JPS58197031A - Detector for defective thickness of injection molding - Google Patents

Abstract

PURPOSE:To obtain a detector for defective thickness of an injection molding, which is free of operational failure and can be easily fitted with a multiple cavity mold, by providing a specific detection unit between a mobile mold with a sliding hole leading to each cavity and an ejector plate. CONSTITUTION:The tip of the detection rod 21 of a detection unit 11, projecting into each cavity 4 under unfilled condition, is pushed by the pressure of molten resin. A web spring 24 is elastically deformed into a nearly flat plate form, the tip of the projection of the rod 21 is contacted with a pressure-sensitive portion, and electric current flows through an electrode 29, a pressing portion 28, and the projection 23 from a lead wire 30 to the portion 2 and 3. In case where the cavity 4 is not filld with molten resin injected, the detection unit 11 does not work because the rod 21 is not pushed. After the mold is opened, the ejector does not work, a molding of defective thickness is stilled adhered to the molds, and the injection molding machine is stopped under said condition.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an apparatus for detecting underfill defects in injection molded products.

Conventionally, as shown in FIG. 5, this type of underfill defect detection device has a sensor between a detection plunger 101 passed through a mold 102 through 4 Wis and a limit switch 104 disposed outside of the plunger 101.
The outer end of this detection plunger 101! An arm 107 integrally provided with a pin 106 in contact with the arm 101a is movably supported by a spring 108 acting between the arm 107 and a base plate 105 to operate the limit switch 104 behind the arm 107. An adjustment spring 111, an adjustment nut 112, and a port 110 are connected to the free end, and the tip of the detection plunger 101 projects into the cavity of the mold 102. Therefore, the mold cavity is filled with 91, etc., and the pressure causes the detection plunger 101 to move outward.
11, and its movement is taken out as a signal by a limit switch 104 or the like to detect filling. However, when trying to actually introduce this system, which has been established as a prototype as described above, into the field, it becomes difficult to use, for example, multi-cavity (4-cavity to 32-cavity) molds for molded products, especially small parts. If you try to attach the above system to the mold,
For example, in the case of a 16-cavity mold, it is necessary to install 16 limit switches 104, but it takes up a lot of space, and the mold itself has the disadvantage that the number of cavities increases and the 4 degree angle decreases. In addition, rust occurs due to leakage of mold cooling water and condensation water caused by cooling the mold, causing the ejection plunger 101 and the mold 102 to become attached, causing fingers, etc. on the bite side to overlap inside the mold cavity. The detection plunger 101 may not operate even if it is filled.

The present invention has been made in view of the above-mentioned conventional drawbacks, and is an injection molded product which is free from malfunction due to the detection plunger and which can be easily attached to a mold for molding a large number of small injection molded parts. The object of the present invention is to provide a meat defect detection device.

Next, one embodiment of the present invention will be explained using a leap line. Shizuku Naka 1 is a mold for injection molding of many parts, and it is possible @
mold 2 and fixed mold 6), and the mating surfaces of both molds 2 and 3 have cavities that align with each other and mold several parts (eight pieces are shown in the wooden example). Tees 4 and 4' are playing the role of plastic. Unfortunately, each cavity 4 of the movable mold 2 is provided with a JW hole 5 extending to the back side of the mold 2.

Reference numeral 6 denotes a defect detection device attached to the back side of the movable mold 2. This device 6 also has the function of taking out molded parts, and includes a plurality of detection units 11, upper and lower ejector plates 7, The upper and lower ejector plates 8 are connected in the shape of a single piece and are provided so as to be able to move backward independently with respect to the mold 2 via a ram or the like. Further, the upper ejector plate 7 is provided with a recessed mounting part 9 at a position aligned with the sliding hole 5 vertically provided in the mold 2 so that the detection unit 11tl can be fitted therein. In the same gate part 9, there are holes 10 that are aligned with the sliding holes 5 and that allow the detection rods 21 of the detection unit 11 to be inserted.
The detection loft 21 of the detection unit 11 is inserted into the hole 5 of the movable mold 2, and the detection loft 21 of the detection unit 11 is inserted into the hole 10 and inserted into the lower ejector plate 8. It is shaped so that its tip slightly protrudes into the cavity 4.

Next, to explain in detail the above-mentioned unit 11, 12 is the unit main body, which is formed from a conductive metal material in the shape of a circle, and a lid 18 is screwed to one end of the unit 11. A threaded portion 13 is threaded. Further, a flange portion 14 is provided protruding from the inner peripheral portion of the unit 7) book 112, and a concave portion 15, 16 is formed as a border of the flange portion 14. In addition, a hole 17 is formed on the concave @16 side (d) through which the lead @50 is inserted directly to the outer periphery. The circumferential portion is formed with a guide hole 19 that slidably guides the detection rod 21, and the unit body 1 has a diameter larger than that of the guide hole 19.
A female screw portion 20 is formed to be screwed into the screw portion 15 of No. 2. 211d A detection rod of the detection unit 11, which is formed into an annular body having a predetermined length from a metal material having four electric properties, and has a base that can be slid into the concave portion 15 of the unit body 12. Once the flange portion 22 to be enclosed is formed, a protrusion portion 23 of a predetermined length having a spherical portion at the tip is formed on the flange portion 22 .

24 Fl: A web spring housed in the 1l-rlif section 15, which is formed into a road surface shape as shown in the figure by bf''11, etc., and has a detection rod 21 in its center.
A hole 25 is provided through which the protrusion 9 23 can be inserted, and is formed so as to be elastically deformed into a flat plate shape within the concave portion 15 when external force is applied, as shown in FIG. The web spring 241d thus formed is housed in the concave portion 15 of the unit main body 12, and the protrusion 26 of the detection rod 21 is inserted through the web spring 24 so that the flange portion 22 is aligned within the concave portion 15, Female thread part 2 of lid body 18
0 is screwed onto the threaded portion 13 of the unit main body 12, and the flange portion 22 is enclosed within the field portion 15 to form the locking rod 21.
is added with +q (Heru. Like this, 2!! is added with f
When an external force is applied to the end of the output rod 21r, the web spring 24 elastically changes and moves, and when the external force is released, the restoring force of the web spring 24 restores the original device. One piece is formed so that it can be bent.

Note that during normal operation: the detection loft 211 is the spring 24
Yoshikunfu 18's Satsusen 1st page IC:・Oka! The throat of the cane (26 inch) is made of an ambiguous broken size such as a joint bite, and has a plate shape that fits into the field part 16 of the unit 12 as shown in the figure. At the same time, one hole 27 is formed in the ear portion of the tduni7), which aligns with the inner circumference of the flange portion 14 of the td 12. In the holder 26 formed in this way, -im pressure parts 28 and 41' @ 42
9 is (c) fitted. These pressurizing parts 28, . 1・1
1111 is made of m-pressure rubber and is formed into a disk shape with a slightly larger diameter in the holder 26 so that it can be inserted into the holder 26. The 29 souls are made up of 41 sour IJ bodies.
It was stored in the holder 26 and was used in the 71st pressurization 2B for 147 hours, and was inoculated with the lead FF130 and the emergency warrant. Like this - '7r + child 28 and r tomau''!'2
9 to 7 students, elementary school, 7L/X ~ 261 units, 7 units, 12
・Concave evil 16 and iμ2 enjoy. At the same time, the outside A eye: is synthesized with t and -. "Meet me" rP 16 has 4 camellias (
It is enclosed in. In addition, this prisoner, the rod for turret 21
■ Detail 28 due to spring 24 at the end of the key 23
[In ``1 byo'' by Nobuhiro Kashi] I am a man.

The detection rod 21 of the single bud extrusion unit 11 that was sniffed and killed is located in the IJU section 9 where the upper ejector temporary 70 is attached to the hole IDV! - The bridge is passed through and the insertion hole 'X1' is fitted and assembled via the lower ejector plate 8, and
Each detection rod 21 (each 4 @ hole 5 VCs of Shimachiso extra type 2)
It was passed, and the first thing that happened was Gabite (-...'.

It is provided in a slightly protruding shape within 4. Moreover, this rainproof mold 2 is fixed to a movable frame 32 and is moved back and forth with respect to the fixed mold 6. It is integrally moved backwards and is provided so that it can be moved back to EIT and 2 IC via a ram or the like.

Next (・, 3 turbidity (1> (1) l is a circulatory diagram (8 pigeon lofts) with defective underfilling, and Figure 3 (1) shows the presence of defective underfilling. This is the 1st link that monitors the 3rd m path (1> is each detection unit) MA to j1H in case of a failure.A fuse is connected to the C current source through section @33. , after passing through main switch 4-54, pilot lamp YL is connected in parallel, and normally closed is connected to each relay R11~ from tun RX.
R18 and each of the detection units 11A to 11H are inoculated in the same row in correspondence with each other, and each relay R11 to R18 is inoculated with an anti-adhesive lamp GL in parallel, and each of the detection units 11A to IIH is inoculated with 4- j Normally 7 points R11aj~R+BaI force for self-holding of each relay R11~R18; 4 bits are engaged in parallel each. In addition, 1. When RY and relay R3 touch 1c and 1j, R3 is a normally closed contact. R
9 is connected to M'l: via X to the contact point RY. Amata 1, (-Relays R18a2 are connected and connected in series in correspondence with each other, and R21&~R2Ba is always closed, which connects the self-maintenance of relays R21 to R28. From the reset switch LSI, set #1 to the normally closed valves R~R3 and Ada TQ series RHa2~RIFta2, respectively.
4, and the red lamp RL is on each relay R.
21 to R2B in parallel. Also,
Normally closed connection +g, R21b~R' in the same system that is independent of the above
)F3b 2yo Tsuka Souo Empress R11a5~RIBa3:;
z Jek p-vv-F, E:v! -:'1 row [4 encounters, mafc normally-contacts R21o to R2p'B and normally open contacts R11cL3 to RIFIL3 and # row K lyse 7)
If f L S 2 is connected as a normally open contact.

The operation of this embodiment, which has been made steeper as described above, will be explained below. As the #1 general injection deformation machine, we first created the fixed mold 3111i.
The mold 2 is moved, and both the molds 2 and 3 are clamped.

In this mold-clamped state, as shown in the 41st closed G (), the melting finger is unfilled, so the base end of the detection rod 21 of the assembly unit 11 is biased against the web spring 24. Then, when the melt P4@fat is injected and filled into each cavity 4, the detection rod 21 is fibrillated by the lucid pressure. The web spring 24 is strongly deformed into a substantially flat plate shape, and the tip of the protruding portion 23 of the detection rod 21 is brought into contact with the pressure @ 21 (participating in Figure 4 (b)), so the turbulence is caused by the lead @ 30. From there, the mold 2 passes through the detonation section 29, the pressure section 28, and the protrusion section 26.
6 or (flows to ejector plate Otsu 8. The above detection units 11A to 11H attached to each cavity
When activated, each relay R11 to R18 is energized, the normally open contacts R11 to R18 are turned ON, and each relay R11 to R18 is turned on.
18 is self-held and connected to ejector relay REJ.
i! Preparation for 1 set is completed. Each coloring lamp is also lit at the same time, and the operation of each detection unit 11 can be controlled.Next, after cooling for a certain period of time, 0J@mold 2 is separated from the fixed can and mold 6. The mold is opened in conjunction with the direction, and then
Is the ejector operation that is the ejector function of the Wakukame-yoshi-shaped parts to the ejector relay REJ1? Let's do it. The fourth fork (c) shows the state in which the ejector plate Otsu 8 has advanced and is ejecting the molded part, and the fourth fork (c) shows the state in which the ejector plate Otsu 8 has retreated, but each Detection rod 2
1 (d) Due to the resistance of the increasing hole 5, the tip part remains slightly protruded into the cavity 4.Next, the mold 2
moves to the fixed mold 3 side and is clamped again, but in the mold clamping operation, just before both molds are clamped, low pressure mold clamping is used for the purpose of mold protection, and the 4th height L+E During mold clamping: It is common practice to clamp both molds sufficiently. At the normally open contact RX of this low-pressure mold clamping relay, the self-holding state of the circuit is released and the above operation is repeated again.

Next, when the molten resin is injected, if the cavity 4 is not filled, the detection loft 21 will not be pushed, so the detection unit 11 will not move, and as a result, the cavity 4 will not be filled. Since the green lamp does not light up and there is no power to the ejector relay REJ, the ejector does not close after the mold is opened, and the defective product with insufficient thickness remains attached to the mold, and the injection molding machine stops. .In a general injection molding machine, a buzzer sounds to notify the operator that there is a cycle/l/abnormality. .If the reset switch LS2 is packed, the REJ is energized, so defective products with insufficient thickness can be easily removed using the ejector @.

Next, the case where the discharge unit 11 causes a short-circuit failure will be explained in detail. Pigeon 3 '21 (1) The normally open contact RY of the injection relay closes due to injection, and relay R3
When an electric current is received, the relay R is self-held by the normally open contact R3, and at the same time, the normally open contacts R3 to R3 are opened. Then, when the molten I4# fat is filled by injection, relays R11 to R18 enter and the normally open contacts R11a2 to R18a2fq close, but the normally closed contacts R3 to R3 remain open. V-R21 to R28
doesn't work. When the injection molding machine enters mold clamping after the ejector works successfully, the low-pressure mold clamping relay enters, its normally closed contact also opens RX, and the self-holding of relay R3 is reduced by 1 or 4, so the normally open contacts R6 to R3 are close. Then, the normally open contact RY closes again due to injection, but in that 1..., the normally open contact R1
If any of 1a2 to R18a2 is closed, the corresponding relay among relays R21 to R28 will operate, and at the same time its red lamp will light up. Furthermore, the circuit of ejector relay RP2J will be opened by self-holding, so after the mold is opened. The evictor operation (does not occur).The reset switch LSI is provided to release the self-holding at that time.

The above state does not occur when the detection unit 11 is operating normally, but the above operation is performed when the exclusion unit 11 is short-circuited within the limit.

The cause of short-circuit in this shut-out unit is (r: 11 lead wire inside the mold, sheet 2 short-circuit failure inside the detection unit 6) There may be parts stuck inside the cavity after the jector is operated. However, in either case, the above circuit can be used to monitor and notify the operator of any abnormality.

As mentioned above, the detection unit of the underfill defect detection device B)
11'=There is a detection loft 21 inside the unit body 12.
The pressure part 29 and the pressurizing part 28 are completely fiber-free and internalized through the holder 26 and the blind lid 31.
The entire ejector unit 11 can be submerged and reduced, and since the ejector plates 7 and 8 or the first leaf mold 2 can be used as wires, only one lead wire is needed, so 4e pieces can be taken. The detection unit 11 can be attached to each mold 2° 31 as a horizontal hole which also serves as a side hole for dispensing the molded product through the ejector plates 7 and 8. Also,
Since the defective underfill detection device 6 (also serves as a device for extruding the molded product), for example, if the molds 2 and 3 are left unattended during the molding period and are to be reused, the extrusion loft 21 is fixed to the mold 2 by a guard. Even if there is f4 (C, hk
When the detection rod 21 of the detection unit 11 is operated as a device for removing the molded product, the detection rod 21 (of the detection unit 11) is blown away by the turbulence 5 of the mold 2, so the fixed state is released and malfunction occurs. It is possible to prevent ≠ 5.

In addition, I is constructed by combining the extrusion unit 11 and the ejector plate Otsu 8, and serves as a defective ejection device 6 for elongation and maintenance of the molded product. I gave an example,
For example, the detection unit 11 can be fitted into a multi-cavity mold, and in this case, it is more compact than the conventional detection plunger 101 in which a limit switch 104 is attached close to the detection plunger 101. It can be attached. ``i!, fC1 This Example 4 As an attached place for the chanting unit 11 (It goes without saying that it is installed in a place where the old molded product is likely to be lacking in thickness. Although the meat defect detection device 6 is attached to a movable mold in the example, it may be attached to a fixed mold.

Now, in the present invention, each cavity of a movable mold for molding a large number of injection hole-shaped parts is provided with a movement hole that passes through W to the back side of the core mold. In addition to arranging an ejector plate that connects with the cough metal 7, the
'Tl between the movable mold and the ejector plate K (the leading part is inserted into the narimachi hole of the retractable mold and protrudes into the cavity, and the convex end has a flange part and a protruding part. A detection rod having a chamber and a unit body attached to the ejector plate are connected to each other, and the core unit is elastically loaded via a web spring at the base end of the detection loft, and further A lead wire was connected to the unit main body through a holder consisting of an insulating part (the exposed part and the pressurized part were housed, and the detection rod was connected to the pressurized part via a web spring). By killing the detection units arranged in layers and applying injection pressure to each cavity, the detection rods of each detection unit are actuated and brought into contact with the above-mentioned seal portion 1. Since the injection bite-shaped Sakuyokui-go and the ejector plate are configured to take out the signal and v that operate independently of the @Jika-Hong mold, it is easy to use to check the quality of the injection molded parts. In addition, the molded parts can be taken out at the same time, and the broken detection unit has a detection loft and lead wire attached to the main body of the detection unit. Since it has 4 teeth, it can be printed and made smaller, so it can be extremely easily placed in a mold for multiple cavities, and it also prevents malfunctions due to rust on the side rod. Because it is possible to detect defects in injection molded products, it is like a dog in its beak.

4, '``'411I]'s Hayabusa
The d-moon cross section shows one embodiment of the present invention; (J) (W) is the electric turn vj of the defective underfill detection device, the fourth contract (a) (b) ()S
(-) is a sectional view showing a conventional example.

2...Movable mold 3...■U-mold 4.4'...
・Cavity 5...PPJ@hole 6...Underfill defect detection device 7, 8...Ejector plate 11・
...Detection unit 12...Unit body 2
...Detection loft 22...Flange part 23.
... Protrusion part 24 ... Web spring 26 ... Holder - 28 ... Pressure
Part 29...'
30...Lead Shrine Out
Hito Yamato 1'hi Seiko Nami Shiki Company Representative Hito Hiroto
Patent Attorney Oka 1) Hidehiko Figure 2 30/3, /! ÷ Sales, 4 3rd Art 4th (A 1
:. 4' W 1. /1 Figure 5 01 Procedural amendment j Book Showa! Wakasugi, Commissioner of the Japan Patent Office (11 Publics 1, 1937, 1933, 1933, 1935, 1983, 2013), Commissioner of the Japan Patent Office, Wakasugi, January 2, 1983, 1935, No. 2, No. 2, J-7P No. 3, Person making the amendment, Relationship with the case, Patent Applicant, 4, Attorney, 5, Amendment. Date of order 6. Number of inventions increased by amendment 8. Contents of amendment: As per the above court, Subject of amendment (1) Field of scope of request for permission (2) Column for detailed explanation of the invention in the specification (3) Column for brief explanation of drawings for clarity (4) Drawing 8 and content of amendments (1) The description in the “Scope of Claims” column is attached to the attached sheet. 2 corrections and 2.

(2) Ministry of Specifications, page 7, line 12 or line 13 [
...The holder 26 is fitted inside--The description reads, ``The holder 26 has a pressure sensitive part 35 built into it.
This pressure sensitive part 35 is υ
It is organized. ” and correct it.

(3) On page 8, lines 6 to 4, and line 7, “
``Pressure section 28 and t-pole section 29'' was replaced with ``pressure sensitive section 6''.
5” and correct it.

(4) Page 8, line 12, approximately page 17, line 2.

In the 6th line, the description "Pressure part" will be corrected to "Pressure sensitive part."

(5) On the 5th line of page 1 of 1 Town, the entry ``V pressure section 21j'' has been corrected to ``pressure sensitive section 35j.''

(6) On page 14, lines 19 and 20, "the pole part 29 and the pressure part 28" and 6 are replaced with "the pressure sensitive part 35".
I am corrected.

(7) The following explanatory text was added between lines 8 and 9 of page 16.

``In this embodiment, the pressure-sensitive filter 5 is constructed with a pressure section 28 made of pressurized conductive rubber and a grounded electrode section 29 with the lead wire 60 in a conductive state. The pressure sensitive part may be made of steel formed into a substantially U-shape.The pressure sensitive part may also be composed of a pressure sensitive element such as a ceramic or a strain gauge.'' (8) Same page 16 In line 19, page 17, line 6, the statement ``...via a web spring...'' has been corrected to ``...via a repulsive means such as a web spring...''.

(9゛) In the 1st or 2nd line of page 17, “・
・・Connected・・Payment・・
“・Place the pressure part in the electrically connected place.”

On page 17 of ``OC Heel,'' page 17, line 7 of W-'l, the text ``Tt plate'' and the description ``force [pressure part''] will be corrected to ``1 pressure sensitive part''.

(9) Following the code explanation on page 18, line 16, the following code explanation is added.

“65-・Pressure Sensing Part” ■ Figure 2 in the attached page of the application form has been corrected as shown in the attached sheet.

Claims Each cavity of a mold for molding a large number of injection molded parts is provided with a sliding hole penetrating to the back side of the mold,
An ejector plate connected to the mold is disposed on the back side of the mold, and between the mold and the ejector plate, the distal end is inserted into the sliding hole of the mold, and the cavity is inserted into the cavity. A detection rod that protrudes from the base end and has a flange portion and a protrusion at the base end and a unit that is attached to the Nijefter and the main body are rounded and attached to the unit body (= the base of the detection rod At the same time, I put the part on the web through 1 non-drunken repulsion and put it on the outside, and also put 11 on the unit body.
A pressure sensing unit is disposed in which a pressure sensitive part is connected to a lead class through a holder made of an insulating material, and the detection rod is movable toward and away from the pressure sensitive part via a web spring 5oLn±-cypress. The detection rod of each detection unit is actuated by the high pressure injected into each cavity and comes into contact with the pressure sensitive part, thereby sending a filling confirmation signal and moving the ejector plate out of alignment with the mold. A defective flash detection device for injection molded products, characterized in that it is configured to take out a locking code that operates vertically.

Figure 2

Claims (1)

[Claims] A 4J movement hole penetrating to the back side of the mold 4 is inserted into each cavity of the mold for molding a large number of injection molded parts, and an ejector plate connected to the coin mold is installed on the back side of the mold. At the same time, between the mold and the ejector plate, there is a sliding hole [JIT+7] with the tip end shaped like a front grip, which protrudes into the cavity, and a flange part and a protrusion at the base end. The detection rod has 9 parts and a unit body attached to the ejector plate, and the base end of the detection rod is elastically mounted on the unit body via a web spring. 7. The main body houses an electrical part to which a lead wire is connected via a holder made of an insulating material, and a suction hole, and the above-mentioned rod can be moved into and out of contact with the pressure part via a web spring. A detection unit provided in the above-mentioned cavity is disposed, and the detection rod of each detection unit () is actuated by the injection pressure into each cavity and comes into contact with the pressurizing part to confirm filling. A device for detecting underfill defects in injection molded products, characterized in that the device is configured to extract a signal and a signal that operates the ejector plate independently of the mold.