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Automotive Motor Base MIM Parts

Introduction of MIM car motor base parts

Item	Material	Production Process		Sintering Temperature		Mold	Custom		Performance
Motor base	304L stainless steel	Metal Injection Molding		1350℃-1370℃		To be customized	Yes		Non-magnetic, the bottom surface bears 280kg force
Chemical Composition	C：≤0.03 Si：≤1.0 Mn：≤2.0 Cr：18.0～20.0 Ni :9.0～12.0 S：≤0.03 P:≤0.045
Available Materials	Low carbon stainless steel, titanium alloy (Ti, TC4), copper alloy, tungsten alloy, cemented carbide, high temperature alloy (718, 713)
Mechanical properties	Mechanical properties of 304L stainless steel: Yield strength (N/mm2) ≥ 205 Tensile strength ≥520 Elongation (%) ≥ 40 Hardness HB ≤187 HRB≤90 HV ≤200 Density 7.93 g·cm-3 Specific heat c(20℃)0.502 J·(g·C)-1 Thermal conductivity λ/W(m·°C)-1 (at the following temperature/°C) 20 100 500 12.1 16.3 21.4 Coefficient of Linear Expansion α/(10-6/°C) (Between the following temperatures/°C) 20～100 20～200 20～300 20～400 16.0 16.8 17.5 18.1 Resistivity 0.73 Ω·mm2·m-1 Melting point 1398～1420℃
Finish	Dimensional Accuracy		Product Density		Appearance Treatment			Appropriate Weight
Roughness 1～5μm	（±0.1%～±0.5%）		92～95%		Mirror Reflection			0.03g～400g）

Characteristics of 304 stainless steel

304L Alloy 304L is a T-300 series stainless steel austenitic that contains at least 18% chromium and 8% nickel. Type 304L has a carbon maximum of 0.030. It is standard "18/8 stainless steel" and is commonly used in pans and cooking tools. Alloy 304L is the most versatile and widely used alloy in the stainless steel family. Alloy 304L offers excellent corrosion resistance, ease of manufacture, and excellent formability, making it ideal for a variety of domestic and commercial applications. Austenitic stainless steels are also considered the easiest to weld among high alloy steels and can be welded by all fusion and resistance welding processes.

1. 304L Chemical Composition

0.03max

2.0max

0.75max

0.045max

0.03max

min:18.0
max:20.0

min: 8.0 max:
12.0

0.10
max

304L Mechanical I Performance

Grade

Tensile strength ksi
(min)

Translation 0.2%ksi(min)

Elongation%

Hardness (cloth ratio) MAX

Hardness
(Rockwell
)MAX

304L Physical Properties

Density

Thermal conductivity BU/hf.F)

Resistivity

Oneness modulus
(psi x
10 6

Thermal expansion
(in/in)/Fx10-6

Specific Heat (BTU/lb/F)

Melting range (F)

At 68°F:0.285

9.4 at 212°F

28.3 at 68°F

9.4 at 32-212°F

0.1200 at 68°F to 212°F

2500 to 2590

12.4 at 932°F

39.4 at 752°F

10.2 at 32–1000°F

49.6 at 1652°F

10.4 at 32-1500°F

2. 304L General Properties

Alloy 304L is a T-300 series stainless steel austenitic containing at least 18% chromium and 8% nickel. Type 304L has a carbon maximum of 0.030. It is standard "18/8 stainless steel" and is commonly used in pans and cooking tools. Alloy 304L is the most versatile and widely used alloy in the stainless steel family. Alloy 304L offers excellent corrosion resistance, ease of manufacture, and excellent formability, making it ideal for a variety of domestic and commercial applications. Austenitic stainless steels are also considered the easiest to weld among high alloy steels and can be welded by all fusion and resistance welding processes.

3. 304L Application

304L stainless steel alloy is used in a variety of domestic and commercial applications including: 1. Food processing equipment, especially beer brewing, milk processing and winemaking 2. Kitchen benches, sinks, sinks, appliances and appliances 3. Architectural decoration and styling 4. Automotive and Aerospace Structural Uses 5. Construction Materials for Large Buildings 6. Chemical Vessels, Including Transportation 7. Heat Exchangers 8. Nuts, Bolts, Screws and Other Fasteners in Marine Environments 9. Dyeing Industry 10. For Use Woven or welded screens for mining, quarrying and water filtration.

4、304L corrosion resistance

(1) Corrosion resistance in oxidizing environments is the result of alloy 304 containing 18% to 19% chromium.

(2) Resistance to moderately aggressive organic acids is a result of alloy 304 containing 9% to 11% nickel.

(3) Occasionally, He-Quan 304L can show a lower corrosion rate than high-carbon He-Qu 304; otherwise, 304, 304L and 4.304 can be considered to perform uniformly in most corrosive environments.

(4) 304L alloy is preferably used in a highly corrosive environment to cause intergranular corrosion in welds and heat-affected zones susceptible to the alloy.

5. Heat resistance

Oxidation resistance reaches 1600F for intermittent use and 1690F for continuous use. .If subsequent waterborne corrosion resistance is important, continuous use of 304 in the 800-1580F range is not recommended. The 304L grade is more resistant to carbide precipitation and can be heated to the above temperature range.

6. 304L welding characteristics

Excellent weldability; post-weld annealing is not required when welding thin sections. Two important considerations for producing welded joints in austenitic stainless steels are: maintaining corrosion resistance and avoiding cracking

7. 304L processing - thermoforming

Forging, thermal uniformity is 2100/2300F Do not forge below 1700F Forging can be air cooled without risk of cracking

8. 304L processing - cold forming

(1) Its austenitic structure allows it to be deep drawn without intermediate annealing, making it a grade of stainless steel for making sinks, hollowware and stew pots.

(2) These grades harden quickly. To relieve stress during severe forming or spinning, parts should be fully annealed or stress relieved as soon as possible after forming.

9. 304L machinability

A chip breaker is recommended as the chips can be sticky. Stainless steel rapid work hardening, re-feed, sharp tools and rigid gear should be used. The cut is below the previously passed work hardened layer.

Our Service

Pre-sale

Evaluate according to drawings or products, calculate the price, and submit it to the buyer for confirmation

On sale

The production process of all products is supported by the production system and delivered according to the mutually agreed time. (If the size of the drawing needs to be changed in the middle, the buyer is responsible for the inconsistency with the original drawing. If we fail to meet customer requirements during the modification process, a full refund will be given)

After sales

After handing over the product, we will seal all the buyer's molds for safekeeping.

(Problem solving) If there is a second or third revision in the production process, we will reply within 1 hour at the earliest, and we will solve customer problems within 8 hours at the latest depending on the situation of products that need to be evaluated.

Why Choose US?

Our R&D team	Zhongwei Precision Co., Ltd. and Central South University have a R&D team of 10 people. They develop more than 400 products each year, which is more than 68% higher than the same industry, and have obtained more than 20 patent certificates.
Our technical team	Zhongwei Precision has 5 professional engineers in the field of metal injection molding, and 15 technicians responsible for workshop management.
Our philosophy on quality management	1. Focus on the customer Organizations depend on customers, so organizations should understand customers' current and future needs in order to meet customer requirements and exceed their expectations. 2. Leadership Organizers unify the purpose, direction and internal environment of the organization and create an environment in which employees can fully participate in the achievement of organizational goals. 80% of quality problems are related to management and 20% are related to employees. 3. Full participation Employees at all levels are the foundation of the organization's survival and development, and only with their full participation can they bring benefits to the organization. Job responsibilities include all staff (from general manager to grassroots staff). 4. Process Approach Manage related resources and activities as a process to achieve desired results more efficiently. Flowchart method. 5. A systematic approach to management Identifying, understanding, and managing a system of interrelated processes against set objectives contributes to the effectiveness and efficiency of an organization. The principle of the hoarding of the wooden bucket. 6. Continuous Improvement It is an eternal development goal of the organization. PDCA cycle. 7. A fact-based approach to decision-making: Logical analysis or judgment of data and information is the basis for effective decision-making. Speak with data and facts. 8. Mutually beneficial supplier relationships Enhance the ability of the organization and its suppliers to create value through mutually beneficial relationships.
Device resources	The company has 10 MIM production lines, CNC and intelligent automated production workshops for production lines, which can guarantee the production of millions of MIM parts per day.
System Certification	ISO9001, ISO14001, IATF16949 certification
Port	It is 200 kilometers away from Tianjin Port, and goods can arrive at the port within 24 hours.

Process After Sintering

1. Heat treatment: annealing, carbonization, tempering, quenching, normalizing, surface tempering

2. Processing equipment: CNC, WEDM, lathe, milling machine, drilling machine, grinder, etc.;

3. Surface treatment: anodizing, powder spraying, chrome plating, painting, sandblasting, nickel plating, galvanizing, blackening, polishing, bluing, etc.

Moulds and Inspection Fixtures

1. Mold service life: usually semi-permanent. (except for lost foam)

2. Mold delivery time: 10-25 days, (according to product structure and product size).

3. Tooling and mold maintenance: Zhongwei is responsible for precision parts.

Quality Control

1. Quality control: the defective rate is less than 0.1%.

2. Samples and trial run will be 100% inspected during production and before shipment, sample inspection for mass production according to ISDO standards or customer requirements.

3. Testing equipment: flaw detection, spectrum analyzer, golden image analyzer, three-coordinate measuring machine, hardness testing equipment, tensile testing machine.