Fundamentals of Mold Wholesale Design

1、 According to the structure, stamping die can be divided into three categories: single project die, compound die and continuous die. The first two categories require more human resources, which is not in line with the economic benefits, and the continuous mold can produce a lot of high efficiency. Similarly, it is necessary to plan a set of high-speed, meticulous and continuous stamping dies as a whole, as well as the products you produce (including all products processed with stamping parts). In the overall planning of continuous stamping die, attention should be paid to the spacing between die groups, part processing precision, tower assembly precision, collaboration precision and intervention problems, so as to achieve the purpose of many production of continuous die automation technology.

2、 The definition of modular overall planning: the overall structure of stamping die can be divided into two overwhelming majority: the same part and the part transformed according to the handicraft. The common part can be standardized or normative in many aspects, while the part that changes according to the handicrafts cannot be standardized.

3、 Composition and standard of template:

1. Composition of template

According to the type, composition and difference of the die, the composition of the stamping die will be divided into two categories, namely, the following weapons and equipment type structure and the reverse weapons and equipment type structure. The former is a structure that Z often uses, while the latter is mainly used for flexure forming molds or collaborative unique molds.

The main work includes:

(1) Intelligent drawing - transforming 3D commodity and mold solid models into 2D engineering drawings for basic production and processing tubes;

(2) Intelligent overall planning of moulds: according to the product model and the purpose of overall planning, shape the three-dimensional modeling of relevant moulds& F! D; G4J(y4T0~7J"l;w

(3) Intelligent analysis and simulation of the mold - based on the commodity molding process standards, carry out the structure analysis, thermal analysis, fatigue analysis and fitness movement analysis of the mold parts;

(4) The process of commodity molding system is imitated - injection molding, stamping mold molding; (A-uY"P%g8p+@

(5) Customizing the standard parts and standard overall planning system process suitable for the enterprise's overall mold planning;

(6) Mold production management methods.

2. Standards of moulds

(1) Mold limit and clamping screw+~4Z2E0i/C! N8_# i

The limit of the template shall be greater than the working area, and the standard template limit shall be selected. The direction of the clamping screw of the template is related to the type of mold and the limit of the template. During this period, the clamping screw weapon equipment is often used on the four edges of the mold Z for single project, and the Z standard method can be widely used in the working area. The long strip mold and continuous mold Z are often equipped with clamping screws at the four edges and the middle direction.

(2) The thickness of the template; | X8d+x,X%@,E

The selection of the thickness of the template is absolutely related to the structure of the mold, the type of stamping parts processing, the processing power of stamping parts processing, and the precision of stamping parts processing. It is difficult to determine the thickness of the mold according to the calculation of the basic theory. Generally, it is based on the work experience. The types of the thickness of the mold used in the overall planning should be avoided as far as possible. The height width ratio and clamping height width ratio of the collaborative mold are standardized in many aspects to facilitate purchase and inventory management.

4、 Overall planning of the template:

The main templates of the continuous die include the fixed punch plate, stripper plate, and master template. The overall planning of its structure is based on the precision of the stamping die crafts, the total number of production, the production equipment and processing methods of the die, and the maintenance methods of the die. There are three methods: one block type, yoke type, and embedded type.

1. One piece

A monolithic template is also called an integrated structure, and its production and processing appearance must be closed. A monolithic template is mainly used for the mold with simple structure or low precision. Its production and processing method is dominated by drilling production processing (no quenching and tempering treatment is required). The template with quenching and tempering treatment must be subject to wire cutting processing or charge discharge production processing and grinding production processing. The place with long template limit (continuous mold) will adopt two or several pieces of one body and use it.

2. Yoke type 3b/R'v! R7r&l! f; r

The central government department of the yoke template produces and processes the yoke template into a concave groove shape to assemble small pieces. The structure is in accordance with the application regulations, and the groove part can be composed of other templates. The yoke type template structure has the advantages of simple production and processing of the groove, adjustable total width of the groove, excellent processing accuracy, etc; However, low stiffness is its defect.

Precautions for overall planning of yoke template are as follows:

(1) The yoke plate structure and the inlay of small parts shall adopt the middle cooperation or light cooperation method. If the strong pressure cooperation is adopted, the yoke plate will change.

(2) The yoke plate has the unremitting effect of small parts. In order to accept the side pressure and surface pressure of small parts, it must have the stiffness considered. Also, in order to make the yoke plate groove and small parts compact, the corner of the groove shall be made into a gap escape for production and processing. If the corner of the yoke plate groove cannot be made into a gap escape for production and processing, the small parts must be made into a gap escape for production and processing.

(3) For the segmentation of small parts, the internal appearance shall be taken into account, and the datum point must be clear. In order to avoid deformation during the processing of stamping parts, attention should also be paid to the appearance of each small part. 1z.g9a7t9O)Y

(4) When the yoke plate is assembled into many small parts, the accumulated deviation in production and processing of each small part causes the change of the pitch diameter. The preventive measure is to plan the small parts in the middle as a whole into an adjustable method* {.m)t;V6f8]&F

(5) The die structure of small pieces of parts is formed in parallel. Because small pieces of parts will be pressed during punching production and processing, resulting in gaps between small pieces of parts or skew of small pieces of parts. This situation is the key reason for the poor stamping die limit, punching chip blockage and other poor stamping dies. Therefore, adequate preventive measures must be taken., W; d$v#F4F:P1i)h

(6) According to the size and appearance, the small parts in the yoke plate can be fixed in the following five ways: by clamping screws, by keys, by shape keys, by shoulders, and by upper pressing parts (such as guide plates).

3. Embedded

The concave part of ring or square is produced and processed in the template, and small parts are inlaid into the template. Such template is called embedded structure. The production and processing of this structure has less accumulated dimensional tolerance, high stiffness, and excellent precision reproducibility of splitting and assembly energy. Because of the advantages of simple mechanical production and processing, the processing accuracy is determined by the working machinery and equipment, and there are few engineering projects for post Z adjustment, the embedded template structure has become the mainstream of the fine stamping mold, but its defect is the main bone processing equipment that requires high precision.

When the continuous stamping die adopts this template structure, in order to make the template have high stiffness requirements, the overall planning is empty station. Precautions for embedded template construction are as follows: 0c0F: y&T7w+D # J $q

(1) Production and processing of the inserted main bone: the production and processing of the inserted main bone of the template shall use vertical milling machine (or fixture CNC lathe) comprehensive processing equipment, fixture boring machine, fixture CNC grinding machine, wire cutting charge discharge processing equipment, etc. For the production and processing standards of the implanted main bone, when the wire cutting charge discharge processing equipment is used, the second or higher wire cutting production and processing are carried out to develop its processing accuracy.: d6*R3}:q

(2) Fixation method of embedded parts: The decisive factors of the fixation method of embedded parts include not changing the precision of production and processing, simplicity of tower assembly and splitting, and probability of adjustment. There are four fixing methods for the embedded parts: screw fixing, shoulder fixing, toe block fixing, and upper part pressing with plate. Press in cooperation is also used for fixing the embedded parts of the mother template. At this time, the loosening result caused by processing thermal expansion should be avoided. When using circular mold sleeve inserts to process irregular holes, reverse direction avoidance methods should be planned.

(3) Considerations for assembly and differentiation of embedded parts: The processing accuracy of embedded parts and their holes is required to be high for assembly. In order to obtain that even if there is a slight scale error, it can be adjusted at the time of assembly, it is advisable to consider the handling measures in advance. The specific considerations for the processing of embedded parts are as follows: a press in section is provided to adjust the press in state and correct orientation of the embedded parts with spacers. A press out hole is provided on the bottom of the embedded parts. When locking with screws, screws of the same size should be selected to facilitate locking and loosening. To avoid errors in the assembly direction, Anti sloughing chamfering shall be planned.

Successive die planning skills

5、 Unitized planning:

1. Mold alignment unit

The die alignment unit is also called the alignment guide device of the die blade. In order to truly adhere to the alignment of the upper mold and the lower mold and shorten its preparation time, according to the requirements of product accuracy, production quantity and other conditions, the mold alignment units mainly include the following five types:) s6U "P4z&o'p'g

(1) No guiding type: the die equipment directly conducts the matching operation of its cutting edge when punching, without using guiding equipment. 3%r2o7A'I3X5? 4a

(2) External guiding type: This type of equipment is the structure of Z specification. The guiding equipment is installed on the upper mold base and the lower mold base, and does not pass through each template. It is generally called the mold base type! q&R)X9C.I'W! C5A*U! K

(3) Combined external guiding and internal guiding (I): This equipment is a structure often used to connect the die Z, and an internal guiding equipment is installed between the punch fixing plate and the pressing plate. The alignment of punch and die uses fixed pin and external guiding equipment. Another effect of the internal guiding device is to avoid the inclination of the pressing plate and protect the small punch.+] (B1w3u8t-z)M7g(f2h/Xo4M

(4) Combined use of external guiding and internal guiding (II): This equipment is the application structure of high precision and high speed connecting die. The internal guiding equipment runs through the punch fixing plate, pressing plate and die fixing plate, etc. The internal guiding device itself also has the effect of aligning the die blade and protecting the small punch. The primary effect of the external guiding equipment is the mold differentiation and the smooth intention of the equipment in the punch press.

(5) Internal guiding type: this structure does not use external guiding equipment. The internal guiding equipment runs through the punch fixing plate, pressing plate and die fixing plate, and correctly adheres to the orientation contact of each plate to protect the punch.

2. Guide injection and guide sleeve unit

There are two types of mold guiding methods and accessories, including guide note and guide sleeve unit: external guiding type (mold base type or main guiding type) and internal guiding type (or auxiliary guiding type). In addition, it is required to cooperate with fine molds, and the demand for the use of both external and internal guiding is high.

(1) External guiding type: generally used for molds that do not require high precision. Most of them are sold as a unit with the mold base. The primary effect is that the cutting edge of the mold equipment is matched when it is used in the punch, and there is almost no effect of adhering to the dynamic precision in the stamping process. 4G,Y.z; P0}2x&d7Y3! S

(2) Internal guiding type: due to the progress of mold processing equipment, it has been spreading rapidly in recent years. The main practical effect is not only the blade closing of the die machine and equipment on the high-speed punch, but also the dynamic precision in the processing of stamping parts. 4R1q7w.~1o:aF4]

(3) Combined type of external and internal guiding: one pair of mold shall be equipped with external and internal guiding machines and equipment.

3. Punch pin and die module (annular)

(1) Needle punching module: according to its shape (shoulder type and vertical type), length and convenience of maintenance, the application of needle punching module should cooperate with stripper guide post module. 1u4t9B&_- S"@2L1C*e"E

(2) Master mold module: the annular master mold module is also called the master mold guide pillar module. Its methods include a whole block type and a separate type. According to the total production, application life, and the workability of handicrafts or punching chips, the master mold module consists of a series of products: the master mold pattern is immediately produced and processed by using the template, with a gap escape part of two diamond sections. Whether the side plate is to be applied, and the irregular master mold must have an overall plan to prevent overturning.

4. Stripping anchor bolt and tension spring module

(1) Stripping anchor bolt module: the types of stripper plate anchor bolts are: external screw type, sleeve type, and internal screw type. In order to persevere in the situation that the stripper plate is parallel to the surface in a specific direction, the interruption method of the stripper anchor bolt (shoulder touching position): the concave receiving surface of the mold base, the punch pin fixed the top of the panel wall, and the punch pin side panel wall top. 7Y2Z,G*`#e&^9I; Q%F1F+Z

(2) Stripping tension spring module: movable stripper pressing tension spring module can be roughly divided into: single person application type, and stripping anchor bolt type

When selecting the stripper tension spring module, Z should consider the following important factors: $J] 0n; P5v! [:v:x4Q

Ensure the free length of tension spring and the necessary tightening amount (for tension spring with large tightening amount, it is better to place the stripper recess)# J$@7g&I1M/dn+h$f2W2D&T

It is necessary to adjust the tension spring tension (torque reduction) or load in the early stage; 5a)P/],L(?6r

Consider the simplicity of mold tower assembly or maintenance* C! p7U$@%w+S

Consider the connection with the length of the punch pin or stripper anchor bolt;

Consider the safety factor (to prevent the spring from flying out when it breaks).

5. Guide pin module (accurate positioning of strip feeding direction)

(1) Guide pin module: the main practical effect of the guide pin is to obtain the appropriate feed pitch diameter during the processing of continuous stamping parts. There are two methods for the guide module used for stamping dies: immediate type (the guide pin is used by one person alone) and immediate type (the guide pin is placed inside the punch pin).

(2) The assembly method of the guide pin is the same as that of the punching needle of the punching machine (installed on the fixed fixed plate of the punching needle). The tension spring shall be used to restrict it to the fixed plate of the punch needle. 9K)w0k-q:#Fa9n%j'R

(3) Other methods of placing the guide pin on the stripper plate are specified because the guide pin highlights that the amount of the stripper plate is inevitable and it is easy to carry the produced and processed materials to prevent the mold from rising. The rigidity of the stripper plate and the method of supporting must be noted. 8q6~$q5w%j5[/r,p/W2m6r

(4) The guide pin module has an immediate type, which is installed in the punch pin, and is mainly used for the trimming production and processing of the appearance design shearing and pressing (cutting production and processing) or flexure engineering projects. Its precise orientation is the nominal diameter of the hole and flexure part of the applied handicraft.

6. Material guide module

(1) In the process of appearance design shearing and pressing (cutting for production and processing) or continuous stamping, the material guide module is used to guide the overall width of the material to be processed and obtain the proper feed pitch diameter S6P6z2V,N,d$_* m&C

(2) For the guiding machine and equipment in the overall width direction of the strip, the guiding methods include: fixed fixed plate guiding pin type, mobile guiding pin type, plate tunnel construction guiding type (single plate), plate guiding type (composed of two pieces), and lifting pin guiding type (movable, mobile, and both).

(3) There are two methods for starting to interrupt the guiding machine and equipment: sliding rail type and promotable type. The main practical effect is to accurately locate the starting direction of the material placement mold.

(4) The feeding interruption machine and equipment can properly determine the feeding pitch diameter, which is mainly used in the places where everyone has to feed. The methods include: mobile interruption pin, movable interruption pin, edge cutting interruption method, hook interruption mechanism, and fully automatic interruption mechanism. Die Maker Magazine Mobile WeChat Mode 1 ` 6 [- U4f: r'E

(5) The side pushing guide mechanism can prevent the material from snaking due to the difference between the total width of the strip and the total width of the guide when the stamping part is processed. 0~0_' a6R/|*g0y1F

(6) The guide mechanism is precisely positioned in the direction of the blank, and the methods are as follows: fixed fixed pin guide type (using the appearance design of the blank); Fixed fixed pin guide type (using the main bone of the preform); Guide plate (for large parts); guide