JP3577898B2 - Mold protection device - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a die protection device for molding using a lead frame or the like on which a forming element is mounted in order to form an electronic component or the like.
[0002]
[Prior art]
As a conventional die protection device, an abnormality is detected and controlled by a clamping operation of a lead frame or the like by an upper die and a lower die of a molding die to protect the die.
[0003]
In other words, when forming a strip-shaped lead frame made of a metal material or the like for forming an electronic component or the like on which a forming element is mounted with a resin material or the like using an upper mold and a lower mold of a molding die, a gap between the upper mold and the lower mold is required. First, the lead frame is conveyed, and first, the upper mold or the lower mold is moved by driving the cylinder by driving the low-pressure hydraulic circuit to hold the lead frame.
[0004]
Then, when there is no abnormality in the lead frame or the mold, and when it is judged by the various detection sensors attached to the mold that the upper mold and the lower mold have the regular interval or the mold clamping force, the regular Molding is performed by clamping using pressure-driven hydraulic circuits.
[0005]
If the upper and lower dies are not at the proper interval or due to the mold clamping force due to adhesion of foreign matter on the lead frame, displacement of forming elements, etc., or abnormalities in the mold, the cylinder is stopped by a signal from a detection sensor etc. This protects the mold.
[0006]
When a servo motor and a ball screw are used instead of a cylinder as the mold clamping mechanism, the mold protection is performed by low pressure mold clamping by controlling the torque of the servo motor or by a method of detecting and controlling the abnormality of the torque. is there.
[0007]
[Problems to be solved by the invention]
However, the low-pressure mold clamping force in the conventional mold protection device is a pressure of at least 1 to 2 tons, and a displacement of a forming element mounted on a lead frame or the like with respect to a cavity of a molding mold or foreign matter If a concentrated load is locally applied due to adhesion of the metal, there is a possibility that the mold is damaged or broken.
[0008]
Further, since the lead frame is actually sandwiched between the upper mold and the lower mold of the molding die, there is a problem that damage to the lead frame and the mounted forming element is inevitable.
[0009]
An object of the present invention is to solve the above-mentioned conventional problems, and it is possible to detect a displacement of a forming element in a lead frame or an adhesion of a foreign substance by detecting immediately before molding and performing a pre-processing to prevent damage to a molding die. It is an object of the present invention to provide a die protection device for preventing the occurrence of a die.
[0010]
[Means for Solving the Problems]
In order to solve the above-mentioned problem, a mold protection device according to the present invention includes a regulating guide that guides a lead frame on which a forming element is mounted, and a positioning block that is attached to one end of the regulating guide and that can move up and down to position the lead frame. And a pair of detectors that are similar in shape to the concave part of the cavity of the molding die and have holes for inserting forming elements, and a vertically movable pair of detectors, and the lead frame is transported by the output signal of the proximity sensor attached to the detectors. It is designed to control the driving of the molding die and detect abnormalities in the lead frame in advance outside the molding die, perform appropriate processing, and have a good return work efficiency, Breakage can be prevented.
[0011]
BEST MODE FOR CARRYING OUT THE INVENTION
According to the first aspect of the present invention, there is provided a regulating guide for guiding a lead frame on which a forming element is mounted, a positioning block attached to one end of the regulating guide and capable of vertically moving the lead frame, and a molding die. A pair of detectors that are similar in shape to the concave part of the cavity and have holes for inserting forming elements, and that can move up and down, and the output signal of a proximity sensor attached to the detector will convey the lead frame and move the molding die. This is a mold protection device that controls driving, and has an effect that an abnormality in the lead frame can be detected in advance outside the molding die.
[0012]
According to a second aspect of the present invention, in the first aspect of the invention, an air-hydro cylinder is used to drive the pair of detectors to move up and down, and the moving speed of the pair of detectors is appropriately adjusted, and This has the function of stopping accurately at a predetermined position without damaging the forming element.
[0013]
According to a third aspect of the present invention, in the first aspect of the present invention, a proximity sensor for detecting a position from a lead frame is attached to a side end portion, and a pair of expandable and contractible detectors is provided by a spring. This has the effect of not damaging the lead frame and the mounted forming element at the time of detection.
[0014]
According to a fourth aspect of the present invention, in the first aspect of the present invention, a detection sensor for detecting a forming element is attached adjacent to one end of the regulating guide. It has the effect of detecting leaks and omissions.
[0015]
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
1A is a configuration diagram of a mold protection device according to an embodiment of the present invention, FIG. 1B is a perspective view of a main part of the lead frame, and FIG. 2 is a main view showing a relationship between the detector and the lead frame. FIG. 3 is a cross-sectional view of a main part for explaining the detection operation, and FIG. 4 is a schematic front view of a configuration in which the mold protection device is mounted on a molding machine.
[0016]
In FIG. 1, reference numeral 7 denotes a strip-shaped lead frame made of a metal material or the like, and forming elements 7a and 7b such as an active element, a passive element, a mechanical element, or a composite thereof for forming an electronic component or the like are formed on the upper surface and the lower surface. And, it is attached by gluing, caulking, welding, fitting, press-fitting, etc. at the same interval as each cavity of the molding die for molding, and it is stored and stored in a strip or hoop shape of a predetermined length. Supplied.
[0017]
Reference numeral 1 denotes a plate-shaped upper detector made of a metal material, a resin material, or a ceramic material. A similar hole having a slightly larger outer shape than the concave portion of the cavity into which the forming elements 7a mounted at regular intervals on the lead frame 7 can be inserted. 1a is provided.
[0018]
Reference numeral 2 denotes a lower detector which also faces the upper detector 1, and has a similar hole 2b whose outer shape is slightly larger than the concave portion of the cavity into which the forming elements 7b mounted at regular intervals on the lead frame 7 can be inserted. .
[0019]
The upper detection body 1 and the lower detection body 2 are attached to a mounting plate 14 and a mounting plate 15 made of metal via compression springs 3 and 3a having built-in guide shafts (not shown) and compression springs 4 and 4a. Even if the upper detector 1 and the lower detector 2 contact the forming elements 7a and 7b and the lead frame 7, they are not damaged.
[0020]
The mounting plates 14 and 15 are vertically movable by inserting the slide shafts 10 and 11 fixed to the main body angle 17. The mounting plate 14 has the tip of the air-hydro cylinder 5 mounted on the main body frame. Numeral 15 also has the tip ends of the air-hydro cylinders 6 fixedly fixed, and is moved up and down or stopped and held at a predetermined position by driving them.
[0021]
Reference numeral 8 denotes a pair of regulating guides each having a U-shaped cross section made of a metal material, a ceramic material, or the like. The lead frame 7 is regulated and guided in the U-shape.
[0022]
Reference numeral 9 denotes a positioning block attached to a side end of the regulating guide 8, which has a built-in pilot pin for positioning and is fixed to the tip of an air cylinder 16 attached to the main body frame 17, and is vertically moved by its drive. The lead frame 7 that moves and passes through the regulation guide 8 is positioned.
[0023]
Reference numerals 12 and 13 denote proximity sensors of a mechanical type, an electrical type, an optical type, or the like, which are mounted so as to face the side surfaces of the ends of the upper detection body 1 and the lower detection body 2, respectively. The position from the upper surface and the lower surface of the lead frame 7 corresponding to the lower detector 2 is detected, and an output signal is sent out to control a supply mechanism (not shown) of the lead frame 7 and a driving mechanism of a molding die described later. I do.
[0024]
Reference numerals 32 and 33 denote recognition mechanisms and optical detection sensors provided adjacent to the regulation guide 8 on the side to which the lead frame 7 is supplied. The detection sensors 32 and 33 prevent the formation elements 7a and 7b from being mounted or missing. When an abnormality is detected, an output signal is sent out to control a supply mechanism (not shown) of the lead frame 7 and a driving mechanism of a molding die described later.
[0025]
In FIG. 4, reference numeral 18 denotes an upper die of a molding die, which is fixed to the lower surface of an upper die plate 25 fixed or movably attached to the shafts 23, 24.
[0026]
Reference numeral 19 denotes a lower die facing the upper die 18, which is fixed to the tip of a hydraulic cylinder for clamping 20 attached to the main body 22, and is fixed to the upper surface of a lower die plate 26 which can move up and down.
[0027]
Reference numerals 21 and 21a denote guide rollers for regulating and guiding the lead frame 7. The guide rollers shown in FIG. 1 are installed on the upper surface of the main body 22 adjacent to a molding die including an upper die 18 and a lower die 19. ing.
[0028]
Next, the operation will be described. The lead frame 7 on which the hoop-shaped forming elements 7a and 7b are mounted is conveyed in the direction of the arrow by a supply mechanism (not shown), and is passed through the die protection device mounted on the main body 22 and the upper roller via the guide roller 21. It is transferred and placed between the lower mold 18 and the lower mold 19 to perform a predetermined molding.
[0029]
At that time, the mold protection device in the lead frame 7 to be molded next is operated. First, the detection sensors 32 and 33 detect the presence or absence of an abnormality in the forming elements 7a and 7b. The positioning block 9 is operated by driving the cylinder 16 to position the lead frame 7 in the transport direction, and at the same time, the positioning in the vertical direction is performed by the regulating guide 8.
[0030]
Next, the upper detection body 1 and the lower detection body 2 are moved up and down by driving the air-hydro cylinders 5 and 6 at the set appropriate speed, and the lead is formed without damaging the forming elements 7a and 7b when approaching. The frame 7 is stopped at a predetermined distance or position for approaching or contacting the frame 7.
[0031]
As shown in FIG. 2, the upper detector 1, the lower detector 2 and the lead frame 7 have the dimensions A and B of the hole 1a of the upper detector 1 and the dimensions C and D of the hole 2b of the lower detector 2 as shown in FIG. The concave portions of the cavities (not shown) of the upper die 18 and the lower die 19 are similar in outer shape, and the forming elements 7a and 7b can be inserted therein.
[0032]
Therefore, if the forming elements 7a and 7b to which the lead frame 7 is attached are displaced or foreign matter is attached, the upper detector 1 does not move to a predetermined position as shown in FIG. When a gap of the distance E is generated and an abnormality of the lead frame 7 is detected by the proximity sensors 12 and 13, the output signal is transmitted when the lead frame 7 is transferred to the molding die and the supply mechanism and the closing hydraulic cylinder 20 are driven. This is transmitted to a mechanism (not shown) to stop the molding operation.
[0033]
That is, an abnormality in the lead frame 7 is detected and controlled by driving the upper detection body 1 and the lower detection body 2 of the low-cost and simple air-hydro cylinders 5 and 6.
[0034]
Even if the shape of the lead frame 7 is a strip having a predetermined size, an abnormality can be detected immediately before the mold clamping, that is, before molding.
[0035]
【The invention's effect】
As described above, according to the mold protection device of the present invention, abnormality in the lead frame can be detected in advance outside the molding die, damage to the lead frame and the forming element can be prevented, and damage or destruction of the molding die can be prevented. Can be prevented.
[Brief description of the drawings]
1A is a configuration diagram of a mold protection device according to an embodiment of the present invention, and FIG. 1B is a perspective view of a main part of the lead frame. FIG. 2 is a main part showing a relationship between the detector and the lead frame. FIG. 3 is a cross-sectional view of a main part for explaining the detection operation. FIG. 4 is a schematic front view of a configuration in which the mold protection device is mounted on a molding machine.
DESCRIPTION OF SYMBOLS 1 Upper detection body 1a Hole 2 Lower detection body 2b Hole 3, 3a Compression spring 4, 4a Compression spring 5, 6 Air-hydro cylinder 7 Lead frame 7a, 7b Forming element 8 Regulation guide 9 Positioning blocks 10, 11 Slide shafts 12, 13 Proximity sensors 14, 15 Mounting plate 16 Air cylinder 17 Main frame 18 Upper die 19 Lower die 20 Hydraulic cylinders 21, 21a for mold clamping Guide rollers 32, 33 Detection sensors

Claims (4)

A regulating guide for guiding the lead frame on which the forming element is mounted, a vertically movable positioning block attached to one end of the regulating guide and positioning the lead frame, and a recess and an outer shape of the cavity of the molding die are formed to be similar. A die protection device that controls the conveyance of a lead frame and the driving of a molding die by an output signal of a pair of vertically movable detectors provided with holes for inserting elements and a proximity sensor attached to the detectors. The mold protection device according to claim 1, wherein an air-hydro cylinder is used to drive the pair of detectors to move up and down. 2. The mold protection device according to claim 1, wherein a proximity sensor for detecting a position from the lead frame is attached to a side end of the pair of detectors, and the pair of detectors is a pair of detectors that can be expanded and contracted by a spring. The mold protection device according to claim 1, wherein a detection sensor for detecting a forming element is attached adjacent to one end of the regulation guide.

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