JPS61199920A - Mold clamping device of injection molder - Google Patents

Abstract

PURPOSE:To enable to engage or disengage a mold clamping rod being integral with a movable platen with or from a mold clamping ram by pivoting an engaging platen without stopping the rod once in the midway of a process such as the opening and closing of a mold or the like and consequently eliminate the time loss due to the stoppage once made by a structure wherein a wall part, in the center of which said mold clamping rod is inserted and against the inside surface of which the inside of a tappet provided at the rear end of the rod abuts, is formed at the tip of the mold clamping ram and further the engaging platen is provided in close vicinity to the outside of the pusher. CONSTITUTION:Because a pusher 11 provided at the rear end of a rod 9 is located between the wall part 10 at the tip of a mold clamping ram 8 and an engaging platen 13, the strong mold clamping force, which is developed by the forward movement of the mold clamping ram 8, is transmitted through the engaging platen 13 and the pusher 11 of the mold clamping ram 8 to the mold clamping rod. On the contrary, the strong mold opening force, which is developed by the backward movement of the mold clamping ram 8, is transmitted through the wall part 10 and the pusher 11 of the mold clamping ram 8 to the mold clamping rod 9. Because the engaging platen acts on the mold clamping rod 9 only when the mold clamping ram 8 is advanced by means of the hydraulic pressure in a mold clamping cylinder 6 and is in free state except the condition of the ram 8 just mentioned above, the engagement and disengagement between the mold clamping ram 8 and the mold clamping rod 9 can be realized by pivotally operating the engaging platen 13 without stopping the rod once in the midway of a process such as the opening and closing of a mold.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention provides an injection molding machine in which the mold can be opened and closed at high speed by disengaging the mold clamping ram from the mold clamping rod each time the mold is opened and closed. The present invention relates to a mold clamping device.

[Prior Art] This type of mold clamping device has a movable platen inside a mold clamping ram formed in a hollow shape, as disclosed in Japanese Patent Application Laid-open No. 49-54462 and Japanese Patent Application Laid-Open No. 49-67940. The connected mold clamping rod is inserted through the mold clamping rod, and the engagement or disengagement between the mold clamping ram and mold clamping rod is performed by both a locking plate rotatably provided inside the mold clamping ram and the rear end of the mold clamping rod. This is done by changing the position of splines formed in the

[Problems to be Solved by the Invention] In the above-mentioned conventional device, there is a rotatable part on the mold clamping ram side between the flange formed at the rear end of the mold clamping rod and the spline molded part on the side of the seven flange. When the mold is clamped, the clamping force is transmitted to the mold clamping rod via the locking plate and the subline forming part, and when the mold is strongly opened, the locking plate and the 7-lunge are The mold opening force is transmitted to the mold clamping rod through the mold opening force.

For this reason, the mold WUr1 using a moving cylinder provided elsewhere
1, since it is impossible to move the locking plate in and out of the moving spline molding part and 7 lunge,
At the end of mold clamping and strong mold opening, the mold clamping rod is temporarily stopped and the locking plate is moved in and out.

Although this temporary stop in the mold opening/closing process is a small amount of time in the cycle time L, it becomes a big time loss in a long molding operation, so it is necessary to shorten the molding time.
This is one problem when it comes to increasing or decreasing productivity.

[Means for Solving the Problems] This invention was conceived in view of the above circumstances, and its purpose is to temporarily remove the mold clamping rod integrated with the movable platen during the process such as opening and closing the mold. To provide a new mold clamping device that can engage or disengage a mold clamping ram by rotating a locking plate without stopping, and eliminates time loss due to temporary stoppage.

This invention for the above purpose forms a wall at the tip of a hollow mold clamping ram, a mold clamping rod connected to a movable platen is inserted through the center of the wall, and a spline at the rear end of the rod is formed on the inner surface of the wall. A locking plate, in which a spline is formed around a hole that abuts the molding part and allows the clamping rod to pass through, is rotatably provided in the mold clamping ram, close to the spline molding part.

[Function] In the above configuration, since the spline formed portion at the rear end of the rod is located between the wall of the mold clamping ram and the locking plate, the mold clamping force due to the forward movement of the mold clamping ram is applied to the locking plate. The mold opening force generated when the mold clamping ram retreats is transmitted to the mold clamping rod via the plate and the spline molding section, and conversely, the mold opening force generated when the mold clamping ram retreats is transmitted to the mold clamping rod through the wall section and the spline molding section. .

Therefore, the locking plate acts on the mold clamping rod only when the mold clamping ram moves forward, and is in a free state at other times, so the locking plate can be rotated without stopping during mold opening/closing. The mold clamping ram and the mold clamping rod can be engaged or disengaged by dynamic operation.

This will be explained in more detail with reference to illustrated embodiments.

[Example] In the figure, 1.2 is a pair of fixed plates provided on the machine base 3, 4.4 is a tie bar provided across the fixed plate 1.2, and the movable plate 5 can move forward and backward with respect to the fixed plate 2. Installation.

Reference numeral 6 denotes a mold clamping cylinder, which is fixed inward to the stationary platen 1 together with a plurality of moving cylinders 7.

This mold clamping cylinder 6 is equipped with a mold clamping ram 8 having a hollow portion long enough to allow one stroke of mold clamping, and inside the mold clamping ram 8 is the above-mentioned movable cylinder. ! A mold clamping rod 9 connected to the mold clamping ram 8 is inserted through a wall portion 10 integrally formed inside the tip of the mold clamping ram 8 so as to be freely movable in the axial direction.

The rear end of the mold clamping rod 9 has a spline molded portion 11 having a diameter larger than the rod diameter.
1 is brought into contact with the inner surface of the wall portion 10.

Furthermore, inside the mold clamping ram 8, the spline forming portion 11 is provided.
A locking plate 13, which has a spline on its outer periphery that engages with the spline formed in the molding part 1, and has a hole 12 through which the mold clamping bolt 9 is inserted, rotates close to the spline molding part 11. It can be set up freely.

This locking plate 13 transfers the hydraulic pressure attached to the fixed plate 1 to the cylinder 1.
It is connected to the rod 15 of No. 4 via an arm 16, and is rotated by this hydraulic cylinder 14.

In addition, 17 is movable! The piston rod 18 of the movable cylinder 7 connected to the lI5 is a mold that is attached separately to the fixed plate 2 and the movable plate 51115.

Next, the operation will be explained.

In the mold clamping state shown in FIG. 1, when hydraulic pressure is applied to the right chamber of the mold clamping cylinder 16 and the mold clamping ram 8 is pressurized to the left, the spline molded part 11 is in contact with the wall part 10. , the mold clamping rod 9 is pulled, and a strong mold opening occurs there.

Further, since no force is acting on the locking plate 13, the locking plate 13 can be rotated by the hydraulic cylinder. This lock! 113 can be rotated by the time the strong mold gap is completed, and the splines overlapped in the state shown in Fig. 2 due to the rotation, due to the positional movement of the spline on the locking plate side,
In the fitted state shown in figure w53, the spline molded part 1
1 is in a free state with respect to the locking plate 13.

Therefore, following the strong mold opening, when the moving cylinder 7°7 is hydraulically operated, the movable platen 5 is moved by the piston rod 17.17.
is continuously sent to the left together with the mold clamping rod 9, and high-speed mold opening occurs there.

In the process from high-speed mold opening to strong mold clamping, the moving cylinder 7 is first moved in the mold opening state shown by the chain line.
．． 7 to the right, the piston rod 17.17 transports the mold 11JI15 together with the mold clamping rod 9 toward the stationary platen 2.

Since the splines of the spline forming part 11 and the locking plate 1f13 are located at the positions shown in FIG. Rotate to original position. As a result, both splines are superposed again in the state shown in FIG. When pressure is applied to the right, the pressure is applied to the mold clamping rod 9 via the locking plate 13 and the spline molded part 11 at the rear end of the rod.
The mold clamping force is further transmitted to the movable platen 5.

As a result, mold clamping is performed following the high-speed mold m.

In the mold clamping device that opens and closes as described above, the opening/closing stroke can be adjusted according to the mold thickness of the mold 18 installed between the fixed platen 2 and the movable platen 5.

If the mold thickness is smaller than the standard, the moving cylinder 7.7 moves the movable platen 5 forward toward the fixed platen 2 until the divided molds come into contact with each other. As a result of this movement, the mold clamping ram 8 is pulled out by the spline forming part 11 in contact with the inner surface of the wall part 10 until it stops at the mold clamping point 9, and the mold clamping position is automatically set there. Ru.

If the mold thickness is larger than the standard, the locking plate 13 is used to prevent the mold clamping rod 9 from passing through the mold clamping cylinder, and the moving cylinder 7.7 is used to move the mold clamping rod 9 together with the movable platen 5 to the mold thickness. Move it backwards to the appropriate position. As a result, the mold clamping ram 8 is also pressed through the locking plate 13 and moves backward.
The mold clamping position is set there.

[Effects of the Invention] In this invention having the above configuration, the locking plate can be rotated when the mold is opened or while the movable plate is moving to engage or disengage the mold clamping ram and the mold clamping rod. Therefore, the process can be carried out continuously without stopping once when the mold is opened and closed, and the cycle time can be shortened.

In addition, since the mold thickness can be adjusted by moving the mold clamping ram using the mold clamping rod, no special equipment or means are required for mold thickness adjustment, reducing the time required for mold replacement and improving efficiency. I can do it.

[Brief explanation of the drawing]

The drawings schematically show one embodiment of the mold clamping device for an injection molding machine according to the present invention, and FIG. 1 is a vertical sectional side view of the main part, and FIG. 2 is a diagram showing the relationship between the mold clamping ram and the mold clamping cylinder. FIG. 3 is a longitudinal sectional front view of the essential parts in the engaged state, and FIG. 3 is a longitudinal sectional front view of the essential parts in the disengaged state. 1.2... Fixed plate 5... Movable plate 6... Mold clamping cylinder 7... Movable cylinder 8... Mold clamping ram 9... Mold clamping rod 10... Wall part
11... Spline molded part 12... Hole
13...Applicant for locked type patent Nissei Jushi Kogyo Co., Ltd. Procedure Ne F111 Mold clamping device 2, Claims: A mold clamping cylinder fixed to a machine base has a mold clamping ram formed hollow, and a locking plate having a through hole inside the tip of each mold clamping ram is rotatable. The mold clamping rod connected to the clamping ram is inserted into the mold clamping ram, and the engagement and disengagement between the mold clamping ram and the mold clamping rod is controlled between the inner layer of the locking plate and the outside of the rear end of the rod. In a mold clamping device using a plurality of axially removable protrusions formed around the periphery and a recess, a wall is formed at the tip of the mold clamping ram, and the mold clamping [ A one-output molding machine, characterized in that the rod is inserted through the rod and the inner side of the protrusion at the rear end of the rod is brought into contact with the inner surface of the wall, and the locking plate is provided adjacent to the outer side of the protrusion. Mold clamping device. 3. Detailed Description of the Invention [Field of Industrial Application] This invention provides an injection molding machine in which the overall length of the clamping cylinder is shortened by engaging and disengaging the clamping ram with the clamping rod each time the mold is opened and closed. The present invention relates to a mold clamping device. [Prior Art] This type of mold clamping device has a movable platen inside a mold clamping ram formed in a hollow shape, as disclosed in Japanese Patent Laid-Open No. 49-54462 and Japanese Patent Laid-Open No. 49-67940. A connected mold clamping rod is inserted through the mold clamping rod, and the engagement and disengagement between the mold clamping ram and mold clamping rod is achieved by a stopper rotatably provided inside the mold clamping ram and a stopper formed on both the rear end of the mold clamping rod. This is done using male and female splines. [Problems to be Solved by the Invention] In the above-mentioned conventional device, there is
A rotatable locking plate is positioned on the mold clamping ram side, and when the mold is clamped, the mold clamping force is transmitted to the mold clamping rod via the above-mentioned double male splines, and when the mold is strongly opened, the clamping force is transmitted to the mold clamping rod via the stopper and flange. The mold opening force is transmitted to the mold clamping rod. For this reason, when opening and closing the mold using another moving cylinder, it is impossible to move the stopper in and out of the moving male spline or flange. The tightening rod is temporarily stopped and the stopper is rotated. This temporary stop during the mold opening/closing process results in a large time loss in long-term molding operations, and is a problem in shortening molding time and improving productivity. [Means for Solving the Problems] This invention was conceived in view of the above circumstances, and its purpose is to temporarily remove the mold clamping rod integrated with the movable platen during the process such as opening and closing the mold. An object of the present invention is to provide a new mold clamping device which can engage or disengage a mold clamping ram by rotating a locking plate without stopping, and which reduces the time taken by stopping by 1. According to the above-mentioned object, the present invention has a clamping ram of a mold clamping cylinder fixed on a machine base which is formed hollow, and a through hole is provided inside the tip of the mold clamping ram. I! With A rotatably installed, insert the mold clamping rod connected to the movable plate into the mold clamping ram,
and a plurality of protrusions and recesses that are formed on the inner periphery of the locking plate and the outer periphery of the rear end of the rod and that are freely engageable and disengageable in the axial direction, and engage and release the clamping ram and the mold clamping rod. In the mold clamping device, a wall is formed at the tip of the mold clamping ram, the mold clamping rod is inserted through the center of the wall, and the inner side of the protrusion at the rear end of the rod is brought into contact with the inner surface of the wall. In addition, the locking plate is provided close to the outside of the protrusion. [Function] In the above structure, the protrusion at the rear end of the 0 rad is located between the wall at the tip of the mold clamping ram and the locking plate, so a strong mold clamping force is generated by the forward movement of the mold clamping ram. is transmitted to the mold clamping rod via the locking plate and the protrusions of the mold clamping ram, and conversely, the strong mold opening force generated when the mold clamping ram retreats is transmitted to the mold clamping rod through the above-mentioned wall and the protrusions of the mold clamping ram. is transmitted to the mold clamping rod via. Further, when the movable cylinder 71WA performs a 4-speed mold closing, the mold clamping ram also moves in the mold closing direction due to the contact between the protrusion at the rear end of the mold clamping rod and the wall at the tip of the mold clamping ram. Therefore, the locking plate acts on the mold clamping rod only when the mold clamping ram moves forward due to the hydraulic pressure in the mold clamping cylinder, and is in a free state at other times, so there is no need to stop it once during mold opening/closing. The locking plate can be rotated to engage or disengage the mold clamping ram and the mold clamping rod. This will be explained in more detail with reference to illustrated embodiments. [Example] In the figure, 1.2 is a pair of fixed plates provided on the machine base 3, 4.4 is a tie bar provided across the fixed plate 1.2, and the movable plate 5 can move forward and backward with respect to the fixed plate 2. It is installed on. Reference numeral 6 denotes a mold clamping cylinder, which is fixed inward to the stationary platen 1 together with a plurality of moving cylinders 7. The mold clamping cylinder 6 is equipped with a mold clamping ram 8 having a hollow portion large enough to allow the stroke of the mold clamping rod. The rod 9 has a wall portion 10 integrally formed inside the tip of the mold clamping ram 8.
It is inserted so that it can be freely moved in the axial direction. Four protrusions 11 and recesses 11a are radially formed at equal intervals on the outer periphery of the rear end of the mold clamping rod 9, and the protrusions 11 make the rear end have a diameter larger than the rod diameter. It has become. Inside the mold clamping ram 8, a recess 12a corresponding to the protrusion 11 and a protrusion 12 corresponding to the recess 11a are formed between the inner layers, and the rear end of the mold clamping rod 9 is A locking plate 13 having a hole in the center for allowing insertion is provided close to the outside of the protrusion 11 so as to be freely rotatable. This locking plate 13 is connected via an arm 16 to a rod 15 of a hydraulic cylinder 14 rotatably mounted diagonally below the wall portion 10, and is rotated by this hydraulic cylinder 14. In addition, it is movable! lI5 is connected to the piston rod 17 of the moving cylinder 7 connected to the mold clamping cylinder 6, and the mold 1
Reference numeral 8 indicates that the fixed platen 2 and the movable platen 5 are installed separately. Next, the operation will be explained. In the mold clamping state shown in FIG. 1, when hydraulic pressure is applied to the right chamber of the clamping cylinder 6 and pressure is applied to the mold clamping ram 8 to the left, the inside of the protrusion 11 comes into contact with the wall 10. Then, the mold clamping rod 9 is pulled, and a strong mold gap is created there. In addition, since no force is acting on the locking plate 13, the locking plate 13 can be rotated by the hydraulic cylinder 14 in parallel with the strong die forming process. Therefore, locking plate 1
The rotation of 3 is completed by the time the strong mold gap is completed, and the protrusions 11 and 12, which have overlapped in the state shown in FIG. As shown in FIG. 3, the projections 11 and the recesses 12a overlap and mold clamping
The rear end portion is free in the axial direction with respect to the locking plate 13. Therefore, when hydraulic pressure is supplied to the right chamber of the moving cylinder 7°7 following the strong mold opening, the movable platen 5 is moved to the left together with the mold clamping rod 9 by the piston rod 17.17, and the high speed mold opening is performed there. arise. The process from high-speed mold opening to strong mold clamping involves first supplying hydraulic pressure to the left chamber of the moving cylinder 7゜7 to move the piston rod 17゜17 to the right in the mold opening state shown by the chain line. , move the movable platen 5 together with the mold clamping rod 9 toward the fixed platen 2. Since the protrusions 11 at the rear end of the mold clamping rod 9 and the protrusions 12 of the locking plate 13 are located at the positions shown in FIG. 13 and comes into contact with the wall 10, further pulling the mold clamping ram 8 and moving in the mold closing direction. In parallel with this movement, the locking plate 13 is rotated to its original position by a hydraulic cylinder. As a result, both protrusions 11 and 12 overlap again in the state shown in FIG. When the clamping ram 8 is pressurized to the right, the strong mold clamping force due to the pressurization is applied to the locking plate 13.
This is transmitted to the mold clamping rod 9 via the protrusions 11 and 12 of the mold clamping rod 9, and then to the movable platen 5. As a result, strong mold clamping is performed following high-speed mold closing. In the mold clamping device that operates 1Ffl II as described above, the movable stroke of the mold clamping ram 8 allows the clamping ram 8 to move between the fixed position 12 and the movable position 12. 1
The opening/closing stroke can be adjusted depending on the thickness of the mold 18 installed between the mold 18 and the mold 18. If the mold thickness of the mold to be used next is smaller than the mold thickness of the mold used last time, the movable cylinder 7.7 is fixed by the moving cylinder 7.7 until the divided molds touch each other! Avoid moving forward in the direction of 82. As a result of this movement, the mold clamping ram 8 is pulled out via the mold clamping rod 9 until it stops by the protrusion 11 in contact with the inner surface of the wall portion 10, and the mold clamping position is automatically set there. On the other hand, if the thickness of the mold is too large, hydraulic pressure is supplied to the right chamber of the mold clamping cylinder 6 before the mold is installed, and the mold clamping ram 8 is moved to the retraction limit, and then the u1 mold is installed. Clamp the mold in the same way as above. This sets the mold clamping position. [Effects of the Invention] In this invention having the above configuration, the locking plate is rotated in parallel with high-speed mold closing or forced mold opening to engage and disengage the mold clamping ram and mold clamping rod. As a result, the process can be carried out continuously without -H stop J when opening and closing the mold, making it unnecessary to control the stop position, making the operation smoother and shortening the cycle time. Also, during high-speed mold closing, the protrusion at the rear end of the mold clamping rod comes into contact with the wall just before the mold closes, and the mold clamping ram is pulled, so it is possible! 71! It acts as a brake against the movement of I and absorbs the inertial force of the movable platen, making it easier to perform slowdown v control. Furthermore, since the mold thickness can be adjusted by moving the mold clamping ram, no special equipment or means is required for mold thickness adjustment, and the time required for mold replacement can also be shortened and efficiency improved. 4. Brief description of the drawings The drawings schematically show one embodiment of the mold clamping @ position of the injection molding machine according to the present invention. Fig. 1 is a vertical side view of the main part, and Fig. 2 shows the mold clamping ram. FIG. 3 is a longitudinal sectional front view of the main part in a state in which the mold clamping rod is engaged, and FIG. 3 is a longitudinal sectional front view of the main part in a state in which the engagement is released. 1.2... Fixed plate 5... Movable plate 6... Mold clamping cylinder 7... Movable cylinder 8... Mold clamping ram 9... Mold clamping rod 10... Wall part
11, 12... protrusions 11a, 12a... recess 13... locking plate

Claims (1)

[Scope of Claims] The mold clamping ram of the mold clamping cylinder fixed on the machine base is formed hollow, and a locking plate having a through hole is rotatably provided inside the mold clamping ram, and the mold clamping ram is A mold clamping device in which a mold clamping rod connected to a movable plate is inserted, and the mold clamping ram and the mold clamping rod are engaged or disengaged by changing the position of splines formed on the locking plate and the rear end of the rod. A wall is formed inside the mold clamping ram, the mold clamping rod is inserted through the center of the wall, and the spline molded part at the rear end of the rod is brought into contact with the inner surface of the wall, and the spline molded part A mold clamping device for an injection molding machine, characterized in that the locking plate is provided in a mold clamping ram in close proximity to.