JP2000289069A - Clamping mechanism of injection molding machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress inclination of a fixed platen in a clamping mechanism of an injection molding machine. SOLUTION: In a clamping mechanism of an injection molding machine on the base frame 3 of which a fixed platen 4 is provided, a rib 10 is provided on the lower part of the face on the nozzle touch side of the fixed platen 4 and a support 30 provided on the base frame 3 is connected with the rib 10 to support the fixed platen 4 by this connection. Against stress generated by fitting the mold in the direction wherein the fixed platen 4 is inclined to the movable platen side, a clamping mechanism is constituted in such a way that an acting force balancing this stress is applied on the fixed platen 4 to suppress the inclination of the fixed platen 4.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a mold clamping mechanism for an injection molding machine.

[0002]

2. Description of the Related Art FIG. 7 is a schematic diagram for explaining the structure of a conventional injection molding machine 1. The injection molding machine 1 is provided on a base frame 3 so as to be opposed to the mold clamping mechanism 2 and the injection device 9. The mold clamping mechanism 2 includes a fixed platen 4, a moving platen 5, and a rear platen 6 along a mold clamping axis. The fixed platen 4 and the rear platen 6 are connected by a tie bar 7, and the movable platen 5 can be moved to the tie bar 7. Attach to A space between the fixed platen 4 and the movable platen 5 is a mold clamping space, and a mold (not shown) is attached. The moving platen 5 is coupled to the rear platen 6 by a drive mechanism 8 such as a toggle link.

The injection device 9 includes a mechanical section 91 and a cylinder assembly 92, and a tip of the cylinder assembly 92 is provided with a nozzle touch 93 for injecting resin.

The base frame 3 is composed of a combination of two main pipes 31 and 32 (upper main pipe 31 and lower main pipe 32), columns 33 to 36, and horizontal columns (not shown). The fixed platen 4 is installed on the main pipe 31 at a position above the column 34. The strut 34 supports the weight of the fixed platen 4.

[0005] The fixed platen 4 is used alone as the upper main pipe 3.
1 and 32 and the support 34, the fixed platen 4 is moved by gravity to the upper main pipes 31 and 32.
A vertical load is applied to the support 34 and the support 34, and the support 34 and the upper main pipes 31 and 32 arranged mainly below the fixed platen 4 are deformed in the vertical direction.
When the base frame 3 is deformed in the vertical direction, the parallel state between the fixed platen 4 and the moving platen 5 is substantially maintained, so that there is no particular problem in driving the injection molding machine such as moving the moving platen 5. No.

However, when the mold is mounted on the fixed platen 4, the fixed platen 4 may be slightly inclined toward the movable platen 5 to hinder the movement of the movable platen 5.

FIG. 8 is a schematic diagram for explaining a state in which a mold is mounted on the fixed platen 4 in the conventional injection molding machine 1. As shown in FIG. 8, when the mold 20 is attached to the fixed platen 4 and the movable platen 5 of the conventional injection molding machine 1, the fixed platen 4 is slightly inclined toward the movable platen 5 due to the weight of the mold 20. Due to the inclination of the fixed platen 4, a positional relationship occurs between the mold attached to the fixed platen 4 and the mold attached to the position platen 5. This displacement causes a portion where the guide portions of both molds come into strong contact with the local portions, which may hinder slide movement and engagement when the molds are combined.

[0008] Further, the fixed platen 4 with the mold opened.
When the mold is tilted, the guide pin strongly contacts the entrance of the mold when closing the mold, and in some cases, it may be difficult to align the mold. Especially for thick molds
The fixed platen will tilt greatly.

In the structure for fixing the fixed platen provided in the mold clamping mechanism of the conventional injection molding machine, the fixed platen is simply fixed on the two columns on the base frame. Cannot be suppressed.

[0010]

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to solve the conventional problems and suppress the inclination of a fixed platen in a mold clamping mechanism of an injection molding machine.

[0011]

SUMMARY OF THE INVENTION According to the present invention, a force generated by mounting a mold in a direction in which a stationary platen is inclined toward a moving platen is applied to the stationary platen with an acting force balanced with the stress. By configuring a mold clamping mechanism, the inclination of the fixed platen is suppressed.

A mold clamping mechanism for an injection molding machine according to the present invention is a mold clamping mechanism for an injection molding machine having a fixed platen provided on a base frame of the injection molding machine, wherein a rib is provided below a surface of the fixed platen on the nozzle touch side. Provided, the support and the rib provided on the base frame are connected, and the connection supports the fixed platen.

The fixed platen has a surface on the moving platen side and a surface on the nozzle touch side in the direction of the mold clamping axis. A mold is attached to the surface on the moving platen side, and is arranged to face the mold attached to the moving platen side. The rib is provided at a lower portion on the surface on the nozzle touch side opposite to the surface on the moving platen side. It is connected to the upper end of a column disposed below the fixed platen.

The supporting column supports the fixed platen by being connected to the rib, and the tip portion is arranged at a position at least in contact with the lower end portion of the rib. It should be noted that the post connected to the rib may be a post dedicatedly provided for fixing the rib to the main plate, or may also be a post connecting the upper and lower main pipes. Note that, in the base frame portion, the portion to which the rib is connected may be a main pipe connected to or integrally formed with the support in addition to the above-described support.

When the mold is attached to the fixed platen in the mold clamping mechanism of the injection molding machine of the present invention, a stress is generated in the fixed platen to tilt the fixed platen toward the moving platen, and the stress is applied to the main plate via the rib. It is conveyed to the pillar. Since the column is fixed to the main plate, the column generates an acting force balanced with the stress on the rib. Due to the balance between the stress and the acting force of the rib, the fixed platen maintains a vertical posture on the base frame without tilting toward the movable platen.

[0016] Thereby, the mold plate parallelism between the fixed platen and the movable platen can be maintained with high precision, and a great effect is obtained in precision molding that requires high parallelism when opening and closing the mold. Can be. The fixed platen itself can be fixed to the base frame by connecting the lower portions at both ends of the fixed platen to two upper main pipes as in the related art.

The rib provided in the mold clamping mechanism of the present invention may be formed on the center line of the fixed platen toward the nozzle touch side. In this configuration,
The column connected to the rib is provided on the nozzle touch side of the fixed platen on the center line of the fixed platen. Due to the arrangement of the ribs and the columns, the fixed platen is installed on the three columns arranged in a triangle. Therefore, while the conventional support structure of the fixed platen is a linear structure with two columns, the support structure of the present invention is a three-dimensional structure with three columns arranged in a triangle. In addition, the inclination of the fixed platen due to the mounting of the mold can be suppressed.

The rib provided in the mold clamping mechanism of the present invention is
It is possible to adopt a configuration in which two are formed on the end side of the fixed platen toward the nozzle touch side. In the case of this configuration, the post connected to the rib is provided at a position shifted from the end position of the fixed platen toward the nozzle touch side. Due to the arrangement of the ribs and the columns, the fixed platen is installed on the four columns arranged in a rectangular shape. Therefore, since the support structure of this configuration is three-dimensional with the four columns arranged in a rectangular shape, the inclination of the fixed platen due to the mounting of the mold can be suppressed. For the connection between the rib and the column and the connection between the fixed platen and the main pipe, well-known connection means such as bolting and welding can be applied.

[0019]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is an overall view of an injection molding machine for explaining a mold clamping mechanism of the injection molding machine of the present invention, and FIGS. 2 and 3 are perspective views of the mold clamping mechanism of the injection molding machine of the present invention. 4, 5, and 6 are a side view, a front view, and a cross-sectional view of a mold clamping mechanism of the injection molding machine of the present invention. Note that the injection molding machine shown in FIG. 1 is a schematic diagram showing a general configuration, and the configuration of the injection molding machine is well-known, so that detailed description thereof will be omitted here.

In FIG. 1, an injection molding machine 1 has a mold clamping mechanism 2 on a base frame 3 similarly to a conventional injection molding machine.
The injection device 9 is provided, the mold is clamped between the fixed platen 4 and the movable platen 5 constituting the mold clamping device 2, and the cylinder assembly 92 of the injection device 9 is slid to fix the nozzle touch 93 at the tip. The molding is performed by pressing the resin supplied from the hopper against the center hole of the platen 4 and injecting the resin from the nozzle touch 93 through the cylinder assembly 92 to between the molds (not shown).

The mold clamping mechanism 2 includes a fixed platen 4, a moving platen 5, and a rear platen 6 along a mold clamping axis.
The fixed platen 4 and the rear platen 6 are connected by a tie bar 7, and the movable platen 5 is movably mounted on the tie bar 7. A space between the fixed platen 4 and the movable platen 5 forms a mold clamping space, and a mold (not shown) is attached. The moving platen 5 is coupled to the rear platen 6 by a drive mechanism 8 such as a toggle link.

The base frame 3 includes two upper main pipes 31 and two lower main pipes 32 and support columns 30 and 3.
3 to 36 and a horizontal column (not shown). The column 34 is arranged below the fixed platen 4 to support the main body of the fixed platen 4, and the column 30 is arranged below the rib 10 provided on the fixed platen 4 to support the rib 10. The columns 33, 35, and 36 are arranged at predetermined positions according to the devices and mechanisms provided on the base frame 3.

FIGS. 2 and 3 show a structure for supporting a part of a fixed platen of a mold clamping mechanism of the injection molding machine of the present invention, as viewed from a nozzle touch side (not shown). Note that FIG.
Shows a state in which a part of the components shown in FIG. 2 is separated. 2 and 3, the fixed platen 4 includes a rib 10 in a lower portion on a nozzle touch side (not shown). The ribs 10 shown in FIGS. 2 and 3 have legs inclined downward from the middle part of the fixed platen 4 and toward the nozzle touch side, and have a bottom surface parallel to the upper surface of the base frame 3.

The illustrated rib 10 has two legs, and both legs are arranged on both sides of an opening 41 formed to guide a nozzle touch (not shown) to a central hole of the fixed platen 4. .

The base frame 3 has upper main pipes 31a, 32b arranged in parallel along the mold clamping axis as well as lower main pipes 32a, 32b arranged in parallel along the mold clamping axis.
31b, and columns 34a and 34b for connecting the upper and lower main pipes are provided substantially at positions below both ends of the fixed platen 4. Further, a column 30 for supporting the rib 10 is provided below the rib 10 leg. The support 30 is disposed on the nozzle touch side (not shown) of the fixed platen 4 on the center line of the fixed platen 4. The support 34
b is not shown in FIG. 2 because it is located behind the column 30.

The parallel main pipes are connected by horizontal columns. In FIG. 2, only the horizontal column 37 connecting the lower main pipe 32a and the lower main pipe 32b is shown, and the horizontal column connecting the upper main pipe 31a and the upper main pipe 31b is not shown.

The fixed platen 4 is connected to the upper main pipe 31a and the upper main pipe 31b by the connecting plate 1.
1, so that the flatness of the connecting surface and the connecting strength can be increased, and the operability of the connecting operation can be improved.

The plate 12 is arranged below the lower main pipe 32a, the lower main pipe 32b, and the column 30 to connect the column 30 to the lower main pipes 32a, 32b. Can be improved in flatness.

FIG. 4 is a side view of the fixed platen 4 and columns 30 and 34 of the mold clamping mechanism viewed from a direction parallel to the mold clamping axis of the injection molding machine. In FIG. 4, the right direction is the nozzle touch side, and the left direction is the moving platen side. The front view shown in FIG. 5 is a view of the fixed platen 4 and the columns 30 and 34 of the mold clamping mechanism as viewed from the nozzle touch side of the injection molding machine.

The fixed platen 4 has a rib 1 on the nozzle touch side.
0, and a column 30 below the rib 10.
The rib 10 and the support 30 can be connected directly or
Connect through. For connection, known connection means such as bolting and welding can be applied. In addition, a support post 34 is provided at a position below the fixed platen 4, and like the rib 10,
The connection is made directly or via the plate 11. In addition,
A tie bar hole 42 for fixing the tie bar through the tie bar 4 is formed in the fixed platen 4.

FIG. 6 is a cross-sectional view as seen from the position of AA in FIG. In FIG. 6, the upper main pipe 3
One end of the fixed platen 4 is located above the support 34a with the 1a and the plate 11 interposed therebetween, and the other end of the fixed platen 4 is located above the support 34b with the upper main pipe 31b and the plate 11 interposed therebetween. To position. The bottom surface of the rib 11 of the fixed platen 4 is located above the column 30 with the plate 11 interposed therebetween.

[0032]

As described above, according to the present invention,
The inclination of the fixed platen can be suppressed in the mold clamping mechanism of the injection molding machine.

[0033]

[Brief description of the drawings]

FIG. 1 is an overall view of an injection molding machine for explaining a mold clamping mechanism of the injection molding machine of the present invention.

FIG. 2 is a perspective view of a mold clamping mechanism of the injection molding machine of the present invention.

FIG. 3 is a perspective view of a mold clamping mechanism of the injection molding machine of the present invention.

FIG. 4 is a side view of a mold clamping mechanism of the injection molding machine according to the present invention.

FIG. 5 is a front view of a mold clamping mechanism of the injection molding machine according to the present invention.

FIG. 6 is a sectional view of a mold clamping mechanism of the injection molding machine of the present invention.

FIG. 7 is a schematic diagram for explaining a configuration of a conventional injection molding machine.

FIG. 8 is a schematic diagram for explaining a state in which a mold is attached to a fixed platen 4 in a conventional injection molding machine.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Injection molding machine 2 Mold clamping mechanism 3 Base frame 4 Fixed platen 5 Moving platen 6 Rear platen 7 Tie bar 8 Drive mechanism 9 Injection device 10 Rib 11,12 Plate 20 Die 30,33,34,35,36 Column 31 Upper main pipe 32 Lower main pipe 37 Horizontal column 41 Opening 42 Tie bar hole 91 Machine part 92 Cylinder assembly 93 Nozzle touch

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[Procedure amendment]

[Submission date] February 7, 2000 (2000.2.7)

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Claims

[Correction method] Change

[Correction contents]

[Claims]

3. A flat plate is arranged above and below the base frame, and the flat plate on the upper surface is
The fixed platen and the rib are placed, and the rib is connected to a support provided below the rib via a flat plate on the upper surface, and the support is connected to the upper flat plate and the lower flat plate. The mold clamping mechanism for an injection molding machine according to claim 1, wherein the mold clamping mechanism is tightly fitted between the two. ────────────────────────────────────────────────── ───

[Procedure amendment]

[Submission date] June 2, 2000 (2006.2)

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Claim 1

[Correction method] Change

[Correction contents]

[Procedure amendment 2]

[Document name to be amended] Statement

[Correction target item name] Claim 2

[Correction method] Change

[Correction contents]

Claims (1)

[Claims] 1. A mold clamping mechanism for an injection molding machine having a fixed platen provided on a base frame of the injection molding machine, wherein a rib is provided below a surface of the fixed platen on a nozzle touch side,
A mold clamping mechanism for an injection molding machine, wherein a support provided on the base frame and the rib are connected to support the fixed platen.