JPS60143915A - Clamping device of molding machine - Google Patents

Abstract

PURPOSE:To contrive to simplify a mold clamping device by using a powered mold clamping cylinder for the cylinder closing the mold at high speed. CONSTITUTION:The front inner diameter D2 of the cylinder member 7 of a clamping cylinder 6 is formed to be larger than the rear inner diameter D1 thereof, giving the difference between its front inner diameter and rear inner diameter. While the piston with the outer diameter fitted to the front inner diameter D2 is moved to the front from the rear of the cylinder, the pressurized oil in the front side is caused to flow to the rear side from the gap formed at the periphery of the piston 11, thereby reducing the oil pressure resistance in the front side at mold closing and simultaneously increasing the oil amount in the rear side. Accordingly, if the mold clamping cylinder is used for mold closing, the supplied amount of pressurized oil required for mold closing is sufficient to be little, and the mold closing may be carried out at high speed. Moreover, this device is different from the former device in which the front and the rear of the cylinder is connected, opening and closing the through hole bored on the piston by a disk valve. Because the valve or the oil pressure path, etc. requiring manual operation is unnecessary to be provided, the high speed mold closing is carried out by using the clamping cylinder, and yet its structures is simple and there occurs no trouble.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a mold clamping device for a molding machine used for molding synthetic resin.

An object of the present invention is to simplify a mold clamping device by utilizing a strong mold clamping cylinder as a high speed mold closing cylinder.

Another object of the present invention is to provide a mold clamping device that can perform high-speed mold closing with the supply of a small amount of pressure oil, allows easy mold thickness adjustment, and has good mold clamping effect.

The present invention will be explained in detail below with reference to illustrated embodiments.

In the figure, numerals 1 and 2 are fixed plates extended on the machine base with required spacing, and multiple horizontal tie bars 3. :1 to" :ri concatenation.

Reference numeral 4 denotes a movable plate whose corners are inserted through the tie bars 3, 3, and a mold 5 is installed separately on the opposite side of the movable plate 4 and one of the fixed plates. As shown in FIG. 8, a hydraulically operated mold clamping cylinder 6 is movably mounted on the machine base.

The mold clamping cylinder 6 is provided with a cylindrical body 8 which is located at the tip of a cylinder member 7 and inserted through the fixed platen 2, and a screw 9 is provided around the cylindrical body 8. In addition, a stepped portion 7a is formed on the inner circumferential wall of the cylinder member 7 so as to be offset toward the front side, so that the inner diameter D2 on the front side and the inner diameter D1 on the front side are It is a hollow mold clamping cylinder that reciprocates inside the cylindrical body 8, and its tip is connected to the center of the back of the movable platen 4, and its rear end is connected to the front inner diameter D of the cylinder member 7.
A piston 11 with an outer diameter matching 2 is provided.

In addition, in the cavity 12 inside the mold clamping silane gloss 10, there is a rapid-feeding piston 1 having a shaft portion 13 fixed to the rear end of the cylinder member 7.
4 has been inserted, which makes the empty space the shaft part.

The cylinder 12 reciprocates the mold clamping silant gloss IO at high speed by means of pressure oil from a passage 15 provided in the cylinder 13.

Reference numeral 16 denotes a fixing member for the mold clamping cylinder 6 which also serves as a mold thickness adjusting member, and is fixed to the inner surface of the movable platen 4.

As shown in FIG. 6, this fixing member 16 consists of a pair of half-nut-shaped members having screws on the inner surface that engage with the screws 9 of the cylindrical body 8, and the pair is connected with a bolt 17 so as to be openable and closable. It is.

In addition, 18 is a discharge passage in the mold clamping cylinder gloss, 19 is a cradle for the mold clamping cylinder 6 which also serves as a rotation stopper, 20 is an injection cylinder,
Reference numerals 21, 22, and 23 indicate the valves of the hydraulic circuit.

High-speed mold closing (Fig. 1) In the mold open state shown in Fig. 5, when the valves 21 and 22 are switched to the state shown in Fig. 1 and pressure oil is supplied between the rear end of the cylinder part control 7 and the piston 11. , the piston 11 is pressurized in the distal direction, and the mold clamping planter 10 moves in the mold closing direction together with the movable platen 4. At this time, there is fd between the piston 11 and the inner circumferential wall of the cylinder member 7, and the diameter DI'+D2
A gap is generated due to the difference between the cylinder members and the piston 11, and this gap acts as a gap for pressure oil to flow between the tip of the cylinder member and the piston 11. Therefore, the pressure oil on the front side has an inner diameter D2 of the piston 11.
The oil flows out until the inside of the cylinder member is completely blocked from front to back by the piston 11, and the amount of oil on the rear side increases.

Also, under what conditions does the pressure oil act?
Even if the pressure-receiving area of 1 is small, it is substantially limited to the cross-sectional area of the mold closing sealant 10, so the mold is closed at high speed until the piston 11 reaches the stepped portion 7aVC in the cylinder member.

Mold Closing Slowdown (Fig. 2) When the inner edge of the L-marked piston 11 reaches the stepped portion 7a, the amount of pressure oil flowing out is throttled by the numerous teeth and grooves II & provided on the inner edge, and the flow rate of the pressure oil is reduced. Pressure oil 17t ili until the l-groove +1a is closed by the inner wall of the cylinder member 7.
decreases, and the debris continues to flow out. For this reason, the moment the piston 11 reaches the stepped portion 7a, the escape area for the pressure oil on the front side is not lost, and the mold is closed when the piston 11 reaches the stepped portion 7a.
When reaching a, the speed automatically switches from high speed to slow down.

Strong mold clamping (Fig. 3) When the L-marked piston 11 moves further forward from the stepped portion 7a and matches the front inner diameter D2 of the cylinder member 7, and the inside of the cylinder member is completely shut off from front to back, the valve 21 is closed. When the switch is switched as shown in the figure so that the pressure oil on the front side flows out of the cylinder, the pressure oil on the rear side will act on the entire pressure receiving surface of the piston 11, and a strong pressure oil action will be applied thereto. j Ugete-
Slow down φ, switch to strong mold clamping. The reaction force generated when the mold is clamped is supported by the fixed platen 2 via the cylindrical body 8 and the fixed part ['+6].

Powerful mold opening (Fig. 4) After injection molding, switch the valve 23 to the state shown in Fig. 4 to supply pressure oil to the front side of the cylinder member 7 and to allow pressure oil from the rear side to flow out of the cylinder. When this happens, the piston 11 is pressurized toward the rear, and a strong mold opening occurs there.

High-speed mold opening (Fig. 5) When the strong mold opening is completed, each valve 21°22
, 23 to the state shown in FIG.
When the pressure oil at the front and rear of the mold is supplied to the cylinder 12 of the mold clamping gloss 1 () from the passage 1i of the shaft 13 to the outside of the cylinder (( The mold moves to , and high-speed mold opening occurs there.

Mold Thickness Adjustment (Figure 6) In the mold clamping cylinder 6, unless the piston 11 is in a position where it is completely accommodated in the front part of the cylinder member 7, the strong mold clamping shown in Figure 3 cannot be performed. Therefore, it is necessary to adjust the mold thickness depending on the mold 5.

To adjust the mold thickness, in the mold closed state, loosen the fixing member 1 (), move the cylindrical body 8 and the slider part 7 rearward,
This can be easily done by simply tightening the fixing member 16 again at the position where the piston 11 is located on the front side.

9 and 10 show other embodiments of the mold thickness adjusting device, and FIG. 9 shows tie bars 3, 3 installed between the movable platen 4 and the fixed platen 2 behind it. Moving pelvis 2 as a guide
4 is provided, and the tip of the cylinder member 7 of the mold clamping sill 6 is held on this movable plate 24, and a screw shaft 5 is provided protruding from the rear end of the sill member 7, and is inserted into the fixed plate 2 to fix it. It has a structure in which the half-nut-shaped fixing member 16, which also serves as a mold thickness adjusting member, is fixed to the inner surface of the board 2.

Further, FIG. 10 shows that the screw shaft 5 is rotatably connected to the rear end of the cylinder member 7 using a receiving member 26, and
This shows a structure in which the mold clamping cylinder 6 is fixed to the fixed plate 2 by screwing into the screw hole provided in the center of the fixed plate 2, and the mold thickness can also be adjusted by rotating the screw shaft 5. be.

In the embodiments shown in FIGS. 1 to 8, the mold clamping wheel 10 is also used as a high-speed mold opening shilling vC, but other shillings may be provided.

As described above, in this invention, the inner diameter of the silling member 7 of the mold clamping sill 6 is made different between the front part and the rear part, so that the rear inner diameter B1 is larger than the front part inner diameter B2, and the front part inner diameter B2 is made larger than the front part inner diameter B2.
While the piston 11, which has an outer diameter compatible with By reducing the hydraulic resistance on the front side as much as possible and increasing the amount of oil on the rear side, the mold clamping cylinder can be used to close the mold.
Even if it is used, the supply 1ii of pressure oil required for mold opening is small, and the mold can be closed at high speed.

Moreover, unlike conventional devices that connect the front and rear parts of the cylinder by opening and closing a through hole drilled in the piston using a disc or groove, pulp and hydraulic passages, etc., which require manual operation by a person, are installed in the cylinder part. Since there is no need to provide a mold clamping cylinder, the mold can be closed at high speed (1η construction is extremely simple and there are few failures).

Fixed F51 (
Since the mold thickness can be adjusted with kA, mold thickness adjustment is also easy, and the distance between the pair of fixed plates and the length of the mold clamping cylinder can be made shorter than in the conventional direct pressure type. It has many features such as being able to reduce the number of parts required for the device.

[Brief explanation of the drawing]

The drawings schematically show an embodiment of a mold clamping device for a molding machine according to the present invention, and FIGS. 1 to 5 are vertical cross-sectional views showing the steps in order, and FIG. 6 is a vertical cross-sectional view showing mold thickness adjustment. , Figure 7 is a cross-sectional view of the line shown in Figure 2, Figure 8 is an end view of the mold clamping cylinder, and Figure 9 is a side view of the clamping cylinder.
The figure is a longitudinal sectional view showing an embodiment of the mold thickness adjusting means, No. 10.
The figure is a longitudinal cross-sectional view showing still another embodiment of the same. 1.2...Fixed plate 3...Tights-4...
・・Movable platen 6・・・Mold clamping sillage 115.5
．．・]11-Noj view 8...Cylindrical body 9...
・Screw 10...mold clamping glaze/gloss 11...piston lla...chie/groove 12...
Schilling 14...Piston 16...Fixing member 17...Bolt patent applicant Tsuyoshi Yoiki

Claims (1)

[Claims] /The cylinder member has a cylindrical body with a screw around the tip, and a mold clamping gland inside the cylinder is provided so as to be able to reciprocate, and the inner diameter of the cylinder member is set so that the inner diameter of the cylinder member is larger than the front inner diameter at the stepped part. The inner diameter of the cylinder is formed to have a large diameter so that there is a difference, and the outer diameter of the piston of the mold clamping cylinder gloss is matched to the inner diameter of the front part. When the piston is located behind the stepped part, the inner wall of the cylinder and the piston are 9, the mold clamp/linder is inserted into the stationary plate as described above, and is fixed to the stationary plate using a fixing member that also serves as a mold thickness adjustment member. Features mold clamping device of molding machine.