JP5307635B2 - Cassette type die cutting mold - Google Patents

Description

  The present invention relates to a cassette type punching die injection mold that is detachably attached to a mother die.

  In general, molded articles made of synthetic resin or the like include those having an undercut portion formed by an intricate step consisting of a concave portion and a convex portion, and those having no undercut portion.

  For molded products with a simple shape without undercuts, simply remove the mold that forms the outside of the cavity after molding, and then remove the molded product solidified in the cavity from the core mold. The molded product can be taken out from the outside.

  For unit-type injection molding in which a pair of mold bodies consisting of a core and a cavity for molding a molded product such as a synthetic resin is configured as a removable middle mold with respect to an outer frame mounted on an injection molding machine A mold is known as a prior art (see, for example, Patent Document 1).

  By the way, in recent years, an imaging apparatus frequently used in the video field incorporates a lens barrel that slides forward and backward from within the main body. Although such a lens barrel is small, various undercut portions are formed on the inner and outer peripheral surfaces of the frame.

  The mold for molding a molded product having an undercut portion uses a slide mold as a core mold, and the center of the slide mold is positioned before taking out the molded product from the mold. It is necessary to first cut the undercut portion of the core mold from the undercut portion of the molded product by removing the core and moving the slide mold in the central axis direction.

JP-A-01-306216

  However, when a new product is developed for a digital camera, the shape of the lens barrel incorporated in the new product is also changed, that is, changed. Therefore, for each lens barrel product to be newly produced, the entire mold attached to the molding machine must be remodeled for the lens barrel mold, which requires a lot of time for the molding setup change and shortens the delivery time. There was a problem of obstructing the plan.

  Similarly, since the entire mold to be attached to the molding machine has to be remade, there is a problem that the cost for manufacturing the mold is increased and the reduction of the cost of the molded product is hindered.

  Therefore, the above-mentioned problem can be solved if the mold for lens barrel molding is made unit-type as in Patent Document 1 and the mold attached to the molding machine is made a common outer frame and exchangeable middle-type (unit-type). However, the conventional unit-type mold has a problem that it cannot cope with the leading-out mechanism.

  In order to solve the above-mentioned problems, the cassette type die-cut injection mold of the present invention is formed as a cassette-type die cut in an injection mold in which a movable mold part is pre-cut. A tension bolt connected at one end to a mold part to be punched, a sleeve surrounding a peripheral surface of the tension bolt, a hook member connected by a screw to the other end of the tension bolt, and a movable attachment It has a bush fixed to the board, and a pin for positioning the bush and the sleeve.

  Since the present invention is composed of a mother mold having a common function and a cassette mold that can be exchanged for this mother mold, the cassette mold can be used for a punching mechanism. On the other hand, it is not necessary to remodel the entire mold attached to the molding machine, and only the cassette mold part needs to be remodeled, so that the time required for the molding setup change can be shortened, thereby contributing to shortening the delivery time. There is an effect.

  Similarly, since it is not necessary to remodel the entire mold attached to the molding machine for the new product, it is only necessary to remodel the cassette mold part, thus reducing the cost of mold production and reducing the cost of the molded product. The effect that it can contribute is produced.

It is sectional drawing which shows the structure at the time of mold closing of the metal mold | die which concerns on Example 1 of this invention. It is sectional drawing which shows the state at the time of the mold opening of the metal mold | die which concerns on Example 1 of this invention. It is sectional drawing which takes out and shows only the cassette type metal mold | die at the time of mold closing of the metal mold | die which concerns on Example 1 of this invention. It is sectional drawing which shows in detail the structure of the principal part of the cassette side movable mold | type of the cassette type metal mold | die which concerns on Example 1 of this invention. It is a perspective view which shows the structure of the tension | pulling bolt of the cassette side movable type | mold of the cassette type metal mold | die which concerns on Example 1 of this invention. It is a perspective view which shows the structure of the cassette side movable sleeve of the cassette type metal mold | die which concerns on Example 1 of this invention. It is a perspective view which shows the structure of the cassette side movable type bush of the cassette type metal mold | die which concerns on Example 1 of this invention. It is a perspective view which shows the structure of the cassette side movable type hook member of the cassette type metal mold | die which concerns on Example 1 of this invention.

  Hereinafter, embodiments of the present invention will be described in detail.

  FIG. 1 is a cross-sectional view showing a configuration of a mold according to Example 1 of the present invention when the mold is closed. In FIG. 1, the injection molding machine is not shown. As shown in FIG. 1, the mold of this example is configured as a mold 1 attached to an injection molding machine as a mold having a common function, and a replacement mold that is detachable from the mold 1. The cassette type mold 2 is used.

  The mother die 1 includes a fixed die 3 and a movable die 4. The fixed mold 3 is fixed in close contact with a fixed mold mounting plate 5, a stripper plate 6 mounted on the fixed mold mounting plate 5, and a parting surface 7 for taking out the resin flow part. A mold 8 and a fixed mold mounting plate 5, a stripper plate 6, and a fixed mold plate 8 are provided so as to fit into the movable mold 4 and guide the mold release operation of the fixed mold plate 8 in a certain direction. The fixed side guide pin 9 is provided.

  The fixed mold mounting plate 5 is provided with a locating ring 11 and a sprue bushing 12 that form a resin injection port into the resin flow portion, and the fixed mold plate 8 has a fixed mold for the cassette mold 2. The cassette side fixed mold 13 is arranged by inserting the rail grooves 10a and 10b together with the cassette side movable mold while fitting the rail grooves 10a and 10b to the rail (not shown) of the mother mold 1.

  From the resin inlet of the sprue bushing 12, the cassette side fixed die 13 passes through the sprue bushing 12, the fixed die mounting plate 5, the stripper plate 6, and the fixed die plate 8, and the sprue 14 of the resin flow portion, cylindrical shape It is formed by the mold member 15.

  A runner 16 dug into the boundary surface of the cassette side fixed mold 13 is formed in communication with the sprue 14 at the boundary surface between the fixed mold plate 8 and the cassette side fixed mold 13. Further, a gate 17 communicates with the runner 16 and penetrates the cassette side fixed mold 13 and communicates with a movable cavity 18 of the cassette mold 2 via a parting surface 19 for taking out a molded product.

  The movable die 4 of the mother die 1 is in close contact with the movable die mounting plate 21, the receiving plate 22 attached to the movable die attaching plate 21, and the parting surface 23 for pre-cutting. The movable mold plate 24, the mold release operation of the movable mold plate 24, and the mold release operation of the receiving plate 22 are guided through the movable mounting plate 21 and the receiving plate 22 to guide the movable mold plate. The movable side guide pin 25 is provided so as to be fitted into the line 24.

  Then, the cassette side movable mold 26 which is a movable mold of the cassette mold 2 is fitted to the movable mold plate 24 and the rail grooves 10b and 10a together with the cassette side fixed mold 13 to the rail (not shown) of the mother mold 1. It is arranged by being inserted while. As will be described in detail later, the cassette-side movable die 26 is provided with a center core 27, a tension bolt 28, and a hook member 29 that are connected by screws.

  At the time of replacement of the cassette type mold 2 including the cassette side fixed mold 13 and the cassette side movable mold 26 with the master mold 1, the injection molding machine (not shown) is in a state in which the mold 1 is closed. The mold is stopped in a state where the mold opening of 0.1 mm to 0.3 mm is applied.

  The cassette mold 2 can be attached and detached by sliding relative to a rail (not shown) provided in the mother mold 1 and rail grooves 10a and 10b formed in the cassette mold 2. Then, the previous cassette mold 2 is pulled out from the mother mold 1 so as to slide.

  Instead, a new cassette-type mold 2 is inserted so as to slide, and the hooking claw 30 of the receiving plate 22 engages with the concave portion of the hooking member 29. By performing such a molding setup change, the molding setup change time can be greatly shortened compared to the conventional mold.

  In this configuration, the process of producing a molded product by injection molding in the cavity 18 via the sprue 14, the runner 16, and the gate 17 is the same as that of a mold having a normal pre-cut mechanism.

  FIG. 2 is a cross-sectional view illustrating a state when the mold is opened after the molded product is molded by the above-described mold according to the first embodiment. The cassette side movable mold 26 shown in FIG. 1 will be described in more detail with reference to this mold opening state diagram.

  In FIG. 2, the mold opening at the parting surface 7 for taking out the resin flow portion solid portion 31 solidified by the sprue, runner and gate of the fixed die 3 and the molded product 32 solidified by the cavity 18 are shown. Although the mold opening at the parting surface 19 for taking out is also shown, these mold opening is the same as the mold for taking out a normal molded product.

  In this example, in the movable mold 4 of the mother mold 1 shown in FIG. 1, if the receiving plate 22 and the movable mold plate 24 are opened on the parting surface 23 for the punching operation, In conjunction with the relative release movement of the plate 22, the center core 27, the tension bolt 28, the sleeve (not shown in FIG. 1), and the hooking member 29, which are integrally formed by screws, are pre-cut by the hooking claws 30. Move in the direction (left of the figure).

  As a result, the center core is removed in advance, the slide insert 33 that has been fixed by the center core 27 until now is opened, and the slide insert starts in the direction of the central axis. However, it escapes from the undercut part 32a of the molded product 32.

  The slide insert 33 is incorporated in the cassette movable mold plate 34 of the cassette side movable mold 26. The cassette type movable mold plate 34 is disposed opposite to the cassette type movable side mounting plate 36 via a cassette type spacer block 35.

  In the space where the cassette type movable mold plate 34 and the cassette type movable side mounting plate 36 are arranged to face each other, the center core 27 and the pull bolt 28 described above are moved forward and backward, and an ejector pin 37 is further arranged. A bush 38 is fixedly attached to the cassette type movable side attachment plate 36.

  FIG. 3 is a cross-sectional view showing only the cassette mold 2 when the mother mold 1 shown in FIG. 1 is closed. 3, the same components as those shown in FIGS. 1 and 2 are denoted by the same reference numerals as those in FIGS. FIG. 3 also shows a cassette type receiving plate 39 not shown in FIGS. 1 and 2.

  As shown in FIG. 3, the slide insert 33 shown in FIG. 2 is held on the close contact surface of the cassette type receiving plate 39 that is in close contact with the cassette type movable mold plate 34. Move the slide.

  Further, the ejector pin 37 is held at the lower end portion (left end portion in FIG. 3) by the upper protruding plate 41 and the lower protruding plate 42. After the punching die opening shown in FIG. 2, the ejector pin 37 moves to the right according to the right movement of the protruding plate upper 41 and the protruding plate lower 42, and the molded product 32 is moved from the cavity 18 to the party. It is pushed out into the mold release space between the cassette-side fixed mold 13 and the cassette-type movable mold plate 34 which are opened on the clamping surface 19.

  As shown in FIG. 3, the above-described hook member 29 is fixed to the rear end portion (the left end portion in FIG. 3) of the tension bolt 28 by a screw 43.

  FIG. 4 is a cross-sectional view of the cassette-side movable mold 26 showing in more detail the configuration of the main part of the leading mechanism including the center core 27, the pull bolt 28, the hook member 29, the bush 38, and the screw 43 described above. 4 also shows a sleeve 44 (not shown in FIGS. 1 to 3) and positioning members (a knock pin 45 and a positioning pin 46).

FIG. 5 is a perspective view showing the structure of the tension bolt 28 of the cassette side movable mold 26 of the cassette type mold 2 shown in FIG.
FIG. 6 is a perspective view showing the configuration of the sleeve 44 of the cassette side movable mold 26 of the cassette mold 2 shown in FIG.

FIG. 7 is a perspective view showing the configuration of the bush 38 of the cassette side movable mold 26 of the cassette mold 2 shown in FIG.
FIG. 8 is a perspective view showing the configuration of the hook member 29 of the cassette side movable mold 26 of the cassette mold 2 shown in FIG.

  The configuration and functions shown in FIG. 4 will be described below with reference to FIGS. As shown in FIG. 5, the tension bolt 28 is composed of a thin rod portion 47 in the distal direction and a thick rod portion 49 that forms a step 48 in the root direction.

  A male screw 51 is cut on the front peripheral surface of the thin rod portion 47, and on the other hand, a plane formed by cutting the peripheral surface axially symmetrically at about 1/2 of the rear end portion of the thick rod portion 49. The part 52 is provided on two surfaces facing each other across the shaft, and a female screw 53 is cut on the rear end surface of the thick bar portion 49.

  The sleeve 44 shown in FIG. 6 includes a pore 54 in the distal direction and a thick hole 55 formed in the rear portion continuously from the pore 54. Prior to the assembly of the lead-out mechanism, the tension bolt 28 is inserted into the pore 54 and the thick hole 55 in advance.

  That is, the tension bolt 28 inserted into the sleeve 44 from the direction of the thick hole 55 is positioned at the mutual position in the axial direction with the step 48 abutting against the step 54 of the sleeve 44 and the step 56 of the thick hole 55. As a result, the tension bolt 28 is surrounded by the sleeve 44 from the connecting tip portion where the male screw 51 is cut to the root portion.

  A long slot 57 is formed in the outer peripheral surface of the sleeve 44 along the axial direction. A deep groove (positioning engagement portion with respect to the center core) 58 penetrating up to the pore 54 is formed at the tip of the long groove hole 57. In a state where the sleeve 44 is externally fitted to the tension bolt 28, the male screw 51 of the tension bolt 28 is screwed into a female screw cut in the hole formed in the rear end surface of the center core 27, and the tension bolt 28 is engaged. Is fixed to the center core 27.

  At this time, the sleeve 44 is pushed into the rear end surface of the center core 27 together with the tension bolt 28 while being rotated around the tension bolt 28, and the knock pin 45 fixed to the rear end surface of the center core 27 is inserted into the deep groove of the sleeve 44. 58, the rotation direction of the sleeve 44 relative to the center core 27 is positioned.

  The bush 38 shown in FIG. 7 includes a main body cylinder portion 59 and a substantially rectangular parallelepiped base 61 that supports the main body cylinder portion 59. R is formed on both longitudinal end faces of the rectangular parallelepiped. The main body cylinder portion 59 has a large hole 62, and the large hole 62 communicates with a slightly larger base hole 63 formed in the base 61 with a step 64.

  Further, a pin engaging hole 65 penetrating the main body cylinder portion 59 is formed at a predetermined position on the peripheral surface of the main body cylinder portion 59 of the bush 38. The pin engagement hole 65 has a large hole on the outer peripheral surface side of the main body cylinder portion 59, a small hole on the inner peripheral surface side, and a female thread.

  In addition, set screw holes 66 are formed in the pedestal holes 63 of the bush 38 at approximately the middle between the both ends in the longitudinal direction and the pedestal holes 63. The set screw hole 66 is a large-diameter hole into which the head of the set screw enters, and a small-diameter screw insertion hole 68 is formed at the tip of the set screw hole 66 through a step 67.

  The rear end portion of the sleeve 44 that is externally fitted to the tension bolt 28 with the tip fixed to the center core 27 is inserted into the large hole 62 of the main body cylindrical portion 59 of the bush 38.

  The positioning pin 46 inserted into the pin engaging hole 65 of the bush 38 is screwed into the female screw cut in the small hole on the inner peripheral surface side of the bush 38, and the head of the positioning pin 46 is on the outer peripheral surface side. The screw is screwed in until it is hidden in the large-diameter hole, and the tip is slidably fitted into the long slot 57 of the sleeve 44.

  Thereby, the sleeve 44 is positioned in the rotational direction with respect to the bush 38 in a free state in the axial direction. As a result, the center core 27 is also positioned in the rotational direction in a free state in the axial direction with respect to the bush 38 via the knock pin 45, the sleeve 44, the long slot 57, and the positioning pin 46.

  In this state, the bush 38 is inserted into the bush mounting hole of the cassette type movable side mounting plate 36, and the set screw inserted through the screw insertion hole 68 of the base hole 63 is hidden in the set screw hole 66. And the bush 38 is fixed in the bush mounting hole of the cassette movable side mounting plate 36. In this state, the lower surface of the bush 38 and the bush mounting surface of the cassette type movable side mounting plate 36 form a series of flat surfaces.

  The hook member 29 shown in FIG. 8 has a front flange 71 and a rear flange 72 at both front and rear ends of a cylindrical body portion 69, and the holes of the flange portions are stepped 73 or stepped than the holes of the body portion 69, respectively. It is formed in a hole having a large diameter by 74.

  The front flange 71 of the hook member 29 is inserted so as to be hidden in the base hole 63 of the bush 38. The rear end of the sleeve 44 fitted to the tension bolt 28 together with the tension bolt 28 is inserted into the hole of the front flange 71 until it contacts the step 73 of the hole of the front flange 71.

  In this state, the internal thread formed on the rear end of the tension bolt 28 until the tip screw portion of the screw 43 inserted from the hole of the rear flange 72 of the hook member 29 is hidden in the hole of the rear flange 72. 53. Thereby, the pull bolt 28 is fixed to the hook member 29, and the assembly of the cassette side movable mold 26 shown in FIG. 4 is completed.

  Then, by assembling the cassette side fixed mold 13 to the cassette side movable mold 26, the assembly of the cassette type mold 2 shown in FIG. 3 is completed. As described above, when the cassette mold 2 is inserted so that the rail grooves 10a and 10b are fitted to the rails of the mother mold 1 and the cassette mold 2 is slid into the mother mold 1, it is hooked. The hooking claw 30 of the receiving plate 22 is engaged with the body 69 between the front flange 71 and the rear flange 72 of the member 29, and the attachment of the cassette type mold 2 to the mother die 1 is completed.

  Thus, in this embodiment, the portion connecting the cassette core movable die 26 with the center core 27 of the cassette side movable die 26 leading mechanism is the tension bolt 28, sleeve 44, knock pin 45, bush 38, positioning pin. 46, a hook member 29, a screw 43, and a plurality of members.

  The cassette-type movable mold plate 34 and the slide insert 33 that form the cavity 18 and the center core 27 that fixes or opens the slide insert 33 are members that are manufactured with extremely high precision. The precision may be damaged.

  Therefore, until the assembly of the pre-punching mechanism is completed, in order to prevent the mold forming the cavity 18 from being damaged, a plurality of members with loose play are sequentially assembled and adjusted while taking the pre-punching. Complete the assembly of the mechanism.

  As a result, it was possible to create a cassette type mold having a tipping mechanism that can be detachably exchanged with respect to the mother mold.

  INDUSTRIAL APPLICABILITY The present invention can be used for an injection mold having a cassette type punching mechanism that is detachably attached to a mother mold.

1 Master mold 2 Cassette mold 3 Fixed mold 4 Movable mold 5 Fixed mold mounting plate 6 Stripper plate 7 Parting surface 8 Fixed mold plate 9 Fixed guide pin 10a, 10b Rail groove 11 Locating ring 12 Sprue bush 13 Fixed on the cassette side Mold 14 Sprue 15 Cylindrical mold member 16 Runner 17 Gate 18 Cavity 19 Parting surface 21 Movable mold mounting plate 22 Receiving plate 23 Parting surface 24 Movable mold plate 25 Movable side guide pin 26 Cassette side movable mold 27 Center core 28 Pull Bolt 29 Hooking member 30 Hook claw 31 Resin flow part solid part 32 Molded product 32a Undercut part 33 Slide insert 33a Undercut corresponding part 34 Cassette type movable mold plate 35 Cassette type spacer block 36 Cassette type movable side mounting plate 37 D Ejector pin 38 bushing 39 cassette type receiving plate 41 projecting plate upper 42 projecting plate lower 43 screw 44 sleeve 45 knock pin 46 positioning pin 47 thin rod portion 48 step 49 thick rod portion 51 male screw 52 flat portion 53 female screw 54 fine hole 55 thick hole 56 step 57 Long groove hole 58 Deep groove 59 Body cylinder part 61 Base 62 Large hole 63 Base hole 64 Step 65 Pin engagement hole 66 Set screw hole 67 Step 68 Screw insertion hole 69 Body 71 Front flange 72 Rear flange 73, 74 Step

Claims (2)

In a mold for injection molding in which a movable mold part is pre-cut, it is formed into a cassette-type pre-cut mold,
A tension bolt that is connected at one end to the mold part to be pre-punched,
A sleeve surrounding the circumferential surface of the tension bolt;
A hook member connected to the other end of the pull bolt by a screw;
A bush fixed to the movable mounting plate;
A pin for positioning the bush and the sleeve;
A cassette type die-cut mold for injection molding, characterized by comprising: In the cassette type die-cutting injection mold that is detachably attached to the mother mold,
A tension bolt whose tip is connected to the center core corresponding to the mold part that is the target of the cassette-type movable mold,
Surrounding from the connecting tip portion of the tension bolt to the root portion, a positioning engagement portion with respect to the center core, a fixing pin for mutually fixing the tension bolt, and a long slot formed in the outer peripheral surface along the axial direction, A sleeve having
A cylindrical body having a front flange in contact with the root end face of the sleeve and a rear flange formed at an end opposite to the end with the front flange, and inserted through a hole at an end of the rear flange The base plate of the mother die is engaged with the engaging portion of the base plate of the base plate by engaging the body portion between the front flange and the rear flange with the base end portion of the tension bolt by the screw A hook member coupled to the
A positioning pin for contacting the end face of the front flange of the hooking member, surrounding the sleeve, and slidably fitted in the slotted hole of the sleeve to position the rotation direction of the sleeve; A bush fixed to the movable mounting plate on the cassette side to be engaged with the template,
Have
The pull bolt is connected to the sleeve in the moving direction of the receiving plate of the mother die via the hook member in accordance with a mold opening of a leading-out operation performed by the receiving plate of the mother die and the movable die plate of the mother die. Move along with the center core,
A cassette type die-cutting mold for injection molding.