JP3602914B2 - Mold clamping device in synthetic resin molding machine - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention provides a molding machine or a transfer molding machine out morphism synthetic resin, to an apparatus for clamping a strong force the pair of molds.
[0002]
[Prior art]
In a conventional molding machine, one or both of a lower mold and an upper mold are configured to move up and down by a main hydraulic cylinder. By supplying a high-pressure hydraulic pressure to the main hydraulic cylinder, both dies are clamped with a strong force.
[0003]
[Problems to be solved by the invention]
However, supplying high-pressure hydraulic pressure to the main hydraulic cylinder for raising and lowering one or both of the two dies when clamping the two dies as described above requires a hydraulic source such as a hydraulic pump. In addition to having to generate high-pressure oil pressure, hydraulic equipment such as a hydraulic switching valve and a hydraulic pipeline must also be adapted to high-pressure oil pressure, and a hydraulic pump and a hydraulic switching valve In addition, the entire hydraulic apparatus including the above becomes complicated and considerably large, and the price of the hydraulic apparatus becomes expensive, so that the cost required for molding is greatly increased.
[0004]
In recent years, instead of using a hydraulic cylinder to perform mold clamping, a jack device that uses a ball screw has been used to perform mold clamping. However, a jack device that uses a ball screw has a complicated and large structure. In addition, the cost is high, so that the cost required for molding is greatly increased.
An object of the present invention is to provide a mold clamping device that solves these problems.
[0005]
[Means for Solving the Problems]
To achieve this technical problem, the present invention
"A pair of left and right sliding members are moved laterally between a movable head member to which one of the lower mold and the upper mold is attached, and a support member located on the back of the movable head member. The two sliding members are freely disposed, and one or both of a portion where the two sliding members contact the movable head member and a portion which contacts the support member are provided between the two sliding members. Actuating means provided with an inclined sliding surface which is inclined obliquely upward or obliquely downward from the portion to the outside, and between the two sliding members, the two sliding members are moved away from or approaching each other. Will be mounted. "
It was configured to say.
[0006]
[Action and Effect of the Invention]
In this configuration, in a state where the two dies are matched, when each of the two sliding members is moved away from each other along the inclined sliding surface by the operating means, or is moved close to each other, the movable base member and One of the molds attached thereto is pressed against the other mold by the movement of the two sliding members along their respective inclined sliding surfaces. Will be tightened.
[0007]
This mold clamping is performed according to the so-called "wedge" principle that both sliding members move along their respective inclined sliding surfaces. For example, the inclination of the inclined sliding surface is reduced by 1 /. If it is set to 100, the clamping force can be enlarged to 100 times the force of moving both sliding members, so that a large clamping force can be obtained with a small moving force of both sliding members. .
[0008]
In this case, the rollers are rotatably provided on a portion of the two sliding members that contacts the movable head member or the support member and a portion that contacts the inclined sliding surface, so that the two sliding members are moved. Since the friction loss at the time can be reduced, a large clamping force can be obtained with a small moving force of both sliding members.
Therefore, according to the present invention, the mold clamping is greatly reduced in size and weight as compared with the conventional method in which high pressure hydraulic pressure is supplied to the main hydraulic cylinder or a jack device using a ball screw. This has the effect that the price can be greatly reduced.
[0009]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, an embodiment of the present invention will be described with reference to FIGS.
In this drawing, reference numeral 1 denotes a synthetic resin injection molding machine. The injection molding machine 1 includes a lower mold 2 and an upper mold 3, and the lower mold 2 of the two molds 2, 3. Is mounted on the upper surface of a lower mold movable head member 6 which freely moves up and down along a plurality of columns 5 erected from a machine stand 4, while the upper mold 3 is mounted along each of the columns 5. It is attached to the lower surface of the movable head member 7 for the upper die that moves freely up and down.
[0010]
A toggle link type lifting mechanism 8 for vertically moving the lower die 2 is provided between the lower die movable head member 6 and the machine base 4.
This toggle link type elevating mechanism 8 includes a tip of one toggle link 8b whose base end is pivotally connected to the machine base 4 by a pin 8a, and a base end to the pin 8c on the side of the lower movable head member 6 side. The tip of the other toggle link 8d pivotally connected is pivotally connected with a pin 8e, and the gear 8f fitted to the proximal pin 8a of the one toggle link 8b meshes with the pinion gear 8h on the output shaft of the motor 8g. By rotating one of the toggle links 8b by a motor 8g, the lower movable head member 6 and thus the lower mold 2 are vertically moved.
[0011]
On the other hand, the upper mold movable head member 7 to which the upper mold 3 is attached is suspended by a spring 10 with respect to a support member 9 fixed to the upper end of each column 5. And a supporting member 9, a mold clamping device 11 is provided.
The mold clamping device 11 includes a pair of left and right sliding members 12 and 13, and each of the two sliding members 12 and 13 has a roller 12 a that comes into contact with the upper surface of the lower mold movable head member 7. , 13a, and rollers 12b, 13b which are in contact with the lower surface of the support member 9 are rotatably provided.
[0012]
A portion of the upper surface of the lower die movable head member 7 where the upper rollers 12a and 13a of the two sliding members 12 and 13 come into contact with each other is directed outward from an intermediate portion between the two sliding members 12 and 13. The portions of the lower surface of the support member 9 where the lower rollers 12b and 13b of the two sliding members 12 and 13 contact the inclined sliding surfaces 14 and 15 that are inclined obliquely upward at an appropriate angle. A pair of pneumatic cylinders are formed between the sliding members 12, 13, respectively, while being formed on inclined sliding surfaces 16, 17 which are inclined downward at an appropriate angle from the middle portion of the members 12, 13 to the outside. An operating means such as a hydraulic cylinder 18 or 19 is mounted, and the sliding members 12 and 13 are moved toward and away from each other by the operating means such as the pneumatic cylinders 18 and 19. That.
[0013]
In this configuration, the lower die 2 is moved up and down by the toggle link type elevating mechanism 8 so that the lower die 2 is matched with the upper die 3 (at this time, both the upper and lower mechanisms in the toggle link type elevating mechanism 8 are used). The toggle links 8b and 8d stand vertically in a straight line to support the lower mold 2 so as not to move downward. In this state, each of the sliding members 12 and 13 is connected to the pneumatic cylinders 18 and 19 thereof. The movable base member 7 for the upper die and the upper die 3 attached to the movable base member 7 are moved apart from each other by operating means such as , 16, and 17, and moves down to be pressed against the lower mold 2 supported by the toggle link type lifting mechanism 8. The dies 2 and 3 are clamped.
[0014]
This mold clamping is performed according to the so-called "wedge" principle in which both sliding members 12, 13 move along their respective inclined sliding surfaces 14, 15, 16, 17, and for example, If the slope of each of the inclined sliding surfaces 14, 15, 16, 17 is set to 1/100, the mold can be clamped by enlarging to 100 times the force of moving both sliding members 12, 13. A large clamping force can be obtained with a small moving force of the two sliding members 12 and 13.
[0015]
In addition, rollers 12a, 13a, 12b, and 13b are rotatably provided at portions of the two sliding members 12, 13 that contact the inclined sliding surfaces 14, 15, 16, 17, respectively. Thus, the friction loss when moving the sliding members 12, 13 can be reduced.
In the above-described embodiment, the case where the inclined sliding surfaces 14, 15, 16, 17 are provided on both the upper surface of the upper die movable base member 7 and the lower surface of the support member 9 has been described. The present invention is not limited to this. For example, as shown in FIG. 3, the inclined sliding surfaces 14, 15 are provided only on the upper surface of the upper movable base member 7, or as shown in FIG. May be configured such that the inclined sliding surfaces 16 and 17 are provided only on the lower surface of.
[0016]
Further, the direction of the inclination on each of the inclined sliding surfaces 14, 15, 16, 17 is reversed as shown in FIG. 5, and the mold is clamped by the approaching movement of the two sliding members 12, 13. Is also good.
Furthermore, the above-described embodiment shows a case where the mold clamping device 11 is provided between the upper mold movable head member 7 and the support member 9 located on the back surface of the upper mold movable head member 7. However, the present invention is not limited to this, and the upper movable head member 7 is configured to move up and down by the toggle link type lifting mechanism 8 and the like, while the lower movable movable member 6 And the machine base 4 (in this case, the machine base 4 corresponds to the support member in the claims), the mold clamping device 11 may be provided. It goes without saying that the present invention can be applied to a molding machine in which both the lower mold 2 and the upper mold 3 are moved up and down.
[0017]
By configuring the rollers 12a and 12b to be in contact with each other and the rollers 13a and 13b to be in contact with each other, it is possible to mutually support the load on these rollers 12a, 12b, 13a and 13b. Since the bearing load on each bearing portion can be reduced, there is an advantage that both sliding members 12 and 13 can be reduced in size and weight.
[Brief description of the drawings]
FIG. 1 is a front view showing a first embodiment of the present invention.
FIG. 2 is a sectional view taken along the line II-II of FIG.
FIG. 3 is a front view showing a second embodiment of the present invention.
FIG. 4 is a front view showing a third embodiment of the present invention.
FIG. 5 is a front view showing a fourth embodiment of the present invention.
[Explanation of symbols]
REFERENCE SIGNS LIST 1 synthetic resin injection molding machine 2 lower mold 3 upper mold 4 machine stand 5 column 6 lower mold movable head member 7 upper mold movable head member 8 elevating mechanism 9 support member 11 mold clamping devices 12, 13 sliding members 12a, 12b, 13a, 13b Rollers 14, 15, 16, 17 Inclined sliding surfaces 18, 19 Pneumatic cylinder

Claims (2)

A pair of left and right sliding members can be moved laterally between a movable head member to which one of the lower mold and the upper mold is attached, and a support member located on the back of the movable head member. The sliding member is provided at one or both of a portion contacting the movable head member and a portion contacting the supporting member, and an intermediate portion between the sliding members. While providing an inclined sliding surface that is inclined obliquely upward or obliquely downward from the portion toward the outside, an actuating means is provided between the two sliding members so as to move the two sliding members away from or close to each other. A mold clamping device in a synthetic resin molding machine characterized by being mounted. In the above-mentioned "Claim 1 ", a roller is rotatably provided on a portion of the two sliding members that contacts the movable head member or the support member and a portion that contacts the inclined sliding surface. A mold clamping device in a synthetic resin molding machine.

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