Heater Element High-Current Wire Terminal for Water Heaters

Core Product Features

Customized Processing Flow

1. Raw Material Selection & Cutting
   High-quality metal base materials with high electrical conductivity, high plasticity and high mechanical strength (suitable for cold extrusion forming) are selected according to high-current transmission requirements. Precision cutting is completed by CNC cutting equipment to ensure the dimensional accuracy and end flatness of the base material, laying a solid foundation for cold extrusion forming.
2. Cold Extrusion Forming
   As the core process of product processing, the base material is first subjected to surface lubrication and straightening before cold extrusion. Then, customized cold extrusion dies are used to perform plastic forming on the base material through CNC cold extrusion equipment, shaping the special-shaped main structure of the product in one time to ensure structural compactness and dimensional consistency.
3. Precision Machining
   Finish machining is carried out on the blank after cold extrusion forming. CNC lathes, milling machines and other precision equipment are used to complete profile finishing and conductive contact surface processing, eliminating the process allowance of extrusion forming and ensuring the assembly fit between the product and heater elements/wires.
4. Surface Treatment
   Professional surface treatment is applied to the product for the humid operating environment of water heaters, improving the product's corrosion and oxidation resistance, while optimizing the conductivity of the conductive contact surface and reducing contact resistance.
5. Precision Drilling/Tapping
   Precision processing of product assembly holes and threaded holes is completed on demand to ensure the positioning accuracy of holes and meet the fastening requirements of wire crimping and element assembly.
6. Full-Process Inspection
   First article inspection and patrol inspection are conducted after each process. In the finished product stage, dimensional and geometric accuracy inspections are completed by precision testing instruments, and electrical conductivity and structural strength are sampled at the same time to ensure the product meets custom requirements and usage standards.

Key Processing Challenges

1. Design and Forming Control of Cold Extrusion Dies
   The product features a custom non-standard structure, so the cold extrusion die must fully match the special-shaped structural requirements of the product, leading to high design difficulty for the die cavity and demoulding structure. Meanwhile, plastic deformation of the base material during cold extrusion is prone to wrinkling, cracking and dimensional deviation, which imposes stringent requirements on the control of die precision, extrusion pressure and feed speed.
2. Subsequent Machining Adaptation of Cold Extrusion Blanks
   The blank after cold extrusion forming has slight springback deformation and process marks attached to the die on the surface, resulting in high difficulty in finishing the conductive contact surface and fine-tuning the dimensions. Improper treatment will affect the contact accuracy and lead to an increase in contact resistance.
3. Accuracy Control of Conductive Contact Surface Machining
   The contact part between the product and wires/heater elements is a key area for high-current transmission. Under the composite process of cold extrusion + machining, it is necessary to ensure the qualified roughness and flatness of the contact surface, which poses high challenges for the precision machining and accuracy maintenance of this part.
4. Full-Process Control of Dimensional and Geometric Accuracy for Non-Standard Structures
   For the customized special-shaped structure from cold extrusion forming to subsequent machining, dimensional deviations in each process are prone to superposition, which may lead to excessive geometric tolerance, imposing stringent requirements on process coherence and equipment precision.
5. Process Coordination between Cold Extrusion Forming and Surface Treatment
   The surface of the blank after cold extrusion is highly dense. Inadequate pre-treatment cleaning will lead to insufficient bonding force of the surface treatment layer, which is easy to fall off in high-temperature and humid environments, affecting corrosion resistance and electrical conductivity.

Solutions to Challenges

1. Overcoming Die Design and Forming Challenges
   Senior die designers are assigned to conduct 3D die modeling according to the customized product structure. High-hardness and high-wear-resistance die steel is used to make cold extrusion dies, and die precision and service life are improved through precision machining and heat treatment. Before cold extrusion, the base material is precisely lubricated and straightened, and stepless adjustment of extrusion pressure and feed speed is realized through CNC cold extrusion equipment. Process parameters are adjusted in real time according to the plasticity of the base material. Meanwhile, online monitoring of the blank is carried out during extrusion to effectively avoid wrinkling, cracking and dimensional deviation and ensure forming quality.
2. Solving Subsequent Machining Adaptation of Cold Extrusion Blanks
   In view of the springback deformation of cold extrusion blanks, full dimensional inspection of the blanks is completed by special testing equipment before processing, and a personalized machining process route is formulated with precise machining allowance reserved. High-precision CNC machining centers are used for blank finishing, and special cutting tools are matched to eliminate extrusion process marks. At the same time, precise positioning is achieved through tooling fixtures to reduce clamping errors and ensure the dimensional and geometric accuracy of the product after machining meet the standards.
3. Controlling Precision Machining of Conductive Contact Surfaces
   High-precision CNC grinders and precision milling equipment are used for conductive contact surface processing, with strict control of machining feed rate and rotational speed. Combined with the dense structural characteristics of cold extrusion blanks, machining process parameters are optimized to control the roughness and flatness of the contact surface within the optimal range. After processing, surface polishing is conducted to further optimize the conductive effect. Meanwhile, 100% inspection of the contact surface accuracy is carried out by 2D image measuring instruments to prevent unqualified products from entering the next process.
4. Realizing Full-Process Control of Dimensional and Geometric Accuracy for Non-Standard Structures
   Before processing, process decomposition and dimensional traceability of each process are completed for customized drawings, and the dimensional tolerance range of each link of cold extrusion forming and machining is clarified. Automated equipment is adopted for cold extrusion to realize standardized forming, and full CNC equipment is used throughout the subsequent machining to reduce manual operation errors. After each process, key dimension and geometric tolerance inspections are carried out by 3D coordinate measuring machines and 2D image measuring instruments, and process parameters are adjusted in real time to avoid deviation superposition and ensure the final product accuracy meets the standards.
5. Optimizing Process Coordination between Cold Extrusion and Surface Treatment
   After the cold extrusion blanks are machined, multiple precision cleaning processes are added to completely remove oil stains and metal debris on the blank surface through ultrasonic cleaning, high-pressure degreasing and other methods. Surface treatment is carried out immediately after cleaning, and customized electroplating and passivation processes are adopted to precisely control the thickness of the treatment layer and improve the bonding force between the treatment layer and the base material. Adhesion test and temperature resistance test are conducted after surface treatment to ensure the stable corrosion and oxidation resistance of the product in high-temperature and humid environments.

Our Processing Advantages

1. Customized One-Stop Service
   We can complete the customized non-standard design of the product according to customers' water heater heating power, assembly size, operating conditions and other requirements, and optimize the product structure combined with the characteristics of the cold extrusion process. We provide one-stop service from drawing docking, die design, process decomposition to finished product delivery.
2. Advanced Composite Manufacturing Technology
   Equipped with a full set of high-precision CNC cold extrusion equipment, precision machining equipment and professional testing instruments, we master the composite manufacturing technology of cold extrusion + precision machining. The processed products feature dense structure, high strength, high precision and good consistency, which can effectively guarantee the product's electrical conductivity, structural strength and assembly accuracy.
3. Rich Professional Experience
   We have extensive experience in cold extrusion and precision machining of hardware precision accessories, and a profound understanding of the processing conditions and performance requirements of core accessories for home appliances such as water heaters. We can solve various technical difficulties in cold extrusion forming and subsequent processing in a targeted manner and realize process coordination and optimization.
4. Strict Full-Process Quality Control System
   We have established a strict full-process quality control system with rigorous inspection standards for each process from raw material incoming, cold extrusion forming to finished product delivery. We implement full-process traceability of die precision, extrusion parameters and machining dimensions to ensure 100% of the delivered products meet customer requirements.
5. Flexible Production & Perfect After-Sales Service
   We can flexibly adjust the production plan according to the customer's order quantity, catering to both small-batch customization and mass production, with short die manufacturing cycle and high forming efficiency. We also provide perfect after-sales technical support to timely solve relevant problems in the process of product assembly and usage for customers.