JP2006069219A - Production status indication device of molding machine - Google Patents

Production status indication device of molding machine Download PDF

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Publication number
JP2006069219A
JP2006069219A JP2005302710A JP2005302710A JP2006069219A JP 2006069219 A JP2006069219 A JP 2006069219A JP 2005302710 A JP2005302710 A JP 2005302710A JP 2005302710 A JP2005302710 A JP 2005302710A JP 2006069219 A JP2006069219 A JP 2006069219A
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screw
molded
injection
resin
metering
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JP2005302710A
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Japanese (ja)
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Masaaki Konno
政昭 今野
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Sumitomo Heavy Ind Ltd
住友重機械工業株式会社
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Priority to JP2005302710A priority Critical patent/JP2006069219A/en
Publication of JP2006069219A publication Critical patent/JP2006069219A/en
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Abstract

The quality of a molded product can be determined, and a mold apparatus can be prevented from being damaged.
When the metering process is completed, the screw is rotated in the reverse direction to shut off the metering portion and the screw head, the injection member is advanced with a constant force, and the position of the injection member is detected. The difference between the position and the reference position is calculated, it is determined whether or not the difference falls within a predetermined range, and if the difference falls, it is determined to be a non-defective product. Judgment is made to determine the quality of the molded product.
[Selection] Figure 1

Description

  The present invention relates to a quality determination method for a molded product.

Conventionally, in an injection molding machine, a screw is rotatably disposed in a heating cylinder of an injection device and can be moved forward and backward, and the screw can be rotated or moved forward and backward by driving a driving means. It can be done. When the screw is rotated during the metering step, the resin supplied from the hopper into the heating cylinder is heated, melted, advanced, and stored in front of the screw head. Further, during the injection process, the screw is advanced, and the resin stored in front of the screw head is injected from the injection nozzle and filled in the cavity space of the mold apparatus. Subsequently, the molded product can be molded by cooling and solidifying the resin filled in the cavity space.
In this case, since the resin filled in the cavity space shrinks as it cools, a pressure holding step is provided next to the injection step. During the pressure holding step, a pressure is applied to the resin in the cavity space by the screw. As a result, the contracted resin is supplied to the cavity space (see, for example, Patent Document 1).

JP-A-2-175221

  However, in the conventional injection molding machine, the resin stored in front of the screw head in the measuring process, that is, the density of the measuring resin varies. In particular, in order to reduce the cost of the resin, the resin obtained by pulverizing the molded product once formed, that is, the recycled resin is used by mixing it with a resin that has never been used. As a result, the volume of the resin varies, and the density of the metering resin varies greatly.

  Even if the resin of the same material is used, if the production lot of the resin is different, the characteristics of the resin change and the density of the metering resin varies.

  Therefore, the weight of the resin injected from the injection nozzle changes even if the measurement is performed with the same molding conditions and with a constant stroke. As a result, the weight of the resin filled in the cavity space changes, and the molded product The accuracy of will decrease. For example, when the weight of the resin filled in the cavity space is small, molding defects such as short shots occur, and when the weight of the resin filled in the cavity space is large, molding defects such as burrs occur due to overpacking. End up.

  When molding defects such as short shots and flashes occur, the molded product often remains in the cavity space when the mold apparatus is opened, and the mold apparatus is damaged during mold clamping. It may end up.

  Even if the density of the metering resin is stable, if the check ring of the backflow prevention device wears down and the backflow prevention function decreases, the amount of resin injected will be small even if the metering is performed with a constant stroke. And molding defects such as short shots occur.

  Therefore, it is conceivable to determine the quality of the molded product according to the monitoring item of the injection molding machine, for example, the minimum cushion amount, but in the injection molding machine, since measurement is performed with a constant stroke, Even when the weight of the injected resin is different and the weight of the resin filled in the cavity space changes, the minimum cushion amount does not change. Therefore, it cannot be known that a molding defect has occurred, and the quality of the molded product cannot be determined.

  The present invention solves the problems of the conventional injection molding machine, provides a molded product quality determination method that can determine the quality of a molded product and can prevent the mold apparatus from being damaged. The purpose is to do.

  According to the present invention, in the quality determination method for the molded product, when the measuring step is completed, the screw is rotated in the reverse direction to shut off the metering portion and the screw head, and the injection member is advanced with a constant force, and the injection is performed. Detect the position of the member, calculate the difference between the detected position and the reference position, determine whether the difference falls within a predetermined range, and if the difference falls, If not, the product is judged to be defective and the quality of the molded product is judged.

  In this case, when the recycled resin is mixed with a resin that has never been used, or when a resin with a different production lot is used, the density of the metering resin varies, resulting in molding of short shots, flashes, etc. When a defect occurs, it can be determined that the molded product is a defective product.

   Therefore, in the quality determination method of the molded product according to the present invention, (a) the screw is rotated in the measuring step to send the molten resin from the metering portion to the front of the screw head, and (b) the screw is turned on when the measuring step is completed Rotating in the opposite direction to shut off the metering part and the screw head, (c) advancing the injection member with a constant force, detecting the position of the injection member, (d) the detected position and the reference position (E) It is determined whether or not the difference falls within a predetermined range. (F) When the difference is within the range, it is determined to be a non-defective product. It is judged and the quality of a molded product is judged.

  In another quality determination method for a molded product of the present invention, the position is a position of the injection member after the injection member is advanced.

  In still another molded product quality determination method of the present invention, the position is an advance amount of the injection member when the injection member is advanced.

  In still another molded product quality determination method of the present invention, the reference value is an average value of the position of the injection member after the injection member is advanced in a plurality of shots after the good product is molded. is there.

  In still another molded product quality determination method of the present invention, the reference value is an average value of the advancement amount of the injection member when the injection member is advanced in a plurality of shots after the good product is molded. It is.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  1 is a schematic view of an injection device according to an embodiment of the present invention, FIG. 2 is a front view of a backflow prevention device according to an embodiment of the present invention at the time of a metering process, and FIG. 3 is a sectional view taken along line XX in FIG. 4 is a front view at the time of reverse rotation of the backflow prevention device according to the embodiment of the present invention, and FIG. 5 is a YY sectional view of FIG.

  In the figure, 11 is a heating cylinder as a heating member, and the heating cylinder 11 has an injection nozzle 13 at the front end (left end in FIGS. 1, 3 and 5). In the heating cylinder 11, a screw 12 as an injection member is rotatably and reciprocally moved (moved in the left-right direction in FIGS. 1, 3 and 5) and driven by driving means 52. The screw 12 is rotated or moved back and forth. As the driving means 52, an injection cylinder, an electric motor or the like is usually used. The screw 12 extends rearward (to the right in FIGS. 1, 3 and 5) in the heating cylinder 11 and is connected to the driving means 52 at the rear end (right end in FIGS. 1, 3 and 5). Have a screw head 14. A screw-like flight 15 is formed on the surface of the metering portion 18 of the screw 12, and a groove 16 is formed along the flight 15.

  A hopper 17 is disposed at a predetermined position on the rear side of the heating cylinder 11, and a pellet-like resin (not shown) as a molding material is charged into the hopper 17. In addition, 53 is a screw position detector and 54 is a load detector.

  In the injection device having the above-described configuration, when the driving unit 52 is driven and the screw 12 is moved backward in the direction of arrow M in FIG. 3 (moved to the right in FIGS. 1, 3 and 5) during the metering step, The resin in the hopper 17 is supplied into the heating cylinder 11 and moved forward in the groove 16 (moved to the left in FIGS. 1, 3 and 5).

  A heater (not shown) is disposed on the outer periphery of the heating cylinder 11, and the heating cylinder 11 can be heated by the heater to melt the resin in the groove 16. Therefore, when the screw 12 is rotated in the direction of arrow M, one shot of resin is stored in front of the screw head 14 (leftward in FIGS. 1, 3 and 5), and the screw 12 is retracted accordingly.

  In this way, when the metering process is completed, suck back is performed so that the molten resin does not drip from the tip of the injection nozzle 13, and the screw 12 is further retracted by a small amount without being rotated. .

  Next, in the injection process, when the driving means 52 is driven to advance the screw 12 without rotating it, the molten resin stored in front of the screw head 14 is injected from the injection nozzle 13 to form a mold. A cavity space (not shown) of the device 51 is filled.

  By the way, a backflow prevention device is disposed so that the molten resin stored in front of the screw head 14 does not flow back during the injection process.

  That is, the screw head 14 has a conical head body portion 21 at the front portion (left portion in FIGS. 1, 3 and 5) and a small diameter portion 19 at the rear portion (right portion in FIGS. 1, 3 and 5). The rear end of the small diameter portion 19 is screwed to the metering portion 18. An annular check ring 31 is disposed on the outer periphery of the small diameter portion 19.

  The check ring 31 selectively cuts off the front of the screw head 14 and the metering unit 18, and sends the molten resin of the metering unit 18 to the front of the screw head 14 during the metering process, and the screw head 14 during the injection process. This prevents the molten resin in front of the backflow of the metering portion 18.

  For this purpose, axially extending grooves 35 are formed at a plurality of locations in the circumferential direction of the small diameter portion 19, for example, at four locations. Each groove 35 is formed only in the front part (left part in FIG. 3) of the small diameter part 19, and behind each groove 35, the entire outer periphery of the small diameter part 19 is equal to the depth of the groove 35. An annular resin flow path 35 a is formed between the check ring 31 and the small diameter portion 19. Each groove can be extended to the rear end of the small diameter portion 19 as it is.

  In addition, arc-shaped protrusions 36 and 37 are formed in front of the check ring 31 so as to correspond to the grooves 35, and the two arc-shaped protrusions 36 are arranged in the circumferential direction of the head main body 21. It extends in the notch 25 formed in two places. Therefore, the check ring 31 is closed by rotating the check ring 31 relative to the screw head 14 with the rotation of the screw 12 and locking the arc-shaped protrusion 36 and the head main body 21. Can be placed in position and open position. When the check ring 31 is placed in the closed position, the arc-shaped projecting piece 36 and the groove 35 overlap in the circumferential direction, shuts off the front of the screw head 14 and the metering portion 18 and opens the check ring 31. When placed in the position, the arc-shaped protruding piece 36 and the groove 35 do not overlap in the circumferential direction, and the front of the screw head 14 and the metering portion 18 are communicated with each other.

  On the other hand, the two arc-shaped projecting pieces 37 extend to the vicinity of the rear end of the head main body 21, and when the check ring 31 is placed at the closed position, the arc-shaped projecting pieces 37 and the groove 35 overlap in the circumferential direction. When the front of the screw head 14 and the metering portion 18 are blocked and the check ring 31 is placed in the open position, the arc-shaped projecting piece 37 and the groove 35 do not overlap in the circumferential direction, and the front of the screw head 14 The metering unit 18 is communicated. A resin flow path 38 is formed between the arc-shaped projecting pieces 36 and 37.

  When the check ring 31 moves relatively forward with respect to the screw head 14 and the rear end of the head main body 21 and the tip of the arc-shaped projecting piece 37 come into contact with each other, the rear end of the check ring 31 The dimension of the check ring 31 is set so that the resin flow path 40 is formed between the sealing ring 18 a fixed to the front end of the metering portion 18. When the check ring 31 moves rearward relative to the screw head 14 and the rear end of the check ring 31 contacts the front end of the seal ring 18a, the front of the screw head 14 and the meter ring The part 18 is blocked.

  Next, the operation of the backflow prevention device having the above configuration will be described.

  First, when the screw 12 is rotated in the direction of arrow M in FIG. 3 during the metering step, the check ring 31 tends to stop due to inertia and resistance of the molten resin, and as shown in FIG. Hits the arc-shaped protruding piece 36, and thereafter, the screw head 14 and the check ring 31 are rotated together. At this time, the check ring 31 is placed in the open position, and the front of the screw head 14 and the metering unit 18 are communicated with each other.

  In this state, when the screw 12 is moved backward by a predetermined amount while rotating in the direction of the arrow M, the resin in the hopper 17 is supplied into the heating cylinder 11 and is advanced in the groove 16 and is melted by the heater. It is done. Then, the molten resin that has passed through the metering portion 18 reaches the front of the screw head 14 through the resin flow paths 40, 35 a, the groove 35, and the resin flow path 38. In this way, one shot of molten resin is stored in front of the screw head 14.

  Subsequently, before the injection process is performed, when the screw 12 is rotated in the reverse direction, that is, in the direction of the arrow N in FIG. 5, the check ring 31 tries to stop due to inertia and resistance of the molten resin. As shown, the head main body 21 hits the arc-shaped protruding piece 36, and thereafter, the screw head 14 and the check ring 31 are rotated integrally. At this time, the check ring 31 is placed in the closed position and blocks the front of the screw head 14 and the metering portion 18.

  In the injection process, when the screw 12 is advanced to the forward limit position without rotating, the molten resin stored in front of the screw head 14 is injected from the injection nozzle 13, and the cavity space of the mold device 51 is obtained. Filled. At this time, since the front of the screw head 14 and the metering portion 18 are blocked, the molten resin in front of the screw head 14 does not flow backward. Further, as the screw 12 advances, the check ring 31 moves rearward relative to the screw head 14, and the seal is finished when the rear end of the check ring 31 comes into contact with the seal ring 18a. .

  As described above, when the measuring step is completed, the screw 12 is rotated only in the direction of the arrow N so that the front of the screw head 14 and the metering portion 18 can be shut off. Can be prevented.

  By the way, depending on the characteristics of the resin, the type of the molded product, etc., there may be almost no time for applying a holding pressure to the resin in the cavity space. For example, when a resin having a high solidification speed is used, the resin may solidify while flowing in the cavity space. In this case, even if a holding pressure is applied to the solidified resin, This resin cannot be supplied to the cavity space.

  In addition, when molding a molded product with a small thickness, a molded product having a precise and complicated shape, etc., since the size of the mold device 51 is small and the shape of the cavity space is complicated, the resin in the cavity space is kept. When pressure is applied, not only the life of the mold apparatus 51 is shortened, but the mold apparatus 51 may be damaged.

  Therefore, in this embodiment, measurement is performed with a constant stroke without providing a pressure holding process after the injection process is completed. However, in this case, if the density of the measurement resin varies, the weight of the resin injected from the injection nozzle 13 changes even if the measurement is performed with a constant stroke. The weight changes and the accuracy of the molded product decreases.

  Therefore, after the metering process is completed, the front of the screw head 14 and the metering portion 18 are blocked by a backflow prevention device, and the screw 12 is advanced by pressing it with a constant force. As a variable, the position of the screw 12 after the screw 12 is advanced is detected by the screw position detector 53, and the quality of the molded product is determined based on the detected position of the screw 12.

  Next, the control apparatus for the injection molding machine having the above-described configuration will be described.

  FIG. 6 is a circuit diagram of a control device for an injection molding machine according to an embodiment of the present invention, and FIG. 7 is a first diagram showing a state in front of the screw head when the metering process according to the embodiment of the present invention is completed. FIG. 8 is a second view showing a state in front of the screw head when the metering process in the embodiment of the present invention is completed, and FIG. 9 is a view of the screw head after the screw is advanced in the embodiment of the present invention. FIG. 10 is a first view showing a front state, FIG. 10 is a second view showing a front state of the screw head after the screw is advanced in the embodiment of the present invention, and FIG. 11 is a view in the embodiment of the present invention. FIG. 12 is a first diagram showing a state in front of the screw head after sucking back, and FIG. 12 is a second diagram showing a state in front of the screw head after performing suck back in the embodiment of the present invention. It is a diagram.

  In the figure, 11 is a heating cylinder, 13 is an injection nozzle, 14 is a screw head, 52 is a drive means, 53 is a screw position detector, 54 is a load detector, 55 is a control unit, 56 is a memory as storage means, 57 Is an alarm device as an alarm means.

  When the metering step is completed, the drive control means (not shown) of the control unit 55 drives the drive means 52, rotates the screw 12 (FIG. 1) in the reverse direction, and shuts off the resin flow path 35a (FIG. 3). Then, a load ΔP is applied to the screw 12 to advance the screw 12. For this purpose, the driving means 52 generates a force F corresponding to the load ΔP, and the screw 12 is pushed by the force F. In addition, a load detector 54 is disposed between the screw 12 and the driving means 52, feedback control is performed based on the load detected by the load detector 54, and a force F is generated by the driving means 52. Be made. Then, the control unit 55 reads the position of the screw 12 detected by the screw position detector 53 after applying the load ΔP to the screw 12 and moving the screw 12 forward.

  In this case, as shown in FIGS. 7 and 8, if the density of the metering resin varies, as shown in FIGS. 9 and 10, the forward movement of the screw 12 when a constant load ΔP is applied to the screw 12. The amount of movement, that is, the advance amount ΔS (ΔS0, ΔS1) varies, and the position of the screw 12 after the screw 12 has moved forward also varies. Therefore, a detection operation is included in a normal injection molding sequence, and the position of the screw 12 is calculated for each shot.

  In this case, every time the molded product is molded, the molded product is visually checked, and molding is performed until a high-quality molded product, that is, a non-defective product is molded. Then, after the measuring step immediately after the non-defective product is formed, the screw 12 is advanced to make the density of the measuring resin constant. Subsequently, a quality determination processing unit (not shown) of the control unit 55 determines the position of the screw 12 detected by the screw position detector 53 as the screw 12 moves forward as a reference position as a reference value, and stores it in the memory 56. Thereafter, the position of the screw 12 is monitored based on the reference position, and the quality of the molded product is determined. Therefore, the pass / fail judgment processing means detects the position of the screw 12 by the screw position detector 53 in each shot after the non-defective product is molded, and the difference between the detected position of the screw 12 and the reference position. If the difference is within the predetermined range, if the difference is within the predetermined range, it is determined that the molded product is good, and if the difference is not within the predetermined range, While knowing that a defect has occurred, it is determined that the molded product is defective.

For example, when the position of the screw 12 detected by the screw position detector 53 in each shot is Si and the reference position is S REF , S REF −α <Si <S REF + α (α: constant) It is determined that the molded product is a non-defective product. In this case, the position Si of the screw 12 takes a positive value forward in the heating cylinder 11 with the position Si of the screw 12 when the measuring step is completed as the origin. Further, when Si ≦ S REF −α, it is determined that the molded product is a defective product, the density of the metering resin is high, and molding defects such as flashing have occurred in the molded product. When S REF + α ≦ Si, it is determined that the molded product is a defective product, the density of the metering resin is low, and a molding failure such as a short shot has occurred in the molded product.

  In addition, when the non-defective product is molded, the quality determination processing means stores the number of shots from the start of molding until the non-defective product is molded in the memory 56 as a reference shot number, and molds the same type of molded product. In this case, the reference shot number is read from the memory 56, and when the number of shots from the start of molding to the present is equal to the reference shot number, the position Si of the screw 12 at that time is determined as the reference position.

  Subsequently, the suck back control means (not shown) of the control unit 55 drives the drive means 52 to perform the suck back, and as shown in FIGS. 11 and 12, the screw 12 is moved backward by a predetermined distance, and the screw 12 At the filling start position.

  In this way, since the quality of the molded product is determined based on the position Si of the screw 12 when the screw 12 is moved forward to make the density of the metering resin constant, the recycled resin is mixed with the resin that has never been used. When a resin with a different resin production lot is used, etc., the density of the metering resin varies, and if molding defects such as short shots and flashes occur, the molded product is defective. Can be determined.

  Even if the density of the metering resin is stable, when the check ring 31 of the backflow prevention device wears down and the backflow prevention function is reduced, the amount of resin injected is reduced, resulting in molding defects such as short shots. In this case, it can be determined that the molded product is defective.

  And after that, since the quality of a molded product can be determined before molding a molded product, a defective product is not molded. That is, when it is determined that the molded product is a defective product, the molding can be stopped and the defective product can be prevented from being molded. Further, since the defective product does not remain in the cavity space when the mold device 51 is opened, not only the operation of removing the molded product from the cavity space becomes unnecessary, but also the mold device 51 is attached with the mold clamping. It can be prevented from being damaged.

  In the present embodiment, the quality of the molded product is determined based on the position Si of the screw 12 detected by the screw position detector 53 after the load ΔP is applied to the screw 12 and the screw 12 is advanced. However, the quality of the molded product can also be determined based on the advance amount ΔS as a position variable when the load ΔP is applied to the screw 12 and the screw 12 is advanced.

  In that case, if the density of the metering resin varies, the advance amount ΔS varies. Therefore, the advance amount calculation processing means (not shown) of the control unit 55 puts a detection operation in a normal injection molding sequence and is based on the position Si of the screw 12 detected for each shot by the screw position detector 53. Then, the advance amount ΔS is calculated.

  Then, the pass / fail determination processing means determines the advance amount ΔS when the non-defective product is molded as a reference advance amount as a reference value, stores it in the memory 56, and then stores the advance amount ΔS based on the reference advance amount. Monitor to determine the quality of the molded product. Therefore, the pass / fail judgment processing means calculates the advance amount ΔS by the advance amount calculation processing means in each shot after the non-defective product is molded, and calculates the difference between the calculated advance amount ΔS and the reference advance amount. Calculate, determine whether the difference falls within the predetermined range, if the difference falls within the predetermined range, determine that the molded product is non-defective, and if the difference does not fall within the predetermined range, It is determined that the molded product is a defective product.

  In addition, when the non-defective product is molded, the quality determination processing means stores the number of shots from the start of molding until the non-defective product is molded in the memory 56 as a reference shot number, and molds the same type of molded product. In this case, the reference shot number is read from the memory 56, and when the number of shots from the start of molding to the present is equal to the reference shot number, the advance amount ΔS at that time is determined as the reference advance amount.

  In the present embodiment, the position Si of the screw 12 when a non-defective product is molded is determined as a reference position, or the advance amount ΔS when the non-defective product is molded is determined as a reference advance amount. However, when a non-defective product is molded, molding is performed for a predetermined number of shots, and the average value of the position Si of the screw 12 can be set as a reference position, or the average value of the advance amount ΔS can be set as a reference advance amount. .

  In that case, the average value calculation means of the quality determination processing means calculates the average value of the position Si of the screw 12 or the average value of the advance amount ΔS.

  In addition, this invention is not limited to the said embodiment, It can change variously based on the meaning of this invention, and does not exclude them from the scope of the present invention.

It is the schematic of the injection apparatus in embodiment of this invention. It is a front view at the time of the measurement process of the backflow prevention apparatus in embodiment of this invention. It is XX sectional drawing of FIG. It is a front view at the time of reverse rotation of the backflow prevention apparatus in embodiment of this invention. It is YY sectional drawing of FIG. It is a circuit diagram of the control apparatus of the injection molding machine in the embodiment of the present invention. It is a 1st figure which shows the state of the front of a screw head when the measurement process in embodiment of this invention is completed. It is a 2nd figure which shows the state ahead of the screw head when the measurement process in embodiment of this invention is completed. It is a 1st figure which shows the state ahead of the screw head after advancing the screw in embodiment of this invention. It is a 2nd figure which shows the state ahead of the screw head after advancing the screw in embodiment of this invention. It is a 1st figure which shows the state of the front of the screw head after performing the suckback in embodiment of this invention. It is a 2nd figure which shows the state of the front of the screw head after performing the suckback in embodiment of this invention.

Explanation of symbols

12 screw

Claims (5)

  1. (A) The screw is rotated in the measuring step to send the molten resin from the metering portion to the front of the screw head,
    (B) When the weighing process is completed, the screw is rotated in the opposite direction to shut off the metering part and the screw head,
    (C) Advance the injection member with a constant force, detect the position of the injection member,
    (D) calculating a difference between the detected position and a reference position;
    (E) determine whether the difference falls within a predetermined range;
    (F) A method for determining the quality of a molded product, wherein if the difference is satisfied, it is determined as a non-defective product, and if it is not satisfied, it is determined as a defective product.
  2.   The quality determination method for a molded product according to claim 1, wherein the position is a position of the injection member after the injection member is advanced.
  3.   The quality determination method for a molded product according to claim 1, wherein the position is an advance amount of the injection member when the injection member is advanced.
  4.    The quality determination method for a molded product according to claim 2, wherein the reference value is an average value of positions of the injection member after the injection member is advanced in a plurality of shots after the good product is molded.
  5. 4. The quality determination method for a molded product according to claim 3, wherein the reference value is an average value of an advancement amount of the injection member when the injection member is advanced in a plurality of shots after the good product is molded.
JP2005302710A 2005-10-18 2005-10-18 Production status indication device of molding machine Pending JP2006069219A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7654809B2 (en) 2006-12-20 2010-02-02 Fanuc Ltd Injection molding machine having a force peak time detecting device

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7654809B2 (en) 2006-12-20 2010-02-02 Fanuc Ltd Injection molding machine having a force peak time detecting device

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