JPS62176818A - Automatic apparatus for removing resin burr of injection molding - Google Patents

Abstract

PURPOSE:To carry out the removal all resin burrs in a mold and to improve thereby the working efficiency by forming both a cavity for the first molding and a cavity for both removing resin burrs and taking a molding out within a same radial distance of a mold. CONSTITUTION:A cavity 13 for the first molding and a cavity 14 for both removing resin burrs and taking out a molding are formed in 180 deg. distance on a concentric circle of a top force 10. The first molding 17 and resin burrs 171 formed by injection molding are rotated by 180 deg. after mold opening to transfer to a position just below a cavity 14 for both removing resin burrs and taking out a molding, and clamping the mold is thereafter carried out. The molding and the resin burrs are thereafter removed in a distance of delta from a core 15 by actuating an ejector 22 of the molding machine and pressed hot air and an abrasive material are sent under pressure into the cavity 14 through an introducing hole 24 formed in the mold. The resin burrs are broken off by means of the spouting abrasive material, blown away and exhausted outside from an exhausting hole 26. Opening the mold is then carried out and the ejector 22 goes forward to obtain a molding 172 without burrs.

Description

Detailed Description of the Invention "Industrial Application Field" The present invention is characterized in that the primary molded product is cooled and solidified during primary molding, and after the mold is opened, the primary molded product is moved into a deburring cavity, and the burrs are removed in the deburring cavity. The present invention relates to an automatic resin burr removal device for injection molded products that can move the molded product to perform secondary molding after deburring.

"Prior Art" Resin burrs are formed when molten resin flows into the gaps between the parts constituting the metal seat, such as the dividing surface (PL surface) of the mold and the mating surface with the slide core.

The resin burr can be removed by removing it from the mold, scraping it off using a sharp knife, or, in the case of resin burr formed on a lead frame such as a semiconductor mold, using abrasive grains such as aluminum oxide. It is known to remove the resin particles by spraying powder or granules homogeneous to glass beads or molded products under pressure, or by spraying them onto water under pressure from a nozzle.

``Problems to be solved by the invention'' Conventional resin deburring methods are carried out after the mold is removed once, so a decrease in work efficiency is unavoidable. Further, when secondary molding is performed without removing resin burrs formed in primary molding, such as in multicolor molding, it becomes difficult to obtain a molded product with high precision.

In view of these problems, it is a technical object of the present invention to remove the resin burr f without deteriorating work efficiency, and at the same time, do not cause trouble in secondary molding.

"Means for solving problems" Technical section 2 of the present invention! In order to solve the problem a, the following technical measures are taken.

(A) A primary molding cavity and a molded product extraction cavity that also serves as resin burr removal are formed within the same radius in the mold.

(B) After primary molding, one of the molds is moved and the other is rotated at a constant FFI angle, so that the primary molded product corresponds to the cavity for taking out the molded product, which also serves as a resin deburr for the gold. For the first time in IIIM, a supply port is formed in the mold through which hot air and abrasive material for deburring the resin of the primary molded product are sent, and the supply port also serves as the deburring hole in the cavity for taking out the next molded product. Be connected.

(c) The mold is provided with an outlet for discharging the resin burrs dropped into the mold cavity and the abrasive material to the outside.

(E) An ejector par is provided in the mold to take out the primary molded product after opening the mold.

``Function'' of an automatic resin burr removal device for injection molded products characterized by having the above components (A), CB), (C), (D), and (6). Resin burrs formed on the surface are removed by releasing the lower mold L together with the primary molded product and removing the resin burrs.
The molded product is removed by rotating the molded product.
After the mold is clamped, a gap is formed between the mold and the lower mold, and in this state, hot air and abrasive material are supplied to the upper mold under pressure, and the resin burrs that were integrally formed on the molded product are removed by ejecting the abrasive material. It is broken and blown away by hot air, and at the same time, it is discharged to the outside through the discharge port L and i.

Also, when the removed primary molded product is rotated and placed in the secondary molding cavity, a new space is formed with the primary molded product, so when the molten resin of the two-color mouth is injected, it will become one piece. As a result, a molded product with a high quality can be obtained.

"Embodiment" Hereinafter, one embodiment of the first aspect of the present invention will be explained based on FIGS. 1 and 2.

A spool pusher with a spool 121 approximately in the center of the upper and lower molds 10 and 11! -212 is fitted, and the upper mold 10 has a primary molding cavity 13 concentrically arranged as shown in FIG.
and cavity 14 or 18 for removing resin burrs and taking out molded products.
They are formed at intervals of 0&.

Primary molding cavity 13 between the upper and lower molds 10 and 11.
14 is provided with a core block 15.

Injection molding machine z, 2 The injected molten resin passes through a nozzle (not shown), the spool 121 of the spool bush 12, the runner 16, etc., and enters the cavity formed by the primary molding cavity 13 and the core block 15. A molded article 17 as shown in FIG. 1 is formed therein.

171 is a thin resin burr that is formed in the space where the molded product 17 is formed, or in the gap between the dividing surfaces of the mold; 18 is the lower mold 1;
1 and a mounting plate 19, and the ejector plate 18 is a spool ejector plate having a protruding pin 181 provided between the molding machine and the mounting plate 19. I can do it.

Reference numeral 20 denotes a molded product ejector plate provided with a protruding pin 2014-V provided between the lower die 11 and the lower mounting plate 19. In this molded product ejector plate, the molded product ejector plate 20 is used to operate the ejector 22 on the molding machine side. The molded product 171'i in the rainbow cavity 14 is taken out by the ejecting pin 201 which rises as the ejector pin 201 rises.An upper mounting plate 27 is fixed to the upper mold 10 and holds the spool bushing 12 in a fixed position.

Reference numeral 23 denotes an introduction hole formed in the upper mold 10. One of the introduction holes 23 has a supply port 24 into which hot air for resin deburring and abrasive material are sent, and the other side has a molded product which also serves as a resin deburring T-. An open end 25 communicating with the extraction cavity 14 is formed.

Reference numeral 26 denotes a discharge port for discharging the hot air supplied to the cavity 14 and the fcllf fat burrs 171, etc. to the outside.One side of the discharge port 26 is connected to the cavity 14, and the other side is connected to a duct of a total external suction device. It is connected.

``Effects of the invention'' After the mold is opened, the resin burrs formed during injection molding are rotated 180 degrees with the molded product attached to the core. It is located directly below the ejection cavity, and the mold is clamped as it is.
Then, when the ejector of the molding machine is operated, the molded product and the core lυ are released by the resin bar +7'6δ, and the pressurized hot air and abrasive material are automatically pumped into the cavity through the introduction hole. The resin burr, which was formed integrally with the molded product, is broken by the ejected abrasive material, and is blown away by the hot air. At the same time, it is blown away by an external suction device and discharged through a duct to the outside. be discharged.

Next, the mold is opened, and as the ejector moves forward, a molded product with no burr is obtained.

All of these resin burrs are removed inside the mold and discharged to the outside through the duct T-, which further improves work efficiency, and since there is no burr scattering, it is also good for worker health management. Yes.

Next, an embodiment of the second aspect of the present invention will be explained based on FIGS. 3 to 71\IK.

An intermediate plate 103 is provided between the upper and lower molds 101 and 102, and a spool bush 105 for primary molding, a runner 106, and a cavity 107 for secondary molding are formed on the dividing surface 104 of the upper mold 101 and the intermediate plate 103. There is.

The intermediate plate 103 is integrally connected or directly connected to the rotating shaft 108 as shown in FIGS. 10
3 rises together with the primary molded product 109 and is rotated 120 degrees to the next resin deburring cavity 110.
01 is fixed to an upper mounting plate 126, and the lower mold 102 is fixed to a lower mounting plate 127.

111 is a resin burr generated when the primary molded product 109 is cooled and solidified.

112 connects the upper part 113 to the cavity 10 of the upper mold 101
7, the lower part 114 is a core block located in the lower mold 102, and the entire taper 113 is provided so that the intermediate plate 103 can be easily removed.

Reference numeral 115 denotes an introduction hole formed in the upper mold 101 shown in FIG. An open end 117 is formed which communicates with the.

118 is a discharge port formed in the lower mold 102 to discharge the resin burr 111 removed by the hot air and abrasive material supplied to the cavity 110;
One side communicates with the cavity 110 and the other side is connected to a duct of an external suction device.

120 is a cavity for secondary molding formed in the upper mold 101 and the intermediate plate 103, and this cavity is used for the primary molded product 1.
A sufficient gap is formed between 09 and 09.

Reference numeral 121 denotes a secondary molded product formed in the cavity 120, which is formed on the inner and outer peripheral surfaces of the primary molded product 109 by a spool bush 122) formed on the dividing surface 104 of the mold, and a runner 123.

124 is a core block of a primary molded product, and the core 1
The outer periphery of the upper part 125 of 24 is the secondary molded product 12 shown in FIG.
It is formed to have the same inner circumferential shape as No. 1.

Therefore, the secondary molded product made of 2al material as shown in FIG. In the machine shown in Figure (D), the primary molded product is rotated 120 degrees together with the intermediate plate, and it is crushed in the deburring chamber. Unwanted materials such as fC resin burrs are removed to the outside by the suction device in the machine shown in Figure 6.09. be discharged.

Subsequently, the upper die is raised and the intermediate plate is rotated upward by 120 degrees and is housed in the secondary molding cavity.

After the mold is clamped, the molded product is filled with a combined rubber material to complete the secondary molded product. (See Fig. 6) In short, since secondary molding is performed after removing the resin in the mold, a product with high molding quality can be obtained without any molding defects.

In addition, in the resin deburring of the present invention, is there a type in which the lower die is turned 180 degrees and a type in which the intermediate plate is rotated 120 degrees in order to perform secondary molding after resin deburring? It goes without saying that the present invention is not limited to these, and can also be applied to a type using a central rotating core.

[Brief explanation of drawings]

Fig. 1 is a longitudinal sectional front view of a mold equipped with a resin deburring device of the present invention, Fig. 2 is a schematic diagram of a rotating body, and Fig. 3 is a mold equipped with a resin deburring device of the present invention and a two-color molding device. Figure 4 is a schematic diagram of the rotating body, Figure 5 is a vertical cross-sectional view of the mold during secondary molding, and Figures 6 (a) to 6) show the primary shape, deburring, and secondary molding. A schematic explanatory diagram showing each step of subsequent molding, and FIG. 7 is a partially cross-sectional perspective view of the two-color molded product. 10.11.101.102: Upper and lower mold 13.14 knee? Yavitei 171: @ Fat burr 22: Ejector 24; Supply port 25: Open end 26: Discharge port Clock Applicant: Matsuda Farm Co., Ltd. Figure 1 Figure 2 Figure 3

Claims (3)

[Claims] (1), (A) A cavity for primary molding and a cavity for taking out the molded product that also serves as resin burr removal are formed within the same radius within the mold. (B) A location where, after primary molding, one of the molds is moved and the other is rotated at a predetermined angle so that the primary molded product corresponds to a cavity for taking out the molded product that also serves as a resin deburring part of the mold. What's in it. (C) A supply port through which hot air and abrasive material for removing resin burrs from the primary molded product are sent is formed in the mold, and the supply port is communicated with the cavity for taking out the molded product which also serves as the deburring function. To be there. (D) A discharge port is formed in the mold to discharge the abrasive material and the like together with the resin burr that has fallen into the cavity of the mold to the outside. (E) An ejector bar is provided in the mold to take out the primary molded product after opening the mold. An automatic resin burr removal device for injection molded products, characterized by comprising the above components (A), (B), (C), (D), and (E). (2) In the automatic resin burr removal device for injection molded products as set forth in claim 1, the molded product is removed from one side of the mold by the operation of the ejector bar during the resin burr removal stage. A slight gap must be formed. (3), (A) A cavity for primary molding, a cavity for removing resin burrs, and a cavity for secondary molding are each formed within the same radius at a required angle. (B) After primary molding, one of the molds is moved, and then the other mold or the intermediate plate is raised and rotated by a predetermined angle, so that the primary molded product corresponds to the resin deburring cavity of the mold. What's in it. (C) A supply hole through which hot air and abrasive material for deburring the resin of the primary molded product are fed is formed in the mold, and the supply port is communicated with the interior of the deburring cavity. (D) A discharge port is formed in one or the other of the molds for discharging the abrasive material and the like together with the resin burrs that have fallen into the mold cavity. (E), after resin deburring, one of the molds is moved;
Next, the other side of the mold or the intermediate plate is moved and rotated by a predetermined angle to be located at a location corresponding to the secondary molding cavity. (F) After the mold is closed, secondary molding is performed at required locations on the outer periphery of the primary molded product. (G) An ejector bar is provided in the mold to take out the molded product after opening the mold. Above (A), (B), (C), (D), (E), (F)
Automatic resin burr removal and multi-color molding equipment for injection molded products comprising (G) and (G) as constituent elements.