First, the work content of stamping die assembly

The assembly of stamping die is a series of assembly processes in a reasonable process sequence. Different types of stamping dies have different structural composition, complexity and precision requirements, and the specific contents and key points of assembly are also different, but usually they should include the following main contents:

1, cleaning and testing

All stamping die parts must be carefully cleaned before assembly to remove oil stains and various mechanical impurities attached to the internal and external surfaces of the parts. Cleaning is of great significance to ensure the assembly accuracy and quality of stamping die and prolong the service life of stamping die. Especially, it is more important to ensure the assembly quality of precision stamping die.

The assembler of stamping die should also carefully check the main parts before assembly, so as to know which are the key dimensions, which are the matching molding dimensions, the matching accuracy grade of key parts and the surface quality requirements, so as to prevent unqualified parts from being used for assembly and damaging other parts.

2. Fixation and connection

There are a lot of parts fixing and connecting work in the assembly process of stamping die. The connection of stamping die parts can be divided into detachable connection and non-detachable connection. Detachable connection When disassembling interconnected parts, no parts should be damaged. After disassembly, the connection can be reassembled, usually by means of thread and pin connection. The non-detachable connection is non-detachable during the use of the connected parts. Commonly used non-detachable connection methods include welding, riveting and interference fit, and interference fit is the most widely used one.

3. Supplementary processing and polishing of towels during assembly.

Before assembling the stamping die parts, all the geometric dimensions and shapes of the parts are not processed at one time; Some parts need to have a certain margin, and towels will be processed together with other supporting parts in the assembly process. To ensure the consistency of its size and shape. Due to factors such as material or heat treatment and structural complexity, some of them need some supplementary treatment during assembly.

Polishing the molding surface of parts is also an important content in the assembly process of stamping dies. Complex molding surfaces or narrow slits, grooves, tiny blind holes and other local structures need to be polished by assemblers to achieve the final required surface roughness.

4, adjustment and research and development

The assembly of stamping die is not simply to combine all parts together, but to assemble these qualified parts with certain machining errors in an orderly manner according to the structural relationship and functional requirements. Because of the size and shape errors of parts, they need to be constantly adjusted and repaired in the assembly process. Research and matching refers to grinding, scraping or drilling, reaming and grinding related parts. Grinding, scraping and assembling are mainly aimed at the matching table or size in the assembly of molded parts or other fixed and sliding parts to meet the assembly accuracy requirements. Drilling, reaming and grinding are mainly used for matching or connecting assembly of related parts.

5, stamping die action check

After the assembly of all parts of the stamping die is completed, it is necessary to check the movement of all parts or moving parts of the mechanism as a whole according to the functional requirements of the stamping die design, so as to check the requirements of the flexibility of movement, the reliability of the mechanism, the accuracy of the stroke and position, and the coordination of the movement of each part. In addition to the above main contents, the on-site die test of stamping die and the handling, adjustment and modification after die test are also a part of stamping die assembly.

Second, the precision requirements of stamping die assembly

In order to ensure the quality of stamping die and its molded products, the assembly of stamping die shall meet the following precision requirements:

① Die parts should meet certain mutual position accuracy, such as coaxiality, parallelism, verticality and inclination.

(2) The moving parts should have relative motion accuracy requirements, such as the rotation accuracy, rotary motion accuracy and linear motion accuracy of various mechanisms.

③ Orientation and positioning accuracy

Such as moving die and fixed die, opening and closing movement guidance of upper die and lower die, installation and positioning of cavity (female die) and core (male die), and guiding and positioning of sliding movement.

④ Fit accuracy and contact accuracy.

The fit precision mainly refers to the fit clearance or interference degree between the surfaces of mutually matched parts; Such as cavity and core, insert and template hole, guide post and guide sleeve, template and so on. Contact accuracy means that two mating connection surfaces reach the specified contact area and the distribution degree of actual contact points; Such as the uniformity of the contact point of parting surface, the contact area of the inclined plane of locking wedge, etc.

(5) other aspects of accuracy requirements.

Such as the tightness, deformation, lubrication and sealing when assembling the stamping die; As well as the vibration, noise, temperature rise and friction control in the working process of stamping die, which should meet the working requirements of stamping die.

Third, the technical requirements of stamping die assembly

1, appearance technical requirements of stamping die

(1) the edge of each template and the exposed part of the assembled stamping die should be chamfered or rounded, so small as to have burrs and acute angles; All external surfaces shall be free from serious scratches, bulges or dirt; There should also be no embroidery marks or some unprocessed blank surfaces.

(2) according to the working state of the stamping die, installing or lifting the lifting ring at an appropriate balance position of the stamping die; Stamping dies with multiple parting surfaces should be locked by locking plates to prevent the movable template of towels from being damaged due to vibration during transportation.

(3) The overall dimensions, closing height, installation and positioning dimensions, ejection mode and die opening stroke of the stamping die shall meet the requirements of the design drawings and reasonably match the parameters of the equipment used.

(4) Stamping dies shall be marked with serial numbers, and each template shall be marked with serial numbers and processing and assembly reference angles.

⑤ The connecting screws of the moving die and the fixed die of the stamping die shall be firm, and the head shall not be higher than the plane of the template.

⑥ Various auxiliary mechanisms on the appearance of the stamping die, such as hooks, swing rods, locks, cooling water nozzles, hydraulic and electrical components, etc. , should be installed completely, standardized and reliable.

2, stamping die assembly technical conditions

Different kinds of stamping dies have different requirements for the assembly work content and accuracy. In order to ensure the assembly accuracy of stamping die, the national standard stipulates the assembly technical conditions of stamping die, and the specific provisions refer to relevant national standards.