JPH03142214A - Injection molding method - Google Patents
Injection molding methodInfo
- Publication number
- JPH03142214A JPH03142214A JP28110289A JP28110289A JPH03142214A JP H03142214 A JPH03142214 A JP H03142214A JP 28110289 A JP28110289 A JP 28110289A JP 28110289 A JP28110289 A JP 28110289A JP H03142214 A JPH03142214 A JP H03142214A
- Authority
- JP
- Japan
- Prior art keywords
- injection molding
- projected
- long
- protrusions
- resin tank
- Prior art date
- Legal status (The legal status 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 status listed.)
- Pending
Links
- 238000001746 injection moulding Methods 0.000 title claims abstract description 15
- 239000011347 resin Substances 0.000 claims abstract description 24
- 229920005989 resin Polymers 0.000 claims abstract description 24
- 238000000465 moulding Methods 0.000 abstract description 9
- 239000000945 filler Substances 0.000 abstract description 6
- 239000003365 glass fiber Substances 0.000 abstract description 4
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000012778 molding material Substances 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F21/00—Constructions of heat-exchange apparatus characterised by the selection of particular materials
- F28F21/06—Constructions of heat-exchange apparatus characterised by the selection of particular materials of plastics material
- F28F21/067—Details
-
- 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
- B29C45/0025—Preventing defects on the moulded article, e.g. weld lines, shrinkage marks
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F2255/00—Heat exchanger elements made of materials having special features or resulting from particular manufacturing processes
- F28F2255/14—Heat exchanger elements made of materials having special features or resulting from particular manufacturing processes molded
- F28F2255/143—Heat exchanger elements made of materials having special features or resulting from particular manufacturing processes molded injection molded
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
Abstract
Description
【発明の詳細な説明】
産業上の利用分野
本発明は、射出成形法に関し、樹脂タンク、例えばラジ
ェータＷ・ヒータコアの熱交換器に使用する樹脂タンク
の製造に適した射出成形法に関する。DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an injection molding method, and relates to an injection molding method suitable for manufacturing a resin tank, for example, a resin tank used in a heat exchanger for a radiator W/heater core.
従来の技術
ラジェータ☆・ヒータコアの熱交換器に使用される樹脂
タンクは、パイプ等の突起物が相対する長側面の一方の
側に偏在して設げられている。その射出成形は、ガラス
繊維等の充填材を配合した成形材料を用いて行なわれ、
成形品の短側面の側にゲートを配置するのが一般的であ
る。BACKGROUND ART A resin tank used in a heat exchanger for a radiator/heater core is provided with protrusions such as pipes unevenly distributed on one side of opposing long sides. The injection molding is performed using a molding material containing fillers such as glass fiber,
It is common to place the gate on the short side of the molded product.
この成形品は、成形後に突起物がある側を凹として反り
やすく、樹脂タンクの組付は性を損なう。そこで、成形
直後に、反り防止を目的として、樹脂タンクに矯正枠を
はめる等の処置をしており、工数が増大している。After molding, this molded product tends to warp as the side with the protrusion becomes concave, and the assembly of the resin tank is impaired. Therefore, immediately after molding, measures such as fitting a straightening frame into the resin tank are taken to prevent warping, which increases the number of man-hours.
発明が解決しようとする課題
上記のように、相対する長側面の一方の側に突起物が偏
在している成形品を得るのに、成形品の短側面に配置し
たゲートから樹脂を射出して成形すると、突起物がある
側を凹として成形後に反りが発生する。Problems to be Solved by the Invention As mentioned above, in order to obtain a molded product in which protrusions are unevenly distributed on one side of the opposing long sides, it is necessary to inject resin through a gate placed on the short side of the molded product. When molded, the side with the protrusion becomes concave and warpage occurs after molding.
本発明の課題は、相対する長側面の一方の側に突起物が
偏在している成形品を得るときに、上記反りを抑制する
ことである。An object of the present invention is to suppress the above-mentioned warping when obtaining a molded product in which protrusions are unevenly distributed on one side of opposing long sides.
課題を解決するための手段
上記課題を解決するために、本発明に係る射出成形法は
、ゲートを成形品の短側面側と、相対する長側面のうち
突起物がない長側面側とに配置して射出成形することを
特徴とする。Means for Solving the Problems In order to solve the above problems, the injection molding method according to the present invention includes arranging the gate on the short side of the molded product and on the long side of the opposing long side where there are no protrusions. It is characterized by being injection molded.
作用
突起物がある側を凹として反りが発生するのは次の理由
による。す々わち、射出成形時に樹脂はその流れ方向に
配向するが、ガラス繊維等の長さのある充填材もその方
向に配向する。ところが突起物の存在する部分では樹脂
の流れが乱れ、前記配向が行々われない。成形品は、成
形後に樹脂の収縮現象があり、充填材はそれを抑制する
方向に働らくのであるが、６充填材の配向していない突
起物周辺は樹脂の収縮を十分抑制できず、他の部分に比
べて収縮が大きい。結局、突起物が存在する側の面の収
縮が、反対側の面の収縮より大きくなり、突起物側を凹
にした反りが発生しているのである。The reason why warpage occurs when the side where the working protrusion is concave is as follows. That is, during injection molding, the resin is oriented in the direction of its flow, and the length of the filler material, such as glass fiber, is also oriented in that direction. However, in the area where the protrusions are present, the flow of the resin is disturbed and the orientation is not performed. In molded products, there is a phenomenon of resin shrinkage after molding, and the filler works to suppress this, but around the protrusions where the filler is not oriented, the shrinkage of the resin cannot be sufficiently suppressed, and other The shrinkage is larger than that of the part. As a result, the shrinkage of the surface on the side where the protrusions are present becomes greater than the shrinkage of the opposite surface, resulting in warpage with the protrusions side being concave.
本発明に係る成形法では、通常配置される短側面側のゲ
ートに加えて、突起物がｆ、い長側面の側にもゲートを
備えて樹脂を射出する。従って、突起物のない側の面に
も樹脂の流れに乱れをつくることができ、突起物のある
側とない側の成形後の樹脂の収縮を均衡させて反りの抑
制を図れるのである。In the molding method according to the present invention, in addition to the normally arranged gate on the short side side, a gate is also provided on the long side side where the protrusion is f, and resin is injected. Therefore, it is possible to create turbulence in the resin flow on the side without the protrusions, and to balance the shrinkage of the resin after molding on the side with the protrusions and the side without the protrusions, thereby suppressing warping.
実施例 次に、本発明に係る射出成形法の実施例を説明する。Example Next, an example of the injection molding method according to the present invention will be described.
第１図、第２図に示すような長尺の樹脂タンク１を射出
成形した。樹脂タンク１はガラス繊維を充填材として含
んでおり、ラジェータ咄・ヒータコアの熱交換器に使用
するものである。A long resin tank 1 as shown in FIGS. 1 and 2 was injection molded. The resin tank 1 contains glass fiber as a filler and is used in a heat exchanger for a radiator and a heater core.
長尺の一方の面には、チューブ接続用のパイプ２をはじ
めとする突起物が一体に成形されている。Projections including a pipe 2 for tube connection are integrally formed on one long surface.
樹脂タンク１の７ランジ３の部分にゲートを設けて射出
成形するのであるが、ゲート４，５を、それぞれ短側面
側と突起物のない長側面側とに位置させて射出成形を行
なった。Injection molding was performed with a gate provided at the 7-lunge 3 portion of the resin tank 1, and injection molding was performed with the gates 4 and 5 located on the short side and the long side without protrusions, respectively.
この成形品の突起物側を凹とする反りの量は４゜
１．８４ ｎ＋ｎ＋であり、ゲート５を設けない場合の
反りの量３．４１ ｍｍより小さ（抑えることができた
。The amount of warpage of this molded product with the protrusion side concave was 4°1.84 n+n+, which was smaller than the amount of warpage of 3.41 mm when the gate 5 was not provided (it was possible to suppress it).
発明の効果
上述のように、本発明に係る射出成形法では、突起物が
ない側の長側面にも成形時の樹脂の流れに乱れを起こし
、突起物の存在する側としない側の成形後の樹脂の収縮
を均衡させ、反りの抑制を図ることができる。その結果
、反り矯正の工数等の低減を図ることができ、その工業
的価値は極めて大である。Effects of the Invention As described above, in the injection molding method according to the present invention, turbulence is caused in the flow of resin during molding even on the long side of the side where there are no protrusions, and the flow of the resin on the side where the protrusions are present and after molding on the side where there are no protrusions is turbulent. It is possible to balance the shrinkage of the resin and suppress warpage. As a result, it is possible to reduce the number of man-hours required for straightening warpage, and the industrial value thereof is extremely large.
第１図はゲートの配置位置を示す樹脂タンクの平面図、
第２図は第１図の側面図である。
１は樹脂タンク、２はパイプ（突起物）、４゜５はゲー
ト。Figure 1 is a plan view of the resin tank showing the location of the gate;
FIG. 2 is a side view of FIG. 1. 1 is the resin tank, 2 is the pipe (protrusion), and 4°5 is the gate.
Claims (1)
品の射出成形において、ゲートを成形品の短側面側と、
相対する長側面のうち前記突起物がない長側面側とに配
置することを特徴とする射出成形法。 ２、成形品が樹脂タンクである請求項１記載の射出成形
法。[Claims] 1. In injection molding of a molded product in which protrusions are unevenly distributed on one side of opposing long sides, the gate is placed on the short side of the molded product,
An injection molding method characterized in that the protrusion is placed on one of the opposing long sides on which the protrusion does not exist. 2. The injection molding method according to claim 1, wherein the molded product is a resin tank.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP28110289A JPH03142214A (en) | 1989-10-27 | 1989-10-27 | Injection molding method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP28110289A JPH03142214A (en) | 1989-10-27 | 1989-10-27 | Injection molding method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH03142214A true JPH03142214A (en) | 1991-06-18 |
Family
ID=17634376
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP28110289A Pending JPH03142214A (en) | 1989-10-27 | 1989-10-27 | Injection molding method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH03142214A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2013121699A1 (en) * | 2012-02-17 | 2013-08-22 | 株式会社デンソー | Tank for heat exchanger, and method for manufacturing same |
-
1989
- 1989-10-27 JP JP28110289A patent/JPH03142214A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2013121699A1 (en) * | 2012-02-17 | 2013-08-22 | 株式会社デンソー | Tank for heat exchanger, and method for manufacturing same |
| JP2013167431A (en) * | 2012-02-17 | 2013-08-29 | Denso Corp | Tank for heat exchanger |
| US20150014324A1 (en) * | 2012-02-17 | 2015-01-15 | Denso Corporation | Tank for heat exchanger, and method for manufacturing the same |
| US9897395B2 (en) | 2012-02-17 | 2018-02-20 | Denso Corporation | Tank for heat exchanger, and method for manufacturing the same |
| DE112013000978B4 (en) * | 2012-02-17 | 2020-01-30 | Denso Corporation | Tank for a heat exchanger and method of manufacturing the same |
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