JP3296185B2 - Mold with pilot pin - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a molding die with a pilot pin which can be easily positioned in an insertion molding die such as a metal terminal.

[0002]

2. Description of the Related Art In the case of insert molding of metal terminals or the like, if the escape of pilot pins or a sufficient relief hole depth cannot be obtained in the cavity portion forming the product of the upper mold cavity block in the mold, A fixed pilot pin is provided to avoid such a portion, or a short pilot pin having a total length corresponding to the depth is provided to perform positioning of insert molding of a metal terminal or the like.

[0003]

However, in the above-mentioned conventional configuration and method, there is a problem that it is not possible to supply insert molding of metal terminals or the like stably and to perform appropriate positioning.

An object of the present invention is to provide a molding die with a pilot pin capable of performing stable supply and accurate positioning of a metal terminal or the like to be insert-molded. With the goal.

[0005]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a fixed pilot pin having a protruding distal end, a movable pilot pin which is protruded upward and urged upward by a spring, and is movable vertically. And a lower mold having a cavity block with a cavity formed on the upper surface forming a product, and an insertion hole into which the tip of a movable pilot pin arranged opposite to the lower mold is inserted and abuts, and a guide hole through which a fixed pilot pin is inserted The movable pilot pin is configured to move by being pressed by the upper surface of the insertion hole in synchronization with opening and closing of the lower die and the upper die.

According to the present invention, it is possible to perform stable supply and accurate positioning of a metal terminal or the like to be insert-molded.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The invention according to claim 1 of the present invention is directed to a fixed pilot pin having a protruding tip portion, a movable pilot pin which is also protruded and is urged upward by a spring and is movable up and down, and A lower die having a cavity block on the upper surface of which a cavity for forming a product is provided; a guide hole through which a fixed pilot pin is inserted, and an insertion hole into which the tip of a movable pilot pin disposed opposite to the lower die is inserted and abuts; And it is composed of an upper mold with a cavity block,
This is a molding die with a pilot pin in which the movable pilot pin is pressed and moved to the upper surface of the insertion hole in synchronization with the opening and closing of the lower and upper dies. It has the action of:

An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a front sectional view of an essential part for explaining the configuration and operation of a molding die with a pilot pin according to an embodiment of the present invention, and FIG. 2 is a front view of an essential part of a molding machine incorporating the same.

In FIGS. 1 and 2, reference numeral 1 denotes a fixed pilot pin made of a metal material or the like, which guides and positions the tip in a conical shape, and a lower mold block 2 having a cavity 9 for product formation on the upper surface. , Cavity block 2
The lower end of the cavity block 2 is fixedly held by a lower backing plate 3 fixed to the lower surface of the cavity block 2.

Reference numeral 4 denotes a movable pilot pin having a conical upper end provided with a stopper portion 12 at the lower end made of a metal material or the like, and an insertion hole 10 formed in the backing plate 3 at a predetermined position such as a metal terminal to be insert-molded. Is slidably moved up and down and inserted.

The movable pilot pin 4 is fixed to the lower surface of the backing plate 3 by a lower block 5
The lower surface of the stopper portion 12 is urged upward by a spring 6 disposed in a mounting hole 11 provided in the stopper portion 1.
The upper surface of the cavity block 2 is restricted by contacting the lower surface of the backing plate 3, and the upper end projects from the upper surface of the cavity block 2. Thus, the lower mold of the mold is formed.

Numeral 8 is an upper mold cavity block disposed opposite to the cavity block 2 and has a cavity 7 for forming a product on the lower surface thereof. 16.

A molding resin is injected into the cavity 9 of the lower mold and the cavity 7 of the upper mold to form a space for forming a predetermined product. Reference numeral 13 denotes an insertion hole corresponding to the movable pilot pin 4, and reference numeral 14 denotes a guide hole corresponding to the fixed pilot pin 1, which is provided on the lower surface of the cavity block 8. The above constitutes the upper mold of the mold.

Reference numeral 17 denotes a molding resin injection portion for forming a product;
Reference numeral 18 denotes an upper frame for fixing and holding the block 16, 19
Is the mold cavity block 2 and backing plate 3
Block 5 or cavity block 8,
A guide shaft on which the block 16 to which the backing plate 15 is fixed slides and a lower frame 20 to which the block 5 is fixed and held.

Next, the operation will be described. First, Figure 1
In the open state shown in (a), the movable pilot pin 4 is pushed up by the bias of the spring 6 to
It is set to the same height as the tip.

Next, the cavity block 8 of the upper die is lowered (the driving mechanism is not shown), and the tip of the movable pilot pin 4 is guided in contact with the insertion hole 13, and the fixed pilot pin 1 slides in the guide hole 14. To guide the lowering operation.

When the cavity block 8 further descends, the fixed pilot pin 1 is similarly inserted and guided by sliding through the guide hole 14, and the movable pilot pin 4
Is pressed against the upper surface of the insertion hole 13 and overcomes the biasing force of the elasticity of the spring 6 to be compressed.
It descends in synchronization with.

Then, as shown in FIG. 1 (b), after the mold is lowered to the closed state, a molding resin is injected into a space defined by the cavity 7 like the cavity 9 for forming a product, and insert molding is performed.

After the molding is completed, when the cavity block 8 is raised, the movable pilot pin 4 is raised in synchronization with the cavity block 8 by the urging of the spring 6 and the stopper portion 12 is moved.
Rises until the upper surface thereof contacts the lower surface of the lower backing plate 3 and guides the above-mentioned rising operation together with the fixed pilot pin 1.

Further, the cavity block 8 is raised and returned to the original mold-opened state, the molded product is taken out of the space formed by the cavity 9 and the cavity 7, and the one-step operation is completed.

Note that, depending on the product shape, the cavity 7 and the cavity 9
May not be required, and only the lower cavity 9 may be used. Alternatively, only the movable pilot pin 4 may be used depending on the size and the number of products.

The upper mold and the lower mold are composed of a combination of the cavity block 8, the backing plate 15, the block 16, and the individual parts of the cavity block 2, the backing plate 3, and the block 5, each having an integral structure. The upper mold and the lower mold may be used.

[0023]

As described above, according to the present invention, the pilot pin can be urged by the spring so that the pilot pin can escape and the guide hole can be formed in the cavity for forming the product of the cavity block in the upper die. In a mold that cannot be provided with a hole or does not have a sufficient depth of a relief hole, an advantageous effect that stable supply and accurate positioning of a metal terminal or the like to be insert-molded can be obtained.

[Brief description of the drawings]

FIG. 1A is a front sectional view of a main part of a molding die with a pilot pin according to an embodiment of the present invention in a mold open state; and FIG.

FIG. 2 is a front view of a main part of a molding machine in which the mold is incorporated.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Fixed pilot pin 2 Cavity block 3 Backing plate 4 Movable pilot pin 5 Block 6 Spring 7 Cavity 8 Cavity block 9 Cavity 10 Insertion hole 11 Mounting hole 12 Stopper 13 Insertion hole 14 Guide hole 15 Backing plate 16 Block 17 Injection 18 Upper frame 19 Axis 20 Lower frame

Continuation of the front page (56) References JP-A-7-323433 (JP, A) JP-A-8-25412 (JP, A) JP-A-6-190858 (JP, A) JP-A-60-198076 (JP) , A) Hikaru 1-169313 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) B29C 33/00-33/76 B29C 45/00-45/84

Claims (1)

(57) [Claims] 1. A fixed pilot pin having a protruding distal end, a movable pilot pin which is also protruded and urged upward by a spring and is movable up and down, and a cavity block provided on the upper surface with a cavity for forming a product. The lower mold has a lower mold that has a lower mold, an insertion hole into which the tip of a movable pilot pin arranged opposite to the lower mold is inserted and abuts, a guide hole through which a fixed pilot pin is inserted, and an upper mold that has a cavity block. A molding die with a pilot pin that moves by moving the movable pilot pin against the upper surface of the insertion hole in synchronization with opening and closing of the upper die.