JP3759701B2 - Molding machine parallelism adjustment device for injection molding machine - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a platen parallelism adjusting device between a fixed platen and a movable platen in an injection molding machine.
[0002]
[Prior art]
FIG. 4 is a configuration diagram of a mold clamping device of an injection molding machine conventionally used.
[0003]
As shown in the figure, a fixed platen 3, a movable platen 4, and a mold clamping housing 5 are disposed on the upper surface of a bed 1 made of a square pipe or the like. The fixed plate 3 and the mold clamping housing 5 are connected by four tie bars 6 penetrating the movable plate 4. One end of the tie bar 6 is screwed by a tie bar nut 7 and the other end is screwed by a mold clamping force adjusting body 8. Yes. A mold opening / closing drive device 9 is provided in the mold clamping housing 5, and the crosshead 11 that moves back and forth by the mold opening / closing drive device 9, the movable platen 4, and the mold clamping housing 5 are connected by a toggle mechanism 12. ,
In the case of an electric injection molding machine, the mold opening / closing drive device 9 includes a screw mechanism that converts a rotational motion composed of a ball nut 10 and a ball screw 13 incorporated in the cross head 11 into a linear motion, and this screw mechanism. The driving mechanism includes an AC servo motor 14 to be driven, a pulley 15 and a timing belt 16. A fixed mold body 17 and a movable mold body 18 are attached between the fixed platen 3 and the movable platen 4.
[0004]
Next, a method for adjusting the platen parallelism of the mold clamping device will be described.
[0005]
On the upper surface of the bed 1, a bed reference surface 2 on which a mold clamping device such as a fixed plate 3, a movable plate 4, and a mold clamping housing 5 is mounted is smoothly machined.
[0006]
The installation accuracy required for the mold clamping device is the following three items. ,
(A) The bed reference surface 2 on which the bed horizontal level mold clamping device is mounted is horizontal.
[0007]
(B) The fixed platen 3 is fixed vertically with respect to the bed reference surface 2 where the fixed platen verticality level is maintained (see angle Z in the figure).
[0008]
(C) The platen parallelism between the fixed platen parallelism platen 3 and the movable platen 4 is maintained.
[0009]
The platen parallelism refers to the distance between the surface of the fixed platen 3 and the movable platen 4, and if the two are in a completely parallel relationship, the distance between the platen surfaces at any position is equal and the accuracy of the platen parallelism is judged to be good. .
[0010]
FIG. 5 shows a state in which the platen parallelism is poor. The figure is exaggerated. In this state, the distance L between the board surfaces is different between the upper and lower sides due to a bet horizontal level defect, a fixed board perpendicularity defect, and the like. In addition, even in the case of molding a general molded product, it may be judged that the installation accuracy is necessary or sufficient, and in the ultra-precision molding including an optical disk, even a very small installation accuracy error may be judged as defective.
[0011]
In such a case, after confirming the bet horizontal level and the fixed platen verticality, the platen parallelism is readjusted as follows.
[0012]
If the bet horizontal level is defective, the horizontal level is first adjusted correctly. If the parallelism of the platen is not good despite the bet horizontal level being adjusted correctly, the fixing bolt 20 at the lower part of the fixed platen 3 is loosened as shown in FIG. A shim 19 is inserted between the fixed platens 3 to adjust the verticality of the fixed platen, or the tie bar nut 7 is loosened to slightly rotate the tie bar 6 so that the distance between the fixed platen 3 and the mold clamping housing 5 is reduced. Adjust the platen parallelism by adjusting.
[0013]
[Problems to be solved by the invention]
The parallelism between the fixed platen and the movable platen is precisely adjusted at the time of shipment from the factory, but after delivery to the user, the parallelism of the platen changes slightly depending on the accuracy of the mold used. In addition, even if the bed horizontal level, fixed platen verticality, and platen parallelism are adjusted precisely at the beginning, there is a possibility that they will be slightly messed up while operating for many years.
[0014]
If it is apparently greatly out of order, it is necessary to readjust again from the bet horizontal level, but even if fine adjustment is necessary due to the accuracy of the mold itself, or even if the platen parallelism is generally good, When fine adjustment is desired, the method of rotating the tie bar slightly or inserting the shim into the fixed plate each time is very large and requires considerable skill to adjust.
[0015]
Therefore, at the present time, when adjusting the parallelism of the platen, the user asks the service personnel of the molding machine manufacturer to make adjustments, and there is almost no adjustment by the user alone. From the user's perspective, adjustment costs are incurred and it is not economical.
[0016]
The present invention has been made to solve the above-described problems, and provides a platen parallelism adjusting device for an injection molding machine that can adjust the platen parallelism by the user himself / herself. Objective.
[0017]
[Means for Solving the Problems]
The mold platen parallelism adjusting device for an injection molding machine according to the present invention includes a fixed plate attached to one mold plate and processed into a spherical surface on one side, and a spherical surface processed with a spherical curvature equal to the fixed plate attached to the fixed plate. A support plate having a fixed plate and a movable plate which is slidable on a spherical surface, and a support plate having a flange on the outer edge portion is fixed to one mold plate, and a plurality of the support plates attached to the flange of the support plate The fixed plate is supported by the fixing bolts of the movable plate, and the movable plate is supported by a plurality of adjusting screws attached to the flange, and the distance between the movable plate and the other mold plate is equal in the standard state. To do.
[0020]
Moreover, it is preferable that the block is fixed to the front end surface of the flange of the support plate, and the adjustment screw is attached to the block.
[0021]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described based on examples with reference to the drawings.
[0022]
First, the basic principle of the present invention will be described.
[0023]
As shown in FIG. 1, a fixed plate 21 whose one surface is precisely spherically processed is attached to the movable platen 4. A movable plate 22 having a spherical surface with a spherical curvature equal to that of the fixed plate 21 is attached to the fixed plate 21 so that the movable plate 22 can freely slide on the spherical surface portion. The reference state is set such that the distance L between the movable plate 22 and the fixed platen 3 at an arbitrary location is the same.
[0024]
As shown in FIG. 2, when the movable plate 22 is changed upward from the reference state by δ, the distance L between the movable plate 22 and the stationary platen 3 at the same position vertically from the center of the stationary platen 3 is It changes by up and down ± X to become L1 (≈L + X) and L2 (≈L−X).
[0025]
S = position from the center of the fixed plate, fixed plate, movable plate θ = change in angle from the reference state of the movable plate (the center of the movable plate moves from A to A1)
When R1 = the radius of curvature of the fixed plate R2 = the minimum thickness of the movable plate T = R1 + R2 (R2 is negligible with respect to R1)
X / S = SINθ, and δ = T · SINθ = R1 · SINθ = R1 · (X / S).
[0026]
From this equation, an appropriate spherical radius R1 that satisfies the relationship of δ: X = 100 to 1000: 1 may be given. For example, when δ is adjusted with a screw having a pitch of 1 mm, the parallelism change amount X due to one screw rotation is obtained. Becomes 0.010 mm, and a practically sufficient accuracy can be obtained.
[0027]
Next, an embodiment of the platen parallelism adjusting device according to the present invention will be described.
[0028]
As shown in FIG. 3, a support plate 23 having a flange 23 a at the outer edge is fixed to the movable platen 4, and a block 25 is fixed to the front end surface of the flange 23 a by a fixing bolt 26.
[0029]
The fixed plate 21 having a spherical processed surface on one side is supported on the support plate 23 by a plurality of fixing bolts 24 provided on the flange 23a. The movable plate 22, which is spherically processed with a spherical curvature equal to the fixed plate 21 on one side, is supported by a plurality of adjustment screws 27 attached to a block 25 fixed to the flange 23 a. The adjustment screw 27 includes an X ₁ direction adjustment screw and a Y ₁ direction adjustment screw. Each adjustment screw 27 is prevented from being loosened by a lock nut 28 inadvertently.
[0030]
The movable mold body 18 is fixed to the movable platen 4 by a mold mounting bolt 29 that penetrates the movable plate 22, the fixed plate 21, and the support plate 23. Since the spherical radius in this drawing is 10,000 mm, the spherical processing line appears to be a straight line in the drawing. In addition, since this apparatus can receive mold clamping force on the whole spherical surface, durability of the whole apparatus is high.
[0031]
Next, the case of adjusting the mold platen parallelism by shifting the movable plate Y ₁ direction.
[0032]
First, the mold mounting bolt 29 is slightly loosened, and the lock nut 28 for the adjusting screw 27 is loosened. When the Y ₁ direction adjusting screw 27 is turned in this state, the movable plate 22 moves in the Y ₁ direction along a precisely machined spherical surface, and the angles of the movable plate 22 and the movable side mold body 18 can be finely adjusted. . As a result, the distance between the fixed platen 3 and the movable platen 4 changes, and the platen parallelism can be adjusted.
[0033]
In the above embodiment, both the plates 21 and 22 are processed into spherical surfaces, but they may be processed into processing forms other than spherical surfaces, for example, hyperboloids and parabolic surfaces having the same radius of curvature.
[0034]
The movable plate 22 is moved by the adjusting screw 27, but may be moved by a rack and pinion, a helicoid, a micrometer, or the like other than the screw method.
[0035]
In this embodiment, the apparatus is mounted on the movable platen 4, but can be mounted on the fixed platen 3. Further, it can be incorporated in the mold main bodies 17 and 18.
[0036]
【The invention's effect】
Since the present invention is configured as described above, the following effects can be obtained.
(A) Since spherical processing or the like is used for the fixed plate and the movable plate, the component configuration is relatively simple and inexpensive, and the accuracy is good.
(B) Since the basic alignment of the molding machine (tie bar elongation, fixed platen verticality, etc.) is not changed at all, it can be easily restored to the original molding machine state by removing this apparatus.
(C) Since only the movable plate is adjusted with an adjusting screw or the like, there is no need to disassemble and adjust the tie bar or the fixed platen, and the user can adjust the platen parallelism. If handled correctly, adjustment is not necessary for skill.
[Brief description of the drawings]
FIG. 1 is a principle diagram of the present invention and shows a reference state in which a movable plate is not changed.
FIG. 2 is a principle diagram of the present invention and shows a state in which a movable plate is changed.
FIG. 3 is a configuration diagram of a platen parallelism adjusting device according to the present invention. (A) is a front view, (b) is the sectional view on the AA line of (a).
FIG. 4 is a configuration diagram of a conventional mold clamping device of an injection molding machine.
FIG. 5 is a diagram showing a state in which the platen parallelism is poor.
FIG. 6 is a diagram illustrating a conventional method for adjusting the vertical degree of a fixed platen.
[Explanation of symbols]
21 Fixing plate 22 Movable plate 23 Support plate 23a Flange 24 Fixing bolt 25 Block 26 Fixing bolt 27 Adjustment screw 28 Lock nut 29 Mold mounting bolt

Claims (2)

A fixed plate (21) attached to one mold platen (4, 3) and having one surface processed into a spherical surface;
The fixed plate one surface attached to (21) are spherically in the fixing plate (21) equal to the spherical curvature, the fixed plate (21) and the movable plate being slidable spherical portion (22) It has a door,
A support plate (23) having a flange (23a) at the outer edge is fixed to the one mold platen (4, 3),
The fixing plate (21) is supported by a plurality of fixing bolts (24) attached to the flange (23a) of the supporting plate (23),
The movable plate (22) is supported by a plurality of adjustment screws (27) attached to the flange (23a),
The injection molding machine mold platen parallelism adjusting device, wherein the distance is equal at any place of the in the reference state the movable plate (22) and the other mold platen (3, 4). It said block to the leading end surface of the flange of the support plate (23) (23a) (25) is fixed, according to claim 1, wherein the adjusting screw in the block (25) (27) is attached A platen parallelism adjustment device for injection molding machines.

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