Design of large sliders for automotive molds is a complex and critical process. Following are main points of large slider design for automotive molds based on existing information:

 

Slide-out distance: Slide-out distance of slider should be 5~10mm greater than product-to-button distance to ensure that slider can completely detach from product and slide out smoothly.
Slider area: Determine specific position and design area of slider based on specific structure of product and the overall layout of mold.

Sliding guide pin slide-out:
Slanted guide pin angle: It should be 2 degrees less than slider clamping angle, usually not more than 20°.
Size of inclined guide pin: Generally 20~30mm, and diameter is usually not less than φ16mm. Special circumstances need to be determined by company review.
Inclined guide pin fixation: Preferred method is to fix inclined guide pin with a fixing block, and thickness of fixing block is generally about twice diameter of inclined guide pin. For sliders with a height of more than 100mm, guide pin should be fixed to the bottom of slider to ensure smooth sliding. For sliders with a width of more than 200mm, two inclined guide pins should be designed, and size, angle, etc. of two inclined guide pins should be consistent.

 

Cylinder slide-out:
Applicable scenarios: When slide-out distance is large or inclined guide pin slide-out method is not applicable, cylinder slide-out method can be selected.
Cylinder installation: Generally, front flange installation method is used, and a standard cylinder is selected.
Number of cylinders: For sliders with heavier weight, multiple cylinders should be used to ensure smooth sliding of slider.

Press plate: Design a pressure plate to fix slider to prevent slider from moving or deforming during mold opening process.
Limit method:
For sliders that slide out using inclined guide pins, limit method of spring + limit block or limit clamp + limit block can be used.
For sliders weighing more than 15kg, two spring limiters should be used; for sliders weighing more than 40kg, two limit clamps should be used.

 

For sliders with particularly large slopes, an I-shaped block can be added below, and sliding of I-shaped block can be used to drive slider to slide down.
Slider that slides out using oil cylinder should be installed with a travel switch to ensure accurate stop of slider.

Cooling waterway: For sliders with a large molding area, a cooling waterway should be designed for cooling to prevent slider from deformation or damage due to long-term high-temperature operation. Waterway should be connected to mold plate first, then connected from reverse operation side of mold plate.

Locking and positioning: In order to prevent slider from shifting during mold injection process, affecting size and appearance of finished product, a locking positioning method should be adopted. This mechanism is usually called a stop block or shovel base.
Wear-resistant plate: Wear-resistant plates are designed on locking surface and bottom surface of slider to protect slider and mold from wear. Wear-resistant plate should be 0.5mm higher than female mold plate to better protect female mold plate and support slider to prevent deformation due to force.
Sliding guide form: Sliding guide form of slider should ensure that slider does not get stuck or jump during mold production to ensure quality of finished product and life of mold. Commonly used sliding guide forms include guide rails, guide plates, etc.
Slider head entry connection method: Connection method of slider head entry is determined by finished product, and different finished products may have different connection methods for slider entry.
Slider numbering: Slider needs to be numbered, and numbering is in the form of "D+number", numbering must be in a certain order and must not be written at will.
Special considerations:
Wear-resistant blocks must be attached to back and bottom of slider (wear-resistant blocks may not be attached to the bottom in special cases).
Sliders with large lateral forces need to add backhoes.
Large sliders and sliders with more glue positions need to add cooling water.
All sliders need to be limited, and limit column (block) must be buried in mold for more than 5mm. Screws, garbage nails, etc. must not be used to directly install it on sliding bottom of slider.
In summary, design points of large sliders for automotive molds involve many aspects, and it is necessary to comprehensively consider factors such as structure of product, the overall layout of mold, movement mode of slider, cooling method, and wear resistance. Through reasonable design and optimization, stable and reliable operation of slider in mold can be ensured, thereby improving production efficiency of mold and quality of finished product.