The 100-ton stretching machine is also called the deep drawing hydraulic press, which is divided into a four-column deep drawing hydraulic press and frame-type deep drawing hydraulic press from the fuselage structure; it can be also divided into single-action deep drawing hydraulic press and double-action deep drawing hydraulic machines. According to the different stretching workpieces, various forming methods such as hydraulic pad stretching, lower ejecting cylinder stretching, and die stretching are commonly used.

How 100 Ton Stretching Machine Works

The 100-ton stretching machine is suitable for various stamping processes such as stretching, bending, forming, punching, blanking, and flanging of plates. It is used in the manufacture of various containers and large automobile covers, etc., and in the molding of non-metallic materials.

1. Equipped with oil cooling device and light curtain safety protection device;

2. Optional touchscreen display and PLC programmable control system;

3. Equipped with liquid filling device for quick approaching stroke.

The 100-ton stretching machine works as follows:

1. Jogging: Press the corresponding button to generate the corresponding action, and release it to stop the action.

2. Manual: Press the corresponding button to produce the corresponding action until the limit position.

3. Semi-automatic.

(1) Constant pressure control: the sliding beam descends rapidly → descends slowly → pressurizes to the upper limit of the electric contact pressure gauge, then delays holding pressure → relieves pressure → returns (stops afterward).

(2) Constant position control: the sliding beam descends rapidly → descends slowly → pressurizes. When the sliding beam touches the proximity switch, it sends a signal to start holding the pressure delay → unloading → return (stop after).

With the rapid development of the automobile industry, especially the continuous expansion of the scale of light truck production, the main structure of its chassis - longitudinal beam primary forming equipment demand is also expanding. The traditional production process is the use of dozens of drilling press drilling and then forming, and now most manufacturers have used beam CNC punch punching processing, and efficiency has been greatly improved.

Shuntec Hydraulic Press System Introduction
How 100 Ton Stretching Machine Works 3

The Shuntec hydraulic press system is mainly composed of Siemens S7-300 PLC, Siemens TP1200 touch screen, Germany NOVO displacement sensor, Rexroth proportional flow valve, Jining Taifeng hydraulic system, high proportion pump, and so on.

Set relevant parameters in the touch screen, according to the feedback signal of the displacement sensor, S7-300 PLC after operation and processing control hydraulic components and proportional pump action, achieve process control requirements.

In addition, a proportional flow valve is arranged on the pipeline of the lower chamber of the oil cylinder. When the slider moves from fast to slow, the control signal of the proportional flow valve is changed to realize the adjustment of the valve port, so as to realize the smooth transition of the speed of the slider from fast to slow without impact.

A servo-hydraulic press is the servo motor-driven hydraulic press integrated with the precision pressure and position transducer for closed-loop control. The servo-hydraulic press uses the servo motor to replace the ordinary transmission motor. The motion curve of the press slider can be set according to the process requirements. Also, the pressure, stroke, and speed are freely adjustable on HMI. Thus, the servo-hydraulic press is widely used for high-precision molding processes, and for difficult-to-form materials and parts with complex shapes. It greatly improves the processing accuracy and the yield of the products, at the same time, it is more energy saving.

Servo-hydraulic press machine benefits

Compared with traditional hydraulic presses, the benefits of servo-hydraulic presses are obvious in the following points: 

    1. Universality, flexibility, and high level of intelligence

Due to its servo function, the slider movement curve is no longer just a sine curve but could be adjusted according to the process requirements. 

    2. High accuracy

Due to the advanced linear position transducer and pressure transducer, the motion of the slider could be precisely controlled and monitored. The position control accuracy is high level, especially near the position of the bottom dead center, the accuracy of the slider position can be guaranteed within ±0.01mm. The pressure control accuracy could be ensured within 1%. In this way, each punch of the servo-hydraulic press is highly stable during the production process. With a servo-hydraulic press, we could maintain production consistency and prevent the generation of defective products.

    3. High productivity  

The servo-hydraulic press retains the advantages of the crank press, the productivity is much higher than the conventional hydraulic press. During a working cycle, there is no need to complete a 360-degree rotation for the servo motor, and only need to swing a certain angle to complete the punching cycle, which further shortens the cycle time. It minimizes unnecessary travel of the slider and greatly improves productivity.

Hydraulic press machines are widely used in the manufacturing industry, but hydraulic presses need maintenance throughout their serving life. Let me share with you the five main points for simple hydraulic press machine maintenance.

Simple Hydraulic Press Maintenance
How 100 Ton Stretching Machine Works 9

1. The oil liquid level of the oil tank should always be kept high enough to ensure that the oil in the system has sufficient circulating cooling conditions. Also, We should pay attention to keep the oil tank and oil pipes clean to facilitate heat dissipation. Generally, the safe operating temperature of the hydraulic press is 30℃-55℃, which is the most suitable temperature for use. With this temperature range, the hydraulic press machines could have the highest performance and the longest-serving life.

2. Hydraulic oil is the energy transfer medium when the hydraulic station is working. The quality, cleanliness, and viscosity of the hydraulic oil play a leading role throughout the serving life of the hydraulic pump, hydraulic valve, and hydraulic cylinder. Therefore, the quality of the hydraulic oil should be paid great attention to when using the hydraulic station. We should keep the hydraulic oil clean. The oil used in the hydraulic system must be strictly filtered, and the oil filter should be a must configuration in the hydraulic system.

3. The hydraulic oil must be replaced each year, and the first replacement time should not exceed three months; in order to ensure the reliable operation of the press, some components of the press are recommended to be replaced after the service life cycle is reached.

4. The sliding block should be filled with lubricating oil frequently, and the exposed surface of the columns should be kept clean and lubricated frequently. In order to prevent dust and water from falling into the oil, the area around the oil tank should be kept clean and regular cleaning should be carried out.

5. The working pressure output is adjustable by the pressure regulating valve. Under normal circumstances, the set pressure cannot exceed its original design rated pressure. Otherwise, it may cause damage to the hydraulic pump, hydraulic valves, and hydraulic cylinders. 

1. Structure

1) The machine body of the servo-hydraulic press can be designed in any of the traditional frame structures such as 2-post, 4-post, benchtop, c frame, etc., which are simple and compact and only takes up small area. 

2) The common type of the main cylinder is a piston-type oil cylinder with a fast cylinder inside, which can achieve high-speed downward movement and slow-speed pressing of the down-acting stroke. The double-start operation is safe and very convenient.

3) Any location through the whole journey can be positioned by an electronic ruler. High-precision positioning adopts a mechanical dead limit, and the theoretical positioning accuracy is ±0.01mm, whereas the actual positioning accuracy ranges from 0.01-0.02mm.

4) The electrical system adopts the mode of PLC + servo 

System + touch screen + proportional drive, and in collaboration with the proportional hydraulic system, it gives instructions according to specific process requirements to complete cycles of actions.

5) Multiple groups of parameter programs can be accessed freely from the friendly human-machine interface. 

6) Pressure is detected by a pressure sensor, and the machine pressure can be set according to actual needs. 

7) The servo-hydraulic press machine is optional with a shuttle worktable, which can move in and out of the working area automatically for automatic feeding. 

8) The pressing speed is fast, and the pressing cycle of a single product takes only 4-5 seconds.

2. Application

1) The servo-hydraulic press can be used for pressing operations in such areas as motor, auto parts, home appliances, and electronics industries.

2) Used in constant pressure system.

3) Used in compression and extension test system.

4) Embossing, forming, shallow drawing, shaping, and pressure fit of metal or non-metal parts. Pressing of glasses and hardware products.

5) The wide range of applicable products includes watch cases, glasses, mobile phone products, tableware, signs, jewelry, parts, etc.

Servo press machine, as a new technology, has advantages that traditional hydraulic presses do not have. In automotive manufacturing processes, such as cylinder head valve seat ring and pipe press fitting, cylinder waterway blanking cap press fitting, transmission bearing press fitting, wheel hub assembling, and others, the servo press machine is gradually taking place of traditional hydraulic presses and has significantly improved the level of the automobile manufacture process. 

Analysis Of  Advantages

1. High Efficiency And Energy Saving

There is no energy consumption caused by clutch friction and flywheel idling. What’s more, the motor itself is of high efficiency, which makes the servo press machine highly efficient and energy-saving.

2. Intelligent Automatic Numerical Control

The operation of the press is controlled by a high-speed computer intelligent numerical control system, which can be fully automated without resorting to manual operation.

3. Long Service Time Of Mold

The pressure is numerically controlled, so the mold will not be overloaded, worn, or damaged.

4. The Products Are Precisely Formed, With Small Tolerances And High Precision

The pressure is under stable numerical control, and the mold wear is reduced to a minimum. The products are precisely formed under precise numerical control. The forge pieces have no/few trimmings, tolerance is small, and precision is high. No/few cutting is needed. Subsequent processes such as milling and digging are also not needed. With such capability, stud gear and bevel gear can be directly shaped and produced. 

5. High Reliability

The servo press has no quick-wear parts, the motor rotor has neither windings nor conductors and not to mention permanent magnets. It is stronger than permanent magnet servo motors, sturdy, reliable, and shock-resistant. The equipment is maintenance-free and thus does not entail any maintenance personnel and working hours. 

6. Intelligent Mold Adjustment

The machine body is equipped with a tonnage sensor, which can adjust and test the mold under pressure control. When the slow-speed mold adjustment and short-distance mold alignment are performed, the machine will not be caused to stop. And for mold adjustment and trial, no special equipment and personnel are needed, which saves human resources and working hours.

7. Information Management

The process parameters are numerically controlled in real-time and feedback is given by the communication network in real-time, which realizes the information control of product quality and the traceability of product quality.

8. Resource-saving And Environment-friendly

No permanent magnet rare earth materials are needed, which saves rare and valuable resources and avoids damage to the environment caused by the mining of rare-earth.

9. The Human-machine Interface Has Good Interaction

The motor is numerically controlled. In this way, the user can only input simple displacement and speed parameters to realize the numerical control of an intelligent flexible process curve. The users do not need to compile the process curve by themselves, which shows the great convenience of the machine. 

10. The Structure Of The Equipment Motor-deceleration Mechanism-brake-working Unit Is Extremely Simple And Concise, And The Cost Is Low.

With the rapid development of modern industry, the automated production equipment for servo presses is gradually developing towards intelligence, flexibility, energy-saving, high precision, high quality, and high safety.

Compared with traditional hydraulic press machines, servo-hydraulic press machines have the advantages of energy-saving, low noise, high efficiency, and convenient maintenance. The specific analysis is as follows:

1. Energy Saving

Servo hydraulic press, according to different processing techniques and production cycles, the servo-hydraulic press can save power by 20% to 60%.

(1) When the slider is quickly descending and the slider is stationary at the upper limit, the servo motor does not rotate, so no electric power is consumed. By comparison, the motor of the traditional hydraulic press still rotates at the rated speed and still needs to consume 20%-30% of the rated power.

(2) In the pressure holding stage, the servo motor speed of the servo-hydraulic press machine only supplements the leakage of the pump and the system. The speed is generally between 10 pm and 150 pm, and the power consumption is only 1% to 10% of the rated power.

 (3) The efficiency of the servo motor is about 1% to 3% higher than ordinary ones and thus is more energy-saving.

2. Low Noise

Servo hydraulic oil pumps generally use internal gear pumps, while traditional hydraulic machines generally use axial plunger pumps. Under the same flow and pressure, the noise of internal gear pumps is 5dB~10dB lower than that of axial plunger pumps.

3. Less Heat Emission And Thus Reducing Cooling Costs

The hydraulic system of the servo-hydraulic machine has no overflow heat, and there is no flow when the slider is stationary, so there is no hydraulic resistance heat. The heat emission of the hydraulic system is generally only 10% to 30% of that of a traditional hydraulic machine.

4. Less Hydraulic Oil Consumption

Because the pump is at a state of zero speed and low heat emission most of the time, the oil tank of the servo-hydraulic machine can be smaller than that of the traditional hydraulic machine, and the oil can be used for a longer time. Therefore, the hydraulic oil consumed by the servo-hydraulic press machine is generally only about 50% of the oil consumed by the traditional hydraulic machines. 

5. Fully Closed-loop Digital Precision Control

Servo hydraulic press machine is featured by a high degree of automation, good flexibility, and high precision. On one hand, the pressure, speed, and position of the servo-hydraulic press are fully closed-loop digital controlled, with a high degree of automation and good precision. On the other hand, its pressure and speed are programmable to meet the needs of various processes.

6. High Efficiency

Through proper acceleration and deceleration control and energy optimization, the control speed of the servo-hydraulic machine can be greatly improved, and the work pace, which can reach 10/min~15/min, is several times higher than that of the traditional hydraulic machine.

7. Convenient Maintenance

The hydraulic system is greatly simplified due to the elimination of the proportional servo hydraulic valve, speed control circuit, and pressure control circuit in the hydraulic system. The cleanliness requirements of hydraulic oil are much lower than hydraulic proportional servo systems, which reduces the impact of hydraulic oil pollution on the system.

The Hydraulic Press Machine Is One Of The Most Widely Used Equipments In Product Molding And Manufacture. Since its appearance in the 19th century, it has developed very quickly. Due to its wide adaptability, the hydraulic press has been extensively used in various sectors of the national economy. As the hydraulic system and the structure of the hydraulic press are relatively mature, the current development of hydraulic presses at home and abroad is not only reflected in the control system but mainly manifested in the following four aspects as well:

The first aspect is high speed, high efficiency, and low power consumption.

The second is its integration of mechanics, electronics, and hydraulics which help to perfect the whole hydraulic system by fully and reasonably using advanced mechanical and electronic technology. 

The third one is its automation and intelligence which can realize automatic diagnosis and adjustment of the system and pretreatment of malfunction. 

Last but not least, the hydraulic components are integrated and standardized to effectively prevent leakage and pollution.

As the two major components of the hydraulic press, the main engine, and the hydraulic system, due to the maturity of technology development, there is no big gap between domestic and foreign models. The main difference lies in the processing technique and installation. Good craftsmanship has obviously improved the function of filtering, cooling, and shock & vibration prevention. In terms of oil circuit structure design, hydraulic machines at home and abroad tend to adopt integrated and closed designs. Cartridge valves, superimposed valves, and composite components and systems are widely used in hydraulic systems. In particular, the integrated block can realize professional production, and what’s more, it has premium quality, reliable performance, and a short design cycle. 

In recent years, the circuit composed of new hydraulic components developed on the basis of the integrated block also has its unique advantages. Since it does not require additional connectors, its structure is more compact with a relatively smaller volume and lighter weight. No pipe connection is required and thus eliminates leakage, vibration, and noise caused by oil pipes and joints. The logic cartridge valve has the characteristics of small size, lightweight, good sealing performance, low power loss, fast action speed, and easy integration. It appeared in the early 1970s and has since developed rapidly. 

Servo Hydraulic Press Is A New Style Of Electric Pressing Equipment. In the line of punching and press fitting products, servo-hydraulic press stands out with its advantages of high precision, intelligence, flexibility, power efficiency, and stability. It is commonly used in the press-fitting operation of such areas as auto parts, engine pack, circuit board, motor bearing, scientific research, and special units. Industry insiders should know and grasp the common knowledge of servo-hydraulic press with a conscientious attitude, which will otherwise affect the overall understanding of the product and project. In view of the above, we introduce the following common knowledge of servo-hydraulic press:

1. Which frame structure should servo-hydraulic press adopt? Welding structure or cast structure? What is the difference between them?

Servo hydraulic press with welding structure has greater pressure bearing capacity than that with cast structure, so large-scale or high-duty servo-hydraulic press generally adopt welding structure.  

2. What material is the stamping mold cutter made of? 

The stamping mold cutter in the servo-hydraulic press is generally made of carbon or alloyed tool steel. The carbon tool steel or alloy tool steel has to undergo heat treatment to reach HRC60 hardness, otherwise, they can not be used for the cutter.

3. What is the cushion block of the servo-hydraulic press made of?

The cushion block of servo-hydraulic press is generally made of concrete. 

IMT (Inner Molding Translate label) or (Insert Molding Three-dimensional) is a synthesis and extension of in-mold injection molding technology and in-mold transfer printing technology.

It brings together the advantages of a variety of decoration processes: it adopts the advantages of the IML process in the production of the film, absorbs the advantages of the IMR process, and combines the digital printing and offset printing effects with the traditional screen printing process, which makes it highly adjustable and widely applicable, and makes up for the limitations of traditional exterior decoration technology and meets the high-level innovation requirements of product exterior decoration. The 3D effect and product stretching meet the in-mold decoration process of more products.

The advent of the IMT technology process will replace oil spraying, UV overprinting, electroplating, vacuum color plating, silk screen printing, pad printing, transfer printing, and other processes, and will drive leapfrog innovation in the product appearance industry. It has realized three-dimensionality, color gradients, R angles, and other irregular product appearance decoration effects. It has also provided better innovation and realization platform for the exterior design industry.

Plastics Are Reborn In 5G Era

The 5G era is coming, and the mobile phone housing materials will change from plastic to metal and then back to non-metallic materials. Plastics are favored by the low-end market because of their low cost. But now the new IMT process has made plastic the favorite choice of many CMF designers. We cannot evaluate the specific cost of the back cover material alone but should integrate it with the middle frame as a whole to position the price of the product. There are several types, from low-end to high-end mainly including plastic + metal middle frame, 2.5D glass + metal middle frame, 3D glass (ceramic) + metal middle frame.

IMT High Pressure Forming Machine

The IMT high-pressure forming machine is a brand-new numerical control device. It is written by configuration software and uses a high-color touch screen as a carrier to form a friendly human-machine dialogue window, which greatly facilitates users’ visual input and use of production parameters and direct monitoring of on-site production process data including equipment status, forming integrated equipment of oil pressure, position, air pressure, and IR hot pressing.

IMT Technology Application

The name of the traditional IMT process appeared in China back in 2006. In fact, it is similar to the IMR process in Japan. The process at that time was equivalent to the PET carrier of the IML process after its color is removed and left in the plastic part. The radian of products was then not large(2D), and the appearance is not varied enough; basically there were only silkscreen and color layers, very few metallic colors.

The new IMT technology is combined with the most popular 3D optical texture + PVD decoration method. Products processed by this new technology have a more beautiful appearance and larger radian compared with products processed by traditional method. Currently, the new IMT technology has evolved from 3D optical texture + PVD to double 3D optical texture +PVD. 

For mobile phone housing made of plastic + metal middle frame, it is the amount of metal CNC processing that determines the price of the whole housing. Compared with the high-pressure composite plate which was very popular last year, the IMT back cover can not only serve as a decorative part, but also a part of the structural part as well, and so as to reduce the processing time of the middle frame. Therefore, it is quite competitive in the 5G era.

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