JPH0356165B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an injection molding machine equipped with a nest changing device.

(Problems of the Prior Art to be Solved by the Invention) Conventionally, when changing the molding setup of an injection molding machine, the entire mold is generally replaced. However, if a part of the surface of the molded product is different, the mold can be easily replaced by replacing only that part instead of the entire mold, and the advantage is that the manufacturing cost of the mold can be significantly reduced. There is. On the other hand, the part of the mold to be replaced (hereinafter referred to as the insert) is positioned with extremely high precision (maximum number + microns) relative to other mold parts (hereinafter referred to as the mold body). This is necessary. By the way, when inserting the insert into the insert mounting part of the mold body attached to the platen from above, insert the insert and the insert to the extent that positioning is completed by inserting the insert into the insert mounting part of the mold main body. If the insert attachment part of the mold body is machined with high precision, the insert cannot be easily inserted into the insert attachment part formed on the mold body, making it difficult to automatically replace only the insert. I couldn't escape this problem.

(Object of the Invention) The present invention was devised in order to solve the above-mentioned conventional problems, and uses an insert insertion guide to easily and easily insert the insert into the insert mounting portion of the mold body. It is an object of the present invention to provide an injection molding machine equipped with a insert changing device that enables reliable insertion and automatic replacement of the insert.

(Structure of the Invention) The present invention provides a mold body mounted on a platen.
A nest mounting part is formed that is open upward, and a nest guide surface that matches the inner surface of the nest mounting part is formed directly above the nest mounting part, and a guide for receiving the nest at the upper and lower ends of the nest guide surface is formed. A nest insertion guide is provided that has a sloped surface that can be sloped, and is capable of reciprocating between a separate nest storage box and the mold body insertion guide, and is capable of reciprocating between the nest storage box and the mold body. The present invention is characterized in that a nest transfer device capable of transferring the nest to and from the nest mounting portion via a nest insertion guide is provided.

(Embodiment) An embodiment of the present invention will be described below with reference to the drawings. In the drawing, 1 is a fixed platen of an injection molding machine, and a mold body 2 is mounted on the punch surface of the platen. The mold 3 is made by inserting and assembling the insert 4 into the mold body 2. The mold main body 2 is provided with an insert mounting portion 5 having a lip groove-shaped cross section.
has an open upper end on the insert insertion side, a stopper 6 is formed at the lower end, and a guide rail 7 is formed in the opposing groove. On both sides of nest 4,
A protruding strip 8 is formed with narrowed upper and lower ends.The insert 4 is inserted into the insert mounting portion 5 by sliding the protruding strip 8 on the guide rail 7, and the insert tip 9 is inserted into the insert mounting portion 5.
By pressing the mold body 2 against the stopper 6, the mold body 2 and the insert 4 can be combined to form a surface molding part of an injection molded product.

In order to easily and reliably insert the insert 4 into the mold body 2, the upper end of the insert 4 is provided with a chuck 11 of an insert transfer device 10, which will be described later, so that the insert 4 can be suspended in the insertion position. A hanging fixture 12 is attached to the upper part of the fixed platen 1, and a nest insertion guide 13 located directly above the nest mounting section 5 is mounted via a pedestal 14. The nest insertion guide 13 is
It has a lip groove-shaped cross section with an insert guide surface 15 that matches the inner surface of the insert mounting portion 5 of the mold body 2, and the upper and lower ends of the insert guide surface 15 have protruding strips 8 of the insert 4. a sloped surface 16 that can receive and guide the upper and lower ends;
17 is formed.

Reference numeral 18 denotes the base of a pedestal 14 installed on the upper part of the fixed platen 1, and a plurality of inserts 4 (three in the drawing) are arranged on the pace 18 located on the operation side or the counter-operation side of the injection molding machine. A retractable nest storage box 19 engages with a slide shaft 20 along the mold opening/closing direction at its lower part, and is movably installed by a cylinder 21. This nested storage box 19
A positioning notch 22 corresponding to the nest storage position (step) is formed on the side of the frame 1.
4, a positioning pin 23 is provided so as to be movable toward the positioning notch 22 by means of a cylinder 24. Thus, the nested storage box 19 is moved by the cylinder 21 every two pitches in the left direction in FIG.
Then, feed it 2 pitches to the right to return it to its original position, and the positioning is done using the positioning pin 23.
By engaging the positioning notch 22, it is possible to accurately carry out step feeding.

The nest transfer device 10 is mounted on the fixed platen 1 via a pedestal 14, and is capable of reciprocating between the nest storage box 19 and the nest insertion guide 13. 19 and mold body 2
The insert 4 can be transferred between the insert mounting portion 5 and the insert inserting guide 13. That is, the frame 1
4 is provided with a cross beam 25 extending in a direction perpendicular to the mold opening/closing direction, and two pole slide rails 26 are attached to the surface of the beam in parallel in the upper and lower directions. Two ball bearing receivers 26A are installed on the back side of the saddle 27, one on top and one on the bottom.
By engaging the ball bearing receivers 26A with the ball slide rails 26, the saddle 27 can be moved horizontally along the cross beam 25 by the transverse cylinder 26.
At the top and bottom of the surface of this saddle 27, there are chucks 11 that can be raised and lowered via a guide mechanism 30 by lifting cylinders 29 that have a built-in rod lock device.
A nest insertion guide 31 having the same configuration as the nest insertion guide 13 is provided. Check 11
For example, a locking protrusion 33 is formed on the lower end facing portions of a pair of left and right pawls 32 that can be opened and closed in the transverse direction of the saddle by a built-in drive device. The hanging fitting 12 provided at the upper end of the insert 4 has a locking recess 3 in which the locking protrusion 33 of the claw 32 can be engaged.
4 is formed.

Reference numeral 35 denotes a pair of left and right clampers, which are placed facing the upper part of the insert attachment part 5 of the mold body 2 and are attached to the presser cylinder 36.
It is attached to the upper part of the fixed platen 1 so as to be movable from the side.

(Function) The chuck 11 of the nest transfer device 10 is lowered to the nest storage box 19 through the nest insertion guide 31 by the lifting cylinder 29 to chuck the insert 4 used for injection molding, and then raised. and place it in the nest insertion guide 31. Next, the saddle 27 is moved by the transverse cylinder 28 to insert the nest insertion guide 31 into the nest insertion guide 13.
After the insert 4 is placed directly above the insert insert guide 13, the lift cylinder 29 lowers the insert 4 from the insert insert guide 31 into the insert insert guide 13. At this time, even if there is misalignment between the insert 4 and the insert mounting portion 5 of the mold body 2, the insert 4 is moved from the insert inserting guide 31 to the insert inserting guide 1.
3, it is pressed against the sloped surface 16 at the upper end of the nested guide 13, and is inserted into the nested insertion guide 13 along this sloped surface 16. At this time, the nest transfer device 10 receives a lateral force as a reaction force from the slope surface 16 via the nest 4 and the nest insertion guide 31, so the nest transfer device 10 performs an automatic correction operation. , the insert 4 is the insert insert guide 1
3 and descends along the insert guide surface 15, and is inserted into the insert mounting portion 5 of the mold body 2 by the guide positioning action. Therefore, the nested transfer device 1
Positioning of the insert 4 using 0 can be done with rough accuracy.

The inserted insert 4 is held by the guide rail 7 in the insert mounting part 5 of the mold body 2, and is held in pressure contact with the stopper 6 by the clamper 35, so that the insert 4 is connected to the mold body 2 and the surface molded part of the injection molded product. and is ready for injection molding.

The chuck 11 of the nest transfer device 10 is housed in the nest inserting guide 31 at the transverse position where the nest 4 is inserted, and is kept on standby.

After the injection molding is completed, the clamper 35 is moved back to release the clamp on the insert 4, and then the lifting cylinder 2
9, the chuck 11 is passed through the insert insertion guide 13 and lowered, and then the old insert 4 is chucked. Next, after raising the chuck 11 and placing the old insert 4 through the insert inserting guide 13 into the insert inserting guide 31, the chuck 11 is lowered after traversing and is opened to empty the insert storing box 19. into the space where it was placed and raise it again. Next, the positioning pin 23 is pulled out from the positioning notch 22 by the cylinder 24, and the nest storage box 19 is moved 1 direction to the left in FIGS. 4 and 5 by the cylinder 21.
After the pitch is moved, the positioning pin 23 is inserted into the positioning notch 22 to perform positioning. Next, after lowering the chuck 11 to chuck the new child 4, the chuck 11 is raised and placed in the nest insertion guide 31, and the new child 4 is chucked by the above-described procedure.
is set in the insert mounting part 5 of the mold body.

If the above operation is performed automatically and in a short time by the control device, and the insert 4 is automatically replaced, the operation rate of the injection molding machine can be improved.

In this embodiment, the nested transfer device 10 is placed on the top of the fixed platen 1. However, the mounting of the nested transfer device 10 is not limited to the top of the fixed platen 1. Instead, it may be placed on a pedestal placed in parallel to the fixed platen 1, and it goes without saying that it can be provided not only on the fixed platen 1 side but also on the movable platen side.

(Effects of the Invention) As described above, the present invention is a method in which the insert is taken out from the insert storage box by the insert transfer device and inserted into the insert mounting portion of the mold body from above. The insert insertion guide installed directly above the insert mounting part guides the insertion of the insert into the insert mounting part of the mold body with high precision, so the insert can be inserted reliably without using expensive precision robots. And it can be done quickly. Furthermore, regardless of the presence of the insert insertion guide, the insert can be easily taken out from the insert mounting portion of the mold body and returned to the insert storage box. Therefore, it is possible to fully automatically replace the insert, which greatly improves the efficiency of mold changing work, and also allows several injection molding processes to be performed sequentially and sequentially using inserts prepared in the insert storage box. This can improve the operation rate of the injection molding machine. This is particularly effective when producing a wide variety of products in small quantities. Furthermore, since there is no need to use expensive precision robots, equipment costs can be reduced in combination with the adoption of the nesting method. Further, the insert changing device can be installed compactly on the injection molding machine. There is no need to use expensive precision robots to replace the insert. In addition, by adopting the above-mentioned insert insertion method, there is no need to connect the mold temperature control piping, wiring, Coretra hydraulic piping, etc. required for the entire mold replacement method, and the insert can be quickly attached and removed. The efficiency of replacement work can be greatly improved.

[Brief explanation of drawings]

Figure 1 is a front view showing one embodiment of the present invention, Figure 2 is a front view showing one embodiment of the present invention;
The figure is a partially enlarged view of Fig. 1, Fig. 3 is a plan view of Fig. 2, Fig. 4 is a right side view of Fig. 1, Fig. 5 is a partial plan view of Fig. 4, and Fig. 6 is a chuck. FIG. 3 is a front view showing the insert in a chucking state. 1...Fixed platen, 2...Mold body, 3...Mold,
4...Insert (projection section...8, lower end of insert...9, hanging bracket...
12. Engagement recess...34), 5... Insert mounting part (stopper...6, guide rail...7), 10... Insert transfer device (chuck...11, nest insertion guide...1)
3. Frame...14, Base...18, Cross beam...
25, Pole slide rail...26, Ball bearing receiver...26A, Saddle...27, Traverse cylinder...28, Lifting cylinder...29, Guide mechanism...
30, nest insertion guide... 31, claw... 32, locking protrusion... 33), 19... nest storage box, 20... slide shaft, 21, 24... cylinder, 22... positioning notch, 23... positioning pin, 35... Clumber, 36...presser cylinder.

Claims (1)

[Claims] 1. A mold body attached to a platen is formed with an upwardly open insert mounting part, and immediately above this insert mounting part, a nest guide surface that matches the inner surface of the insert mounting part, and the insert A nest insertion guide having sloped surfaces capable of receiving and guiding the nest at the upper and lower ends of the guide surface is provided, and is capable of reciprocating between a separate nest storage box and the nest insertion guide, The insert changing device is further provided with a insert transfer device capable of transferring the insert between the insert storing box and the insert mounting portion of the mold body via the insert inserting guide. injection molding machine.