WO2001096091A1 - Dispositif de degazage applicable au moulage par injection - Google Patents

Dispositif de degazage applicable au moulage par injection Download PDF

Info

Publication number
WO2001096091A1
WO2001096091A1 PCT/JP2001/005183 JP0105183W WO0196091A1 WO 2001096091 A1 WO2001096091 A1 WO 2001096091A1 JP 0105183 W JP0105183 W JP 0105183W WO 0196091 A1 WO0196091 A1 WO 0196091A1
Authority
WO
WIPO (PCT)
Prior art keywords
plug
pin
runner
gas
injection molding
Prior art date
Application number
PCT/JP2001/005183
Other languages
English (en)
Japanese (ja)
Inventor
Kyuziro Sakurai
Original Assignee
Yuhgen Kaisha Sanei Mold
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from JP2000182105A external-priority patent/JP4085182B2/ja
Priority claimed from JP2000322267A external-priority patent/JP4096327B2/ja
Application filed by Yuhgen Kaisha Sanei Mold filed Critical Yuhgen Kaisha Sanei Mold
Priority to AU74543/01A priority Critical patent/AU7454301A/en
Publication of WO2001096091A1 publication Critical patent/WO2001096091A1/fr

Links

Classifications

    • 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
    • B29C45/26—Moulds
    • B29C45/27—Sprue channels ; Runner channels or runner nozzles
    • B29C45/2701—Details not specific to hot or cold runner channels
    • 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
    • B29C45/26—Moulds
    • B29C45/34—Moulds having venting means

Definitions

  • the present invention relates to a degassing device for injection molding for producing various products by filling a mold with molten raw materials, and a protrusion pin used for the device.
  • Injection molding has the same concept as metal molds that have been used for a long time, so it is necessary to discharge the air inside the mold to the outside when pouring the material into the mold.
  • Various ideas have been devised. At present, a method is generally used in which gas is vented from the space provided around the protruding pin E to the movable platen B side.
  • a material with a good degassing effect cannot avoid inevitably causing the material to flow into the space and generating a large amount of burr on the obtained product. Considerations that are different from the traditional metal mold construction are needed.
  • burr generation in the case of injection molding using synthetic resin, high-precision dies that can omit secondary processing after molding are currently being supplied. It has been discovered that this degassing is of great importance in terms of manufacturing, etc.
  • the idea of the present invention is to form a cutout portion for exhaust and a gas vent groove in the outer peripheral portion of the protruding pin, and use a narrow portion (a narrow portion) provided between the two to fill the material with the material.
  • Generated gas is quickly discharged from the notch into the gas vent groove, and the narrowed part increases the gas pressure in the notch and simultaneously exerts a depressurizing effect toward the gas vent groove.
  • Prevents the material from entering the notch and causing burrs and projections on the product.Rapid degassing almost completely prevents the formation of silver line patterns and rough surfaces around the vent holes.
  • the location of the degassing device is optional at any point where it is continuous with the runway of the filling material installed inside the mold.However, considering the discharge of the extracted gas to the outside of the machine, The end A of the runner R and the end C of the sprue S in the overall conceptual diagram of the running of the material shown in 15 are ideal. In the figure, the end A of the runner R is bent to reach the pin gate P, and is filled in the product M, and the gas in the product M is extracted by the ejection pin D. If necessary, a gas vent may be provided on the runner R between the sprue S and the end A of the runner R.
  • Plugs for degassing devices such as end A of runner R and end C of sprue S, must have different external shapes due to design needs, but they have circular cross sections, square cross sections or multiple cross sections.
  • the point of having a notch, a narrow part, and a gas vent on the outer peripheral surface of the rectangular gas venting part is exactly the same as in Japanese Patent Application No. 2000-180210.
  • FIG. 1 is a conceptual cross-sectional view showing a state before material filling of an injection molding machine.
  • FIG. 2 is a conceptual cross-sectional view showing the separated state of the mold after filling the material of FIG.
  • FIG. 3 is a sectional view of a mold in which the degassing device according to the present invention is installed at the end of a runner.
  • FIG. 4 is a perspective view of a first example pin used in the present invention.
  • FIG. 5 is a partially enlarged sectional view of the device shown in FIG.
  • FIG. 6 is a sectional view of a mold in which the degassing device according to the present invention is installed at the end of the sprue by using the pin of the second example.
  • FIG. 7 is a sectional view of a mold in which the degassing device according to the present invention is installed at the end of the sprue by using the pin of the third example.
  • FIG. 8 is a sectional view of a pin of the third example.
  • FIG. 9 is a perspective view of the pin of the third example.
  • FIG. 10 is a bottom view of the inner cylinder of the pin of the third example.
  • FIG. 11 is a plan view of the inner cylinder of the pin of the third example.
  • FIG. 12 is a side view of the inner cylinder of the pin of the third example.
  • FIG. 13 is a perspective view showing a deformation of the pin of the first example.
  • FIG. 14 is a plan view of the pin shown in FIG.
  • FIG. 15 is a conceptual perspective view showing the relationship between a runner and a product in injection molding.
  • FIG. 16 is a conceptual diagram showing the relationship between the runner and the degassing device, and is a cross-sectional view showing a stage before material filling.
  • FIG. 17 is a conceptual diagram showing the relationship between the runner and the degassing device, and is a cross-sectional view showing the initial stage of material filling.
  • Fig. 18 is a conceptual diagram showing the relationship between the runner and the degassing device, and is a cross-sectional view showing the middle stage of material filling.
  • FIG. 19 is a conceptual diagram showing the relationship between the runner and the degassing device, and is a cross-sectional view showing the stage when the material filling is completed.
  • FIG. 20 is a conceptual diagram of a conventional injection molding apparatus, showing a state in which the apparatus has not been started before filling.
  • FIG. 21 shows the working injection state of the one shown in FIG.
  • FIG. 22 shows the ejection pin operating state after the injection of the one of FIG. BEST MODE FOR CARRYING OUT THE INVENTION
  • FIG. 1 and 2 are sectional views showing the concept of a fixed die G and a movable cavity F in an injection molding machine and a runner R and a core K formed thereby.
  • N in the right of the figure indicates the nozzle of the molding machine.
  • the fixed die G, movable cavity F and movable core E on the stationary side of the molding machine form a filling channel for the filling material and a cavity for the object to be molded as shown in Fig. 1.
  • the material runs along the runner R to reach the pin gate P, from where it flows into the core K, and the filling is completed.
  • the movable core E and the movable cavity F are separated from the fixed mold G as shown in FIG. 2, and the product M placed on the movable core E is pushed out by a protruding pin as shown by an arrow T.
  • Runner One part of the runner R that is maintained on the runner plate RP by the lock pin RL is the runner plate RP from the fixed type G
  • the engagement with the runner lock pin RL is released, and the state shifts to a state where it can be taken out.
  • the part formed by solidifying the material filled in each mold is the product M inside the core K formed by the movable core E and the movable cavity F, and between the movable core F and the fixed die G.
  • This is the waste material J inside the runner R formed at the end of the run, but the waste material J has to be disposed of unless it can be reused.
  • the product M and the scrap J are shown as conceptual slopes in Fig. 15, but in actual injection molding, the volume occupied by this scrap J is much greater than in this conceptual diagram.
  • the size is large, and depending on the type of product, it is not unusual for the amount of material occupied by the offcuts J to be larger than the actual product M. ⁇ Here, the generated gas in the core K that forms the product M Along with discharging
  • the portion indicated by reference numeral 5 in FIGS. 3 and 4 is a knurled portion installed on the outer peripheral surface of the plug 1, and in the case of this embodiment, the plug chamber V is directly exposed to the outside atmosphere. Since the plug 1 is open, the plug 1 is manufactured by adjusting the outer diameter of the plug 1 to the inner diameter of the plug chamber V, and the knurled portion 5 is provided on the outer peripheral surface of the plug 1 to drive the plug 1 into the plug chamber V. Can be fixed.
  • FIG. 5 is an enlarged sectional view of a part of the plug 1 showing a part of FIG. 3 in a cross section.
  • FIGS. 13 and 14 show modifications of the plug 1 shown in FIG. 4.In these examples, the cylindrical plug 1 has two sets of notches 2, a narrow portion 3, and a gas vent groove 4. Are drilled 180 degrees apart from each other.
  • Fig. 6 shows the plug la when gas is vented from the end C of the sprue S described above.
  • it is desirable to make a slight change to the structure of the plug 1a because there is a slight structural difference from the venting of the runner R end.
  • the difference between the two is that in many cases it is generally difficult to directly open the end of the sprue S part to the outside atmosphere because of the mold structure.
  • the plug 1a is inserted into the plug chamber Va from the opening toward the sprue S portion.
  • the wall surface W of the exhaust passage Vb faces the opening of the plug chamber Va, the plug 1a can be fixed in the plug chamber Va using the wall surface W.
  • the plug la to be inserted has notches 2, narrow portions 4, and gas vent grooves 4 as shown in FIG.
  • the structure of the plug 1a is such that a protruding rod 6 is installed at an end of the plug 1a having a circular cross section, and a cutout 2, a narrow portion 3 and a gas vent groove 4 are formed in the outer peripheral surface of the plug 1a. This is the same as in the above-described embodiment. However, in this embodiment, since the plug la needs to slide in the plug chamber Va, the outer peripheral surface is not knurled.
  • the shape of the plug 1 or the plug 1a is not limited to the two examples shown in the drawings, and as shown in FIGS. 13 and 14, a plurality of notches 2 are formed on the outer peripheral surface of the plug 1.
  • the narrow portion 3 and the gas vent groove 4 may be provided by drilling, or a plurality of notches 2 of the plug 1a may be provided as only one set.
  • the plug 1 or the plug 1a is inserted into the plug chamber V or the plug chamber Va drilled in the molding die, and a notch 2 is formed between the inner wall of the plug chamber and the outer peripheral surface of the plug.
  • the narrow part 3 and the gas vent groove 4 were established, in such a method, the design was slightly changed for each place where the gas venting device was installed, and for example, the projecting rod 6 was attached to the plug 1.
  • unnecessary labor and a complicated number of parts are required.
  • the plug is constituted by an outer cylinder 7 and an inner cylinder 8.
  • a truncated cone-shaped lumen 9 is bored in the outer cylinder 7, and the inner cylinder 8 inserted into the lumen 9 adopts a truncated cone or a cone.
  • a notch 2 similar to that of the previous embodiment is formed in the portion corresponding to the bottom surface 8a of the inner cylinder 8 such as a truncated cone, and a narrow portion 3 and a gas vent groove 4 are formed from there toward the apex of the cone. Install You.
  • FIG. 9 is a perspective view of FIG. 8, in which the truncated cone shape of the lumen 9 of the outer cylinder 7 and the truncated cone shape of the inner cylinder 8 are similar, and the diameter of the bottom surface of the inner cylinder 8 is the lumen. It is set smaller than the diameter of the bottom surface of 9, and when the inner cylinder 8 is inserted into the lumen 9, a gap 10 is formed near the bottom surface of the lumen 9 as shown in FIGS. 8 and 9.
  • the shape of the inner cylinder 8 is as shown in Fig. 11 of Fig. 10, and a notch 2 is provided on the bottom surface 8a, followed by a narrow portion 3 and a gas vent groove 4.
  • four notches 2, a narrow portion 3, and a gas vent groove 4 are provided at intervals of 90 degrees.
  • FIG. 1 An example in which the plug formed in this way is placed at the end of the sprue S portion, for example, is shown in FIG.
  • the outer cylinder 7 is embedded in one movable type F, and the inner cylinder 8 is inserted into the inner cavity 9 thereof.
  • the apex of the truncated cone presented by the bore 9 of the outer cylinder 7 opens to the exhaust passage Vb as an opening having a smaller area than the bottom surface, and the end of the inner cylinder 8 inserted into the lumen 9 is slightly exhausted. Protrudes into passage Vb.
  • the generated gas flows into the notch 2 formed between the wall surface of the inner cavity 9 of the outer cylinder 7 and the inner cylinder 8, and the narrow part 3
  • the gas is quickly discharged into the gas vent groove 4 while being decompressed, and is also decompressed when flowing out into the exhaust passage Vb, and is almost immediately discharged from the exhaust passage Vb to the outside of the mold.
  • the advantage of this embodiment is that when the number of filling shots increases and wear or damage occurs at the notch 2, etc., all can be renewed simply by replacing the inner cylinder 8.
  • the inner cylinder 8 It should be noted that the height of the sprue can be freely selected, so that it can be designed freely according to the required length of the sprue S.
  • the inner cylinder 8 and the inner cavity 9 of the outer cylinder 7 exhibiting a truncated cone shape are described. However, these are not limited to the truncated cone shape, and it is a matter of course that any polygonal truncated pyramid shape can be used. Don't wait.
  • FIG. 16 shows the state of starting material filling
  • Fig. 17 shows the state where the material is filled from the nozzle N to the entrance of the runner R
  • Fig. 18 shows the state where the filled material advances to the end A of the runner R
  • Fig. 19 shows the state in which the filled material reaches the pin gate P and is filled in the core K.
  • any of the degassing devices operates to reduce the generated gas. Discharge from runner R.
  • the plug 1 it is also possible to use a plug constituted by the outer cylinder 7 and the inner cylinder 8 described in the embodiment.
  • the generated gas inside the runner R could not be exhausted instantaneously, and a low and low gas pressure was resident in the runner R.
  • the generated gas is exhausted from the core K by the pressure, but according to the present invention, the generated gas in the core K is quickly and reliably exhausted to the outside prior to the advance of the filling material.
  • the filling material filled in the runner R smoothly runs in the runner R without being subjected to gas pressure resistance, and is directly fed from the pin gate P into the core K.

Landscapes

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

Abstract

L'invention concerne un dispositif de dégazage applicable au moulage par injection, dans lequel une partie de découpe est formée par projection d'une broche saillante au delà d'une différence dimensionnelle spécifiée entre un trou de broche et la broche saillante, de manière que la partie d'extrémité de ladite broche, faisant face à une cavité, s'élargisse et se rétrécisse vers la partie d'extrémité arrière puis découpe le bord périphérique de la broche saillante en biais dans une ou plusieurs positions, la section rétrécie de la partie de découpe étant ouverte vers un canal d'évacuation du gaz situé au niveau de la partie d'extrémité arrière de la broche saillante. Lorsque le dégazage est effectué dans un canal d'injection de matière, un bouchon cylindrique, prismatique, conique ou tronqué est introduit dans une chambre s'ouvrant vers le canal d'injection de matière. La partie de découpe et le canal d'évacuation du gaz sont situés au niveau de la surface périphérique extérieure du bouchon à travers une partie étroite située au milieu, de manière à permettre la décompression et l'évacuation du gaz hors du canal d'injection de matière.
PCT/JP2001/005183 2000-06-16 2001-06-18 Dispositif de degazage applicable au moulage par injection WO2001096091A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU74543/01A AU7454301A (en) 2000-06-16 2001-06-18 Degassing device for injection molding

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
JP2000182105A JP4085182B2 (ja) 2000-06-16 2000-06-16 射出成形における突き出しピン
JP2000-182105 2000-06-16
JP2000322267A JP4096327B2 (ja) 2000-10-23 2000-10-23 射出成形におけるガス抜き装置
JP2000-322267 2000-10-23

Publications (1)

Publication Number Publication Date
WO2001096091A1 true WO2001096091A1 (fr) 2001-12-20

Family

ID=26594139

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2001/005183 WO2001096091A1 (fr) 2000-06-16 2001-06-18 Dispositif de degazage applicable au moulage par injection

Country Status (2)

Country Link
AU (1) AU7454301A (fr)
WO (1) WO2001096091A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2554349A1 (fr) * 2011-08-03 2013-02-06 The Goodyear Tire & Rubber Company Dispositif de ventilation pour moule
JP2019064000A (ja) * 2017-09-28 2019-04-25 ダイハツ工業株式会社 射出成形機用ホットランナユニット
CN112203825A (zh) * 2018-05-31 2021-01-08 株式会社玉谷制作所 销、套筒或嵌件

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4830134B1 (fr) * 1964-12-04 1973-09-18
JPS58128757U (ja) * 1982-02-25 1983-08-31 トヨタ自動車株式会社 金型の押出ピン構造
JPH06304972A (ja) * 1993-04-23 1994-11-01 Sekisui Chem Co Ltd 射出成形装置
JPH0825430A (ja) * 1994-07-12 1996-01-30 Sanyo Electric Co Ltd 射出成形機のエジェクターピン
JPH0839626A (ja) * 1994-08-01 1996-02-13 Sekisui Chem Co Ltd 射出成形金型
JPH09187822A (ja) * 1996-01-11 1997-07-22 Mitsubishi Materials Corp 突き出し機構付き金型装置
US6042361A (en) * 1998-03-12 2000-03-28 Larry J. Winget Mold for use in plastic injection molding system and venting pin assembly for use therein

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4830134B1 (fr) * 1964-12-04 1973-09-18
JPS58128757U (ja) * 1982-02-25 1983-08-31 トヨタ自動車株式会社 金型の押出ピン構造
JPH06304972A (ja) * 1993-04-23 1994-11-01 Sekisui Chem Co Ltd 射出成形装置
JPH0825430A (ja) * 1994-07-12 1996-01-30 Sanyo Electric Co Ltd 射出成形機のエジェクターピン
JPH0839626A (ja) * 1994-08-01 1996-02-13 Sekisui Chem Co Ltd 射出成形金型
JPH09187822A (ja) * 1996-01-11 1997-07-22 Mitsubishi Materials Corp 突き出し機構付き金型装置
US6042361A (en) * 1998-03-12 2000-03-28 Larry J. Winget Mold for use in plastic injection molding system and venting pin assembly for use therein

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2554349A1 (fr) * 2011-08-03 2013-02-06 The Goodyear Tire & Rubber Company Dispositif de ventilation pour moule
JP2019064000A (ja) * 2017-09-28 2019-04-25 ダイハツ工業株式会社 射出成形機用ホットランナユニット
CN112203825A (zh) * 2018-05-31 2021-01-08 株式会社玉谷制作所 销、套筒或嵌件

Also Published As

Publication number Publication date
AU7454301A (en) 2001-12-24

Similar Documents

Publication Publication Date Title
CN102481627B (zh) 具有排气装置的浇注模具
EP3395534B1 (fr) Procédé de fabrication de noyau laminé et plaque du cullot
JPH09277311A (ja) 射出成形装置
TWI613018B (zh) 用以形成液態鍛造物品之方法與裝置
WO2001096091A1 (fr) Dispositif de degazage applicable au moulage par injection
JPH1190609A (ja) 射出成形装置
JP4096327B2 (ja) 射出成形におけるガス抜き装置
CN111201086B (zh) 杯或者杯带和用于制造其的方法
EP3445557B1 (fr) Procédé d'utilisation d'un appareil de moulage par injection
JPH05104530A (ja) 成形用金型
US10569332B2 (en) Moulding tool and method for powder injection moulding a cemented carbide or cermet component
JP6830982B2 (ja) ２色成形品の製造方法
JP4085182B2 (ja) 射出成形における突き出しピン
JPH03264148A (ja) 誘導電動機ロータのダイカスト金型装置
JP2707676B2 (ja) 成形金型
CN221312446U (zh) 一种铝合金母锁座压铸模具
CN112808968B (zh) 一种组合式型芯及压铸模具
CN112805100B (zh) 成型设备和使用成型设备的成型方法
JP3209294U (ja) 射出成形用金型
JPH02164509A (ja) 射出成形金型
JPS5930463A (ja) ダイカスト製造装置
JPH07108349A (ja) 鋳造用金型
JP4098441B2 (ja) 樹脂成形金型装置
JP2003181810A (ja) 金型装置
JPH08281409A (ja) 金型用ガス抜き装置および金型用ガス抜き装置を用いた鋳造方法

Legal Events

Date Code Title Description
AK Designated states

Kind code of ref document: A1

Designated state(s): AE AT AU CN ID IN KR MX RU SG US VN

AL Designated countries for regional patents

Kind code of ref document: A1

Designated state(s): AT BE CH CY DE DK ES FI FR GB GR IE IT LU MC NL PT SE TR

121 Ep: the epo has been informed by wipo that ep was designated in this application
122 Ep: pct application non-entry in european phase