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The common structure of the placement machine

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The common structure of the placement machine

Date:2018-03-15 Author:admin Click:


At present, the placement machine structure can be roughly divided into four kinds of structures: arch type, compound type, turret type, and large parallel system.


(1) Arch type. Arched machines are the most traditional placement machines, with good flexibility and accuracy, suitable for most components, high-precision machines are generally this type, but its speed can not be combined, turret and large Compared to parallel systems. However, the component arrangement is increasingly concentrated on active components such as leaded QFPs (Quadflat PACkages) and BGAs (Ball Grid Arrays), and the mounting accuracy plays an important role in high output. . Composite, turret, and large parallel systems are generally not suitable for this type of component installation. The arch-type machines are divided into single-arm type and multi-arm type. The single-arm type is the first multi-functional placement machine that is still being developed. The multi-arm placement machine developed on the basis of single-arm type can double the working efficiency. For example, the Panasonic CM602 SMT machine has 4 boom mounting heads, which can alternate 2 PCBs respectively. Circuit Boards (Printed Circuit Boards) are installed at the same time, and the mounting speed is up to 60,000 pieces per hour. The structure of the boom-type machine is shown in Figure 1. Most of the placement machine manufacturers have introduced high-precision placement machines and medium-speed placement machines using this structure, such as the AC72 of Universal, the CM402/CM602 of Panasonic, the AQ-1 of Assembleon, and the Hitachi Company. TIM-x, Fuii OP-341E and XP series, Panasonic BM221, Samsung (2P60 series, Yamaha YV series, Juki KE series, Mirae MPS series).


(2) compound type. The compound machine was developed from a gantry type machine. It combines the characteristics of turret type and arch type. A turntable is mounted on the boom, like Siemens' Siplace80S series placement machine, with two sets of 12 The nozzle of the rotating head, as shown in Figure 2. Universal also introduced a rotating head with 30 suction nozzles, called "lightning heads." Two such rotating heads are mounted on the Gene-sis patch platform and can achieve 60,000 patch speeds per hour. Strictly speaking, hybrid machines still belong to the boom structure. Because the compound machine can increase the speed by increasing the number of booms, it has greater flexibility, so its development prospects are optimistic. For example, the latest GCl20 machine launched by Universal has installed four "lightning heads" at a high mounting speed. 120,000 tablets/h.


(3) turret type. The concept of the turret is to use a set of moving feeders, from which the turret draws the components, and then places the components on top of the circuit board on the moving workbench. The structure is shown in Figure 3. The turret-type machine has significantly increased the speed of placement due to the simultaneous pick-up elements and patch action. The application of this type of high-speed placement machine in China is also very common. Not only is it fast, but the development technology after more than ten years is very mature. For example, the Fujifilm CP842E machine placement speed can reach 0.068 s/piece. However, due to the limited mechanical structure of this machine, its placement speed has reached a limit, and it is impossible to significantly increase it. The downside of this model is that it can only handle strips.

The turret-type machine is mainly used in the production of large-scale computer board cards, mobile phones, home appliances and other products. This is because of these products, 15 with a large number of components and high assembly density, it is suitable for this model. in production. A considerable number of Taiwanese-funded, Hong Kong-owned electronics assembly companies and domestic electrical appliance manufacturers have adopted this model to meet the requirements of high-speed assembly. Manufacturers of turret-type machines _Feng must have Panasonic, Hitachi, Fuji.


(4) Large-scale parallel systems. Massive parallel systems (also known as modular machines) use a series of small, individual placement units (also known as modules). Each unit has its own screw position system with a camera and head mounted. Each head can pick up a limited tape feeder, mount a portion of the PCB, and push the PCB step-by-step within the machine at regular intervals. Individual unit machines run slower. However, their continuous or parallel operation has a very high yield. For example, the Philips AX-5 machine can have up to 20 placement heads, achieving a placement speed of 150,000 per hour, which is the industry's first, but for each placement head, the placement speed is About 7 500 hours, there is still the possibility of a substantial increase. This model is also mainly suitable for large-scale production, such as mobile phones. Manufacturers of large-scale parallel system-type machines mainly include Philips, and Fuji Corporation has also introduced an NXT-type ultra-high-speed placement machine using a similar structure. As shown in Fig. 4, a replaceable mounting head can be mounted on the same machine. The high-speed machine can also be a general-purpose machine that can mount almost all mounted components, thereby reducing initial investment in equipment and increasing equipment investment to a minimum.


3 Flexible Mounting Method

The above four types of equipment all have their own unique advantages and attributes. Many companies use two platforms to optimize efficiency and performance. In the past five years, more and more companies have tended to adopt placement equipment with flexible functions. This "eclectic" solution integrates higher placement speeds and a great deal of volume in comparison with conventional high-precision modules. Feeding position. These platforms are still able to meet the full range of mounting requirements for most components, from the smallest passive components to the largest active components. For example, the Siplace device introduced by Siemens adopts a unique flexible means that can be mounted by an acquisition and placement system, and a vertical rotary head system can be used to pick up 12 components. Many other types of gantry, pick and place equipment use multi-tubing heads. Simultaneous "group" picking methods can be used to achieve high placement speeds. However, this method of simultaneous picking does not handle small components very well because it requires extremely precise alignment between the suction nozzle and the feeder. Extreme precision on these devices is impossible to achieve. The alternative is to pick up the components individually, which inevitably increases the time taken for placement. Looking ahead, the kind of "flexible" multi-pipe arched equipment will become the equipment of choice for small to mid-sized order-type assembly companies. The ideal device for this market is the ability to carry out a wide range of placements from a 0201-type device to a large flat flat pack (QFP) device at high speed. The competition in this local market is quite fierce, it can make equipment buyers benefit from price, benefit and overall operation. For large electronic assembly manufacturers, machines with multi-mount head architectures will be very popular, including multi-armed, composite, large-scale parallel systems, etc. These models are also known as "module machines." Since different types of placement units can be flexibly added according to future requirements to meet future flexible production requirements, when the product changes, it is very important to be able to improve the working adaptability of the equipment in time because of new packaging and circuit board strips. New requests came. Investment in a placement device should often be based on current considerations and estimates of future needs.Buying more equipment than is currently required can often avoid business opportunities that may be missed in the future. It is economically more economical to upgrade on existing equipment than to purchase a new one. Based on the above situation, many high-end SMT equipment manufacturers have introduced various architectures with multiple placement heads, such as Global GC60, Panasonic CM602, Hitachi GHX-1, Siemens HS60, Fuji NXT, etc. Gradually replace the turret machine's dominant position in the high-speed machine market.


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