JP2005063914A - Method for accurately insert-molding fine pitch terminal - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for accurately insert-molding fine pitch terminals. <P>SOLUTION: A terminal line 10 on one side of a high conductive metal strip of 0.1 mm in thickness as a carrier substrate 18, is composed of the predetermined number of terminal strips 28 to be subject to an insert molding, which are arranged so as to alternate with and to be in parallel with open grooves 26 at a fine pitch of 0.3 mm and are formed by punching with the width of 0.2 mm; and comprises an intermediate part 32 and a free end 30. Before a bending process by a progressive press of the intermediate part 32, a dummy terminal board 22 is connected to the free end 30, to the tip of the free end 30 without being subject to the bending process, and thus free deformation of each terminal strip 28 by an unexpected external force is prevented to ensure reliable alignment with the die. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to continuous molding of connector terminal blocks composed of terminals arranged at a fine pitch, and more specifically, arranged at a pitch of 0.3 mm or less on a highly conductive thin plate having a thickness of 0.1 mm or less. The present invention relates to insert molding of a connector terminal block formed by forming a bent portion in a terminal piece having a width of 0.2 mm or less.

  As shown in FIG. 3, a terminal row 102 obtained by punching and molding terminals having a width w0 at a required pitch p0 on a highly conductive thin plate 100 having a thickness t0 is combined with a synthetic resin by insert molding to form a connector terminal block 104. When molding, in order to align the comb-like terminal row 102 composed of a plurality of terminals 103 arranged in parallel and extending from one side of the carrier substrate 106 with the synthetic resin molding die, it is perpendicular to the plane. It is bent (particularly the cross-sectional shape is not shown) and bent into, for example, an L shape, an inverted L shape, a U shape, an inverted U shape, or a combination thereof (in the example of FIG. 1B, the drawing is simplified) For the sake of simplicity, a crank shape bent at predetermined positions 107-1 and 107-2 is shown).

The terminal array 102 formed by bending is coupled to a spaced position at a predetermined interval along the metal strip 108 by an appropriate means, and the metal strip 108 is intermittently transferred to the synthetic resin molding die as a carrier by continuous feeding. Specifically, the connector terminal block 104 is formed by insert molding.
Japanese Patent No. 3338667

  The problem to be solved is that with the recent miniaturization required for electronic devices such as mobile phones, further miniaturization of the connection terminal portion is required. For example, each terminal 103 has a width w0 = An extremely fine shape such as 0.2 mm or less and a pitch between terminals p 0 = 0.3 mm or less is required. In this case, if the thickness t0 of the highly conductive thin plate 100 used as the terminal material is 0.1 mm, for example, the feed indicated by the arrow A as shown by the terminals 103-1 and 103-2 shown in FIG. During directional movement, the free end that is released contains the possibility of deformation under the action of an unexpected little external force.

  Therefore, the terminal row 102 extending from the carrier substrate 106 is brought into contact between adjacent terminals during the process, or the synthetic resin molding die 110 is fitted like the terminals 103-1 and 103-2 shown in FIG. If the upper mold 112 is closed as it is (the arrow B), the expensive highly conductive material composing the terminal row 102 becomes a product. Needless to say, the loss is immeasurable when the outage period of the manufacturing machine is included.

  Accordingly, an object of the present invention is to provide a method for preventing deformation until the position of each terminal is accurately maintained and integrated with a synthetic resin.

  In order to achieve the above-mentioned object, the method of insert-molding a fine pitch terminal according to the present invention with high accuracy uses a highly conductive metal strip material as a carrier substrate, and alternately opens grooves at a fine pitch on one side of the carrier substrate. A set of terminal rows formed by stamping a predetermined number of terminals arranged in parallel and facing insert molding is composed of an intermediate portion close to the carrier substrate and a free end far from the carrier substrate, and the intermediate portion Prior to the continuous bending process of intermittent feed by the progressive press, a dummy terminal plate having a length that ties the free end for each feed pitch of the progressive press, on the tip portion of the free end where the bending process does not reach, It joined by the coupling | bonding means separable along a feed direction.

  Further, the separable coupling means may be a temporary coupling by caulking or an appropriate adhesive.

  The step of insert-molding the set of terminal rows integrally with synthetic resin includes the step of bonding the dummy terminal plate to the tip portion of the free end, the step of bending the intermediate portion, and the intermediate portion formed by bending Inserting the synthetic resin into the molding die, forming the terminal block integrally with the terminal row by removing the synthetic resin, and removing the dummy terminals. .

  The method of insert-molding fine pitch terminals with high accuracy according to the present invention is particularly suitable for molding connector terminal blocks in which terminals having a width of 0.2 mm or less are arranged at a pitch of 0.3 mm or less on a conductive plate having a thickness of 0.1 mm or less. It is valid.

  Furthermore, the method of insert-molding fine pitch terminals with high accuracy according to the present invention is because the strength of each terminal is reinforced by joining dummy terminals to each inserted terminal and interconnecting the terminals. It is possible to prevent deformation of the terminals provided at a fine pitch having the portion and maintain the positional accuracy.

  For this reason, the method of insert-molding the fine pitch terminal with high accuracy according to the present invention is based on the fact that when the terminal is inserted into the synthetic resin molding die, "sagging" caused by poor alignment with the molding die of the terminal or molding die Damage can be prevented and mass productivity can be improved safely.

  Bending and insert molding with the smallest possible terminal configuration was realized without sacrificing good positional accuracy.

  FIG. 1 is a plan view (a) and sectional views (b) and (c) of a terminal row 10 of the first embodiment. One terminal row 12 before bending is shown at the right end of the plan view (a). The remaining portion is bent, and the original length N1 in the longitudinal (up and down) direction is reduced to the apparent length N2 after bending because the bent portion 14 is provided. For example, one side (the lower side in the figure) along the longitudinal direction of the highly conductive metal strip 16 having a thickness t1 = 0.1 mm is the carrier substrate 18 and an inexpensive material (for example, along the opposite end 20) (for example, A dummy terminal plate 22 having an appropriate width B1 is bonded with an appropriate overlap width F1 using a brass thin plate), and is crimped at caulking positions 24 distributed at a pitch S1 corresponding to a predetermined terminal interval. Alternatively, the entire bonding surface is bonded with a suitable adhesive. The length D1 of the dummy terminal plate 22 is set substantially equal to the width D2 of the terminal row 12 (10) bent by a press machine (not shown) for bending.

  A parallel groove 26 having a gap k1 = 0.2 mm is punched at an equal interval S2, and terminal pieces 28 having a width w1 = 0.2 mm are parallel to a plane at a predetermined pitch p1 (= S1 = S2) = 0.3 mm. The terminal row 12 to be aligned is formed. Each groove 26 opens at an edge 29 of the metal strip 16 and each terminal piece 28 extends independently from the carrier substrate 18, but the free end 30 of each terminal piece 28 is constrained by the dummy terminal plates 21 and 22. Protected against unexpected and unjustified external forces. The highly conductive metal strip 16 in which the joint portion (overlapping width F1) with the dummy terminal plate 22 is punched together to form the terminal row 12, the carrier substrate 18 is moved to the press machine in the direction of arrow M1 at an intermittent feed pitch D3. Is fed and accurately positioned in the pilot hole 19.

  The press machine bends the point e at a right angle (arrow E) at a point near the carrier substrate 18 of the terminal row 12 in one stroke (arrow E) and bends at a right angle so that it is parallel to the carrier substrate 18 at the point f (arrow F). The terminal row 12 is operated to provide a step in the surface direction between the carrier substrate 18 side and the free end 30 side. For this reason, the point g on the free end 30 side moves in the direction of the carrier substrate 18 (arrow G). For this reason, the preceding dummy terminal plate 21 is pulled by the point g of the terminal row 12 and moves in the direction of the carrier substrate 18. However, since the subsequent dummy terminal plate 22 is independent, the next bending is not affected. Wait for a stroke. In the terminal row 10 subjected to the bending process, the dummy terminal plate 22 is cut off together with a part of the free end 30 of each terminal piece 28 from the cutting position 34 near the end edge 29 of the terminal row 10.

  FIG. 2 is a schematic plan view for explaining a manufacturing process in which bending processes e and f similar to those shown in FIG. 1 are performed and the four terminals are integrally formed by insert molding. Reference numeral 40 denotes a preparation material for a terminal row, and the drawing shows a state before bending processing, which is located at a bending processing station 41 by a press machine. That is, although not shown in the drawings, the side of the highly conductive metal band 42 to be the carrier 44 is set in advance, and a generally inexpensive brass band having a suitable thickness, for example, width B2, along the side edge 46 on the opposite side. The material 48 is joined as a dummy terminal board 50 with an appropriate overlap width F2. The joining is performed by providing a caulking position 54 corresponding to each of the four terminal sets 52 or by adhering over the entire joining surface with an adhesive.

  Next, a parallel groove 56 with a gap k2 = 0.2 mm is punched, and a terminal row 60 in which terminal pieces 58 with a width w = 0.2 mm are aligned in parallel on a plane with a predetermined pitch p2 = 0.3 mm is effective length. Form with H1. Further, the terminal row 60 cuts the dummy terminal plate 50 to a length H2 at which the edge of the highly conductive metal strip 42 is completely cut for each set of four terminals 52. In addition, the dummy terminal 50 is cut by a length D4 in which eight sets of four terminals 52 are combined.

  Such a terminal row 60 including the dummy terminal plate 50 is intermittently fed at a feed pitch D5 for each set of four terminals 52 by the carrier 44 of the continuous high conductive metal strip 42. The preparatory material 40, which is only partially shown, is subjected to a length D4, which is equal to the dummy length of eight sets of the four terminal sets 52 facing the bending processing station 41 by a press at a time. Processing improves efficiency and mold life. Since the dummy terminal plate 50 is independent for each length D4, the preparation material 40 which is not subjected to the subsequent adjacent bending process is affected by the bending process of the preceding terminal row 60 including the eight sets of four terminals 52. Not receive.

  In a mode of running parallel to the carrier 44 of the highly conductive metal strip 42, the continuous insert molding carrier 62 is intermittently fed in the direction of the arrow M2 in synchronization with the molding cycle by the mold of the injection molding machine. . Reference numeral 64 denotes a crimping station. In the four-terminal set 52, the carrier 44 and the dummy terminal 50 are cut off, move along the stopper 66 in the direction of the molding carrier 62 (arrow L direction), and abut against the abutment 63. . The positioning hole 68 of the carrier 44 provided in advance and the guide hole 70 of the molding carrier 62 are aligned and positioned accurately, and the four terminal set 52 is joined to the molding carrier 62 by caulking 72.

  The molding carrier 62 sequentially feeds the four terminal set 52 and guides it into the insert molding die of the injection molding station 73. The pilot hole 74 of the molding carrier 62 engages with a positioning pin 76 of a mold (not shown), and a set of four terminals 52 aligned by the guide hole 70 in an accurate positional relationship with the pilot hole 74 is molded. Position accurately with respect to the mold. Therefore, the mold is closed by a pressurizing means by a known means, and the connector terminal block 78 is injection molded.

  The above embodiment does not limit the method of accurately insert-molding the fine pitch terminal according to the present invention. For example, within the scope of the claims of the present invention, for example, the bent shape, the thickness of the band material, the material, Can be deformed and modified in the number of integrally molded terminals, caulking locations, etc., and various aspects of the process can be changed.

  As can be seen from the above description, the method for insert molding of the fine pitch terminals according to the present invention with accuracy is the freedom of terminals for products that are automatically manufactured by continuous intermittent feed with a belt-like carrier in which terminal rows are integrated continuously. By constraining the end with a dummy terminal, the terminal can be strengthened, and a fine-structured part is processed and insert-molded in a process that requires accuracy, so that the free end of each strip extending in a comb shape from the base body It can be used for all products in which the relative position is accurately maintained and the intermediate portion is bent.

FIG. 2 is a plan view of a terminal row before insert molding and a cross-sectional side view of a fine pitch terminal according to the present invention with high precision insert molding. FIG. 4A is a plan view of a bent terminal and is bent at the right end. The part of the previous plan view is shown. (B) is sectional drawing along the BB line of (a), (c) is sectional drawing along CC line of (a). (Example 1) (Example 2) which is a typical top view explaining the manufacturing process of a 4 terminal integral molding connector terminal block by the method of insert-molding the fine pitch terminal concerning this invention accurately. It is explanatory drawing of the problem which arises in the terminal row | line | column before the conventional insert molding. It is explanatory drawing of the problem which arises by the insert molding of the conventional terminal row | line | column.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Terminal row | line | column 14 Bending part 16 High electroconductive metal strip 18 Carrier board | substrate 19 Pilot hole 22 Dummy terminal board 28 Terminal piece 29 Tip part 30 Free end 32 Middle part

Claims (4)

  A set of terminal rows in which a highly conductive metal strip is used as a carrier substrate, and a predetermined number of terminals arranged in parallel with open grooves at a fine pitch on one side of the carrier substrate to face insert molding are formed by punching. The intermediate portion close to the substrate and a free end far from the carrier substrate, wherein the free end is fed by the progressive press prior to the continuous bending process of intermittent feed by the progressive press of the intermediate portion. Insert a fine pitch terminal with high precision, characterized in that a dummy terminal plate with a length that is bundled for each pitch is joined to the tip of the free end where the bending process does not take place with a coupling means that can be separated along the feed direction. Molding method.   2. The method of insert molding a fine pitch terminal with high accuracy according to claim 1, wherein the separable coupling means is provisional coupling by caulking.   2. The method of insert molding a fine pitch terminal with high accuracy according to claim 1, wherein the separable coupling means is made of a suitable adhesive.   The step of insert-molding the set of terminal rows integrally with synthetic resin includes the step of bonding the dummy terminal plate to the tip portion of the free end, the step of bending the intermediate portion, and the intermediate portion formed by bending Inserting the synthetic resin into the molding die, forming the terminal block integrally with the terminal row by removing the synthetic resin, and removing the dummy terminals. The method of insert-molding the fine pitch terminal according to claim 1 with high accuracy.

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