JP2929693B2 - Mold equipment for insert molding - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to an insert molding die apparatus for inserting a part into a mold and integrally molding the same.

(Prior art) Injection molding (popularly called insert molding), in which preformed parts are inserted and integrated, increases the added value of molded products, facilitates easy assembly of parts, and reduces the size of multifunctional parts. It has been developed as a field of injection molding as a manufacturing method. In particular, robotization such as automatic insertion of insertion parts and removal of products by automatic machines has recently been required for the molding and manufacturing industry with a shortage of workers, and has made intense progress. However, there are still things that perform the insertion work by the feel of human hands.

Conventionally, as shown in FIG.
In the injection molding, which is inserted into the component insertion hole 22 and integrated, the clearance of 0.02 mm or more is not allowed in the component insertion hole 22 in order to prevent the occurrence of burrs on the molded product, so insert a thin and easily deformable cylindrical part What was done was the insertion work with such a force that it was not deformed by the feel of human hands. In addition, a work that has been deformed in advance is deformed (forced) by the feel of a human hand to perform an insertion operation.

(Problems to be Solved by the Invention) However, in the above-described prior art, since the work is inserted by the touch of a human hand, the work is forcibly inserted to damage the work, and the insertion time varies due to individual differences. The production volume was not constant.

In addition, there is a problem that it is very difficult to insert the work insertion hole because the entrance corner of the work insertion hole is not provided with guidance such as rounding and chamfering in order to prevent burrs.

(Means for Solving the Problems) An object of the present invention is to solve the above-mentioned problems, and in an insert molding die apparatus for inserting a part into a mold and integrally injection-molding the same, a mold for a fixed die is provided. A fixed pin capable of temporarily inserting a cylindrical part is protruded into the cavity, a movable die is provided with a hole for fitting the cylindrical part with a movable pin capable of sliding forward and backward coaxially with the fixed pin, and the movable pin is provided with the movable pin. It is characterized by projecting from the front surface of the movable mold.

(Embodiment) FIGS. 1 to 4 show an embodiment of the present invention. Reference numeral 1 denotes a fixed die, in which a fixed pin 3 protrudes into the cavity 2 and a chamfered portion 3a is formed at the tip so that the tubular part W can be easily temporarily inserted. Reference numeral 4 denotes a movable die, which is provided with a movable pin 6 which is coaxial with the fixed pin 3 and is urged forward by a spring 5 and is slidable forward and backward. The hole 7 to be obtained is moved by the movable pin 6
And are formed coaxially. The end of the movable pin 6 has a chamfer
6a is formed, the base flange 6b is locked to the step 8, and the movable pin 6 protrudes from the front surface of the movable mold 4.

Next, the operation will be described. The fixing pin 3 of the fixing die 1 in which the cylindrical part W held by the finger of the robot is opened.
The cylindrical part W, which is temporarily inserted into the first part, can be easily inserted even if the cylindrical part W is thin and slightly deformed because of the chamfered portion 3a. When inserted, the cylindrical part W is forced from the inner surface by the fixing pin 3 and is restored to the normal shape. Then, when the mold is clamped by the molding machine, as shown in FIG. 3, the movable pin 6 of the movable mold 4 is inserted into the fixed pin 3 and enters into the protruding portion of the cylindrical part W which has been restored to the normal shape. The movable pin 6 is retracted against the elasticity of the spring 5, and the cylindrical component W is inserted into the hole 7 of the movable mold 4,
The movable pin 6 is securely fitted. In this state, the resin is injected into the cavity 2 as shown in FIG. When the mold is opened, the molded product is delivered to the movable pin side. In this state the fifth
As shown in the figure, a finger 10 of the robot enters between the fixed mold 1 and the movable mold 4, and the cylindrical part W grasped on one surface is temporarily inserted into the fixed pin 3, and the suction tool 11 on the opposite surface. The molded product 12 remaining in the movable mold 4 is sucked and taken out. Next, the finger 10 of the robot is moved from between the molds, closed as described above, and injection molding is performed. Instead of protruding the movable pin by a spring, it may be performed by a cylinder or a mechanical mechanism.

(Effects) According to the present invention, in a mold apparatus for insert molding in which a component is inserted into a mold and injection molded integrally, a fixing pin capable of temporarily inserting a cylindrical component into a cavity of a fixed mold is provided. The movable mold is provided with a hole in which a movable pin and a cylindrical part that can slide back and forth coaxially with the fixed pin are provided in the movable mold, and the movable pin is projected from the front surface of the movable mold. In a state where the shape is forcibly restored to the normal shape and guided into the hole by sliding of the movable pin, the cylindrical part is not damaged. After the cylindrical part is inserted into the insertion pin, the cylindrical part is inserted into the transfer pin from the fixed pin to the movable pin by mold clamping. It is sufficient to insert it in a rough fashion, it can be inserted without relying on the feel of human hands, and it can be inserted quickly, so that there is high productivity and there is little difference in production volume due to individual differences of the inserter. or,
Once the cylindrical part is temporarily inserted into the fixed pin, and then transferred to the movable pin by clamping, even a large deformed cylindrical part can be temporarily forcibly fixed with the fixed pin and then forcibly inserted with the movable pin. Become. Furthermore, since the movable pin and the fixed pin are arranged to face each other, when the mold is opened during continuous molding, the cylindrical part remains on the movable pin and the fixed pin is in a state where the cylindrical part can be inserted. There is no need to insert the rear cylindrical part afterwards, and since the cylindrical part can be inserted into the fixing pin immediately after opening the mold, the molding time is shortened, which is very useful, and there is an advantage that it can be easily made into a robot.

[Brief description of the drawings]

1 is a front sectional view of an embodiment of the present invention at the time of mold opening, FIG. 2 is a front view at the time of inserting a cylindrical part, FIG. 3 is a front sectional view just before closing of the mold, and FIG. FIG. 5 is a front view of inserting a cylindrical part into a fixed mold opened after molding and simultaneously taking out the molded article. FIG. 6 is a front view of inserting a conventional cylindrical part, and FIG. FIG. 4 is an explanatory view showing a deformed state of a cylindrical part. 1 ... fixed die, 2 ... cavity 3 ... fixed pin, 3a ... chamfered part 4 ... movable mold, 5 ... spring 6 ... movable pin, 6a ... chamfered part

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁶ , DB name) B29C 45/26-45/44 B29C 45/14 B29C 33/14

Claims (1)

(57) [Claims] In an insert molding die apparatus for inserting a part into a mold and integrally injection-molding, a fixing pin for temporarily inserting a cylindrical part into a cavity of a fixed die is provided so as to protrude. A mold apparatus for insert molding, wherein a hole for fitting a cylindrical part with a movable pin that can slide back and forth coaxially with the fixed pin is provided in the movable mold, and the movable pin is projected from the front surface of the movable mold.