JP4633501B2 - Injection cylinder load device - Google Patents

Description

  The present invention relates to an injection cylinder load device capable of applying a load equivalent to an actual molding die (molding die) used in injection molding by an injection molding machine to an injection cylinder of the injection molding machine.

Generally, in an injection molding machine, as shown in Patent Document 1 below, an actual molding die used for injection molding has a cavity inside, and an injection sleeve communicates with the cavity. Is connected to the mold, the injection plunger is inserted into the injection sleeve, the injection plunger is connected to the piston rod of the injection cylinder in the injection molding machine, and the piston cylinder is advanced by operating the injection cylinder of the injection molding machine. The injection molding is performed by operating and injecting the molten material (molten metal or molten resin) supplied to the injection sleeve into the cavity.
JP 2004-66253 (paragraph numbers 0008 to 0018, FIG. 1)

  By the way, in the conventional injection molding machine, before the actual injection molding is performed, the waste inside the injection sleeve is set in order to set the injection speed and pressure increase of the piston rod of the injection cylinder without using the actual molten material. The so-called waste strike method in which the injection plunger is moved forward by the piston rod of the injection cylinder in a state where it is packed, and the so-called waste strike method (the same method is performed in a state in which the waste sleeve is not filled in the injection sleeve) ) Etc. are adjusted by the operator repeatedly based on the experience.

  However, in the above adjustment method, in actual injection molding, the back pressure (load) based on the squeezing resistance generated when the actual molten material passes through the gate disposed in the passage from the injection sleeve to the cavity is the piston of the injection cylinder. Not given to the rod. For this reason, in the adjustment method described above, it is impossible to set the injection speed and pressure increase of the piston rod of the injection cylinder in a state where the back pressure based on the throttle resistance by the gate is applied to the piston rod of the injection cylinder. In actual injection molding, it is difficult to operate an injection cylinder of an injection molding machine with predetermined specifications (for example, a predetermined injection speed and a predetermined pressure increase).

  The object of the present invention is to set the injection speed and pressure increase of the piston rod of the injection cylinder without using the actual molten material before the actual injection molding, and arrange it in the passage from the injection sleeve to the cavity. To provide a load device for an injection cylinder in which a back pressure (load) substantially equal to a back pressure based on a throttle resistance generated when an actual molten material passes through a gate to be applied is applied to a piston rod of the injection cylinder. It is in.

In this injection cylinder load device, a plunger connected to a piston rod of an injection cylinder in an injection molding machine is inserted into an insertion hole of the main body so as to be slidable in the axial direction, and a working chamber is formed inside the main body. The working chamber is filled with a liquid in place of an injection molding molten material that can be applied to the injection cylinder of the injection molding machine with a load equivalent to that of an actual mold used for injection molding by the injection molding machine. The main body is defined by partitioning the piston into a working hole provided in the main body so as to be able to contain the liquid and communicate with the working chamber through a communication passage. A feature is that a working chamber is provided, a throttle member having a throttle hole is provided in the communication path, and an opening area of the throttle hole can be changed.

  According to the load device for an injection cylinder according to the present invention, when the piston rod of the injection cylinder in the injection molding machine is connected to the plunger and the injection cylinder of the injection molding machine is operated, the piston rod is operated along with the forward operation of the piston rod. The plunger is advanced to reduce the chamber volume. At this time, the liquid in the working chamber is introduced into the working chamber through the communication path, and passes through the throttle hole of the throttle member provided in the communication path.

  For this reason, by appropriately setting the viscosity of the liquid sealed in the working chamber and the opening area of the throttle hole in the throttle member, the load equivalent to the actual mold used for injection molding by the injection molding machine (ie, injection It is possible to apply to the injection cylinder of the injection molding machine a back pressure substantially equal to the back pressure based on the drawing resistance generated when the actual molten material passes through the gate disposed in the passage from the sleeve to the cavity.

  Therefore, the piston rod of the injection cylinder in the injection molding machine is connected to the plunger of the load device for the injection cylinder according to the present invention, and the injection cylinder of the injection molding machine is operated at a predetermined specification (for example, a predetermined injection speed). With this setting, when the injection molding machine is applied to an actual mold and actually used, the injection is performed with the same specifications as those set using the load device for an injection cylinder according to the present invention. It is possible to operate the injection cylinder of the molding machine.

In carrying out the present invention, and can be replaced with another aperture member opening area different hole aperture of the diaphragm member, it is possible to change configured to be able to open area of the throttle hole. In this case, it is possible to easily and optimally cope with various actual molds by selecting and using a diaphragm member having an appropriate opening area from various diaphragm members having different opening areas. Further, the aperture area of the aperture hole can be adjusted from the outside of the main body (as a variable aperture configuration), and the aperture area of the aperture hole can be changed. In this case, since the aperture area of the aperture hole can be adjusted from the outside of the main body, it is possible to easily change the aperture area of the aperture hole as compared with the replacement of the aperture member described above. .

Also, the hand in the practice of the present invention, before Symbol piston can be abutted by an axial sliding between the contact portion provided on the main body is set to stop. In this case, the volume increase of the working chamber until the piston comes into contact with the abutting portion of the main body and the sliding in the axial direction is stopped is determined by the actual mold used for injection molding by the injection molding machine. By setting it equal to the volume of the cavity, it is possible to verify the operation when actually performing injection molding by an injection molding machine using an actual molding die.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 shows an injection cylinder load device according to the present invention. The injection cylinder load device includes a main body 10 attached to a base (not shown), a plunger 21, a piston 22 and an orifice assembled to the main body 10. A plate 23 and a position detection sensor 24 that is assembled to the main body 10 and detects the position of the plunger 21 are provided.

  The main body 10 includes a cylinder block 11, a horizontal cylinder tube 12, and a horizontal cylinder head 13, and a vertical cylinder tube 14 and a vertical cylinder head 15. The cylinder block 11 is formed so that the horizontal hole 11a and the vertical hole 11b communicate with each other, a sensor mounting hole 11c is formed coaxially with the horizontal hole 11a, and a liquid supply port 11d is formed so as to communicate with the upper part of the vertical hole 11b. Is formed. A plug 16 is detachably attached to the liquid supply port 11d.

  The horizontal cylinder tube 12 is disposed so that its axis substantially coincides with the axis of the horizontal hole 11 a of the cylinder block 11, and is liquid-tightly and integrally assembled to the cylinder block 11 at its base end. An air opening 12a is formed on the side of the tip. The horizontal cylinder head 13 has a support hole 13a through which the rod portion 21b of the plunger 21 passes. The horizontal cylinder head 13 is integrally assembled with the distal end portion of the horizontal cylinder tube 12, and the rod of the plunger 21 is inserted into the support hole 13a. A metal bearing 17 that slidably supports the portion 21b is assembled integrally.

  The vertical cylinder tube 14 is disposed so that the axis thereof is substantially coincident with the axis of the vertical hole 11b of the cylinder block 11, and is liquid-tightly and integrally assembled to the cylinder block 11 at its base end. ing. The vertical cylinder head 15 has a support hole 15a through which the rod portion 22b of the piston 22 passes. The vertical cylinder head 15 is integrally assembled with the distal end portion of the vertical cylinder tube 14, and the rod of the piston 22 is inserted into the support hole 15a. A metal bearing 18 that slidably supports the portion 22b is assembled integrally. The vertical cylinder head 15 has an air opening 15b.

  The plunger 21 has a large-diameter head portion 21 a and a small-diameter rod portion 21 b, and the head portion 21 a is inserted into the fitting insertion hole of the main body 10, that is, the inner hole 12 b of the horizontal cylinder tube 12 via the seal ring 31. The working chamber R1 and the air chamber R2 (always communicating with the atmosphere through the atmosphere opening port 12a) are formed in the main body 10 so as to be slidable in the direction. The plunger 21 is configured to be connected to a piston rod 51 of an injection cylinder in an injection molding machine via a joint 41 at the tip of the rod portion 21b.

  The piston 22 has a large-diameter head portion 22a and a small-diameter rod portion 22b, and the head portion 22a is axially connected to the working hole of the main body 10, that is, the inner hole 14a of the vertical cylinder tube 14 via the seal ring 32. A working chamber R3 and an air chamber R4 (always communicating with the atmosphere through the atmosphere opening port 15b) are defined in the main body 10 so as to be slidable. Further, the piston 22 is set so that the sliding in the axial direction is stopped by contact with the inner end convex portion (contact portion) 15 c of the vertical cylinder head 15.

  The orifice plate 23 is a throttle member having a throttle hole 23a, and is provided in a communication path Po that allows the working chamber R1 and the working chamber R3 to communicate with each other. Further, the orifice plate 23 is detachably assembled to the cylinder block 11 with the vertical cylinder tube 14 removed from the cylinder block 11, and is replaced with another orifice plate 23 having a different opening area of the throttle hole 23a. It is possible. At the time of replacement, the vertical cylinder tube 14, the vertical cylinder head 15, the piston 22 and the like can be replaced with ones having different sizes.

  The working chamber R1 and the working chamber R3 communicate with each other through the throttle hole 23a of the orifice plate 23, and a liquid (working fluid) that replaces an injection-molded molten material (molten metal or molten resin) is supplied into each chamber. It is injected and sealed through the mouth 11d. The working chamber R3 can accommodate a part of the liquid sealed in the working chamber R1 through the throttle hole 23a of the orifice plate 23, and has a maximum volume (the piston 22 is in contact with the inner end convex portion 15c of the vertical cylinder head 15). The volume when stopped is substantially equal to the volume of the cavity of the actual mold used for injection molding by the injection molding machine.

  In the injection cylinder load device of the present embodiment configured as described above, the joint 41 is connected to the plunger 21 in the retracted position as shown in FIG. 1 and the piston rod 51 in the retracted position of the injection cylinder in the injection molding machine. When the injection cylinder of the injection molding machine is moved forward, the plunger 21 is moved forward to reduce the volume of the working chamber R1 as the piston rod 51 moves forward. At this time, the liquid in the working chamber R1 is introduced into the working chamber R3 through the communication path Po and passes through the throttle hole 23a of the orifice plate 23 provided in the communication path Po.

  For this reason, by appropriately selecting the viscosity of the liquid sealed in the working chamber R1 and the opening area of the throttle hole 23a of the orifice plate 23, a load equivalent to an actual mold used for injection molding by an injection molding machine ( That is, it is possible to apply to the injection cylinder of the injection molding machine a back pressure substantially equal to the back pressure based on the drawing resistance generated when the actual molten material passes through the gate arranged in the passage from the injection sleeve to the cavity. It is.

  Therefore, in the present embodiment, the piston rod 51 of the injection cylinder in the injection molding machine is connected to the plunger 21 of the injection cylinder load device so that the injection cylinder of the injection molding machine has predetermined specifications (for example, predetermined injection). If the injection molding machine is applied to an actual mold and actually used, it is equivalent to that set using the injection cylinder load device of this embodiment. It is possible to operate the injection cylinder of the injection molding machine according to the specifications. The injection speed of the injection cylinder, that is, the forward speed of the plunger 21 can be calculated based on a signal from the position detection sensor 24 that detects the position of the plunger 21.

  Further, in the present embodiment, since the orifice plate 23 can be replaced with another orifice plate 23 having a different opening area of the throttle hole 23a, an appropriate opening area can be obtained from various orifice plates 23 having different opening areas of the throttle hole 23a. By selecting and using the orifice plate 23 having the throttle hole 23a, it is possible to easily and optimally cope with various actual molds.

  Further, in this embodiment, the working chamber R3 is defined by inserting the piston 22 into the working hole provided in the main body 10 (the inner hole 14a of the vertical cylinder tube 14) so as to be slidable in the axial direction. As shown in FIG. 2, when the plunger 21 reaches the forward movement position, the piston 22 moves in the axial direction by contact with the inner end convex portion 15 c of the vertical cylinder head 15 (contact portion provided on the main body 10). The sliding is set to stop, and the maximum volume (the volume when the piston 22 stops in contact with the inner end convex portion 15c of the vertical cylinder head 15) is used in the injection molding by the injection molding machine. The volume of the actual mold cavity is approximately equal. For this reason, it is possible to verify the operation when actually performing injection molding by an injection molding machine using an actual molding die.

  In the above embodiment, the working chamber R3 is defined by inserting the piston 22 into the working hole provided in the main body 10 so as to be slidable in the axial direction, and the piston 22 is convex on the inner end of the vertical cylinder head 15. Although the sliding in the axial direction is stopped by contact with the portion 15c (the contact portion provided on the main body 10), the piston 22 and the inner end convex portion 15c may be omitted. .

  In the above embodiment, the orifice plate 23 is replaced with another orifice plate 23 having a different opening area of the restricting hole 23a. However, the opening area of the restricting hole of the orifice plate can be adjusted from the outside of the main body. It is also possible to implement (as a variable aperture configuration).

1 shows an embodiment of a loading device for an injection cylinder according to the present invention, and is a cross-sectional view showing a state where a plunger is in a retracted position. It is sectional drawing of the state which the plunger moved to the advance position in embodiment shown in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Main body, 11 ... Cylinder block, 12 ... Horizontal cylinder tube, 12b ... Inner hole (insertion hole), 13 ... Horizontal cylinder head, 14 ... Vertical cylinder tube, 14a ... Inner hole (working hole), 15 ... Vertical Cylinder head, 15c ... inner end convex part (contact part), 21 ... plunger, 22 ... piston, 23 ... orifice plate, 23a ... throttle hole, 41 ... joint, 51 ... piston rod of injection cylinder, R1 ... working chamber, R3 ... working chamber, Po ... communication path

Claims (4)

The plunger connected to the piston rod of the injection cylinder in an injection molding machine fitted slidably in the axial direction on insertion hole fitting the body, a working chamber inside the body and compartment forming, injection in the same working chamber A liquid in place of a molten material for injection molding that can be applied to an injection cylinder of an injection molding machine with a load equivalent to an actual mold used for injection molding by a molding machine is provided, An operation chamber is provided which is communicated with the working chamber through a communication passage, can contain the liquid, and is partitioned by inserting a piston in an axially slidable manner in the operation hole. The injection cylinder load device is characterized in that a throttle member having a throttle hole is provided in the cylinder so that the opening area of the throttle hole can be changed.   2. The injection cylinder load device according to claim 1, wherein the throttle member can be replaced with another throttle member having a different aperture area, and the aperture area of the throttle hole can be changed. Loading device for injection cylinder.   The injection device for an injection cylinder according to claim 1, wherein the opening area of the throttle hole is adjustable from the outside of the main body, and the opening area of the throttle hole is changeable. Cylinder load device.   The injection cylinder load device according to any one of claims 1 to 3, wherein the piston is set so that sliding in an axial direction is stopped by contact with a contact portion provided on the main body. A loading device for an injection cylinder.

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