KR870000197B1 - Injection molding machine - Google Patents

Injection molding machine Download PDF

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Publication number
KR870000197B1
KR870000197B1 KR820004511A KR820004511A KR870000197B1 KR 870000197 B1 KR870000197 B1 KR 870000197B1 KR 820004511 A KR820004511 A KR 820004511A KR 820004511 A KR820004511 A KR 820004511A KR 870000197 B1 KR870000197 B1 KR 870000197B1
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KR
South Korea
Prior art keywords
shaft
injection
clutch
screw
transmission
Prior art date
Application number
KR820004511A
Other languages
Korean (ko)
Other versions
KR840001883A (en
Inventor
요시히꼬 야마사끼
Original Assignee
시마 요시하루
닛세이 쥬시고오교 가부시끼 가이샤
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Priority to JP16068181A priority Critical patent/JPS6157168B2/ja
Priority to JP160681 priority
Application filed by 시마 요시하루, 닛세이 쥬시고오교 가부시끼 가이샤 filed Critical 시마 요시하루
Publication of KR840001883A publication Critical patent/KR840001883A/en
Application granted granted Critical
Publication of KR870000197B1 publication Critical patent/KR870000197B1/en

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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/17Component parts, details or accessories; Auxiliary operations
    • B29C45/46Means for plasticising or homogenising the moulding material or forcing it into the mould
    • B29C45/47Means for plasticising or homogenising the moulding material or forcing it into the mould using screws
    • B29C45/50Axially movable screw
    • B29C45/5008Drive means therefor
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/17Component parts, details or accessories; Auxiliary operations
    • B29C45/40Removing or ejecting moulded articles
    • B29C45/4005Ejector constructions; Ejector operating mechanisms
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/17Component parts, details or accessories; Auxiliary operations
    • B29C45/70Means for plasticising or homogenising the moulding material or forcing it into the mould, combined with mould opening, closing or clamping devices
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/17Component parts, details or accessories; Auxiliary operations
    • B29C2045/1784Component parts, details or accessories not otherwise provided for; Auxiliary operations not otherwise provided for
    • B29C2045/1792Machine parts driven by an electric motor, e.g. electric servomotor
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/17Component parts, details or accessories; Auxiliary operations
    • B29C45/40Removing or ejecting moulded articles
    • B29C45/4005Ejector constructions; Ejector operating mechanisms
    • B29C2045/4042Ejector constructions; Ejector operating mechanisms driven by rack and pinion means
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/17Component parts, details or accessories; Auxiliary operations
    • B29C45/46Means for plasticising or homogenising the moulding material or forcing it into the mould
    • B29C45/47Means for plasticising or homogenising the moulding material or forcing it into the mould using screws
    • B29C45/50Axially movable screw
    • B29C45/5008Drive means therefor
    • B29C2045/5032Drive means therefor using means for detecting injection or back pressures
    • B29C2045/5036Drive means therefor using means for detecting injection or back pressures back pressure obtaining means
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/17Component parts, details or accessories; Auxiliary operations
    • B29C45/46Means for plasticising or homogenising the moulding material or forcing it into the mould
    • B29C45/47Means for plasticising or homogenising the moulding material or forcing it into the mould using screws
    • B29C45/50Axially movable screw
    • B29C45/5008Drive means therefor
    • B29C2045/5076Drive means therefor using a single drive motor for rotary and for axial movements of the screw

Abstract

Plastic injection molding machine without the hydraulic device comprises the surbo motor processing between the conclusion of metal mold and the injection of molten resin, the clutch and the brake converting a rotation of the surbo motor into conclusion force of metal mold or injection force of molten resin, and the gear means stuck to the driving axle of the surbo motor through a clutch. The surbo motor can control an injection velocity because it generates a large torque inertia rate and a wide range of variable velocity.

Description

Injection molding machine

1 is a schematic longitudinal cross-sectional view showing the basic structure of the injection molding machine of the present invention.

2 is a cross-sectional view of an electromagnetic brake used as a device and a force retaining device for the back pressure of the machine according to the present invention.

3 is a cross-sectional view of the same clutch.

4 is a longitudinal sectional view of an injection molding machine showing a specific structure of the injection molding machine of the present invention.

5 is a cross-sectional view taken along the line V-V in FIG.

6 is a sectional view taken along the line VI-VI of FIG.

7 is a sectional view taken along the line VII-VII of FIG.

8 is a cross-sectional view showing another embodiment of the rotation and advancement mechanism of the injection screw.

9 is a block diagram of a current detection and control device.

10 is a partial longitudinal sectional view of the type fastener showing the protruding device.

11 is a sectional view taken along the line XI-XI of FIG.

12 is a partial longitudinal cross-sectional view of the mold clamping mechanism showing the protruding device of another embodiment.

* Explanation of symbols for main parts of the drawings

1: type fastening mechanism 2: injection mechanism

3: bed 10, 11: fixed plate

12: connecting rod 13: movable plate

14 mold 15 plunger

16: rotating plate 20: injection screw

21: injection heater 22: housing

25: movable member 30, 31: electric shaft

32: clutch mechanism 32a: clutch member

32b: clutch shaft 32c: coupling

33: joint 36, 37: electric gear

40: servo motor 41: generator for the rotation system

42: force holding device 42a: brake member

42b: coupling 46: electric shaft

52 nozzle contact member 53 clutch mechanism

59 current detector 60 comparator

62: position detector 64: back pressure control amplifier

The present invention relates to an injection molding machine which operates both a mold clamping mechanism and an injection mechanism by the same motor, and injects molten resin on the injection mechanism side into a mold on the mold fastening mechanism side.

In general, an injection molding machine uses hydraulic pressure as a drive source. However, the use of hydraulic pressures involves a number of problems, in particular, the instability of the change in the viscosity of the hydraulic fluid to the operation of the machine has a great influence on the injection molding of the resin. In addition, expensive hydraulic equipment such as hydraulic pumps, various hydraulic control valves, hydraulic cylinders, hydraulic motors, heat exchangers, etc. are required, as well as management of hydraulic oil temperature and contamination, and replacement of hydraulic fluid due to deterioration of quality. It is necessary.

As one means of solving the problem in the case of using such a hydraulic pressure as a drive source, it is conceivable to operate the machine by an electric motor. In fact, although the use of electric motors in injection molding machines has been proposed in some cases, it is not that the whole injection molding machine is operated by electric motors, and the mold clamping mechanism is used as a means for rotating the screw of the injection molding machine and is used only in conjunction with hydraulic pressure. It was only to.

The difficulty in carrying out the entire process with one electric motor in an injection molding machine lies in the responsiveness of a conventional electric motor. Unlike cutting of objects, etc., in injection molding, a speed control region and a force control region exist during one molding cycle. Therefore, the injection molding machine cannot be operated by one electric motor unless the electric motor is operated in response to the area.

The present invention uses a servo motor used in a machine tool to drive an injection molding machine, and continuously executes a process from mold clamping to injection of molten resin, thereby solving various problems caused by conventional hydraulic pressure. It is to be solved. In addition, the present invention converts the rotation of the servo motor into a force by using the required number of clutches and brakes, thereby generating mold clamping force or dead power equivalent to that in the case of using hydraulic pressure, so that injection molding can be performed without using hydraulic pressure. It is an object of the present invention to provide a possible machine.

The present invention is configured to operate both the mold clamping mechanism side and the injection mechanism side by one servo motor. Servo motors can get quite large torque when running at low speeds and can be driven directly without the use of reduction gears. In addition, the servo motor has a large torque inertia ratio and a wide range of variable speeds, so that the injection speed can be controlled appropriately. Feedback control may be employed to achieve stabilization of dead power and mold clamping force. As a result, power can be saved and the apparatus can be simplified, so that the machine is excellent in economy. In addition, since the hydraulic fluid is completely unnecessary, the power transmission efficiency is higher than that of the hydraulic system, which not only saves power but also makes maintenance of the machine extremely easy.

In addition, the present invention is a combination of the gear means for opening and closing the mold and the mold fastening and the gear means for rotating or advancing the injection screw to the transmission shaft operated by the servo motor through a clutch, and a series of injection by the operation of the clutch It is a structure which performs a shaping | molding process.

In addition, the present invention includes a back pressure control device and a force holding device by an electromagnetic brake, whereby the back pressure or the holding pressure can be controlled arbitrarily and precisely without using hydraulic pressure. In particular, the hysteresis brake is used only to control the back pressure, and in the present invention, it is the best measure to use the hysteresis brake to control the back pressure. In addition, the present invention has a structure capable of converting the rotation of the servo motor to the movement of the injection mechanism by the screw shaft, whereby a series of processes such as the mold clamping process, the nozzle contact process, and the injection process can be carried out continuously. have. Threads formed around the screw shaft and the plunger of the mold clamping mechanism are preferably ball screws. The friction that occurs at the contact between the ball and the threads on the side of the receiving member inserted into the slot is in the form of rolling friction, which means that the transmission efficiency due to the engagement between the threads is much greater than in the conventional threads and the loss of force is small. Because.

The servomotor used for this invention may be a normal thing with the specification currently used, and what is marketed also an electromagnetic clutch, an electromagnetic brake, etc. can be employ | adopted as it is.

In addition, in the present invention, the part operated by the hydraulic means is operated by mechanical means, the configuration of the other parts is exactly the same as the conventional one, and according to the rated output of the servo motor, a small to relatively large injection molding machine with an injection capacity of 5 cm 3 Can be prepared.

BRIEF DESCRIPTION OF DRAWINGS To understand the present invention more clearly, the present invention will be described below with reference to the accompanying drawings.

1 schematically shows the basic structure of an injection molding machine according to the present invention, in which 1 represents a mold clamping mechanism and 2 represents an injection mechanism. The type fastening mechanism 1 includes a pair of fixing plates 10 and 11 opposed to the machine bed 3, a required number of connecting rods 12 and the connecting rods 12, which are provided over the fixing plates 10 and 11, and the connecting rods ( And a movable plate 13 movably mounted to 12). The mold 14 is provided in the opposing surface between the said fixed plate 11 and the movable plate 13, respectively, and the large diameter plunger 15 in which the ball screw was formed in the side surface in the opposing surface of the movable plate 13, respectively. ) Is connected. Ball threads have high transmission efficiency and low starting friction. The plunger 15 is screwed into the threaded receiving member 16b inside the rotating plate 16 rotatably installed by using a ball bearing or the like to the fixing plate 10 forming the fixing member, and is adapted to the rotation of the rotating plate 16. Is moved in the axial direction. The rotary plate 16 is provided with a gear 17 engaged with an electric gear, which will be described later.

The injection mechanism 2 has an injection heating cylinder 21 incorporating the injection screw 20 and a housing 22 on the machine bed 3 which serves to hold the injection heating cylinder 21. Inside the housing 22, a rotating shaft 24 having a screw shaft 23 is provided in the lateral direction, and the movable member 25 is screwed to the screw shaft 23. The rear end of the screw 20 is integrally connected with the screw 20 by an extension shaft 26 having the front end accommodated in the movable member 25. The rotating shaft 24 and the extension shaft 26 have a screw forward gear 27 and a screw rotation gear 28 at positions not interfering with each other, and are fixed to the housing wall portion 22a at the end of the rotation shaft 24. The back pressure control device 29 is attached by the electromagnetic brake.

In the lower portion of the housing 22, a transmission shaft 31 parallel to the rotation shaft 24 and the extension shaft 26 is provided through the housing 22. Moreover, below the said type fastening mechanism 1, the transmission shaft 30 parallel to the said plunger 15 penetrates through the said pair of fixed plates 10 and 11, and is provided. The two transmission shafts 30 and 31 on the type fastening mechanism side and the injection mechanism side are connected to each other via a clutch mechanism 32 so as to be accessible and detachable from each other.

The clutch mechanism 32 includes a clutch member 32a fixed to an end of the transmission shaft 31, a clutch shaft 32b disposed on the extension shaft center of the transmission shaft 31 and rotatably attached to the housing wall portion; And a coupling 32c fixed to the inner end of the clutch shaft 32b, and the excitation portion is fixed to the housing side. And the joint 33 for connecting the transmission shaft 30 to the outer end part of this clutch shaft 32b is provided. The joint 33 and the transmission shaft 30 are connected by means 34, such as a spline or key, which permits movement in the axial direction, so that the injection mechanism 2 with respect to the mold clamping mechanism 1 In the forward or backward movement, the transmission shafts 30 and 31 interconnected by the clutch shaft 32b do not interfere with the movement.

The transmission shaft 35 is provided on the transmission shaft 35 adjacent to the inner side of the fixed plate 10 and engaged with the gear 17 of the rotation plate 16, and the transmission shaft 35 is driven by the transmission gear 35. The rotational force of the transfer plate 13 is transmitted to the rotating plate 16, and the plunger 15 screwed with the rotating plate 16 is guided in the axial direction by the rotation of the rotating plate 16, so that the movable plate 13 is connected to the connecting rod 12. It moves in the direction of closing or opening the mold.

Moreover, the transmission gears 36 and 37 which mesh with the teeth 27 and 28, respectively, are provided in the said transmission shaft 31 via the clutch members 38 and 39. As shown in FIG. The clutch members 38 and 39 include a coupling associated with the transmission gears 36 and 37 and an excitation portion fixed to the housing shaft, and are operated by the clutch plate and the excitation portion provided therein. , 37) and the transmission shaft 31 is coupled or released.

In addition, the shaft portion projecting outward from the housing wall portion 22a of the transmission shaft 31 is connected to a servo motor 40 having a generator 41 for rotation system fixed to the housing wall portion 22a.

In addition, the clutch shaft 32b is provided with an apparatus 42 for holding a mold clamping force. The force holding device 42 is composed of an electromagnetically actuated brake member 42a fixed to the housing wall portion 22a and a coupling 42b provided on the clutch shaft side.

2 shows an example of a brake (MWB type brake, Ogura clutch company, limited product) used as the back pressure control device 29 described above. This brake is adjacent to the internal driver 29a, armature 29b, a plurality of brake plates 29c separated in and out of the inner shaft 29b, and the brake plate 29c, which is fixed to the outer end of the rotary shaft 24, and coil 29d. ), The field core (29e) is fitted to the rotating shaft (24) by a ball bearing (29f) and is fixed to the housing wall portion (22a) via a casing.

In such a brake, the armature 29b and the braking plate 29c are engaged by the magnetic flux generated by the energization of the coil 29d, and the rotation of the rotation shaft 24 is controlled by the frictional force. It should also be noted that this brake can also be used as a force retaining device.

3 shows an example of a clutch (MWC type clutch, Ogura clutch company, limited product) particularly used for the clutch members 38 and 39 and the clutch mechanism 32 of the electric gears 36 and 37. . This describes the clutch member 38.

The clutch includes an internal driver 38a having a key fixed to the transmission shaft 31, an armature 38b fitted to a spline formed on the outer circumferential surface of the internal driver 38a, a clutch plate 38c composed of a plurality of inner and outer plates, and It consists of an electron 38d and a field core 38e adjacent to the internal driver 38a, which has a coil 38f embedded therein and is connected to the transmission shaft 31 via a ball bearing 38g. It is fitted and fixed to the housing side so as not to rotate together with the transmission shaft 31.

In addition, the transmission gear 36 has a coupling 36a on a side surface thereof, and is rotatably attached to the transmission shaft 31 by a ball bearing 36b. The coupling 36a is connected to the outer plate of the clutch plate 38c, and the armature 38b, the clutch plate 38c, and the rotor 38d are coupled by a magnetic force generated when the coil 38f is energized. When rotating, it rotates together with the internal driver 38a by the friction force generated there.

Next, the injection molding operation will be described.

First, the clutch mechanism 32 is energized to attract the clutch plate 32c to the clutch member 32a, and the transmission shafts 30 and 31 are integrally connected by the clutch shaft 32b. On the other hand, on the transmission shaft 31 side, the energization to the clutch members 38 and 39 is stopped and the transmission gears 36 and 37 are set free with respect to the transmission shaft 31. In this state, the servomotor 40 is operated in the forward rotation. By this rotational operation, the two transmission shafts 30, 31 rotate in the same direction at the same time, and the gear 35 on the transmission shaft 30 side also rotates. Since the gear 17 of the rotary plate 16 is engaged with the electric gear 35, the rotary plate 16 also starts to rotate, and the plunger 15 together with the movable plate 13 in the mold closing direction, that is, the first Push in the right direction in the figure. By the movement of this movable plate 13, the metal mold | die 14 is closed between the fixed plate 11 and the movable plate 13, and mold clamping is carried out more strongly. This mold clamping pressure is detected by the current value in the servo motor 40.

Next, when the mold clamping pressure reaches the set pressure due to the biasing force of the plunger 15, energization is started to the force retaining device 42, and by the engagement of the internal brake plate, the transmission shaft 30 becomes the clutch shaft ( It is fixed to the housing side via 32b) and the coupling 42b. Subsequently to this fixing operation, in the clutch mechanism 32, energization to the clutch member 32a is stopped, and thus the inner clutch plate is freed to release the connection between the two transmission shafts 30 and 31. As a result, the transmission shaft 30 on the side of the mold clamping mechanism 1 is fixed at the time of detecting the set pressure, and various parts connected to the transmission shaft 30 are fixed to maintain the mold clamping pressure.

On the injection mechanism 2 side, the energization to the clutch member 32a is stopped and energization occurs to the clutch member 39, the internal clutch plate is coupled by magnetic force, and the electric gear 37 passes through the coupling 37a. It is fixed to the transmission shaft 31 and starts forward rotation.

As the electric gear 37 rotates, the gear 27 rotates in the reverse direction, that is, counterclockwise, together with the rotation shaft 24 to remove the movable member 25 screwed to the screw shaft 23. Send it to the left in 1 degree. Since the extension shaft 26 of the injection screw 20 is rotatably attached to the movable member 25, the injection screw 20 also moves to the left side, that is, forward by the movement of the movable member 25. The molten resin, which has been previously weighed in the distal end of the injection heating tube 21, is injected from the nozzle into the cavity formed by the mold 14.

When the injection of the molten resin is completed, the servo motor 40 is also stopped. This stop can be easily performed by employing the electric detection means usually used in the conventional injection molding machine and the electric control means operated by the signal transmitted at the time of detection.

Almost simultaneously with the stop operation of the servo motor 40, the energization to the clutch member 39 which is being excited is stopped, and as a result, the electric gear 37 is free and the rotation shaft 24 also stops. Subsequently to this stop operation, the other clutch member 38 is energized and the inner clutch plate 38c is engaged, and the electric gear 36 rotates while fixing the transmission shaft 31 via the coupling 36a. . When this series of clutch operations is completed, the servo motor 40 is rotated again. This rotation direction is in the opposite direction from the previous one, that is, counterclockwise. Accordingly, the electric gear 36 also rotates counterclockwise with the electric shaft 31 to rotate the tooth 28 clockwise. Since the gear 28 is fixed to the extension shaft 26 of the injection screw 20, the injection screw 20 also rotates clockwise so that the material resin from the hopper 43 is moved forward by the screw. I send it to you. This material resin is melted and calcined by the injection heating tube 21 and stays at the tip of the injection screw 20. As the molten resin increases, the injection screw 20 is retracted by the resin pressure while rotating. Since the rear portion of the injection screw 20 is rotatably connected to the movable member 25 via the extension shaft 26, the movable member 25 is provided with the gears of the injection screw 20 and the extension shaft 26 ( 28, it moves in the right direction in FIG. 1, and a retraction force is applied to the movable member 25 to act on the screw shaft 23 further to rotate the rotating shaft 24 by the screw lead. At this time, when the back pressure control device 29 is operated to impart a predetermined rotational resistance to the rotary shaft 24, screw back pressure is generated thereon, and plasticization and metering of the material resin are performed under a constant screw back pressure.

When the movable member 25 returns to a predetermined position, that is, the original position, the servo motor 20 is stopped and the energization of the clutch member 38 is stopped, so that the electric gear 36 is free. The rotation of the injection screw 20 is stopped via the gear 28, and the metering is completed while the retraction of the injection screw 20 is eliminated. Following this metering operation, the energization to the force holding device 42 is stopped, and the transmission shaft 30 is free with the clutch shaft 32b. Then, the clutch member 32a of the clutch mechanism 32 is moved. Is operated by energization and is connected to the transmission shaft 31 and the clutch shaft 32b. As a result, the two transmission shafts 30 and 31 are integrally connected via the clutch shaft 32b to reversely rotate the servo motor 40 so as to reversely rotate the transmission shaft 30.

By the rotation of the electric shaft 30 again, the rotary plate 16 connected via the electric gear 35 and the gear 17 rotates counterclockwise as opposed to the above, and the plunger 15 is rotated by a screw lead. Move to the original position. Thereby, the movable plate 13 also moves backward with one mold 14, and mold opening occurs. When it is electrically detected that the movable plate 13 has reached its original position, the servo motor 40 is stopped to terminate injection molding in one cycle.

The example shown below in FIG. 4 further embodies the injection mechanism side, and enables the injection mechanism to be moved by a servo motor (Sanyo Denki Co., Ltd., DC type CN-2000 type).

In addition, the specific structure of the mold clamping mechanism can be clearly seen with reference to FIG.

Hereinafter, the same parts as in the above embodiment will be described with the same reference numerals.

The housing 22 holding the injection heating tube 21 containing the injection screw 20 of the injection mechanism 2 is provided with guide rails formed on both sides of the upper part of the machine bed 3 as shown in FIG. 44 is fitted to both lower parts, and is arrange | positioned so that a movement with respect to the clamping mechanism 1 is possible.

Above the housing 22, an extension shaft 26 provided at the rear end of the injection screw 20 is attached with a gear 28 for screw rotation. Moreover, the end part of the extension shaft 26 is rotatably connected to the movable member 25 for advancing a screw. As shown in FIG. 5, this movable member 25 is hold | maintained by slidably inserting both side parts through the pair of guide rod 45 provided horizontally over the front and back wall of the housing 22. As shown in FIG. Moreover, in the rear part of the movable member 25, the screw shaft 23 rotatably held by the housing wall part 22a via the thread accommodating member 25a is screwed together, and the screw shaft 23 The gear 27 for screw advancement is attached to the rotating shaft 24 of (). The outer end of the shaft portion of the screw shaft 23 is connected to a back pressure control device 29 having a brake fixed to the housing wall portion 22a.

In the lower part of the said housing 22, as shown in FIG. 6, a pair of parallel transmission shafts 31 and 46 are rotatably provided. These transmission shafts 31 and 46 are rotated at the same time by engaging the gears 47 and 48 attached to each. Moreover, the servo motor 40 attached to the lower surface of the said housing 22 is connected to the outer end part of one transmission shaft 46. As shown in FIG. This connection is performed by hanging the drive belt 51 on the belt wheels 49 and 50 provided at each shaft end, and the transmission shafts 31 and 46 are synchronized with the rotation of the servo motor 40.

The transmission shaft (37) is attached to the transmission shaft (37) which engages with the screw advance gear (27) via the clutch member (39), and the clutch member (38) is attached to the transmission shaft (46). An electric gear 36 is engaged with the gear 28 for screw rotation.

The inner end of the transmission shaft 31 is connected via the clutch shaft 32b and by the clutch mechanism 32 so as to be accessible and detachable from the transmission shaft 30 on the side of the mold clamping mechanism 1. The clutch shaft 32b is provided with a joint 33 and a force holding device 42 as in the case of FIG.

In addition, at the inner end of the transmission shaft 46, a nozzle contact mechanism 52 connecting the fixing plate 11 on the side of the mold clamping mechanism 1 and the housing 22 penetrates the housing 22. It is rotatably supported with respect to the wall part 22a, and is provided.

The nozzle contact mechanism 52 is composed of a screw shaft 52b screwed to a shaft portion 52a and a nut-shaped thread receiving member 52c attached to the fixing plate 11, and further comprises a shaft portion 52a and a transmission shaft. The clutch mechanism 53 is provided over the inner end of the 46. The clutch mechanism 53 includes an electromagnetically actuated clutch member 53a provided on the transmission shaft 46 and a coupling 53b connected to an end portion of the shaft portion 52a. The electric shaft 46 and the shaft portion 52a are connected to each other by excitation, and the screw shaft 52b is rotated, and the housing 22 is moved together with the injection mechanism to the mold-fastening mechanism side by the screw lead to perform nozzle contact. .

Moreover, in the nozzle contact mechanism 52, the nozzle contact type force retention device 54 comprised by the electromagnetic actuation brake is arrange | positioned over the housing wall part 22a and the connection 52a.

The example shown in FIG. 8 shows another moving means of the movable member 25 on the injection mechanism 2 side. This embodiment is intended to move the movable member 25 by the rotation of the guide rod (45). To this end, the guide rod 45 is rotatably mounted to the housing wall portion 22a, and at the same time, a screw shaft 45a is formed at the middle thereof, and the members 25b at both ends of the movable member 25 are formed. A thread is also formed in the drilled hole, and the screw and the screw shaft 45a are screwed together so that the movable member 25 is advanced by the screw lead. In addition, the rotation of the guide rod 45 is performed by attaching the gear 45b which meshes with the gear 27 of the said rotating shaft 24 rotatably protruded to the center of the rear part of the movable member 25. As shown in FIG. .

Next, the operation of the injection mechanism of the above embodiment will be described in detail.

The servo motor 40 is rotated forward with the clutch mechanism 32 connected to the transmission shafts 30 and 31 via the clutch shaft 32b. At this time, on the injection mechanism 2 side, the electric gears 36 and 37 are left free by the opening operation of the clutch members 38 and 39. In addition, the clutch mechanism 53 between the transmission shaft 46 and the nozzle contact mechanism 52 is also opened to disconnect the connection. On the side of the mold clamping mechanism, as in the case of FIG. 1, the rotating plate 16 is rotated by the electric shaft, the electric gear 35, and the tooth 17, and the plunger 15 is sent out. As a result, the movable plate 13 moves forward, the mold 14 is closed, and more powerful mold tightening is achieved. When the mold clamping pressure reaches a predetermined pressure, the force holding device 42 is operated electronically to fix the transmission shaft 30 together with the clutch shaft 32b on the housing side to stop the rotation of the servo motor 40, In addition, the clutch mechanism 32 is opened to disconnect the transmission shaft 31. Subsequently to this operation, the clutch mechanism 53 is closed by an instruction on the injection mechanism side, so that the electric shaft 46 and the shaft portion 52a of the nozzle contact mechanism 52 are connected to each other so that the servo motor 40 is connected. It rotates simultaneously with the screw shaft 52b by rotation. By this rotation, the screw shaft 52b enters into the fixed plate and pulls the housing 22. At this time, since the transmission shaft 30 is slidably connected in the axial direction via the joint 33, the housing 22 moves toward the fixed plate 11 on the machine bed regardless of the transmission shaft 30, There the nozzle contact takes place.

When the nozzle contact is confirmed by a position detector such as a sensor, the nozzle contact force holding device 54 is activated and the rotation of the servo motor 40 is stopped so that the clutch mechanism 53 is opened and then the clutch member is opened. (39) closes by instruction, connects the electric shaft 31 and the electric gear 37, rotates the servo motor 40, and connects the gear 27 for injection, and the servo motor. 40 is rotated to rotate the gear 27 for injection together with the screw shaft 23. By the rotation of the screw shaft 23, the injection is achieved while the movable member 25 is advanced to push the screw 20.

When the injection is completed, the servo motor 40 stops, and at the same time, the clutch member 39 is opened by the command, thereby allowing the electric gear 37 to be placed in the free state with respect to the electric shaft 31. In addition, in the transmission shaft 46, the clutch member 38 closes, and the transmission shaft 46 and the transmission gear 36 are connected. Then, when the servo motor 40 reversely rotates by the instruction, the gear rotation gear 28 rotates with the extension shaft 26 together with the electric gear 36, and the screw 20 also rotates with the material. Filling is initiated. At this time, the back pressure control device 29 is operated to generate the screw back pressure. In the material from the hopper, the screw 20 is melt-fed to the screw tip by rotation, and at that pressure, the screw 20 retreats together with the movable member 25. This retraction is confirmed electrically, and when the metering is completed, the servo motor 40 pauses, and then the servo contact force holding device 54 is opened and the clutch mechanism 53 is closed. When the motor 40 reversely rotates again, the screw shaft 52b also reverses, forcing the housing 22 to return to its original position, thereby disconnecting the nozzle contact. This confirmation is made by the sensor, so after this one cycle of injection molding process is finished, each part is exchanged for the next injection process.

The output of the current flowing in the servo motor 40 at the time of mold clamping and injection can be detected by the apparatus shown in FIG. 9, and control can be performed by the output detection. In this apparatus, the speed setter 57 and the torque setter 58 are connected in parallel between the centralized control unit 55 and the motor control amplifier 56 connecting the servo motor 40 and the generator 41 for the rotation system. I install it. In addition, a current setter 61 is connected to the current detector 59 provided in the circuit of the servo motor 40 via a comparator 60, and the comparator 60 is connected to the centralized control device 55. have.

Further, the centralized control device 55 includes the clutch mechanism 32, the mold clamping force holding device 42, the position detector 62, the operation switch 63, and the back pressure control amplifier 64 of the back pressure control device 29. Are connected respectively.

Next, the detection of the force in the mold clamping force holding will be described. In the state where the transmission shafts 30 and 31 are connected by the clutch mechanism 32 and via the clutch shaft 32b, the servo motor 40 Rotate forward.

When the movable plate 13 is moved and the mold 14 is closed, large torque is generated and the current rises. At this time, the comparator 60 compares the detected currents in the current setter 61 and the current detector 59 in which the torque is set to the desired torque in the comparator 60, and generates a matched confirmation signal. ), The clamping force holding device 42 is excited, and the transmission shaft 30 is fixed to the housing side. By fixing this transmission shaft 30, the movable plate 13 will hold | maintain a mold clamping state.

Further, following excitation of the mold clamping force holding device 42, the clutch mechanism 32 is electrically opened to disconnect the connection with the transmission shaft 31. As shown in FIG. Then, the rotational force by the servo motor 40 is used for nozzle contact or injection.

Although the said embodiment is a case of detecting the mold clamping force in an injection molding machine, it is also possible to detect and control nozzle contact force, injection pressure, and screw rotational force with the same means.

10 and 11 show a molded article projecting device by a motor. The protruding device includes a protruding pin 66 provided through a connection member 65 of the plunger 15 provided on the rear surface of the movable plate 13, a rotation driving device 67 provided at the lower end of the starting plate 13, and And a rotation shaft 68. In addition, the rotating plate 16 has a ball bearing and is rotatably mounted to the fixed plate 10, and the plunger 15 is screwed to the threaded buoy member 16b fixed in the rotating plate.

The rotation drive device 67 is composed of an electric motor, a speed changer, and a speed reducer. The rotation of the electric motor is appropriately shifted or decelerated according to a molded product, and is transmitted to the rotation shaft 68, and the protruding pins are formed by the rotation shaft 68. 66) to move forward and backward.

In addition, the contact between the rotating shaft 68 and the protruding pin 66 is performed with a gear means. In the illustrated example, the rack 69 is installed on the rear side of the protruding pin 66, while the rack 69 having the pinion 70 is coupled to the rotating shaft 68, thereby interlocking the rack 69 with each other. ) And pinion 70 are used to advance and retract the protruding pins.

FIG. 12 shows the mold clamping mechanism 1 and the protruding device of another embodiment. The rotating plate 16 of the mold clamping mechanism 1 includes a rotating cylinder 16a, which is held in a fixed plate 10 and rotatably inserted therethrough, and a thread receiving member fitted to an inner end of the rotating cylinder 16a. And a tooth 17 engaged with the tooth 35 of the transmission shaft 30 at an outer end thereof. Further, a plurality of balls 16c engaged with the ball screws 15a on the outer circumferential side of the plunger 15 are provided on the inner surface of the thread receiving member 16b. The protruding device is configured such that the protruding rod 72 extends through a hole drilled from the plunger 15 to the movable plate 13. The rear end of the protruding rod 72 is attached to the fixing plate 10, and a nut (in the center of the receiving member 73 serving as a cover provided at a predetermined distance between the outer end of the plunger 15). By being connected via 74, it is in a fixed state with respect to the movable plate 13 and the plunger 15. Therefore, the tip of the protruding rod 72 protrudes from the movable plate 13 every time the mold is opened. In addition, the amount of protrusion of the protrusion bar 72 from the movable plate 13 can be arbitrarily adjusted by the screw shaft 72a and the nut 74 of the rear end of the protrusion bar.

Although the servo motor 40 in the said embodiment is all connected to the transmission shaft of the injection mechanism 2 side, the installation position may be the type fastening mechanism 1 side, At that time, the motor will be the transmission shaft 30 Is connected to. Therefore, the installation position of a servo motor is not specifically limited.

As described above, the injection molding machine according to the present invention is useful as a molding machine for a synthetic resin which does not use a hydraulic device at all, and especially when hydraulic pressure is used as a power, it is possible to solve the instability of the viscosity change of the working oil on the machine and to transmit power. The efficiency is increased by the hydraulic pressure, and can be applied as an optimum molding machine which can save power.

Claims (7)

  1. Opposing between the movable plate 13 and the movable plate 13, which are arranged to be moved forward and backward with respect to the fixed plate 11, using the fixed plate 11 and the connecting rod 12, etc. installed on the machine bed 3 as guide members. It is coupled to the mold 14 attached to the surface and the opposite side of the movable plate 13 and internally screwed to the plunger 15 and the plunger for fastening the mold formed with a thread around it to move the plunger in the axial direction. A main fastening mechanism 1 comprising a rotating plate 16 and a fixed plate 10 that forms a fixing member behind the movable plate 13 holding the rotating plate 16 and adjacent to the fastening mechanism 1. And an injection heating tube 21 having a housing 22 installed on the machine bed 3 so as to be fixed or movable and attached to the fixing plate 11 side of the housing 22 and having an injection screw 20 therein. In the injection molding machine of synthetic resin provided with the injection mechanism (2),
    A part having the transmission shafts 30 and 31 across the mold clamping mechanism 1 and the injection mechanism 2 and positioned on the mold clamping mechanism 1 side of the transmission shaft and the gear installed over the rotating plate 16 ( Transmission means including 17 and 35, forward and rotation operation means of the injection screw by the rotary shaft 24 and the gears 27 and 28 provided in the housing 22, and the transmission shafts 30 and 31 It is provided with the electronically automatic clutch members 38 and 39 at a portion located on the injection mechanism 2 side and meshes with a plurality of gears 27 and 28 of the forward and rotary actuation means of the injection screw 20 respectively. Transmission means including electric gears 36 and 37, a servo motor 40 acting as a drive source for driving the electric shafts 30 and 31, and a mold clamping mechanism 1 by the servo motor 40. An electronically actuated clutch mechanism 32 which temporarily stops the application of the rotational force to the side, and retains the clamping force during the temporary stop Occupied by an injection molding machine, characterized in that it consists of the power holding device 42 by the electron-operated brake member (42a).
  2. The screw shaft 23 of the rotating shaft 24 in the housing 22 parallel to the extending shaft and the extension shaft 26 of the rear end of the injection screw 20. A movable member 25 movably installed over the shaft, an injection screw rotation gear 28 fixed to the extension shaft 26, and an injection screw advance gear 27 fixed to the rotation shaft 24. Injection molding machine characterized in that.
  3. According to claim 1, installed on the rotary shaft 24 of the forward and rotational operation means of the injection screw 20 or via another element, to control the rotation of the injection screw 20 through the rotary shaft 24 And a back pressure control device (29) made of an electromagnetic brake for giving back pressure when the injection screw (20) is retracted.
  4. 2. The transmission shaft (30) and (31) of claim 1 are arranged in a manner of being divided into a mold clamping mechanism (1) side and an injection mechanism (2) side, both of which are capable of axial movement between the clutch mechanism (32) and the transmission shaft. An injection molding machine characterized in that it is connected via a joint (33) at the end of the allowable clutch shaft (32b).
  5. The injection molding machine according to claim 1, wherein the servo motor (40) is fixed to the housing (22) and connected to a transmission shaft (31) on the injection mechanism (2) side.
  6. 2. The transmission shaft according to claim 1, wherein the transmission shaft on the injection mechanism (2) side comprises two transmission shafts (31, 46) arranged in parallel in the housing (22), and these transmission shafts are mutually driven by teeth (47, 48). One of the transmission shafts 31 is connected to the transmission shaft 30 on the side of the clamping mechanism 1 via a joint 33 allowing the clutch mechanism 32 and the axial movement, The coaxial 46 has a shaft portion 52a having a screw shaft 52b for screwing into a screw receiving member on the side of the mold clamping mechanism 1, and a nozzle contact force holding device provided over the shaft portion and the housing 22 side. An injection molding machine characterized in that it is connected to the nozzle contact mechanism (52) consisting of (54) via an electronically actuated clutch mechanism (53).
  7. 2. The clutch mechanism 32 and the mold clamping mechanism 1 side according to claim 1, which are arranged between the transmission shaft 30 on the mold clamping mechanism 1 side and the transmission shaft 31 on the injection mechanism 2 side. Of the centralized control device 55 connected to each of the force holding device 42, the nozzle position detector 62, and the back pressure control device 29, and the servo motor 40 and the generator 41 for the rotation system. A control amplifier 56, a speed setter 57 and a torque setter 58 provided in parallel between the centralized control device 55 and the motor control amplifier 56, and the centralized control device 55 are connected. And an output detection and control device comprising a current setter (61) connected to a current detector (59) installed in a circuit of the servo motor (40) via a comparator (60).
KR820004511A 1981-10-08 1982-10-07 Injection molding machine KR870000197B1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
JP16068181A JPS6157168B2 (en) 1981-10-08 1981-10-08
JP160681 1981-10-08

Publications (2)

Publication Number Publication Date
KR840001883A KR840001883A (en) 1984-06-07
KR870000197B1 true KR870000197B1 (en) 1987-02-16

Family

ID=15720160

Family Applications (1)

Application Number Title Priority Date Filing Date
KR820004511A KR870000197B1 (en) 1981-10-08 1982-10-07 Injection molding machine

Country Status (2)

Country Link
JP (1) JPS6157168B2 (en)
KR (1) KR870000197B1 (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0428532B2 (en) * 1983-06-03 1992-05-14 Nissei Plastics Ind Co
JPS6097821A (en) * 1983-11-02 1985-05-31 Fanuc Ltd Control device of injection molding machine
JPH0122135B2 (en) * 1983-11-24 1989-04-25 Fanuc Ltd
JPS60115419A (en) * 1983-11-28 1985-06-21 Fanuc Ltd Crank-type mold clamping mechanism in injection molding machine
JPH048210B2 (en) * 1983-12-13 1992-02-14 Fanuc Ltd
JPS60125618A (en) * 1983-12-13 1985-07-04 Fanuc Ltd Driving device of injection mechanism in injection molding machine
JPH0422683B2 (en) * 1983-12-22 1992-04-20 Nissei Plastics Ind Co
JPH0356527B2 (en) * 1983-12-28 1991-08-28
JPS60174623A (en) * 1984-02-21 1985-09-07 Toshiba Mach Co Ltd Injection molding machine
JPH0617038B2 (en) * 1984-06-06 1994-03-09 ファナック株式会社 Nozzle touch mechanism
JPS6124423A (en) * 1984-07-13 1986-02-03 Japan Steel Works Ltd:The Motorized injection device of injection molding machine
JPH0153617B2 (en) * 1984-07-30 1989-11-15 Nissei Plastics Ind Co
JPH0312445Y2 (en) * 1984-08-07 1991-03-25
JPH022408B2 (en) * 1984-09-04 1990-01-18 Fanuc Ltd
JPS6192453U (en) * 1984-11-22 1986-06-14
JPS61125826A (en) * 1984-11-24 1986-06-13 Fanuc Ltd Extruding machine
JPH0136589Y2 (en) * 1985-01-21 1989-11-07
JPH0246145B2 (en) * 1985-04-30 1990-10-15 Fanuc Ltd
JPH0442972B2 (en) * 1985-08-23 1992-07-15 Toyota Jido Shotsuki Seisakusho Kk
JPH0622841B2 (en) * 1986-06-23 1994-03-30 フアナツク株式会社 Simultaneous operation control system for weighing and mold opening
JPH0445865Y2 (en) * 1989-03-15 1992-10-28
JPH0344506Y2 (en) * 1989-08-29 1991-09-19
JP2542932B2 (en) * 1989-11-02 1996-10-09 ファナック株式会社 Crank type injection mechanism
JPH0737855Y2 (en) * 1991-06-26 1995-08-30 株式会社新潟鉄工所 Injection machine injection machine
JPH0673884B2 (en) * 1993-05-17 1994-09-21 ファナック株式会社 2-motor injection device
JPH0673883B2 (en) * 1993-05-17 1994-09-21 ファナック株式会社 Weighing completion detection method
JPH0742690Y2 (en) * 1993-07-23 1995-10-04 ファナック株式会社 Electric injection molding machine
JP2566542B2 (en) * 1994-12-12 1996-12-25 ファナック株式会社 Origin return device of injection molding machine driven by electric servo motor
JP2633226B2 (en) * 1996-03-05 1997-07-23 ファナック株式会社 Injection molding machine driven by electric servomotor
JP2820928B2 (en) * 1996-11-05 1998-11-05 ファナック株式会社 Injection molding machine driven by electric servomotor
JP2834444B2 (en) * 1997-01-06 1998-12-09 ファナック株式会社 Electric injection molding machine
KR100706500B1 (en) 2005-07-20 2007-04-10 엘에스전선 주식회사 Clamping system for injection molding machine
KR100644512B1 (en) 2005-09-01 2006-11-10 엘에스전선 주식회사 Clamping system
CN104002426B (en) * 2014-05-15 2016-10-05 华南理工大学 A kind of power sequential alternative approach of product batches manufacture

Also Published As

Publication number Publication date
JPS6157168B2 (en) 1986-12-05
JPS5862030A (en) 1983-04-13
KR840001883A (en) 1984-06-07

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