Mold Design 2

1. unit

The mold alignment unit is also called the alignment guide device of the mold blade. In order to ensure the alignment of the upper mold and the lower mold and shorten the preparation time, according to the requirements of product accuracy and production quantity, there are mainly the following five types of mold alignment units: 

(1) Non-guided type: When the mold is installed on the punching machine, the pairing of its blades is directly performed, without the use of guiding devices.

(2) Outer guide type: this type of device is the most standard structure, and the guide device is installed on the upper mold base and the lower mold base without passing through each template, and is generally called the mold base type.

(3) Combined use of outer and inner guides (1): This device is the most commonly used structure for continuous molds. An inner guide is installed between the punch fixing plate and the pressing plate. The combination of the punch and the die utilizes a fixed pin and an outer guide device. Another function of the inner guiding device is to prevent the pressure plate from tilting and protect the small punches.

(4) Combined use of outer guide and inner guide (2): This device is a high-precision and high-speed continuous mold structure, and the inner guide device penetrates the punch fixing plate, the pressing plate and the die fixing plate, etc. . The inner guiding device itself also has the function of aligning and protecting small punches. The main function of the outer guiding device is to get a smooth goal when the mold is disassembled and installed on the punching machine.

(5) Inner guide type: This structure does not use outer guide device. The inner guide device penetrates the punch fixing plate, the pressing plate and the die fixing plate, etc., to correctly maintain the positional relationship of each plate for protection shower.

2. Guide post and guide sleeve unit

There are two types of mold guide methods and accessories: guide posts and guide sleeve units: (A). Outer guide type (mold base type or main guide), 

(B). Inner guide type (or auxiliary) lead). In addition to meet the requirements of precision molds, there is a high demand for the use of both external and internal guidance.

(1) External guide type: Generally used for molds that do not require high precision, most of them are sold as a unit with the mold base. The main function is to align the blades when the mold is installed on the punching machine. There is almost no stamping process. Dynamic accuracy retention effect.

(2) Inner-guided type: Due to the development of mold processing machines, it has rapidly spread. The main function is not only the matching of the blades when the mold is installed on the punching machine, but also the dynamic accuracy maintenance effect in the stamping process.

(3) Combined use of external and internal guidance: a pair of molds use both external and internal guidance devices.

3. Punch and die unit (round)

(1) Punch unit: According to its shape (shoulder type and straight type), length, and convenience of maintenance, the use of the punch unit should be matched with the blank guide sleeve unit.

(2) Concave die unit: The circular die unit is also called the die guide sleeve unit, and its forms are monolithic and separate. It depends on the production quantity, service life, and product or punching location. The combination series are: (A). Use the template to directly process the shape of the die, (B). The escape part with two bevel angles, (C). Whether to use the back plate, (D). Irregular die shape must There is a rotation prevention design.

4. Pressure bolt and spring unit

(1) Pressing bolt unit: The types of press plate bolts are: (A). External screw type, (B). Sleeve type, (C). Internal screw type. In order to maintain the parallel state of the pressing plate at the specified position, the stopping method of the pressing bolt (shoulder contact position): (A). Die seat cavity receiving surface, (B). Punch fixing plate top surface, (C). The top surface of the punch back plate.

(2) Pressing spring unit: movable pressing plate pressing spring unit can be roughly divided into:

 (A). Single use type,

(B). Combined use with pressing bolt.

It is best to consider the following points when choosing a pressing spring unit:

(A). Ensure the free length of the spring and the necessary compression (the spring with large compression should be placed in the cavity of the pressure plate).

(B) Whether adjustment of initial spring compression (pre-compression) or load is necessary.

(C) Consider the ease of mold assembly or maintenance.

(D). Consider the relationship with the length of the punch or pressing bolt.

(E) Consider safety (to prevent the spring from flying out when it is broken).

5. Guide pin unit (positioning of the feeding direction of the strip)

(1) Guide pin unit: The main function of the guide pin is to obtain the correct feeding pitch during continuous stamping. There are two types of guide units for stamping dies: indirect (guide pins are used alone) and direct (guide pins are installed inside the punch).

(2) The assembly method of the guide pin is the same as that of the punching punch (installed on the punch fixing plate). Use a spring to restrain it from the punch fixing plate.

(3) The guide pin is additionally installed on the binder plate, because the guide pin is required to protrude from the binder plate to a certain amount and prevent the material to be processed when the mold rises, the rigidity of the binder plate and It is necessary to pay attention to the guidance form.

(4) The guide pin unit has a direct type, which is installed in the punch, and is mainly used for contour punching (cutting processing) or edge trimming processing of extension engineering. Its position positioning is based on the hole and extension part of the product the inside diameter of.

6. Guide unit

(1) In the shape of punching (cutting) or continuous punching, in order to guide the width direction of the processed material and obtain the correct feeding pitch, a guide unit is used.

(2) The guiding device in the width direction of the strip, the guiding methods are:

(A). Fixed plate guide pin type,

(B). Movable guide pin type,

(C). Plate tunnel guide type (Single plate),

(D). Plate guiding type (two pieces), (E). Lifting pin guiding type (movable type, fixed type, and both.

(3) The guiding device for starting and stopping has two forms:

(1). Slider type,

(2). Movable pin type, etc. The main function is to locate the material at the initial starting position of the mold.

(4) The feeding stop device can accurately determine the feeding pitch. It is mainly used for manual feeding. Its forms are:

(A). Fixed stop pin,

(B). Movable stop pin,

(C). Side cutting stop mode,

(D). Hook stop mechanism,

(E). Automatic stop mechanism.

(5) Side-pushing material guide mechanism, the material is pressed to one side during stamping processing, which can prevent the material from snaking due to the difference between the width of the strip and the width of the guide.

(6). Blank material position positioning and guiding mechanism, its forms are:            

(A). Fixed pin guide type (using the shape of the blank),

(B). Fixed pin guide type (using the hole of the blank),

(C). Guide plate (for large parts),

(D). Guide plate (integrated),

(E). Guide plate (divided).

7. Lifting and topping unit

(1) Lifting pin unit: its main function is to lift the strip to the die during continuous stamping processing (the height of the position is called the feeding height, and achieves the purpose of smooth feeding, and its forms are:

(A). Pin type (round shape, purely for material lifting), is the most common material lifting pin unit.

(B). Material lifting pin type (round shape, with holes for guiding pins), material lifting pins are equipped with guiding pins The use of holes can prevent the material from bearing the deformation of the guide pin and make the guide pin actually work.

(C) The material lifting and the material guide pin type, and both have the material guiding function, the continuous mold guide material is most commonly used in this form of material lifting pin Type.

(D). Lifting pin type (square) If required, there are air blowing holes.

(E). Lifting and guide pin type (square).

(2) Material ejection unit: during automatic stamping processing, it is necessary to prevent punching products or punching chips from jumping on the surface of the die to avoid mold damage and bad stamping parts.

(3). Ejection unit: The main function of the ejection unit is to eject products or waste from the cavity during each stamping process. The installation site of the ejector unit is two:

(A), the reverse configuration mold is installed on the upper mold part, (B). The forward configuration mold is installed on the lower mold part.

8. Fixed pin unit

The shape and size of the fixed pin unit are designed in accordance with the requirements of standard specifications. The precautions when using it are as follows:

(A). The fixed pin hole should be a through hole. If it is not possible, consider a design method that is easy to remove with screws.

(B). The length of the fixed pin should be moderate；and should not be longer than necessary.

(C). The fixed pin hole should have a necessary escape part.

(D). When it is placed in the upper mold part, a mechanism to prevent it from falling should be designed to prevent it from falling.

(E). When one side is press-fitted and the other side is sliding, the fixed pin hole on the sliding side is slightly larger than the fixed pin.

(F). The number of fixed pins is based on the principle of two, try to choose the same size.

9. Press plate unit

The particularly important point of the pressure plate unit is that the pressure surface and the die surface have the correct parallelism and the buffer pressure is required to be balanced.

10. Misfeed detection unit

When the continuous die is used for stamping, the die must be designed with a fault detection unit to detect whether the variation of the feeding pitch exceeds its benchmark and stop the operation of the punch. The error detection unit is installed inside the mold. According to its detection method, there are the following two installation forms:

(A). The detection pin is installed in the upper mold. When it deviates from the strip hole, it will Contact and detect.

(B). The form of the detection pin installed in the lower mold is detected when a part of the strip contacts the detection pin.

11. Scrap cutting unit

During the continuous stamping process, the strip (scrap) will leave the mold one after another. There are two ways to handle it:

(A). Take it up with a coiler,

(B). Use a die cutting device to refine it. There are two methods for the latter: (A). Use a special scrap cutting machine (installed outside the press machine), (B). Install the cutting unit in the final process of the continuous mold.

12. Height stop block unit

The main function of the height stop block unit is to correctly determine the position of the bottom dead center of the upper die. There are two forms:

(A). It is also often contacted during stamping processing,

(B). Contact only during assembly, stamping processing Time-free approach. Also, when the mold is transported and stored； in order to prevent contact between the upper mold and the lower mold, it is better to insert a spacer between the upper mold and the lower mold. When the accuracy requirements are not necessary, the use standard can adopt the screw adjustment type.