CA2082977C - Injection molding machine - Google Patents
Injection molding machine Download PDFInfo
- Publication number
- CA2082977C CA2082977C CA002082977A CA2082977A CA2082977C CA 2082977 C CA2082977 C CA 2082977C CA 002082977 A CA002082977 A CA 002082977A CA 2082977 A CA2082977 A CA 2082977A CA 2082977 C CA2082977 C CA 2082977C
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- CA
- Canada
- Prior art keywords
- cylinder
- injecting
- advance
- retract
- carrier block
- 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 - Fee Related
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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
- B29C45/03—Injection moulding apparatus
- B29C45/07—Injection moulding apparatus using movable injection units
-
- 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
- B29C45/47—Means for plasticising or homogenising the moulding material or forcing it into the mould using screws
- B29C45/50—Axially movable screw
- B29C45/5008—Drive means therefor
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- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
- Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
Abstract
An injection molding machine comprises a carrier block, which contains a plasticizing cylinder and to which hydraulic advance-retract cylinders and hydraulic injecting cylinders are axially coupled. The cylinder barrel of each advance-retract cylinder carries an injecting piston for cooperating with an injecting cylinder barrel which surrounds the advance-retract cylinder barrel. Because each advance-retract cylinder barrel is integrally formed with a radial flange, which constitutes the injecting piston for cooperating with the associated injecting cylinder barrel, the injecting unit will be able to withstand high pressures and its parts can yet economically be made in series.
Description
BACKGROUND OF THE INVEIfTION
1. Field of the Invention This invention relates to an injection molding machine for processing synthetic resins and other plastic materials, comprising in an injecting unit a plasticizing cylinder, which is mounted in a carrier block, th at is axially coupled to at least two hydraulic advance-retract cylinders, which are symmetrically disposed with respect to the injection axis and serve to axially displace the injecting unit on stationary guide rods, on which advance-retract pistons are fixedly mounted, and at least two injecting cylinders, which are supported by and axially movable relative to the carrier block and are symmetrically disposed with respect to the injection axis and serve to axially drive a rotatable feed screw, which is pro~,rided in the plasticizing cylinder. Each of the advance-retract cylinders is coaxially surrounded by one of said injecting cylinders and carries an injecting piston for cooperating with said injecting cylinder.
Description of the Prior Art German Utility :yodel 70 46 62~ discloses an injecting unit of that kind, in which each actuating cylinder and the associated injecting cylinder are hydraulically connected in series in such a manner th at the two associated cylinders constitute a unit but are separately supplied with liquid under pressure.
_ 2 -The cylinders of each pair are nested one in the other and the injecting cylinder is mounted on the advance-retract cylinder in such a manner that the actuating cylinder carries the injecting piston cooperating with the associated injecting cylinder; th at injecting piston is secured in recesses of the advance-retract cylinder.
The advance-retract cylinder is indirectly secured to the carrier block and cannot be removed unless screws have been loosened and the advance-retract cylinder has been displaced to release an axial lock. For this reason a quick exchange of the advance-retract cylinders is prevented by the means by which they are fixed. The injecting cylinders are constituted by a casting, which also constitutes an injecting bridge.
U.S. Patent 4,668,178 discloses another injecting unit of that kind, in which the advance-retract cylinder barrels consist of non-cast steel barrels, which at one end are supported in corresponding annular shoulders of the carrier block. The associated sleevelike cylinder covers tightly enclose the guide rods and extend almost throughout the axial length of the bores of the carrier block and fit said bores without a play. For this reason the advance-retract cylinders cannot be operated until the injecting unit h as completely been mounted.
U.S. Patent 4,850,841 discloses another injecting unit, in which each advance-retract cylinder ~~~z~9 ~r~
and the associated injecting cylinder are separate from each other and separately mounted in the carrier block.
In that case the cylinders screw-connected to the carrier block can easily be replaced and their operativeness can be tested before they are installed. But the carrier block casting must be sufficiently large for accommo-dating a,11 cylinders. An increase of the size of the casting will give rise to increasingly stringent problems which are due to the formation of pipes during the casting process. Besides, such a carrying block will render an injection into the parting line of the mold more difficult in an upright injecting unit.
Finally, it is known from U.S. Patent 5,129,816 that the coaxial arrangement of th a cylinders can be improved in that they are adjustably mounted on the carrier block by means of a plurality of screws, which are parallel to the injection axis and arranged approx-imately on a circular line.
SUMMARY OF THE INVENT ION
In view of the x~rior art discussed hereinbefore it is an object of the invention to provide an injecting molding machine which is of the kind described first hereinbefore and in which the injecting unit meets the increasing requirements, particularly as regards the transmission of strong forces, whereas the requirements for an economical series manufacture are also met.
That object is accomplished in accordance with the inventien in that each advance-retract cylinder barrel is integrally formed with a radial flange, which constitutes an injecting piston for cooperating with an associated injecting cylinder.
Each advance-retract cylinder barrel is formed during its manufacture with the injecting piston for cooperation with an associated injecting cylinder.
Because that injecting piston is integral with the cylinder barrel it can take up even high pressures without an arising of problems and without a risk of leakage. Machining can be effected in a simple manner because any dimensional tolerances, particularly of the outside surfaces of the cylinder barrel, are less significant than, e.g., dimensional tolerances of the recesses provided in the prior art for receiving the injecting piston. Besides, the much lower structural expenditure and space requirement of the means f or fixing the cylinder barrels and the much smaller space required for such means permit an injection through an axial sprue and into the parting line.
According to a preferred feature each advance-retract cylinder barrel and the associated injecting cylinder barrel constitute a unit, which is adapted to be fixed in the carrier block by a cylinder cover provided on the advance-retract cylinder barrel and consist of respective non-cast steel barrels. In that ~~a~a ~
case the unit comprising the two nested cylinders pref-erably includes also the injecting bridge and can be fitted into the bores of the carrier block with a relatively small amount of work. Besides, it is possible before the assembling to test the operativeness of each advance-retract cylinder and the associated injecting cylinder because in that case it will be sufficient to close the advance-retract cylinder with the cylinder cover. In the premises of the user it will then be possible in case of a shutdown to effect a replacement even by moderately skilled staff because it is again sufficient to remove only the forward cylinder cover in order to detach the advance-retract cylinders from the carrier block. The cyl nder barrels consist of non-cast steel because it h as been found in practice that the use of castings will give rise to difficulties particularly under high pressures as pipes are formed during the casting operation and, by experience, rendex almost 25% of the castings inoperative. The use of non-cast steel barrels will also facilitate the manu-facture of the advance-retract cylinder barrel which is integrally formed with an injecting piston because that piston can simply be formed out of the wall of the cylinder.
According to a preferred feature the cylinder cover of each advance-retract cylinder is fixed to the carrier block by a plurality of fixing screws, which are - 6 _ ~~~~~ i'~
parallel to the injection axis and arranged approximately on a circular line. In that case each advance-retract cylinder barrel is larger in diameter adjacent to the injecting bridge so that the cylinder space available for retracting the feed screw is decreased. This affords the advantage that the feed screw can be retracted at a higher speed which is higher than the speed of the advancing movement which is imp arted to the feed screw during the injecting operation and is effected by the fluid in the other space of the cylinder.
Besides, the use of cylinder spaces which differ in size i.s an essential requirement for the control of the movements, particularly if the holding pressure is to be controlled.
According to a preferred feature each cylinder chamber of each injecting cylinder is supplied with liquid under pressure through a supply passage and a succeeding annular passage, which is provided adjacent to the associated cylinder cover and terminates in an outlet, and hydraulic valves are provided adjacent to the injecting bridge and are connected to said cylinder chambers by rigid lines, which have identical cross-sections and are symmetrically arranged with respect to the injection axis. Owing to the supply of the liquid under pressure through an annular passage the hydraulic liquid flows uniformly into said cylinder chambers. If the outlet is provided at the top end of _ 7 _ the annular passage, it will be possible to effectively suppress undesired accompanying phenomena, such as an occurrence of air bubbles. An exact control of the pressure in associated cylinder chambers can be effected because rigid lines rather than elastic lines are provided so that the pressure in the cylinder chambers will not be influenced by an elasticity of the material of the lines. The symmetrical arrangement of all lines and their identical cross-sections also will contribute to an avoiding of problems in the control or automatic control of pressure.
BRIEF DESCRIPTTON OF THE DRAWING
Figure 1 is a top plan view showing an injecting unit.
Figure 2 is a side elevation showing the injecting unit of Figure 1.
Figure 3 is a horizontal sectional view taken on a plane on the level of the guide rods and showing the injecting unit on a larger scale.
Figure 4 is a vertical sectional view showing a guide rod of Figure 3.
Figures 5, 6, 7 are sectional views showing the injecting unit of Figure 1 and taken on lines V-V, VI-VI, and VII-VII, respectively, in Figure 1.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIT~IENT
An illustrative embodiment of the invention will now be described with reference to the drawings, _ g _ (~ C~ F rv r and further advantages afforded by the invention ~~1~' ~ ~ ~
become apparent from said description.
The illustrated injecting unit comprises a carrier blocx 10, in which a plasticizing cylinder 17 is mounted by means of a nut 34. The plasticizing cylinder 17 is a component of a plasticizing sub-unit, which is provided with heating means. The plasticizing cylinder 17 has a longitudinal center line and is so mounted in the carrier block 10 that said longitudinal center line constitutes an injection axis s-s. The carrier block 10 h as two wing portions 10a, which are formed with respective bores 10b, which axe sym-metrical to the injection axis s-s and contain respective hydraulic advance-retract cylinders A for axially displacing the injecting unit on guide rods 19 of the injection molding machine. Said guide rods 19 are provided with fixed annular advance-retract pis-tons 32, which are axially slidably sealed in the advance-retract cylinders. The guide rods 19 are axially fixed to a stationary mold carrier of the injection molding machine, which is intended to process synthetic resins or other plastic materials, such as ceramic compositions. Each advance-retract cylinder A
comprises two cylinder covers 13, 14, a barrel 18, which is made of non-cast steel, and an advance-retract piston 22, which is provided on a guide rod 19.
Two hydraulic injection cylinders E are t provided, which are also symmetrical with respect to the injection axis s-s and serve for axially displacing a feed screw 35, which is contained in the plasticizing cylinder 17. The cylinder barrel 18 of each advance-retract cylinder A carries an injecting piston 18b, which is axially slidably sealed in the cylinder barrel 11 of an associated injecting cylinder E.
The steel barrel 11 of each injecting cylinder E
coaxially surrounds and is radially spaced from the steel barrel 18 of an associated advance-retract cylinder A. More than two sets of advance-retract and injecting cylinders may be provided around the injection axis s-s.
The injecting piston for cooperating with each injection cylinder consists of a radial flange 18b, which is provided on the cylinder barrel 18 of the associated advance-.retract cylinder and is integrally formed with the barrel 18 that is made of non-cast steel; but a different arrangement is also possible.
As is apparent from Figure 2 the advance-retract cylinders A are freely carried by the carrier block 10 in such a manner that two-thirds of the length of the advance-retract cylinders A protrude rearwardly out of the wings 10a. On the other hand, the injecting cylinders project rearwardly out of the advance-retract cylinders and are fixed in an injecting bridge 25, which carries a motor 26 for rotating the feed screw and comprises a bearing block, in which means are movably mounted which serve to transmit torque from the drive motor 26 to the feed screw 35.
The advance-retract cylinders A, the injecting cylinders E, and the injecting bridge 25 constitute a sub-unit, which is anchored in the carrier block 10.
For that purpose a cylinder cover 13 of each advance-retract cylinder A is fixed to the carrier block by a plurality of fixing screws 21, which are approximately parallel and are approximately arranged on a circular line. Said fixing screv~is are screwed into an adjusting nut 30, which is screwed on the forward end portion 18e of the steel barrel 18 of an associated advance-retract cylinder A and constitutes the means with which the sub-unit A, E, 25 engages the carrier block 10. Each guide rod 19 is provided with a radial ring 19c, to which an annul ar piston 22 is ffixed. Each guide rod 19 is formed with two axial bores, which constitute passages 19a, 19b for supplying liquid under pressure to the cylinder chambers 15 and 16 contained in each advance-retract cylinder A on both sides of the annular piston 22. The cylinder chambers 15, 16 are defined by the guide rod 19, which serves as a piston rod, by the annular piston 19, and by the steel barrel 18. The cylinder chamber 16 is axially defined by the piston 22 and the cylinder cover 14, which has been screwed into internal screw threads 18d formed in the adjacent end ~~~;~'~ ~~~
portion of the steel barrel 18. The cylinder chamber 16 is supplied with liquid under pressure when it is desired to retract the injecting unit from the mold plate. The other cylinder ch amber 15 of each advance--retract cylinder is disposed in front of the cylinder chamber 16 and serves to advance the injecting unit toward the mold plate. The cylinder chamber 15 is axially defined by the annular piston 22 and the cylinder cover 13, which may be mounted on the cylinder barrel 18 before the final assembly so that the cylinder can be tested for op-erativeness. liquid under pressure can be supplied to the annular piston 22 from both sides.
Each steel barrel 18 is integral with an injecting piston for cooperating with an associated injecting cylinder E and constitutes also a piston rod for the associated injecting cylinder E. Each steel barrel 18 is axially movably mounted in an annular piston rod guide 31, which is secured in a recess 25b of the injecting bridge 25. A plurality of screws 32 extend through the piston rod guide 31 and are screwed into the injecting bridge 25. The radial flange 18b provided on the steel barrel 18 axially defines two cylinder chambers 28, 29, which are supplied with liquid under pressure on either side of the flange 18b in order to axially move the feed screw 35. By a supply of liquid under pressure to the cylinder ch amber 28 the feed screw 35 is moved ~~~a~z~ ~~~
toward the mold plate. The cylinder chamber 28 is axially defined also by the cylinder cover 12, which is connected to the injecting bridge 25 by clamp screws 23 (Fig-ures 1, 2). >i'or that purpose the steel barrels 11 are also held in centering recesses 25a formed in the injecting bridge 25. The cylinder barrels 11 comprise end portions 11a, which are smaller in diameter and fit into mating portions of the cylinder cover 12 and the injecting bridge 25. hiquid under pressure is supplied to the rear cylinder chamber 29 of each injecting cylinder E when it is desired to retract the feed screw. The cylinder chamber 29 is defined by the steel barrel 11 and by the injecting bridge 25, which serves as a cylinder cover. The steel barrel 18 h as adjacent to the injecting bridge 25 an end por-tion 18a which is larger in diameter than the remaining portion of the steel barrel 18 so that the cylinder eh amber 29 is smaller in cross-section than the cylinder eh amber 28 and the feed screw can be retracted at a velocity which is higher than the velocity at which it is advanced for injecting under the same boundary conditions.
The hydraulic control system is disposed below the injecting bridge 25 so that only short lines for the hydraulic liquid are required between the hydraulic valves 27 and the cylinder chambers.
The liquid supply lines are symmetrical with respect r V
to the injection axis s-s and are rigid and have identical cross-sections sa that the stresses will be uniform and the movements will be as symmetrical as possible. Each supply line comprises an annular passage 33a or 37a, which has a, port 33b or 37b for supplying hydraulic liquid to an associated cylinder chamber. Each annular passage 37a is formed in th a injecting bridge 25 and its port 37b merges at the bottom of the centering recess 25a into the associated cylinder chamber 29. Liquid under pressure is supplied to each cylinder chamber 28 through a supply line 33 and an annular passage 33a, which communicates with the cylinder ch amber 28 through a port 33b. The annular passage 33a and the ports 33b are formed in the cylinder cover 12. It is also apparent from Figure 4 that a section of the supply line 33 is disposed between the injecting bridge arid the cylinder cover and will be clamped in position as the clamp screws 23 are tightened.
To assemble the injecting unit, the steel barrels 11 axe fitted over the steel barrels 18 arid the sets of steel barrels 11, 18 are secured to the injecting bridge 25 by means of the clamp screws 23.
The piston rod guides 31 are secured to the injecting bridge 25 by the screws 32. The cylinder barrel 18 is provided at its rear end with the cylinder cover 14 and the sub-unit which has now been assembled is ~~~~4a~) ~'~
pushed onto the guide rods 19 and the advance-retract pistons 22 provided thereon and is also pushed through the bore 10b of the carrier block 10. Thereafter an adjusting nut 30 is screwed onto screw threads on the end portion 18c of each cylinder barrel 18 so th at the sub-unit is engaged with the carrier block 10. The cylinder chamber 15 is then closed by the insertion of the cylinder cover 13 and the cover 13 is secured to the carrier block 10 by the screws 21. When the hydraulic lines have been connected to the hydraulic control system of the injection molding machine, liquid under pressure can be supplied to the rotary motor 26 through supply lines 26a, 26b.
It must be possible to transport the entire injecting unit as such. For that purpose the unit is provided with a carrier 20 for supporting the injecting unit at its forward end. The movements of the advance-retract and injecting cylinders are measured by linear potentiometers 36.
_ 15 _
1. Field of the Invention This invention relates to an injection molding machine for processing synthetic resins and other plastic materials, comprising in an injecting unit a plasticizing cylinder, which is mounted in a carrier block, th at is axially coupled to at least two hydraulic advance-retract cylinders, which are symmetrically disposed with respect to the injection axis and serve to axially displace the injecting unit on stationary guide rods, on which advance-retract pistons are fixedly mounted, and at least two injecting cylinders, which are supported by and axially movable relative to the carrier block and are symmetrically disposed with respect to the injection axis and serve to axially drive a rotatable feed screw, which is pro~,rided in the plasticizing cylinder. Each of the advance-retract cylinders is coaxially surrounded by one of said injecting cylinders and carries an injecting piston for cooperating with said injecting cylinder.
Description of the Prior Art German Utility :yodel 70 46 62~ discloses an injecting unit of that kind, in which each actuating cylinder and the associated injecting cylinder are hydraulically connected in series in such a manner th at the two associated cylinders constitute a unit but are separately supplied with liquid under pressure.
_ 2 -The cylinders of each pair are nested one in the other and the injecting cylinder is mounted on the advance-retract cylinder in such a manner that the actuating cylinder carries the injecting piston cooperating with the associated injecting cylinder; th at injecting piston is secured in recesses of the advance-retract cylinder.
The advance-retract cylinder is indirectly secured to the carrier block and cannot be removed unless screws have been loosened and the advance-retract cylinder has been displaced to release an axial lock. For this reason a quick exchange of the advance-retract cylinders is prevented by the means by which they are fixed. The injecting cylinders are constituted by a casting, which also constitutes an injecting bridge.
U.S. Patent 4,668,178 discloses another injecting unit of that kind, in which the advance-retract cylinder barrels consist of non-cast steel barrels, which at one end are supported in corresponding annular shoulders of the carrier block. The associated sleevelike cylinder covers tightly enclose the guide rods and extend almost throughout the axial length of the bores of the carrier block and fit said bores without a play. For this reason the advance-retract cylinders cannot be operated until the injecting unit h as completely been mounted.
U.S. Patent 4,850,841 discloses another injecting unit, in which each advance-retract cylinder ~~~z~9 ~r~
and the associated injecting cylinder are separate from each other and separately mounted in the carrier block.
In that case the cylinders screw-connected to the carrier block can easily be replaced and their operativeness can be tested before they are installed. But the carrier block casting must be sufficiently large for accommo-dating a,11 cylinders. An increase of the size of the casting will give rise to increasingly stringent problems which are due to the formation of pipes during the casting process. Besides, such a carrying block will render an injection into the parting line of the mold more difficult in an upright injecting unit.
Finally, it is known from U.S. Patent 5,129,816 that the coaxial arrangement of th a cylinders can be improved in that they are adjustably mounted on the carrier block by means of a plurality of screws, which are parallel to the injection axis and arranged approx-imately on a circular line.
SUMMARY OF THE INVENT ION
In view of the x~rior art discussed hereinbefore it is an object of the invention to provide an injecting molding machine which is of the kind described first hereinbefore and in which the injecting unit meets the increasing requirements, particularly as regards the transmission of strong forces, whereas the requirements for an economical series manufacture are also met.
That object is accomplished in accordance with the inventien in that each advance-retract cylinder barrel is integrally formed with a radial flange, which constitutes an injecting piston for cooperating with an associated injecting cylinder.
Each advance-retract cylinder barrel is formed during its manufacture with the injecting piston for cooperation with an associated injecting cylinder.
Because that injecting piston is integral with the cylinder barrel it can take up even high pressures without an arising of problems and without a risk of leakage. Machining can be effected in a simple manner because any dimensional tolerances, particularly of the outside surfaces of the cylinder barrel, are less significant than, e.g., dimensional tolerances of the recesses provided in the prior art for receiving the injecting piston. Besides, the much lower structural expenditure and space requirement of the means f or fixing the cylinder barrels and the much smaller space required for such means permit an injection through an axial sprue and into the parting line.
According to a preferred feature each advance-retract cylinder barrel and the associated injecting cylinder barrel constitute a unit, which is adapted to be fixed in the carrier block by a cylinder cover provided on the advance-retract cylinder barrel and consist of respective non-cast steel barrels. In that ~~a~a ~
case the unit comprising the two nested cylinders pref-erably includes also the injecting bridge and can be fitted into the bores of the carrier block with a relatively small amount of work. Besides, it is possible before the assembling to test the operativeness of each advance-retract cylinder and the associated injecting cylinder because in that case it will be sufficient to close the advance-retract cylinder with the cylinder cover. In the premises of the user it will then be possible in case of a shutdown to effect a replacement even by moderately skilled staff because it is again sufficient to remove only the forward cylinder cover in order to detach the advance-retract cylinders from the carrier block. The cyl nder barrels consist of non-cast steel because it h as been found in practice that the use of castings will give rise to difficulties particularly under high pressures as pipes are formed during the casting operation and, by experience, rendex almost 25% of the castings inoperative. The use of non-cast steel barrels will also facilitate the manu-facture of the advance-retract cylinder barrel which is integrally formed with an injecting piston because that piston can simply be formed out of the wall of the cylinder.
According to a preferred feature the cylinder cover of each advance-retract cylinder is fixed to the carrier block by a plurality of fixing screws, which are - 6 _ ~~~~~ i'~
parallel to the injection axis and arranged approximately on a circular line. In that case each advance-retract cylinder barrel is larger in diameter adjacent to the injecting bridge so that the cylinder space available for retracting the feed screw is decreased. This affords the advantage that the feed screw can be retracted at a higher speed which is higher than the speed of the advancing movement which is imp arted to the feed screw during the injecting operation and is effected by the fluid in the other space of the cylinder.
Besides, the use of cylinder spaces which differ in size i.s an essential requirement for the control of the movements, particularly if the holding pressure is to be controlled.
According to a preferred feature each cylinder chamber of each injecting cylinder is supplied with liquid under pressure through a supply passage and a succeeding annular passage, which is provided adjacent to the associated cylinder cover and terminates in an outlet, and hydraulic valves are provided adjacent to the injecting bridge and are connected to said cylinder chambers by rigid lines, which have identical cross-sections and are symmetrically arranged with respect to the injection axis. Owing to the supply of the liquid under pressure through an annular passage the hydraulic liquid flows uniformly into said cylinder chambers. If the outlet is provided at the top end of _ 7 _ the annular passage, it will be possible to effectively suppress undesired accompanying phenomena, such as an occurrence of air bubbles. An exact control of the pressure in associated cylinder chambers can be effected because rigid lines rather than elastic lines are provided so that the pressure in the cylinder chambers will not be influenced by an elasticity of the material of the lines. The symmetrical arrangement of all lines and their identical cross-sections also will contribute to an avoiding of problems in the control or automatic control of pressure.
BRIEF DESCRIPTTON OF THE DRAWING
Figure 1 is a top plan view showing an injecting unit.
Figure 2 is a side elevation showing the injecting unit of Figure 1.
Figure 3 is a horizontal sectional view taken on a plane on the level of the guide rods and showing the injecting unit on a larger scale.
Figure 4 is a vertical sectional view showing a guide rod of Figure 3.
Figures 5, 6, 7 are sectional views showing the injecting unit of Figure 1 and taken on lines V-V, VI-VI, and VII-VII, respectively, in Figure 1.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIT~IENT
An illustrative embodiment of the invention will now be described with reference to the drawings, _ g _ (~ C~ F rv r and further advantages afforded by the invention ~~1~' ~ ~ ~
become apparent from said description.
The illustrated injecting unit comprises a carrier blocx 10, in which a plasticizing cylinder 17 is mounted by means of a nut 34. The plasticizing cylinder 17 is a component of a plasticizing sub-unit, which is provided with heating means. The plasticizing cylinder 17 has a longitudinal center line and is so mounted in the carrier block 10 that said longitudinal center line constitutes an injection axis s-s. The carrier block 10 h as two wing portions 10a, which are formed with respective bores 10b, which axe sym-metrical to the injection axis s-s and contain respective hydraulic advance-retract cylinders A for axially displacing the injecting unit on guide rods 19 of the injection molding machine. Said guide rods 19 are provided with fixed annular advance-retract pis-tons 32, which are axially slidably sealed in the advance-retract cylinders. The guide rods 19 are axially fixed to a stationary mold carrier of the injection molding machine, which is intended to process synthetic resins or other plastic materials, such as ceramic compositions. Each advance-retract cylinder A
comprises two cylinder covers 13, 14, a barrel 18, which is made of non-cast steel, and an advance-retract piston 22, which is provided on a guide rod 19.
Two hydraulic injection cylinders E are t provided, which are also symmetrical with respect to the injection axis s-s and serve for axially displacing a feed screw 35, which is contained in the plasticizing cylinder 17. The cylinder barrel 18 of each advance-retract cylinder A carries an injecting piston 18b, which is axially slidably sealed in the cylinder barrel 11 of an associated injecting cylinder E.
The steel barrel 11 of each injecting cylinder E
coaxially surrounds and is radially spaced from the steel barrel 18 of an associated advance-retract cylinder A. More than two sets of advance-retract and injecting cylinders may be provided around the injection axis s-s.
The injecting piston for cooperating with each injection cylinder consists of a radial flange 18b, which is provided on the cylinder barrel 18 of the associated advance-.retract cylinder and is integrally formed with the barrel 18 that is made of non-cast steel; but a different arrangement is also possible.
As is apparent from Figure 2 the advance-retract cylinders A are freely carried by the carrier block 10 in such a manner that two-thirds of the length of the advance-retract cylinders A protrude rearwardly out of the wings 10a. On the other hand, the injecting cylinders project rearwardly out of the advance-retract cylinders and are fixed in an injecting bridge 25, which carries a motor 26 for rotating the feed screw and comprises a bearing block, in which means are movably mounted which serve to transmit torque from the drive motor 26 to the feed screw 35.
The advance-retract cylinders A, the injecting cylinders E, and the injecting bridge 25 constitute a sub-unit, which is anchored in the carrier block 10.
For that purpose a cylinder cover 13 of each advance-retract cylinder A is fixed to the carrier block by a plurality of fixing screws 21, which are approximately parallel and are approximately arranged on a circular line. Said fixing screv~is are screwed into an adjusting nut 30, which is screwed on the forward end portion 18e of the steel barrel 18 of an associated advance-retract cylinder A and constitutes the means with which the sub-unit A, E, 25 engages the carrier block 10. Each guide rod 19 is provided with a radial ring 19c, to which an annul ar piston 22 is ffixed. Each guide rod 19 is formed with two axial bores, which constitute passages 19a, 19b for supplying liquid under pressure to the cylinder chambers 15 and 16 contained in each advance-retract cylinder A on both sides of the annular piston 22. The cylinder chambers 15, 16 are defined by the guide rod 19, which serves as a piston rod, by the annular piston 19, and by the steel barrel 18. The cylinder chamber 16 is axially defined by the piston 22 and the cylinder cover 14, which has been screwed into internal screw threads 18d formed in the adjacent end ~~~;~'~ ~~~
portion of the steel barrel 18. The cylinder chamber 16 is supplied with liquid under pressure when it is desired to retract the injecting unit from the mold plate. The other cylinder ch amber 15 of each advance--retract cylinder is disposed in front of the cylinder chamber 16 and serves to advance the injecting unit toward the mold plate. The cylinder chamber 15 is axially defined by the annular piston 22 and the cylinder cover 13, which may be mounted on the cylinder barrel 18 before the final assembly so that the cylinder can be tested for op-erativeness. liquid under pressure can be supplied to the annular piston 22 from both sides.
Each steel barrel 18 is integral with an injecting piston for cooperating with an associated injecting cylinder E and constitutes also a piston rod for the associated injecting cylinder E. Each steel barrel 18 is axially movably mounted in an annular piston rod guide 31, which is secured in a recess 25b of the injecting bridge 25. A plurality of screws 32 extend through the piston rod guide 31 and are screwed into the injecting bridge 25. The radial flange 18b provided on the steel barrel 18 axially defines two cylinder chambers 28, 29, which are supplied with liquid under pressure on either side of the flange 18b in order to axially move the feed screw 35. By a supply of liquid under pressure to the cylinder ch amber 28 the feed screw 35 is moved ~~~a~z~ ~~~
toward the mold plate. The cylinder chamber 28 is axially defined also by the cylinder cover 12, which is connected to the injecting bridge 25 by clamp screws 23 (Fig-ures 1, 2). >i'or that purpose the steel barrels 11 are also held in centering recesses 25a formed in the injecting bridge 25. The cylinder barrels 11 comprise end portions 11a, which are smaller in diameter and fit into mating portions of the cylinder cover 12 and the injecting bridge 25. hiquid under pressure is supplied to the rear cylinder chamber 29 of each injecting cylinder E when it is desired to retract the feed screw. The cylinder chamber 29 is defined by the steel barrel 11 and by the injecting bridge 25, which serves as a cylinder cover. The steel barrel 18 h as adjacent to the injecting bridge 25 an end por-tion 18a which is larger in diameter than the remaining portion of the steel barrel 18 so that the cylinder eh amber 29 is smaller in cross-section than the cylinder eh amber 28 and the feed screw can be retracted at a velocity which is higher than the velocity at which it is advanced for injecting under the same boundary conditions.
The hydraulic control system is disposed below the injecting bridge 25 so that only short lines for the hydraulic liquid are required between the hydraulic valves 27 and the cylinder chambers.
The liquid supply lines are symmetrical with respect r V
to the injection axis s-s and are rigid and have identical cross-sections sa that the stresses will be uniform and the movements will be as symmetrical as possible. Each supply line comprises an annular passage 33a or 37a, which has a, port 33b or 37b for supplying hydraulic liquid to an associated cylinder chamber. Each annular passage 37a is formed in th a injecting bridge 25 and its port 37b merges at the bottom of the centering recess 25a into the associated cylinder chamber 29. Liquid under pressure is supplied to each cylinder chamber 28 through a supply line 33 and an annular passage 33a, which communicates with the cylinder ch amber 28 through a port 33b. The annular passage 33a and the ports 33b are formed in the cylinder cover 12. It is also apparent from Figure 4 that a section of the supply line 33 is disposed between the injecting bridge arid the cylinder cover and will be clamped in position as the clamp screws 23 are tightened.
To assemble the injecting unit, the steel barrels 11 axe fitted over the steel barrels 18 arid the sets of steel barrels 11, 18 are secured to the injecting bridge 25 by means of the clamp screws 23.
The piston rod guides 31 are secured to the injecting bridge 25 by the screws 32. The cylinder barrel 18 is provided at its rear end with the cylinder cover 14 and the sub-unit which has now been assembled is ~~~~4a~) ~'~
pushed onto the guide rods 19 and the advance-retract pistons 22 provided thereon and is also pushed through the bore 10b of the carrier block 10. Thereafter an adjusting nut 30 is screwed onto screw threads on the end portion 18c of each cylinder barrel 18 so th at the sub-unit is engaged with the carrier block 10. The cylinder chamber 15 is then closed by the insertion of the cylinder cover 13 and the cover 13 is secured to the carrier block 10 by the screws 21. When the hydraulic lines have been connected to the hydraulic control system of the injection molding machine, liquid under pressure can be supplied to the rotary motor 26 through supply lines 26a, 26b.
It must be possible to transport the entire injecting unit as such. For that purpose the unit is provided with a carrier 20 for supporting the injecting unit at its forward end. The movements of the advance-retract and injecting cylinders are measured by linear potentiometers 36.
_ 15 _
Claims (18)
1. In an injection molding machine for processing plastic materials, comprising an injecting unit comprising a carrier block, a plasticizing cylinder having a longitudinal center line and mounted in said carrier block so that said longitudinal center line defines an injecting axis, a feed screw mounted in said plasticizing cylinder and operable to rotate about said injection axis and axially movable along said injection axis relative to said carrier block, at least two advance-retract cylinder barrels axially coupled to said carrier block and symmetrically arranged with respect to said injection axis, a plurality of injecting cylinder barrels, which are axially movably mounted in said carrier block and axially coupled to said feed screw and each of which coaxially surrounds and is radially spaced from an associated one of said advance-retract cylinder barrels, and a plurality of injecting pistons, each of which is carried by and radially protrudes from one of said advance-retract cylinder barrels and is axially slidably sealed in the associated one of said injecting cylinder barrels, said injection molding machine also comprising a plurality of stationary guide rods, which axially slidably extend through said carrier block and respective ones of said advance-retract cylinders and each of which carries a radially outwardly protruding advance-retract piston, which is fixed to said guide rod and axially slidably sealed in one of said advance-retract cylinder barrels, the improvement residing in that each of said injecting pistons consists of a radial flange, which is integral with one of said advance-retract cylinder barrels.
2. The injection moulding machine set forth in claim 1, wherein each of said advance-retract cylinder barrels is axially fixed at one end to a cylinder cover, which is secured to said carrier block.
3. The injection moulding machine set forth in claim 2, wherein said cylinder cover is axially fixed to said carrier block by a plurality of fixing screws, which are substantially parallel to said injection axis and substantially arranged on a circular line.
4. The injection moulding machine set forth in claim 3, wherein an adjusting nut is connected by screw threads to each of said advance-retract cylinder barrels and engages said carrier block, and said fixing screws for axially fixing each of said cylinder covers extend through said adjusting nut connected to the associated advance-retract cylinder.
5. The injection moulding machine set forth in claim 1, wherein said advance-retract cylinder barrels and said injecting cylinder barrels are made of non-cast steel.
6. The injection moulding machine set forth in claim 1, wherein each of said injecting cylinders and the associated advance-retract cylinder are included in a unit, which is detachably connected to said cylinder block.
7. The injection moulding machine set forth in claim 1, wherein a radial ring is fixed to each of said guide rods and each of said advance-retract pistons consists of an annular piston secured to one of said radial rings.
8. The injection moulding machine set forth in claim 1, wherein each of said advance-retract pistons defines in the associated advance-retract cylinder barrel first and second cylinder chambers and each of said guide rods contains two substantially parallel supply passages communicating with respective ones of said cylinder chambers of the associated advance-retract cylinder barrel.
9. The injection moulding machine set forth in claim 1, wherein said plasticizing cylinder contains a motor, which is centered on said injecting axis and axially coupled to and operable to rotate said feed screw about said injection axis, said motor is carried by an injecting bridge, which is axially coupled to all said injecting cylinder barrels and is axially spaced from said carrier block and on its side that faces away from said carrier block is formed with a plurality of recesses, a piston rod guide is secured to said injecting bridge in each of said recesses, each of said guide rods axially extends through one of said piston rod guides, and each of said advance-retract cylinder barrels extends through and is axially slidably mounted in one of said piston rod guides.
10. The injection moulding machine set forth in claim 9, wherein each of said piston rod guides is secured to said injecting bridge by a plurality of fixing screws extending through said piston rod guide.
11. The injection moulding machine set forth in claim 9, wherein each of said injecting cylinder barrels is provided at that end which is nearer to said carrier block with a cylinder cover, and a plurality of clamp screws extend through each of said cylinder covers and are screwed into said injecting bridge and clamp said injecting cylinder barrel axially against said injecting bridge.
12. The injection moulding machine set forth in claim 1, wherein each of said radial flanges defines in the associated injecting cylinder barrel two cylinder chambers, each of said advance-retract cylinder barrels has portions differing in outside diameter on opposite sides of the associated injecting piston and defining the inside surfaces of said cylinder chambers so that said two cylinder chambers have different volumes.
13. The injection moulding machine set forth in claim 1, wherein each of said injecting pistons defines in the associated injecting cylinder barrel two cylinder chambers, one of which is nearer and the other remote from said carrier block, said plasticizing cylinder contains a motor, which is centered on said injecting axis and axially coupled to and operable to rotate said feed screw about said injection axis, said motor is carried by an injecting bridge, which is axially coupled to all said injecting cylinder barrels and is axially spaced from said carrier block and on its side that faces said carrier block is formed with a plurality of centering recesses, each of said injecting cylinder barrels at its end that is remote from said carrier block axially bears on said injecting bridge in one of said centering recesses and each of said cylinder chambers which are remote from said carrier block is defined by said injecting bridge.
14. The injection moulding machine set forth in claim 1, wherein said plasticizing cylinder contains a motor, which is centered on said injecting axis and axially coupled to and operable to rotate said feed screw about said injection axis, said motor is carried by an injecting bridge, which is axially coupled to all said injecting cylinder barrels and is axially spaced from said carrier block, each of said injecting pistons defines in the associated injecting cylinder barrel first and second cylinder chambers, which are nearer to and remote from said carrier block, respectively, first and second hydraulic line systems communicate with said first and second cylinder chambers, respectively, of said injecting cylinder barrels, each of said injecting cylinder barrels is provided with a cylinder cover at that end which is nearer to said carrier block, said first hydraulic line system comprises a plurality of annular passages, each of which is formed in one of said cylinder covers and has a port communicating with the associated first cylinder chamber, said second hydraulic line system comprises a plurality of annular passages, which are formed in said injecting bridge and each of which has a port communicating with one of said second cylinder chambers, and each of said hydraulic line systems comprises a hydraulic valve disposed under said injecting bridge.
15. The injection moulding machine set forth in claim 14, wherein each of said hydraulic line systems comprises between the associated hydraulic valve and the associated annular passages a plurality of rigid branch lines, which are symmetrically arranged with respect to said injecting axis and have equal flow areas.
16. In an injection molding machine for processing plastic materials, comprising an injecting unit comprising a carrier block, a plasticizing cylinder having a longitudinal center line and mounted in said carrier block so that said longitudinal center line defines an injecting axis, a feed screw mounted in said plasticizing cylinder and operable to rotate about said injection axis and axially movable along said injection axis relative to said carrier block, at least two advance-retract cylinder barrels axially coupled to said carrier block and symmetrically arranged with respect to said injection axis, a plurality of injecting cylinder barrels, which are axially movably mounted in said carrier block and axially coupled to said feed screw and each of which coaxially surrounds and is radially spaced from an associated one of said advance-retract cylinder barrels, and a plurality of injecting pistons, each of which is carried by and radially protrudes from one of said advance-retract cylinder barrels and is axially slidably sealed in the associated one of said injecting cylinder barrels, said injection molding machine also comprising a plurality of stationary guide rods, which axially slidably extend through said carrier block and respective ones of said advance-retract cylinders and each of which carries a radially outwardly protruding advance-retract piston, which is (fixed to said guide rod and axially slidably sealed in one of said advance-retract cylinder barrels, the improvement residing in that each of said advance-retract pistons defines in the associated advance-retract cylinder barrel first and second cylinder chambers and each of said guide rods contains two substan-tially parallel supply passages communicating with respective ones of said cylinder chambers of the associated advance-retract cylinder barrel.
17. In an injection molding machine f or processing plastic materials, comprising an injecting unit comprising a carrier block, a plasticizing cylinder having a longitudinal center line and mounted in said carrier block so that said longitudinal center line defines an injecting axis, a feed screw mounted in said plasticizing cylinder and operable to rotate about said injection axis and axially movable along said injection axis relative to said carrier block, at least two advance-retract cylinder barrels axially coupled to said carrier block and symmetrically arranged with respect to said injection axis, a plurality of injecting cylinder barrels, which are axially movably mounted in said carrier block and axially coupled to said feed screw and each of which coaxially surrounds and is radially spaced from an associated one of said advance-retract cylinder barrels, and a plurality of injecting pistons, each of which is carried by and radially protrudes from one of said advance-retract cylinder barrels and is axially slidably sealed in the associated one of said injecting cylinder barrels, said injection molding machine also comprising a plurality of stationary guide rods, which axially slidably extend through said carrier block and respective ones of said advance-retract cylinders and each of which carries a radially outwardly protruding advance-retract piston, which is fixed to said guide rod and axially slidably sealed in one of said advance-retract cylinder barrels, the improvement residing in that said advance-retract cylinder barrels and said injecting cylinder barrels are made of non-cast steel, each of said radial flanges defines in the associated injecting cylinder barrel two cylinder chambers, each of said advance-retract cylinder barrels has portions differing in outside diameter on opposite sides of the associated injecting piston and defining the inside surfaces of s aid cylinder chambers so that said two cylinder chambers have different volumes.
18. In an injection molding machine for processing plastic materials, comprising an injecting unit comprising a carrier block, a plasticizing cylinder having a longitudinal center line and mounted in said carrier block so that said longitudinal center line defines an injecting axis a feed screw mounted in said plasticizing cylinder and operable to rotate about said injection axis and axially movable along said injection axis relative to said carrier block, at least two advance-retract cylinder barrels axially coupled to said carrier block and symmetrically arranged with respect to said injection axis, a plurality of injecting cylinder barrels, which are axially movably mounted in said carrier block and axially coupled to said feed screw and each of which coaxially surrounds and is radially spaced from an associated one of said advance-retract cylinder barrels, and a plurality of injecting pistons, each of which is carried by and radially protrudes from one of said advance-retract cylinder barrels arid is axially slidably sealed in the associated one of said injecting cylinder barrels, said injection molding machine also comprising a plurality of stationary guide rods, which axially slidably extend through said carrier block and respective ones of said advance-retract cylinders and each of which carries a radially outwardly protruding advance-retract piston, which is fixed to said guide rod and axially slidably sealed in one of said advance-retract cylinder barrels, the improvement residing in that each of said injecting pistons defines in the associated injecting cylinder barrel first and second cylinder chambers, which are nearer to and remote from said carrier block, respectively, first and second hydraulic line systems communicate with said first and second cylinder chambers, respectively, of said injecting cylinder barrels, each of said injecting cylinder barrels is provided with a cylinder cover at that end which is nearer to said carrier block, said first hydraulic line system comprises a plurality of annul ax passages, each of which is formed in one of said cylinder covers and has a port communi-cating with the associated first cylinder chamber, said second hydraulic line system comprises a plurality of annular passages, which are formed in said injecting bridge and each of which has a port communi-cating with one of said second cylinder chambers, each of said hydraulic line systems comprises a hydraulic valve disposed under said injecting bridge, and each of said hydraulic line systems comprises between the associated hydraulic valve and the associated annular passages a plurality of rigid branch lines, which are symmetrically arranged with respect to said injecting axis and have equal flow areas.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE4142927A DE4142927C1 (en) | 1991-12-24 | 1991-12-24 | |
| DEP4142927.3 | 1991-12-24 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2082977A1 CA2082977A1 (en) | 1993-06-25 |
| CA2082977C true CA2082977C (en) | 2003-09-09 |
Family
ID=6448100
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002082977A Expired - Fee Related CA2082977C (en) | 1991-12-24 | 1992-11-16 | Injection molding machine |
Country Status (5)
| Country | Link |
|---|---|
| EP (1) | EP0552447B1 (en) |
| JP (1) | JPH0737059B2 (en) |
| AT (1) | ATE136491T1 (en) |
| CA (1) | CA2082977C (en) |
| DE (2) | DE4142927C1 (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4227335C1 (en) * | 1992-08-18 | 1994-03-31 | Karl Hehl | Plastic injection molding machine |
| DE4236282C1 (en) * | 1992-10-28 | 1994-01-27 | Karl Hehl | Screw coupling device on a plastic injection molding machine |
| DE4317998C2 (en) * | 1993-05-29 | 1995-06-14 | Karl Hehl | Injection molding unit for a plastic injection molding machine |
| DE19831482C1 (en) * | 1998-07-14 | 2000-01-20 | Karl Hehl | Electrohydraulic pressure injection molding unit for e.g. plastic, ceramic and powders |
| DE102020112590B3 (en) * | 2020-05-08 | 2021-05-20 | Arburg Gmbh + Co Kg | Injection molding unit for an injection molding machine for processing plastics |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE7046626U (en) * | 1970-12-17 | 1971-03-25 | Stuebbe Maschinenfab Gmbh | Injection unit for injection molding machines |
| JPS57109620A (en) * | 1980-12-26 | 1982-07-08 | Matsushita Electric Ind Co Ltd | Molding apparatus of disk like recording medium |
| DE3447597C1 (en) * | 1984-12-28 | 1986-08-28 | Karl 7298 Loßburg Hehl | Injection molding unit for a plastic injection molding machine |
| DE3735419A1 (en) * | 1987-10-20 | 1989-05-03 | Karl Hehl | PLASTIC INJECTION MOLDING UNIT |
| DE4014311C1 (en) * | 1990-05-04 | 1991-11-14 | Karl 7298 Lossburg De Hehl |
-
1991
- 1991-12-24 DE DE4142927A patent/DE4142927C1/de not_active Expired - Lifetime
-
1992
- 1992-11-16 CA CA002082977A patent/CA2082977C/en not_active Expired - Fee Related
- 1992-12-02 EP EP92120630A patent/EP0552447B1/en not_active Expired - Lifetime
- 1992-12-02 AT AT92120630T patent/ATE136491T1/en not_active IP Right Cessation
- 1992-12-02 DE DE59205965T patent/DE59205965D1/en not_active Expired - Lifetime
- 1992-12-24 JP JP4357257A patent/JPH0737059B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH06134824A (en) | 1994-05-17 |
| EP0552447A1 (en) | 1993-07-28 |
| DE59205965D1 (en) | 1996-05-15 |
| DE4142927C1 (en) | 1993-07-01 |
| JPH0737059B2 (en) | 1995-04-26 |
| CA2082977A1 (en) | 1993-06-25 |
| ATE136491T1 (en) | 1996-04-15 |
| EP0552447B1 (en) | 1996-04-10 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| MKLA | Lapsed |