JPS62202715A - Speed changeover method in seal molding - Google Patents

Abstract

PURPOSE:To enable the titled method to realize speed changeover in a sealing process at a correct position even if a height or a supply quantity of a molding material is dispersed, by changing over a speed of a transfer piston from a position where the transfer piston has come into contact with a thermosetting mold material in a predetermined amount of strokes. CONSTITUTION:IC parts are mounted on a lower mold 11 and the lower mold 11 and an upper mold 12 are clamped. A transfer piston 15 is transferred to its uppermost position 15' and a tablet 20 is loaded into a material chamber 14. When a seal molding machine is started, the piston 15 descends at high speed and when a stroke becomes Hc-(H0+alpha) at time t1, the piston 15 descends at low speed and low pressure. When the stroke becomes Hc-H at time t2, the lower surface of the piston 15 comes into contact with the upper surface of the tablet 20 and a movement is stopped. The piston 15 descends at a speed V3 at time t3 while it is pressurizing the tablet 20 at pressure P3 and enters into a primary molding process. When the stroke becomes Hc-H+S1 at time t4, the piston 15 descends at a speed V4 while it is pressurizing the tablet 20 at pressure P4 and enters into a secondary molding process.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a sealing molding method, and particularly to a speed switching method for a transformer 7 up piston.

[Conventional technology]

In this type of sealing molding method, meblets or powder made of a thermosetting molding material is charged into a material chamber, the thermosetting molding material is pressurized by a transfer piston, guided into the mold cavity, and then molded into the mold. It seals elements such as integrated circuit components placed inside the mold cavity.

Generally, the speed of the transfer piston is changed at least once during molding, but this is conventional.

The speed was changed at a predetermined stroke position regardless of the shape or supply amount of the thermosetting molding material.

More details below [Problems to be solved by the invention] Here, in the case of a tablet, the thermosetting molding material generally has a cylindrical shape, but its height is not constant.
However, in the case of powder, the supply amount is not always constant. Therefore, with the conventional speed switching method, it was not possible to perform a stable soil forming operation, and it was not possible to manufacture a high quality product.

[Means and effects for solving the problem] The speed switching method according to the present invention is based on the position where the transfer piston contacts the thermosetting molding material, and the transfer piston/ By switching the speed of the molding material, the speed of the sealing process can be switched at the correct position even if there are variations in the height or supply amount of the molding material.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings.

Referring to FIG. 2, the sealing molding machine to which the present invention is applied has a lower mold 1 and an upper mold 12, and a tiger/sphere cylinder 13 is attached to the upper part of the stopper mold 12. .

Referring also to FIG. 1, the upper mold 12 has a through hole 12a approximately in the center, and when the upper mold 12 and the lower mold 11 are closed, the through hole 12a and the lower mold 1] A columnar material chamber 14 is formed by the provided circular depression lla. A transfer fan lifter 13 and a transfer piston 15 move in and out of this material chamber 14 . Transfer piston 15.

As shown by the dashed line 15' in FIG.
20 is inserted.

Referring to FIG. 6, a groove 11b extends from the outer periphery of a circular depression lla of the lower mold 1], and a plurality of depressions llc are provided at the tip of the groove 1]b. Therefore, lower mold 1]
and the upper mold 12 are closed.

A groove (not shown) is formed by the groove 11b and a groove (not shown) provided on the lower surface of the upper mold 12.

A mold cavity (not shown) is formed by the depression llc and a depression (not shown) provided on the lower surface of the upper mold 12. When the lower mold 1] and the upper mold 12 are in an open state, an element such as an integrated circuit component to be sealed is mounted in the depression IIC of the lower mold 1].

Referring again to FIG. 2, a position detector 16 for detecting the position of the transfer piston 15 is provided adjacent to the transfer cylinder 13. The transfer piston 15 is driven with its pressure and speed controlled by a pressure speed hydraulic regulator 17. In the pressure speed hydraulic regulator 17.

Command values for pressure and speed preset in pressure and speed setter groups 31 to 35 are inputted via contact groups r, to r of a group of relays, which will be described later. The position detection output detected by the position detector 16 is input to the position detection comparator 40, where it is compared with the command value of the position set in advance by the position setter groups 51 to 53, and the relay group 61 to 6501 is A current flows through.

H6+α is set in the position setting device 51. Here e
HO indicates the nominal height (average height) of the tablet 20, and α is determined by the variation of the tablet 20. For example, if the variation is within 10 mm, α is 10
If the distance is within 2 degrees, α is set to 2 degrees. The position setter 52 has a first stroke amount SI corresponding to the point where primary forming changes to secondary forming, and the position setter 53 has a first stroke amount SI of 2.
A second stroke amount S2 corresponding to the point where the next molding is switched to the curing (hardening) process is set. - Hereinafter, the operation of the present invention will be explained with reference to the flowchart shown in FIG.

With the lower mold 11 and the upper mold 12 opened, the integrated circuit component is mounted in the recess lle of the lower mold 11. The lower mold II and the stopper mold 12 are closed. The transfer piston 15 is moved to its upper limit position 15' and the tablet 20 is moved to the material chamber 14.
(Step 201). Here, the height of the inserted tablet 20 is assumed to be H (I (≦Ho+α)).

Also, the bottom surface of the tableno) 20 (the circular depression 11 of the lower mold 11)
Let Hc be the distance between a) and the upper limit position 15' of the transfer piston. Also, the distance from the bottom of the tablet adder to the bottom of the transfer piston 15 is expressed as the height h,
The distance from the bottom surface of the transfer piston upper limit position 15' to the bottom surface of the transfer piston 15 will be expressed as a stroke.

When the 9-piece sealing machine is started in this state, 1 position detector 1
6, the stroke is detected as Ortan (h = He), so the comparator 40 for detecting the 1st position is connected to the relay 61.
A current is passed through. As a result, the contact r1 of the relay 61 is closed, and the pressure command P1 and speed command V set by the pressure speed setting device 31 are input to the pressure speed hydraulic pressure regulator 17 (
Step 202). Due to this.

Transfer piston 15 descends at high speed.

Now, at time t1, the stroke is Hc-(H0+α)m
(h=HO+α) (YES in step 203)
and.

The position detection comparator 40 stops supplying current to the relay 61 and allows current to flow to the relay 62. Due to this.

Contact r1 of relay 61 is opened and contact r2 of relay 62 is closed, and pressure command P2 and speed command v2 set by pressure speed setting device 32 are input to pressure speed hydraulic pressure regulator 17 (step 204). . Therefore.

The transfer piston 15 descends at low speed and low pressure.

At time t2, the stroke is H8-Hran (h = H
) (YES in step 205), the lower surface of the transfer piston 15 comes into contact with the upper surface of the tablet 20.

The movement of the transfer piston 15 is stopped. The position detecting comparator 40 detects this stopped state via the position detector 16, and holds the position information "H" in a memory (not shown). Then, the comparator 40 for detecting the 2-position detects the 1st time t3.
The current supply to the relay 62 is stopped and the current is made to flow to the relay 63. As a result, contact r2 of relay 62 is opened and contact r3 of relay 63 is closed, and pressure command P3 and speed command V are input to pressure speed hydraulic pressure regulator 17 (
Step 206). Therefore, the transfer piston 15
The tablet is pressed at a pressure P3 and lowered at a speed v3, and enters the primary forming process. At this time.

A portion of the tablet 20 is guided into the mold cavity via a runner.

At time t4, the stroke is Hc-H+ 31 rran
(h = H-8,) (YES in step 207)
) and the 1-position detection comparator 40 stop supplying current to the relay 63 and allow current to flow to the relay 64. As a result, contact r3 of relay 63 opens and contact r of relay 64 opens.
4 is closed, and the pressure command P4 and speed command v4 are input to the pressure speed hydraulic pressure regulator 17 (step 208). Therefore, the transfer piston 15 moves the tablet 20 under pressure P
While applying pressure at step 4, it descends at speed v4 and enters the secondary forming process.

At time t, the stroke is Hc-H+S2m(h=)(
-S2) (YES in step 209), the two-position detection comparator 40 stops supplying current to the relay 64,
Flow current to relay 65. As a result, the contact r4 of the relay 64 is opened and the contact r of the relay 65 is closed, and the pressure command P and the speed command V are transmitted to the pressure speed hydraulic pressure regulator 1.
7 (step 210). After this, the curing process begins.

Thereafter, the mold is opened, the sealed integrated circuit component is removed, and the above-described operations are repeated.

In this embodiment, the case where the thermosetting molding material was made into a tablet was exemplified, but it goes without saying that a powder may also be used.

〔Effect of the invention〕

As is clear from the above description, according to the present invention, the speed of the transfer piston is determined based on a predetermined stroke amount from this reference position, with the position where the transfer piston contacts the thermosetting molding material as a reference. Because I am switching.

Even if there are variations in the height or supply amount of the molding material,
Stable sealing operation can be performed, and high-quality products can be stably manufactured.

[Brief explanation of drawings]

Fig. 1 is a diagram showing the arrangement relationship and position change of the transfer piston to explain the speed switching method according to the present invention, and Fig. 2 is a plan view showing the sealing molding machine to which the present invention is applied and its control device. and a block diagram, and FIG. 3 is a plan view of the lower mold shown in FIG. 2. FIG. 4 is a flowchart for explaining the present invention in detail. 14...Material chamber, 15...Transfer piston. 16...Position detector, 17...Pressure speed hydraulic pressure regulator. 20...Tablet (thermosetting molding material), 31-3
5... Pressure speed setter group, 40... Comparator for position detection. 51-52... position setter group, 61-65... relay group. "1~r... Relay contact group. -N +S Figure 3

Claims (1)

[Claims] 1. A method for sealing and molding a predetermined element placed in the mold cavity by pressurizing a thermosetting molding material introduced into a material chamber with a transfer piston and guiding it into a mold cavity. a step of detecting that the piston has contacted the thermosetting molding material and stopping the transfer piston; and a step of adding a predetermined first stroke amount from the stop position to the stop position.
a step of moving the transfer piston at a predetermined first speed to a stroke position to perform molding;
The transfer piston is moved from the first stroke position to a second stroke position obtained by adding a predetermined second stroke amount to the stop position.
A speed switching method in sealing molding, comprising a step of performing molding by moving at a speed of .