JPS59184634A - Mold for injection molding - Google Patents

Abstract

PURPOSE:To prevent the remaining of a cured resin in a nozzle bush by smoothly operating cutting block by small driving force when a gate is cut by the cutting block from a shape before the shape is extracted from the inside of an injection molding mold. CONSTITUTION:After an injected resin cures, and a film gate G is cut by retreating and moving a cutting block 13. The resin S is extracted easily from the inside of an injection port 11 because the discharge port 11 inclines at an angle of theta deg. in the direction of retreat of the cutting block 13. Rotation moment shown in M works to the resin S to facilitate the extraction of the resin S. The center of an ejector pin 18 and the center of a working pin 27 coincide on the completion of cutting. A mold is opened, an extruding pin extrudes a resin product W from a cavity die proper 1 and thrusts it out, the working pin 27 is in contact with the ejector pin 18 a little later, and a runner R and the gate G are extruded from the cutting block 13.

Description

[Detailed description of the invention]

In the present invention LL, the C/gate inside the mold is cut out from the resin product. J: Involved in injection molds for Unishita. To index mold resin products of various shapes, it takes 10 tons/pi)
This is done by indexing and filling the thermoplastic resin in a heated and molten state into the product molding part formed in the injection molding metal 11 (made of -Idai main body and -L Adai wood body.Such injection molding In the mold, an IC is connected to the main body of the injection machine to heat and melt the resin and then apply pressure to it.
The resin is filled into the product molding part from the nozzle bushing, and when the resin filled in the product molding part hardens, the resin in the launch part that connects the injection sprue at the tip of the nozzle bushing 1 and the gate also disappears. Since it will be hardened, this is the gate, that is, the end part of the ramp 'C:
IJ! You need to pay 111 for 1 item. Fig. 1 shows a state in which a resin product W having a U-shaped cross section is taken out from an injection mold together with a lamp R and a gate G. The mold for injection molding is as shown in Figure 2.3. For the injection molding metal, place the fixed side -Vt-Bj-I die on the movable side and the Adie main body 2' on the right side, and mold them together as shown in Figure 2. A product molding section ("t+bitey") 3 is formed therein. The main body 1 of the Yatohifuitai is fixed to a plate 5 via a spacer 4, and an injection molding machine main body (not shown) is attached to the plate 5 (J l).
It is being , -1j' is fixed to the mounting plate 7 via the spacer 6, and a drive device (not shown) is installed on the plate 7, and the core die main body is 1-+7 Biteidai Kikyu 1 approach/departure movement 57
A runner I[-J] is installed between the nozzle part 8 installed on the mounting plate 5 and the nozzle pusher 19 with a step number on the levity die body 1. The molten resin that flows out from the main body of the indexing molding machine in the figure I to the nozzle part 8 is transferred to the lamp tube [ ] pusher 10 and the nozzle pusher: 19.
1, which is adapted to discharge from the injection L (sprue) 11 provided at the tip of one nozzle through the nozzle.

[A heater 12 is installed in the J-tuck 10 and the nozzle pusher 19 to prevent the resin flowing therefrom from solidifying.] ::I '77' The 10 cutouts 13 are attached to the main body 2, and the 10 cutouts 13 and 1 (1) are attached to the main body 2 of the cutout 7. Along the longitudinal direction of the meat C and the resin product, long width gussets 1 to G, that is, 7C rum gates G are formed, and a return R is formed that connects these noil guss 1 to G and the injection [ ] 11. Further, this cutting block 13 is provided with a cutting edge 14 facing the end surface of the product forming part 3 and having a thickness of 1, excluding the thickness of the filler. 11i
Since the block 13 moves forward and backward in the direction perpendicular to the direction of approach and departure of the core die body, it is fixed to the pole 1 to the -1 tie body 2 by 15 and a hydraulic cylinder 17 is attached to the bracket 16 ( In detail, the screw 1 of the hydraulic cylinder 17 [the head 171 formed at the tip of the Jrad 1 fa] is formed on the cutting bush [ ] push 3.
After the resin molding, the IC runner R and gate G remaining in the cutting block 13 are removed from the cutting block 3 and covered with the 1-dijector turbine 18. A flange portion 19 formed on the Niji 1 unit 18 and attached to the
Due to the spring 20, the tip of the lid bottle 18 is cut off and the surface of the pusher 3 (
Forming a run J)
The elastic force f=I is applied to the lid bottle 18. 1 ] Ataiho body 2, spacer 6 and mounting plate 7 are surrounded by 1. : Inside the space 21, an extrusion plate 22 is stacked and placed between the extrusion plate 22 and the core die body 2.
H-,:] By the spring 23, the extrusion plate 22 is
An elastic force directed toward -24 is applied to the shaft fixed to the plate 7. On this extrusion plate 22, a one-turn pin 25, an extrusion pin 26, and an operating pin 27 are attached (;i G
I'm getting fucked. Incidentally, in order to fix the extrusion plate 22, the J-turn bin 25, etc., the IQ is made by joining two plates together. . After the molding of the resin product W is completed, it is driven by a drive device (not shown).
No tie main body 2 is l: t bij I die main body 1 h) and the extrusion plate 22;
A through-hole 29 is formed in the mounting 117 so that the extruder 1:28 can enter and exit the side, and the extruder 28 has a drive device 1. When the die main body 2 is separated 1e f)+, the extrusion rod 28 comes into contact with the extrusion plate 22 and pushes it, so that the extrusion plate 22 moves in the opposite direction with respect to the die body 2. It is meant to be covered. The extrusion bottle 26 is for taking out the molded resin product W from the core die body 2 by moving the extrusion plate 22, and the operating pin 27 is for moving the ejector turbine 18 by 1'l. , the return pin 25 is for ensuring that the extrusion plate 22 returns to the state shown in FIG. 2 when the die body 2 is brought into contact with the cavity die body 1. However, ``this type of conventional indexing molding machine''
It is clear from FIGS. 2 and 3 that the resin discharged from the injection port 11 is discharged in the same direction as the moving direction of the injection port 11, and the resin is discharged from the front end of the injection port 11. is located on the same plane as the mating surface of the cutting block 13 and the caviar C die Kikyu 1, so after the resin filled in the product molding part 3 hardens, it will not attack the cutting block 13. When the gate G is cut by the cut end 14 of the cutting block 13 by moving backward, there is a problem in that the resin S in the @-1iH++ 11 creates a large resistance to the backward movement of the cutting block 13. Then, Q'l !, lt [:
When the length of I 11 is cut, the resin S in 11 receives a shearing tip (-cutting point #l from the run-off-R at the beginning of posting). t, c
01ilfull There is a risk that the cured resin will remain in 11.
When this happens, the tip of the molten resin inside the nozzle bush approaches the dividing surface of the cutting tool 13, and the heater 12 no longer heats that part, causing the resin inside the nozzle bush to harden. l)C There is a problem that the next resin molding may become impossible.The present invention has been developed in view of the problems of the prior art such as [)
1 After molding a resin product in a mold for molding, before removing the resin product from the mold, when cutting the gate part from the resin product using the cutting zo 1 cock 117i , the cutting zo []
The purpose is to improve the efficiency of injection molding by allowing the nozzle to operate smoothly with a small driving force and by preventing hardened resin from remaining inside the nozzle bush. The structure of the present invention to achieve such an object is to form a product molding part between the die body and the die body which can move toward and away from the die body, and to discharge molten resin. The nozzle bushing has an injection port formed therein, and a lunch connecting the gate and the injection port 1-1 is attached to the cutting bush formed between the =1 tobitity tie body.
The J-tuck is attached to the core die body so as to be movable forward and backward in a direction transverse to the approaching/separating movement direction, and is inclined in the retreating direction of the cutting/LJ-tuck with respect to the approaching/separating moving direction. 1 was formed.
. Next, an explanation will be given based on a practical example of one defense shown in FIGS. 11 to 6. In Fig. 4.5, the parts that are common to the parts in the mold for q1 extrusion molding from 1g shown in Fig. 2.3 above are given the same symbols. The product molding section 3 is formed between the kitopity tie main body 1 and the core die main body 2 which can move towards and away from it, and has an indexing opening (sprue) 11 for discharging molten resin.
The nozzle bushing 9 formed with t: is attached to the t:p bifitting body 1 (=1 is attached.) Also, the 1i7J section 9 that forms the ramp R with the -1:: ty bifitting body 1 is attached to the 1i7J section ``]''. 13 is 1 Tsunodai Mizukyu 2's approach #1 Can be moved forward and backward in the direction of 'iiJ angle with respect to the opposite direction of movement - J Mounting number J on the Tsunodai tree body
There is C. As shown in Fig. 1.5, the injection ril 11 is mmθ° (,5...20' ) An inclined horn (formed, however, the front end surface 30 of the index 1111 in the 0.1-output mold shown in FIG. Therefore, on the front end surface 30 of the indexing port 11, a downward dew surface with a quality a is formed between the front intersection Δ with the lamp R and the rear intersection B. Next, the effect is shown in Figure 8.
Referring to ~)') To explain, Mari゛, 4 of the start of molding
Press the B button to move the core die body closer to the core die body 1 so that the mold clamping is no longer possible. and in history
A predetermined push (-j tJ force is applied to the ager main body 2 against the tt/bijr tie main body 1 ('?? pressure - ■ degree). Nire 1
．． - The resin in a molten state is filled into the product molding section 3 through the ramp and through the goo t-G. , Jl) The first culm is I
': I''L resin is hardened,] is applied to the core die body (the pressure is released by about 1-degree pressure), and the hydraulic sill 17 cuts the cutting flock 13 at almost right angles to the direction of movement of the core die body 2. As a result, the cutting blade 14 of the cutting block 13 and the T-tsuji of the main body 1 work together to
The G part is cut. The cutting block 13 moves backward and shows the lζ state as shown in FIGS. 1 and 6. At this point, the resin S in the injection port 11 is pulled by the cutting block 13 as it moves backward; It will come out from inside the injection port 11. In addition, the front end surface 30 of the index [ ] 11, that is, the injection port 11 and the cutting tab [ ]
Since the dividing plane with Tsuku 2 is inclined by α°, the tree 11t'
There is no shearing force 'C' applied to the interface between fS and lumf R, and the resin S has a number of turns indicated by M in Fig. 5.
17i1-men1- promotes action 1, deformation of resin S,
Even more mouth'I i, I:t 1. :', the resin S in 111 can be easily removed. At the time when the uJFlil culm is completed, in J3, the center of the rainbow T turbine 18 and the center of the operating pin 27 are aligned. After that, by using a drive device (not shown), move the -°]7 die Kikyu 2 from the die body 1 to the N1 inverted μ shape. When the mold is opened, the extrusion pin 28 is pushed out, and the extrusion plate 22 is moved toward the cavity die body 1 side. The product is ejected with
Ji! : Contact with the lid bin 18 (Lump R and gate G are cut t17i - f [1 is extruded from 13.) At this time, when the resin product W is taken out from the mold, 0 and the lump R can be reliably removed from the mold, making it possible to perform smooth injection molding continuously.Next, after the extrusion rod 28 is completely retracted, the cutting block 13 is moved to the second Returning to the position shown in Figure 3, 1 cycle of injection molding is completed, and the next injection molding can be started.At this time, first, due to the elastic force of the coil spring 23, the extrusion plate 22 is The actuating pin 27 will be separated from the 1-direction cylinder 18, and the core die body 2 will be separated from the tF.
The cutting block 13 can return to the position shown in FIG. 2 before contacting the bitty die body 1. FIG. 7 is an enlarged sectional view of the main part of another embodiment of the indexing mold of the present invention, in which the front end surface 30 of the injection port 11 is formed into a stepped shape by a horizontal portion 31 and a vertical portion 32. There is a type C, and the other structures are the same as those in the previous embodiment. Note that, if the direction of movement 17Jtj of the cutting block 13 is =] a direction transverse to the direction of movement toward and away from the core tie body, depending on the shape of the product W, the culm may be inclined at a certain angle with respect to the direction of movement shown in the figure. It is also possible to move in the direction Fl+. In addition, the scales for Goo]-G may be 61 No. 1 Goo I~ in addition to the film gate. Furthermore, in the illustrated embodiment, the bit die main body 1 is replaced with gold 3" on the fixed side, but
-] It is also possible to mold the core tie body into the fixed side mold C
be. According to the present invention as described in -1, a product forming part is formed between the -1 tohitei die Kikyu and the core tie main body which can move toward and away from the core tie body, and the molten resin is discharged.
Take the nozzle 1, which has an injection port formed therein, into the die body and press the index [
A cutting block formed between the runner Shio \ said Ki I7 Bi1 I die body connecting the runner 1 and 1 is attached to the core tie body so as to be movable forward and backward in a direction transverse to the approach and separation direction 01; The injection port is formed with an inclination U in the direction of the retreating force of the cutting block with respect to the direction of near-separation/reverse movement of the above-mentioned 1. [] Goo by Tsuku 1 ~ Cut jli LL
'i IJ O (Jru cutting) The 0 load to the rl link becomes smaller, and the goo is more reliable before the small f1].
I can write. First, since increasing the length of the injection tube has the effect of greatly simplifying the installation of a heater for heating the molten resin in the nozzle brush L, it is very easy to install the heater. t be beaten.

[Brief explanation of drawings]

Fig. 1 is a perspective view showing an example of a resin product molded by indexing, and Fig. 2 is a conventional injection molding metal plate! Accept the cross-sectional view,
Figure 3 is an enlarged cross-sectional view of the main part of Figure 2, and Figure 4 is the present invention.
FIG. 5 is an enlarged cross-sectional view of the main parts of FIG. 4, and FIG. 6 is an enlarged cross-sectional view of four main parts showing a state in which the cutting pin [1] is retracted. , FIG. 7 is an enlarged cross-sectional view of main parts of a mold for molding 04 according to another embodiment of the present invention, and FIG.
The figure shows the molding process of the present invention 4) [''-chitr-l-'
There is C. C...gate, R...lamp, S...mouth 4 +
) + Resin in n, W...Resin product, 1...Kitobitei die body, 2...] Core tie body 3...Product molding part, 11...Injection 11 21.13... Cutting tab [1
Tsuku, 14...Cutting blade, 17...One oil cylinder, l Fig. 7 Poor Q

Claims (1)

[Claims]: Forming a product molding part between the V'tobii itai main body and the Agui main body which is movable towards and away from the main body;
Attach the nozzle pusher 1, on which the index [1] for indexing the molten resin is formed, to the T-TY bi-iC die body.
The lunch connecting Goo 1~ and the injection port is i'vl P
The cutting block formed between the cutting block and the die body is moved in the direction Ii that crosses the approaching direction 111 in the anti-movement direction. 1
4: J, said cutting 10 with respect to said approach-1 anti-movement direction
1) The injection mold is tilted in the Q direction and the injection port is formed.