How to choose the automation method of stamping production line?

The automated stamping production lines mainly include: progressive die stamping, multi-station stamping, and tandem stamping. Because of their respective characteristics, they are used to produce different automotive sheet metal parts. With their unique advantages, they are widely used in automotive automation. , plays a huge role in the efficient production system. The characteristics of the three stamping automatic production lines are compared and analyzed, and the selection method of the production line is explained according to their characteristics. Therefore, it is convenient for enterprises to use the characteristics of their own parts for reference in the selection of automatic production lines.

With the rapid development of the automobile industry, the stamping industry of the four major car manufacturing processes has also flourished. In order to adapt to the ever-increasing output, various automated production lines emerge as the times require, and are given different production methods according to the characteristic needs of different products. In order for enterprises to choose different production methods according to their own product characteristics, the article classifies common automatic stamping production lines: progressive die stamping, multi-station stamping, tandem stamping, and briefly analyzes the characteristics and selection methods of each production line.

Selection factors of stamping automatic production line

Generally, the following factors are considered to select the type of stamping production line.

(1) Product material: including material type, forming performance, hardness, etc., to measure the choice of coil or sheet forming.

(2) Material thickness: The tonnage of the stamping machine and the matching form of the feeding mechanism should be selected in conjunction with the material.

(3) Monthly supply and demand: Evaluate production capacity, determine production rhythm, and weigh the selection of automatic line types.

(4) Stamping product volume and modeling difficulty: through modeling complexity and product quality requirements, comprehensively consider the mold design method and the corresponding stamping automated production method.

Common types of stamping automatic production lines

Progressive die stamping production line

(1) Overview: The progressive die stamping automatic production line is a production line that uses progressive die stamping. It is generally composed of an uncoiler feeder, a punching machine, a progressive die, and an automatic blanking line. It realizes the automatic process of uncoiling from coil, flat material belt, oiling material belt, stamping into parts, and collecting finished parts off the assembly line.

The important part: progressive die, which consists of multiple stations, up to more than 20 stations. Each station is connected in sequence to complete different processing contents, generally punching, trimming, turning Edge, shaping, blanking process, etc. A series of different machining contents are completed in one stroke of the punching machine. After one stroke is completed, the feeder moves the material in the downward direction according to a fixed step, so that multiple processes can be completed simultaneously in one reciprocating stroke of the punching machine.

(2) Features: The production cycle of the progressive die stamping automatic production line is relatively high, generally reaching more than 30 times/min.
a. High production efficiency. Progressive die is a multi-task process die. In one set of die, it can include various processes such as blanking, bending and stretching, and has high productivity.

b. Ease of automation. Automatic operation can be realized from loading, feeding, processing and unloading, thereby reducing labor costs, improving production efficiency, and preventing abnormalities caused by inconsistency of manual operations.

c. It can be produced by high-speed punching machine. Depending on the state of the product, a high-speed punch can be considered to achieve higher production efficiency.

d. Operational safety. The progressive press equipment has a safety door, so that the work can improve the utilization rate of materials. The work area is isolated from the personnel operation area to form a relatively closed work area, which provides a safety guarantee for high-speed production. Traditional tandem production lines can achieve higher production efficiency.

e. Save production plant area. One machine tool constitutes the processing part of a production line, which can complete the production of one product, with a small footprint, and at the same time, it simplifies the transportation state inspection of bottom materials and semi-finished products, and has high safety.

f. The material utilization rate is not high. In order to ensure the continuity of the material belt and various requirements, in order to ensure the stability of the feeding, it is generally necessary to ensure the uniform distribution of the process content of each process state, and sometimes a part of the material is sacrificed, so that a higher material utilization rate cannot be achieved.

Multi-station stamping automatic production line

(1) Overview: A production line with multiple (usually 4~5 pairs of molds) independent-station molds placed on a large-tonnage press table, using a destacker or an uncoiling feeder to load the material, and using an automatic feeding rod to transfer the process parts , using automatic conveyor belts to collect off-line products.

(2) Features.

a. The base material can be coil material or sheet material, which has great flexibility and is conducive to improving the utilization rate of materials.

b. Using automatic rod feeding, the punching time is lower than that of the progressive die production line, and higher than the traditional tandem production line, which can achieve higher production efficiency.

c. Loading and unloading sensors, double-material detection, gripping sensors, in-mold sensors, etc. can be added to detect the position and status of the blanks and the parts in production, with high safety.

d. There are higher requirements for the feeding height and stamping direction of the die at each station. In order to ensure the stability of the feeding, it is generally necessary to ensure that the state and process of each process are consistent.

Tandem stamping automatic production line

(1) Overview: Multiple presses are arranged in sequence and connected in series to form an automated production line. A pair of molds (that is, a process in the production process) is placed on the table of each press, and the automatic mechanical arm or robot completes the feeding, the transfer of process parts, and the unloading and packing work.

(2) Features.

a. It has a wide range of applications and can be applied to the production of various stamping parts. It does not have high requirements on the size, shape and plate thickness of the stamping parts. It can be used in the production of large-scale covering parts with great flexibility.

b. The production efficiency is low. Due to the use of the mechanical arm to feed the material, the beat stroke cannot be higher. Compared with the progressive production line and the multi-station production line, the production efficiency is low.

c. Conducive to mold maintenance and debugging, because each mold belongs to each press, the clamping is independent, the working parameters are independent, and the maintenance and debugging of each mold process can be carried out independently without affecting each other.

d. It occupies a large area of the production plant. A traditional series production line generally includes 4 to 5 presses, covering a large area.

Selection and application of stamping automatic production line

Progressive die stamping automatic production line: According to the process characteristics of each process distributed on an overall material belt and the attainable high process punching times, it can be applied to the production of small parts on the body, and can meet a high supply volume.

Multi-station stamping automatic production line: It can be applied to the rapid production of medium-sized parts, beam parts that are not easily deformed, symmetrical parts with complex left and right common mold shapes, and products that can be clamped by the gripper on the automatic rod. The production of the automatic line.

Tandem stamping automatic production line: Because each process is independently distributed in each press, the production line is highly flexible and suitable for large-scale covering parts with complex production processes, which is conducive to the debugging and independent production of a single process, and is convenient for high-demand quality control of products. .