e.g. for the injection moulding of buckets. The disadvantage lies in that the mould parts sustain damage in the corresponding region.
= Moulds which are constructed so as to be very light and do not tolerate any deflections whatsoever of the tool clamping surface or in which the quality of the injection moulded parts is impaired with the deflection of the mould.
= Moulds having a large area, in which no deflection in the plane parallelism is permissible on the whole tool clamping surface under highest mould closure forces.
The new invention allows consideration to be given to these particular cases, and is therefore able to be used flexibly. Generally, the machine manufacturer has knowledge of the specific mould problems and still in the manufacturing plant can carry out a preventive processing of the tool clamping surface in line with specific objectives.
The invention permits a number of particularly advantageous developments, for which reference is made to Claims 2 to 7 and 9 to 12.
The deflection force for the flat processing is at least 50% of the maximum mould closure forces which are to be expected. This means that with a 50-ton machine at least 25 tons and with a 100 ton machine at least 500 tons deflection force is applied during flat processing. As a consequence, the result is that the deflection force is selected so that the tool clamping surface of the tool clamping plate assumes a flat shape with at least 50% of the mould closure force. Quite particularly preferably, the deflection force for the flat processing is 60% to approximately 100% of the mould closure forces. Here, the deflection which is to be expected in the operating state is compensated with respectively a maximum mould closure force at 60% to 1000. In practice, this tool clamping plate is placed onto the processing table for processing in the region of the rail engagement sites, a pressure force for the deflection force is applied in the central region of the tool clamping plate and thereby a three-dimensional deflection form is produced which is as similar as possible to the deflection in the mould closure state.
The aim is to apply the acting forces already in the flat processing of the tool clamping plate on the nozzle side in as similar a manner as possible to how they occur in the actual case of the mould closure forces. This presupposes clamping arrangements by which operations are carried out in an analogous manner to the situation of the mould closure. The aim is that in the mould closure phase, the tool clamping surface assumes a flat state at the latest after the start of the injection process under the mould closure forces.
When the deformation force engages, on flat processing, approximately in the centre of the tool clamping plate, an increasing thickness is removed from the central region up to the outer edge of the tool clamping surface. The removal amounts to a few tenths of a millimetre towards the outside, at all events approximately 0.5 millimetres.
According to a further development idea, the removed material is transferred at least approximately from the convex shape occurring under the actual closure forces by corresponding processing into a flat surface. In order to achieve this, the forces of the actual case of mould closure are taken into consideration in the processing with an approximately average mould dimension.
According to a further particularly advantageous development, the tool clamping plate on the nozzle side is supported for processing in the region of the tool support or only in an inner weak region of the tool, and a pressing force is applied for the deflection force in the central region of the tool support surface.
BRIEF DESCRIPTION OF THE INVENTION
The invention is now illustrated my means of some example embodiments with further details, in which:
The invention permits a number of particularly advantageous developments, for which reference is made to Claims 2 to 7 and 9 to 12.
The deflection force for the flat processing is at least 50% of the maximum mould closure forces which are to be expected. This means that with a 50-ton machine at least 25 tons and with a 100 ton machine at least 500 tons deflection force is applied during flat processing. As a consequence, the result is that the deflection force is selected so that the tool clamping surface of the tool clamping plate assumes a flat shape with at least 50% of the mould closure force. Quite particularly preferably, the deflection force for the flat processing is 60% to approximately 100% of the mould closure forces. Here, the deflection which is to be expected in the operating state is compensated with respectively a maximum mould closure force at 60% to 1000. In practice, this tool clamping plate is placed onto the processing table for processing in the region of the rail engagement sites, a pressure force for the deflection force is applied in the central region of the tool clamping plate and thereby a three-dimensional deflection form is produced which is as similar as possible to the deflection in the mould closure state.
The aim is to apply the acting forces already in the flat processing of the tool clamping plate on the nozzle side in as similar a manner as possible to how they occur in the actual case of the mould closure forces. This presupposes clamping arrangements by which operations are carried out in an analogous manner to the situation of the mould closure. The aim is that in the mould closure phase, the tool clamping surface assumes a flat state at the latest after the start of the injection process under the mould closure forces.
When the deformation force engages, on flat processing, approximately in the centre of the tool clamping plate, an increasing thickness is removed from the central region up to the outer edge of the tool clamping surface. The removal amounts to a few tenths of a millimetre towards the outside, at all events approximately 0.5 millimetres.
According to a further development idea, the removed material is transferred at least approximately from the convex shape occurring under the actual closure forces by corresponding processing into a flat surface. In order to achieve this, the forces of the actual case of mould closure are taken into consideration in the processing with an approximately average mould dimension.
According to a further particularly advantageous development, the tool clamping plate on the nozzle side is supported for processing in the region of the tool support or only in an inner weak region of the tool, and a pressing force is applied for the deflection force in the central region of the tool support surface.
BRIEF DESCRIPTION OF THE INVENTION
The invention is now illustrated my means of some example embodiments with further details, in which:
Figure 1 shows the prior art on the basis of DE 40 04 026 with a double wall of the tool clamping plate on the nozzle side;
Figure 2 shows a still older prior art with a simple tool clamping plate on the nozzle side;
Figure 3 shows the solution according to Figure 2 with exaggeratedly illustrated deflection of the tool clamping plate on the mould side, and of the rails;
Figure 4 shows the mould closure side of an injection moulding machine;
Figures 5a, 5b, 5c show the case examples with load regions of differing size for the tool clamping plate on the nozzle side;
Figures 5d and 5e show diagrammatically the movable tool clamping plate;
Figure 6 shows the tool clamping plate on the nozzle side at the start and at the end of the flat processing;
Figures 7a, 7b and 7c show three situations, without load (Figure 7a), with full load (Figure 7b) and with full load, but with approximately 50 - 60% compensation in the flat processing (Figure 7c).
WAYS AND EMBODIMENT OF THE INVENTION
Figure 4 shows the entire mould closure side or respectively the mould closure of an injection moulding machine, without the injection unit. On the left-hand side, a drive support plate 20 is illustrated, in the central region a movable tool clamping plate 9 and on the right the fixed tool clamping plate 3 on the nozzle side. A toggle lever mechanism 21 and a toggle lever drive 22 are arranged between the drive support plate 20 and the movable tool clamping plate 9. The drive support plate 20 is only placed onto the lower part 23.
The movable tool clamping plate 9 is supported by means of guide tracks 24 via guide bearings 25 which are constructed so as to be free of play. The movable tool clamping plate 9 can only be moved horizontally. In the operating state, the tool clamping plate 3 on the nozzle side is securely fixed on the lower part 23 by screws 26. The longitudinal axis of the machine is designated by 15. The tool clamping plate 3 on the nozzle side is stationary with a moulding tool 1.
An injection cylinder 16 is brought up to the injection opening of the moulding tool 1. A normal operating situation is illustrated diagrammatically, during the injection process with full action of the mould closure forces "Z", which are closed over the rails 4 and the tool clamping plate 3. The tool clamping surface 17 is illustrated totally flat. This means that the theoretical deflection of the tool clamping plate on the nozzle side within the processing was compensated 100% at the machine manufacturer's works.
Figure 5a shows an example case in which not only the entire support surface 17, i.e. the entire region of the moulding tool, but also the remaining surface of the tool clamping plate on the support side is processed, which is emphasized diagrammatically by a dot-and-dash circle 38 or respectively with spacer sleeves 35 for the processing.
In Figure 5b the processing is carried out so that only a corresponding surface according to the dot-and-dash circle is taken into account.
Figure 2 shows a still older prior art with a simple tool clamping plate on the nozzle side;
Figure 3 shows the solution according to Figure 2 with exaggeratedly illustrated deflection of the tool clamping plate on the mould side, and of the rails;
Figure 4 shows the mould closure side of an injection moulding machine;
Figures 5a, 5b, 5c show the case examples with load regions of differing size for the tool clamping plate on the nozzle side;
Figures 5d and 5e show diagrammatically the movable tool clamping plate;
Figure 6 shows the tool clamping plate on the nozzle side at the start and at the end of the flat processing;
Figures 7a, 7b and 7c show three situations, without load (Figure 7a), with full load (Figure 7b) and with full load, but with approximately 50 - 60% compensation in the flat processing (Figure 7c).
WAYS AND EMBODIMENT OF THE INVENTION
Figure 4 shows the entire mould closure side or respectively the mould closure of an injection moulding machine, without the injection unit. On the left-hand side, a drive support plate 20 is illustrated, in the central region a movable tool clamping plate 9 and on the right the fixed tool clamping plate 3 on the nozzle side. A toggle lever mechanism 21 and a toggle lever drive 22 are arranged between the drive support plate 20 and the movable tool clamping plate 9. The drive support plate 20 is only placed onto the lower part 23.
The movable tool clamping plate 9 is supported by means of guide tracks 24 via guide bearings 25 which are constructed so as to be free of play. The movable tool clamping plate 9 can only be moved horizontally. In the operating state, the tool clamping plate 3 on the nozzle side is securely fixed on the lower part 23 by screws 26. The longitudinal axis of the machine is designated by 15. The tool clamping plate 3 on the nozzle side is stationary with a moulding tool 1.
An injection cylinder 16 is brought up to the injection opening of the moulding tool 1. A normal operating situation is illustrated diagrammatically, during the injection process with full action of the mould closure forces "Z", which are closed over the rails 4 and the tool clamping plate 3. The tool clamping surface 17 is illustrated totally flat. This means that the theoretical deflection of the tool clamping plate on the nozzle side within the processing was compensated 100% at the machine manufacturer's works.
Figure 5a shows an example case in which not only the entire support surface 17, i.e. the entire region of the moulding tool, but also the remaining surface of the tool clamping plate on the support side is processed, which is emphasized diagrammatically by a dot-and-dash circle 38 or respectively with spacer sleeves 35 for the processing.
In Figure 5b the processing is carried out so that only a corresponding surface according to the dot-and-dash circle is taken into account.
The solution according to Figure 5c is to be provided in accordance with circle 39 or respectively in accordance with the spacer sleeves 36 in cases in which the tool has an inner weak region, for example in the case of a large central cavity.
Figure 5d shows a view of the movable tool clamping plate 9 with the engagement sites for the toggle levers 21.
Figure 5e shows a side view of Figure 5d with an exaggeratedly illustrated barrel-shaped deflection of the tool clamping plate (radius R).
Figure 6 shows diagrammatically the flat processing of the tool clamping surface 17. The tool clamping plate 3 is fastened rigidly via guide rods 30 and spacer sleeves 31 to a stand plate 32 of a flat processing machine. The support surface is drawn to the right by a tension screw 33 with tightening nut 34 of a force k of 50 - 100% of the mould closure forces, so that the support surface deflects to a concave shape 17a.
Subsequently, the support surface is transferred through a flat processing under the tensile force "K"
into a flat surface 17b. Here, an increasing thickness "X" is removed from the inside outwards, which in practice can amount for example to 0.1 to 0.5 mm.
After the flat processing and the loosening of the tightening nut 34, the flat surface lb continues into a convex surface 17c (Figure 7a). Accordingly, the injection moulding machine is delivered to the injection moulder with a convex support surface 17c of the tool clamping plate. The customer mounts the tool 1 on the nozzle side in accordance with Figure 7a onto the clamping plate 3. Figure 7b shows a situation with the action of the full closure forces and with a 100%
Figure 5d shows a view of the movable tool clamping plate 9 with the engagement sites for the toggle levers 21.
Figure 5e shows a side view of Figure 5d with an exaggeratedly illustrated barrel-shaped deflection of the tool clamping plate (radius R).
Figure 6 shows diagrammatically the flat processing of the tool clamping surface 17. The tool clamping plate 3 is fastened rigidly via guide rods 30 and spacer sleeves 31 to a stand plate 32 of a flat processing machine. The support surface is drawn to the right by a tension screw 33 with tightening nut 34 of a force k of 50 - 100% of the mould closure forces, so that the support surface deflects to a concave shape 17a.
Subsequently, the support surface is transferred through a flat processing under the tensile force "K"
into a flat surface 17b. Here, an increasing thickness "X" is removed from the inside outwards, which in practice can amount for example to 0.1 to 0.5 mm.
After the flat processing and the loosening of the tightening nut 34, the flat surface lb continues into a convex surface 17c (Figure 7a). Accordingly, the injection moulding machine is delivered to the injection moulder with a convex support surface 17c of the tool clamping plate. The customer mounts the tool 1 on the nozzle side in accordance with Figure 7a onto the clamping plate 3. Figure 7b shows a situation with the action of the full closure forces and with a 100%
compensation of the deflection which is theoretically to be expected. The support surface 17d is totally flat. Thereby, a uniform bearing force is produced onto the tool, with the advantages described in the introduction.
In the case of more robust tools, the tensile stress for the flat processing can be set for example to only 60 - 80% of the mould closure force which is theoretically to be expected. The result is that in the operating state with full mould closure force, in accordance with Figure 7c, the support surface assumes a slightly arched or concave shape 17e.
In the case of more robust tools, the tensile stress for the flat processing can be set for example to only 60 - 80% of the mould closure force which is theoretically to be expected. The result is that in the operating state with full mould closure force, in accordance with Figure 7c, the support surface assumes a slightly arched or concave shape 17e.
Claims (12)
1. Method for achieving as high a plane parallelism as possible of the tool clamping surface (17) of the movable tool clamping plate (3) on the nozzle side of injection moulding machines, in the operating state under the mould closure forces, which engage on the tool clamping plate via rails (4) outside the mould region, wherein a spherical curvature was previously given to the tool clamping surface, characterized in that the tool clamping plate (3) is at least partially deflected or elastically deformed in terms of the mould closure forces ("Z") on a processing table, and a flat processing is carried out in the region of the tool clamping surface (17) under the deformation force, wherein the tool clamping plate (3) is placed onto the processing table for processing in the region of the rail engagement sites, a pressure force for the deflection force is applied in the central region of the tool clamping plate (3) and thereby a three-dimensional deflection form is produced which is as similar as possible to the deflection in the mould closure state.
2. Method according to Claim 1, characterized in that the deflection force for the flat processing is at least 50% of the maximum mould closure forces which are to be expected.
3. Method according to one of Claims 1 or 2, characterized in that the deflection force is selected so that the tool clamping surface (17) of the tool clamping plate (3) assumes a flat shape at at least 50% of the mould closure force.
4. Method according to Claim 1 or 2, characterized in that the deflection force for the flat processing is 60% to approximately 100% of the mould closure forces.
5. Method according to one of Claims 1 to 4, characterized in that the tool clamping plate (3) on the nozzle side is placed onto the processing table for processing in the region of the rail engagement sites and a pressure force for the deflection force is applied in the central region of the tool clamping plate (3) and thereby a three-dimensional deflection form is produced which is as similar as possible to the deflection in the mould closure state.
6. Method according to one of Claims 1 to 4, characterized in that the tool clamping plate (3) on the nozzle side for processing is supported in the region of the tool support or only in an inner weak region of the tool and a pressure force is applied for the deflection force in the central region of the tool support surface.
7. Method according to one of Claims 1 to 6, characterized in that in the mould closure phase, the tool clamping surface (17) assumes a flat state at the latest after the start of the injection process under the mould closure forces.
8. Mould closure of an injection moulding machine with a tool clamping plate (3), which is deflected or deformed under the mould closure forces, wherein to achieve as high a plane parallelism as possible of the tool clamping surface (17) of the movable tool clamping plate (3) on the nozzle side, in the operating state under the mould closure forces which engage on the tool clamping plate via rails (4) outside the mould region, wherein a spherical curvature was previously given to the tool clamping surface, characterized in that the tool clamping plate (3) is at least partially deflected or elastically deformed in terms of the mould closure forces ("Z") on a processing table and a flat processing is carried out in the region of the tool clamping surface (17) under the deformation force, wherein the tool clamping plate (3) is placed onto the processing table for processing in the region of the rail engagement sites, a pressure force for the deflection force is applied in the central region of the tool clamping plate (3) and thereby a three-dimensional deflection form is able to be produced which is as similar as possible to the deflection in the mould closure state.
9. Mould closure according to Claim 8, characterized in that the tool clamping surface (17) on the nozzle side, within the production of the injection moulding machine is deflected under a corresponding deformation force and flat-processed, wherein an increasing thickness is removed from the central region up to the outer edge.
10. Mould closure according to Claim 8 or 9, characterized in that the removed material from the central region of the tool clamping surface (17) is from zero to a few tenths of a millimetre.
11. Mould closure according to one of Claims 8 to 10, characterized in that the removed material is transferred by corresponding processing into an approximately flat surface at least approximately from the convex shape occurring under the actual mould closure forces ("Z").
12. Mould closure according to one of Claims 8 to 10, characterized in that the removed material is established such that the entire tool support surface or only a weak region of the moulding tool (1) is taken into account.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CH01291/07 | 2007-08-16 | ||
| CH12912007 | 2007-08-16 | ||
| PCT/EP2008/060525 WO2009021935A1 (en) | 2007-08-16 | 2008-08-11 | Process and mould closure for an injection moulding machine having a tool clamping plate |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2695585A1 true CA2695585A1 (en) | 2009-02-19 |
Family
ID=39863287
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA2695585A Abandoned CA2695585A1 (en) | 2007-08-16 | 2008-08-11 | Method and mould closure for an injection moulding machine with a tool clamping plate |
Country Status (3)
| Country | Link |
|---|---|
| CA (1) | CA2695585A1 (en) |
| DE (2) | DE202008010066U1 (en) |
| WO (1) | WO2009021935A1 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103612365B (en) * | 2013-11-29 | 2016-02-24 | 常州市川意来自动化机械制造有限公司 | A kind of injection molding mechanical arm equipment |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB854521A (en) * | 1956-04-16 | 1960-11-23 | Associated Electrical Idustrie | Improved method of producing a substantially spherical or substantially cylindrical surface of large radius |
| US4615857A (en) | 1984-11-30 | 1986-10-07 | Motorola, Inc. | Encapsulation means and method for reducing flash |
| JPH0641160B2 (en) | 1989-02-15 | 1994-06-01 | 東芝機械株式会社 | Mold clamping device |
| DE4427949C1 (en) * | 1994-08-06 | 1995-09-21 | Kloeckner Desma Elastomertechn | Compensation for mould bulging in injection moulding machines |
| US5593711A (en) | 1995-06-07 | 1997-01-14 | Husky Injection Molding Systems Ltd. | Uniformly compressible platen |
| AT1654U1 (en) * | 1995-12-11 | 1997-09-25 | Engel Gmbh Maschbau | DEVICE FOR CLOSING AND OPENING A DIVIDED MOLD FOR INJECTION MOLDING |
| JP2002192567A (en) * | 2000-12-27 | 2002-07-10 | Meiki Co Ltd | Mold clamping device |
-
2008
- 2008-07-26 DE DE200820010066 patent/DE202008010066U1/en not_active Expired - Lifetime
- 2008-08-11 DE DE112008001569T patent/DE112008001569A5/en not_active Withdrawn
- 2008-08-11 WO PCT/EP2008/060525 patent/WO2009021935A1/en active Application Filing
- 2008-08-11 CA CA2695585A patent/CA2695585A1/en not_active Abandoned
Also Published As
| Publication number | Publication date |
|---|---|
| WO2009021935A1 (en) | 2009-02-19 |
| DE202008010066U1 (en) | 2008-10-16 |
| DE112008001569A5 (en) | 2010-06-10 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FZDE | Discontinued |
Effective date: 20130813 |