CA2716902C - Coolant distribution for tool cooling - Google Patents

Coolant distribution for tool cooling Download PDF

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Publication number
CA2716902C
CA2716902C CA2716902A CA2716902A CA2716902C CA 2716902 C CA2716902 C CA 2716902C CA 2716902 A CA2716902 A CA 2716902A CA 2716902 A CA2716902 A CA 2716902A CA 2716902 C CA2716902 C CA 2716902C
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CA
Canada
Prior art keywords
coolant
cooling
fact
feeding
distribution system
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.)
Expired - Fee Related
Application number
CA2716902A
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French (fr)
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CA2716902A1 (en
Inventor
Gudrun Stemke
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Gise Deutschland & Co KG GmbH
Original Assignee
Stemke Kunststofftechnik GmbH
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Application filed by Stemke Kunststofftechnik GmbH filed Critical Stemke Kunststofftechnik GmbH
Publication of CA2716902A1 publication Critical patent/CA2716902A1/en
Application granted granted Critical
Publication of CA2716902C publication Critical patent/CA2716902C/en
Expired - Fee Related legal-status Critical Current
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Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C33/00Moulds or cores; Details thereof or accessories therefor
    • B29C33/02Moulds or cores; Details thereof or accessories therefor with incorporated heating or cooling means
    • B29C33/04Moulds or cores; Details thereof or accessories therefor with incorporated heating or cooling means using liquids, gas or steam
    • B29C33/046Moulds or cores; Details thereof or accessories therefor with incorporated heating or cooling means using liquids, gas or steam using gas
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/17Component parts, details or accessories; Auxiliary operations
    • B29C45/72Heating or cooling
    • B29C45/73Heating or cooling of the mould
    • B29C45/7337Heating or cooling of the mould using gas or steam

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Auxiliary Devices For Machine Tools (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)
  • Drilling Tools (AREA)

Abstract

The invention relates to a cooling system for cooling a tool via cooling sites (6), these being composed of a capilla-ry tube (64) associated with a supply pathway and of an expansion space (65) which is associated with a return pathway (41) and into which the capillary tube (64) leads, so that a coolant conducted in liquid form to the cooling sites (6) evaporates and is con-ducted away in the form of gas. A distributor block (1, 11), which can be connected to a coolant source and to a coolant sink, and into which coolant channels (3,31,4,41) have been moulded in at least one plane, has been designed so that it can be flanged onto a tool.

Description

Coolant Distribution for Tool Cooling Field of the Invention [0001] The tools of plastic processing machines, but also of die-casting machines, extruders, welding machines and similar systems, where heat is to be dissipated, are cooled point-wise or surface-wise, as soon as the working or processing action demands it. This draws off heat from the tool on one hand in a localized and on the other hand in an overall manner, so that the fastest possible cooling ensues and cycling times are shortened. The invention refers to such a cooling system.
Background of the Invention [0002] German Patent Document DE 199 18 428 C1 discloses a tool cooling process based on carbon dioxide (CO2), designed to cool off tool areas with excess temperatures in a localized fashion. The application range of the known process extends, beyond sintered porous materials, to tools made of heavy solid materials such as steel, aluminum, copper or other alloys. One advantage of the known process is seen in its prevention of locally occurring temperature peaks, which allows reducing cycling times and molded piece defects. The known process is characterized by the fact that pressurized carbon dioxide is, through a feeding system, directed to appropriate tool areas so as to cool these areas by a localized expansion of the carbon dioxide. The preferred tool areas are those where, owing to excessive tool temperatures, shiny spots or shining differences appear on the plastic articles, sagging points occur, deformation occasions problems or where generally excessive and/or tool damaging temperatures may arise. The feeding of compressed carbon dioxide occurs through tiny tubes or flexible hoses. Upon exiting from these feeding tubes, the compressed carbon dioxide expands, thus drawing off heat from the surrounding material. Due to the after-flowing carbon dioxide, the expanded gas is moved through the gap between the feeding tubes and the walls of the expansion chamber out of the tool, so as to enable it to escape into the atmosphere, be captured by a special system and subsequently re-processed.
[0003] Apart from this surface-wide tool cooling, a water-jetting type cooling is known.
The process is based on an open or closed cooling water system, where the tool is provided with flow channels conformed to appropriately fit the processing conditions and the geometry of the work-piece and the tool. This makes it possible to efficiently cool the tool and the injected masses and to substantially reduce the cycling times.
However, the use of water as a coolant can lead to calcium scaling deposits in the flow channels, thus lowering the cooling effect. In the worst cases, channel plugging and total ineffectiveness of the cooling system may occur. Another already known solution is described in German Patent Document DE 102 56 036 Al as a tool cooling process and device based on the carbon dioxide expansion cooling principle.
The known device is characterized by a plurality of boreholes, each of which is penetrated by a capillary tube open at its free extremity. The capillaries are connected with a gas-feeding collection tube, and the boreholes with a gas-collection channel for a gas return loop. However, this known solution fails to indicate how a large number of cooling points, which may possibly also be arranged in a locally distributed manner, may be supplied with a coolant efficiently and with adequate assurance, because a simple parallel arrangement of the capillaries cannot satisfy these requirements.
[0004] The task thus resulting for the invention is to create a tool cooling system of the kind mentioned at the beginning, to be distinguished by an improved feeding of the coolant to the cooling points in the form of its distribution, thus leading to enhanced manufacturing process efficiency and better product quality.
Summary of the Invention [0005] In accordance with the teaching of the principal claim, the task is solved by a coolant distribution to the cooling points that consists of a capillary tube connected to a feeding loop and an expansion chamber fitted with a capillary tube inlet and connected to a return loop, so as to allow a coolant conveyed to the cooling points in a liquid state to evaporate and be carried off as a gas. For this purpose, a hermetically sealed distribution block attachable to a coolant source and a coolant sump is fitted with coolant channels carved out in at least one plane and formed to be capable of being attached to a tool. The coolant channels are formed as feeding loops branching out to the cooling points, and as return loops connecting the cooling points to a collector. The coolant feeding occurs from the coolant source to the feeding loops through a hose which is attached to an inlet formed as a hose coupling, and through at least one magnetic switching unit inserted after the inlet. The coolant discharge from the return loop collector occurs through a hose leading to the coolant sump, while the outlet of the return collector is formed as a hose coupling to which the hose is attached.
[0006] Advantageous improvements and configurations are given in the subordinate claims. The invention is characterized by embodiments of the coolant channels that are adaptable to various applications. In a first advantageous embodiment of the invention, the coolant channels are boreholes inserted into the distribution block, which lead to the cooling points through crossings forming junction points and/or directly to the cooling points, and are hermetically sealed toward the outside. In another advantageous embodiment of the invention, the distribution block is made of at least two plates and the coolant channels are formed as groove-like recesses in at least one plate and covered by another plate. In another advantageous embodiment, the coolant channels are realized so that groove-like recesses are carved out in the distribution block, in which the coolant carrying tubes are irremovably disposed. The invention is further improved by attaching at least one magnetic switching unit to the feeding loop, using plug-in connections. The object of the invention further consists in the fact that the capillary tube is fastened to a connecting element fitted with an inlet and outlet, so that the capillary tube is tightly connected by the inlet to the feeding loop, and the expansion chamber is tightly connected by the outlet to the return loop.
The invention is advantageously implemented by shaping the connecting element so as to enable it to be plugged into a supporting bushing set into the distribution block.
Brief Description of the Drawings [0007] The characteristics of the invention will in the following be explained in greater detail with the aid of drawings, which show:

In Fig. 1 a preferred for of embodiment of the invention, and In Fig. 2 a cooling point of the preferred form of embodiment.
Detailed Description [0008] Fig. 1 illustrates a simplified top view of a plate 1 fitted with coolant channels 3, 31, 4, 41 of a distributing block according to an aspect of the invention, as well as a simplified cross-section through the distribution block supplemented with a cover plate 11. The plate 1 carries coolant channels 3, 31, 4, 41 milled into a first plane so that the feeding loops 31 are leading to all cooling points, and the return channels away from them. In laying out the looping system, care must be taken to consider the positions of the releasing pins 7 next to the cooling points, so that the looping paths can be provided with corresponding arcs. For ease of illustration, the coolant channels 3, 31, 4, 41 are shown in the drawings as having corners; in practice the coolant channels 3, 31, 4, 41 would not include abrupt angles but rather curves with technically more favorable flow characteristics. The return loops 41 are joined in a collection conduit 4 leading to a hose coupling 42 through which, as well as through a hose 421 attached to the same, a coolant return flow can occur to the coolant sump, for instance a compressor inlet. By using an underpass 8, which may advantageously be formed as a stamped bridge-like element, the collection conduit 4 crosses a feeding loop 31. The feeding loops 31 represent extensions of an inlet feeding loop 3, where the inlet feeding loop 3 is led to two magnetic switching units 2, each of which is fitted with a magnetic switch 21 from which the feeding loops 31 are further branched off to the cooling points 6. The magnetic switches 21 are advantageously inserted into the feeding loops 31 with plug-in connectors 5. The inlet feeding loop 3 is connected to a hose coupling 32 connected to a hose 321. The hose 321 leads to a coolant source, for instance the outlet of a compressor. A liquid coolant flows from the coolant source, through the hose 321, the hose coupling 32, the inlet feeding loop 3, the magnetic switch 21 and the feeding loops 31 to the cooling points 6, which will be described in detail with the aid of Fig. 2. The coolant evaporates in the expansion chambers 65 of the cooling points 6, becomes gaseous, and is conveyed through the return loops 41, the collection conduit 4, the hose coupling 42 and the hose 421 to the coolant sump to be re-liquefied, so as to form a cooling block hermetically sealed by the second plate 11 and fitted with an internal coolant channel network and an inlet and outlet coupling, which can be connected to a plastic material forming tool by suitable devices.
[0009] Fig. 2 illustrates a single cooling point 6 with a capillary tube 64 flowing into an expansion chamber 65. The capillary tube 64 is fastened to a connecting element 62 provided with two connectors 641, 651. The first connector 641 sealingly connects the capillary tube 64 to the feeding loop 31. The second connector 651 sealingly connects the expansion chamber 65 to the return loop 41. The connecting element 62 is fitted, through openings in the connectors 641, 651 and suitably arranged gasket elements 63, in a geometrically and force-induced plug-in manner, into a supporting bushing 61 correspondingly arranged in the plate 1.

Claims (7)

1. Coolant distribution system for the cooling of a tool through cooling points (6) that consists of a capillary tube (64) connected to a feeding loop (31) and an expansion chamber (65) connected to a return loop (41) into which the outlet of the capillary tube (94) opens so that a coolant conveyed in a liquid state to the cooling points (6) evaporates and is drawn off as a gas, characterized by the fact that a hermetically sealed distribution block (1, 11) attachable to a coolant source and a coolant sump is fitted with coolant channels (3, 31, 4, 41) carved out in at least one plane and conformed to be attachable to a tool by a flange, the coolant channels (3, 31, 4, 41) are conformed as feeding loops (3, 31) branching out to the cooling points (6) and as return loops (41) leaving the cooling points (6) to be joined in a collective conduit (4), the coolant feed occurs from the coolant source to the feeding loops (3, 31) through a first hose (321) attached to an inlet conformed as a hose coupling (32) and at least one magnetic switching unit (2) mounted after the inlet, and the coolant discharge occurs from the collective return conduit (4) through a second hose (421) to the coolant sump, where the outlet of the collective return conduit (4) is conformed as a hose coupling (42) to which the second hose (421) is attached.
2. Coolant distribution system according to claim 1, characterized by the fact that the coolant channels (3, 31, 4, 41) are boreholes introduced into the distribution block (1), which lead to crossings forming connecting points and/or directly to the cooling points (6), and are hermetically sealed toward the outside.
3. Coolant distribution system according to claim 1, characterized by the fact that the distribution block (1, 11) consists of at least two plates and the coolant channels (3, 31, 4, 41) and are conformed in at least one plate (1) as groove-like recesses and covered by another plate (11).
4. Coolant distribution system according to claim 1, characterized by the fact that the coolant channels (3, 31, 4, 41) are realized so that grove-like recesses are carved out in the distribution block (1), in which the tubes conveying the coolant are set in an irremovable manner.
5. Coolant distribution system according to any one of claims 1, 2, 3 or 4, characterized by the fact that at least one magnetic switching unit (2) is attached to the feeding loop (3, 31) by plug-in connectors (5).
6. Coolant distribution system according to any one of claims 1, 2, 3, 4 or 5, characterized by the fact that the capillary tube (64) is fastened to a connecting element (62) with an inlet and an outlet, so that the capillary tube (64) is tightly connected to the feeding loop (31) by the inlet, and the expansion chamber (65) is tightly connected to the return loop (41) by the outlet.
7. Coolant distribution system according to claim 6, characterized by the fact that the connecting element (62) is conformed as a supporting bushing (61) set in the distribution block in a plug-in manner.
CA2716902A 2008-02-29 2009-02-27 Coolant distribution for tool cooling Expired - Fee Related CA2716902C (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE102008000452A DE102008000452A1 (en) 2008-02-29 2008-02-29 Coolant distribution for tool cooling
DE102008000452.9 2008-02-29
PCT/EP2009/052340 WO2009106601A1 (en) 2008-02-29 2009-02-27 Coolant distribution for cooling a tool

Publications (2)

Publication Number Publication Date
CA2716902A1 CA2716902A1 (en) 2009-09-03
CA2716902C true CA2716902C (en) 2012-07-10

Family

ID=40765452

Family Applications (1)

Application Number Title Priority Date Filing Date
CA2716902A Expired - Fee Related CA2716902C (en) 2008-02-29 2009-02-27 Coolant distribution for tool cooling

Country Status (11)

Country Link
US (1) US20110005729A1 (en)
EP (1) EP2282880B1 (en)
KR (1) KR20100126756A (en)
CN (1) CN101959661B (en)
AT (1) ATE531497T1 (en)
BR (1) BRPI0908413A2 (en)
CA (1) CA2716902C (en)
DE (1) DE102008000452A1 (en)
PL (1) PL2282880T3 (en)
PT (1) PT2282880E (en)
WO (1) WO2009106601A1 (en)

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US20130295219A1 (en) * 2012-05-02 2013-11-07 Ralph Edwin Neufarth Injection Mold Having a Simplified Evaporative Cooling System or a Simplified Cooling System with Exotic Cooling Fluids
AU2013222278A1 (en) 2012-02-24 2014-09-11 The Procter & Gamble Company Injection mold having a simplified cooling system
DE102012104263A1 (en) 2012-05-16 2013-11-21 Walter Maschinenbau Gmbh Coolant distributor for a machine tool
EP2781334A1 (en) 2013-03-22 2014-09-24 Viko Elektrik Ve Elektronik Endustrisi Sanayi Ve Ticaret Anonim Sirketi Mould cooling pin for the narrow and long domes of the injection moulds
DE102013016453A1 (en) * 2013-10-02 2015-04-02 Isk Iserlohner Kunststofftechnologie Gmbh Method and device for producing a component in a molding process and component
GB201418175D0 (en) * 2014-10-14 2014-11-26 Pilkington Group Ltd An apparatus and a process for grinding an edge and a glazing having a ground edge
CN105818344A (en) * 2016-04-26 2016-08-03 芜湖市万华塑料制品有限公司 Temperature controllable injection mould used for insulation frameworks
EP3524403A1 (en) * 2018-02-13 2019-08-14 G. A. Röders GmbH & Co. KG Druck- & Spritzguss Device and method for cooling a casting mould
CN113320077B (en) * 2021-05-20 2022-08-02 青岛海佰利机械有限公司 Cooling assembly, cooling process, injection molding machine and injection molding process
CN114536094B (en) * 2022-01-26 2023-03-14 中国航空制造技术研究院 Built-in cooling system
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KR102445542B1 (en) * 2022-06-30 2022-09-21 주식회사 한울플라텍 Cooling device of mold for pressure forming system

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Also Published As

Publication number Publication date
CN101959661A (en) 2011-01-26
PL2282880T3 (en) 2012-03-30
BRPI0908413A2 (en) 2018-01-09
CN101959661B (en) 2013-11-13
WO2009106601A1 (en) 2009-09-03
CA2716902A1 (en) 2009-09-03
EP2282880B1 (en) 2011-11-02
DE102008000452A1 (en) 2009-09-03
KR20100126756A (en) 2010-12-02
ATE531497T1 (en) 2011-11-15
US20110005729A1 (en) 2011-01-13
EP2282880A1 (en) 2011-02-16
PT2282880E (en) 2012-02-03

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Effective date: 20170227