JPH07156157A - Method and apparatus for cleaning resin mold - Google Patents

Abstract

PURPOSE:To certainly clean a amold by bringing a rotary brush the rotary shaft of which is made vertical to the molding surface of a mold into contact with the molding surface under rotation and moving the same along the mold so as to differentiate the forward and return routes of the rotary brush. CONSTITUTION:A rotary shaft 59-1 is made vertical to the molding surface 42a of a mold 42 and a rotary brush 57-1 is attached to the rotary shaft 59-1 to be rotated in contact with the molding surface 42a. The rotary brush is reciprocally moved along the mold 42 and, by differentiating the forward and return routes of the rotary brush, a planer spiral locus is widely drawn and the molding surface 42a is uniformly brushed. Resin refuse generated by brushing is blown off from the molding surface 42a by high pressure air 101 blown out of a nozzle 66 and sucked from an enclosure part 69 to be discharged.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for cleaning a resin molding die, and more particularly to a method for brushing and cleaning a die for molding an IC resin package.

If foreign matter such as resin dust remains attached to the inside of the resin molding die, foreign matter mixing failure such that foreign matter mixes into the molded resin package, dent failure in which a dent is formed on the resin package, and the like occur. .

For this reason, the mold is cleaned by brushing using a brush every time the resin molding is completed.

It is desirable that this cleaning be a method capable of removing foreign matter more reliably.

[0005]

2. Description of the Related Art Conventionally, as shown in FIG. 9, a mold cleaner 12 having a brush 10 on the periphery and a suction port 11 in the center is used, which is placed between a lower mold 13 and an upper mold 14. Was moved back and forth as indicated by arrow 15 to clean the molds 13 and 14.

Further, conventionally, as shown in FIG. 10 and FIG. 11, using a mold cleaner 25 having rotating roller brushes 20 and 21, high pressure air blowing nozzles 22 and 23, and a suction port 24, a roller is used. The brushes 20 and 21 are rotated as shown by the arrows, high-pressure air is blown from the nozzles 22 and 23, and the high-pressure air is sucked through the suction port 24, while the lower mold 1
The molds 13 and 14 were cleaned by reciprocating between 3 and the upper mold 14 as shown by the arrow 26.

[0007]

In the cleaning method shown in FIG. 9, the brush 10 is fixed, and the brushing direction is limited to one direction.

For this reason, it is difficult to completely remove the resin residue attached to the cavities of the molds 13 and 14 having the complicated shape.

In the method shown in FIGS. 10 and 11, the contact between the roller brush 20 and the upper mold 14 and the roller brush 21.
Since the contact between the upper mold 14 and the lower mold 13 is line contact, each part of the upper mold 14 and the lower mold 13 has a roller brush 20,
21 passes by and is brushed only for a moment.

For this reason, although the roller brushes 20 and 21 are rotating, it is difficult to completely remove the resin residue attached to the cavities of the molds 13 and 14 having the complicated shapes.

Therefore, an object of the present invention is to provide a method for cleaning a resin molding die that solves the above problems.

[0012]

According to a first aspect of the present invention, a rotating brush whose rotating shaft is perpendicular to a molding surface of a resin molding die is used, and the rotating brush is brought into contact with the molding surface.
While rotating, it is configured to move along the mold.

According to a second aspect of the present invention, a rotating brush whose rotating shaft is perpendicular to the molding surface of the resin molding die is used, and the rotating brush is brought into contact with the molding surface and is rotated, while the metal mold is rotated. The structure is such that the outward path and the return path are moved differently along the mold.

According to a third aspect of the present invention, a rotating brush whose rotating shaft is perpendicular to the molding surface of the resin molding die, and the rotating brush which is brought into contact with the molding surface and is rotated, are attached to the mold. It is configured to include means for moving along.

According to a fourth aspect of the present invention, a rotating brush whose rotating shaft is perpendicular to the molding surface of the resin molding die, and the rotating brush which is brought into contact with the molding surface and is rotated, are attached to the mold. It is configured to have means for moving the outward path and the return path by making them different from each other.

[0016]

According to a first aspect of the present invention, there is provided a rotating brush whose rotating shaft is perpendicular to a molding surface of a resin molding die, and the rotating brush is brought into contact with the molding surface and is rotated, and along the mold. The configuration in which the rotary brush is moved acts so that the locus of each point of the rotary brush on the molding surface becomes a plane spiral shape.

According to a second aspect of the present invention, there is used a rotating brush whose rotating shaft is perpendicular to the molding surface of the resin molding die, and the rotating brush is brought into contact with the molding surface and rotated to move along the mold. The structure that moves the outbound path and the inbound path differently
The locus on the molding surface of each point of the rotary brush acts so as to have a plane spiral shape, and the locus of the plane spiral shape acts so as to be deviated between the forward path and the return path.

According to a third aspect of the present invention, there is provided a means for moving a rotating brush whose rotating shaft is perpendicular to the molding surface of the resin molding die so that the rotating brush is brought into contact with the molding surface and is rotated while being moved along the mold. Acts so that the locus of each point of the rotary brush on the molding surface becomes a plane spiral.

A rotating brush whose rotation axis is perpendicular to the molding surface of the resin molding die is brought into contact with the molding surface to rotate the brush while making a forward path and a return path along the mold. The structure having the means for moving them differently acts so that the locus on the molding surface of each point of the rotary brush becomes a plane spiral shape, and the plane spiral locus is formed deviating between the forward path and the return path. Act on.

[0020]

1 and 2 show a method for cleaning a resin molding die according to an embodiment of the present invention.

For convenience of description, first, the mold cleaning used for cleaning the mold will be described.

FIG. 3 shows a mold cleaner 40.

The mold cleaner 40, as shown in FIG.
It is incorporated in the mold resin sealing device 41 and cleans the molding surfaces 43a and 43b of the lower mold 42 and the upper mold 43.

As shown in FIG. 2, a cavity 45, a gate 46, an air vent 47, etc. are formed on the molding surface 42a of the lower mold 42.

A cavity (not shown) or the like is also formed on the molding surface 43a of the upper mold 43.

A suction device 44 is provided in the resin sealing device 41.

The mold cleaner 40, as shown in FIG.
A base 50 screwed to a part of the device 41, and a base 50
The first slide driving mechanism 51 is supported above and is moved in the X ₁ and X ₂ directions with respect to the base 50 by the first slide driving mechanism 51.
Of the second frame 54, which is supported on the frame 52 of the second frame and is moved in the Y ₁ and Y ₂ directions with respect to the first frame 51 by the second slide drive mechanism 53; The cleaner head 55 is fixed to the end of the frame body 54.

In the first slide drive mechanism 51, the cleaner head 55 is moved in the X ₁ and X ₂ directions by the stroke S ₁ (see FIG. 2).
See) Move. The stroke S ₁ has a length substantially corresponding to the length dimension L ₁ of the lower mold 42.

The second slide drive mechanism 52 moves the cleaner head 55 in the Y ₁ and Y ₂ directions by a stroke S ₂ (see FIG. 2). The stroke S ₂ is about 1/4 of the diameter D of the rotating brush described later.

As shown in FIG. 5 as well, the cleaner head 55 has four rotary brushes 56 _{-1 to} 56 _-4 closely arranged in a line on the upper side, and also close to the lower side. Four rotary brushes 57 _{-1 to} 57 _-4 arranged in a line, and have a length substantially corresponding to the width dimension W ₁ of the lower mold 42.

In the rectangular frame-shaped case 58, the rotary shafts 59 _-1 to
59 _-4 are supported by bearings 60 and 61 (see FIG. 1) on the upper and lower sides, respectively, and are arranged side by side in a vertical direction.

Gears 62 _{-1 to} 62 _-4 having the same diameter are fixed to the rotary shafts 59 _{-1 to} 59 _-4 . Adjacent gear 62 _-1
~ 62 _-4 are meshed.

[0033] rotary shaft 59 _-2, pulley 63 is fixed.

The rotating brush 56 _-1 to 56 _-4, is fixed to the upper end of each rotary shaft 59 _-1 to 59 _-4.

The rotating brush 57 _-1 to 57 _-4, is fixed to the lower end of each rotary shaft 59 _-1 to 59 _-4.

A nozzle block 64 having a substantially rectangular plate shape is fixed to one side surface of the case 58.

The nozzle block 64 has a plurality of nozzles 65 on its upper surface and a plurality of nozzles 66 on its lower surface.

An oval enclosure 67 surrounding the case 58 and the nozzle block 64 is attached to the other side surface of the case 58.

On the upper side of the enclosing body 67, a strip-shaped rubber plate has an elliptical shape, and an enclosing portion 68 surrounding the rotating brushes 56 _{-1 to} 56 _-4 is provided.

Below the enclosure 67, the enclosure 69 is also provided.
Is provided and surrounds the rotating brushes 57 _{-1 to} 57 _-4 .

Rotating brushes 56 _{-1 to} 56 _-4 , 57 _{-1 to} 57
_As shown in FIG. 6, _-4 has a configuration in which the bristles 70 having the spherical bristle tips 70a and the bristles 71 having the needle-shaped bristle tips 71a are mixed and planted.

The hairs 70 and 71 are made of PEEK (Poly Ether E).
ther Ketone) Made of fiber. PEEK is a kind of super engineering plastic, and has a high melting point of 334 ° C and excellent heat resistance.
It is heat resistant, has good chemical resistance, is tough, and has good moldability.

As shown in FIGS. 2, 3 and 4, a motor 75 is attached to the second frame 54.

A pulley 76 fixed to the motor shaft of the motor 75 and a pulley 6 fixed to the rotating shaft 59 _-2.
A belt 77 is stretched between the belt 3 and the belt 3.

A pipe 80 is attached to the second frame 54.

One end of the pipe 80 reaches the inside of the cleaner head 55 and is connected to the nozzle block 64 as shown in FIG. The other end of the pipe 80 is connected to a high pressure air source 81.

A suction duct 82 is provided on the second frame 54.

One end of the suction duct 82 reaches the inside of the cleaner head 55, and the suction ports 82a, 82b.
Is located inside the cleaner head 55.

The other end of the suction duct 82 is connected to the suction device 44.

Next, the cleaning of the mold, which is performed every time the resin is molded, using the mold cleaner 40 having the above-mentioned structure will be described.

After the resin molding is completed, the mold is cleaned by the upper and lower molds 4 as shown in FIGS. 1, 2 and 4.
In the state where 2 and 43 are separated, the motor 75 is driven, the first slide drive mechanism 51 and the second slide drive mechanism 53 are operated in sequence, high pressure air is sent, and the suction device 44 is operated. Done.

When the motor 75 is driven, the rotating shaft 59 _-2
Is driven by the belt and rotates counterclockwise. Rotating shaft 59
_-2 rotation is performed through the gears 62 _{-1 to} 62 _-4 through the rotating shaft 5
9 _-1 , 59 _-3 , 59 _-4 are transmitted to rotate each.

As a result, the rotary brushes 56 _-2 , 57 _-2 ,
56 _-4 , 57 _-4 rotate counterclockwise as shown by arrow 90, and rotating brushes 56 _-1 , 57 _-1 , 56 _-3 , 57 _-3 rotate clockwise as shown by arrow 91. .

Rotating brushes 56 _{-1 to} 56 _-4 , 57 _{-1 to} 57
_-4 rotates so that adjacent ones rotate in opposite directions.

First and second slide drive mechanisms 51, 53
Operate in a sequence, and the cleaner head 55 makes a box motion so that its center 92 moves along a locus 93 indicated by reference numeral 93. That is, the cleaner head 55 is
The following four movements (i) Vertical movement from position P ₁ to P ₂ in the X ₁ direction (progress) (ii) Horizontal movement from position P ₂ to P _{3 in the} Y ₁ direction (ii) Position Longitudinal movement from P ₃ to P ₄ in the X ₂ direction (backward) (iv) Horizontal movement from position P ₄ to the original P ₁ in the Y ₂ direction is repeated a plurality of times.

At this time, the rotary brushes 57 _{-1 to} 57 _-4 make surface contact with the molding surface 42a of the lower mold 42 and rotate to move while brushing the molding surface 42a, as shown in FIG.

Focusing on each point of the rotary brush 57 _-1 , during the vertical movement (outward path) in the forward direction of (i), a plane spiral locus indicated by reference numeral 94 _-1 is drawn. At the time of the vertical movement (returning path) in the backward direction of (iii) above, a plane spiral locus indicated by reference numeral 95 _-1 is drawn.

The points of the other rotary brushes 57 _-2 , 57 _-3 , and 57 _-4 are also planar spiral loci 94 _{-2 to} 94 like the above.
_-4 , 95 _{-2 to} 95 _-4 are drawn.

The plane spiral loci 95 _{-1 to} 95 _-4 are deviated from the plane spiral loci 94 _{-1 to} 94 _-4 .

As described above, firstly, each rotating brush 5
Brushing is performed so that 7 _{-1 to} 57 _-4 are in surface contact with each other while drawing a trajectory of a plane spiral shape, so that the molding surface 42 a of the lower mold 42 is uniformly brushed.

Moreover, the plane spiral locus 94 _-1 during forward movement
~ 94 _-4 and the plane spiral loci 95 _{-1 to} 95 _-4 at the time of retreating are displaced by a distance corresponding to the stroke S ₂ , so that the brushing movements tend to be less during advancing, and adjacent rotating brushes. The part between them is surely brushed at the time of retreat, and the molding surface 42a of the lower mold 42 is brushed more evenly.

As a result, the cavity 45 and the gate 4
6. The resin residue attached to the air vent 47 is reliably scraped out.

Further, since the bristles of the rotary brushes 57 _{-1 to} 57 _-4 are of two types as shown in FIG. 7, the resin residue is more reliably scraped out.

That is, the spherical bristle tips 70a of the bristles 70 are
Even if 0 is deflected, the resin always comes into contact with the mold at a point, and therefore has a large ability to remove resin residue. The needle-shaped bristle tip portion 71a of the bristle 71 penetrates into a deep portion of a fine groove such as a cavity and efficiently scrapes out resin residue attached thereto.

As a result, the cavity 45 and the gate 4
6. The resin debris attached to the air vent 47 is more reliably scraped out and removed.

[0066] In addition, upper rotary brush 56 _-1 to 56
_{In No. 4 as} well, similarly to the above, the molding surface 43a of the upper mold 43 is uniformly brushed while drawing a planar spiral locus to remove the resin residue attached.

Further, as shown by reference numeral 100 in FIG.
High-pressure air is blown from the upper nozzle 65 onto the molding surface 43a, and, as indicated by reference numeral 101, the lower nozzle 6
High-pressure air is blown from 6 to the molding surface 42a, and the removed resin debris is blown off and rises.

Here, the enclosing portion 68 made of a rubber plate is the upper die 4
3, the surrounding portion 69 is in contact with the lower mold 42, so that the resin residue does not scatter outside the cleaner head 55.

The resin debris that has risen up is sucked into the suction port 82a,
It is sucked into the suction duct 82 from 82b, carried out of the cleaner head 55, and collected.

As a result, the molding surface 42 of the molds 42, 43
a and 43a are cleaned well.

As a result, it is possible to surely prevent the foreign matter mixture defect, the dent defect and the like from occurring in the resin package of the IC.

Next, a modified example of the mold cleaner 40 will be described.

Gears 62 _{-1 to} 62 _{-4 in} FIGS. 3 and ₄
Instead of this gear, a pulley having a diameter smaller than that of the gear may be provided, and the double-sided toothed belt may be provided over the pulley in a different manner.

Rotating brushes 56 _{-1 to} 56 _-4 . 57 _-1 ~
57 _-4 , as shown in FIG. 8, a configuration in which only the bristles 70 having the spherical bristle tips 70a are planted or a configuration in which only the bristles 71 having the needle-shaped bristle tips 71a are flocked as shown in FIG. Good.

[0075]

As described above, according to the invention of claim 1, since each point of the rotary brush moves so as to draw a flat spiral on the molding surface, the molding surface can be brushed uniformly. Therefore, the molding surface can be cleaned well.

According to the second aspect of the present invention, since each point of the rotary brush moves so as to draw a plane spiral on the molding surface, and brushing is performed at a different place on the outward path and the return path, the molding surface can be made evenly. Brushing can be performed, and thus the molding surface can be cleaned more favorably.

According to the third aspect of the present invention, since each point of the rotary brush moves so as to draw a plane spiral on the molding surface, the molding surface can be brushed without unevenness.
The molding surface can be cleaned well.

According to the fourth aspect of the present invention, since each point of the rotary brush moves so as to draw a plane spiral on the molding surface, and brushing is performed at different places on the outward path and the return path, the molding surface can be further uniformed. Brushing can be performed, and thus the molding surface can be cleaned more favorably.

[Brief description of drawings]

FIG. 1 is an elevational view illustrating a method for cleaning a resin molding die according to an embodiment of the present invention.

FIG. 2 is a plan view illustrating a method for cleaning a resin molding die according to an embodiment of the present invention.

FIG. 3 is a view showing a mold cleaner used in the cleaning method of the present invention.

FIG. 4 is a view showing a state where the mold cleaner of FIG. 3 is incorporated in a mold resin sealing device.

FIG. 5 is a diagram showing a cleaner head.

FIG. 6 is a diagram showing a structure of bristles of a rotating brush.

FIG. 7 is a diagram showing a first modified example of the structure of the bristles of the rotating brush.

FIG. 8 is a diagram showing a second modified example of the structure of the bristles of the rotating brush.

FIG. 9 is a diagram showing an example of a conventional method for cleaning a resin molding die.

FIG. 10 is a diagram showing another example of a conventional method for cleaning a resin molding die.

FIG. 11 is a diagram illustrating the cleaning method of FIG.

[Explanation of symbols]

40 Mold Cleaner 41 Mold Resin Sealing Device 42 Lower Mold 42a, 43a Molding Surface 43 Upper Mold 45 Cavity 46 Gate 47 Air Vent 50 Base 51 First Slide Drive Mechanism 52 First Frame 53 Second Slide Drive mechanism 54 Second frame 55 Cleaner head 56 _{-1 to} 56 _-4 , 57 _{-1 to} 57 _-4 Rotating brush 58 Rectangular frame-shaped case 59 _{-1 to} 59 _-4 Rotating shaft 60, 61 Bearing 62 _-1 -62 _-4 Gear 63,76 Pulley 64 Nozzle block 65,66 Nozzle 67 Enclosing body 68,69 Enclosing portion 70,71 Hair 70a Spherical bristle tip 71a Needle bristle tip 75 Motor 77 Belt 80 Piping 81 High pressure air groove 82 suction duct 82a, 82b suction port 90, 91 arrow 92 around which indicates the direction of rotation of the rotary brush 93 locus 94 _-1 to 94 _-4, 95 _-1 to 9 _-4 planar spiral path 100, 101 balloon pressure air

Claims (4)

[Claims] 1. The rotating shaft (59 _-1 ) has a resin molding die (4).
A configuration in which a rotating brush (57 _-1 ) perpendicular to the molding surface (42a) of 2) is used, the rotating brush is brought into contact with the molding surface, and is rotated and moved along the mold. A method for cleaning a resin molding die, comprising: 2. The rotating shaft (59 _-1 ) has a resin molding die (4).
The rotary brush (57 _-1 ) perpendicular to the molding surface (42a) of 2) is used, and the rotary brush is brought into contact with the molding surface and is rotated, and the forward path and the return path are along the mold. A method for cleaning a resin molding die, characterized in that they are moved differently from each other. 3. The rotating shaft (59 _-1 ) has a resin molding die (4).
2) a rotating brush (57 _-1 ) which is perpendicular to the molding surface (42a), and a means for bringing the rotating brush into contact with the molding surface and rotating the brush while moving it along the mold. A cleaning device for a resin molding die, characterized in that 4. The rotating shaft (59 _-1 ) has a resin molding die (4
2) A rotating brush (57 _-1 ) which is perpendicular to the molding surface (42a), and the rotating brush is brought into contact with the molding surface and rotated, and a forward path and a return path are provided along the mold. A cleaning device for a resin molding die, characterized in that the cleaning device comprises means for moving the parts differently.