接線端子內部的金屬導體是端子的核心零件，它將來自外部電線或電纜的電壓，電流或信號傳遞到與其相配的連接器對應的接觸件上。故接觸件必須具備優良的結構，穩定可靠的接觸保持力和良好的導電性能。由于接觸件結構設計不合理，材料選用錯誤，模具不穩定，加工尺寸超差，表面粗糙，熱處理電鍍等表面處理工藝不合理，組裝不當，貯存使用環境惡劣和操作使用不當，都會在接觸件的接觸部位和配合部位造成接觸不良。

poor contact
The metal conductor in the terminal is the core part of the terminal, which transfers the voltage, current or signal from an external wire or cable to the contact corresponding to the connector to which it is matched. Therefore, the contact parts must have excellent structure, stable and reliable contact force and good electrical conductivity. Because the contact structure is not reasonable, the mold material selection errors, unstable machining dimension tolerance, surface roughness, heat treatment, electroplating and other surface treatment process is not reasonable, improper assembly, storage and operation environment of improper use will be in the contact portions of the contacts and the matched parts caused by poor contact.

bad insulation
The function of an insulator is to keep the contacts in the correct position and to keep the contact between the contact and the contact between the contact and the shell. Therefore, insulation must have excellent electrical performance, mechanical properties and process forming performance. Especially with the widespread use of high-density and miniaturized wiring terminals, the effective wall thickness of insulators becomes thinner and thinner. This is more stringent requirements for insulation materials, injection molding precision and molding process. Due to the presence of metal particles, the insulator surface or inner surface of the dust pollution, flux moisture, organic material precipitates and harmful gas adsorption and membrane fusion to form water film on the surface of ion conductive channel, absorption of moisture, mildew, material aging insulation, can cause leakage, short circuit, low breakdown, poor insulation insulation resistance the phenomenon of.

  絕緣體不僅起絕緣作用，通常也為伸出的接觸件提供精確的對中和保護，同時還具有安裝定位，鎖緊固定在設備上的功能。固定不良，輕者影響接觸可靠造成瞬間斷電，嚴重的就是產品解體。解體是指接線端子在插合狀態下，由于材料，設計，工藝等原因導致結構不可靠造成的插頭與插座之間，插針與插孔之間的不正常分離，將造成控制系統電能傳輸和信號控制中斷的嚴重后果。由于設計不可靠，選材錯誤，成型工藝選擇不當，熱處理，模具，裝配，熔接等工藝質量差，裝配不到位等都會造成固定不良。

fixed bad
Insulators not only provide insulation, but also provide accurate protection for the extended contacts, as well as the function of installation, positioning and locking on the equipment. Fixed bad, light influence contact reliable, cause instant power failure, serious is product disintegration. Refers to the disintegration of terminals inserted in the state, because of the material, design, technology and other causes between the plug and the socket structure caused by unreliable, between pin and Jack is not normal separation, will cause serious consequences of power transmission and signal control interrupt control system. Because of the unreliable design, the wrong material selection, the improper selection of the forming process, the poor quality of the heat treatment, the mold, the assembly, the welding, the assembly is not in place and so on, it will cause the fixed bad.

  此外，由于鍍層起皮，腐蝕，碰傷，塑殼飛邊，破裂，接觸件加工粗糙，變形等原因造成的外觀不良，由于定位鎖緊配合尺寸超差，加工質量一致性差，總分離力過大等原因造成的互換不良，也是常見病，多發病。接線端子的這幾種故障一般都能在檢驗及使用過程中及時發現剔除。

In addition, because the coating peeling, corrosion, scratches, plastic flash, rupture, contact roughness, deformation and other reasons caused by poor appearance, due to positioning and locking with oversize, machining quality consistency is poor, poor exchange total separation excessive force causes, also is a common disease, frequently occurring disease. These faults can be found and eliminated in the process of inspection and use.