注塑模具毕业设计说明书(6)

天津职业技术师范大学2011届本科生毕业设计

increment to fill, add what additive to select by examinations suitable molding tool material. For example: Creating shape is greatly complicated, medium-sized precise plastics product, its molding tool material can choose to prepare hard model to anticipate a molding tool of steel; Time of the manufacturing complications, nicety and production is longer and need the high life span molding tool every moment adopt time limited efficacy hard to model to anticipate a molding tool steel. Mainly still need to aim at material and molding tool of plastics product to anticipate an usage circumstance while concretely choosing selection. The feat material pluses a reasonable design to use a tremendous exaltation molding tool period, can raise product quality in the meantime as well

The plastics processing industry moderates plastics to model a machine kit and gives the plastics the tool that the product reaches type and accurate size by integrity. Because plastics species and process a method to are of a great variety, the plastics models the structure of machine and plastics product again over-elaboration different, so, category and structure of plastics molding tool are also varied.

Categorize a plastics molding tool to press the modeling of plastics characteristic to is divided into hot solid sex plastics molding tool and hot Su plastics molding tool two major type; It is 6 major types to press to model a craft to is divided into to press a Su mold, spread a Su mold, note a Su mold and blow Su mold, the mold of Zhu Su and heat to model mold etc.. Pressing a Su mold can press to overflow to anticipate a way to is divided into an overflow type, half overflow type again, not the overflow type is 3 types, it is 2 types to can also press to pack to unload a way to is divided into to move type and fixed type. Note the Su mold can press to sprinkle to note system to be divided into again cold flow a mold and heat to flow a mold of 2 types. Crowded Su mold calls to push a Su mold head again, different from other molding tools, it decides perpendicularity in anticipate to flow a direction of product size and it horizontal piece noodles shape, all another become system in principle in the structure and the design.

Design a main factor molding tool the design and manufacturing and plastics process germane. The success or failure that the plastics processes, to a great extent that be decided by a molding tool design effect and molding tool manufacturing quality, but the plastics molding tool design again with correct plastics product design for foundation. The structure main factor that the plastics molding tool design wants to consider has:①Cent type noodles, namely cave mold for molding tool to shut match and convex mold match with mutually of contact surface. Its position and form make selection and is subjected to product shape and external appearance, thick wall, model a method and process craft, molding tool type and structure and take off a mold method and model the influence of machine structure etc. factor behind.②Sprinkle to note system, namely from note Su machine and spray a mouth to the of type chamber of entering and anticipating passage, including essential way, reposition of redundant

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天津职业技术师范大学2011届本科生毕业设计

personnel way, sprinkle with cold anticipate cave. Especially sprinkling making selection of a people's position should be advantageous to meltdown plastics the been full of chamber is under the good fluxion appearance and attach flow a way and sprinkle a people in the solid on the product cold anticipate to be easy to from the crest in the molding tool while mold of and give clearance.(hot flow a mold excepted)③Various factors of the plastics constringency rate and the influence product size accuracy wear away such as the molding tool manufacturing and assemble error margin, molding tool etc.. In addition, when the design presses a Su mold and notes a Su mold should also consider the matching of craft and structure parameter that models machine. Design in the plastics molding tool in already extensively applied calculator assistance design technique.

Structure and basic spare parts blow the structure that the Su mold, the mold of Zhu Su and heat model a mold simplest. Press a Su mold and note a Su mold and spread a Su mold the structure is more complicated and constitute the spare parts of this molding tool also more. The basic spare parts has:①Model spare parts, including cave mold, convex mold, various model Core, all is model inside the product, outward appearance noodles or up, next carry noodles, side bore and side cave with thread of spare parts.②Pay to accept to fix spare parts, include a mold plank, fixed plank, pay to accept plank, and mat piece...etc., in order to fix molding tool or to accept pressure.③Lead to spare parts, include to lead pillar and lead a set, in order to make sure a molding tool or release the opposite position of organization sport.④Take out Core spare parts, include inclined sell, slippery piece of etc., in order to draw out a Core when the molding tool opens, make the product taken off a mold.⑤Release spare parts, include to push a pole, push a tube, push a piece, push a plank, push a wreath, push the pole fixed plank and push plank etc., in order to make the product taken off a mold. Note a Su mold much the expansion adopts a standard molding, this kind of is the basic spare parts that is all had already standardized to turn with series by structure, form and sizes the set combine, its mold chamber can process by oneself according to the product shape. Adopt a standard mold to be advantageous to short to make a mold period.

All want heating while using a hot solid sex plastics molding tool to use. The common use heating method is an electricity heating method, will soon give or get an electric shock a hot component to inset in the heating plank, or make into the electricity hot turn of different shape the assemble is in the molding tool surface. Molding tool's heating should be even, and prevent from hot conduction and radiation loss in response to the heat preservation. The plastics species processed is different, the molding tool temperature (namely process temperature) is also different.

Hot Su plastics molding tools all want cooling. Especially in the middle of noting a Su craft, the molding tool cools off the Chong mold of the direct influences plastics and the already set of the product and also directly influence to note Su period and product quality thus. The in common use hot Su

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天津职业技术师范大学2011届本科生毕业设计

plastics processes temperature and molding tool to cool off temperature to see table 2.The molding tool cools off to adopt piping water cooling method more and drills a hole on the molding tool or the template and imbed a copper tube's with cold water. For thin long type the cooling of the Core, can also adopt to transmit heat a pole cooling method, drill a hole in the Core in the type, and imbed metal to transmit heat a pole to lead its calories of. Cooling off the waterway should set up even. Cooling off water should soften and keep the wall knot in the waterway from dirt but lose cooling effect.

The life span of the molding tool is material plastics molding tool, in addition to being decided by a molding tool structure design, and molding tool usage and maintenance condition outside, mainly still lie in whether the molding tool material basic function adapts to a molding tool manufacturing request and usage condition. Therefore, reasonable choice molding tool material should with molding tool structure and use a condition for basis. The molding tool material regards steel material as principle, but processes a craft condition according to the plastics, can also adopt low melting point metal alloy, low die-casting aluminum metal alloy, Pi copper and other nonmetal materials, like epoxy, and gypsum...etc..

Making the mold steel material should have a good machine to process function, the hot processing transforms behind small, throwing light the function is good and bear to whet, bear corrosion, high strength. The in common use species has carbon the plain structure steel, the carbon plain tool steel and metal alloy tool the steel and metal alloy structure steel etc..

The plastics molding tool can is divided into according to total function structure: guidance system ﹑ accept system ﹑ to model spare parts system the ﹑ sprinkle to note the system ﹑ cooling system ﹑ a crest the system ﹑ row spirit system.

Move mold part to include is to move template module, prop up a piece, prop up plank and release organization and crest pole to release system. Like this design of move a mold part of and the most basic molding tool structure in of move mold part homology.

The molding tool opens a mold in proper order: Floated chamber plank and settle template first separate, ensure that the molding tool sprinkled to note system Cod to anticipate immediately take off from hand over a people set while. In order to carry out sequence like this, settle of template and floated chamber plank to have spring coil. The elasticity of spring coil has to be enough big to start the function bottom floated chamber plank of pushing the dint and move mold part by ensuring in the together exercise. The spring coil set together packs a class in leading pillar the homologous spring coil is at the floated chamber plank, this kind of form assembles in the spring coil in very familiar.

The main part that sprinkles to note system sets up in settling template and operates for easy to auto, the reposition of redundant personnel way should adopt trapezoid to cut noodles, in order to in take off to sprinkle to note system Cod to anticipate. Notice, if adopt a circular reposition of redundant personnel

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天津职业技术师范大学2011届本科生毕业设计

way, the half of reposition of redundant personnel way sets up on the floated chamber plank, the reposition of redundant personnel way may stay on the floated chamber plank while a mold, the bar Cod anticipate of shed off or clean.

We will cautiously discuss the structure of molding tool now. Sprinkle to note system

In the plastics molding tool, conjunction's noting the fluxion passage that the Su machine sprays a mouth and elder brother type chamber is very necessary, this kind of enters to anticipate passage to call to sprinkle to note system. Sprinkle to note system from the essential way, reposition of redundant personnel way and sprinkle to constitute usually.

Definition: molding tool in from inject machine to spray a mouth to start a type chamber of the plastics flow passage. It from essential way ﹑ reposition of redundant personnel way the ﹑ sprinkle and Ling to anticipate cave to constitute.

(A).Essential way:

1. Definition: the essential way means from inject the part that the machine sprays a mouth and molding tool contact to rise, arrive reposition of redundant personnel way of the segment.

2. Design the last regulation:

(1).The essential way carries noodles shape usually for the circular. (2).For easy to take off a mold, the essential way general creations all take gradient, but if must notice the gradient of each a piece of piece of son last bore and the size of the bore when the essential way wears excessive piece of plank son in the meantime.

(3).The design of essential way size wants to settle according to the fluxion characteristic of plastics material

(4).The essential way mostly adopts a cone form on the design.(If the diagram shows)creation want to notice:

A. Small carry diameter of D 2= Ds 1+s (0.5~1 mms) B. Small carry radius of R 2= R s 1+s (1~2 mms)

(Among them the D1 ﹑ R1 difference for inject the diameter of machine projection and inject the radius of head)

3. Sprinkle a people's set

Because the essential way wants and heat plastics and spray mouth contact and collision, so the essential way of the molding tool part usually designs into the Chen set that can dismantle to unload to replace, the brief name sprinkles to note a set or sprinkles a people's set

(1).Its function mainly is:

A. Get into fixed position bore while making the molding tool installed convenience but is noting Su to nicely position and note Su machine to spray mouth bore to fit together on board, and can experience the anti- pressure of plastics, unlikely is released a molding tool

B. As the essential way that sprinkles to note system, will anticipate the plastics in the tube to transfer a molding tool, promise to anticipate to flow

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天津职业技术师范大学2011届本科生毕业设计

an emollient arrived chamber, in the process of injecting in should not there is plastics spillage, promise in the meantime that the essential way Cod anticipates to take off a convenience.

(2)The structure form has whole type and cent the body type

Whole type: namely set shoulder and constitute an essential way to partially make into integral whole

Divide a body type: namely set shoulder and constitute an essential way to partially and separately create

The industrial standard of Japan: JIS The industrial standard of China: SJB

(Two).Reposition of redundant personnel way:

Definition: essential way with sprinkle 1 of , it is a meltdown plastics is been also the transition segment that sprinkles to note to pass cross section area in the system variety and plastics to change direction by the transition segment of essential way inflow type chamber, can make the plastics got a steady conversion.

1. Cut a noodles design

A. General cuts the noodles as circular

B. From processed convenience to see the general design as U form, V form, trapezoid, positive hexagon

C. The cross section shape and size of reposition of redundant personnel way should model a physical volume according to the Su piece, Su piece the wall is thick, Su piece shape, the plastics craft characteristic used, inject velocity, reposition of redundant personnel way length etc. factor to make sure.

2. The decoration form of reposition of redundant personnel way has an equilibrium type to enter to anticipate and the not- equilibrium type enter to anticipate two kinds of forms. The equilibrium type enters to anticipate be promise each enter anticipate in the meantime enter anticipate, not- equilibrium type enter anticipate be each enter anticipate can not in the meantime balanced enter anticipate, generally want to do a mold to flow analysis to carry on valuation.

(Three).Sprinkle

1. Definition: sprinkle and call into anticipate or inside flow a way. It is the narrow part of reposition of redundant personnel way and Su piece and also call to sprinkle to note the shortest and small part in system;

2. Function: can make the current velocity creation of the reposition of redundant personnel way meltdown plastics that loses to deliver acceleration, formation ideal of flow Tai, in proper order, and soon soon been full of chamber, still have in the meantime closing type the chamber keeps Hot from anticipating flowing back of function, and easy to make to sprinkle and Su piece after modeling of separation.

3. Sprinkle an form:

The seamy side sprinkles

The common side sprinkles: (the edge sprinkles)

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