JP4476874B2 - Transfer molding apparatus and transfer molding method - Google Patents

Description

  The present invention includes a cavity space formed by combining a first mold and a second mold, a transfer mechanism capable of filling the cavity space with a molding material, and an ejector for releasing a molded product after sealing. A transfer molding apparatus including the mechanism and a transfer molding method.

  Conventionally, a transfer molding apparatus as shown in Patent Document 1 is known.

  FIG. 3 shows a transfer molding apparatus TM1 described in Patent Document 1.

  The transfer molding apparatus TM1 includes an upper mold 11 and a lower mold 14 that can be moved back and forth with respect to the upper mold 11, and a cavity space C can be formed by combining both the molds 11 and 14. It is said that. The cavity space C includes a molding part 23 in which the molded product 15 is arranged and a part that becomes a product after sealing is molded, and a runner part 24 that functions as a passage of molding material to the molding part 23. .

  The upper mold 11 is fixed to the base plate 10b via the mounting block 10a. On the other hand, the lower mold 14 is configured to be movable back and forth (up and down in FIG. 3) with respect to the upper mold 11 by a press mechanism (not shown).

  First and second ejector pins 21 a and 21 b that pass through the upper mold 11 and protrude into the cavity space C are supported and fixed by an ejector plate 25 and a retainer plate 26. The first ejector pin 21 a can project into the molding portion 23, and the second ejector pin 21 b can project into the runner portion 24.

  A retainer pin 31 is fixed to the ejector plate 25. The length of the retainer pin 31 is slightly longer (thicker) than that of the upper mold 11 while being fixed to the ejector plate 25. 11 and can be brought into contact with the lower mold 14. The ejector plate 25 and the retainer plate 26 are always urged by the spring 27 from the base plate 10b side to the upper mold 11 side (lower side in FIG. 3).

  On the other hand, the lower mold 14 is provided with a transfer mechanism 70 having a plunger 16 disposed through the lower mold 14, and a molding material such as a resin supplied to the pot 17 by a supply mechanism (not shown). Can be transferred to the cavity space C.

  Next, the operation of the transfer molding apparatus TM1 will be described.

  At a predetermined timing when the upper mold 11 and the lower mold 14 are opened, a molded product 15 is supplied into the mold by a supply mechanism (not shown), and the upper mold 11 and the lower mold 14 are closed. .

  At this time, the tip of the retainer pin 31 (the lower end in FIG. 3) abuts against the parting surface of the lower mold 14, so that the urging force of the spring 27 is overcome and the ejector plate 25 and the retainer plate 26 are separated from the upper mold 11. Accordingly, the front end surfaces of the first and second ejector pins 21a and 21b are retracted to the same plane as the cavity space C.

  On the other hand, a molding material such as a resin is put into the pot 17 and melted by a heater (not shown).

  After the molds 11 and 14 are closed, the plunger 16 is moved to the upper mold 11 side by the action of the transfer mechanism 70, and the molten molding material in the pot 17 is pushed into the cavity space C.

  The molds 11 and 14 are opened at a timing when the molding material is hardened to some extent, but at the same time, the retainer pin 31 that has been in contact with the lower mold 14 also moves forward (moves downward in FIG. 3). Along with this, due to the action of the spring 27 and the dead weights of the ejector plate 25 and the retainer plate 26, both the plates 25 and 26 advance to a position where they come into contact with the upper mold 11. As a result, the first and second ejector pins 21 a and 21 b simultaneously protrude into the cavity space C, and the molded product is released from the upper mold 11.

  Thereafter, the mold is released from the lower mold 14 by the lower mold ejector pin 22 on the lower mold 14 side, and the molded product is taken out by a take-out mechanism such as an arm (not shown).

JP 2001-232657 A

  However, the molded product at the time of mold opening has a strong adhesive force to the mold due to the characteristics of the molding material itself, and it may be difficult to separate from the mold even if the molded product is ejected with an ejector pin at the time of mold opening. . Further, since the elastic modulus of the molding material is low and the flexure of the molded product is large, deformation easily occurs due to the protrusion of the ejector pin. In order to prevent this, it is possible to prevent the deformation of the molded product when the ejector pin protrudes (during release) by arranging a plurality of ejector pins as appropriate. In some cases, it cannot be arranged at a required position due to restrictions.

  In such a case, the mold release is not always carried out satisfactorily, which causes problems such as breakage of the molding and peeling of the molding material.

  The present invention has been made to solve the above problems.

The present invention relates to a cavity space formed by combining a first mold and a second mold, a transfer mechanism capable of filling the cavity space with a molding material, and an ejector for releasing a molded product after molding. In the transfer molding apparatus comprising: a mechanism, the ejector mechanism includes at least a first ejector pin and a second ejector pin that can project into the cavity space, and the projecting timing of the first ejector pin and the An adjusting mechanism capable of adjusting a protrusion timing of the second ejector pin, the adjusting mechanism including an ejector plate through which the second ejector pin penetrates and capable of moving forward and backward in the cavity direction; A retainer plate that abuts the bottom of the pin of the ejector pin and is capable of moving back and forth in the direction of the cavity. Comprising a gap which is formed between the Tapureto and the retainer plate, and the second ejector pin and can abut the press pin through said retainer plate, and a biasing force imparting mechanism capable imparting a biasing force to the press pin By adopting a configuration, the above-described problems are solved.

Thereby, it becomes possible to adjust the protrusion timing of the 1st, 2nd ejector pin, and it can reduce the bending of the molded article at the time of mold release. In particular, according to the present invention, the adjusting mechanism is in contact with an ejector plate that penetrates the second ejector pin and can move forward and backward in the cavity direction, and a pin bottom of the second ejector pin, A retainer plate that can move forward and backward, a gap formed between the ejector plate and the retainer plate, a press pin that passes through the retainer plate and can come into contact with the second ejector pin, and the press pin Since the urging force applying mechanism capable of applying the urging force to the first ejector pin is configured, the projection timing of the second ejector pin can be delayed with a simple configuration, and a low-cost and reliable delay mechanism can be realized. it can.

  When the cavity space is composed of a molding part in which a product to be molded is arranged and a runner part serving as a passage of molding material to the molding part, the first ejector pin is placed in the molding part and the first The two ejector pins may be configured to protrude from the runner portion.

  As a result, it is possible to adjust the projection timing of the first ejector pin projecting from the molding part and the second ejector pin projecting from the runner part according to the molded product, and the bending of the molded product at the time of mold release is effective. Can be reduced.

  In this case, for example, the adjustment mechanism may be a delay mechanism that delays the protrusion timing of the second ejector pin from the protrusion timing of the first ejector pin.

  As a result, the mold release timing of the molded part in the molding part (the part release timing between the part where the ejector pin is not disposed and the runner part in the molding part) is synchronized by the delay of the mold release timing of the runner part, and molding is performed. Deflection of the product can be reduced.

  Further, at least one of the first ejector pin and the second ejector pin may be provided with a retraction mechanism that protrudes into the cavity space after retreating in the direction opposite to the cavity space. .

  Thereby, sticking of the molding material to the tip of the ejector pin can be eliminated in advance, and the bending of the molded product at the time of mold release can be further reduced.

  The retraction mechanism can be driven by using the driving force of the transfer mechanism, and when there is no need to drive the retraction mechanism, a blocking mechanism that blocks the driving force of the transfer mechanism. It is good also as a structure provided with.

  This makes it possible to select whether or not to retract the ejector pin in advance according to the type of molding material to be used.

  According to the present invention, it is possible to prevent breakage of a base or a frame which is a molded article, further prevent breakage or peeling of a molding material, and improve sealing accuracy.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

  FIG. 1 is a cross-sectional view of a transfer molding apparatus TM101 as an example of an embodiment of the present invention when the mold is closed. FIG. 2 is an enlarged view of the area around arrow II in FIG.

  In addition, about the existing part which is the same as that of the transfer molding apparatus TM1 which is a prior art example, the last 2 digits will attach the same code | symbol, and duplication description is abbreviate | omitted suitably.

  In FIG. 1, reference numeral 111 denotes an upper mold as a first mold. Reference numeral 114 denotes a lower mold as a second mold. A heater (not shown) as a heat source is embedded in the upper mold 111 and the lower mold 114. The upper mold 111 and the lower mold 114 constitute a mold apparatus. The upper mold 111 is attached to a fixed platen (not shown) via the attachment block 110a and the base plate 110b. The lower mold 114 is attached to the movable platen 182 via a housing 181 that houses a mounting block 110c, a base plate 144, a support plate 145, and a shutter mechanism 180 described later.

  The movable platen 182 is connected to a pressing device (not shown), and is driven forward and backward (moved in the vertical direction in FIG. 1) by driving the pressing device, so that the lower die 114 is moved toward and away from the upper die 111. The mold is closed, clamped and opened. A cavity space C is formed between the upper mold 111 and the lower mold 114 during mold clamping. The cavity space C includes a molding part 123 in which the product 115 is disposed, and a runner part 124 that guides the molding material from the pot 117 to the molding part 123.

  An ejector plate 125 and a retainer plate 126 are disposed above the upper mold 111 so as to be movable back and forth and biased downward by a spring 127. The first ejector pin 121a has a rear end, that is, an upper end in FIG. 1 fixed to the ejector plate 125 and the retainer plate 126, and extends downward through the ejector plate 125 and the upper mold 111. The lower end in FIG. 1 is disposed so as to protrude from the molding portion 123 of the cavity space C. On the other hand, the second ejector pin 121b is disposed in the runner portion 124 of the cavity space C so as to protrude. Further, the second ejector pin 121b has a pin bottom portion 193 having a diameter larger than the diameter of the pin fitted in a recess 125a provided in the ejector plate 125 (see FIG. 2). Further, a concave portion 126a that is slightly larger (in diameter and depth) than the concave portion 125a is also provided on the corresponding retainer plate 126 side. Although the length of the pin is different in the recess 126a, a first press pin 190 having substantially the same shape as the second ejector pin 121b is directed in the opposite direction to the second ejector pin 121b, and the pin bottom portions 193 of both pins 121b and 190 are disposed. , 194 are in contact with each other and are slidably disposed in the retainer plate 126. Since the size of the pin bottom portion 194 of the first press pin 190 is smaller than the size of the concave portion 126a, the first press pin 190 can move in the vertical direction by the gap A. Accordingly, the second ejector pin 121b is also movable in the vertical direction by the gap A.

  The gap A can be appropriately adjusted by changing the depth of the recess 126a or inserting a spacer or the like, for example.

  Further, a second press pin 191 is disposed inside the base plate 110b so as to correspond to the first press pin 190, and is applied downward as a biasing force applying mechanism above the second press pin 191. A spring 192 capable of applying a force is disposed. The urging force of the spring 192 is set to be stronger than the force pushed upward by the internal pressure generated when the second ejector pin 121b pushes the molding material into the cavity space C.

  In the clamped state, there is a slight gap between the upper portion of the first press pin 190 and the lower end portion of the second press pin 192 disposed on the base plate 110b. This gap is set so as to be smaller than the gap A that the first press pin 190 is accommodated in the retainer plate 126, and the second ejector pin is pressurized upward from the cavity space C as described above. The gap A is not lost even if it is pushed upward.

  Moreover, although the 1st press pin 190 and the 2nd press pin 191 are comprised as a different body, you may comprise integrally.

  In the present embodiment, the above-described gap A, the first and second press pins 190 and 191 and the spring 192 constitute a delay mechanism as an adjustment mechanism (a protrusion timing delay mechanism of the second ejector pin 121b). . Thus, the adjustment mechanism itself is not necessarily limited to the variable type.

  Although not applied in the present embodiment, the protrusion timing of each of the plurality of ejector pins 121a and 121b may be controlled separately and independently (for example, control using hydraulic pressure, air pressure, a motor, a microcomputer, etc.). .

  Reference numeral 131 denotes a return pin. The return pin 131 can be brought into contact with the parting surface of the lower mold 114 when the mold is closed and clamped, and is moved upward by the mold clamping force. The ejector plate 125 and the retainer plate 126 are retracted (moved upward in the figure), and the first and second ejector pins 121a and 121b can be retracted (moved upward in the figure). In FIG. 1, only one return pin 131 is shown, but a plurality of return pins 131 are actually provided. The ejector plate 125, the first and second ejector pins 121a and 121b, the return pin 131, the spring 127 and the like constitute an ejector mechanism of the upper mold 111.

  On the other hand, the lower die 114 is provided with an ejector plate 132 and a retainer plate 133 below the lower die 114 so as to be movable back and forth and biased downward by a spring 135. The lower mold ejector pin 122 has a rear end, that is, a lower end in FIG. 1 fixed to the ejector plate 132 and the retainer plate 133, and extends upward through the ejector plate 132 and the lower mold 114. That is, the upper end in FIG. Note that the upper end can be disposed so as to protrude from the molding portion 123.

  In addition, a cylindrical pot 117 having an open upper end and a lower end is disposed substantially at the center of the lower mold 114, and the upper end of the pot 117 is aligned with the upper surface of the lower mold 114 and is attached to the lower mold 114. Fixed. The pot 117 extends downward through the lower mold 114, the ejector plate 132 and the retainer plate 133. Further, the ejector plate 132 and the retainer plate 133 are slidably disposed with respect to the pot 117. A plunger 116 is disposed in the pot 117 so that the front end, that is, the upper end in FIG. In the state where the plunger 116 is placed at the lower limit position, a storage chamber for setting a molding material (not shown) such as a tablet is formed in the pot 117.

  The transfer mechanism 170 includes a mounting plate 152 that is moved in the vertical direction by driving a motor such as a servo motor (not shown) serving as a transfer mechanism driving unit, and a constant pressure unit 171 that is mounted on the mounting plate 152. When the mounting plate 152 moves upward, the upper end of the push-up rod 153 formed by projecting upward from the mounting plate 152 and the lower end of the third push-up pin 143 can be brought into contact with each other. (Details will be described later). In the present embodiment, the motor is used as the transfer mechanism driving unit. However, a hydraulic cylinder, a hydraulic motor, or the like can also be used. Further, as the isobaric unit 171, a spring type is used, an isobaric unit other than the spring type, for example, a hydraulic isobaric unit using hydraulic pressure, a plunger 116 and a mounting plate 152 are used. It can also be directly connected.

  The isobaric unit 171 is a cylindrical support 172 disposed in correspondence with the plunger 116, is slidably disposed in the support 172, and forms a biasing chamber 173 below the piston 174 and the piston 174. And a piston rod 161 that protrudes upward through the support body 172, and the piston rod 161 and the plunger 116 are coupled via the connecting rod 162. The biasing chamber 173 is provided with a spring or the like as a pressure equalizing biasing means for biasing the piston rod 161 upward with a substantially uniform biasing force, and the force is applied to the plunger 116 as a preload. .

  Then, in order to connect the ejector plate 125 and the retainer plate 126 disposed on the upper mold 111 side and the transfer mechanism 170, the first to third push-up pins 141 to 143, the push-up rod 153, and the third A shutter mechanism 180 serving as a blocking mechanism disposed between the push-up pin 143 and the push-up rod 153 is disposed, and the first push-up pin 141 and the return pin 131 are opposed to each other. The shutter mechanism 180 selectively blocks transmission of force (driving force) generated by the transfer mechanism 170 between the first to third push-up pins 141 to 143 and the push-up rod 153, that is, transmission of the push-up force. It is possible.

  The first push-up pin 141 in the lower mold 114, the second push-up pin 142 in the base plate 144, the third push-up pin 143 in the support plate 145, the upper limit protruding position and the lower limit retracting position. Are arranged so as to be movable in the vertical direction.

  The first to third push-up pins 141 to 143 are disposed on the same axis as the return pin 131, and the lower end surface of the return pin 131 and the upper end surface of the first push-up pin 141 are the first push-up pins 141. The lower end surface of the second push-up pin 142 and the upper end surface of the second push-up pin 142 are opposed to the lower end surface of the second push-up pin 142 and the upper end surface of the third push-up pin 143.

  Further, in order to urge the first and second push-up pins 141 and 142 downward, springs 146 and 147 as urging means are provided, respectively, and the first and second push-up pins 141 and 142 are urged by the urging force of the springs 146 and 147, respectively. The second push-up pins 141 and 142 are moved downward and placed in the retracted position. Normally, the first push-up pin 141 and the return pin 131, the first push-up pin 141 and the second push-up pin 142, and the second push-up pin 142 and the third push-up pin 143 touch each other. The ejector plate 132 and the retainer plate 133 need to be removed from the base plate 144 as the lower mold 114 is removed from the base plate 144, so that the first to third push-up pins 141 to In the state where 143 is placed in the retracted position, the first push-up pin 141 and the return pin 131, the first push-up pin 141 and the second push-up pin 142, the second push-up pin 142 and the third push-in pin It is possible to prevent the push-up pins 143 from coming into contact with each other.

  The shutter mechanism 180 includes a push-up block 184 as a force transmission member, a shutter 185 as a switching member, and a hydraulic cylinder 186 as an actuator. In the present embodiment, the hydraulic cylinder 186 is used as the actuator, but a pneumatic cylinder, a motor, or the like can also be used. The push-up block 184 is formed so as to correspond to the push-up rod 153 and protrudes upward so as to face the insertion hole 187 into which the push-up rod 153 is selectively inserted and the lower end of the third push-up pin 143. A push-up portion 188 is formed.

  The shutter 185 is slidably disposed in the horizontal direction below the push-up block 184, and drives the hydraulic cylinder 186 to move the retracted position in the first state and the advanced position in the second state (see FIG. 1 state). When the shutter 185 is placed in the retracted position and the shutter 185 is interposed between the push-up rod 153 and the push-up block 184, the push-up rod 153 is prevented from entering the insertion hole 187. Accordingly, by moving the push-up rod 153 upward, the push-up force is transmitted to the third push-up pin 143 via the shutter 185 and the push-up block 184, and therefore the first to third push-up pins 141 to 143 and the push-up force The push-up force is transmitted to and from the rod 153.

  On the other hand, when the shutter 185 is placed at the forward position and no longer interposed between the push-up rod 153 and the push-up block 184, the push-up rod 153 is allowed to enter the insertion hole 187. Therefore, even if the push-up rod 153 is moved upward, the push-up rod 153 enters the insertion hole 187, so that the push-up force is not transmitted to the third push-up pin 143. As a result, transmission of the pushing force between the first to third pushing pins 141 to 143 and the pushing rod 153 is blocked.

  The hydraulic cylinder 186 includes a cylinder 190, a piston 191 slidably disposed in the cylinder 190, and a rod 192 that connects the piston 191 and the shutter 185. The inside of the cylinder 190 is connected to the head side by the piston 191. It is divided into an oil chamber 193 and a rod side oil chamber 194. Accordingly, oil is supplied to the head side oil chamber 193 and drained from the rod side oil chamber 194 to move the shutter 185 forward (move to the left in FIG. 1), and supply oil to the rod side oil chamber 194. The shutter 185 can be moved backward (moved to the right in the figure) by draining oil from the head side oil chamber 193.

  The return pin 131, the first to third push-up pins 141 to 143, the springs 146 and 147, the push-up rod 153, and the shutter mechanism 180 described so far constitute the ejector pin retraction mechanism 195.

  Since the diameter of the first push-up pin 141 is made smaller than the diameter of the return pin 131, the lower end surface of the return pin 131 always comes into contact with the lower mold 114 when the mold is closed. Further, when trying to move the first push-up pin 141 upward at the time of mold clamping, the upper end surface of the first push-up pin 141 hits the upper mold 111 and the movement is not restricted. Therefore, the ejector plate 125 and the retainer plate 126 can be reliably retracted during mold clamping.

  Reference numeral 154 denotes an ejector rod disposed through the movable platen 182. When the movable platen 182 is retracted when the mold is opened, the upper end of the ejector rod 154 can be brought into contact with the ejection plate 155. .

  Next, although the operation of the transfer molding apparatus TM101 will be described, the overlapping portions will be omitted as appropriate.

  The workpiece 115 is set on the upper surface of the lower mold 114 by an arm (not shown), the molding material is set in the pot 117, the press device is driven, and the movable platen 182 moves forward (moves upward in the figure). When the mold is closed and the mold is clamped, a cavity space C is formed between the upper mold 111 and the lower mold 114, and the product 115 is formed by the upper mold 111 and the lower mold 114. Clamped. In the meantime, the molding material is melted by the heater.

  At this time, when the mold is closed, the movable platen 182 is advanced and the upper end of the ejector rod 154 is separated from the ejection plate 155. Thereafter, as the movable platen 182 is further advanced, the ejection plate 155 is moved relatively downward by the reaction, and the ejector plate 132 and the retainer plate 133 are retracted via the retainer push-up rod 156 (see FIG. Moved downward). Accordingly, the lower mold ejector pin 122 is retracted (moved downward in the figure) by the urging force of the spring 135. When the molding material is filled, the upper end surface of the lower mold ejector pin 122 is made to coincide with the inner peripheral surface of the cavity space C.

  Subsequently, when the transfer mechanism 70 is operated and the plunger 116 is advanced, the molding material in the pot 117 is filled into the cavity space C.

  When the molding material in the pot 117 is filled into the cavity space C, it is pressurized by the plunger 116 urged by the isobaric unit 171. As a result, the lower ends of the first and second ejector pins 121a and 121b disposed so as to protrude from the molding part 123 and the runner 124 are pressurized and are pushed upward in FIG. The first ejector pins 121a disposed in the are fixed to the ejector plate 125 and the retainer plate 126 and do not move. On the other hand, since the second ejector pin 121b disposed on the runner portion 124 is not completely fixed to the ejector plate 125 and the retainer plate 126, it tends to be pushed upward by the gap A in FIG. . However, the upper end portion of the first press pin 190 received through the retainer plate 126 is urged downward by the spring 192 so as to be able to advance and retreat in the base plate 110b, and directly above the first press pin 190. Since the contact is made with the lower end of the second press pin 191 disposed in the movement, the movement is limited.

  At this time, since the hydraulic cylinder 186 is driven and the shutter 185 is in the forward movement position, transmission of the pushing force between the first to third pushing pins 141 to 143 and the pushing rod 153 is blocked. . Accordingly, even if the push-up rod 153 is moved upward as the mounting plate 152 is moved upward, the push-up force is not transmitted to the return pin 131, and the first and second ejector pins 121a are not transmitted. , 121b is not affected.

  When the molding material in the cavity space C is cured, a molded product is completed by the molding product 115 and the molding material. The molded product includes a molded product portion made of the molding material cured in the molding portion 123 and the molded product 115 and a runner portion made of the molding material cured in the runner portion 124. Therefore, in a later process, the molded product portion and the runner portion are cut, and only the molded product portion becomes a final product such as a lead frame.

  Subsequently, when the press device is driven and the movable platen 182 is moved backward (moved downward in the drawing) to open the mold, the molded product protrudes from the upper mold 111 by the first and second ejector pins 121a and 121b. And released.

  At this time, the first ejector pin 121a disposed so as to be able to protrude from the molding portion 123 moves forward simultaneously (moves downward in FIG. 1) as the ejector plate 125 and the retainer plate 126 move forward together with the retainer pin 131. And protrude. On the other hand, the second ejector pin 121b that is disposed so as to protrude from the runner portion 124 eliminates the gap A generated between the pin bottom portion 194 of the first press pin 190 and the retainer plate 126, and the retainer plate 126 becomes the first. The first press pin 190 protrudes after coming into contact with the pin bottom 194. That is, the protrusion timing of the second ejector pin 121b disposed so as to be able to protrude from the runner portion 124 by this gap A is greater than the protrusion timing of the first ejector pin 121a disposed so as to be protrudeable to the molding portion 123. Will also be late.

  By adjusting the gap A, the protrusion timing can be arbitrarily set.

  As a result, the mold release timing of the molded part in the molding part (the part release timing between the part where the ejector pin is not disposed and the runner part in the molding part) is synchronized by the delay of the mold release timing of the runner part, and molding is performed. Deflection of the product can be reduced.

  Thereafter, as the movable platen 182 is further retracted, the ejection plate 155 is relatively moved upward, and the ejector plate 132 and the retainer plate 133 provided on the lower mold 114 side via the retainer push-up rod 156. Is moved forward (moved upward in the figure).

  As a result, the lower die ejector pin 122 is also moved forward (moved upward in the drawing), and the molded product is ejected from the lower die 114 and released.

  Next, the operation of the retraction mechanism 195 of the first and second ejector pins 121a and 121b that operates prior to the above-described mold opening operation will be described.

  Before the mold is opened, the motor is driven to move the mounting plate 152 downward so that the upper end of the push-up rod 153 is lower than the lower surface of the shutter 185, and then the hydraulic cylinder 186 is driven to move the shutter 185. Place it in the retracted position. When the motor is driven again and the mounting plate 152 is moved upward, transmission of the push-up force between the first to third push-up pins 141 to 143 and the push-up rod 153 is allowed. Accordingly, as the mounting plate 152 is moved upward, the push-up rod 153 is moved upward, and the push-up force is transmitted to the return pin 131.

  That is, as the mounting plate 152 is moved upward, the push-up rod 153, the shutter 185, the push-up block 184, the first to third push-up pins 141 to 143, and the return pin 131 are moved upward (in a direction opposite to the cavity space). ). As a result, the ejector plate 125 and the retainer plate 126 are slightly retracted and the first and second ejector pins 121a and 121b are retracted, so that the lower ends of the first and second ejector pins 121a and 121b are in the cavity space C. Move away from the molded product.

  Thereafter, the mounting plate 152 is moved downward to separate the push-up rod 153 and the shutter 185, and then the movable platen 182 is retracted to perform mold opening. In mold opening, first, the first and second ejector pins 121a and 121b are protruded from the lower mold ejector pin 122, and are released from the upper mold 111 so as to leave the molded product on the lower mold 114 side. Let me. At this time, since the lower ends of the first and second ejector pins 121a and 121b are separated from the molded product, the lower ends of the first and second ejector pins 121a and 121b again adhere to the molded product in the cavity space C. Absent. As a result, even when the first and second ejector pins 121a and 121b protrude into the cavity space C at adjusted timings, it is possible to reduce the bending of the molded product. Moreover, the certainty of mold release is improved.

  Further, since the molded product stays together with the first and second ejector pins 121a and 121b, it does not fall on the lower mold 114 away from the first and second ejector pins 121a and 121b. The parts are not damaged or the runner is not broken.

  When the mold opening is completed, the shutter 185 is placed in the retracted position again.

  In this embodiment, the ejector pin protrusion timing adjustment mechanism is provided only in the upper mold, but it may be provided on the lower mold side, or may be provided on both.

  In the above embodiment, the protrusion timing is adjusted between the ejector pin that can protrude into the molding portion of the cavity space and the ejector pin that can protrude into the runner portion. However, the type and shape of the molded product, or the runner Depending on the size, shape, etc. of the portion, the protrusion timing may be adjusted only with the ejector pins protruding from the molding portion or only with the ejector pins protruding into the runner portion. Of course, the adjustment may be performed by using both ejector pins protruding from the molding portion and ejector pins protruding from the runner portion.

  In the present embodiment, no release film is used. However, for example, the release film may be supplied to the parting surface of the upper mold.

Sectional drawing of transfer molding apparatus TM101 which is an example of embodiment of this invention Enlarged view around arrow II in Fig. 1 Sectional view of transfer molding apparatus TM1 described in Patent Document 1

Explanation of symbols

C ... Cavity space TM101 ... Transfer molding device 111 ... Upper die 114 ... Lower die 116 ... Plunger 121a ... First ejector pin 121b ... Second ejector pin 122 ... Lower die ejector pin 123 ... Molding portion 124 ... Runner portion 125 ... Ejector plate 126 ... Retainer plate 131 ... Return pin 170 ... Transfer mechanism 195 ... Retraction mechanism 196 ... Delay mechanism (adjustment mechanism)

Claims (5)

A cavity space formed by combining the first mold and the second mold, a transfer mechanism capable of filling the cavity space with a molding material, an ejector mechanism for releasing a molded product after molding,
In a transfer molding apparatus comprising:
The ejector mechanism includes at least a first ejector pin and a second ejector pin that can project into the cavity space, and adjusts a projecting timing of the first ejector pin and a projecting timing of the second ejector pin. With a possible adjustment mechanism ,
The adjusting mechanism is in contact with the ejector plate through which the second ejector pin penetrates and can move forward and backward in the cavity direction, and the pin bottom of the second ejector pin, and can move forward and backward in the cavity direction. A retainer plate, a gap formed between the ejector plate and the retainer plate, a press pin that can pass through the retainer plate and come into contact with the second ejector pin, and an urging force can be applied to the press pin A transfer molding apparatus comprising a biasing force application mechanism . In claim 1,
The cavity space is composed of a molding part in which a product to be molded is arranged and a runner part serving as a passage of molding material to the molding part,
The transfer molding apparatus, wherein the first ejector pin can project into the molding section, and the second ejector pin can project into the runner section. In claim 1 or 2,
The transfer molding apparatus, wherein the adjustment mechanism is a delay mechanism that delays the projection timing of the second ejector pin from the projection timing of the first ejector pin. In any one of Claims 1 thru | or 3 ,
Furthermore, at least one of the first ejector pin and the second ejector pin is provided with a retraction mechanism that once retracts in the direction opposite to the cavity space and then protrudes into the cavity space. . In claim 4 ,
The retraction mechanism can be driven using the driving force of the transfer mechanism, and
A transfer molding apparatus, comprising: a shut-off mechanism that shuts off the driving force of the transfer mechanism when it is not necessary to drive the retraction mechanism.

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