WO2018096692A1

WO2018096692A1 - Protrusion mechanism for molding die, and molding die with said protrusion mechanism

Info

Publication number: WO2018096692A1
Application number: PCT/JP2016/085254
Authority: WO
Inventors: 正典反本
Original assignee: 株式会社テクノクラーツ
Priority date: 2016-11-28
Filing date: 2016-11-28
Publication date: 2018-05-31
Also published as: JPWO2018096692A1; JP6796336B2

Abstract

Provided are: a protrusion mechanism for a molding die, which enables reliable die removal and which is compact; a movable die and/or a stationary die which is provided with the protrusion mechanism; and a molding die. Provided is a protrusion mechanism for a molding die for molding a molded product 10 using a stationary die 12 and a movable die 21. The protrusion mechanism is provided with: a protrusion pin 43 using the spring reaction force of a spring 51 as the drive source; the spring 51, which causes the protrusion pin 43 to protrude; and a holder 55 mounted to an ejector plate 72 and accommodating the spring 43. The spring 51 is mounted within the holder 55 so as to cause the protrusion pin 43 to protrude, and the holder 55 limits the amount of extension of the accommodated spring 43 to within a predetermined range.

Description

Forming mechanism of molding die, molding mold having the projecting mechanism

The present invention relates to a protruding mechanism of a molding die and a molding die including the protruding mechanism.

As a molding die for a molded product having an undercut, a molding die having a two-stage protruding mechanism that performs a protruding process in two stages is known. Various types and structures of the two-stage protruding mechanism have been developed. For example, a magnet-type two-stage protruding mechanism including an upper and lower two-stage ejector plate and a magnet attached thereto, one ejector plate and a spring There are two-stage protruding mechanisms using the above (for example, see Patent Documents 1, 2, and 3).

In a molding die having a two-stage protruding mechanism described in Patent Document 1, a spring is mounted between an ejector plate and a mounting plate, a first ejector pin protrudes upward via the spring, and a second ejector The pin is projected by the ejector plate. The ejector pin protruded by the spring rises together with the ejector plate until the predetermined position is reached, and protrudes the molded product. After reaching the predetermined position, only the ejector plate rises and projects the molded product.

The molding die of Patent Document 2 adopts the same configuration as the molding die described in Patent Document 1, and an ejector pin protruding by a spring is used as an undercut pin for molding an undercut portion. On the other hand, in the resin mold described in Patent Document 3, the spring is disposed above the ejector plate.

JP 2002-172641 A Japanese Patent Laid-Open No. 5-200806 Japanese Utility Model Publication No. 2-9520

In the protruding mechanism using the spring reaction force of the spring used in Patent Document 1 to Patent Document 3 as a drive source, there are concerns about the following events. When using a protruding mechanism that uses the spring reaction force of the spring as the driving source to protrude the undercut molded core, the undercut molded core or the member that protrudes from this will be caught by another member when the undercut is pulled out. If stops in the middle, the undercut cannot be completely removed. When the undercut protrudes inside the molded product and orthogonal to the protruding direction of the molded product as shown in FIG. 1 of JP-A-2014-97628, the molded product is incompletely undercut. If protruding, the molded product will be damaged.

Even if the undercut molded core or the like is caught by another member, it is sufficient if the spring has enough force to push it, but in the case of a protruding mechanism in which the spring is disposed between the ejector plate and the mounting plate, the spring is attached. The force (spring reaction force) is the largest when the ejector plate is in the lowest position, and the spring is extended as the ejector plate moves upward, and the urging force is reduced, so it is not easy. On the other hand, in the case of a protruding mechanism in which the spring is disposed above the ejector plate, the initial protruding force is weak because the spring is extended when the ejector plate is at the lowest position.

In order to solve the above problem, even if an undercut molding core or the like is caught on another member, it is conceivable to use a spring having a large spring constant so that it can be pushed completely. Makes it difficult to make the mold compact. In addition, the protruding mechanism that uses the spring with a small spring reaction force is inefficient.

An object of the present invention is to provide a molding die protruding mechanism that can be surely punched and reduced in size, a movable side mold and / or a fixed side mold including the protruding mechanism, and a molding die. It is.

The present invention relates to a projecting mechanism of a molding die having an ejector plate, which molds a molded product by a fixed side mold and a movable side die, and includes a projecting pin that uses a spring reaction force of a spring as a driving source, and the projecting A spring that protrudes from the pin, and a holder that is attached to an ejector plate member and receives the spring, the spring being mounted to protrude the protruding pin into the holder, and the holder receives It is an extension restricting means for restricting the extension amount of the spring to a predetermined range, and the ejector plate member is an ejector plate, a member attached to the ejector plate, or a member that moves in synchronization with the ejector plate. This is a protruding mechanism of a molding die.

In the protruding mechanism of the molding die of the present invention, the holder includes an outer holder attached to the ejector plate member, and an inner holder slidably engaged with the outer holder, and the ceiling of the outer holder The surface is provided with an insertion hole through which the protruding pin is inserted, and the protruding pin has a flange that cannot pass through the insertion hole at the bottom or lower portion, and the flange is housed in the outer holder in the state where the flange is accommodated in the outer holder. The spring is mounted in the inner holder so as to protrude freely through the insertion hole, and the holder regulates the sliding amount of the inner holder with respect to the outer holder, and accommodates it. The amount of extension of the spring is regulated within a predetermined range.

Further, in the molding mechanism of the molding die according to the present invention, the inner holder is a stopper that prevents the projection pin from moving by bringing the top portion into contact with the flange and the bottom portion to the mold mounting plate in a clamped state. It is characterized by functioning.

Further, the projecting mechanism of the molding die of the present invention further has a guide pin for guiding the spring under the collar of the projecting pin, and the spring is accommodated in the holder while being inserted through the guide pin. It is characterized by that.

Further, in the protruding mechanism of the molding die of the present invention, the guide pin is a stopper that prevents the movement of the protruding pin by bringing the tip portion into contact with the bottom of the inner holder or the mounting plate of the mold in a clamped state. It functions as.

Further, in the protruding mechanism of the molding die of the present invention, the outer holder and the inner holder have an opening through which the spring accommodated therein can be visually recognized.

In addition, the protruding mechanism of the molding die according to the present invention includes an upper insertion hole through which the protruding pin can be inserted into the ejector plate member and a ridge at a lower portion of the protruding pin cannot pass, instead of the outer holder, and the upper A lower insertion hole communicating with the insertion hole and slidably locking the inner holder is provided, and the lower insertion hole regulates the sliding amount of the inner holder that is slidably locked, and the extension of the spring to be accommodated The amount is limited to a predetermined range.

Moreover, in the protruding mechanism of the molding die of the present invention, the molding die is a molding die having an undercut processing mechanism, and the protruding pin is a protruding pin for extruding the undercut processing mechanism. And

Further, the projecting mechanism of the molding die according to the present invention includes the projecting pin, the spring, and the holder as one set, or the projecting pin, the spring, the holder, and the guide pin as one set. It is characterized by being installed in plural.

Further, the present invention is a fixed side mold and / or a movable side mold provided with the protruding mechanism of the molding die.

Further, the present invention is a molding die comprising the fixed side mold and / or the movable side mold.

Further, the present invention is a molded product molded with the fixed mold and / or the movable mold, or the molding mold.

Since the protruding mechanism of the molding die of the present invention includes a protruding pin that can move independently of the ejector plate using a spring as a driving source, it protrudes in two steps with the ejector pin fixed to the ejector plate, and further protrudes with the spring. By providing a plurality of protruding pins, it is possible to project three or more stages, and even a molded product having a complicated undercut portion can be reliably punched.

In addition, since the holder for housing the spring for projecting the projecting pin regulates the extension amount of the spring to a predetermined range, the biasing force of the spring during the projecting operation is maintained high in the projecting mechanism of the molding die of the present invention. It can be surely cut out.

In addition, since the protruding mechanism of the molding die of the present invention can be configured by a protruding pin, a spring, and a holder, a complicated structure part is not required. Further, since the urging force of the spring is maintained at a high level using the holder, it is not necessary to use a large spring. For this reason, it is possible to reduce the size of the molding die protruding mechanism, the fixed side die and / or the movable side die, and further the molding die.

Further, according to the protruding mechanism of the molding die of the present invention, the spring is attached to the fixed side mold or the movable side mold while being accommodated in the holder. It is easy to incorporate the protruding mechanism. Further, even in a molding die that opens in the horizontal direction, the spring can be prevented from falling or tilting, so that the die can be removed with certainty.

Further, according to the protruding mechanism of the molding die of the present invention, the inner holder for accommodating the spring and / or the guide pin attached to the bottom of the protruding pin functions as a stopper for preventing the protruding pin from moving. Even if a large resin load is applied to the protruding pin during injection molding, the protruding pin does not move, and molding defects can be reliably prevented.

It is principal part sectional drawing of the injection mold 1 of 1st Embodiment of this invention. FIG. 5 is an enlarged view around the holder 55 of the injection mold 1 of FIG. 1. It is principal part sectional drawing which shows the state at the time of mold opening of the injection mold 1 of FIG. It is principal part sectional drawing which shows the state at the time of the molded article protrusion of the injection mold 1 of FIG. It is principal part sectional drawing which shows the state at the time of the molded article protrusion of the injection mold 1 of FIG. It is principal part sectional drawing which shows the state at the time of the molded article protrusion of the injection mold 1 of FIG. It is a figure for demonstrating the spring reaction force of the spring 51 used for the 2nd protrusion mechanism 41 of the injection mold 1 of FIG. It is a modification of the protrusion pin 43 of the injection mold 1 of 1st Embodiment of this invention. It is a modification of the holder 55 of the injection mold 1 of 1st Embodiment of this invention. It is a modification of the holder 55 of the injection mold 1 of 1st Embodiment of this invention.

FIG. 1 is a cross-sectional view of an essential part of an injection mold 1 according to the first embodiment of the present invention, and FIG. 2 is an enlarged view around a holder 55 of the injection mold 1 of FIG. FIG. 3 is a cross-sectional view of the main part showing the state of the injection mold 1 when the mold is opened, and FIGS. 4 to 6 are cross-sectional views of the main part showing the state of the injection mold 1 when the molded product is protruding. FIG. 7 is a view for explaining the spring reaction force of the spring 51 used in the second protruding mechanism 41 of the injection mold 1 of FIG. In the present embodiment, the upward and upward directions refer to the upward and upward directions in the drawing. In FIG. 1, the direction of the fixed mold 12 is the upward and upward direction.

The injection mold 1 is a mold that includes two protruding mechanisms and performs the protruding of the molded product 10 having an undercut portion in two stages, and opens the mold in the vertical direction. The injection mold 1 includes a fixed mold 12 having a cavity 14 serving as a molding surface and a movable mold 21 including a core 31 serving as a molding surface. The movable side mold 21 includes a movable side receiving plate 32 on which a core 31 is formed, and a movable side mounting plate 33 for mounting the movable side mold 21 on a die clamping mechanism side die plate (not shown) of an injection molding machine. The spacer block 34 is disposed between the movable side receiving plate 32 and the movable side mounting plate 33 and secures a movable range of the protruding mechanism.

The movable mold 21 further has an undercut processing mechanism 35. Here, the undercut is the inner undercut. The undercut processing mechanism 35 includes a forming piece 36 for forming an undercut, an inclined pin 37, an undercut forming unit 38 that projects the forming piece 36 in a direction perpendicular to the protruding direction, and an undercut forming unit 38 on the movable side. A fixing plate 39 that is fixed to the plate 32 is provided. The molding piece 36 is pushed up by a second protruding mechanism 41 described later.

The movable mold 21 further includes a first protruding mechanism 70 for protruding the molded product 10. The first protruding mechanism 70 includes an ejector plate 72 and an ejector pin 71 that is fixed to the ejector plate 72 and protrudes the molded product 10. The ejector plate 72 is provided with a protruding device (not shown) of an injection molding machine. The ejector rod 85 that transmits the protruding power applied to the ejector plate 72 is bolted. Further, a return pin 87 through which a compression coil spring 86 is inserted is fixed to the ejector plate 72 so as to project the ejector plate 72 and return it to the previous position.

The ejector plate 72 includes an upper ejector plate 72b and a lower ejector plate 72a, and is bolted to form one ejector plate. The ejector plate 72 has a counterbore type plate structure, and sandwiches and fixes the ejector pins 71 protruding from the molded article 10 and the bottoms of the return pins 87.

The second protruding mechanism 41 is a protruding mechanism that protrudes (pushes up) the molding piece 36 of the undercut processing mechanism 35, and includes a protruding pin 43 that pushes up the forming piece 36, a spring 51 that biases the protruding pin 43 in the protruding direction, A holder 55 for accommodating the spring 51 and a guide pin 52 for guiding the spring 55 are provided.

The protruding pin 43 is a stepped pin provided with an enlarged portion 47 from the center to the lower portion, and has a disk-shaped ridge 50 larger than the enlarged portion 47 of the pin main body 46 at the bottom. The flange 50 functions as a stopper for the ejector plate 72 of the protruding pin 43. The enlarged portion 47 is a movement amount regulating means for regulating the movement amount of the protruding pin 43. The position of the upper end 48 of the enlarged portion 47 is such that the movement amount (stroke amount) of the protruding pin 43 causes the molding piece 36 to move under. The height L1 is set so as to be necessary for removing the cut. When the upper end 48 of the enlarged portion 47 is in contact with the fixed plate 39 or the movable side receiving plate 32, no further protrusion can be performed.

鍔 50 may be fixed to the pin body 46 with a bolt or the like, or may be formed integrally with the pin body 46. The enlarged portion 47 may also be formed integrally with the pin body 46, or may be formed by inserting into the pin body 46 with a sleeve structure.

The spring 51 is formed of a compression coil spring, is inserted into a guide pin 52 attached to the bottom of the protruding pin 43 so as to be extendable and retracted, is accommodated in the holder 55 in a state of being inserted through the guide pin 52, and the flange 50 of the protruding pin 43 is Push up. The strength (spring reaction force), action, and biasing force of the spring 51 will be described in the operation of the injection mold 1 to be described later when the molded product protrudes and the action of the protrusion mechanism.

The guide pin 52 is a member that guides the spring 51, is made of a round bar, and protrudes toward the movable side mounting plate 33 and is fixed to the bottom of the pin 43. The guide pin 52 functions as a guide that protrudes the spring 51 and holds it on the central axis of the pin 43. For this reason, the outer diameter of the guide pin 52 is preferably slightly smaller than the inner diameter of the spring 51 so that the spring 51 can be inserted and does not wobble. As a result, even in a mold that opens in the horizontal direction, the spring 51 can be protruded and held on the central axis of the pin 43.

The length of the guide pin 52 is preferably longer due to the function of the guide pin 52. On the other hand, since the guide pin 52 is located in the inner holder 65, it needs to have a length accommodated in the inner holder 65 in the mold clamping state. In the injection mold 1, a resin pressure is applied so as to press down the molding core 36 at the time of injection. Therefore, if the length of the tip 54 of the guide pin 52 is in contact with the bottom 68 of the inner holder 65 in the mold clamping state, the guide pin 52 also functions as a stopper that prevents the pin 43 from being pushed down.

The holder 55 is a mounting tool for receiving the spring 51 and mounting the spring 51 so that the protruding pin 43 protrudes. The holder 55 is also a spring extension regulating means that regulates the extension amount of the spring 51 within a predetermined range so that the spring reaction force of the spring 51 falls within a predetermined range.

The holder 55 includes an outer holder 56 that is attached to the ejector plate 72, and an inner holder 65 that is located in the outer holder 56 and that is slidably locked to the outer holder 56. The holder 55 is attached to the ejector plate 72 such that the central axis protrudes and coincides with the central axis of the pin 43.

The outer holder 56 is a cylindrical member and has a fixing collar 58 on the outer wall surface. The ejector plate 72 is provided with a through hole 75 into which the outer holder 56 is fitted. The outer holder 56 is fitted into the through hole 75, and the flange 58 is sandwiched and fixed between the lower ejector plate 72a and the upper ejector plate 72b. Yes.

When the outer holder 56 is fixed to the ejector plate 72, the upper surface 57 is flush with the upper surface 74 of the ejector plate 72, and the bottom (lower end) 59 abuts against the movable side mounting plate 33 in the mold clamping state. The outer holder 56 is provided with an opening (not shown), such as a slit, through which the spring 51 accommodated in the inner holder 65 can be seen. The size, shape, and number of the openings are not particularly limited as long as the strength required for the outer holder 56 is ensured.

The inner diameter of the outer holder 56 differs in the height direction. The upper part of the outer holder 56 is a hole 60a through which the enlarged portion 47 of the protruding pin 43 slides freely. For this reason, the flange 50 of the protruding pin 43 cannot pass through this portion. A lower portion of the outer holder 56 is a hole 60c through which the inner holder 65 slides. The flange 50 of the protruding pin 43 cannot pass through the hole 60c.

The center portion of the outer holder 56 is a hole 60b that is slightly larger than the flange 50 of the protruding pin 43 and communicates with the upper hole 60a and the lower hole 60c. Therefore, the boundary between the upper hole 60a and the central hole 60b is a stepped portion 62, and the boundary between the lower hole 60c and the central hole 60b is a stepped portion 63. The height of the central hole 60 b is determined from the amount of movement of the inner holder 65.

The inner holder 65 is a cylindrical member with a bottom and an open top, and has a flange 67 on the outer wall surface of the ceiling. The diameter of the flange 67 is substantially the same as the flange 50 of the protruding pin 43. For this reason, the flange 67 can pass through the hole 60 b in the center of the outer holder 62, but cannot pass through the hole 60 a in the upper part and the hole 60 c in the lower part of the outer holder 56.

Similarly to the outer holder 56, the inner holder 65 is also provided with an opening (not shown), for example, a slit, through which the spring 51 accommodated in the inner holder 65 can be seen. The size, shape, and number of the openings are not particularly limited as long as the strength required for the inner holder 65 is ensured. As described above, by providing the outer holder 56 and the inner holder 65 with the opening portion through which the spring 51 can be visually recognized, even when the spring 51 is broken, this can be easily found.

The inner diameter of the inner holder 65 is substantially the same as the outer diameter of the spring 51, and the spring 51 can be expanded and contracted within the inner holder 65. The length of the inner holder 65 is set so that the bottom (lower end) 68 abuts on the movable side mounting plate 33 in the mold clamping state, and the inner holder 65 protrudes in the mold clamping state and the pin 43 is pushed down. It also functions as a stopper to prevent this. If the inner diameter of the inner holder 65 is substantially the same as the outer diameter of the spring 51 as in this embodiment, the inner holder 65 also functions as a guide for the spring 51. In such a case, the guide pin 52 may be omitted.

In the inner holder 65, a flange 67 is slidably fitted into a hole 60b in the center of the outer holder 56. The maximum movable amount A of the inner holder 65 is obtained by subtracting the thicknesses of the

flanges

50 and 67 from the height of the central hole 60b, and the maximum extension amount of the spring 51 is also the maximum movement amount A. . The maximum movement amount A is L1> A when the maximum protrusion height of the protruding pin 43 is L1 (see FIG. 7).

With respect to the holder 55 configured as described above, the protruding pin 43 is inserted so that the flange 50 passes through the hole 60 b in the center portion of the outer holder 56 and the enlarged portion 47 of the protruding pin 43 passes through the hole 60 a in the upper portion of the outer holder 56. Mounted. At this time, the inner holder 65 is located below the flange 50 of the protruding pin 43 and accommodates the spring 51 inserted through the guide pin 52.

Next, the operation of the injection mold 1 when the molded product protrudes and the operation of the protruding mechanism will be described.

The injection mold 1 is subjected to an injection process and a cooling process, and then the mold is opened and the molded product 10 is projected. In the injection process, the injection mold 1 is in the state shown in FIG. 1. At this time, the tip of the protruding pin 43 contacts the undercut molding unit 38, and the flange 50 contacts the upper step 62 of the outer holder, The ceiling 66 of the inner holder is in contact with the flange 50, and the bottom (lower end) 68 of the inner holder is in contact with the movable side mounting plate 33. Therefore, the positions of the molding piece 36 and the protruding pin 43 and the like do not drop even when the resin pressure is applied to the molding piece 36 and the protruding pin 43 and the like as it is pushed down.

After the cooling step, the movable side mold 21 is retracted through a mold clamping device (not shown) to open the mold, and the molded product 10 is taken out between the fixed side mold 12 and the movable side mold 21. The space for this is secured (see FIG. 3). At this time, the spring 51 is in a compressed state, and the spring reaction force at this time is F ₀ (see FIG. 7). The ejector pin 43, acts a spring reaction force F ₀ of the spring 51, ejector pin 43 can not rise because the flange 50 is caught on the step portion 62 of the outer holder.

When the process proceeds to the projecting process, the ejector rod 85 moves forward with the power of the projecting device (not shown) of the injection molding machine, and the ejector plate 72 connected to the ejector rod 85 rises. As a result, the fixed ejector pin 71 also moves in the protruding direction and pushes up the molded product 10. At this time, the outer holder 56 is fixed to the ejector plate 72. However, since the inner holder 65 is slidable with respect to the outer holder 56, the spring 51 in the inner holder 65 also extends. Until the ejector plate 72 reaches point A, the spring 51 continues to extend.

FIG. 4 shows a state where the ejector plate 72 has moved to the point _A , and shows the spring reaction force FA of the spring 51 acting on the protruding pin 43 (see FIG. 7). Even at this stage, the protruding pin 43 is in a state in which the flange 50 is hooked on the upper step portion 62 of the outer holder, so that it cannot be raised further even if it is biased to protrude by the spring 51. And the projecting pin 43 rise together. When the ejector plate 72 moves to the point A, the flange 67 of the inner holder 65 contacts the lower step portion 63 of the outer holder.

After that, the ejector plate 72 continues to rise. At this time as well, the hook 50 is in a state of being caught by the upper step portion 62 of the outer holder, so that the ejector plate 72 and the projecting pin 43 rise together. During the period from when the ejector plate 72 reaches the point A until the point L1 is reached, the spring 51 cannot extend because the flange 67 of the inner holder 65 is in contact with the lower step portion 63 of the outer holder. Therefore, the spring reaction force of the spring 51 during this period is constant at F _A (see FIG. 7). The inner holder 65 also rises together while being caught by the outer holder 56.

When the ejector plate 72 protrudes by the height L1, the upper end 48 of the enlarged portion of the protruding pin 43 abuts against the fixed plate 39 and the pin 43 is prevented from rising. FIG. 5 shows a state in which the upper end 48 of the enlarged portion of the protruding pin 43 has abutted against the fixed plate 39. At this time, the molding piece 36 moves to the left and the undercut is removed. At this time, the protruding pin 43 is pushed up by a spring reaction force F ₁ = F _A of the spring 51 (see FIG. 7).

As described above, in the present injection mold 1, the protruding pin 43 is protruded by the spring reaction force F _A of the spring 51 until the L 1 point is reached after the ejector plate 72 reaches the A point. On the other hand, in the case of a mold that does not include the holder 55, the spring 51 continues to extend after reaching the point A, and when the ejector plate 72 reaches the point L1, the spring reaction force of the spring 51 is F ₁ '. (See FIG. 7). As shown in FIG. 7, by providing the holder 55 and restricting the extension of the spring 51, the protruding force of the protruding pin 43 can be increased by a maximum ΔF.

In the case of the conventional protruding mechanism in which the spring is arranged between the ejector plate and the mounting plate, the urging force (spring reaction force) of the spring decreases as the ejector plate moves upward. It has been a problem that this cannot be canceled when it is caught on the member. On the other hand, in the present injection mold 1, the holder 55 is provided and the spring reaction force of the spring 51 is kept high, so that the conventional problem can be solved.

When the upper end 48 of the enlarged portion of the protruding pin 43 hits the fixed plate 39, the protruding pin 43 stops rising, but the ejector plate 72 continues to rise. As a result, the distance between the flange 50 of the protruding pin 43 and the ceiling portion 66 of the inner holder is reduced, and the spring 51 is compressed and the spring reaction force F increases (see FIG. 7), but the ejector plate 72 is protruded from the injection molding machine. It is not pushed down because it is supported by the device.

The maximum push-up height of the ejector plate 72 is the height of L1 + L2 from the initial position, and the ejector pin 71 fixed to the ejector plate 72 also moves to the height of L1 + L2 from the initial position, thereby protruding the molded product 10 ( (See FIG. 6).

When the extrusion of the molded product 10 is completed, the process proceeds to the mold clamping process. When the process proceeds to the mold clamping process, the protruding device (not shown) of the injection molding machine moves backward from the movable side receiving plate 32 side to the movable side mounting plate 33 side. Further, the ejector plate 72 that has lost the projecting power of the projecting device of the injection molding machine is retracted from the movable side receiving plate 32 side to the movable side mounting plate 33 side by the spring reaction force of the compression coil spring 86 and the spring 51. When the ejector plate 72 is retracted from the maximum projecting position by the height L2, the upper step portion 62 of the outer holder projects and hits the flange 50 of the pin 43.

Thereafter, the protruding pin 43 is lowered integrally with the ejector plate 72, and when it is lowered to the point A, the bottom (lower end) 68 of the inner holder contacts the movable side mounting plate 33 (see FIG. 4). When the ejector plate 72 is further lowered, the bottom 68 of the inner holder is pushed by the movable side mounting plate 33, and the spring 51 is also compressed. Eventually, the tip of the return pin 87 comes into contact with the solid-side mold 12, and the ejector plate 72 is pushed back to the position before the original protrusion. Thereby the spring 51 is compressed to a state of the spring reaction force F _0.

In the present injection mold 1, the second protruding mechanism 41, which basically includes the protruding pin 43, the spring 51, and the holder 55, moves independently of the ejector plate 72 using the spring reaction force of the spring as a driving source. Therefore, a plurality of second protruding mechanisms 41 can be provided for one ejector plate 72, and multistage protrusion can be easily performed by varying the stroke amount of the protruding pin 43. Even with such an injection mold that performs multi-stage extrusion, only one ejector plate 72 is required, so that the mold can be made compact.

Next, a modification of the injection mold 1 of the first embodiment will be shown. FIG. 8 is a modification of the protruding pin 43 of the injection mold 1 according to the first embodiment of the present invention. The same components as those of the injection mold 1 of the first embodiment shown in FIGS. 1 to 7 are denoted by the same reference numerals, and description thereof is omitted.

In the injection mold 1 of the first embodiment, the enlarged portion 47 is used as the movement amount regulating means for regulating the movement amount of the protruding pin 43. However, instead of the enlarged portion 47, a flange 49 is provided as shown in FIG. May be. The shape of the flange 49 is not particularly limited, and the flange 49 may be fixed to the pin body 46 with a bolt or the like, or may be formed integrally with the pin body 46.

FIGS. 9 and 10 are modifications of the holder 55 of the injection mold 1 according to the first embodiment of the present invention, both of which are in a clamped state. In the injection mold 1 of the first embodiment, the inner holder 65 is used as a stopper for preventing the movement of the protruding pin 43 in the clamped state, but the guide pin 52 may be used as a stopper together with the inner holder 65. An example in which the inner holder 65 and the guide pin 52 are used as stoppers is shown in FIG.

In the holder 55 shown in FIG. 9, a through hole 69 through which the guide pin 52 can be inserted is formed in the bottom 68 of the inner holder. The guide pin 52 used here is longer in length than the guide pin 52 of the first embodiment, and the distal end portion 54 enters the through hole 69. The distal end portion 54 of the guide pin 52 is in the mold clamping state. It contacts the movable side mounting plate 33. Thereby, the inner holder 65 and the guide pin 52 can be used as a stopper for preventing the movement of the protruding pin 43 in the clamped state.

Next, instead of the outer holder 56, an example in which through holes 76 (76a, 76b, 76c) into which the inner holder 65 is slidably fitted is provided in the ejector plate 72 is shown in FIG. This can be said that the outer holder 56 is directly provided on the ejector plate 72.

The through hole 76 into which the inner holder 65 is slidably fitted is provided in the same manner as the outer holder 56. The upper part of the through hole 76 is a hole 76a in which the enlarged portion 47 of the protruding pin 43 slides freely. For this reason, the flange 50 of the protruding pin 43 cannot pass through this portion. A lower portion of the through hole 76 is a hole 76c through which the inner holder 65 slides. The flange 50 of the protruding pin 43 cannot pass through the hole 76c.

The central portion of the through hole 76 is a hole 76b having a diameter slightly larger than the flange 50 of the protruding pin 43, which communicates with the upper hole 76a and the lower hole 76c. Therefore, the boundary between the upper hole 76a and the central hole 76b is a stepped portion 62, and the boundary between the lower hole 76c and the central hole 76b is a stepped portion 63. The height of the central hole 76b is determined by the amount of movement of the inner holder 65.

10 is compared with the holder 55 of the first embodiment, the holder shown in FIG. 10 does not have a portion corresponding to the outer holder 56 protruding from the ejector plate 72 of the first embodiment. The holder 55 of the first embodiment is formed so that the bottom portion 59 of the outer holder 56 also contacts the movable side mounting plate 33 when the mold is clamped, but this is not an essential requirement. As described above, the holder 55 can be formed by the through hole 76 provided in the ejector plate 72 and the inner holder 65.

As explained in the above embodiment, the protruding mechanism of the molding die according to the present invention has the first protruding mechanism using the ejector plate as a driving source and the second protruding mechanism using the spring as the driving source, and the protruding mechanism. Can be moved independently of each other, so that even a molded product having a complicated undercut portion can be reliably punched. In addition, both the first protruding mechanism and the second protruding mechanism do not require complicated parts, the number of parts is small, the structure is simple and the assembly is easy, the molding mold protruding mechanism, the fixed side mold and / or the movable side mold, Furthermore, the mold can be made compact and inexpensive.

Particularly, in the second protruding mechanism, the holder for accommodating the spring that protrudes the protruding pin restricts the extension amount of the spring to a predetermined range, so that the urging force of the spring is maintained at a high state during the protruding operation, and the die is reliably removed. be able to. By using the holder, it is not necessary to use a large spring, and the protruding mechanism of the molding die, the fixed side die and / or the movable side die, and further the molding die can be miniaturized.

Further, since the protruding mechanism of the molding die according to the present invention is attached to the fixed side mold or the movable side mold while the spring is accommodated in the holder, the main protrusion to the fixed side mold or the movable side mold is performed. It becomes easy to incorporate the mechanism. Further, even in a molding die that opens in the horizontal direction, the spring can be prevented from falling or tilting, so that the die can be removed with certainty.

Further, according to the protruding mechanism of the molding die of the present invention, the inner holder for accommodating the spring and / or the guide pin attached to the bottom of the protruding pin functions as a stopper for preventing the protruding pin from moving. Even when a large resin load is applied to the protruding pin during injection molding, the protruding pin does not move, and molding defects can be reliably prevented.

The projecting mechanism of the molding die of the present invention, the fixed side mold and / or the movable side mold and the molding die provided with the projecting mechanism are not limited to the above-described embodiments, and may be appropriately selected within the scope not changing the gist. Can be changed and used. In the above embodiment, the holder 55 that accommodates the spring 51 is attached to the ejector plate 72, but the holder 55 is attached to the ejector plate 72 and moves integrally with the ejector plate 72, or the ejector plate 72. You may attach to the member which moves synchronously. In the above embodiment, the flange 50 is provided at the bottom of the protruding pin 43, but the flange 50 may be a lower portion of the protruding pin 43.

In the above embodiment, the core 31 is directly formed on the movable side receiving plate 32. However, a core may be formed there by providing a movable side mold plate, and the core may be nested. In this embodiment, the undercut is an inner undercut. However, the undercut may be an outer undercut, and the undercut processing mechanism is not limited to this configuration. Further, the number of ejector pins 71 that are fixed to and protrude from the ejector plate 72 is not particularly limited.

In the injection mold 1 shown in the above embodiment, the second protruding mechanism 41 including the protruding pin 43, the spring 51, and the holder 55 moves independently of the ejector plate 72 using the spring reaction force of the spring as a driving source. Therefore, a plurality of second protruding mechanisms 41 can be provided for one ejector plate 72, and multistage protrusion can be easily performed by varying the stroke amount of the protruding pin 43. Even with such an injection mold that performs multi-stage extrusion, only one ejector plate 72 is required, so that the mold can be made compact. The same applies to the second protruding mechanism 41 including the protruding pin 43, the spring 51, the holder 55, and the guide pin 52.

Moreover, the material of each component used for the projection mechanism of the molding die of the present invention, the fixed side die having the projection mechanism, the movable side die, and the molding die is not limited to a specific material. What is necessary is just to use suitably the same thing as the material of the member used for a well-known molding die. However, it is preferable to use a material having a good slidability or a material subjected to a surface treatment having a good slidability for the sliding surface of each constituent member. Each sliding surface is not limited to surface contact, and may be line contact or point contact.

Further, in the molding die of the present invention, corners and side ridges of each component member may be subjected to R chamfering or C chamfering.

Further, the molding die of the present invention is not limited to a molding die that opens and closes up and down, and may be a molding die that opens and closes in the left and right or another direction.

Further, the molding mechanism of the molding die of the present invention, a fixed side mold, a movable side mold, and a molding die provided with the projection mechanism are mold molds such as die casting molds, mold press molding in addition to injection molds. It can be suitably used for a mold or the like.

As described above, the preferred embodiments have been described with reference to the drawings. However, those skilled in the art will readily consider various changes and modifications within the obvious range by looking at the present specification. Therefore, such changes and modifications are interpreted as being within the scope of the invention defined by the claims.

1 Injection Mold 10 Molded Product 12 Solid Side Mold 21 Movable Side Mold 33 Movable Side Mounting Plate 35 Undercut Processing Mechanism 36 Molding Piece 37 Inclined Pin 38 Undercut Molding Unit 41 Second Projecting Mechanism 43 Projecting Pin 47 Pin Body Enlarged portion 50 鍔 51 Spring 52 Guide pin 55 Holder 56 Outer holder 60b Hole 62 at the center of the outer holder Stepped portion 63 above the outer holder 63 Stepped portion 65 under the outer holder Inner holder 66 Inner holder Ceiling portion 68 Inner holder Bottom portion 70 First protruding mechanism 71 Ejector pin 72

Ejector plates

76, 76a, 76b, 76c Ejector plate through-hole

Claims

A molding die projecting mechanism comprising an ejector plate for molding a molded product with a fixed side mold and a movable side mold,
A protruding pin that uses the spring reaction force of the spring as a drive source;
A spring projecting the projecting pin;
A holder attached to the ejector plate member and containing the spring;
With
The spring is mounted in the holder so as to protrude the protruding pin,
The holder is an extension regulating means for regulating an extension amount of the spring to be accommodated within a predetermined range,
The ejector mechanism of a molding die, wherein the ejector plate member is an ejector plate, a member mounted on the ejector plate, or a member that moves in synchronization with the ejector plate.
The holder has an outer holder attached to the ejector plate member, and an inner holder slidably locked to the outer holder,
The ceiling surface of the outer holder is provided with an insertion hole through which the protruding pin is inserted,
The protruding pin has a flange that cannot pass through the insertion hole at the bottom or the lower part, and is inserted into the insertion hole so as to be movable in a state in which the flange is accommodated in the outer holder,
The spring is mounted in the inner holder so as to protrude the flange of the protruding pin,
2. The molding die protruding mechanism according to claim 1, wherein the holder regulates a sliding amount of the inner holder with respect to the outer holder, and regulates an extension amount of the spring to be accommodated within a predetermined range.
The said inner holder functions as a stopper which makes the top part contact | abut to the said collar | hook and a bottom part to the mounting plate of a metal mold | die in a mold-clamping state, and prevents the said protrusion pin from moving. Extrusion mechanism for molding dies.
Furthermore, it has a guide pin for guiding the spring under the flange of the protruding pin,
4. The molding die protruding mechanism according to claim 2, wherein the spring is accommodated in the holder in a state of being inserted through the guide pin. 5.
The said guide pin functions as a stopper which makes a front-end | tip part contact | abut to the bottom part of the said inner holder, or the mounting plate of a metal mold | die in a clamping state, and prevents the said protrusion pin from moving. The protruding mechanism of the described mold.
The molding mechanism for projecting a molding die according to any one of claims 2 to 5, wherein the outer holder and the inner holder have an opening through which the spring accommodated therein can be visually recognized.
Instead of the outer holder, the protruding pin can be inserted into the ejector plate member, the upper insertion hole through which the flange at the lower part of the protruding pin cannot pass, and the inner holder is slidable in communication with the upper insertion hole A lower insertion hole for locking is provided,
The lower insertion hole restricts the sliding amount of the inner holder that is slidably locked, and restricts the extension amount of the spring to be accommodated within a predetermined range. 3. A protruding mechanism for the molding die according to the item.
The molding die is a molding die having an undercut processing mechanism,
The protruding mechanism for a molding die according to any one of claims 1 to 7, wherein the protruding pin is a protruding pin for extruding the undercut processing mechanism.
The protruding pin, the spring and the holder are set as one set,
Or the protruding pin, the spring, the holder and the guide pin as one set,
9. The molding die protruding mechanism according to claim 1, wherein a plurality of the sets are attached.
A fixed-side mold and / or a movable-side mold comprising the molding die protruding mechanism according to any one of claims 1 to 9.
A molding die comprising the fixed side mold and / or the movable side mold according to claim 10.
A molded product molded with the fixed side mold and / or the movable side mold according to claim 10 or the molding die according to claim 11.