PTO PM Sintered Part
Qinhuangdao Zhongwei Precision Parts Co., Ltd. (hereinafter referred to as "Zhongwei Precision") was founded in 1997. It is a well-known domestic expert who focuses on the research and development of powder metallurgy pm and mim processes. It provides customers with various high-precision and complex mechanical hardware parts.
Product Introduction
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PTO PM sintered part |
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Item |
Material |
Production Process |
Sintering Temperature |
Mold |
Custom |
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PTO |
40cr ni |
Powder metallurgy |
1280℃ |
To be customized |
Yes |
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Chemical composition |
quality score（%）： Cr：0.45～0.75 Ni：1.00～1.40 |
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Available Materials |
Low carbon stainless steel, titanium alloy (Ti, TC4), copper alloy, tungsten alloy, hard alloy, high temperature alloy (718, 713) |
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Product advantages
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Smoothness |
Dimensional accuracy |
Product density |
Appearance treatment |
Appropriate weight |
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Roughness 1～5μm |
（±0.1%～±0.5%） |
92～95% |
mirror reflection |
0.03g～400g） |
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Mechanical properties |
Tensile strength (σb/MPa): ≥980 Yield point (σs/MPa): ≥785 Elongation after break (δ5/%): ≥10 Reduction of area (ψ/%): ≥45 Impact absorption energy (Aku2/J): ≥55 Brinell hardness (HBS100/3000) (annealed or high temperature tempered state): ≤241 |
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Heat treatment |
40CrNi belongs to hypoeutectoid steel, which is completely austenitized after heating at 860°C. When it is cooled by normalizing, proeutectoid ferrite is precipitated, and then austenite transforms into pearlite-like structure (lamellar). Due to the fast cooling rate and the small spacing of pearlite sheets, it is easy to obtain sorbite or troostite structures (both of which belong to pearlite in a broad sense). Therefore, the structure is ferrite + pearlite |
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The impact of burrs on products
Qinhuangdao Zhongwei Precision Parts Co., Ltd. (hereinafter referred to as "Zhongwei Precision") was founded in 1997. It is a well-known domestic expert who focuses on the research and development of powder metallurgy pm and mim processes. It provides customers with various high-precision and complex mechanical hardware parts. Powder metallurgy products, and give suggestions according to customer needs, customize overall solutions, help customers improve efficiency and save costs. Contact: Wu Zhenliang. Main business: copper base, iron base, stainless steel, powder metallurgy precision press molding (pm), precision lost wax casting and injection molding (mim), stainless steel and bronze powder porous sintered filter elements, etc.
The technical characteristics of PTO PM sintered part powder metallurgy make it widely used, but the phenomenon of burrs cannot be avoided. We only need to control it within a certain range, otherwise the excessive burrs will have a negative impact on product quality and performance. What is the impact on product quality? Zhongwei Precision Powder Metallurgy technicians will answer for you:
1. Affect the surface quality of the product: burrs affect the surface finish of the product. In the occasions where the surface quality is relatively high, the parts are unqualified. For example, some gear pump side plates cannot be used because the parts are not removed or the burrs are not cleaned. .
2. Affect the assembly performance of the product: For some structural parts with high assembly requirements, due to the existence of burrs, it is easy to cause interference and seizure of matching parts, such as motor bushings, guide sleeves of automobile shock absorbers, bottom valve seats, pistons etc. The presence of burrs directly affects the assembly requirements.
3. Affect the heat treatment performance of the product: when the parts with burrs undergo heat treatment, they are prone to stress concentration and cracks, resulting in a decrease in the fatigue strength of the parts. This cannot be ignored for parts subject to high loads and high-speed movements.
4. Affect the performance of the product: During the operation of the machine, under the action of friction, the burrs are easy to fall off, aggravating wear and causing early failure of parts. In the hydraulic system, the shed burr enters the circuit of the hydraulic system together with the hydraulic oil, which affects the normal operation of the hydraulic system, and crawling and shaking occur.
5. Affect the positioning performance of the product: powder metallurgy mostly adopts longitudinal pressing, and the side forming ability of the product is poor. For parts with holes on the side, machining is often required. The existence of burrs will inevitably lead to positioning errors, which will affect the machining accuracy of the hole. For parts with high precision requirements, burrs must be removed before machining. In addition, burrs also affect the detection accuracy of parts.
The above is about the impact of burrs on the quality of PTO PM sintered par powder metallurgy products. Now, there are many ways to remove burrs. The selection should be combined with the actual production of the factory. The material, burr size and location of the parts should be considered , but also consider the principle and economy of the deburring method.
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