Egg mixer handle color injection mold design

 

    (Zhejiang Textile & Fashion College, Ningbo, Zhejiang 315211)

 

Abstract: The egg mixer handle color injection mold structure, design elements and work process, detailing the die casting system design, the use of composite Hough institutions and oblique lifter inner core agencies, in order to achieve a color mold parting movements. Practice shows that the mold structure, reliable, stable and smooth movement, precision and appearance quality products are in line with requirements.

 

Keywords: color mold; handle; casting system; composite Huff institutions; lifter; core pulling; sequence typing

 

CLC: TG241; TQ320 Document code: B Article ID :1001-2168 (2012) 06-0042-04

 

1 Introduction

 

    For a long time, by the cost and equipment constraints, the domestic production of color often used products 2 separate process for injection, main injection molded article which is to remove the product main body and then through another pair of mold package material injection molding. The injection process is not high degree of automation, production efficiency is low, seriously affecting the economic benefits. With the production process of continuous innovation, enterprise attaches great importance to product quality and production capacity, paying attention to color injection molding production process and manufacturing technology, which improve the competitiveness of enterprises of great significance.

 

2 Products Process Analysis

 

    Figure 1 egg mixer handle, the external dimensions of wars 8mm ×. Jealous 5 mm × 148.5 mm, the overall quality of 49.9 g, average wall thickness of 2.3 mm, the main material is ABS. To improve the appearance of the system and comply with crystal texture products switch keypad (see Figure 1A district) and hand contact area (Figure 1B area) with PVC soft plastic.

 

    For ease of installation switches, switch-in-progress design area outside with tact hole bosses; as ergonomic, palm area products designed concave structure. The products are daily necessities, the appearance of higher, and to ensure that its subject is not easy to disengage with soft plastic parts, die life of 30 million times.

 

3 die structure

 

    Products slender shape, for ease of feeding and cooling, will be placed in a vertical cavity molding products to keep up with the direction parallel to the mold using Hough structure outer surface of molded articles. Products subject slider shape with fixed mold molding, switching area will adopt the movable mold lifter molding, hand molding area is used Neiha Fu slider. Region of the mold products and materials shown in Figure 2, the stationary die 2 and the oblique slide pusher (1) for implementing the two-color molded article switching section. For ease of molding and mold cavity machining assembly, the internal structure of a large mosaic of small Huff Huff inserts three palm area in order to achieve two-color molding products.

 

4 Die design elements

 

    According to the structure and technical requirements of the handle, the handle body and the soft PVC plastic region 2 is designed to separate from the mold and the semi-finished molding, two movable mold between the mold and the fixed mold must be able to cooperate with each other, and the two dynamic model the same structure, but the fixed mold structure is different, each with its own gating system and melt-filled areas. Cooling the mold using the well, installation of impermeable intermediate plate, so that the level of the core region can be cooled to maximize the cooling zone to maintain the balance of the cooling.

 

4.1 gating system design

 

To ensure the quality of products, the use of CAE software for the melt flow, mold cooling system balance and control products Weld detailed analysis of feasibility studies, design a reasonable position and poured into the cooling system, shorten product cycle times, reduce product scrap rate.

 

Color injection mold design, injection products generated when the main gate automatic condensate material must be able to emerge, no follow-up process to remove, or products PVC melt injection elbow can not automated production. Products, semi-finished casting system are provided in the mold and finished mold core inserts on the given model, where semi-finished mold using spider. 5 mm point gate located directly on the products, flow channel side slope is 2. , The gate height of 62 mm, the casting system structure shown in Figure 3 (a) in Fig.

 

    Products PVC melt cavity by the switching area and palm area two parts, two separate, disconnected, you must design two gates, where products palm area design spider. 5 mm point gate on the products; product area due to the special position of the switch, you can not directly use the feed point gate, so designed as side feed mode, the gating system structure shown in Figure 3 (b) below. After the mold casting system changes in the gate junction (Figure 3 (b "parting off, leaving the gate on the products slug in progress need to manually remove the top of the post.

 

4.2 mold core pulling mechanism design

 

4.2.1 fixed mold core pulling mechanism

 

    Products switch area with bosses and through-hole, so a bevel pillar core pulling the slider, the slider 2 can play a guiding role in the mosaic of large Huff block 3, the structure shown in Figure 4. After the mold Bevel column does not move downward slide 2, prolapse products bosses and through-hole, complete products switch region typing.

 

4.2.2 Release institutions lifter

 

    PVC injection molding melt, because the need for installing the switch, the switch has two concave wall characteristics, so the design implementation of the lifter pushing mechanism type shown in Figure 5.

 

4.2.3 Composite Huff institutions

 

    According to product structure, composite Hough mechanism (see Figure 6) molded article, wherein the article form using a large block 2 Hough molding. To meet the requirements of two-color injection products, products palm area through the small block of 3 Huff Huff embedded in large blocks of two up molding.

 

5 die working process

 

    Products with the structure and technical requirements, semi-finished mold, and the mold cavity die 1 are used in the form 1, the overall structure of the mold to the mold center as the origin arranged symmetrically constructed using Hough the cavity structure shown in Figure 7.

 

    Die working process: semi-mold injection is completed, move under the action of the injection molding machine, the fixed mold mold, and then the stopper and the stopper block 2 under the action of lock 7 to achieve sub-surface 1 type, fixed plate 10 9 Open and dynamic template, moving, set the template separation and promote small slider 8 and the fixed mold Bevel column 6 relative motion, the completion of eight pairs of small slider switch area products Pulling actions; continue to mold, pull plate 15 and Limit Lock 14 collision parting II typing, moving platen 9 is separated from the support plate 16, and retractors five acts on Huff slider 20, the spring 19 in a supporting role to achieve Huff slider Pulling; moving platen and the movable mold support plate separated a certain distance of the stopper rod 22 under the limit, move, scheduled to die parting achieve gate slug ejection (this time it did not offer semi-finished); Then the movable mold side of the injection molding machine Back to the turntable rotation 180. , After clamping PVC melt injection, PVC melt injection is completed, repeat semi-mold process, and then spread through the injection molding machine plunger movable support plate 16 movement, to achieve parting III, mold, lifter 4 movement along the guide block 3 and the introduction of plastic parts, plastic parts and then remove the sprue slug; injection molding machine and then again back to the turntable rotates 180. , Driven lifter guide slider 3 4 first reset, move, scheduled to die mold, completed a two-color injection molding cycle.

 

6 Conclusion

 

    Through the handle color injection mold design, analysis of the main products of PVC plastic molds and die casting system characteristics, and designed according to the structural characteristics of products, reasonable gating system, while the use of composite structure and the lifter Huff core pulling mechanism to achieve the color mold parting action sequence. Practice shows that the mold structure, reliable, stable and smooth movement, accuracy and appearance of products to meet the requirements to achieve an efficient, high-quality color products production.