JP3813004B2 - Mold mold positioning mechanism - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a mold mold positioning mechanism that positions a mold mold that clamps a molded product and performs resin seal in a resin sealing apparatus.
[0002]
[Prior art]
Conventionally, when a schematic configuration of a mold of a resin sealing device is described, an upper and lower mold base is fixed to an upper and lower press platen. In the vicinity of the periphery of the mold base, upper and lower guide blocks are positioned and provided on four sides. The upper and lower chase units are accommodated in the accommodating portions surrounded by the upper and lower guide blocks, respectively. Since the upper and lower chase units need to be replaced in order to change the product type, the upper and lower chase units are mounted with a predetermined clearance so that they can be attached to and detached from the upper and lower chase units.
[0003]
For example, a conventional molding die positioning mechanism will be described with reference to FIG. 4A and 4B are a plan view and a front sectional view of the lower mold. In the vicinity of the periphery of the lower mold base unit 51, lower mold guide blocks 52 are provided on four sides. The lower mold guide block 52 is provided with an accommodating portion 54 that can accommodate the lower mold chase unit 53 by sliding it when it is attached or detached. The lower mold guide block 52 is positioned and fixed to the lower mold base unit 51. Similarly, an upper mold guide block (not shown) is positioned and fixed to the upper mold base unit. In addition, an ejector pin plate 56 is provided below the lower chase unit 53 so that an ejector pin (not shown) is erected so that the lower chase unit 53 can be inserted.
[0004]
Near the periphery of the lower die chase unit 53, lower die lock blocks 57 are provided at four locations. An upper die lock block 58 (not shown) enters and meshes between the lower die lock blocks 57, and positioning between the upper die and the lower die chase unit is performed. The lower die chase unit 53 is attached to the lower die guide block 52 with a clearance A of about 0.1 mm around.
If the lower mold chase unit 53 is fixed to the lower mold base unit 51 with high precision, the lower mold guide block 52 is loosened from the lower mold base unit 51 when the lower mold chase unit 53 is replaced. It is necessary to remove or replace it and it is difficult to replace it. For this reason, it is desirable to attach the upper and lower chase units to the mold with a certain clearance.
[0005]
[Problems to be solved by the invention]
Since the lower mold chase unit 53 is not fixed with respect to the lower mold base unit 51, there is a possibility that a defective setting of a molded product such as a lead frame to the mold will occur if the amount of horizontal movement is large. .
In addition, when the horizontal movement amount of the chase unit is large when opening and closing the mold, the interference between the upper mold lock block 58 and the lower mold lock block 57 increases, and the upper and lower lock blocks tend to be unevenly worn. There was a risk of a mismatch between the top and bottom of the package. For this reason, there has been a possibility that the maintenance cost may be increased by shortening the period of mold maintenance for rotating or replacing the upper and lower lock blocks.
[0006]
SUMMARY OF THE INVENTION An object of the present invention is to solve the above-described problems of the prior art and to enable positioning while suppressing the amount of movement when the upper and lower lock blocks are engaged while maintaining a predetermined clearance around the upper and lower chase units of the mold. An object of the present invention is to provide a mold positioning mechanism.
[0007]
[Means for Solving the Problems]
In order to solve the above problems, the present invention has the following configuration.
That is, in a mold mold positioning mechanism for mutually positioning mold molds for clamping and molding a product to be molded, an upper and lower guide block arranged to surround four sides in the vicinity of the periphery of the upper and lower base unit; The upper and lower chase units are provided with upper and lower chase units each of which can be accommodated by forming a predetermined clearance around the chase accommodating portion formed by surrounding the upper and lower guide blocks. And positioning means provided on at least one of the upper and lower guide blocks. The positioning means advances and retracts a positioning block connected to the eccentric cam by rotating an eccentric cam with respect to the concave portion of the upper and lower chase units. Reduce the amount of movement when the upper and lower lock blocks mesh with each other. Characterized in that it decided.
[0008]
Also, provided in each plurality of positions of said positioning means to said upper and lower guide block, or positioned by adjusting the clearance of the upper and lower chase unit mutually, said positioning means at a plurality of locations on one side of the upper and lower guide blocks It is also possible to position and adjust the clearance on the movable side with respect to the fixed side of the upper and lower chase units.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, preferred embodiments of the invention will be described with reference to the accompanying drawings.
FIG. 1 is a plan view and a front sectional view of a lower mold of a mold, FIG. 2 is an explanatory view showing an unlocked and locked state of a positioning mechanism of an upper and lower chase unit, and FIG. 3 is an explanatory view showing a schematic configuration of the mold. FIG.
[0010]
First, the schematic configuration of the mold will be described with reference to FIG.
In this embodiment, a mold die by lower die driving will be described, and the lower die side can be moved up and down by electric or hydraulic pressure from a driving source (not shown).
[0011]
Reference numeral 1 denotes a mold, which is supported and fixed to the upper fixed platen 2 and the lower movable platen 3. An upper base unit 4 is integrally supported and fixed to the upper fixing platen 2 by fixing bolts 5. A lower base unit 6 is integrally fixed to the lower movable platen 3 with knock pins, bolts or the like.
In the vicinity of the peripheral edge of the lower surface of the upper base unit 4, an upper guide block 8 having lead pins 7 suspended is disposed so as to surround the four sides. The upper guide block 8 is fixed to the upper base unit 4 with knock pins, bolts or the like. The upper chase unit 9 is accommodated in a T-shaped accommodating portion 8 a formed by being surrounded by the upper guide block 8.
[0012]
In addition, a lower guide block 11 having a lead bush 10 recessed is disposed in the vicinity of the periphery of the upper surface of the lower base unit 6 so as to surround the four sides. The lower guide block 11 is fixed to the lower base unit 6 with a knock pin, a bolt or the like. The lower chase unit 12 is accommodated in an inverted T-shaped accommodating portion 11 a formed by being surrounded by the lower guide block 11. The upper and lower chase units 9 and 12 are attached to the upper and lower guide blocks 8 and 11 so as to be detachable by sliding in the vertical direction in FIG.
The lead pins 7 provided on the upper guide block 8 and the lead bushes 10 provided on the lower guide block 11 are fitted and positioned when the mold 1 is clamped.
[0013]
The upper and lower chase units 9 and 12 are respectively provided with upper and lower lock blocks 13 and 14 at corresponding positions on the lower surface side and the upper surface side. When the mold 1 is clamped, the upper lock block 13 is The lock blocks 14 are formed so as to enter and mesh with each other.
The upper and lower guide blocks 8 and 11 are provided with upper and lower positioning mechanisms 15 and 16 as positioning means for positioning so that the upper and lower lock blocks 13 and 14 do not interfere with each other.
Ejector pin plates 26 on which upper and lower chase units 9 and 12 can be provided with ejector pins (not shown) are provided on the upper and lower base units 4 and 6, respectively.
[0014]
The procedure for positioning the mold will be described. First, the upper and lower base units 4 and 6 in a closed state (overlapped state) where the chase unit is not set are placed on the lower movable platen 3, and the lower base unit is placed. 12 is fixed to the lower movable platen 3. Next, the lower movable platen 3 is raised, the upper base unit 4 is brought into close contact with the upper fixed platen 2, and then the upper base unit 4 is fixed to the upper fixed platen 2. Then, the upper and lower chase units 9 and 12 are set in the chase accommodating portions surrounded by the upper and lower guide blocks 8 and 11 of the upper and lower base units 4 and 6, respectively. Finally, the vertical movement mechanisms 15 and 16 position the vertical chase units 9 and 12 by regulating the horizontal movement amount.
[0015]
The configuration of the vertical positioning mechanisms 15 and 16 will be described with reference to FIGS. FIG. 1A is a plan view of a mold, and FIG. 1B is a front sectional view of the mold. 2 (a) and 2 (b) are a plan view and a front view when the positioning mechanism is unlocked, and FIGS. 2 (c) and 2 (d) are a plan view and a front view when the positioning mechanism is locked, FIG. 2 (e). These are explanatory drawings which show the front-end | tip shape of a positioning block. In the present embodiment, as shown in FIG. 1A, the vertical positioning mechanisms 15 and 16 are provided at one location on each of the four sides of the vertical guide blocks 8 and 12, respectively.
[0016]
2 (a) to 2 (d), reference numerals 17 and 18 denote vertical positioning blocks, which enter the vertical chase units 9 and 12 for positioning. The upper positioning block 17 is provided in a recessed portion 19 of the upper chase unit 9 in which the upper lock block 13 is formed so as to advance and retreat. The lower positioning block 18 is provided in a recess 20 formed between the lower lock blocks 14 so as to be able to advance and retract about 3 mm.
The vertical positioning blocks 17 and 18 are guided to advance and retract on both sides by vertical positioning block guides 21 and 22, respectively. As shown in FIG. 2 (e), a tapered surface C may be formed at the corner portion of the front end portion of the vertical positioning blocks 17 and 18 in the approach direction. An eccentric cam 23 is connected to the upper and lower positioning blocks 17 and 18. The eccentric cam 23 is rotated by rotating the cam bolt 24 to move the vertical positioning blocks 17 and 18 forward and backward relative to the recesses 19 and 20.
[0017]
Further, a spring plunger 25 is pressed against the cam bolt 24, and when the cam bolt 24 rotates, it can be engaged with recesses (not shown) formed at two locations around the cam bolt 24. The location where the concave portion is formed in the cam bolt 24 is preferably two locations, the position where the working surface of the eccentric cam 23 has the maximum displacement amount and the position where the minimum displacement amount.
2 (a) and 2 (b) are positions where the working surface of the eccentric cam 23 is at the minimum displacement amount, and the upper and lower positioning blocks 17 and 18 are unlocked from the recesses 19 and 20 of the upper and lower chase units 9 and 12, respectively. Indicates. 2 (c) and 2 (d) show a state in which the cam bolt 24 is rotated 180 ° and the working surface of the eccentric cam 23 is rotated to a position where the maximum displacement amount is obtained. A locked state in which the units 9 and 12 are positioned by entering the recesses 19 and 20 respectively is shown.
[0018]
In FIG. 1A, the positioning operation by the vertical positioning mechanisms 15 and 16 provided on the four sides of the upper and lower guide blocks 8 and 11 will be described. The eccentric cams are sequentially rotated 180 ° from the cam bolts 24 at arbitrary positions among the four positions. 23 is rotated, and the vertical positioning blocks 17 and 18 are moved into the recesses 19 and 20 for positioning.
Specifically, as shown in FIG. 2 (c), the vertical positioning blocks 17 and 18 are made to enter the concave portions 19 and 20 of the vertical chase units 9 and 12. Accordingly, the clearance A between the upper and lower guide blocks 8 and 11 and the upper and lower chase units 9 and 12 is set as the clearance B ₁ or B ₂ between the upper and lower positioning blocks 17 and 18 and the upper and lower chase units 9 and 12 (A> B ₁ , B ₂ ), the amount of movement in the horizontal direction when the upper and lower lock blocks 13, 14 are engaged can be reduced or eliminated.
When a clearance is provided between the lead pin 7 and the lead bush 10, the values of the clearances B ₁ and B ₂ may be set in consideration of the displacement between the upper and lower base units 4 and 6.
[0019]
According to the above configuration, after the upper and lower chase units 9 and 12 are mounted on the upper and lower base units 4 and 6, the vertical positioning blocks 17 and 18 of the vertical positioning mechanisms 15 and 16 are simply moved into the recesses 19 and 20 on the chase side. Since the clearance A between the upper and lower guide blocks 8 and 11 and the upper and lower chase units 9 and 12 can be reduced to the clearance B ₁ or B ₂ between the upper and lower positioning blocks 17 and 18 and the upper and lower chase units 9 and 12, Positioning with high accuracy is possible. Therefore, since the amount of movement in the horizontal direction when the upper and lower lock blocks 13 and 14 mesh with each other can be reduced or eliminated, uneven wear can be reduced or prevented. Accordingly, the maintenance cost can be reduced by reducing the frequency of mold maintenance, and the upper and lower chase units 9 and 12 can be easily replaced. Therefore, workability and handling are extremely good.
[0020]
In the above embodiment, the positioning mechanism is provided at a plurality of positions on the upper and lower guide blocks 8 and 11, and the clearances of the upper and lower chase units 9 and 12 can be adjusted in four directions. The vertical positioning mechanisms 15 and 16 may be provided only on the other side with respect to one side in the Y direction, and the clearance may be adjusted in two directions.
[0021]
In the above-described embodiment, the vertical guide blocks 8 and 11 are provided with the vertical positioning mechanisms 15 and 16, respectively. However, any one of the vertical guide blocks 8 and 11 may be used. In this case, the chase unit on the side where no positioning mechanism is provided may be movable or may be fixed. The chase unit may be fixed by the positioning mechanism or by bolting.
[0022]
The present invention is not limited to the above embodiment. For example, the positioning mechanism does not have to be provided on each of the four sides of the guide block, and may be provided on each of one to three sides. It goes without saying that various modifications can be made without departing from the spirit of the invention, for example, the value of the surrounding clearance can be arbitrarily set.
[0023]
【The invention's effect】
As described above, according to the present invention, after the upper and lower chase units are mounted on the upper and lower base units, the eccentric cams of the positioning mechanisms provided on the guide block are rotated so that the positioning blocks linked to the eccentric cams enter the chase-side recesses. As a result, the clearance between the guide block and the upper and lower chase units can be further reduced, so that positioning can be performed with high accuracy. Therefore, since the amount of movement in the horizontal direction when the upper and lower lock blocks are engaged with each other can be reduced or eliminated, uneven wear can be reduced or prevented. Accordingly, the maintenance cost can be reduced by reducing the frequency of mold maintenance, and the upper and lower chase units can be easily exchanged. Thus, the workability and handling are extremely good.
[Brief description of the drawings]
FIG. 1 is a plan view and a front sectional view of a lower mold among mold dies.
FIG. 2 is an explanatory diagram showing an unlocked state and a locked state of the positioning mechanism of the upper and lower chase units.
FIG. 3 is an explanatory view showing an overall configuration of a mold.
FIG. 4 is a plan view and a front sectional view of a lower mold among conventional mold dies.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Mold die 2 Upper fixed platen 3 Lower movable platen 4,6 Vertical base unit 5 Fixing bolt 7 Lead pin 8,11 Vertical guide block 8a, 11a Housing | casing part 9,12 Vertical chase unit 10 Lead bush 13,14 Vertical lock block 15 , 16 Vertical positioning mechanism 17, 18 Vertical positioning block 19, 20 Recess 21, 22 Vertical positioning block guide 23 Eccentric cam 24 Cam bolt 25 Spring plunger 26 Ejector pin plate

Claims (3)

In the mold mold positioning mechanism that positions the mold molds that clamp the resin to be molded and seal the resin,
An upper and lower guide block arranged to surround the four sides near the periphery of the upper and lower base unit;
The upper and lower chase units that can be accommodated by forming a predetermined clearance around the chase accommodating portion formed by surrounding the upper and lower guide blocks on four sides,
The upper and lower chase units each include an upper and lower lock block that can mesh with each other, and at least one of the upper and lower guide blocks includes positioning means,
The positioning means rotates the eccentric cam and moves the positioning block linked to the eccentric cam forward and backward with respect to the concave portion of the upper and lower chase units, thereby positioning the upper and lower lock blocks with a reduced amount of movement. A mold die positioning mechanism characterized by the above. 2. The positioning mechanism for a mold according to claim 1, wherein the positioning means is provided at a plurality of locations on the upper and lower guide blocks, respectively, and can be positioned by mutually adjusting the clearances of the upper and lower chase units . 2. The positioning device according to claim 1, wherein the positioning means is provided at a plurality of locations on one side of the upper and lower guide blocks and can be positioned by adjusting a clearance on a movable side with respect to a fixed side of the upper and lower chase units. Mold mold positioning mechanism.

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