US20050064059A1 - Plasticizing barrel lined on the inside with a coating, and method of making such a plasticizing barrel - Google Patents
Plasticizing barrel lined on the inside with a coating, and method of making such a plasticizing barrel Download PDFInfo
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- US20050064059A1 US20050064059A1 US10/980,635 US98063504A US2005064059A1 US 20050064059 A1 US20050064059 A1 US 20050064059A1 US 98063504 A US98063504 A US 98063504A US 2005064059 A1 US2005064059 A1 US 2005064059A1
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- United States
- Prior art keywords
- coating
- negative mold
- projections
- plasticizing barrel
- hollow
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D19/00—Casting in, on, or around objects which form part of the product
- B22D19/08—Casting in, on, or around objects which form part of the product for building-up linings or coverings, e.g. of anti-frictional metal
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D19/00—Casting in, on, or around objects which form part of the product
- B22D19/06—Casting in, on, or around objects which form part of the product for manufacturing or repairing tools
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- 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
- B29C45/46—Means for plasticising or homogenising the moulding material or forcing it into the mould
- B29C45/58—Details
- B29C45/62—Barrels or cylinders
-
- 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
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/36—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die
- B29C48/50—Details of extruders
- B29C48/68—Barrels or cylinders
-
- 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
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/36—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die
- B29C48/50—Details of extruders
- B29C48/68—Barrels or cylinders
- B29C48/6801—Barrels or cylinders characterised by the material or their manufacturing process
-
- 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
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2995/00—Properties of moulding materials, reinforcements, fillers, preformed parts or moulds
- B29K2995/0037—Other properties
- B29K2995/007—Hardness
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2009/00—Layered products
- B29L2009/005—Layered products coated
Definitions
- the present invention relates, in general, to a plasticizing barrel, and to a method of making such a plasticizing barrel.
- Plasticizing barrels are used to plasticize granular plastic material in an injection assembly or an extruder by means of a screw for a subsequent injection process.
- a wear-resisting coating As the inner wall of the plasticizing barrel is subject to great stress during plasticizing, it has been commonly proposed to line the inner wall with a wear-resisting coating.
- the application of such a wear-resisting coating may be implemented by a so-called centrifugal casting process in which metallic powder is introduced into a rotating hot hollow-cylindrical body, pressed against the inner barrel wall as a consequence of centrifugal forces, and melted there. After a cool-down period, the thus produced layer on the inside wall exhibits a fairly good surface quality and requires only little finishing works.
- barrels with grooves are required whereby the grooves extend almost over the entire length of the plasticizing barrel.
- These barrels do not have a wear-resisting protective layer; rather, barrel blanks are formed in “soft state” with the grooves, and subsequently the inner barrel wall is hardened by a nitriding process.
- grooved bushings are placed in the feed zone of plasticizing units for improving the transport of introduced raw plastic material.
- These grooved bushings are normally also coated for wear-resistance, e.g., through a high-temperature isostatic pressing process.
- the wear-resisting protective layer of the grooved bushing can be provided either directly into the plasticizing barrel, or the grooved bushing can be produced separately and subsequently placed into the plasticizing barrel. This process is applicable only for relatively short grooves.
- a plasticizing barrel for a plastics processing machine includes a hollow cylindrical body, and a coating which lines an inner wall surface of the body and is formed with at least one groove extending in axial direction of the body.
- the present invention resolves prior art problems by forming the groove or grooves completely in the inner coating itself rather than in the hollow cylindrical body.
- the provision of the groove in the inside coating can be realized by a centrifugal casting process, whereby an axially extending negative mold, formed with axial projections, is placed in the hollow-cylindrical body, and, after carrying out the centrifugal casting process, is removed again.
- the centrifugal casting process may also be carried out in two stages by initially applying a smooth layer on the inner wall of the hollow cylindrical body through centrifugal casting in the absence of a negative mold, and subsequently carrying out the centrifugal casting process with the negative mold.
- the negative mold may be held in axial centered disposition in the hollow-cylindrical body. However, this centering step may be omitted altogether, when the initial smooth layer is applied at very exact dimensions so that the negative mold is already in centered disposition, when placed into the hollow-cylindrical body.
- a smoothest possible surface of the areas between the grooves may be realized when the layer has a thickness which is smaller than the height of the projections in radial direction.
- the smooth inner layer may be honed in the regions in which the projections are situated so as to realize smooth groove bases in a simple manner.
- the entire inner coating may be honed as well.
- a negative mold for use in a method of making a plasticizing barrel for a plastics processing machine may include a base body formed with axial projections and defined by a diameter which is smaller than an end inner diameter of the coated plasticizing barrel.
- the base body may be cylindrical, and the projections may be part of a cage.
- the projections may be coated with an adhesion-reducing layer and/or wear-reducing layer to facilitate a removal of the negative form.
- an adhesion-reducing layer and/or wear-reducing layer to facilitate a removal of the negative form.
- the projections may have a helical configuration.
- the negative mold can then be withdrawn from the hollow-cylindrical body through a twisting motion.
- FIG. 1 is a schematic, cross sectional view of a plasticizing barrel according to the present invention
- FIG. 2 is a schematic, cross sectional view of a negative mold according to the present invention.
- FIG. 3 is a schematic, cross sectional view of the hollow-cylindrical body with inserted negative mold for making the plasticizing barrel of FIG. 1 ;
- FIG. 4 is a schematic, cross sectional view of the hollow-cylindrical body with inserted negative mold and introduction of material into the hollow-cylindrical body at a process stage before centrifugal casting;
- FIG. 5 is a schematic, cross sectional view of the hollow-cylindrical body with inserted negative mold after centrifugal casting
- FIG. 6 is a schematic, cross sectional view of a hollow-cylindrical body with negative mold in an intermediate step of a variation of a method according to the present invention
- FIG. 7 a is a plan view of a cage for making a plasticizing barrel according to the present invention.
- FIG. 7 b is a fragmentary, perspective view of the cage of FIG. 7 a;
- FIG. 8 is a cutaway, sectional view of the negative mold with projections lined with another layer
- FIGS. 9 a, 9 b show schematic views of modified configurations of projections of the negative mold.
- FIG. 10 shows a schematic view of another variation of a negative mold.
- FIG. 1 there is shown a schematic, cross sectional view of a plasticizing barrel according to the present invention, generally designated by reference numeral 1 and including a hollow-cylindrical body 10 having an inner wall lined with a coating 12 , e.g. a wear-resisting protective layer, which is formed with grooves 14 .
- a coating 12 e.g. a wear-resisting protective layer
- Manufacture of the plasticizing barrel 1 involves the use of a negative mold, as shown in FIG. 2 and generally designated by reference numeral 20 .
- the negative mold 20 has a cylindrical base body 16 which is formed with radial projections 18 about its perimeter.
- the projections 18 extend in axial direction along the surface of the base body 16 and may jut out in straight configuration, i.e. in axis-parallel relationship to the base body 16 , or may have a helical configuration, i.e. extending around the surface of the base body 16 , as shown in FIG. 10 .
- the base body 16 has a diameter which is smaller than an inner diameter D i of the finished plasticizing barrel 1 .
- the outer diameter of the negative mold 20 i.e. the diameter of the inner circle which connects the projection and outer surface is D i +2*h N , wherein h N is the height of the groove to be provided.
- B N represents the width of the projections 18 , i.e. width of the grooves to be provided.
- the negative mold 20 shown in FIG. 2 , is placed into the hollow-cylindrical body 10 which has an inner diameter which is greater than the inner diameter D i of the finished plasticizing barrel 1 by twice the thickness of the finished coating 12 , as shown in FIG. 3 .
- metal powder 22 or other liquid melt is introduced into the intermediate spaces between the projections 18 , as shown in FIG. 4 .
- the hollow-cylindrical body 10 with negative mold 20 and metal powder 22 is then subjected to a centrifugal casting process, i.e. the hollow-cylindrical body 10 with negative mold 20 and metal powder 22 are heated and caused to carry out an axial rotation.
- the metal powder 22 melts and lines the inner wall surface of the hollow-cylindrical body 10 and migrates also into gaps 19 between the projections 18 and the inner wall surface, as shown in FIG. 5 to form the coating 12 .
- the negative mold 20 is removed from the hollow-cylindrical body 10 by being pulled out, when straight projections 18 are involved, or by twisting, when the projections 18 have a helical configuration.
- grooves 14 are formed in the area where the projections 18 have previously been situated, as shown in FIG. 1 . If need be, the inner contour of the plasticizing barrel 1 may be finished by honing (precision grinding).
- the metal powder 22 or liquid melt may also be introduced during the centrifuging process.
- FIG. 6 An alternative to the afore-described manufacturing process of the plasticizing barrel 1 involves the application of a two-step process to make the coating 12 .
- a coating 11 e.g. a wear-resisting protective layer, of constant thickness, preferably, through centrifugal casting, with the coating 11 having an inner diameter of D i +2h N .
- the negative mold 20 or a cage carrying the projections 18 is inserted in the interior of the hollow-cylindrical body 10 .
- An example of a suitable cage is shown in FIGS.
- the initial coating 11 is thick enough to allow the projections 18 to automatically bear against the coating 11 so that the need for a separate centering of the negative mold 20 or the cage is eliminated.
- the negative mold 20 or cage may be used repeatedly. After a number of uses, finishing works, such as polishing, coating, may be suitable.
- the diameter of the base body 16 of the negative mold 20 is smaller than the inner diameter D i of the finished plasticizing barrel 1 , i.e. the groove height h N is smaller than the height of the projections 18 , the surface of the coating 12 between the grooves 14 is ensured to have a very even and smooth configuration as a consequence of the centrifugal forces.
- various alloys may be used as protective layer. These alloys are known to the person skilled in the art so that a detailed description thereof is omitted for the sake of simplicity.
- the projections 18 of the negative mold or cage may be coated with an adhesion-reducing layer and/or wear-reducing layer, as indicated by reference numeral 23 .
- the projections 18 in the direction in which the negative mold 20 is removed from the coated hollow-cylindrical body 16 , indicated by arrow 24 , so as to have increasing width in circumferential direction, as shown in FIG. 9 a, and/or increasing height in radial direction, as shown in FIG. 9 b.
- centrifugal casting is a currently preferred process to make a plasticizing barrel 1 according to the present invention
- other forming process may also be applicable, without departing from the spirit of the present invention.
- Other forming processes may involve, however, also different dimensioning of the negative mold.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
- Extrusion Moulding Of Plastics Or The Like (AREA)
- Moulding By Coating Moulds (AREA)
Abstract
A plasticizing barrel for a plastics processing machine includes a body having a hollow cylindrical configuration and defining an axis; and a coating formed on an inner wall surface of the body and including at least one groove extending in axial direction of the body. The coating, e.g., a wear-resisting protective layer, may be produced through centrifugal casting, whereby the grooves are formed by projections of a negative mold inserted in the hollow-cylindrical body.
Description
- This application is a division of prior filed copending U.S. application Ser. No. 10/361,781, filed Feb. 10, 2003, which claims the priority of German Patent Application, Serial No. 102 06 169.6-16, filed Feb. 14, 2002, pursuant to 35 U.S.C. 119(a)-(d).
- The present invention relates, in general, to a plasticizing barrel, and to a method of making such a plasticizing barrel.
- Plasticizing barrels are used to plasticize granular plastic material in an injection assembly or an extruder by means of a screw for a subsequent injection process. As the inner wall of the plasticizing barrel is subject to great stress during plasticizing, it has been commonly proposed to line the inner wall with a wear-resisting coating. The application of such a wear-resisting coating may be implemented by a so-called centrifugal casting process in which metallic powder is introduced into a rotating hot hollow-cylindrical body, pressed against the inner barrel wall as a consequence of centrifugal forces, and melted there. After a cool-down period, the thus produced layer on the inside wall exhibits a fairly good surface quality and requires only little finishing works.
- When more powerful plasticizing units are involved, barrels with grooves are required whereby the grooves extend almost over the entire length of the plasticizing barrel. These barrels do not have a wear-resisting protective layer; rather, barrel blanks are formed in “soft state” with the grooves, and subsequently the inner barrel wall is hardened by a nitriding process.
- It is also known to place so-called grooved bushings in the feed zone of plasticizing units for improving the transport of introduced raw plastic material. These grooved bushings are normally also coated for wear-resistance, e.g., through a high-temperature isostatic pressing process. The wear-resisting protective layer of the grooved bushing can be provided either directly into the plasticizing barrel, or the grooved bushing can be produced separately and subsequently placed into the plasticizing barrel. This process is applicable only for relatively short grooves.
- It would therefore be desirable and advantageous to provide for a plastics processing machine an improved plasticizing barrel which obviates prior art shortcomings and which includes an inner coating and exhibits on its inner wall a groove or grooves.
- It would also be desirable and advantageous to provide an improved method of making such a plasticizing barrel.
- According to one aspect of the present invention, a plasticizing barrel for a plastics processing machine includes a hollow cylindrical body, and a coating which lines an inner wall surface of the body and is formed with at least one groove extending in axial direction of the body.
- The present invention resolves prior art problems by forming the groove or grooves completely in the inner coating itself rather than in the hollow cylindrical body. Suitably, the provision of the groove in the inside coating can be realized by a centrifugal casting process, whereby an axially extending negative mold, formed with axial projections, is placed in the hollow-cylindrical body, and, after carrying out the centrifugal casting process, is removed again. According to an alternative process, the centrifugal casting process may also be carried out in two stages by initially applying a smooth layer on the inner wall of the hollow cylindrical body through centrifugal casting in the absence of a negative mold, and subsequently carrying out the centrifugal casting process with the negative mold. The negative mold may be held in axial centered disposition in the hollow-cylindrical body. However, this centering step may be omitted altogether, when the initial smooth layer is applied at very exact dimensions so that the negative mold is already in centered disposition, when placed into the hollow-cylindrical body.
- A smoothest possible surface of the areas between the grooves may be realized when the layer has a thickness which is smaller than the height of the projections in radial direction. In the two-stage process described above, the smooth inner layer may be honed in the regions in which the projections are situated so as to realize smooth groove bases in a simple manner. Of course, the entire inner coating may be honed as well.
- According to another aspect of the present invention, a negative mold for use in a method of making a plasticizing barrel for a plastics processing machine, may include a base body formed with axial projections and defined by a diameter which is smaller than an end inner diameter of the coated plasticizing barrel. The base body may be cylindrical, and the projections may be part of a cage.
- According to another feature of the present invention, the projections may be coated with an adhesion-reducing layer and/or wear-reducing layer to facilitate a removal of the negative form. As an alternative, it is, of course, also conceivable to so configure the projections in the direction in which the negative mold is removed from the coated hollow-cylindrical body as to have increasing width in circumferential direction and/or increasing height in radial direction.
- According to another feature of the present invention, the projections may have a helical configuration. As a consequence, the negative mold can then be withdrawn from the hollow-cylindrical body through a twisting motion.
- Other features and advantages of the present invention will be more readily apparent upon reading the following description of currently preferred exemplified embodiments of the invention with reference to the accompanying drawing, in which:
-
FIG. 1 is a schematic, cross sectional view of a plasticizing barrel according to the present invention; -
FIG. 2 is a schematic, cross sectional view of a negative mold according to the present invention; -
FIG. 3 is a schematic, cross sectional view of the hollow-cylindrical body with inserted negative mold for making the plasticizing barrel ofFIG. 1 ; -
FIG. 4 is a schematic, cross sectional view of the hollow-cylindrical body with inserted negative mold and introduction of material into the hollow-cylindrical body at a process stage before centrifugal casting; -
FIG. 5 is a schematic, cross sectional view of the hollow-cylindrical body with inserted negative mold after centrifugal casting; -
FIG. 6 is a schematic, cross sectional view of a hollow-cylindrical body with negative mold in an intermediate step of a variation of a method according to the present invention -
FIG. 7 a is a plan view of a cage for making a plasticizing barrel according to the present invention; -
FIG. 7 b is a fragmentary, perspective view of the cage ofFIG. 7 a; -
FIG. 8 is a cutaway, sectional view of the negative mold with projections lined with another layer; -
FIGS. 9 a, 9 b show schematic views of modified configurations of projections of the negative mold; and -
FIG. 10 shows a schematic view of another variation of a negative mold. - Throughout all the Figures, same or corresponding elements are generally indicated by same reference numerals. These depicted embodiments are to be understood as illustrative of the invention and not as limiting in any way.
- Turning now to the drawing, and in particular to
FIG. 1 , there is shown a schematic, cross sectional view of a plasticizing barrel according to the present invention, generally designated byreference numeral 1 and including a hollow-cylindrical body 10 having an inner wall lined with acoating 12, e.g. a wear-resisting protective layer, which is formed withgrooves 14. - Manufacture of the plasticizing
barrel 1 according to the present invention involves the use of a negative mold, as shown inFIG. 2 and generally designated byreference numeral 20. Thenegative mold 20 has acylindrical base body 16 which is formed withradial projections 18 about its perimeter. Theprojections 18 extend in axial direction along the surface of thebase body 16 and may jut out in straight configuration, i.e. in axis-parallel relationship to thebase body 16, or may have a helical configuration, i.e. extending around the surface of thebase body 16, as shown inFIG. 10 . As indicated inFIG. 2 , thebase body 16 has a diameter which is smaller than an inner diameter Di of the finished plasticizingbarrel 1. The outer diameter of thenegative mold 20, i.e. the diameter of the inner circle which connects the projection and outer surface is Di+2*hN, wherein hN is the height of the groove to be provided. BN represents the width of theprojections 18, i.e. width of the grooves to be provided. - The
negative mold 20, shown inFIG. 2 , is placed into the hollow-cylindrical body 10 which has an inner diameter which is greater than the inner diameter Di of the finished plasticizingbarrel 1 by twice the thickness of the finishedcoating 12, as shown inFIG. 3 . Subsequently,metal powder 22 or other liquid melt is introduced into the intermediate spaces between theprojections 18, as shown inFIG. 4 . The hollow-cylindrical body 10 withnegative mold 20 andmetal powder 22 is then subjected to a centrifugal casting process, i.e. the hollow-cylindrical body 10 withnegative mold 20 andmetal powder 22 are heated and caused to carry out an axial rotation. As a result, themetal powder 22 melts and lines the inner wall surface of the hollow-cylindrical body 10 and migrates also intogaps 19 between theprojections 18 and the inner wall surface, as shown inFIG. 5 to form thecoating 12. Subsequently, thenegative mold 20 is removed from the hollow-cylindrical body 10 by being pulled out, whenstraight projections 18 are involved, or by twisting, when theprojections 18 have a helical configuration. As a result of the removal of thenegative mold 20,grooves 14 are formed in the area where theprojections 18 have previously been situated, as shown inFIG. 1 . If need be, the inner contour of the plasticizingbarrel 1 may be finished by honing (precision grinding). - Of course, the
metal powder 22 or liquid melt may also be introduced during the centrifuging process. - An alternative to the afore-described manufacturing process of the plasticizing
barrel 1 involves the application of a two-step process to make thecoating 12. As shown inFIG. 6 , the inner wall surface of the hollow-cylindrical body 10 is lined initially with acoating 11, e.g. a wear-resisting protective layer, of constant thickness, preferably, through centrifugal casting, with thecoating 11 having an inner diameter of Di+2hN. Subsequently, thenegative mold 20 or a cage carrying theprojections 18, is inserted in the interior of the hollow-cylindrical body 10. An example of a suitable cage is shown inFIGS. 7 a and 7 b and involves the arrangement of two end rings 30 (only one is shown here) between which theprojections 18 are secured. Thereafter,metal powder 22 is introduced into the intermediate spaces between the projections of the negative mold (or centrally into the hollow space of the cage), and the hollow-cylindrical body 10 withcoating 11 and thenegative mold 20 are subjected to a further centrifugal casting process to form thecoating 12 with an inner diameter Di and with thegrooves 14 in a manner described in conjunction with the previous embodiment. Suitably, the areas of theinitial coating 11 where theprojections 18 are situated are honed, before thenegative mold 20 or the cage are placed into the hollow-cylindrical body 10 so that the finished plasticizingbarrel 1 has very smooth groove bases. - In this variation of the process according to the present invention, the
initial coating 11 is thick enough to allow theprojections 18 to automatically bear against thecoating 11 so that the need for a separate centering of thenegative mold 20 or the cage is eliminated. - The
negative mold 20 or cage may be used repeatedly. After a number of uses, finishing works, such as polishing, coating, may be suitable. - Since the diameter of the
base body 16 of thenegative mold 20 is smaller than the inner diameter Di of the finished plasticizingbarrel 1, i.e. the groove height hN is smaller than the height of theprojections 18, the surface of thecoating 12 between thegrooves 14 is ensured to have a very even and smooth configuration as a consequence of the centrifugal forces. - Depending on the stress the
plasticizing barrel 1 is subjected, various alloys may be used as protective layer. These alloys are known to the person skilled in the art so that a detailed description thereof is omitted for the sake of simplicity. - As shown in
FIG. 8 , theprojections 18 of the negative mold or cage may be coated with an adhesion-reducing layer and/or wear-reducing layer, as indicated byreference numeral 23. As an alternative, it is, of course, also conceivable to configure theprojections 18 in the direction in which thenegative mold 20 is removed from the coated hollow-cylindrical body 16, indicated byarrow 24, so as to have increasing width in circumferential direction, as shown in FIG. 9 a, and/or increasing height in radial direction, as shown inFIG. 9 b. - Although, centrifugal casting is a currently preferred process to make a
plasticizing barrel 1 according to the present invention, other forming process may also be applicable, without departing from the spirit of the present invention. Other forming processes may involve, however, also different dimensioning of the negative mold. - While the invention has been illustrated and described in connection with currently preferred embodiments shown and described in detail, it is not intended to be limited to the details shown since various modifications and structural changes may be made without departing in any way from the spirit of the present invention. The embodiments were chosen and described in order to best explain the principles of the invention and practical application to thereby enable a person skilled in the art to best utilize the invention and various embodiments with various modifications as are suited to the particular use contemplated.
- What is claimed as new and desired to be protected by Letters Patent is set forth in the appended claims and their equivalents:
Claims (10)
1. A plasticizing barrel for a plastics processing machine, comprising:
a body having a hollow cylindrical configuration and defining an axis; and
a coating lining an inner wall surface of the body and including at least one groove extending in axial direction of the body.
2. The plasticizing barrel of claim 1 , wherein the at least one groove has a helical configuration.
3. The plasticizing barrel of claim 1 , wherein the coating is a wear-resisting protective layer.
4. A negative mold for carrying out a method of making a plasticizing barrel for a plastics processing machine, comprising a base body defining an axis and formed with projections extending in direction of the axis, said base body defined by a diameter which is smaller than an end inner diameter of a plasticizing barrel lined on an inner wall surface with a coating.
5. The negative form of claim 4 , wherein the base body with the projections define an outer diameter which is smaller than the inner diameter of the hollow-cylindrical body by twice a thickness of the coating.
6. The negative mold of claim 4 , wherein the base body has a cylindrical configuration.
7. The negative mold of claim 4 , wherein the projections have a surface lined with at least one coating selected from the group consisting of adhesion-reducing coating and wear-reducing coating.
8. The negative mold of claim 4 , wherein the projections extend in axial direction of the base body and has, in the direction in which the negative mold is removed from a hollow-cylindrical body, at least a configuration selected from the group consisting of increasing width in circumferential direction and increasing height in radial direction.
9. The negative mold of claim 4 , wherein the projections have a helical configuration.
10. A negative mold for carrying out a method of making a plasticizing barrel for a plastics processing machine, comprising a cage defining an axis and including projections extending in direction of the axis.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US10/980,635 US20050064059A1 (en) | 2002-02-14 | 2004-11-03 | Plasticizing barrel lined on the inside with a coating, and method of making such a plasticizing barrel |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10206169.6-16 | 2002-02-14 | ||
DE10206169A DE10206169B4 (en) | 2002-02-14 | 2002-02-14 | Process for producing a plasticizing cylinder with an inner coating |
US10/361,781 US6997235B2 (en) | 2002-02-14 | 2003-02-10 | Plasticizing barrel lined on the inside with a coating, and method of making such a plasticizing barrel |
US10/980,635 US20050064059A1 (en) | 2002-02-14 | 2004-11-03 | Plasticizing barrel lined on the inside with a coating, and method of making such a plasticizing barrel |
Related Parent Applications (1)
Application Number | Title | Priority Date | Filing Date |
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US10/361,781 Division US6997235B2 (en) | 2002-02-14 | 2003-02-10 | Plasticizing barrel lined on the inside with a coating, and method of making such a plasticizing barrel |
Publications (1)
Publication Number | Publication Date |
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US20050064059A1 true US20050064059A1 (en) | 2005-03-24 |
Family
ID=27618697
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
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US10/361,781 Expired - Fee Related US6997235B2 (en) | 2002-02-14 | 2003-02-10 | Plasticizing barrel lined on the inside with a coating, and method of making such a plasticizing barrel |
US10/980,635 Abandoned US20050064059A1 (en) | 2002-02-14 | 2004-11-03 | Plasticizing barrel lined on the inside with a coating, and method of making such a plasticizing barrel |
Family Applications Before (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US10/361,781 Expired - Fee Related US6997235B2 (en) | 2002-02-14 | 2003-02-10 | Plasticizing barrel lined on the inside with a coating, and method of making such a plasticizing barrel |
Country Status (4)
Country | Link |
---|---|
US (2) | US6997235B2 (en) |
EP (1) | EP1336465A1 (en) |
CA (1) | CA2418821A1 (en) |
DE (1) | DE10206169B4 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20100097168A1 (en) * | 2006-10-11 | 2010-04-22 | Wolfgang Hahn | Cladding element with an integrated reception unit for the contactless transfer of electrical energy and method for the production thereof |
CN103568273A (en) * | 2013-11-01 | 2014-02-12 | 苏州泰科尼光伏材料有限公司 | EVA (ethylene-vinyl acetate copolymer) adhesive particle heating pipeline |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
AT413269B (en) * | 2004-07-08 | 2006-01-15 | Theysohn Extrusionstechnik Ges | HOUSING FOR A DOUBLE SCREW EXTRUDER AND MANUFACTURING METHOD |
DE102006044913B4 (en) * | 2006-09-22 | 2010-05-27 | Adcuram Maschinenbauholding Gmbh | Method and device for injection molding |
DE102008027051A1 (en) * | 2008-06-06 | 2009-12-10 | Kraussmaffei Technologies Gmbh | injection unit |
DE102010048925B4 (en) * | 2010-10-19 | 2014-08-28 | Poloplast Gmbh & Co. Kg | Extruder for processing plastics |
DE102016119858A1 (en) | 2016-10-18 | 2018-04-19 | Kraussmaffei Technologies Gmbh | Cylinder for a plastic processing machine |
DE102018213766A1 (en) * | 2018-08-16 | 2020-02-20 | Coperion Gmbh | Housing component for producing a housing of a multi-shaft screw machine and method for producing a housing component |
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US3587720A (en) * | 1968-09-20 | 1971-06-28 | Sandusky Foundry & Machine Co | Apparatus for centrifugally casting an article with an internal flange |
US3631917A (en) * | 1969-09-15 | 1972-01-04 | Dana Corp | Centrifugal casting mold with free flowing particulate heat transfer means |
US3771755A (en) * | 1971-06-28 | 1973-11-13 | Krupp Ag Huettenwerke | Centrifugal casting mold |
US4129386A (en) * | 1976-06-01 | 1978-12-12 | Akzona Incorporated | Extrusion apparatus |
US4327859A (en) * | 1977-11-22 | 1982-05-04 | Firma Friedrich Theysohn | Method of coating dual-worm extruder bores |
US4439041A (en) * | 1981-04-07 | 1984-03-27 | Paul Kiefel Gmbh | Feed bushing for single-screw extruders |
US4766042A (en) * | 1987-02-27 | 1988-08-23 | Otani Tony U | Plastics processing machine components and alloy for use therein |
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US5565277A (en) * | 1993-11-04 | 1996-10-15 | Xaloy, Inc. | Injection molding and extrusion barrels and alloy compositions thereof |
US6197437B1 (en) * | 1999-02-22 | 2001-03-06 | Wall Colmonoy Corporation | Casting alloys and method of making composite barrels used in extrusion and injection molding |
US20030128625A1 (en) * | 2002-01-07 | 2003-07-10 | Cabler Roy W. | Process for improving the production rate of compounding mixers |
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JP2002036033A (en) * | 2000-07-31 | 2002-02-05 | Daido Steel Co Ltd | Coating method for metallic structure interior surface |
-
2002
- 2002-02-14 DE DE10206169A patent/DE10206169B4/en not_active Expired - Fee Related
-
2003
- 2003-02-05 EP EP03002447A patent/EP1336465A1/en not_active Withdrawn
- 2003-02-10 US US10/361,781 patent/US6997235B2/en not_active Expired - Fee Related
- 2003-02-13 CA CA002418821A patent/CA2418821A1/en not_active Abandoned
-
2004
- 2004-11-03 US US10/980,635 patent/US20050064059A1/en not_active Abandoned
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Publication number | Priority date | Publication date | Assignee | Title |
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US3587720A (en) * | 1968-09-20 | 1971-06-28 | Sandusky Foundry & Machine Co | Apparatus for centrifugally casting an article with an internal flange |
US3631917A (en) * | 1969-09-15 | 1972-01-04 | Dana Corp | Centrifugal casting mold with free flowing particulate heat transfer means |
US3771755A (en) * | 1971-06-28 | 1973-11-13 | Krupp Ag Huettenwerke | Centrifugal casting mold |
US4129386A (en) * | 1976-06-01 | 1978-12-12 | Akzona Incorporated | Extrusion apparatus |
US4327859A (en) * | 1977-11-22 | 1982-05-04 | Firma Friedrich Theysohn | Method of coating dual-worm extruder bores |
US4439041A (en) * | 1981-04-07 | 1984-03-27 | Paul Kiefel Gmbh | Feed bushing for single-screw extruders |
US4863661A (en) * | 1986-08-25 | 1989-09-05 | Xaloy, Inc. | Resin molding process employing a mickel-based alloy liner |
US4766042A (en) * | 1987-02-27 | 1988-08-23 | Otani Tony U | Plastics processing machine components and alloy for use therein |
US5221821A (en) * | 1992-01-10 | 1993-06-22 | Crompton & Knowles Corporation | Method for producing an extruder barrel assembly |
US5565277A (en) * | 1993-11-04 | 1996-10-15 | Xaloy, Inc. | Injection molding and extrusion barrels and alloy compositions thereof |
US6197437B1 (en) * | 1999-02-22 | 2001-03-06 | Wall Colmonoy Corporation | Casting alloys and method of making composite barrels used in extrusion and injection molding |
US20030128625A1 (en) * | 2002-01-07 | 2003-07-10 | Cabler Roy W. | Process for improving the production rate of compounding mixers |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20100097168A1 (en) * | 2006-10-11 | 2010-04-22 | Wolfgang Hahn | Cladding element with an integrated reception unit for the contactless transfer of electrical energy and method for the production thereof |
US7907041B2 (en) * | 2006-10-11 | 2011-03-15 | Thyssenkrupp Transrapid Gmbh | Cladding element with an integrated reception unit for the contactless transfer of electrical energy and method for the production thereof |
CN103568273A (en) * | 2013-11-01 | 2014-02-12 | 苏州泰科尼光伏材料有限公司 | EVA (ethylene-vinyl acetate copolymer) adhesive particle heating pipeline |
Also Published As
Publication number | Publication date |
---|---|
US20030173710A1 (en) | 2003-09-18 |
EP1336465A1 (en) | 2003-08-20 |
CA2418821A1 (en) | 2003-08-14 |
DE10206169A1 (en) | 2003-09-04 |
US6997235B2 (en) | 2006-02-14 |
DE10206169B4 (en) | 2004-01-29 |
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Legal Events
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STCB | Information on status: application discontinuation |
Free format text: EXPRESSLY ABANDONED -- DURING EXAMINATION |