Technical Specifications for Punch Presses

Punch presses are categorized into mechanical crank presses (the most common type), pneumatic presses, hydraulic presses, and servo precision presses. Their technical specifications fall into five main categories: core performance parameters, structural dimensions, power and electrical parameters, precision and safety parameters, and physical machine parameters. Below, the Jianlong team provides a detailed breakdown of each item, including reference values for common models, to assist you in your purchasing decisions.

1. Core Stamping Performance Parameters

2. Die Installation Space Dimensions

2.1 Maximum Die Height (Shut Height)

The distance from the bottom surface of the slide to the top surface of the bolster plate when the slide is at Top Dead Center (TDC); this limits the maximum overall height of the die. Typical range: 200–700 mm.

2.2 Die Height Adjustment Range

Allows for fine-tuning the shut height via a screw mechanism to accommodate dies of varying heights; a larger value indicates greater versatility. Standard models: 50–150 mm.

2.3 Bolster Plate Dimensions (Front-to-Back × Left-to-Right)

The effective mounting area of the bolster plate, which limits the external dimensions of the die baseplate; e.g., 25T press: 450×300 mm; 80T press: 700×450 mm.

2.4 Bolster Plate Blanking Hole

A through-hole in the center of the bolster plate for the discharge of scrap or finished parts; available in round or square configurations.

2.5 Bolster Plate Thickness

A thickened bolster plate is standard equipment to protect the table surface; thickness typically ranges from 50 to 100 mm.

2.6 Slide Bottom Dimensions

The mounting surface dimensions for the upper die fixing plate; must match the size of the upper die baseplate.

2.7 Throat Depth (Distance from slide center to inner machine frame wall)

A key parameter for C-frame (open-type) presses; greater throat depth allows for processing wider sheets but reduces off-center load rigidity. Typical range: 180–450 mm.

2.8 Column Spacing (Straight-side/Closed-type Presses)

The distance between the inner faces of the columns on straight-side two-point or four-point presses; accommodates large, wide dies. 

3. Machine Body and Structural Specifications

3.1 Machine Body Type

• J23: Open-back inclinable press (body tilts approx. 30° to facilitate workpiece discharge)

• JH21/J21: Open-type fixed-table pneumatic press (high rigidity and precision; mainstream for mass production)

• J31/J36: Closed-type single-point/double-point press (closed frame, high resistance to off-center loads; for large/medium stamping and automotive sheet metal)

3.2 Slide Guide Type: Standard sliding guide, cross-rail guide, 8-face guide, high-precision ball guide (precision presses)

3.3 Body Material: HT200/HT250 high-strength cast iron, stress-relief treated

4. Power, Electrical, and Pneumatic Specifications

4.1 Main Motor Power

6.3t (1.5kW), 25t (3kW), 63t (5.5kW), 80t (7.5kW), 160t (15kW), 315t (30kW)

4.2 Air Supply Parameters (Pneumatic Clutch Presses)

Standard operating pressure: 0.5–0.7 MPa; air consumption: 100–800 L/min (depending on tonnage)

4.3 Control System

Standard: Relay control; Precision/CNC: PLC + Touchscreen; Servo Press: Servo drive + NC system

4.4 Lubrication System: Centralized forced lubrication / Manual thin-oil lubrication

5. Safety, Precision, and Additional Function Specifications

5.1 Standard Safety Features

• Hydraulic overload protection (automatic pressure release upon overload to protect machine and die)

• Two-hand operation buttons, photoelectric safety light curtains, emergency stop switch

• Slide balance cylinder, brake-clutch interlock, die cushion device

5.2 Geometric Precision (National Standard GB/T 10924)

• Slide movement perpendicularity: ≤0.03mm/100mm

• Worktable flatness; parallelism of the slide bottom surface

• Bottom Dead Center (BDC) repeatability: Standard press ±0.02–0.05 mm; Servo precision press within ±0.005 mm

5.3 Optional accessory specifications

• Die cushion (cushion force, cushion stroke): Used for blank holding during deep drawing processes

• Interface for automatic feeder; scrap cutter; air blow-off nozzle

• Slide ejector pin (part ejection device) stroke and ejection force

6. Physical parameters of the machine

6.1 External dimensions (L x W x H in mm)

6.2 Machine weight (kg/t): Higher tonnage corresponds to higher machine weight (e.g., 63t ≈ 3.5t; 160t ≈ 8t)

6.3 Worktable height from floor: Standard 800–1000 mm (suitable for manual operation)

6.4 Anchor bolt dimensions and foundation load-bearing requirements

7. Example specifications for common standard presses (JH21 Fixed-Bed Pneumatic Press)

Do you need assistance matching the appropriate tonnage and full specifications to your specific stamping material, thickness, and process requirements (punching, bending, or deep drawing)? Please contact us! Our machines are CE certified and fully compliant with the EU Machinery Directive (2006/42/EC); our products are exported to Europe and the Americas, including Germany, the USA, Mexico, and Portugal. If you have inquiries or purchasing needs, please scan the WhatsApp QR code below. Jianlong Hydraulic Technology is dedicated to providing you with personalized, customized professional solutions and excellent service.