CA1160809A - Variable profile extrusion method and apparatus and products produced thereby - Google Patents
Variable profile extrusion method and apparatus and products produced therebyInfo
- Publication number
- CA1160809A CA1160809A CA000338909A CA338909A CA1160809A CA 1160809 A CA1160809 A CA 1160809A CA 000338909 A CA000338909 A CA 000338909A CA 338909 A CA338909 A CA 338909A CA 1160809 A CA1160809 A CA 1160809A
- Authority
- CA
- Canada
- Prior art keywords
- orifice
- die
- extrusion
- article
- profile
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Landscapes
- Extrusion Moulding Of Plastics Or The Like (AREA)
Abstract
S P E C I F I C A T I O N
VARIABLE PROFILE EXTRUSION METHOD AND APPARATUS
AND PRODUCTS PRODUCED THEREBY
Inventor: Clyde W. Vassar ABSTRACT OF THE DISCLOSURE
An improved method and apparatus is described for varying the periphery of the profile as seen in cross section of an elongated extrudate article. The method and apparatus provides for varying the profile of an extrusion orifice while an extrudate stock material is being forced through the orifice for producing an elongated article having a varying profile configuration along its length. The utility of this variable profile extrusion method and apparatus is that an elongated extruded article is formed having a vary-ing profile which varies in cross-section configuration as seen taking cross-sections at various points along the length of the article.
VARIABLE PROFILE EXTRUSION METHOD AND APPARATUS
AND PRODUCTS PRODUCED THEREBY
Inventor: Clyde W. Vassar ABSTRACT OF THE DISCLOSURE
An improved method and apparatus is described for varying the periphery of the profile as seen in cross section of an elongated extrudate article. The method and apparatus provides for varying the profile of an extrusion orifice while an extrudate stock material is being forced through the orifice for producing an elongated article having a varying profile configuration along its length. The utility of this variable profile extrusion method and apparatus is that an elongated extruded article is formed having a vary-ing profile which varies in cross-section configuration as seen taking cross-sections at various points along the length of the article.
Claims (30)
1. A method for extruding an elongated article having a profile which remains the same in at least one radial direction along its length and which may be varied in a plurality of other radial directions along its length com-prising the steps of:
forming an orifice in a fixed die member which is stationary in at least one radial direction and which may be varied in a plurality of other radial directions using a plurality of movable extrusion die members, forcing a thermoplastic extrudate stock material in flowable form through said orifice, and varying the position of at least two of said movable die members within said orifice while forcing said stock material through said orifice thereby maintaining the profile the same in at least one radial direction while simultaneously varying the profile of the orifice in at least two other radial direc-tions for forming an elongated extrudate article having a constant profile in at least one radial direction and a vary-ing profile in at least two radial directions conforming to the varying profile of said orifice.
forming an orifice in a fixed die member which is stationary in at least one radial direction and which may be varied in a plurality of other radial directions using a plurality of movable extrusion die members, forcing a thermoplastic extrudate stock material in flowable form through said orifice, and varying the position of at least two of said movable die members within said orifice while forcing said stock material through said orifice thereby maintaining the profile the same in at least one radial direction while simultaneously varying the profile of the orifice in at least two other radial direc-tions for forming an elongated extrudate article having a constant profile in at least one radial direction and a vary-ing profile in at least two radial directions conforming to the varying profile of said orifice.
2. The method of claim 1, wherein said article is formed during an extrudate forming cycle and the position of said members is varied continuously during said cycle.
3. The method of claim 1, wherein said article is formed during an extrudate forming cycle and the position of said members is varied during a part of said cycle.
4. The method of claim 1, wherein the positions of at least three members are varied while forcing said stock material through said orifice.
5. An apparatus for extruding an elongated article having a cross section profile which varies along the length of the article comprising:
a stationary die block, a plurality of movable die members, said stationary die block and said movable die members forming an extrusion orifice having a peripheral extru-sion profile which varies as seen in cross section with movement of said movable die members, means for forcing an extrudate stock -through said orifice to form an elongated extrudate article having a cross sectional profile conforming at each moment to the cross sectional profile of said orifice at the moment when said extrudate stock is being forced through said orifice, and means for causing the simultaneous movement of each of said movable die members during the passage of stock extru-date through said orifice for providing a varying peripheral orifice profile.
a stationary die block, a plurality of movable die members, said stationary die block and said movable die members forming an extrusion orifice having a peripheral extru-sion profile which varies as seen in cross section with movement of said movable die members, means for forcing an extrudate stock -through said orifice to form an elongated extrudate article having a cross sectional profile conforming at each moment to the cross sectional profile of said orifice at the moment when said extrudate stock is being forced through said orifice, and means for causing the simultaneous movement of each of said movable die members during the passage of stock extru-date through said orifice for providing a varying peripheral orifice profile.
6. The extrusion apparatus of claim 5, wherein said means for causing the simultaneous movement of each of said movable die members includes a rotatable, annular ring-shaped body which is rotatable about an axis, said annular body having a plurality of grooves formed therein, said grooves each being inclined with respect to said axis, and means for providing mechanical engagement between the respec-tive grooves in said annular body and the respective movable die members, whereby rotary movement of said annular body about said axis causes said simultaneous movement of said movable die members.
34 Apparatus for extruding an elongated article in which the shapes of various portions of the periphery as seen in cross section taken at various locations along the length of -the article are different comprising:
die means defining portions of the periphery of an extrusion orifice having an axis and also defining a plurality of channels extending inwardly toward the orifice;
a plurality of die members being movably mounted in said channels and being movable along said channels closer to and further from the axis of said extrusion orifice;
said plurality of die members defining other portions of the periphery of said extrusion orifice;
said extrusion orifice being adapted for having extrudate stock forced -there-through in the axial direction for extruding said elongated article; and controllable drive means coupled to each of said die member for moving the respective die members along said channels closer to and further from said axis for varying the shapes of various portions of the periphery of said ex-trusion orifice as the extrudate stock is being extruded through said extrusion orifice for extruding said elongated article in which the shapes of various portions of the periphery as seen in cross section taken at various locations along the length of the article are different.
die means defining portions of the periphery of an extrusion orifice having an axis and also defining a plurality of channels extending inwardly toward the orifice;
a plurality of die members being movably mounted in said channels and being movable along said channels closer to and further from the axis of said extrusion orifice;
said plurality of die members defining other portions of the periphery of said extrusion orifice;
said extrusion orifice being adapted for having extrudate stock forced -there-through in the axial direction for extruding said elongated article; and controllable drive means coupled to each of said die member for moving the respective die members along said channels closer to and further from said axis for varying the shapes of various portions of the periphery of said ex-trusion orifice as the extrudate stock is being extruded through said extrusion orifice for extruding said elongated article in which the shapes of various portions of the periphery as seen in cross section taken at various locations along the length of the article are different.
8. Apparatus for extruding an elongated article as claimed in claim 7, in which:
said controllable drive means includes a ring-shaped body extending around said axis and being movable about said axis;
said ring-shaped body has a plurality of cam surfaces, a plurality of cam followers, respective cam followers engag-ing the respective cam surfaces and being connected to the respective die members for moving said respective die members along said channels closer to and further from the axis of said extrusion orifice as said ring-shaped body is moved about said axis; and controllable means acting on said ring-shaped body for moving said ring-shaped body about said axis for moving said die members along said channels for varying the shapes of various portions of the periphery of said extrusion orifice as the extrudate stock is being extruded therethrough
said controllable drive means includes a ring-shaped body extending around said axis and being movable about said axis;
said ring-shaped body has a plurality of cam surfaces, a plurality of cam followers, respective cam followers engag-ing the respective cam surfaces and being connected to the respective die members for moving said respective die members along said channels closer to and further from the axis of said extrusion orifice as said ring-shaped body is moved about said axis; and controllable means acting on said ring-shaped body for moving said ring-shaped body about said axis for moving said die members along said channels for varying the shapes of various portions of the periphery of said extrusion orifice as the extrudate stock is being extruded therethrough
9. An apparatus for extruding an elongated article having a profile as seen in cross section which varies along the length of the article, comprising:
an extrusion die means having a plurality of die members;
said die means having an extrusion orifice formed -therein by said die members;
said orifice having a periphery establishing an orifice profile which is defined by edge segments of said die members;
means for forcing an extrudate stock material through said orifice during an extrusion cycle to form an elongated extrudate article having a profile as seen in cross section conforming -to the profile of said orifice;
automatic position varying means for varying a position of an edge segment of at least one of said die members from an initial position at the initiation of an ex-trusion cycle and for restoring said edge segment to said ini-tial position at the termination of said extrusion cycle, said automatic position varying means including cam drive means for varying the position of said die member in one direction and a pneumatic cylinder and piston for applying a force to said die member to move it in the opposite direction for re-storing said die member to its initial position, whereby the operation of said cam drive means varies the periphery of the profile of said orifice as said stock material is forced therethrough during an extrusion cycle for providing an elongated extrudate article having peripheral profile as seen in cross section.
an extrusion die means having a plurality of die members;
said die means having an extrusion orifice formed -therein by said die members;
said orifice having a periphery establishing an orifice profile which is defined by edge segments of said die members;
means for forcing an extrudate stock material through said orifice during an extrusion cycle to form an elongated extrudate article having a profile as seen in cross section conforming -to the profile of said orifice;
automatic position varying means for varying a position of an edge segment of at least one of said die members from an initial position at the initiation of an ex-trusion cycle and for restoring said edge segment to said ini-tial position at the termination of said extrusion cycle, said automatic position varying means including cam drive means for varying the position of said die member in one direction and a pneumatic cylinder and piston for applying a force to said die member to move it in the opposite direction for re-storing said die member to its initial position, whereby the operation of said cam drive means varies the periphery of the profile of said orifice as said stock material is forced therethrough during an extrusion cycle for providing an elongated extrudate article having peripheral profile as seen in cross section.
10. The apparatus of claim 9, wherein the edge segments of a plurality of said die members are varied in position for varying the profile of said orifice.
11. The apparatus of claim 10, wherein said die members having edge segments thereof defining the periphery of said orifice include at least one stationary member.
12. An apparatus for extruding an elongated article having a cross sectional profile which varies along the length of the article comprising:
a die plate having an aperture formed therein, a stationary die block, a plurality of movable die blocks, means for supporting said stationer and movable die blocks on said die plate and forming an extrusion orifice communicating with said aperture and having an extrusion profile whose cross sectional configuration varies with the movement of said movable die blocks means for forcing an extrudate stock through said aperture and through said orifice -to form an elongated ex-trudate article having a cross sectional profile conforming at each moment to the cross sectional profile of said orifice at the moment when said extrudate stock is being forced through said orifice, and means for causing the movement of said movable die blocks during the passage of stock extrudate through said orifice for providing said varying profile of the extrudate article which includes a rotatable, annular ring-shaped body having a groove formed therein and means for providing mechani-cal engagement between said groove in said annular body and said movable die blocks whereby rotary movement of said body causes said movement of said movable die blocks.
a die plate having an aperture formed therein, a stationary die block, a plurality of movable die blocks, means for supporting said stationer and movable die blocks on said die plate and forming an extrusion orifice communicating with said aperture and having an extrusion profile whose cross sectional configuration varies with the movement of said movable die blocks means for forcing an extrudate stock through said aperture and through said orifice -to form an elongated ex-trudate article having a cross sectional profile conforming at each moment to the cross sectional profile of said orifice at the moment when said extrudate stock is being forced through said orifice, and means for causing the movement of said movable die blocks during the passage of stock extrudate through said orifice for providing said varying profile of the extrudate article which includes a rotatable, annular ring-shaped body having a groove formed therein and means for providing mechani-cal engagement between said groove in said annular body and said movable die blocks whereby rotary movement of said body causes said movement of said movable die blocks.
13. The apparatus of claim 12, wherein said means for supporting said stationary die block on said die plate includes a stationary plate adapted to captivate said station-ary die block, said movable die blocks and said ring-shaped body, and means for securing said stationary plate to said die plate.
14. Apparatus for extruding an elongated article in which the shapes of various portions of the periphery as seen in cross section taken at various locations along the length of the article are different, a plurality of said portions of the periphery as seen in a predetermined cross section protruding farther from the axis of the article and intervening portions of said periphery as seen in said pre-determined cross section extending inwardly closer to the axis between each of said protruding portions, said apparatus comprising:
die means defining portions of the periphery of an extrusion orifice having an axis;
said extrusion orifice being adapted for having extrudate stock forced therethrough in -the axial direction for extruding said elongated article;
a plurality of die members movably mounted relative to said die means and each being movable laterally with respect to the flow of extrudate stock through said extrusion orifice for changing the shape of said orifice;
said plurality of movable die members defining other portions of the periphery of said extrusion orifice for forming said protruding portions of the article; and controllable drive means coupled to each of said movable die members for moving said die members relative to said die means for varying the shapes of said other portions of the periphery of said extrusion orifice as the extrudate stock is being extruded through said extrusion orifice for increasing and decreasing the extent by which said protrud-ing portions of the article project outwardly beyond said inter-vening portions, thereby extruding said elongated article in which the shapes of the periphery as seen in cross section taken at various locations along the length of the article are dif-ferent and in which said plurality of protruding portions project outwardly different distances from the axis of the article at different locations along the length of the article.
die means defining portions of the periphery of an extrusion orifice having an axis;
said extrusion orifice being adapted for having extrudate stock forced therethrough in -the axial direction for extruding said elongated article;
a plurality of die members movably mounted relative to said die means and each being movable laterally with respect to the flow of extrudate stock through said extrusion orifice for changing the shape of said orifice;
said plurality of movable die members defining other portions of the periphery of said extrusion orifice for forming said protruding portions of the article; and controllable drive means coupled to each of said movable die members for moving said die members relative to said die means for varying the shapes of said other portions of the periphery of said extrusion orifice as the extrudate stock is being extruded through said extrusion orifice for increasing and decreasing the extent by which said protrud-ing portions of the article project outwardly beyond said inter-vening portions, thereby extruding said elongated article in which the shapes of the periphery as seen in cross section taken at various locations along the length of the article are dif-ferent and in which said plurality of protruding portions project outwardly different distances from the axis of the article at different locations along the length of the article.
15. Apparatus for extruding an elongated article in which the shapes of various portions of the periphery as seen in cross section taken at various locations along the length of the article are different comprising:
die means defining portions of the periphery of an extrusion orifice;
said extrusion orifice being adapted for having extrudate stock forced therethrough in a predetermined flow direction for extruding said elongated article;
a plurality of die members movably mounted relative to said stationary die means and each being movable laterally with respect to the direction of flow of the extrudate stock;
said plurality of die members defining other portions of the periphery of said extrusion orifice in addition to the portions of the periphery defined by said die means;
a ring-shaped body encircling said extrusion orifice and being movable about said orifice;
said ring-shaped body having a plurality of cam surfaces respectively engaged by cam followers coupled to the respective die members for individually moving the respective die members laterally with respect to the direction of flow of the extrudate stock; and controllable drive means coupled to said ring-shaped body for moving said ring-shaped body about said orifice for moving said die members relative to said die means for vary-ing the shapes of various portions of the periphery of said extrusion orifice as the extrudate stock is being extruded therethrough for extruding an elongated article in which the shapes of various portions of the periphery are different as seen in cross section at various locations along the length of the article.
die means defining portions of the periphery of an extrusion orifice;
said extrusion orifice being adapted for having extrudate stock forced therethrough in a predetermined flow direction for extruding said elongated article;
a plurality of die members movably mounted relative to said stationary die means and each being movable laterally with respect to the direction of flow of the extrudate stock;
said plurality of die members defining other portions of the periphery of said extrusion orifice in addition to the portions of the periphery defined by said die means;
a ring-shaped body encircling said extrusion orifice and being movable about said orifice;
said ring-shaped body having a plurality of cam surfaces respectively engaged by cam followers coupled to the respective die members for individually moving the respective die members laterally with respect to the direction of flow of the extrudate stock; and controllable drive means coupled to said ring-shaped body for moving said ring-shaped body about said orifice for moving said die members relative to said die means for vary-ing the shapes of various portions of the periphery of said extrusion orifice as the extrudate stock is being extruded therethrough for extruding an elongated article in which the shapes of various portions of the periphery are different as seen in cross section at various locations along the length of the article.
16. An apparatus for extruding an elongated article having a cross sectional profile which varies along the length of the article comprising:
a die plate having an aperture formed therein;
a stationary die block;
a plurality of movable die blocks, said stationary die block and said movable die blocks being mounted on said die plate and forming an extrusion orifice having an axis and communicating with said aperture and having an extrusion profile whose cross sectional con-figuration varies with movement of said movable die blocks;
means for forcing an extrudate stock through said aperture and through said orifice to form an elongated ex-trudate article having a cross sectional profile conforming at each moment to the cross sectional profile of said orifice at the moment when said extrudate stock is being forced through said orifice;
means for causing the movement of said movable die blocks during the passage of stock extrudate through said orifice for providing a variable orifice profile which com-prises a rotatable ring-shaped body which is rotatable about the axis of said extrusion orifice, and controllable drive means acting on said rotatable ring-shaped body for providing relative rotary motion between said die plate and said ring-shaped body.
a die plate having an aperture formed therein;
a stationary die block;
a plurality of movable die blocks, said stationary die block and said movable die blocks being mounted on said die plate and forming an extrusion orifice having an axis and communicating with said aperture and having an extrusion profile whose cross sectional con-figuration varies with movement of said movable die blocks;
means for forcing an extrudate stock through said aperture and through said orifice to form an elongated ex-trudate article having a cross sectional profile conforming at each moment to the cross sectional profile of said orifice at the moment when said extrudate stock is being forced through said orifice;
means for causing the movement of said movable die blocks during the passage of stock extrudate through said orifice for providing a variable orifice profile which com-prises a rotatable ring-shaped body which is rotatable about the axis of said extrusion orifice, and controllable drive means acting on said rotatable ring-shaped body for providing relative rotary motion between said die plate and said ring-shaped body.
17. The apparatus of claim 16, wherein said controllable drive means for causing relative rotatable motion between said die plate and said rotary ring-shaped body comprises at least one hydraulically actuated piston and cylinder coupled between said die plate and said ring-shaped body, a servo valve means coupled with said ring-shaped body to be moved, an hydraulic fluid reservoir, pump and conduit means for conveying pressurized hydraulic fluid from said reservoir to said servo valve means and conduit means extending from said servo valve means to said hydraulically actuated cylinder, and a cam for actuating said servo valve means for causing said servo valve to enable flow of pressurized hydraulic fluid to said hydraulically actuated cylinder for controllably turning said ring-shaped body.
18. The apparatus of claim 17, including means for pro-ducing an amplified and more rapid movement of said ring-shaped body relative to the motion of said servo valve means comprising a pivotally supported mechanical linkage having first and second arms thereof providing a mechanically ampli-fied movement between said first and second arms, said servo valve being supported on said second arm in engagement with said cam, and said first arm being coupled to said rotatable ring-shaped body.
19. The apparatus of claim 18, wherein said cam has a rectilinear-shaped configuration and reciprocating drive means are provided for moving said cam back and forth.
20. The apparatus of claim 19, for continuously extrud-ing an alternating sequence of longer and shorter articles of the same relative variable profile proportions in which said reciprocating drive means moves said rectilinear-shaped cam more rapidly in one direction than in the other direction.
21. Apparatus for extruding an elongated article in which the shapes of various portions of the periphery as seen in cross section taken at various locations along the length of the article are different comprising:
stationary die means defining portions of the periph-ery of an extrusion ofifice having an axis;
a plurality of die members movably mounted with respect to said stationary die means and each being movable closer to and further from the axis of said extrusion orifice;
said plurality of die members defining other portions of the periphery of said extrusion orifice;
said extrusion orifice being adapted for having extrudate stock forced therethrough in the axial direction for extruding said elongated article;
a ring-shaped body encircling the axis of said extru-sion orifice and being movable about said axis;
said ring-shaped body having a plurality of cam surfaces for moving the respective die members closer to and further from the axis of said extrusion orifice as said ring-shaped body is rotated about said axis; and controllable means for moving said ring-shaped body about said axis for simultaneously moving said die members with respect to said die means for simultaneously varying the shapes of various portions of the periphery of said extrusion orifice as the extrudate stock is being extruded therethrough.
stationary die means defining portions of the periph-ery of an extrusion ofifice having an axis;
a plurality of die members movably mounted with respect to said stationary die means and each being movable closer to and further from the axis of said extrusion orifice;
said plurality of die members defining other portions of the periphery of said extrusion orifice;
said extrusion orifice being adapted for having extrudate stock forced therethrough in the axial direction for extruding said elongated article;
a ring-shaped body encircling the axis of said extru-sion orifice and being movable about said axis;
said ring-shaped body having a plurality of cam surfaces for moving the respective die members closer to and further from the axis of said extrusion orifice as said ring-shaped body is rotated about said axis; and controllable means for moving said ring-shaped body about said axis for simultaneously moving said die members with respect to said die means for simultaneously varying the shapes of various portions of the periphery of said extrusion orifice as the extrudate stock is being extruded therethrough.
22. Apparatus for extruding an elongated article in which the shapes of various portions of the periphery as seen in cross section taken at various locations along the length of the article are different comprising:
stationary die means defining portions of the periph-ery of an extrusion orifice having an axis;
said stationary die means also defining a plurality of channels extending inwardly toward said axis;
a plurality of die members;
a respective die member being movably mounted in each of said channels and being movable along its channel closer to and further from the axis of said extrusion orifice;
said plurality of die members defining other portions of the periphery of said extrusion orifice;
said extrusion orifice being adapted for having ex-trudate stock forced therethrough in the axial direction for extruding said elongated article; and controllable drive means coupled to each of said die members for simultaneously moving the respective die members along their respective channels for simultaneously varying the shapes of various portions of the periphery of said extrusion orifice as the extrudate stock is being extruded through said extrusion orifice for extruding said elongated article in which the shapes of various portions of the periphery as seen in cross section taken at various locations along the length of the article are different.
stationary die means defining portions of the periph-ery of an extrusion orifice having an axis;
said stationary die means also defining a plurality of channels extending inwardly toward said axis;
a plurality of die members;
a respective die member being movably mounted in each of said channels and being movable along its channel closer to and further from the axis of said extrusion orifice;
said plurality of die members defining other portions of the periphery of said extrusion orifice;
said extrusion orifice being adapted for having ex-trudate stock forced therethrough in the axial direction for extruding said elongated article; and controllable drive means coupled to each of said die members for simultaneously moving the respective die members along their respective channels for simultaneously varying the shapes of various portions of the periphery of said extrusion orifice as the extrudate stock is being extruded through said extrusion orifice for extruding said elongated article in which the shapes of various portions of the periphery as seen in cross section taken at various locations along the length of the article are different.
23. Apparatus for extruding an elongated article as claim-ed in claim 22, in which:
said controllable drive means includes a ring-shaped body extending around said axis and being movable about said axis;
said ring-shaped body has a plurality of cam surfaces for moving the respective die members along their respective channels closer to and further from the axis of said extrusion orifice as said ring-shaped body is moved about said axis; and controllable means acting on said ring-shaped body for moving said ring-shaped body about said axis for simultan-eously moving said die members along their respective channels for simultaneously varying the shapes of various portions of the periphery of said extrusion orifice as the extrudate stock is being extruded therethrough.
said controllable drive means includes a ring-shaped body extending around said axis and being movable about said axis;
said ring-shaped body has a plurality of cam surfaces for moving the respective die members along their respective channels closer to and further from the axis of said extrusion orifice as said ring-shaped body is moved about said axis; and controllable means acting on said ring-shaped body for moving said ring-shaped body about said axis for simultan-eously moving said die members along their respective channels for simultaneously varying the shapes of various portions of the periphery of said extrusion orifice as the extrudate stock is being extruded therethrough.
24. Variable profile extrusion apparatus for extruding plastic material to form an elongated article having a profile which varies along the length of the article comprising:
a stationary die block having an extrusion orifice extending therethrough and defining an extrusion path along which the plastic material is extruded, said stationary die block having a segment thereof adjacent to said extrusion orifice and defining a fixed portion of the periphery of said orifice, said stationary die block including a plurality of channels therein extending outwardly from said extrusion path, movable die member positioned in each channel and movable inwardly and outwardly along said channel toward and away from said extrusion path, said movable die members having a generally L-shaped configuration as seen in side elevation, a first leg of said L-shaped movable die member extending along said extrusion orifice and defining a movable portion of the periphery of said orifice, a second leg of said L-shaped movable die member extending outwardly along said channel, and actuator means for moving said movable die members inwardly and outwardly along said channel as the plastic material is being extruded through said orifice for varying the profile of said orifice, thereby varying the profile along at least a portion of the length of the elongated article being extruded.
a stationary die block having an extrusion orifice extending therethrough and defining an extrusion path along which the plastic material is extruded, said stationary die block having a segment thereof adjacent to said extrusion orifice and defining a fixed portion of the periphery of said orifice, said stationary die block including a plurality of channels therein extending outwardly from said extrusion path, movable die member positioned in each channel and movable inwardly and outwardly along said channel toward and away from said extrusion path, said movable die members having a generally L-shaped configuration as seen in side elevation, a first leg of said L-shaped movable die member extending along said extrusion orifice and defining a movable portion of the periphery of said orifice, a second leg of said L-shaped movable die member extending outwardly along said channel, and actuator means for moving said movable die members inwardly and outwardly along said channel as the plastic material is being extruded through said orifice for varying the profile of said orifice, thereby varying the profile along at least a portion of the length of the elongated article being extruded.
25. Variable profile extrusion apparatus, as claimed in claim 24, in which:
said segment of said stationary die block defining the fixed portion of the periphery of said orifice has a convergent entry region which converges in a downstream direc-tion toward the axis of the extrusion orifice, and ` said first leg of said L-shaped movable die members has a convergent entry region which converges in a downstream direction toward the axis of the extrusion orifice.
said segment of said stationary die block defining the fixed portion of the periphery of said orifice has a convergent entry region which converges in a downstream direc-tion toward the axis of the extrusion orifice, and ` said first leg of said L-shaped movable die members has a convergent entry region which converges in a downstream direction toward the axis of the extrusion orifice.
26. Variable profile extrusion apparatus, as claimed in claim 24, in which:
said actuator means includes an actuator ring en-circling the extrusion orifice and spaced outwardly therefrom, said stationary die block having associated therewith bearing means for rotatably mounting said actuator ring, said actuator ring including a cam surface which is inclined in the circumferential direction, said second leg of said L-shaped movable die members having cam follower means operatively associated therewith for moving said movable die members inwardly and outwardly along said channel, said cam follower means engaging said cam surface of said actuator ring, and drive means for turning said actuator ring for moving said movable die members to vary the profile of said extrusion orifice.
said actuator means includes an actuator ring en-circling the extrusion orifice and spaced outwardly therefrom, said stationary die block having associated therewith bearing means for rotatably mounting said actuator ring, said actuator ring including a cam surface which is inclined in the circumferential direction, said second leg of said L-shaped movable die members having cam follower means operatively associated therewith for moving said movable die members inwardly and outwardly along said channel, said cam follower means engaging said cam surface of said actuator ring, and drive means for turning said actuator ring for moving said movable die members to vary the profile of said extrusion orifice.
27. Variable profile extrusion apparatus, as claimed in claim 24, in which:
said stationary die block includes three of such channels uniformly spaced about the axis of the extrusion orifice, three of said movable die members are provided, one of said movable die members being positioned in each respective channel, said stationary die block including three fixed segments thereof respectively defining three fixed portions of the periphery of said orifice intermediate the respective movable die members, said three movable die members respectively defining three movable portions of said orifice intermediate the re-spectively fixed segments of said stationary die block, and said drive means simultaneously moves said three movable die members inwardly and outwardly, thereby to extrude an elongated article having three radial fins extending long-itudinally therealong and uniformly spaced about the axial length of said article and whereby the radial extent of all of said fins can be varied along at least a portion of the length of said article.
said stationary die block includes three of such channels uniformly spaced about the axis of the extrusion orifice, three of said movable die members are provided, one of said movable die members being positioned in each respective channel, said stationary die block including three fixed segments thereof respectively defining three fixed portions of the periphery of said orifice intermediate the respective movable die members, said three movable die members respectively defining three movable portions of said orifice intermediate the re-spectively fixed segments of said stationary die block, and said drive means simultaneously moves said three movable die members inwardly and outwardly, thereby to extrude an elongated article having three radial fins extending long-itudinally therealong and uniformly spaced about the axial length of said article and whereby the radial extent of all of said fins can be varied along at least a portion of the length of said article.
28. Variable profile extrusion apparatus for extruding thermoplastic material -to form an elongated article having a profile which varies along the length of the article com-prising:
a stationary die block having an extrusion orifice extending therethrough and defining an extrusion path along which the thermoplastic material is extruded, said stationary die block including a plurality of channels therein associated with said extrusion path, a plurality of movable die members, such die members being positioned in respective channels and being movable along such channel for changing the position of the die members relative to the extrusion path for changing the profile of said extrusion orifice, a rotatable ring-shaped body encircling said extrusion path and having a plurality of cam surfaces -thereon in driving relationship with said movable die members for causing said movable die members to change position relative to the extru-sion path, at least one hydraulically actuated cylinder and piston connected to said ring-shaped body for turning said body relative to said stationary die block, a source of hydraulic fluid under pressure, a control cam, servo valve means interconnected between said source and said hydraulically actuated cylinder and piston, said servo valve means engaging said control cam for controlling the flow of the pressurized hydraulic fluid to said cylinder and piston, and means for moving said servo valve means relative to said control cam in response to turning movement of said ring-shaped body.
a stationary die block having an extrusion orifice extending therethrough and defining an extrusion path along which the thermoplastic material is extruded, said stationary die block including a plurality of channels therein associated with said extrusion path, a plurality of movable die members, such die members being positioned in respective channels and being movable along such channel for changing the position of the die members relative to the extrusion path for changing the profile of said extrusion orifice, a rotatable ring-shaped body encircling said extrusion path and having a plurality of cam surfaces -thereon in driving relationship with said movable die members for causing said movable die members to change position relative to the extru-sion path, at least one hydraulically actuated cylinder and piston connected to said ring-shaped body for turning said body relative to said stationary die block, a source of hydraulic fluid under pressure, a control cam, servo valve means interconnected between said source and said hydraulically actuated cylinder and piston, said servo valve means engaging said control cam for controlling the flow of the pressurized hydraulic fluid to said cylinder and piston, and means for moving said servo valve means relative to said control cam in response to turning movement of said ring-shaped body.
29. Variable profile extrusion apparatus, as claimed in claim 28, in which:
said means for moving said servo valve means rela-tive to said control cam is a linkage between said ring-shaped body and said servo valve means enabling higher speed and greater amplitude of motion of said ring-shaped body relative to the fixed die block as compared to the relative motion between said servo valve means and said control cam.
said means for moving said servo valve means rela-tive to said control cam is a linkage between said ring-shaped body and said servo valve means enabling higher speed and greater amplitude of motion of said ring-shaped body relative to the fixed die block as compared to the relative motion between said servo valve means and said control cam.
30. Variable profile extrusion apparatus, as claimed in claim 28, in which:
a pair of hydraulically actuated cylinders and pistons are connected to said ring-shaped body on opposite sides there-of relative to said extrusion path in push-pull relationship for aiding each other in applying balanced driving torque forces to said body for turning it relative to said stationary die block.
a pair of hydraulically actuated cylinders and pistons are connected to said ring-shaped body on opposite sides there-of relative to said extrusion path in push-pull relationship for aiding each other in applying balanced driving torque forces to said body for turning it relative to said stationary die block.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000338909A CA1160809A (en) | 1979-10-31 | 1979-10-31 | Variable profile extrusion method and apparatus and products produced thereby |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000338909A CA1160809A (en) | 1979-10-31 | 1979-10-31 | Variable profile extrusion method and apparatus and products produced thereby |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1160809A true CA1160809A (en) | 1984-01-24 |
Family
ID=4115501
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000338909A Expired CA1160809A (en) | 1979-10-31 | 1979-10-31 | Variable profile extrusion method and apparatus and products produced thereby |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1160809A (en) |
-
1979
- 1979-10-31 CA CA000338909A patent/CA1160809A/en not_active Expired
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US4187068A (en) | Variable profile extrusion apparatus | |
| AU768191B2 (en) | Process for the manufacture of shaped articles | |
| US4256685A (en) | Variable profile extrusion method | |
| CN1273282C (en) | Method and apparatus for joining sheet-or ribbon formed flows in a coextrusion process | |
| US5057267A (en) | Apparatus and method for forming hollow parisons of variable wall thickness | |
| CN1158173C (en) | Electrically drive apparatus for ejecting injection molded parts | |
| US6602456B2 (en) | Method and device for actuating a press | |
| CA1097473A (en) | Molding press for plastic materials | |
| US3549072A (en) | High-power feed controlling gear for metallic pipe and rod materials | |
| CA1160809A (en) | Variable profile extrusion method and apparatus and products produced thereby | |
| CN116653243B (en) | Two-plate intelligent mode locking part based on multi-core control | |
| CN1035079A (en) | Follow-on extrusion equipment | |
| DE1900532A1 (en) | Altering the material distribution of a - thermoplastic preform from an extruder | |
| EP0402645B1 (en) | Apparatus for coating a thermoplastic part by means of injection moulding | |
| US6305266B1 (en) | Piston or plunger and a method for making the same | |
| CN110722765B (en) | Polymer extrusion die device capable of changing shape of die hole | |
| CA2181538A1 (en) | Variable section extrusion die set and variable extrusion molding method | |
| KR101991815B1 (en) | Mold closing apparatus | |
| US4308745A (en) | Hydraulic press | |
| EP3468767B1 (en) | Extruder device for manufacturing moulded components | |
| US5211970A (en) | Hydraulic clamping apparatus for an injection molding machine | |
| RU2101134C1 (en) | Device for continuous molding of articles from powders | |
| CN118204432B (en) | Accessory processing equipment is used in projecting apparatus production | |
| CA1128273A (en) | Control method and apparatus for producing uniform thickness corrugated tubing | |
| CN218985200U (en) | Thin-wall member forming mechanism and system thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |