Stamping process and die design is an important technology for stamping production preparation. Stamping process and die design should be in combination with the practical situation of factory equipment, personnel and so on, from the quality of the parts, production efficiency, production cost, labor intensity, the protection of the environment and the safety of the production of various aspects of the comprehensive consideration, choose and design the advanced technology, reasonable in economy, and the use of safe and reliable technique scheme and die structure, to make the stamping production in the guarantee which is put forward on the design drawings of the technical requirements, on the basis of reduce stamping process cost and ensure safety in production.

Generally speaking, the main content of the design and steps include:

The ___________ process design

(1) parts and stamping manufacturability analysis Based on the analysis of stamping product figure, stamping characteristics of the shape, size, accuracy requirements, raw material specification and mechanical performance, and the combination of stamping equipment specification and mould manufacturing conditions, factors such as the production batch, manufacturability analysis of stamping parts. Good stamping manufacturability should guarantee the material consumption, less number of process, occupy less equipment, mould structure is simple and high service life, stable product quality, simple operation.

(2) determine the process scheme, main technical parameters are calculated on the basis of the stamping manufacturability analysis, find out the characteristics of the technology and die design and the difficulty, according to the actual situation proposed a variety of possible stamping process plan, the content including the nature of the process, the number of working procedure, operation sequence and combination. Sometimes the same kind of stamping parts there are likely to be more feasible stamping process plan, usually each have advantages and disadvantages, each solution from product quality, production efficiency, equipment usage, mold manufacturing and life expectancy to the difficulty of the high and low, production cost, convenient operation and comprehensive analysis and comparison are made on the aspects such as security degree, the best way to identify suitable for existing production conditions. In addition, understanding the role of parts and use requirements of parts stamping process and die design process parameters is helpful refers to the data, which is the basis of the formulation process such as all kinds of shape coefficient (deep drawing, bulging coefficient, etc.), parts development size and the cutting force and forming force, etc. There are two kinds of calculation,

The first is the process parameters can be calculated more accurately, such as the layout of parts material utilization, blanking pressure center, workpiece size, etc.;

The second is technical parameters can only be approximate calculation, such as general bending or deep drawing force, complex parts blank development size, etc., determine the process parameters are generally roughly calculated according to the empirical formula and chart, some adjustment by test; Sometimes no empirical formula can be used, or because of too many computing that could not be, such as the rigidity and intensity of complex mold parts, computation of complex stamping parts forming force, this kind of circumstance usually can only estimate by experience.

(3) choose stamping equipment According to the nature of the stamping process to be completed and can force characteristics of various kinds of stamping equipment, consider stamping processing required for the work of deformation force, deformation and die closed main factors such as the size of the height and contour, combines the condition of existing factory equipment to reasonable selected equipment type and tonnage. Common stamping equipment such as crank press, hydraulic press, among them the most widely used crank press. Cutting class stamping process in crank presses, generally don't use hydraulic press; Kind of stamping and forming process can be conducted on crank press or hydraulic press.

This mold design mold design includes the choice of the form of the die structure and design, mold structure parameter calculation, mold figure drawing, etc.

(1) the choice of the form of the die structure and design According to the scheme of the proposed process, consider the shape characteristics of stamping parts, parts size, the precision requirement, production batch, mould processing conditions, convenient operation and safety requirements, and other forms of selected and the die structure design.

(2) die structure parameters are calculated to determine the mould structure form, the need to calculate or check the related parameters of die structure on, such as the working parts of die (convex and concave die, etc.) of geometry size, strength and stiffness of mold parts, mold movement parameters of the moving parts, mold and equipment installation size, between the elastic component selection and accounting, etc.

(3) map mold mold figure is the ultimate sign of stamping process and die design results, a set of complete mould figure should include complete information of mould and the use of mould. Mould figure drawing should conform to the national drawing standards, at the same time, considering the special requirements of mold industry and habits. Mould figure consisting of assembly diagram and non-standard part drawing. General assembly drawing mainly reflects the whole mold assembly relation between parts, should be drawn corresponding projection drawing of mould structure, mainly is the main view and necessary section, and the vertical sections, and indicate the main structure dimensions, such as height, dimensions, etc. Used by lower die parts on the vertical projection and, at the same time to the upper right corner of the painting work pieces in drawings, layout diagram, the lower list schedule of mold parts, specify the technical requirements, etc. General according to part drawing mould of surveying and mapping, the general assembly drawing should also have enough projection the necessary profile, sectional view to express clearly parts structure. In addition, to label parts processing all the structure size, tolerance, surface roughness, heat treatment and other technical requirements. For a complete production process and stamping process and die design is inseparable, touch on each other and influence each other, so the foregoing overseers may need to cross and repeated. If the plan have change, is to design and calculation.

C. write process documents and design calculations in order to standardize the production specification, and strengthening management, each kind of stamping products shall write the relevant process documents (e.g., process CARDS). For the parts stamping process and die design should write design specifications, for future reference. Design specification should include the stamping technology analysis and die design of the main content. Stamping die is the main process equipment, stamping processing of stamping parts is depends on the relative motion of upper and lower die to complete. Process due to the constant between upper and lower mould, if the operator's fingers to enter or stay in the mold closed area constantly, it can bring about serious threat to their personal safety.

(a) the mold parts, main functions and safety requirements

1. Intensive work parts is make blank forming parts directly, therefore, it is the key of the mold parts. Intensive not only precise and complex, it should meet the following requirements:

(1) should have sufficient strength, can not be in the process of stamping rupture or damage;

(2) the proper requirements, materials and heat treatment to prevent the high hardness and brittleness.

2. The positioning parts positioning parts is to determine the installation position of ware parts, a positioning pin (plate), block pin (plate), guide pin, guide plate, distance side knife, lateral pressure and etc. Design positioning parts should be considered when convenient operation, should not have been positioning, position to facilitate observation, had better use top presumption and the orientation of outer profile and guide pin, etc.

3. Pressure, discharge pressure and discharging parts material parts have pressure to coil, pressure plate, etc. Circle of drawing blank pressurized pressure side force, thus preventing blank in tangential stress arch under the action of a form wrinkles. The role of the pressure plate is to prevent the stock movement and jumping. Ejection device, the role of the stripper plate is easy to out and clean up waste. Them by the springs, rubber and air cushion on the push rod support equipment, can be up and down, out a design should have enough cap, sport should be limited. Stripper plate should as far as possible to reduce the closed area or in the operating position on milling groove empty-handed. Around the stripper plate of exposure should be equipped with protective plate, prevent into or foreign body into the finger, the exposed surface edges should be blunt.

4. Guide parts guide pillar and guide bush is the most widely used a guide parts. Its role is to ensure that intensive on the punching precision fit clearance. Therefore, guide pin, guide sleeve, small clearance should be made the cutting clearance. Under the guide pin in mold base, to ensure that in stroke bottom dead center, the guide pillar on end at the top of the template above at least 5 to 10 mm. Guide post should be arranged in away from the module and the part of the pressure plate, make the operator's arm without over the guide pin to send material.