WO1991008887A1

WO1991008887A1 - Press used as compression molding machine

Info

Publication number: WO1991008887A1
Application number: PCT/JP1990/001664
Authority: WO
Inventors: Kohji Hayakawa
Original assignee: Kabushiki Kaisha Komatsu Seisakusho
Priority date: 1989-12-20
Filing date: 1990-12-20
Publication date: 1991-06-27
Also published as: AU6951791A

Abstract

A press used as a compression molding machine having as its object a capability of facilitating matching between a top force and a bottom force, improving the matching accuracy and providing high precision mold clamping without being affected by distortions of components due to various causes. The press comprises a plurality of guide rods (2) erected from the bed (1a) of a main body of the press in parallel to one another; slides (4) vertically movable by means of a slide driving means slidably supported by the respective guide rods; a plurality of hydraulic cylinders (8) each having a piston rod (8b) formed in a slide and projecting downwardly; a rocking member (10) supported in the horizontal direction by the piston rods of the hydraulic cylinders through links (9); a top force (11) fastened to the undersurface of the rocking member; and a bottom force (12) placed on the bed.

Description

Specification

Press machine used as compression molding machine

TECHNICAL FIELD OF THE INVENTION

The present invention relates to a press machine, and particularly to a press machine used as a resin compression molding machine.

BACKGROUND OF THE INVENTION

Conventionally, as an example of a press machine used as a resin compression molding machine, for example, as shown in Fig. 1, a press machine is provided at the top of a press body a to be vertically movable. The upper mold c is provided on the slide b side, and the lower mold e is provided on the bead d provided at the lower part of the press body a. A guide pin f that guides the upper mold c descending with the slide b and guides the upper mold c and the lower mold _e is provided between _e. Commonly used. '

In the above-mentioned conventional press apparatus, the above-mentioned conventional press apparatus is subject to heat distortion caused by gas, load, temperature difference, etc. caused by machining accuracy of the slide guide. Therefore, the positional accuracy of the upper mold c and the lower mold d in the vicinity and at the time of separation from each other does not always reach a satisfactory level, which adversely affects the accuracy of the product.

In particular, when the press unit becomes large, the machining error becomes large, so that the distortion of the slide guide part also becomes large, and it takes a large amount of time to suppress this. In addition to the need for extra measures, the equipment becomes expensive, and even if the measures are taken, the wear will increase if the guide parts wear out during long-term use. , Both types c, The reproducibility of the positional relationship accuracy between e exceeds the practically acceptable value, and it is very uneconomical, such as shortening the practical life of the press device.

In the case where the upper mold c and the lower mold e are aligned with each other by the alignment pin f, when the upper mold c and the lower mold e are close to each other, the mold pin f As a result, the type-matching pin f is bent as shown in Fig. 2 and the two types ce are damaged, or the service life is shortened at an early stage. There was a malfunction. —

Further, as a press machine of this kind, for example, a press machine described in Japanese Patent Application Laid-Open No. Sho 61-2833497 is known.

In this press machine, as shown in Fig. 2, a screw shaft c was penetrated through a hydraulic cylinder b installed in a bed a as shown in Fig. 3. It has a screw d and the upper end of the screw shaft c is rotatably engaged with a slide f on which the upper die e is mounted.

A driving device g for rotating the screw shaft c is provided at the lower end side of the screw shaft c, and is provided on the ball h together with the lowering of the slide f. After the upper mold e is matched with the lower mold i, the hydraulic pressure is supplied to the hydraulic cylinder b so that the upper and lower molds e and i are clamped by hydraulic pressure. The hydraulic cylinder b has a large diameter and a small stroke: a small amount of oil allows a more powerful mold clamping, and Go to a On the other hand, the mold can be clamped by lowering the slide f while maintaining a high degree of parallelism, which has the effect of obtaining a highly accurate product.

In the conventional press described above, since the screw axial force is engaged on the slide side and the bead side, the press due to the molding reaction force and temperature difference The engagement parts are liable to be displaced by the influence of the distortion of the main body, and as a result, there is a problem that the stability is lacking.

In addition, since a structure that penetrates the thread inside the piston is adopted, it is necessary to stop the piston from turning, which increases the complexity of the structure and the thread. Because the shaft engaging part is independent of the press body and the guide part for guiding the vertical movement of the slide is provided outside the engaging part, the distance between the guide parts is large. There are also problems such as increased distortion.

In addition, the drive provided on the hydraulic cylinder is loaded with the entire weight of the slide and the engaging part, so when synchronizing with the servo valve, synchronization accuracy is reduced. There were also problems such as adverse effects o

Summary of the Invention

The present invention has been made in view of the above circumstances, and a first object of the present invention is to facilitate the alignment operation between the upper mold and the lower mold and to achieve alignment. In order to improve accuracy, we provide a press machine that is used as a compression molding machine that has an automatic alignment function on at least one of the upper and lower dies. Things It is.

Further, the second object of the present invention is to be influenced by processing errors and play of the slide guides, distortions due to a temperature difference, and distortions due to a mold clamping reaction force. An object of the present invention is to provide a press machine to be used as a compression molding machine that enables highly accurate mold clamping.

In order to achieve the first object, according to the first aspect of the present invention,

A press machine used as a compression molding machine.

(a) a plurality of guide rods standing parallel to each other on the press machine body,

(b) a slide slidably supported by each of the guide rods and vertically moved along the guide rods by slide drive means;

(c) a plurality of hydraulic cylinders formed in the slide, each having a piston rod projecting downward from the lower surface of the slide,

(d) A link is made to the piston rod of the hydraulic cylinder so that the parallelism with respect to the upper surface of the bed can be corrected and can be swung in the horizontal direction. A swinging member supported and suspended through the

(e) an upper die fixed to the lower surface of the oscillating member, and

(f) a lower mold placed on the bed;

A press machine having the following is provided. According to a second aspect of the present invention, there is provided a press machine used as the compression molding machine according to the first aspect, wherein the swing member is parallel to an upper surface of a bed. For this purpose, the projecting length of each piston rod of the hydraulic cylinder is controlled based on a signal from a position detector for detecting the position of the slide. A press machine characterized by the following is provided.

According to a third aspect of the present invention, there is provided a press machine used as the compression molding machine according to the first aspect, in order to achieve the second object. Thus, a plurality of guide rods for supporting the slide are provided at a lower portion of each of the plurality of guide rods, and are provided in a plurality of screw holes formed at appropriate positions in the blade. It is characterized in that it is engaged with a rotation drive device that synchronously rotates these guide rods at the upper end of each. Press equipment to be provided.

According to a fourth aspect of the present invention, there is provided a press machine used as the compression molding machine according to the third aspect, wherein the slide is locked at a mold clamping position. A press machine further provided with a locking device is provided.

The present invention having the above-described embodiments has the following functions and effects.

Even if there is an error in the parallelism of the slide lowered by the slide drive means, the parallelism correction by the hydraulic cylinder and the alignment function of the moving member will lower the error. We have provided a press device that can perform mold clamping without applying excessive force to the guides of the mold. It is provided.

Furthermore, after the slide lowered to the bottom dead center by the slide drive mechanism is locked in the mold clamping position by the engagement device, the upper mold is moved by the hydraulic cylinder. The swinging member attached to can be further lowered to perform mold clamping.

Therefore, the configuration is simpler than the conventional one in which the slide guide is engaged with the screw shaft independently, and the distance between the slide guides is small. As a result, high-precision molding is possible without being affected by machining errors, backlash, thermal distortion, etc.In addition, mechanically near the bottom dead center of the slide After locking, the die is dies with a small-sized hydraulic cylinder, so that the amount of oil in the hydraulic cylinder can be small and the oil in the cylinder can be small. The ability to reduce poor response due to compression can be achieved, and the mold can be clamped with high accuracy.

In addition, by providing a rotary drive on the upper part of the guide rod, the rotary drive can be easily attached and detached from the press body, so that maintenance and management are easy and Since the joint device is positioned by the guide rod, it can be securely locked.However, since the mold clamping reaction does not work directly on the guide rod, the guide rod is It not only has the strength to support _movable parts such as slides, but also can greatly reduce the weight of the parts that support the guide rods. become able to .

The above and other objects, aspects, and advantages of the present invention will be described in detail with reference to preferred embodiments that are consistent with the principles of the present invention. It will be apparent to a person of skill in the art by describing in connection with the following description and accompanying drawings that are included.

BRIEF DESCRIPTION OF THE FIGURES

FIG. 1 is a schematic front view showing a conventional example.

FIG. 2 is a schematic front view showing another conventional example, FIG. 3 is a sectional view of a main part of the conventional example shown in FIG. 2, and FIG. 4 is a first example of the present invention. FIG. 2 is a schematic front view, partially cut away, of a specific example.

FIG. 5 is a partially cut-away schematic front view of the second embodiment of the present invention.

FIG. 6 is a cross-sectional view of a main part of the second specific example shown in FIG.

Detailed description of preferred examples

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings (FIGS. 4 to 6).

First, a first specific example of the present invention will be described with reference to FIG.

In FIG. 1, reference numeral 1 denotes a press machine body, and a plurality of guide rods 2 are erected on a top surface of a corner of a bed 1a so as to be parallel to each other. Yes.

The upper end of each of the guide rods 2 is fixed to the upper surface plate 3, and the guide cylinders 5 provided at the four corners of the slide 4 are vertically moved in the middle of the guide rod 2. It is self-supported. The ends of the plurality of slide cylinders 6 fixed to both ends of the bed 1a are provided at the ends of the slide 4 at both ends thereof. The slide cylinder 6 is pivotally mounted so that the slide 4 can be moved up and down along the guide rod 2 by the slide cylinder 6.

A plurality of hydraulic cylinders 8 are provided in the slide 4.

A piston rod 8b protrudes downward from the piston 8a housed in the hydraulic cylinder 8, and the piston rod 8b is A spherical portion 9a formed at the end of the link 9 at the end of 8b is supported by the rotation itself. ·

The spherical portion 9b formed on the lower end side of each link 9 has an upper part of a swing member 1 ◦ provided below the slide 4, and the links 9 are mutually connected. It is rotatably supported so that it is parallel.

An upper mold 11 is attached to the lower surface of the swinging member 1.0, and a resin is disposed between the upper mold 11 and the lower mold 12 installed on the bed 1a. In addition to performing compression molding, a plurality of guide portions 12a for guiding the vertical movement of the upper mold 11 are provided on the lower mold 12 side.

Next, the operation will be described. The slide cylinder 6 is lowered by the slide 4 along the guide rod 2 by the slide cylinder 6, and is moved to the swing member 10 by the slide cylinder 6. The upper die 11 attached is close to the lower die 12. When it comes into contact with the lower die 12, a guide part 1 2a protruding from the lower die 12 is proposed. At this time, the upper die 11 is matched with the lower die 12 by the aligning function of the swinging member 10 and the parallelism between the two dies 11 and 12 is adjusted. The degree of parallelism is not corrected by the expansion and contraction of the hydraulic cylinder 8. The correction of the parallelism of the two models 11 and 12 is performed at several places between the bed la and the slide 4. A linear scale and other position detectors are provided, and control is supplied to each hydraulic cylinder 8 based on the inclination of the slide 4 detected by these position detectors. Then, a method of controlling so that the parallelism between the two types 11 and 12 is maintained can be adopted.

After the upper mold 11 and the lower mold 12 are matched with each other while maintaining the parallelism by the above method, the resin is injected between the upper mold 11 and the lower mold 12 and then further injected. Lower the upper mold 11 and compress the resin.

When the compression molding is completed, the hydraulic cylinder 8 is contracted, and at the same time, the slide 4 is raised by the slide cylinder 6, and The molding is finished when the upper limit of Id 4 has been reached.

Hereinafter, the above operation is repeated to perform compression molding of the resin.

In the first specific example, the slide guided by a plurality of guide rods erected on the bed is moved up and down by a slide driving means such as a slide cylinder. At the same time, it is parallel to the lower part of the slide by a hydraulic cylinder provided on the slide. The upper die is provided on the rocking member that is self-oscillated and swings in the horizontal direction by the link, and the lower die is provided on the bead. Since the compression molding of the resin is performed between the lower molds, a large force acts on the guide part that guides the upper mold during molding by the alignment function of the swinging member. Nothing to do.

As a result, defects such as deformation of the guide portion and damage to the guide portion ゃ itself can be solved, and the upper and lower dies can be eliminated. Since the degree of parallelism can be corrected using a hydraulic cylinder, high-precision molding is possible. :,

Also, since the slide cylinder can be a small diameter that can move the weight of the slide up and down, it can move up and down at high speed even if the pump discharge amount is small. At the same time, the hydraulic cylinder is capable of forming a large amount of pressure by forming after the slide opening and by using a large diameter. Become so .

Since the stroke of the hydraulic cylinder can be small, the amount of oil inside the cylinder can be small, and the poor response due to oil shrinkage can be prevented. Because it can be reduced, the mold can be clamped with high accuracy.

Next, a second specific example of the present invention having improved mold clamping accuracy will be described with reference to FIGS. 5 to 6.

In the figure, reference numeral 21 denotes a press machine body, which is provided with screw holes 21b on the upper surface of the corners of the bead 21a, and these screw holes 21b. For example, the lower ends of four guide rods 2 are screwed so as to be parallel to each other. . In the middle of each guide rod 22, an engaging device 24 provided at each corner of the support frame 23 is fitted and inserted. Slide 5 is installed.

The slide 25 has a guide cylinder 26 fixed to the four corners, which is vertically inserted into the guide rod 22, and is attached to the slide drive mechanism 27. The lower end of the guide cylinder 26 is inserted into the engagement cylinder 24 a of the engagement device 24 from above while being moved up and down. 6a is bulged. -. The engaging device 24 has a guide portion 24b protruding in a direction orthogonal to the engaging tube 24a, and an engaging element is provided in the guide portion 24b. 2 4 c moves in the horizontal direction Self-contained 0

A semicircular notch 24 d having an inner diameter slightly larger than the outer diameter of the guide tube 26 is formed at the distal end side of the engaging element 24 c, and An operation cylinder 24 e is connected to the end side, and the engagement member 24 c is advanced to the guide cylinder 16 side by the operation cylinder 4 e. The upward movement of the slide 25 can be locked by fitting the notch 24d into the upper side of the locking portion 26a.

Further, a plurality of hydraulic cylinders 30 are provided in the slide 25 at a plurality of positions.

These piston rods 30b are provided with a piston rod 30b projecting downward from the hydraulic cylinder 30a which is accommodated in the hydraulic cylinder 30. At the same time, the upper end side spherical portion 30a of the link 31 is rotatably supported at the tip of the screw rod 30b.

The spherical portion 3Ob formed on the lower end side of the link 31 is attached to the upper part of the swing member 32 provided below the slide 25. 3 1 are supported by the self-rotation so that they are parallel to each other.

An upper die 33 is attached to the lower surface of the swing member 32, and compression molding of resin is performed between the upper die 33 and the lower die 34 fixed on the bead 2 la. In addition to the above, a plurality of guide portions 34a for guiding the vertical movement of the upper die 33 are provided on the lower die 34 side.

In the drawing, reference numeral 35 denotes a position detector such as a linear scale for detecting the position of the swing member 32.

On the four corners of the support plate 38 to which the slide drive mechanism 27 is mounted, there are provided rotation drive devices 39 for the guide rods 22.

The rotary drive device 39 includes a worm wheel 39a fixed to the upper end of the guide rod 22 and a worm wheel 39b for driving the worm wheel 39a. The worm 39b is connected to a drive source (not shown), so that each worm 39b is rotated synchronously.

Next, the operation will be described. When the hydraulic cylinder 30 in the slide 25 is in the piston state, the slide 25 is moved by the slide drive mechanism 27. Lower the engagement device 24 in this state. The engaging cylinder 24 e is advanced by the operating cylinder 24 e, and the engaging portion 26 a of the guide cylinder 26 is locked from above by the engaging cylinder 24 c. .

Next, in this state, each guide 扦 is driven by the rotary drive device 39.

2 Turn 2 to set the height of the engagement device to a position where the clamp stroke can be expected to an appropriate amount.

Then, in this state, the steel plate 30 of the hydraulic cylinder 30 is protruded to lower the template plate 32 so that the upper surface of the bed 21a can be moved in advance. When the lower surface of the moving member 32 comes in close contact with the upper surfaces of the upper and lower dies 33, 34 placed on the

While setting 35 to the zero position, the upper die 33 is fixed to the lower surface of the swinging member 32, and the lower die 34 is fixed to the bead 31a.

After the above operation is completed, the swinging member 32 is raised by the hydraulic cylinder 30, the engaging device 24 is released, and the slide driving mechanism 27 is released. Raise slide 25 to top dead center.

Next, the operation at the time of molding will be described. When the slide 25 descends to the bottom dead center by the slide drive mechanism 27, the slide 25 is moved by the engagement device 24. The lock 25 is locked at that position, and then the swing member 32 is lowered by the hydraulic cylinder 30 and guided by the guide portion 34a. The upper mold 33 fitted to the lower mold 34 is pressurized from above to close the mold.

Then, in this state, resin is injected between the upper mold 33 and the lower mold 34. After dispensing, the upper mold 33 is pressed with a hydraulic cylinder 30 to perform compression molding, and when the molding is completed, the hydraulic cylinder 30 is contracted. First, the swing member 32 is raised, and then the engaging device 24 is released. Then, the slide drive mechanism 27 raises the slide 25 to form the molding member. After the cycle is completed, the above operation is repeated, whereby the compression molding of the resin can be performed continuously.

In the second specific example, as described in detail above, the slide descending along the guide rod is engaged by the engagement device provided on the guide rod. In the forming area near the bottom dead center of the slide, the forming capacity is increased by using a large-diameter, high-pressure hydraulic cylinder. In other areas, the slide can be moved up and down by a small-diameter slide cylinder in other areas. Can be moved up and down.

A balance cylinder that supports the weight of the up-and-down movable part from below is provided between the nabead 1a and the engaging device 4, and the guide rod 2 and the bead 1a are connected. If the movable part is urged so as to cancel the gap in the same part, more accurate engagement positioning becomes possible.

In addition, after the slide 5 is locked at the bottom dead center of the slide 5, the slide drive mechanism 7 allows the slide 5 to be pulled up by a force that overcomes the weight of the movable portion. Every time it absorbs the gas at the locking part.

Claims

The scope of the claims

1. A press machine used as a compression molding machine.

(a) a plurality of guide rods standing parallel to each other on the press machine body;

(b) a slide which is movably supported by each of the guide rods, and which is vertically movable along the guide rod by means of a slide driving means; ,

(c) a plurality of hydraulic cylinders formed in the slide and each having a piston rod projecting downward from the lower surface of the slide;

(d) The piston rod of the hydraulic cylinder is fixed to the rod of the hydraulic cylinder so that the parallelism with respect to the upper surface of the bed can be captured and the rocker can be swung horizontally. A swinging member supported and suspended via a link,

(e) an upper die fixed to the lower surface of the swinging member, and

(f) a lower mold placed on the bead and

Press machine equipped with:

2. A press machine used as the compression molding machine according to claim 1, wherein the hydraulic cylinder is arranged so that the rocking member is parallel to the upper surface of the bed. A press machine characterized in that the protruding length of each piston rod of the damper is controlled based on a signal from a position detector that detects the position of the slide.

3. A press machine used as the compression molding machine according to claim 1, wherein a plurality of guides supporting the slide are provided. A dovetail rod is screwed into each of a plurality of threaded holes formed at appropriate locations in the bed at the bottom of each, while being placed at the upper end of each. A press device characterized in that it can be engaged with a rotary drive device that synchronously rotates the guide rods.

4. A press machine used as the compression molding machine according to claim 3, further comprising a locking device for locking the slide at a mold clamping position. Press machine.