WO2017006990A1 - Procédé de coupe de grille et dispositif de coupe de grille - Google Patents

Procédé de coupe de grille et dispositif de coupe de grille Download PDF

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Publication number
WO2017006990A1
WO2017006990A1 PCT/JP2016/070122 JP2016070122W WO2017006990A1 WO 2017006990 A1 WO2017006990 A1 WO 2017006990A1 JP 2016070122 W JP2016070122 W JP 2016070122W WO 2017006990 A1 WO2017006990 A1 WO 2017006990A1
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WIPO (PCT)
Prior art keywords
gate
molded product
useful
holding
holding table
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PCT/JP2016/070122
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English (en)
Japanese (ja)
Inventor
山岸　裕幸
玲郎 望月
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株式会社フジクラ
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Publication of WO2017006990A1 publication Critical patent/WO2017006990A1/fr

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/17—Component parts, details or accessories; Auxiliary operations
    • B29C45/38—Cutting-off equipment for sprues or ingates

Definitions

  • the present invention relates to a gate cut method and a gate cut device.
  • a gate cut method for the designated countries that are allowed to be incorporated by reference, the contents described in Japanese Patent Application No. 2015-137839 filed in Japan on July 9, 2015 are incorporated herein by reference. Part of the description.
  • Gate cut provided with a guide formed with an inclined surface that gradually bends the connection part between the useful part and the unnecessary part by advancing in a state where it contacts the molded product as the useful part connected to the branch part end of the unnecessary part
  • Patent Document 1 An apparatus is known (see, for example, Patent Document 1).
  • one of the tensile force and the compressive force acts on the surface of the connecting portion that contacts the inclined surface, and the other of the tensile force and the compressive force acts on the opposite surface. For this reason, there is a problem that only one of the tensile force and the compressive force acts on the surface of the connecting portion, and there is a possibility that the cutting failure of the connecting portion such as burrs and whiskers may occur.
  • the problem to be solved by the present invention is to provide a gate cut method and a gate cut device capable of suppressing the occurrence of cutting defects.
  • the gate cutting method includes a first step of preparing a molded product having a useful part and an unnecessary part connected to the useful part via a gate having a cut, and the molded product. And a third step of separating the useful part from the molded product, wherein the third step includes the first contact member from the first side. After pressing against the useful part and bending the gate from the first side, and bending the gate from the first side, a second contact member from the second side is applied to the useful part. And pressing and bending the gate from the second side to cut the gate starting from the notch, wherein the first side is the side of the gate where the notch opens. Yes, the second side is the opposite side of the first side.
  • the second abutting member may be a brush having a plurality of linear members that abut on the useful part on the distal end side and are assembled on the proximal end side.
  • the ends of the plurality of linear members may be arranged on a substantially straight line along the longitudinal direction of the useful portion in plan view.
  • the length of the linear member may become longer as it approaches the gate.
  • the unnecessary part is connected to the useful part via the gate at the other end, the large diameter part connected to one end of the sprue, the large diameter part connected to the one end of the sprue, and the other end.
  • the runner has a pair of first inclined surfaces that are inclined so as to approach each other toward the first side in a short-side cross section of the runner, and the holding
  • the base is connected to a negative pressure generating device, holds the molded product by suction from the side where the notch is opened, and fits to hold the runner in the suction holding member that can be expanded and contracted along the extending direction.
  • the suction holding member while holding it, and sinking the molded product toward the holding table.
  • the large-diameter portion has a hemispherical suction surface on the first side, and the second step is performed in the state where the suction port is in close contact with the suction surface.
  • the method may further include sucking negative pressure with a pressure generator.
  • a gate cut device includes a holding base for holding a molded product having a useful part, and an unnecessary part connected to the useful part via a gate having a cut, and a first side.
  • a first moving mechanism that moves one of the holding table and the other of the first abutting member relative to each other; and one of the holding table or the second abutting member of the holding table.
  • a second moving mechanism that moves relative to the other of the second abutting members, and the first abutting member is moved relative to the holding table by the first moving mechanism.
  • the first abutting member is moved relative to the second side from the first side and moved from the first side to the second side.
  • the second moving member is moved relative to the holding base from the second side to the first side by the second moving mechanism, and the first side is In the gate, the notch is an opening side, and the second side is an opposite side of the first side.
  • the second contact member may be a brush having a plurality of linear members that are in contact with the useful portion on the distal end side and are assembled on the proximal end side.
  • each of the tips of the plurality of linear members may be arranged on a substantially straight line along the longitudinal direction of the useful portion.
  • the length of the linear member may become longer as it approaches the gate.
  • the holding table is connected to a negative pressure generator, holds the molded product by suction from the first side, and is fitted with a suction holding member that can be expanded and contracted in the extending direction.
  • the fitting groove has a pair of second inclined surfaces that incline so as to approach each other toward the first side in the short-side cross section. May be.
  • the unnecessary portion includes a sprue and a large-diameter portion connected to one end of the sprue, and the large-diameter portion has a hemispherical suction surface on the first side.
  • the molded product may be sucked and held by bringing the suction port of the suction holding member into close contact with the suction surface.
  • both tensile force and compressive force are applied to one surface of the gate.
  • both tensile force and compressive force can be applied to the other surface.
  • FIG. 1 is a perspective view showing a molded product according to an embodiment of the present invention.
  • 2A is a side view of the molded product shown in FIG. 1
  • FIG. 2B is a front view of the molded product shown in FIG.
  • FIG. 3 is a perspective view showing a gate cut device according to an embodiment of the present invention.
  • FIG. 4 is a perspective view showing a holding table according to an embodiment of the present invention.
  • FIG. 5 is a cross-sectional view taken along line VV in FIG. 6 is a cross-sectional view taken along line VI-VI in FIG.
  • FIG. 7 is a perspective view showing a cutting part according to an embodiment of the present invention.
  • FIG. 8 is a partially enlarged plan view of a cutting part according to an embodiment of the present invention.
  • FIG. 9 is a plan view of a brush according to an embodiment of the present invention.
  • FIG. 10 is a process diagram showing a gate cut method according to an embodiment of the present invention.
  • FIG. 11A and FIG. 11B are views (No. 1) for explaining the holding step according to the embodiment of the present invention.
  • FIGS. 12A and 12B are views (No. 2) for explaining the holding step according to the embodiment of the present invention.
  • FIG. 13 is a diagram (No. 1) for explaining a separation step according to an embodiment of the present invention.
  • FIGS. 14A to 14C are views (No. 2) for explaining the separation step according to the embodiment of the present invention.
  • FIG. 15 is a diagram (No. 3) for explaining the separation step according to the embodiment of the present invention.
  • FIG. 16 is a diagram (No.
  • FIGS. 17A to 17D are views (No. 5) for explaining the separation step according to the embodiment of the present invention.
  • FIG. 18 is a plan view of FIG. 17B as viewed from above.
  • FIG. 19 is a plan view showing a modification of the second contact member according to the embodiment of the present invention.
  • the gate cut device 1 of the present embodiment is a device that acquires a product from a molded product M that has been subjected to injection molding by the cold runner method.
  • the cold runner method at the end of the injection molding, the flow path portion of the molten resin material in the injection mold (not shown) is taken out together with the product. Therefore, in this embodiment, the product and the flow path using the gate cut device 1 are used. Separate the parts.
  • FIG. 1 is a perspective view showing a molded product according to an embodiment of the present invention
  • FIG. 2A is a side view of the molded product shown in FIG. 1
  • FIG. 2B is a front view of the molded product shown in FIG. FIG.
  • the molded product M is a multi-spot molded product that molds a plurality of products (four in this embodiment) molded at once using an injection mold, and is a thermoplastic resin. And a resin material such as a thermosetting resin.
  • the “molded product M” in the present embodiment corresponds to an example of the “molded product” in the present invention.
  • This molded product M has a useful part P that becomes a product, an unnecessary part U that is a part excluding the useful part P, and a gate G that interconnects the useful part P and the unnecessary part U. .
  • the useful part P of the present embodiment has a rectangular outer shape, but the shape of the useful part P is not particularly limited.
  • the “useful part P” in the present embodiment corresponds to an example of the “useful part” in the present invention
  • the “unnecessary part U” in the present embodiment corresponds to an example of the “unnecessary part” in the present invention.
  • “Gate G” corresponds to an example of “gate” in the present invention.
  • the unnecessary portion U has a sprue S, a large diameter portion W, and a runner R.
  • a molten resin material injected from an injection device flows into a cavity for molding the useful part P through a flow path such as a sprue bush or runner molding groove in an injection mold.
  • the unnecessary part U is a part corresponding to this flow path.
  • the sprue S is located substantially at the center of the entire molded product M in plan view.
  • the sprue S extends along the vertical direction of FIG. 2A, and is formed so as to gradually increase in diameter as it goes downward.
  • the reduced diameter portion (that is, the upper end portion) of the sprue S corresponds to a connection opening to which an injection device in the injection mold is connected.
  • the “sprue S” in the present embodiment corresponds to an example of “sprue” in the present invention.
  • the large diameter portion W is connected to the large diameter side (that is, the lower end side) of the sprue S. As shown in FIG. 2A, the large diameter portion W has a diameter larger than the outer diameter on the large diameter side of the sprue S, and has a hemispherical shape (cut spherical shape).
  • the large-diameter portion W has a suction surface A formed of a hemispherical curved surface on the lower side (that is, the side opposite to the side on which the sprue S extends).
  • the outer shape of the large-diameter portion is not particularly limited to the above, and may have a semi-cylindrical shape.
  • a slag well C disposed coaxially with the sprue S is formed so as to protrude downward from the adsorption surface A.
  • the slag well C has a function of collecting a cooled molten resin material (cold slag) generated in the initial stage of injection molding.
  • a sprue lock pin Z pin
  • the sprue lock pin By forming the sprue lock pin, when the injection molding die composed of the fixed die and the movable die is opened, the molded product M can be accompanied with the movable die.
  • the “large diameter portion W” in the present embodiment corresponds to an example of the “large diameter portion” in the present invention
  • the “adsorption surface A” in the present embodiment corresponds to an example of the “adsorption surface” in the present invention.
  • a plurality of (two in this embodiment) runners R extend radially from the large diameter portion W along the radial direction of the large diameter portion W.
  • the tip of each runner R is divided into a T-shape on a plane orthogonal to the extending direction of the sprue S.
  • the runner R of the present embodiment mutually increases as it goes downward in the short-side cross-sectional view of the runner R from the viewpoint of improving mold release properties in the resin molding die. It has a pair of inclined surfaces R1a and R1b that are inclined so as to approach each other.
  • the runner R has a bottom surface R1c continuously connected to the pair of inclined surfaces R1a and R1b.
  • tilt angle with respect to the extension direction of the sprue S of inclined surface R1a, R1b is 1 degree or more and 10 degrees or less.
  • the bottom surface R1c is a substantially flat surface.
  • the bottom surface R1c may be a curved surface from the viewpoint of further improving the releasability in the resin molding die.
  • the “runner R” in the present embodiment corresponds to an example of the “runner” in the present invention
  • the “inclined surfaces R1a and R1b” in the present embodiment corresponds to an example of “a pair of first inclined surfaces” in the present invention. .
  • a gate G interposed between the runner R and the useful part P is formed at the tip of the runner R.
  • the gate G functions as an inlet to the cavity for molding the useful part P in the injection mold, and is smaller than the runner R from the viewpoint of preventing backflow and easy separation of the useful part P. It has a cross-sectional area.
  • the gate G of this embodiment is connected to the runner R so that one end is substantially parallel to the extending direction of the tip of the runner R, and the other end is connected to one end of the useful part P.
  • the useful portion P extends toward the side away from the sprue S along the direction orthogonal to the extending direction of the tip of the runner R on the same plane as the runner R.
  • a cut NT (notch) is formed.
  • the cut NT is formed in a half-cut shape (half-cut shape) from one surface of the gate G, and has an opening end OE that opens on the surface of the lower gate G, a closed end CE that closes on the upper side, have.
  • the distance between the open end OE and the closed end CE in the extending direction of the sprue S is the cut amount of the cut NT.
  • a remaining portion G2 that connects the useful portion P and the runner R is formed in a portion where the cut NT has not reached (that is, a portion between the surface of the upper gate G and the cut NT). Yes.
  • the shape of the cut NT of this embodiment is not particularly limited, and may be formed in a V shape or a rectangular shape.
  • the gate G can be easily and reliably broken at a predetermined position from this, so that the useful part P and the unnecessary part U can be separated. It becomes easy.
  • “Incision NT” in the present embodiment corresponds to an example of “incision” in the present invention.
  • “Open end OE side” in the present embodiment corresponds to an example of “first side” in the present invention.
  • the closed end CE side corresponds to an example of the “second side” in the present invention.
  • FIG. 3 is a perspective view showing a gate cutting device according to an embodiment of the present invention
  • FIGS. 4 to 6 are views showing a holding table according to an embodiment of the present invention
  • FIG. 9 is a top view of the brush which concerns on one Embodiment of this invention.
  • the gate cut device 1 includes a holding table 10, a cutting unit 20, a moving mechanism 30, a discharge chute 40, a negative pressure generator 50, and a controller 60.
  • the “gate cut device 1” in the present embodiment corresponds to an example of the “gate cut device” in the present invention
  • the “holding table 10” in the present embodiment corresponds to an example of the “holding table” in the present invention
  • the “negative pressure generator 50” in the embodiment corresponds to an example of the “negative pressure generator” in the present invention.
  • the holding table 10 is used to hold the molded product M, and includes a main body 11, a support 12, a bellows tube 13, and a connection arm 14, as shown in FIG.
  • the main body 11 is formed with a recess 112 and a conduit 113.
  • the recess 112 is located substantially at the center of the main body 11 and extends along the Z direction.
  • pipe 113 is formed in the inside of the main-body part 11, The one end opens to the bottom face of the recessed part 112, and the other end is connected with the negative pressure generator 50 via the connection member.
  • support portions 12 that support the molded product M are provided on both side ends of the main body portion 11 in the Y direction so as to protrude in the + Z direction.
  • a fitting groove 121 that opens upward and has a shape corresponding to the tip of the runner R is formed at the upper end of the support portion 12.
  • the fitting groove 121 includes a first fitting groove 122 extending in the X direction and a second fitting groove 123 extending in the Y direction.
  • the first and second fitting grooves 122 and 123 intersect each other in the vicinity of their respective approximate centers, and a cross-shaped fitting groove 121 as a whole is formed at the upper end of the support portion 12.
  • first fitting groove 122 In the first fitting groove 122, as shown in FIGS. 4 and 6, a pair of inclined surfaces 122a and 122b and a bottom surface 122c are formed.
  • the pair of inclined surfaces 122a and 122b are inclined so as to approach each other toward the ⁇ Z direction, and are continuously connected to the bottom surface 122c.
  • a pair of inclined surfaces 123 a and 123 b and a bottom surface 123 c are also formed in the second fitting groove 123.
  • the pair of inclined surfaces 123a and 123b are inclined so as to approach each other toward the ⁇ Z direction, and are continuously connected to the bottom surface 123c.
  • the pair of inclined surfaces 122a and 122b and the pair of inclined surfaces 123a and 123b correspond to the pair of inclined surfaces R1a and R1b of the runner R, and the bottom surfaces 122c and 123c correspond to the bottom surface R1c of the runner R ( (Refer FIG.12 (b)).
  • the first and second fitting grooves 122 and 123 have a slight difference in shape, the basic structure is the same. Therefore, the second fitting groove 123 is shown in FIG.
  • the illustration of the fitting groove 122 is omitted by attaching the reference numerals in parentheses.
  • the fitting groove 121 of this embodiment is for accommodating and holding the tip of the runner R. It is useful to insert the runner R into the fitting groove 121 and place the molded product M on the holding table 10.
  • the part P protrudes from the front end side of the fitting groove 121.
  • the “support portion 12” in the present embodiment corresponds to an example of the “support portion” in the present invention
  • the “fitting groove 121” in the present embodiment corresponds to an example of the “fitting groove” in the present invention.
  • “Inclined surfaces 122a, 122b” and “inclined surfaces 123a, 123b” in the embodiment correspond to an example of “a pair of second inclined surfaces” in the present invention.
  • a bellows tube 13 is accommodated in a recess 112 formed in the main body 11.
  • the bellows tube 13 has a bellows portion 131 capable of contracting in the Z direction in which a cavity capable of accommodating the slag well C is formed.
  • a suction port 132 that opens upward is formed at one end of the bellows portion 131, and a connection port 133 that opens downward is formed at the other end.
  • the overall length of the bellows tube 13 is longer than the depth of the recess 112, and the suction port 132 protrudes in the + Z direction from the upper end (that is, the upper surface 111) of the recess 112.
  • the bellows portion 131 can be expanded and contracted in the Z direction according to the load. However, in the loaded state, the suction port 132 may enter the recessed portion 112 and keep the state protruding in the + Z direction. Also good.
  • the suction surface A of the large-diameter portion W of the molded product M can contact the suction port 132.
  • connection port 133 faces the bottom surface of the recess 112, and a conduit 113 that opens to the bottom surface of the recess 112 communicates with the internal space of the bellows pipe 13 through the connection port 133.
  • the “bellows tube 13” in the present embodiment corresponds to an example of an “adsorption holding member” in the present invention
  • the “adsorption port 132” in the present embodiment corresponds to an example of an “adsorption port” in the present invention.
  • the connecting arm 14 supports the main body 11 in a cantilevered manner on the lower end side. Further, an insertion hole 141 is formed on the upper end side of the connection arm 14 through which a rotary shaft 332 (described later) that penetrates the connection arm 14 along the Y direction can be inserted. A key groove is formed in the insertion hole 141 and the rotation shaft 332, and the holding base 10 is connected to the rotation shaft 332 by inserting the rotation shaft 332 into the insertion hole 141 in a state where the key is engaged with the key groove. Is done. Accordingly, when the rotation shaft 332 is driven to rotate, the holding base 10 can be driven to rotate about the rotation shaft 332.
  • the cutting unit 20 includes two separation plates 21a and 21b extending in a substantially parallel manner along the X direction supported in a cantilever manner on the apparatus frame 70, and the separation plates 21a and 21b. And two brushes 27 attached to each of them (four in total).
  • the separation plate 21a is positioned on the proximal end side of the separation plate 21a, the first protrusion 22a located substantially at the distal end of the separation plate 21a, the second protrusion 23a arranged spaced apart from the first protrusion, and the separation plate 21a. And a wide portion 24a.
  • the separation plate 21b also includes first and second protrusions 22b and 23b and a wide portion 24b.
  • “separation plates 21a and 21b” are collectively referred to as “separation plates 21”
  • first protrusions 22a and 22b are collectively referred to as “first protrusions 22”
  • second protrusions 23a, 23b are collectively referred to as “second protrusions 23”
  • wide portions 24a, 24b are collectively referred to as “wide portions 24”.
  • the “first and second protrusions 22 and 23” in the present embodiment correspond to an example of the “first contact member” in the present invention.
  • the first and second protrusions 22 and 23 are protrusions having a rectangular outer shape, and are formed integrally with the separation plate 21. In the present embodiment, a total of two first protrusions 22 and two second protrusions 23 are provided on the separation plate 21, and the four protrusions 22 and 23 are formed. It corresponds to the four useful parts P of the product M.
  • the first and second protrusions 22a and 23a formed on the separation plate 21a are formed to protrude in the + Y direction from the side surface of the separation plate 21a toward the separation plate 21b side.
  • the first and second protrusions 22b and 23b are formed so as to protrude in the ⁇ Y direction from the side surface of the separation plate 21b toward the separation plate 21a.
  • the first protrusions 22a and 22b correspond to be located on the same straight line in the extending direction (that is, the Y direction), but they are arranged apart from each other, and the first protrusion 22a and 22b are in between.
  • the slit 291 is formed.
  • the second protrusions 23a and 23b also correspond to be located on the same straight line in the extending direction, but they are arranged apart from each other, and the second slit 292 is interposed therebetween. Is forming.
  • the upper surface 221 of the first protrusion 22 is formed as a substantially flat surface
  • the upper surface 231 of the second protrusion 23 is also formed as a substantially flat surface.
  • the upper surfaces 221 and 231 are not particularly limited to this, and may be inclined surfaces or curved surfaces.
  • the upper surfaces 221 and 231 of the first and second protrusions 22 and 23 are located on the lower side (opening end OE side) of the useful part P of the molded product M held by the holding table 10. It can contact the surface.
  • the wide portion 24 has a width wider than the portion of the separation plate 21 that supports the first and second protrusions 22 and 23, and is approximately the same as the first and second protrusions 22 and 23 in the Y direction. It protrudes.
  • Bolt holes are formed in the wide portion 24, and the separation plate 21 is fixed to the device frame 70 by screwing bolts into the device frame 70 via the wide portion 24.
  • first recess 25 that is relatively recessed compared to the first and second protrusions 22 and 23. 25a and 25b are collectively called).
  • second recess 26 that is relatively recessed compared to the second protrusion 23 and the wide portion 24 between the second protrusion 23 and the wide portion 24 in the X direction. 26a and 26b are collectively called).
  • the first and second recesses 25 and 26 are closed by the side surface of the separation plate 21 on the base end side of the first and second protrusions 22 and 23 in a plan view, and the first and second protrusions 22 and 23 is open on the tip side.
  • first recesses 25a and 25b are opposed to each other, thereby forming a first space 281 between the separation plates 21a and 21b.
  • second recesses 26a and 26b are also opposed to each other, whereby a second space 282 is formed between the separation plates 21a and 21b.
  • the first and second spaces 281 and 282 are spaces having a size that can accommodate the holding table 10 in a plan view, but the first space 281 and the second space 281 in the X direction are larger than the length of the first space 281 in the X direction.
  • the length of the second space 282 is slightly increased.
  • the first and second spaces 281 and 282 communicate with each other through the second slit 292.
  • two brushes 27 are provided on each of the separation plates 21 a and 21 b (four in total), and the four brushes 27 are four useful parts of the molded product M. It corresponds to P.
  • the “brush 27” in the present embodiment corresponds to an example of the “second contact member” and the “brush” in the present invention.
  • the brush 27 includes a plurality of linear members 271 and a binding member 272 that collects the plurality of linear members 271.
  • the linear member 271 is made of a material having electrostatic resistance (conductive) that can be elastically deformed. Specifically, polyethylene terephthalate (PET), nylon, or the like is used.
  • PET polyethylene terephthalate
  • nylon nylon, or the like is used.
  • a material which comprises the linear member 271 you may contain carbon in the above-mentioned resin material. Thereby, since static resistance is provided to the linear member 271, it can suppress that the useful part P which was cut
  • the linear member 271 is in contact with the useful portion P on the distal end 271a side, and is assembled by a binding member 272 on the proximal end 271b side.
  • the tips of the brushes 27 (that is, the tips 271a of the plurality of linear members 271) are aligned so as to be substantially straight and oblique with respect to the extending direction of the brushes 27.
  • the tip of the brush 27 that is obliquely cut out extends along the Y direction (see FIGS. 7 and 8).
  • the “linear member 271” in the present embodiment corresponds to an example of the “linear member” in the present invention.
  • the binding member 272 has an annular portion 273 formed side by side in the extending direction of the linear member 271.
  • the plurality of linear members 271 can be held in an assembled state by caulking the annular portion 273 in a state where the plurality of linear members 271 are accommodated in the annular portion 273.
  • Bolt holes are formed in the binding member 272, and the brushes 27 are fixed to the separation plate 21 by screwing the bolts to the separation plate 21 through the bolt holes.
  • the brush 27 attached to the separation plate 21a is arranged so that the tip thereof faces the separation plate 21b side.
  • the brush 27 attached to the separation plate 21b is arranged so that the tip thereof faces the separation plate 21a side.
  • the first brush 27a is fixed near the base end of the second protrusion 23a so that its extending direction is inclined to the + X direction side with respect to the Y direction.
  • the second brush 27b is fixed near the base end of the wide portion 24 so that the extending direction is inclined to the ⁇ X direction side with respect to the Y direction. That is, the first and second brushes 27a and 27b are arranged so that the tips of the first and second brushes 27a approach each other as the tips of the first and second brushes 27a and 27b move away from the separation plate 21a. As a result, each brush 27 is arranged so that the tip thereof faces the second space 282 in plan view.
  • the length L1 of the linear member 271 located on the side away from the separation plate 21a in the linear member 271 is separated. It is longer than the length L2 of the linear member 271 located on the side approaching the plate 21a (L1> L2).
  • the tip of the brush 27 is an abbreviation of the useful portion P (indicated by a broken line in FIG. 8). It is arranged to be able to contact the whole.
  • the moving mechanism 30 has a function of moving the holding base 10 with respect to the cutting unit 20, and includes a horizontal moving mechanism 31, a vertical moving mechanism 32, and a rotational moving mechanism 33.
  • a traveling body 312 is placed on a rail 311 extending in the X direction so as to be able to reciprocate at a constant speed.
  • a traveling body 322 that moves up and down at a constant speed along the Z direction is supported by a lifting frame 321 that extends in the Z direction.
  • the rotating shaft 332 is rotatably supported by the arm 331 provided in the traveling body 322 via the bearing.
  • the driving source of the horizontal moving mechanism 31 and the vertical moving mechanism 32 is not particularly limited, but a belt driving mechanism (not shown) connected to an electric motor via a belt may be used, or the electric motor is connected.
  • a feed screw drive mechanism in which a part of the feed screw is engaged may be used.
  • the drive source of the rotational movement mechanism 33 is not particularly limited, but an electric motor coupled to the rotation shaft 332 may be used.
  • the holding stand 10 is moved with respect to the cutting part 20, if the cutting part 20 and the holding stand 10 can move relatively at a predetermined
  • only the cutting unit 20 may be moved with respect to the holding table 10, or both the cutting unit 20 and the holding table 10 may be moved.
  • the “vertical movement mechanism 32” in the present embodiment corresponds to an example of “first and second movement mechanisms” in the present invention.
  • the discharge chute 40 has a function of guiding the unnecessary part U to an unnecessary part collection box (not shown) for collecting the unnecessary part U after the separation of the useful part P and the unnecessary part U in the molded product M is completed.
  • the discharge chute 40 is disposed below the holding table 10 waiting at the retracted position.
  • the control device 60 is a microcomputer including a CPU, a ROM, a RAM, an A / D converter, an input / output interface, and the like.
  • the control device 60 outputs a command for driving the moving mechanism 30 and the negative pressure generating device 50 to the driving source of the moving mechanism 30 and the negative pressure generating device 50 so that the gate cut method described below is executed. .
  • FIG. 10 is a process diagram showing a gate cutting method according to an embodiment of the present invention.
  • FIGS. 11A, 11B, 12A, and 12B are diagrams illustrating an embodiment of the present invention.
  • FIG. 13, FIG. 14 (a) to FIG. 14 (d), FIG. 15, FIG. 16, and FIG. 17 (a) to FIG. 17 (d) are diagrams for explaining the holding process according to the embodiment.
  • FIG. 18 is a plan view of FIG. 17B viewed from above, illustrating a separation process according to an embodiment.
  • the gate cutting method of the present embodiment includes a preparation step S1, a molded product confirmation step S2, a holding step S3, a holding confirmation step S4, a separation step S5, and a separation confirmation step S6. It has.
  • the “preparation step S1” in the present embodiment corresponds to an example of the “first step” in the present invention
  • the “holding step S3” in the present embodiment corresponds to an example of the “second step” in the present invention
  • the “separation step S5” in the present embodiment corresponds to an example of the “third step” in the present invention.
  • a molded product M is prepared.
  • the molded product confirmation step S2 it is confirmed whether or not the prepared molded product M includes the useful part P and the unnecessary part U. The presence or absence of the useful part P and the unnecessary part U is confirmed using a camera or the like.
  • the process proceeds to the holding step S3. If at least one of the useful part P and the unnecessary part U is missing, the molded product M is defective. Returning to the preparation step S1, the preparation step S1 to the molded product confirmation step S2 are repeated.
  • the prepared molded product M is placed on the holding table 10 so that the opening end OE side of the cut NT faces the upper surface 111 of the holding table 10. That is, the molded product M is held on the holding table 10 in such a posture that the sprue S protrudes in the + Z direction.
  • the placement of the molded product M on the holding table 10 is performed manually by a robot or an operator.
  • the molded product M is placed on the holding table 10 in the above posture, the suction surface A of the large diameter portion W is brought into contact with the suction port 132 of the bellows tube 13, and the runner R is inserted into the fitting groove 121 of the support portion 12. (See FIG. 11A and FIG. 11B).
  • the second fitting groove 123 is illustrated as in FIG. 6, and the first fitting groove 122 is denoted by the corresponding reference numerals in parentheses and is not shown.
  • the negative pressure generating device 50 is operated to perform negative pressure suction.
  • the suction surface 132 has a shape suitable for suction, so that the suction port 132 is in close contact with the suction surface A.
  • the inside of the bellows tube 13 is sealed, and the internal space of the bellows tube 13 becomes negative pressure.
  • the negative pressure generated in the internal space of the bellows tube 13 acts to contract the bellows portion 131 in the ⁇ Z direction.
  • the negative pressure generated in the internal space of the bellows tube 13 contracts the bellows portion 131 while the molded product M is adsorbed and held in the bellows tube 13 (specifically, the suction port 132).
  • the molded product M descends so as to sink in the ⁇ Z direction.
  • the holding confirmation step S4 it is confirmed whether or not the molded product M is held on the holding table 10.
  • the process proceeds to the separation step S5. If the molded product M is not held on the holding table 10, the process returns to the holding step S3, and the holding step S3 to holding confirmation. Repeat step S4.
  • the horizontal movement mechanism 31 is driven to move the holding table 10 waiting at the retracted position above the first space 281 of the cutting unit 20.
  • the vertical movement mechanism 32 is driven to lower the holding table 10 (FIG. 14A).
  • the separation plate 21 is moved relatively from the open end OE side to the closed end CE side with respect to the holding table 10 by the vertical movement mechanism 32.
  • the useful portion P is formed on the upper surfaces 221 and 231 of the first and second protrusions 22 and 23.
  • the surface on the lower side (opening end OE side) is pressed (FIG. 14B), and the gate G (specifically, the remaining portion G2) is deformed (plastically deformed) so as to be bent starting from the notch NT ( FIG. 14 (c)).
  • a tensile force acts on the surface of the gate G on the lower side (opening end OE side), and a compressive force acts on the surface of the gate G on the upper side (closed end CE side).
  • the gate G specifically, the remaining portion G2
  • the lower surface is elongated and becomes brittle
  • the upper surface is compressed and becomes brittle.
  • the tensile force and compressive force acting on the surface of the gate G can be controlled by adjusting the positional relationship between the first and second protrusions 22 and 23 and the useful portion P. And the position of the blade edge of the second protrusion 23 is located on the useful part P side of the boundary between the part accompanying the useful part P side and the part accompanying the unnecessary part U side in the gate G. Preferably, it is more preferable to substantially coincide with the boundary between the useful part P and the gate G (that is, the end of the cut NT on the useful part P side).
  • the separation plate 21 is moved from the open end OE side to the closed end CE side, the gate G is bent from the open end OE side, and then the horizontal moving mechanism 31 is driven as shown in FIG.
  • the holding table 10 is moved from below the first space 281 to below the second space 282.
  • the connection arm 14 of the holding table 10 enters the first space 281, but moves through the first slit 291, so that the holding table 10 and the cutting unit 20 do not come into contact with each other.
  • the vertical movement mechanism 32 is driven to raise the holding table 10.
  • the brush 27 is moved relative to the holding base 10 from the closed end CE side to the open end OE side by the vertical movement mechanism 32.
  • the brush 27 is disposed in such a posture that the tip thereof faces the second space 282. Accordingly, when the vertical movement mechanism 32 is driven to raise the holding table 10, the molded product M held on the holding table 10 is also raised together (FIG. 17A), and the useful part P of the molded product M is raised. The upper surface (closed end CE side) is pressed against the tip of the brush 27 (FIG. 17B). Since the linear member 271 of the brush 27 is made of a material that can be elastically deformed, the linear member 271 presses the useful portion P downward while being slightly bent by the reaction force received from the molded product M. Starting from the cut NT, the gate G is deformed so as to be bent in the opposite direction to the previous deformation (FIG. 17C).
  • a compressive force acts on the surface of the lower gate G, and a tensile force acts on the surface of the upper gate G.
  • the lower surface is compressed and becomes brittle, and the upper surface is elongated and becomes brittle. That is, here, in the previous deformation, the compressive force acts on the surface on which the tensile force is applied, and the tensile force acts on the surface on which the compressive force is applied.
  • a crack is generated in the embrittled gate G (remaining portion G2), and the generated crack progresses, so that the gate G is cut starting from the cut NT (FIG. 17D). Thereby, the useful part P and the unnecessary part U are separated.
  • the brush 27 is aligned in a substantially straight line so that the front ends (that is, the front ends 271 a of the plurality of linear members 271) are along the longitudinal direction of the useful part P, as viewed in a plan view. It has been.
  • the tip of the brush 27 is in uniform contact with substantially the entire longitudinal direction of the useful part P.
  • the linear member 271 that abuts the useful part P in the vicinity of the connection part (that is, the remaining part G2) between the gate G and the useful part P has a force that bends the gate G and divides the useful part P from the gate G. It acts on the molded product M.
  • the force which suppresses that the useful part P twists acts on the molded article M by the linear member 271 which contact
  • the extending direction of the linear member 271 forms an angle of approximately 45 ° with respect to the extending direction of the useful portion P. Intersect.
  • the aggregated linear members 271 become the useful part P.
  • they come into contact with each other they are separated, and there is a risk that the force is difficult to act.
  • the assembled plurality of linear members 271 are separated when contacting the useful part P, and the force May become difficult to act.
  • the extending direction of the useful portion P and the extending direction of the linear member 271 intersect (however, excluding the case of being orthogonal to each other), so that the aggregated linear members 271 are separated.
  • the gate G and the useful part P can be more reliably separated.
  • the linear member 271 located on the side away from the gate G will extend until it contacts the tip of the runner R. There is. For this reason, in this embodiment, the front-end
  • the length of the linear member 271 increases as it approaches the gate G (L1> L2).
  • the bending rigidity is smaller than the bending rigidity on the short side of the linear member 271. Therefore, the stress applied to the gate G with respect to the displacement (that is, the moving amount of the holding base 10 that rises) changes more slowly than the short side of the linear member 271. As a result, stress can be reliably concentrated on the embrittled portion of the gate G, leading to cutting, and generation of burrs and whiskers can be suppressed.
  • a protruding portion 271c that protrudes slightly toward the runner R side than the connecting portion between the useful portion P and the gate G is provided at the tip of the brush 27.
  • the separation confirmation step S6 In the molded product M, whether or not the useful part P and the unnecessary part M are separated is confirmed in the separation confirmation step S6.
  • a camera or the like is directed to the gate G to check whether the useful part P and the unnecessary part M are separated.
  • the bending of the gate G by the brush 27 is performed again in the separation step S5.
  • the tip of the brush 27 is pressed against the lower side (opening end OE side) of the useful part P, and the gate G is bent. And it transfers to separation confirmation process S6, and it is checked whether useful part P and unnecessary part M were separated.
  • the holding table 10 is swung up and down around the brush 27, and the plurality of times. Then, the gate G is bent by the brush 27.
  • the cut useful part P falls down and is collected by a collection box (not shown).
  • the gate cut device 1 discharges the unnecessary part U and then repeatedly executes the preparation step S1 to the separation confirmation step S6.
  • the gate cut device 1 In discharging the unnecessary portion U, the gate cut device 1 first moves to the retreat position while the unnecessary portion U is sucked and held on the holding base 10. Then, the rotational movement mechanism 33 is driven to put the holding table 10 upside down. Then, after operating a switching valve (not shown) to secure a path for supplying compressed air from the compressed air supply device (not shown) to the bellows pipe 13, the compressed air is supplied to the internal space of the bellows pipe 13.
  • the unnecessary portion U is ejected toward the discharge chute 40.
  • the unnecessary portion U is guided to the discharge chute 40 and collected by an unnecessary portion collection box (not shown).
  • the gate cut method and the gate cut device 1 of the present embodiment have the following effects.
  • the molded product exhibits physical properties with high compressive strength relative to tensile strength, and vice versa. May show physical properties.
  • the molded product is advanced only in one direction with respect to the member in contact with the molded product, so that only one of the tensile force and the compressive force acts on one surface of the gate, and the other In some cases, only one of the tensile force and the compressive force acts on the surface.
  • the gate may not be sufficiently brittle.
  • a surface solidified layer (skin layer) that is rapidly cooled and solidified in the mold is formed on the surface.
  • molecular chains are strongly oriented, and there is a risk of peeling from the inside when a load is applied. In this way, if the gate is forcibly bent and cut while it is not sufficiently brittle, the gate cut (particularly near the surface) will bend, twist, or extend, resulting in poor gate cuts such as whiskers and burrs. May occur.
  • the gate G is bent from the closed end CE side after the gate G is bent from the open end OE side, and therefore one surface of the gate G (for example, the surface on the open end OE side). Both the tensile force and the compressive force can be applied to the other surface, and both the tensile force and the compressive force can be applied to the other surface (the surface on the closed end CE side). Thereby, it can suppress that the cutting defect in the gate G arises.
  • a timing at which a tensile force is applied to one surface of the gate G and a compressive force is applied to the other surface can be performed with a time shift.
  • the gate G is bent from the opening end OE side, so that concentrated stress can be reliably generated in the cut NT in the molded product M.
  • the brush 27 is held at the center.
  • the gate G can be bent by the brush 27 over a plurality of times. Thereby, the useful part P and the unnecessary part U can be separated more reliably.
  • tip 271a of the several linear member 271 is arrange
  • the extending direction of the linear member 271 In a mode in which the extending direction of the useful part P intersects (except when orthogonal), the linear member 271 located on the side away from the gate G is prevented from contacting the tip of the runner R. is doing. Thereby, it can suppress that the force which acts on the useful part P will disperse
  • the length of the linear member 271 becomes longer as it approaches the gate G, the stress applied to the gate G with respect to the displacement is relatively near the connection portion between the useful portion P and the gate G. It changes slowly. Thereby, it is possible to reliably concentrate the stress on the embrittled portion of the gate G, thereby leading to cutting, and further suppress the generation of burrs and whiskers.
  • the fitting groove 121 in the holding base 10 has a pair of inclined surfaces 122a and 122b (123a and 123b) corresponding to the pair of inclined surfaces R1a and R1b of the runner R.
  • the pair of inclined surfaces R1a and R1b of the runner R are the pair of inclined surfaces 122a and 122b (123a and 123b) of the fitting groove 121.
  • the molded product M can be positioned with respect to the holding table 10.
  • the suction port 132 is easy to closely_contact
  • a larger frictional resistance can be generated.
  • the molded product M can be more firmly adsorbed and held on the bellows tube 13.
  • the length of the linear member 271 constituting the brush 27 is increased as it approaches the gate G, but this is the vicinity of the useful portion in the vicinity of the connection portion between the gate G and the useful portion P.
  • a gap is produced between the bending rigidity of the linear member 271 that abuts on the P and the bending rigidity of the linear member 271 that abuts on the useful part P except in the vicinity of the connection part between the gate G and the useful part P,
  • the purpose is to moderate the fluctuation of the stress applied in the vicinity of the connecting portion between the gate G and the useful portion P.
  • the bending rigidity may be separated by changing the member in accordance with the portion in contact with the useful portion P.
  • the first member 271 ⁇ / b> B that contacts the useful part P in the vicinity of the connection part between the gate G and the useful part P, and other than the vicinity of the connection part between the gate G and the useful part P
  • the contact member 27B having the second and third members 272B and 273B that contact the useful part P can be used instead of the brush 27.
  • the second and third members 272B, 273B act on the molded product M with a force that prevents the useful portion P from being twisted.
  • the first member 271B bends the gate G and causes the molded product M to have a force that divides the gate G and the useful portion P.
  • the first member 271B is made of a material having a Young's modulus that is relatively smaller than the Young's modulus of the material constituting the second and third members 272B and 73B. Since the stress applied to the gate G with respect to the displacement gradually changes in the vicinity of the connecting portion with G, the stress can be surely concentrated at the embrittled portion of the gate G to lead to cutting.
  • the tip of the first member 271B slightly protrudes to the runner R side from the connection portion between the useful portion P and the gate G.
  • the tip of the first member 271B is in sliding contact with the cut portion of the useful portion P and the gate G to remove burrs and whiskers protruding from the cut portion, but the material of the first member 271B is Young. By adjusting the rate, these can be removed more efficiently.
  • the bending rigidity is adjusted by changing the length and the Young's modulus of the constituent material. You may adjust by changing the cross-sectional area and density of a member or a contact member.
  • the arrangement of the brush 27 is not particularly limited to the case of the above-described embodiment.
  • the first brush may be fixed near the tip of the second protrusion in a posture in which the extending direction is inclined to the + X direction side with respect to the Y direction.
  • the second brush may be fixed near the tip of the wide portion so that the extending direction is inclined to the ⁇ X direction side with respect to the Y direction.
  • the first and second brushes are arranged such that the tips of the first and second brushes approach each other as the tips of the first and second brushes approach the separation plate.
  • second protrusion 231 ... upper surface 24a, 24b ... wide portions 25a, 25b ... first recess 26a, 26b ⁇ Second recess 27 (27a, 27b) ⁇ brush (first and second brush) 271 ... Linear member 271a ... Tip 271b ... Base end 271c ... Projection part 272 ... Bundling member 273 ... Annular part 27B ... Contact member 271B ... First Member 272B ... Second member 273B ... Third member 281, 282 ... First and second spaces 291, 292 ... First and second slits 30 ... Moving mechanism 31 ... Horizontal movement mechanism 311 ... Traveling rail 312 ... Traveling body 32 ... Vertical movement mechanism 321 ...
  • Elevating frame 322 ... Traveling body 33 ... Rotary movement mechanism 331 ... Arm 332 ... Rotary shaft 40 ... Chute 50 ... Negative pressure generator 60 ... Control device 70 ... Device frame M ... Molded product P ... Useful part U ... Unnecessary part S ... ⁇ Sp W ... Large diameter part A ... Suction surface C ... Slag well R ... Runner R1a, R1b ... Inclined surface R1c ... Bottom G ... Gate NT ... Cutting OE .... Open end CE ... Closed end G2 ... Remaining part

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)

Abstract

L'invention concerne un procédé de coupe de grille comprenant : une étape de préparation (S1) afin de préparer un moulage (M), présentant des parties utiles P et des parties inutiles (U) qui sont liées aux parties utiles (P) par l'intermédiaire de grilles (G) munies d'une encoche (NT) ; une étape de maintien (S3) afin de maintenir le moulage (M) sur un support (10) ; et une étape de séparation (S5) afin de séparer les parties utiles (P) du moulage (M). L'étape de séparation (S5) consiste à presser des première et seconde saillies (22, 23) contre les parties utiles (P) à partir du côté extrémité ouverte (OE) et à plier les grilles (G) à partir du côté extrémité ouverte, et, après le pliage des grilles à partir du côté extrémité ouverte, à presser des brosses (27) contre les parties utiles (P) à partir du côté extrémité fermée (CE) et à plier les grilles (G) à partir du côté extrémité fermée pour couper les grilles (G) à l'aide des encoches (NT) en tant que points de départ. Le côté extrémité ouverte (OE) est le côté des grilles (G) sur lequel les encoches (NT) s'ouvrent et le côté extrémité fermée (CE) est le côté opposé au côté extrémité ouverte (OE).
PCT/JP2016/070122 2015-07-09 2016-07-07 Procédé de coupe de grille et dispositif de coupe de grille WO2017006990A1 (fr)

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JP2015137839A JP5985018B1 (ja) 2015-07-09 2015-07-09 ゲートカット方法及びゲートカット装置
JP2015-137839 2015-07-09

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
TWI737488B (zh) * 2019-11-15 2021-08-21 南韓商考姆愛斯股份有限公司 一種改進了下模具的透鏡澆口切割模具裝置
WO2024068603A1 (fr) * 2022-09-26 2024-04-04 Igus Gmbh Procédé et appareil pour séparer des pièces moulées d'un moulage déchargé d'une machine de moulage par injection

Citations (4)

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JPH0516168A (ja) * 1991-07-08 1993-01-26 Fujitsu Ltd モールド成型品のゲート残り分離方法及び分離装置
JPH07266383A (ja) * 1994-03-30 1995-10-17 Rohm Co Ltd 電子部品用リードフレームからロス合成樹脂を分離する方法およびこれを用いた分離装置
JPH07299847A (ja) * 1994-05-09 1995-11-14 Niigata Polymer Kk 薄肉シート状成形品の製造方法
JP2008238686A (ja) * 2007-03-28 2008-10-09 Yushin Precision Equipment Co Ltd 導光板の成形方法

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JP2011210894A (ja) * 2010-03-29 2011-10-20 Fujitsu Semiconductor Ltd 半導体装置の製造方法及び基板

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0516168A (ja) * 1991-07-08 1993-01-26 Fujitsu Ltd モールド成型品のゲート残り分離方法及び分離装置
JPH07266383A (ja) * 1994-03-30 1995-10-17 Rohm Co Ltd 電子部品用リードフレームからロス合成樹脂を分離する方法およびこれを用いた分離装置
JPH07299847A (ja) * 1994-05-09 1995-11-14 Niigata Polymer Kk 薄肉シート状成形品の製造方法
JP2008238686A (ja) * 2007-03-28 2008-10-09 Yushin Precision Equipment Co Ltd 導光板の成形方法

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
TWI737488B (zh) * 2019-11-15 2021-08-21 南韓商考姆愛斯股份有限公司 一種改進了下模具的透鏡澆口切割模具裝置
WO2024068603A1 (fr) * 2022-09-26 2024-04-04 Igus Gmbh Procédé et appareil pour séparer des pièces moulées d'un moulage déchargé d'une machine de moulage par injection

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JP2017019169A (ja) 2017-01-26

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