Stamping die design technology
2023-12-28 10:08:23
The circular or square recess is machined in the formwork, and the block part is embedded in the formwork. This type of formwork is called a built-in structure. This structure has less cumulative tolerance, high rigidity, and precision reproducibility during decomposition and assembly. good. Preface Stamping dies can be divided into three categories: single engineering mold, composite mold and continuous mold. The first two categories require more manpower than economic benefits, and the continuous model can be mass-produced with high efficiency. Similarly, design a set of high-speed precision continuous die, but also for the products you produce (including all products processed by stamping, Foxconn Group mainly has terminals, computer casings and connectors for connectors and current mobile phone parts, etc. Wait). To design continuous die, attention should be paid to the spacing between the modules, the machining accuracy of the parts, the accuracy of the assembly, the accuracy of the matching and the interference problem, so as to achieve the purpose of mass production of continuous mode automation.
The concept of unitized design The overall structure of the stamping die can be divided into two parts: (1). Common part (2). The part that changes according to the product. The common part can be standardized or standardized, and the part that changes according to the product is difficult to normalize.
The composition and specifications of the template 1. The composition of the template The composition of the stamping die varies depending on the type and composition of the mold, and there are two types of configurations: the configuration of the configuration and the configuration of the reverse configuration. The former is the most commonly used construction, and the latter is mainly used for extension forming dies or with special dies.
The main tasks involved include:
(1) Digital drawing--converting 3D products and mold models into 2D engineering drawings used in conventional processing;
(2) Digital design of the mold--based on the product model and design intent, establish the relevant 3D solid model of the mold;
(3) Digital analysis and simulation of the mold--structural analysis, thermal analysis, fatigue analysis and motion analysis of the mold according to the product forming process conditions;
(4) Simulation of product forming process - injection molding, stamping;
(5) Customized to fit the company's mold design standard parts and standard design process;
(6) Mold production management.
2. Specifications of the mold (1). The size of the mold and the size of the locking screw template should be larger than the working area, and the standard template size should be selected. The position of the template locking screw is related to the type of mold and the size of the template. Among them, the single engineering mold is most often used in the four corners with the locking screws, and the most standard working area can be widely used. Long molds and continuous molds are most often placed in the four corners and intermediate positions using locking screws.
(2). The thickness of the template is selected in absolute relation to the structure of the mold, the type of stamping, the processing force of the press, and the precision of the press. It is difficult to determine the thickness of the mold according to theoretical calculations. Generally, it is obtained by experience. The thickness of the template used for design should be as small as possible, and the mold height and clamping height should be standardized to facilitate procurement and inventory management.
Template design The main templates of continuous molds include punch fixing plate, pressing plate, mother plate and so on. The structure design depends on the precision of stamping products, the quantity of production, the processing equipment and processing method of the mold, the maintenance method of the mold, etc. The following three forms: (1) monolithic, (2) yoke, (3) inlaid.
1. The monolithic monolithic formwork is also known as the one-piece construction and its machined shape must be closed. The monolithic formwork is mainly used for simple structures or molds with low precision. The processing method is mainly for cutting (no heat treatment is required), and the heat treatment template must be subjected to wire cutting or electric discharge machining and grinding. In the case of a long template size (continuous mold), two or more integrated types will be used.
2. The center portion of the yoke stencil is machined into a groove shape to assemble a block product. The structure depends on the application requirements, and the groove portion can be formed by other templates. The advantages of the yoke formwork are that the groove portion is easy to process, the groove portion width can be adjusted, and the machining accuracy is good. But low rigidity is its shortcoming.
The design considerations for the yoke template are as follows:
(1). The yoke plate structure and the block part are fitted with a middle fit or a light fit. If the press fit is used, the yoke plate will be changed.
(2) The yoke plate and the retaining function of the block parts must have sufficient rigidity to withstand the side pressure and the surface pressure of the block parts. Further, in order to make the yoke groove portion and the block portion tightly combined, the groove portion angle is made into a relief process, and if the yoke groove portion angle cannot be made into a relief process, the block portion must be made into a relief process.
(3). The division of the block parts should take into account the shape of the interior, and the datum must be clarified. In order to prevent deformation during stamping, attention should also be paid to the shape of each block.
(4) When the yoke plate is assembled into a plurality of block-shaped parts, the pitch is varied due to the processing error of the block parts, and the countermeasure is that the intermediate block parts are designed to be adjustable.
(5). The mold structure in which the block parts are combined side by side, the block parts are subjected to the side pressure during the punching process, and a gap is formed between the block parts or the block parts are inclined. This phenomenon is an important cause of poor stamping, punching and chipping, etc., and therefore sufficient countermeasures must be taken.
(6). The fixing method of the block parts in the yoke plate has the following five types according to its size and shape: A. fixed by a locking screw, B. fixed by a key, C. fixed by a key, D. shoulder The part is fixed, E. The above pressing parts (such as the guide plate) are pressed and fixed.
3. The circular or square recess is machined in the inlaid formwork, and the block part is embedded in the formwork. This type of formwork is called the inlaid structure. The structure has less cumulative tolerance, high rigidity, decomposition and grouping. The accuracy of the instant is good. The inlaid formwork structure has become the mainstream of precision stamping dies because of its advantages of easy machining, machining accuracy determined by the working machine, and minimal adjustment. However, the disadvantage is that it requires a high-precision hole machining machine.
When the continuous stamping die is constructed using this formwork, the empty station is designed to make the formwork have high rigidity requirements. The precautions for the inlaid template construction are as follows:
(1). Processing of embedded holes: The vertical hole milling machine (or fixture milling machine), integrated processing machine, fixture boring machine, jig grinding machine, wire cutting electric discharge machine, etc. For the machining standard of the embedded hole, when the wire-cut electrical discharge machine is used, the wire cutting process is performed twice or more in order to improve the machining accuracy.
(2). Fixing method of insert: The determinant of the method of fixing the insert does not change the precision of the processing, the ease of assembly and decomposition, and the possibility of adjustment. There are four ways to fix the insert: A. fixed by screws, B. fixed by shoulders, C. fixed by toe blocks, and D. upper parts are pressed by plates. The method of fixing the insert of the mother template also adopts the press-fit cooperation. At this time, the slack result caused by the thermal expansion of the processing should be avoided, and the method of preventing the rotation should be designed when the irregular cavity is processed by the circular mold insert.
(3). Considerations for assembly and disassembly of inserts: Inserts and their cavities require high precision for assembly work. In order to obtain adjustment even when there is a slight dimensional error, it is advisable to consider the countermeasures in advance. The specific considerations for the processing of the inserts are as follows: A. There is a press-in introduction, B. The pressing state and the correct position of the piece, the bottom surface of the C insert is provided with a hole for pressing out, D. When the screw is locked, the same size screw should be used for locking and loosening, E. To prevent mistakes in the direction of assembly Should be designed to prevent dull chamfering.
Http://news.chinawj.com.cn Editor: (Hardware Business Network Information Center) http://news.chinawj.com.cn
The concept of unitized design The overall structure of the stamping die can be divided into two parts: (1). Common part (2). The part that changes according to the product. The common part can be standardized or standardized, and the part that changes according to the product is difficult to normalize.
The composition and specifications of the template 1. The composition of the template The composition of the stamping die varies depending on the type and composition of the mold, and there are two types of configurations: the configuration of the configuration and the configuration of the reverse configuration. The former is the most commonly used construction, and the latter is mainly used for extension forming dies or with special dies.
The main tasks involved include:
(1) Digital drawing--converting 3D products and mold models into 2D engineering drawings used in conventional processing;
(2) Digital design of the mold--based on the product model and design intent, establish the relevant 3D solid model of the mold;
(3) Digital analysis and simulation of the mold--structural analysis, thermal analysis, fatigue analysis and motion analysis of the mold according to the product forming process conditions;
(4) Simulation of product forming process - injection molding, stamping;
(5) Customized to fit the company's mold design standard parts and standard design process;
(6) Mold production management.
2. Specifications of the mold (1). The size of the mold and the size of the locking screw template should be larger than the working area, and the standard template size should be selected. The position of the template locking screw is related to the type of mold and the size of the template. Among them, the single engineering mold is most often used in the four corners with the locking screws, and the most standard working area can be widely used. Long molds and continuous molds are most often placed in the four corners and intermediate positions using locking screws.
(2). The thickness of the template is selected in absolute relation to the structure of the mold, the type of stamping, the processing force of the press, and the precision of the press. It is difficult to determine the thickness of the mold according to theoretical calculations. Generally, it is obtained by experience. The thickness of the template used for design should be as small as possible, and the mold height and clamping height should be standardized to facilitate procurement and inventory management.
Template design The main templates of continuous molds include punch fixing plate, pressing plate, mother plate and so on. The structure design depends on the precision of stamping products, the quantity of production, the processing equipment and processing method of the mold, the maintenance method of the mold, etc. The following three forms: (1) monolithic, (2) yoke, (3) inlaid.
1. The monolithic monolithic formwork is also known as the one-piece construction and its machined shape must be closed. The monolithic formwork is mainly used for simple structures or molds with low precision. The processing method is mainly for cutting (no heat treatment is required), and the heat treatment template must be subjected to wire cutting or electric discharge machining and grinding. In the case of a long template size (continuous mold), two or more integrated types will be used.
2. The center portion of the yoke stencil is machined into a groove shape to assemble a block product. The structure depends on the application requirements, and the groove portion can be formed by other templates. The advantages of the yoke formwork are that the groove portion is easy to process, the groove portion width can be adjusted, and the machining accuracy is good. But low rigidity is its shortcoming.
The design considerations for the yoke template are as follows:
(1). The yoke plate structure and the block part are fitted with a middle fit or a light fit. If the press fit is used, the yoke plate will be changed.
(2) The yoke plate and the retaining function of the block parts must have sufficient rigidity to withstand the side pressure and the surface pressure of the block parts. Further, in order to make the yoke groove portion and the block portion tightly combined, the groove portion angle is made into a relief process, and if the yoke groove portion angle cannot be made into a relief process, the block portion must be made into a relief process.
(3). The division of the block parts should take into account the shape of the interior, and the datum must be clarified. In order to prevent deformation during stamping, attention should also be paid to the shape of each block.
(4) When the yoke plate is assembled into a plurality of block-shaped parts, the pitch is varied due to the processing error of the block parts, and the countermeasure is that the intermediate block parts are designed to be adjustable.
(5). The mold structure in which the block parts are combined side by side, the block parts are subjected to the side pressure during the punching process, and a gap is formed between the block parts or the block parts are inclined. This phenomenon is an important cause of poor stamping, punching and chipping, etc., and therefore sufficient countermeasures must be taken.
(6). The fixing method of the block parts in the yoke plate has the following five types according to its size and shape: A. fixed by a locking screw, B. fixed by a key, C. fixed by a key, D. shoulder The part is fixed, E. The above pressing parts (such as the guide plate) are pressed and fixed.
3. The circular or square recess is machined in the inlaid formwork, and the block part is embedded in the formwork. This type of formwork is called the inlaid structure. The structure has less cumulative tolerance, high rigidity, decomposition and grouping. The accuracy of the instant is good. The inlaid formwork structure has become the mainstream of precision stamping dies because of its advantages of easy machining, machining accuracy determined by the working machine, and minimal adjustment. However, the disadvantage is that it requires a high-precision hole machining machine.
When the continuous stamping die is constructed using this formwork, the empty station is designed to make the formwork have high rigidity requirements. The precautions for the inlaid template construction are as follows:
(1). Processing of embedded holes: The vertical hole milling machine (or fixture milling machine), integrated processing machine, fixture boring machine, jig grinding machine, wire cutting electric discharge machine, etc. For the machining standard of the embedded hole, when the wire-cut electrical discharge machine is used, the wire cutting process is performed twice or more in order to improve the machining accuracy.
(2). Fixing method of insert: The determinant of the method of fixing the insert does not change the precision of the processing, the ease of assembly and decomposition, and the possibility of adjustment. There are four ways to fix the insert: A. fixed by screws, B. fixed by shoulders, C. fixed by toe blocks, and D. upper parts are pressed by plates. The method of fixing the insert of the mother template also adopts the press-fit cooperation. At this time, the slack result caused by the thermal expansion of the processing should be avoided, and the method of preventing the rotation should be designed when the irregular cavity is processed by the circular mold insert.
(3). Considerations for assembly and disassembly of inserts: Inserts and their cavities require high precision for assembly work. In order to obtain adjustment even when there is a slight dimensional error, it is advisable to consider the countermeasures in advance. The specific considerations for the processing of the inserts are as follows: A. There is a press-in introduction, B. The pressing state and the correct position of the piece, the bottom surface of the C insert is provided with a hole for pressing out, D. When the screw is locked, the same size screw should be used for locking and loosening, E. To prevent mistakes in the direction of assembly Should be designed to prevent dull chamfering.
Http://news.chinawj.com.cn Editor: (Hardware Business Network Information Center) http://news.chinawj.com.cn
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