JP2968395B2 - Mold changing device of injection molding machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mold changing device for an injection molding machine.

[0002]

2. Description of the Related Art Conventionally, a resin heated and melted in a heating cylinder is injected and filled in a mold at a high pressure.
In the case of molding a molded article with an insert using an injection molding machine in which the molded article is cooled by cooling and solidifying, and then the mold is opened and the molded article is taken out, the mold including an ejector plate and the like are used. The child is mounted on the mold insert holder. When the insert is mounted on the mold, the insert is removed from the mold insert holder, and after the insert is mounted on the mold, the insert is mounted on the mold insert holder again.

[0003] Also, when the mold is replaced, the insert is removed from the mold insert holder, and the insert having another mold is mounted again in the mold insert holder. FIG. 2 is a cross-sectional view of a mold device of a conventional injection molding machine, and FIG. 3 is an explanatory view of mounting of nests in a mold device of a conventional injection molding machine. In FIG. 2, reference numeral 1 denotes a fixed mold, 2 denotes a movable mold that is disposed so as to be able to freely contact and separate from the fixed mold 1, and 3 reinforces the movable mold 2 and a core. It is a receiving plate for attaching. 6 is an upper ejector plate, 7 is a lower ejector plate, 8 is a fixed-side mold mounting plate to which the fixed-side mold 1 is attached, 9 is the movable-side mold via a spacer block (not shown) and a receiving plate 3. Reference numeral 2 denotes a movable-side mold mounting plate to which is mounted.

Reference numeral 11 denotes a locating ring for facilitating attachment of the fixed mold 1 to a fixed platen (not shown), and a locate ring 12 for smoothly performing nozzle touch, and 12 denotes a molten resin injected from an injection nozzle (not shown). A sprue bush 13 for guiding the fixed mold 1 is attached to the movable mold 2 to guide the fixed mold 1.
4 is a guide pin bush, 16 is a sprue lock pin,
17 is an ejector pin, 18 is a return pin, and 19 is an upper ejector plate 6 surrounding the return pin 18.
, A spring for urging the movable mold 2 away from the movable mold 2, an ejector guide pin 21 for smoothly performing an ejector operation by the ejector pin 17, an ejector guide pin bush 22, and a stationary mold 1. This is a cavity formed between the movable molds 2. In addition, P. L. Is a parting line.

In the mold apparatus having the above-described configuration, when the injection nozzle injects the resin in a state where the injection nozzle is in contact with the sprue bush 12, the resin becomes the sprue bush 12 and the runner 23.
a, is sent into the cavity 23 through the gate 23b. When the injection is completed, the pressure is maintained for replenishing the cavity 23 with the resin by the amount of the resin contracting. Thereafter, the resin is cooled to form a molded product, and when the movable mold 2 moves to the left in the figure and separates from the fixed mold 1, the upper ejector plate 6 and the lower ejector plate 7 are ejected by an ejector (not shown). The ejected product is pushed out by the rod, and the ejector pin 17 protrudes the molded product and releases the molded product from the movable mold 2.

In FIG. 3, 1 is a fixed mold, 2 is a movable mold, 3 is a receiving plate, 6 is an upper ejector plate, 7
Is a lower ejector plate, 8 is a fixed mold mounting plate to which the fixed mold 1 is attached, 9 is a movable mold to which the movable mold 2 is attached via a spacer block 31 and a receiving plate 3. A mold mounting plate, 18 is a return pin, 19 is a spring surrounding the return pin 18, and 32 is a reinforcing plate for reinforcing the fixed mold 1.

Reference numeral 35 denotes an insert formed by the fixed mold 1, the movable mold 2, the receiving plate 3, the upper ejector plate 6, the lower ejector plate 7, the reinforcing plate 32 and the like. The insert 35 can be handled as a cassette, and the mold can be exchanged via the insert 35 when the type of a molded product is changed. I have.

For this purpose, a mold insert holder 36 for mounting the insert 35 is provided. The mold insert holder 36
Are a fixed-side mold mounting plate 8, a fixed-side block 38 attached to the fixed-side mold mounting plate 8, a movable-side mold mounting plate 9,
It comprises a spacer block 31 and a movable block 39 attached to the spacer block 31. And, along the insertion direction of the insert 35, the reinforcing plate 32
A convex ridge 32a is formed on the receiving plate 3, while a dovetail groove 38a corresponding to the convex ridge 32a is formed on the fixed-side block 38, and a dovetail groove corresponding to the convex ridge 3a is formed on the movable-side block 39. 39a are formed.

[0009] In the mold apparatus having the above-described configuration, the ridge 32
The insert 35 can be mounted on the mold insert holder 36 by inserting the inserts a and 3a into the dovetail grooves 38a and 39a, respectively.
Can also be removed.

[0010]

However, in the mold device of the conventional injection molding machine, the ridges 32a, 3
a is inserted into the dovetail grooves 38a and 39a, respectively, so that the insert 35 is attached to the mold insert holder 36.
If it is not inserted into the holes 8a and 39a, the insert 35 tilts during the insertion and stops at that point.

In this case, the insert 35 must be pulled up again and mounted on the mold insert holder 36 again, which not only complicates the work of replacing the mold, but also increases the operation cost. In addition, a plurality of colors such as conventional four colors, five colors, or four materials,
In an injection molding machine of a plurality of materials such as five materials, one injection molding machine is associated with a plurality of injection devices, and each injection device sequentially injects a resin of each color or each material.

However, in this case, since each injection device is mounted on a pedestal or the like and arranged in the mold clamping direction or the parting line direction, the injection molding machine becomes a dedicated machine, and molding of a plurality of colors or a plurality of materials is performed. If not,
Only the specific injection device is used, and the utilization efficiency is reduced. The present invention solves the problems of the mold apparatus of the conventional injection molding machine, reduces the work cost by facilitating mold replacement work, and when performing molding of a plurality of colors or materials, An object of the present invention is to provide a mold exchanging device for an injection molding machine, which can use a single-color or single-material injection device or a two-color or two-material injection device and can improve the utilization efficiency of the injection device. I do.

[0013]

In order to achieve the object, a mold exchanging apparatus for an injection molding machine according to the present invention comprises a platen, at least a movable mold, and an insert selectively mounted on the platen; Die changing means for attaching and detaching the insert to and from the platen.

A projection is provided for positioning the insert and the movable member. Next, when performing molding of a plurality of colors or a plurality of materials, a plurality of injection devices are provided corresponding to a plurality of injection molding machines provided on the positioning frame, and a plurality of injection devices are provided corresponding to each injection device. A mold position is formed, and a fixed mold, a fixed platen, and a movable platen are provided at the mold position.

In addition, a nest including at least a movable side mold is configured in common for each injection device, and the nest is replaced by a mold movable means at each mold position. Attached to and detached from. A projection is provided for positioning between the insert and the movable member.

[0016]

According to the present invention, as described above, the mold changing device of the injection molding machine has a platen, at least a movable mold, and a nest selectively attached to the platen; Mold exchanging means for attaching and detaching the child to and from the platen. Then, ridges and grooves for guiding the nesting are formed on the nesting and the platen along the insertion direction, and projections and holes for positioning the nesting are formed.

A molded product is molded by filling a resin into a cavity formed between the fixed mold and the movable mold. Also, when molding a molded article having an insert or when exchanging a mold, the insert is detached by the mold exchanging means. A projection is provided for positioning between the insert and the movable member. Therefore, when the nest is set at each mold position, the nest is positioned with respect to the movable member by the projection.

Next, when molding a plurality of colors or a plurality of materials, a plurality of injection devices are provided corresponding to the plurality of injection molding machines provided on the positioning frame. A plurality of mold positions are formed, and a fixed mold, a fixed platen, and a movable platen are provided at the mold positions.
Therefore, the resin can be filled using each injection device at each mold position.

A nest including at least a movable-side mold is configured in common for each injection device, and the nest is replaced by a mold-changing means by a preset movable member on the movable side at each mold position. Attached to and detached from. Accordingly, when the insert is sequentially moved to each mold position and the resin is filled by the corresponding injection device at the mold position, molding of a plurality of colors or a plurality of materials can be performed.

A projection is provided for positioning the insert and the movable member. Therefore, when the nest is set at each mold position, the nest is positioned with respect to the movable member by the projection.

[0021]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a schematic view of a mold changing apparatus of an injection molding machine showing an embodiment of the present invention. In this case, 2
Two injection molding machines that can perform color molding are arranged,
The case of forming four colors will be described.

In the figure, reference numeral 40 denotes a positioning frame,
Reference numeral 1 denotes a frame, on which two injection molding machines 42 and 43 are fixed. Each injection molding machine 42, 43
Are each composed of a normal two-color injection molding machine having two mold positions, and two of these are combined to form a four-color injection molding machine. For this purpose, the injection molding machines 42 and 43 are provided with movable platens 44 and 45, respectively, and the movable platen 44 is provided with first and second mold positions A and B.
However, third and fourth mold positions C and D are formed on the movable platen 45. Then, the first mold position A to the fourth mold position D
, A first to a fourth injection device (not shown) are provided. The movable platens 44, 4
5 are mutually positioned by the positioning frame 40.

The frame 41 is provided with a mold changing means 47, and the mold changing means 47
8 is the movable platens 44, 45 of the injection molding machines 42, 43.
, That is, it can be attached or detached. In the case of this embodiment, the insert 48 is selectively attached to and detached from the movable platens 44 and 45 at the first mold position A to the fourth mold position D.

The insert 48 includes a fixed mold, a movable mold, a receiving plate, an upper ejector plate,
It can be constituted by a lower ejector plate, a reinforcing plate, and the like, but it is sufficient if at least the movable mold is replaced. In the present embodiment, as will be described later, it is configured by a movable mold mounting plate, an upper ejector plate, a lower ejector plate, and a movable mold.

Reference numerals 49 and 50 denote tie bars provided between a fixed platen and a toggle plate (not shown) of each of the injection molding machines 42 and 43, and the movable platens 44 and 45 slide along the tie bars 49 and 50 (see FIG. Go back and forth. Reference numeral 52 denotes a support.
The mold exchanging means 47 is supported thereon.

The mold exchanging means 47 includes first mold positions A to
A belt gear 55 stretched over the fourth mold position D,
It has a gear 56 that meshes with the belt gear 55 and a rotation motor 57 that rotates the gear 56. By driving the rotation motor 57 while controlling the number of pulses, the mold exchanging means 47 itself can be used. It can be moved left and right. 58 is a stopper provided so that the mold changing means 47 does not move too much.

The mold changing means 47 includes a gear 56.
, A connection attachment 63 is provided on a piston rod 62 of the air cylinder 61. Therefore, by operating the air cylinder 61, the insert 48 can be moved up and down. Further, the insert 48 can be disengaged at each of the first to fourth die positions D by the connection attachment 63.

In the mold exchanging apparatus of the injection molding machines 42 and 43 having the above-described configuration, for example, in the case of using the first mold position A to the fourth mold position D and performing molding of four colors, first, the mold exchange is performed. The means 47 is operated to set the insert 48 at the first mold position A. That is, the rotation motor 57 is driven to
To move the mold exchanging means 47 to a position immediately above the first mold position A. Subsequently, the air cylinder 61 is operated to lower the insert 48, and when the first mold position A is reached, the connection attachment 63 is operated to release the insert 48.

Thus, the insert 48 is inserted into the first mold position A.
Is set, the mold is clamped, and the first mold position A is set.
, A nozzle touch is performed on the fixed mold by the first injection device, and molding of the first color is performed by the first injection device. Next, the mold is opened, the connection attachment 63 is operated to engage the insert 48, and the air cylinder 61 is operated to raise the insert 48. Subsequently, the rotation motor 57 is driven to rotate the gear 56,
The mold exchanging means 47 is moved right above the second mold position B. Then, the air cylinder 61 is operated to lower the insert 48, and when the second mold position B is reached, the connection attachment 63 is operated to release the insert 48.

Thus, the insert 48 is inserted into the second mold position B.
Is set, the mold is clamped, and the second mold position B is set.
The nozzle touch is performed on the fixed mold by the second injection device corresponding to (2), and the molding of the second color is performed by the second injection device. Next, the mold is opened, the connection attachment 63 is operated to engage the insert 48, and the air cylinder 61 is operated to raise the insert 48.

Hereinafter, the third color molding and the fourth color molding are similarly performed.
Color molding can be performed. Next, a description will be given of a positioning device of the insert 48 when the insert 48 is set at the first mold position A to the fourth mold position D by the mold exchanging means 47. FIG. 4 is a schematic view of a positioning device in a mold changing device of an injection molding machine showing an embodiment of the present invention.

In the case of the mold exchanging device of the injection molding machines 42 and 43 (FIG. 1) of the present invention, the positioning device is the first mold position A.
Since the same structure is used at any one of the mold positions D to D, only the positioning device at the first mold position A will be described. In the figure, reference numeral 44 denotes a movable platen of the injection molding machine 42, which has a first mold position A and a second mold position B. Reference numeral 48 denotes an insert set in the first mold position A, 71 denotes a fixed platen of the injection molding machine 42, and a first injection device (not shown) is provided on the right side of the fixed platen 71 in the drawing. It is arranged.

The fixed mold 1 is mounted on the fixed platen 71 via a fixed mold mounting plate 72. The movable mold 2 is attached to the movable platen 44 via a movable mold mounting plate 74 and a spacer block 75. Reference numeral 6 denotes an upper ejector plate, 7 denotes a lower ejector plate, 18 denotes a return pin, and 19 denotes a spring surrounding the return pin 18. When the upper ejector plate 6 and the lower ejector plate 7 are pushed in the direction of arrow F by an ejector rod (not shown), an ejector pin (not shown) protrudes a molded product and releases the molded product from the movable mold 2.

In this embodiment, the insert 48 is constituted by the movable mold mounting plate 74, the upper ejector plate 6, the lower ejector plate 7, and the movable mold 2, and can be handled as an integrated cassette. , The nest 48
Is a preset movable member on the movable side, in this case,
It can be attached to and detached from the movable platen 44.

For this reason, a first arm 78 is formed at the upper end of the insert 48 and extends to the upper end surface of the movable platen 44.
A first positioning pin 79 as a positioning projection is provided so as to protrude downward from the first arm 78. In addition, a pin hole 80 for inserting the first positioning pin 79 is formed on the upper end surface of the movable platen 44. When the first positioning pin 79 is inserted into the pin hole 80, a slight clearance is formed between them.

A second arm 82 is formed at the lower end of the movable platen 44 and extends to the lower end surface of the insert 48. The second arm 82 serves as a positioning projection so as to project downward from the insert 48. Two positioning pins 83 are provided. The second positioning pin 8 is provided at a position of the second arm 82 corresponding to the second positioning pin 83.
3 is formed. The second
When the positioning pin 83 is inserted into the pin hole 84, a slight clearance is formed between them.

As described above, the first positioning pin 79 is inserted into the pin hole 80, and the second positioning pin 83 is inserted into the pin hole 84.
By inserting the insert 48 into the movable platen 44, highly accurate positioning can be performed. Further, if necessary, the chamfered portion 8 is formed in the pin hole 80.
0a is formed, and the positioning pin 79 is guided by the chamfered portion 80a, so that positioning can be easily performed. Note that a chamfered portion can also be formed in the pin hole 84.

The first positioning pin 79 and the second
The positioning is performed by the positioning pins 83, and at the same time, the insert 48 is prevented from dropping from the movable platen 44 due to the force in the direction of arrow F when the molded product is ejected. It should be noted that the present invention is not limited to the above embodiment, and various modifications can be made based on the gist of the present invention.
They are not excluded from the scope of the invention.

[0039]

As described above in detail, according to the present invention, a mold changing apparatus for an injection molding machine includes a platen and at least a movable mold, and is selectively mounted on the platen. It has a nest and a mold exchanging means for attaching and detaching the nest to and from the platen. Then, ridges and grooves for guiding the nesting are formed on the nesting and the platen along the insertion direction, and projections and holes for positioning the nesting are formed.

A molded product is formed by filling a resin into a cavity formed between the fixed mold and the movable mold. Also, when molding a molded article having an insert or when exchanging a mold, the insert is detached by the mold exchanging means. A projection is provided for positioning between the insert and the movable member. Therefore, when the nest is set at each mold position, the nest is positioned with respect to the movable member by the projection. In this case, positioning can be performed by simply inserting the protrusion into the pin hole, so that the nesting can be easily mounted, not only can the mold replacement work be simplified, but also the work cost can be reduced. Can be done.

In the case of molding a plurality of colors or a plurality of materials, a plurality of injection devices are provided corresponding to a plurality of injection molding machines provided on the positioning frame. A plurality of mold positions are formed, and a fixed mold, a fixed platen, and a movable platen are provided at the mold positions.
Therefore, the resin can be filled using each injection device at each mold position.

A nest including at least a movable mold is commonly provided for each injection device, and the nest is used by a mold changing means to set a movable member on a movable side at each mold position. Attached to and detached from. Accordingly, when the insert is sequentially moved to each mold position and the resin is filled by the corresponding injection device at the mold position, molding of a plurality of colors or a plurality of materials can be performed.

A projection is provided for positioning the insert and the movable member. Therefore, when the nest is set at each mold position, the nest is positioned with respect to the movable member by the projection. Further, when molding a plurality of colors or a plurality of materials, a single-color or single-material injection device or a two-color or two-material injection device can be used, so that the use efficiency of the injection device can be improved.

Further, by removing the injection molding machine from the positioning frame, normal molding by each injection molding machine can be performed.

[Brief description of the drawings]

FIG. 1 is a schematic view of a mold changing device of an injection molding machine showing an embodiment of the present invention.

FIG. 2 is a sectional view of a mold device of a conventional injection molding machine.

FIG. 3 is an explanatory view of mounting a nest in a mold apparatus of a conventional injection molding machine.

FIG. 4 is a schematic view of a positioning device in a mold changing device of an injection molding machine, showing an embodiment of the present invention.

[Explanation of symbols]

 Reference Signs List 1 fixed mold 2 movable mold 40 positioning frame 42,43 injection molding machine 44,45 movable platen 47 mold exchanging means 48 insert 71 fixed platen 79 first positioning pin 83 second positioning pin A first mold Position B Second mold position C Third mold position D Fourth mold position

Continuation of the front page (56) References JP-A-2-20314 (JP, A) JP-A-3-5114 (JP, A) JP-A-57-49058 (JP, U) (58) Fields investigated (Int) .Cl. ⁶ , DB name) B29C 45/26-45/44 B29C 33/00-33/76

Claims (2)

(57) [Claims] (A) a platen; (b) an insert having at least a movable mold and selectively mounted on the platen; and (c) attaching and detaching the insert to and from the platen. And (d) convexes and grooves for guiding the insert are formed in the insert and the platen along the insertion direction, and for positioning the insert. A mold exchanging device for an injection molding machine, wherein a projection and a hole are formed. 2. (a) a positioning frame in which a plurality of mold positions are set; (b) a fixed platen, a fixed mold and a movable platen respectively arranged in each of the mold positions; and (c). An injection device arranged corresponding to each of the mold positions; (d) a common insert for each injection device having at least a movable mold; and (e) presetting the insert. (F) that the nest and each movable platen are formed with a projection and a hole for positioning the nest. Die changing equipment for injection molding machines.