Plastic handle injection mold design

2013-07-04 16:00:09

Text / Bowen Feng Kang Zhijun Wang Xiang

Abstract This paper describes the design of plastic injection mold process handle, plastic handle on each side of a row of bayonet, internal needs molding two hollow cylinder and a card in the shape is more complex. Design, through a small core plus slider way to forming sides of the bayonet, and the card is used to slide the inner core pulling inclined to complete. The paper side of the mold core pulling and other parts of the analysis and design.

Keywords · Mold Design Plastic handle Pulling the slider

Abstract: This article introduced the design process of injection mould for plastic handle. Two sides have a row of bayonet sockets, the interior also needs to take shape two center spatial circular cylinders and a clip, and the shape iS very complex. Small cores are used by taking shape two rows of

bayonet sockets to design. And the slanting slide inside are used to pullout the core organization in order to complete shaping the clip. In the article the analysis and the design are done which mainly about the side to the mold pulls out the core organization and so on.

Keywords: Mould design Plastic handle Gliding block Loose core

Plastic handle structural process analysis

With the design of the first to examine the shape and structure of plastic parts, mold design when considering how best to ensure the plastic parts of the shape and structure. Plastic parts shown in Figure 1 as a whole in an arc, the radius of 500mm. There are two internal intermediate hollow lOmm 12mm diameter cylinder. Inside there is a clip below. Handle on each side of a row of five bayonet, bayonet size is 4 * 7mm, deep is 2mm. Handle thickness above 2.5mm,

Both sides of the wall thickness of 1.5mm, more complex shape.

Plastic parts of the complex structure, asymmetry, and to ensure the smoothness of the surface, so that the upper surface into the cavity, and to enable the injection pressure distribution will be placed in the center of one side of the cavity, the gate discharge In the off-center side of the core parts of the pump placed on both sides,

Shown in Figure 2.

Parting selection

According to the shape of the plastic parts structure to determine the position of the parting of the curved plastic parts into a whole, and to ensure that its upper surface a certain degree of smoothness, its two side also have a row of tabs will therefore genotyping plane as the upper surface and a position between the tabs, and is curved, as shown in Figure 3.

Selected such that the parting surface has the following advantages:

(1) so that products remain in the movable mold side, is conducive to mold institutional settings;

(2) help to ensure dimensional accuracy of products;

(3) help ensure product appearance.

(4) in favor of the exhaust.

(5) will help simplify mold structure

(6) in favor of the mold cavity machining direction and products.

The structural design of the die

The die used to form the contour of plastic parts, according to the structure can be divided into the overall style, the overall embedded, modular and flap fit mosaic of four.

Because the shape of the plastic parts, and the use of one cavity, the use of the die by the integral die. Integral materials processing die is made from a single piece, characterized by high strength and stiffness, no traces of the products to a seam, the injection mold can reduce the number of molded parts, easy to mold assembly, the shape of the mold and the narrow structure size. But the processing more difficult, need to use profiling milling, CNC machining or EDM machining, heat treatment is not easy.

Punches and core structural design

Taking into account the complex structure of plastic parts, using mosaic modular punch. Also forming bayonet sides, need to use the slider, forming the core punch dwelling core design that processing a small core of plastic parts are molded interior, exterior combined with a small core to core molding plastic parts the two sides, and is convenient for movement of the slide, as shown in Figure 4.

Plastic cards in a row on each side of the mouth, in order to shape the bayonet, both sides of the core using the slider, the slider 10 on the basis of a small processing cores, with the fastening screws and slide the small core connected together for molding plastic parts on both sides of the bayonet shown in Figure 5.

There are two hollow plastic parts inside the hole and a clip, you need a small core, based on three core reprocessing to ensure accurate molding hole and clamp.

Choice of standard mold

Plastic injection mold work has two national standards, namely GB/T12556.1-90 ≮ small plastic injection mold mold and technical conditions "and GB/T12555.1-90

"Large plastic injection mold mold." This is an important difference between the two standards that apply to different scopes before A2-250400-60-21. Screws and rectangular springs, making the mold clamping's template size BxL ≤ 560mm × well when the slider sliding.

900mm, while the latter template size BxL as side core mechanism design

630mm × 630mm-1250mm × 2000mm. The design of plastic parts for the handle, the overall structure of the plastic mold

The design used for small and medium mold. Pieces in a row on each side of the bayonet, in order to shape this design choice is A2 type, according to these bayonet, require the application of side core machine mold the overall structure shown in Figure 7,8,9, "the amount of mold design concise knife Manual "in the table structure shown in Figure 6. When the mold side core 10.

3-19 and Table 3-97, selected models with external mold set bezel, the bezel on the use of

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