2

Precision of Sofa Leg Stampings

Release time：

2024-07-23

Metal stampings are widely used in both consumer and industrial fields, but the requirements for dimensional accuracy vary across different industries and products. In precision sectors such as watches, automobiles, medical devices, and furniture, the dimensional accuracy of metal stampings is especially critical. The production of sofa legs in furniture also involves stamping, and the concept of dimensional accuracy for metal stampings might be unfamiliar to many. Here's a brief introduction.

Precision of Sofa Leg Metal Stampings

The dimensional accuracy of sofa leg metal stampings refers to the difference between the actual size and the nominal size. The smaller the difference, the higher the dimensional accuracy. This accuracy is measured by the tolerance grade, with national standards specifying 20 grades, from IT01 to IT18. The higher the number, the lower the tolerance grade (processing accuracy), the larger the permissible size variation (tolerance value), and the easier the processing.

The dimensional accuracy of sofa leg metal stampings can generally be divided into precision and standard levels. Precision level represents the highest accuracy achievable by stamping processes, while the standard level is the accuracy achieved through economic means. When the mold manufacturing precision is high, the dimensional accuracy of the external dimensions of metal stampings can reach grade IT10, and the internal hole dimensions can reach grade IT9.

Factors Affecting the Dimensional Accuracy of Stampings:

1. The manufacturing precision and assembly process of the sofa leg metal stamping dies.

2. The elastic recovery of the material after stamping.

3. Incidental factors in the production process, such as inaccurate positioning and unstable material properties.

To ensure the dimensional accuracy of stampings, it is necessary to consider these factors comprehensively.

Impact of Die Manufacturing Precision and Quality:

The manufacturing precision and quality of the die directly determine the initial stamping accuracy and the initial error of the stamping. For stampings of medium carbon steel compound stamping dies with material thickness t ≤ 1mm, the burr height of stampings made by die manufactured by electrical discharge wire cutting is relatively high. In contrast, stampings made by dies manufactured using precision grinding processes such as forming grinding or NC and CNC continuous trajectory coordinate grinding not only have high processing accuracy but also have a small surface roughness Ra value, reaching 0.025μm.

Conventional Errors and Die Life of Sofa Leg Stampings:

The conventional error of sofa leg stampings refers to the actual error of the qualified stampings produced from the first to the last grinding of the die. As the number of grindings increases, the size increment caused by the wear of the cutting edge gradually increases, and the stamping error also increases accordingly. When the error exceeds the limit deviation, the stamping will be unqualified, and the die will need to be scrapped.

To avoid the conventional error range of stampings, increase the number of times the die can be ground, and improve the die life, the holes and internal shapes on the stamping should be marked with a one-way positive deviation tolerance, close to or almost equal to the maximum limit size for die making; while the external shape of the stamping should be marked with a one-way negative deviation tolerance, close to or almost equal to the minimum limit size for die making.

Common Pressing Issues in Furniture Hardware

Trends in the Furniture Hardware Market for 2024