Common troubleshooting of fixed table press

In the field of metal processing, fixed table press are the core equipment, and their performance directly determines production efficiency and product quality. However, facing the dazzling array of models and parameters in the market, how to accurately screen out devices that meet one's own needs? This article will start from five core parameters, combined with industry technical standards and practical application scenarioses, to provide scientific basis for procurement decision-making.

1.Nominal pressure: the core indicator of stamping ability

The nominal pressure is the core parameter for measuring the load-bearing capacity of a fixed punch press, which refers to the maximum pressure that the slider can withstand at a specific distance (usually 1-6mm) from the bottom dead center, measured in kilonewtons (kN) or tons (t). For example, the nominal pressure of JH21-400T fixed table press reaches 4000kN (400 tons), which can meet the punching and stretching needs of large metal sheets.
Key selection points:
1. Material thickness and strength: When processing materials such as stainless steel and high-strength alloys, equipment with a nominal pressure 20% -30% higher than the theoretical calculation value should be selected to cope with material deformation resistance.
2. Multi process composite processing: If multiple processes such as punching, stretching, and forming need to be completed in one stamping, the equipment should be selected according to the maximum process pressure to avoid mold damage caused by insufficient pressure.

3. Safety factor: It is recommended to choose a model with a nominal pressure of 1.2-1.5 times the actual demand to cope with unexpected situations such as material fluctuations and mold wear.

2.Sliding stroke and number of strokes: balance between efficiency and accuracy

1. Slide stroke

The slider stroke refers to the distance traveled by the slider from the top dead center to the bottom dead center, which directly affects the height and processing range of the mold. For example, the slider stroke of JH21-400T is 270mm, which can be adapted to molds with a height of ≤ 250mm and is suitable for processing large parts such as automotive coverings.
-Selection logic:
Small part processing: Choose models with a stroke of 100-150mm, such as J21-80T (stroke of 100mm), which can increase stamping frequency and are suitable for the production of precision parts such as electronic components.
Deep stretching process: It is necessary to choose a deep throat fixed punch press with a stroke of ≥ 300mm (such as JB21S-80T throat depth of 800mm) to avoid interference between the mold and the machine body.

2. Number of trips

The number of strokes refers to the number of reciprocating movements of the slider per minute, which directly determines production efficiency. The stroke frequency of a regular fixed table press is 20-60 times/minute, while a high-speed precision fixed table press can reach 800-1200 times/minute.
-Efficiency optimization strategy:
Mass production: Priority should be given to models with a stroke count of ≥ 40 times/minute, such as JH21-160T (45 times/minute), to shorten the processing time of individual pieces through high-frequency stamping.

Automated production line: It is necessary to match the pace of the feeding machine. It is recommended to choose a model with adjustable stroke times (such as 20-60 times/minute adjustable in segments) to avoid production interruptions caused by mismatched speeds.

3.Closing height and worktable size: key to mold compatibility

1. Closing height

The closing height refers to the distance from the bottom of the slider to the workbench when the slider is at the bottom dead center. This parameter needs to be strictly matched with the height of the mold, usually meeting the following requirements:
Maximum closing height ≥ mold height+10mm (safety margin)
Minimum closing height ≤ mold height -5mm (to avoid interference)
For example, the maximum closing height of JH21-400T is 550mm, with a mold height adjustment of 120mm, which can adapt to molds with a height of 430-550mm and flexibly respond to different product switching needs.

2. Workbench size

The size of the workbench (length x width) should cover the outer contour of the mold base and reserve 100-150mm of installation space. For example:
To process a 500mm × 800mm automotive sheet metal mold, it is necessary to choose a model with a worktable size of ≥ 650mm × 950mm (such as J21-125T worktable 750mm × 1150mm).

Small electronic component molds (such as 300mm × 400mm) can choose compact models with workbench dimensions of 500mm × 600mm to save space.

4.Throat depth: the core constraint of processing space

The throat depth refers to the distance from the center of the slider to the front wall of the machine body, which determines the maximum width of the parts that can be machined by the fixed punch press. For example:
The throat depth of a regular fixed punch press is usually 300-500mm, which is suitable for processing small parts.
The deep throat fixed table press (such as JB21S-80T throat depth 800mm) can process large parts such as boxes and cabinet doors with a width of ≤ 750mm, avoiding deformation caused by insufficient space during processing.
Selection suggestion:
When processing parts with a width ≥ 500mm, priority should be given to machines with a throat depth ≥ 600mm.

If it is necessary to process annular parts (such as flanges), it is necessary to ensure that the throat depth is greater than the outer diameter of the part+50mm (operating space).

5.Motor power and energy consumption: core considerations for long-term costs

The motor power determines the power output of the fixed punch press, directly affecting energy consumption and processing stability. For example:
JH21-400T is equipped with a 37kW motor, which can stably output 4000kN pressure and is suitable for continuous high load production.
Small fixed table presses (such as J21-80T) use 7.5kW motors to meet the 800kN pressure demand while reducing energy consumption costs.
Energy saving optimization strategy:
Variable frequency speed regulation technology: Choose a model that supports variable frequency control (such as JH21-250T variable frequency model), and adjust the motor speed according to processing needs, saving 15% -30% energy.
Energy recovery system: Some high-end models (such as high-speed precision fixed table presss) are equipped with flywheel energy recovery devices, which can convert braking energy into electrical energy and feed it back to the grid, further reducing energy consumption.

Power matching principle: To avoid "small horse pulling big car" (overload caused by insufficient motor power) or "big horse pulling small car" (energy waste caused by power redundancy), it is recommended to calculate the required power comprehensively based on nominal pressure and stroke times.

6.Conclusion: Parameter collaboration, precise selection

The five major parameters of a fixed punch press do not exist in isolation, but need to be considered collaboratively. For example:
1. High nominal pressure models usually require matching with high-power motors and reinforced bodies to ensure stability;
2. The design of the slider guide rail for the deep throat fixed punch needs to be optimized to avoid a decrease in rigidity due to the deepening of the throat;

3. High speed fixed table presss need to use low inertia flywheels and high-precision clutches to achieve high-frequency stable punching.

When purchasing, it is recommended to prioritize the selection of standardized models with reasonable parameter redundancy and mature technology, taking into account production scale, product characteristics, and budget. Equipment performance should be verified through on-site testing to ultimately maximize investment return.