Search This Blog

What are the advantages of CNC machining of radiator parts?

For friends who have been in contact with the radiator component industry, they often see or hear "CNC machining", but too much exposure does not necessarily mean that many people understand. In fact, many questions are still about CNC machining. What are the advantages? Let's take a closer look. CNC machining is an index-controlled machine tool machining, which is a method of using digital information to control the machining process. Traditional mechanical processing is done manually by machine tools. During processing, the mechanical cutter is shaken to cut metal, and the accuracy is measured with calipers and other tools. However, traditional artificial intelligence processing is far from being able to meet the needs of production development. Therefore, the emergence of CNC machining provides the possibility for the standardization, precision and efficiency of mechanical product processing. The CNC machining process in the radiator component industry also shines. The

Investment Casting Materials and Manufacturing Process

Mold material The performance of the molding material should not only ensure the convenient production of investment molds with accurate dimensions and high surface finish, good strength and light weight, but also create conditions for the manufacture of mold shells and good castings. Molding materials are generally formulated with waxes, natural resins and plastics (synthetic resins). All mold materials mainly prepared with wax materials are called wax-based mold materials, and their melting point is low, 60~70 ° C; all mold materials mainly prepared with natural resins are called resin-based mold materials, with a slightly higher melting point, about 70 °C. ~120℃. invest-casting.com   Precision Investment Castings China prototype company service include :  High Quality Investment Casting Parts Custom , Lost Wax Investment Casting Sand Casting , Lost Foam Casting , Gravity Casting , Die Casting , Graphite Casting , Casting Moldsmanufacturers . Manufacture of Folding Investments In t

알루미늄 합금 다이캐스팅의 단점을 해결하는 것이 편리합니다!

알루미늄 합금 다이캐스팅은 현재 현재의 전자제품 , 자동차 , 생활필수품 등 많은 산업과 분야에서 널리 사용되고 있습니다 . 그러나 알루미늄 합금 다이캐스팅에서 자주 발생하는 몇 가지 결함 및 해결 방법은 다음과 같습니다 .   알루미늄 합금 다이캐스팅   1. 불순물   알루미늄 합금 다이 캐스팅의 불순물 문제는 주로 특정 온도에서 알루미늄 , 규소 및 다량의 철 , 망간 , 크롬 및 기타 화합물을 포함하는 결정립과 일부 산화물로 구성됩니다 .   해결책 : 알루미늄 잉곳의 조성을 엄격하게 제어하고 , 제련로의 난로를 정기적으로 청소하고 , 정기적으로 슬래그를 처리하면 문제를 해결할 수 있습니다 .   2. 구강 문제   다공성은 다이캐스팅 부품의 내부 또는 표면에 나타나는 다양한 크기의 구멍을 말하며 , 이는 다이캐스팅 부품의 경도 부족으로 이어져 표면의 외관에 영향을 줍니다 .   Solution: 적절한 정제제를 사용하여 모공을 처리하고 , 공정을 조정하고 , 저속을 적절하게 줄이고 , 이형제가 너무 많이 분사되어 모공 문제가 해결되지 않는지 확인하십시오 .   3. 균열 문제   균열은 알루미늄 합금 다이캐스팅의 매트릭스가 파괴되고 , 외력의 작용에 따라 확장되는 경향이 있는 선형 또는 기타 라인인 기다란 틈이 형성되는 것을 의미합니다 .   솔루션 : 합금 조성을 올바르게 제어하고 , 냉각수 회로를 늘리고 , 알루미늄 합금 다이캐스팅의 구조를 변경하고 , 사출 위치를 변경하거나 증가시키면 해결할 수 있습니다 . PINJIN 서비스에는 다음이 포함됩니다 . 알루미늄 다이캐스팅 , 아연 다이캐스팅 , 마그네슘 다이캐스팅 , 투자 주조 , 모

Processing of cylindrical gear parts with 40Cr straight teeth

This gear is a standard spur gear with modulus m = 3.5 mm, number of teeth z = 63, tooth angle a = 20 & ordm. Since it is a gear of an aircraft steam turbine, its processing accuracy is required to be high.

Forged blanks are chosen because steam turbine gears require a hard tooth surface and a sturdy tooth center. 40Cr is used.

(1) Main technical requirements

  • 1) The accuracy level is set to the first acceptable group with 6 levels of accuracy and the detected item pitch cumulative error ΔFp. The second permissible group is level 5 accuracy, detection item tooth profile error Δff and base section deviation Δfpb. The third acceptable group is level 5 accuracy, which is the tooth orientation error ΔFβ for the detected item. The tooth thickness deviation Wk is measured by measuring the length of the normal. Tooth thickness deviation code M, tooth thickness deviation code P. (In the accuracy level display, the deviation of the tooth thickness limit is used to control the backlash, which is indicated by the code MP).
  • 2) The reference depth of the blank reference plane is the accuracy of IT6. There is a requirement for circular runout of the end face with the inner hole shaft at both ends.
  • 3) Surface roughness Ra The reference hole was 0.8 μm, both end faces were 1.6 μm, the tooth surface was 0.8 μm, and the tooth tip cylindrical surface was 3.2 μm.

(2) Forged blanks are selected to improve the mechanical properties of the material.

Free forging is used for low volume production and mold forging is used for mass production.

(3) The choice of the main surface treatment method for gears has a higher level of accuracy.

The main surface finishing methods are as follows.

  • Reference hole: Grinding
  • End face: Grinding
  • Tooth surface: Hobbing-Surface quenching-Grinding
  • General process for machining aircraft turbine spur gears:Document number for process card product type parts and components

Product name Gear part name Total page

Number Process Content Equipment Quantity Measurement Time Quota Remarks

  • 1, cutting machine 1
  • 2, rough car end face, inner hole and chamfered vertical car
  • 3, blank inspection non-destructive flaw detector
  • 4, rough car mouth, outer chamfer and surface lathe
  • 5, heat treatment (tempering) box furnace
  • 6, fine car inner holes and end face lathe
  • 7. Excavation: Vertical excavation
  • 8. Large end face grinding: surface grinding machine
  • 9, Reaming: Drilling machine
  • 10, pull key: slot broach tool
  • 11. Intermediate inspection: caliper and angle ruler
  • 12. Make a factory standard: Bench Bench
  • 13, rough hobbing: hobbing
  • 14. Fine hobbing: Hobbing
  • 15. Tooth tip treatment: Milling machine
  • 16. Cleaning: Cleaning machine
  • 17. Mid-term test
  • 18, heat treatment (surface hardening): box furnace
  • 19. Finely grind inner holes: inner grinding machine
  • 20, cleaning: cleaning machine
  • 21. Mid-term test
  • 22, Matching: Inspection machine
  • 23, Grinding: Grinding machine
  • 24, Cleaning: Cleaning machine
  • 25, Matching: Inspection machine
  • 26. Write the pairing number
  • 27, Cleaning: Cleaning machine
  • 28. Final test

Design calibration approval

The gearing process generally goes through the following steps: blanking heat treatment, tooth blanking, tooth profile processing, tooth edge machining, tooth surface heat treatment, precision benchmark correction and tooth profile finishing, etc.
The first stage of Cnc Machining is the first stage in which the blank is first machined. Since the transmission accuracy of the gear is mainly determined by the tooth profile accuracy and the uniformity of the tooth pitch distribution, this is directly related to the accuracy of the positioning reference (hole and end face) used when cutting the tooth. Therefore, this stage is mainly to prepare the detailed criteria for processing the tooth shape of the next stage, and the accuracy of the inner hole and the end face of the tooth basically meets the specified technical requirements. In addition to machining the benchmark at this stage, the treatment of small surfaces other than tooth contours should be done as late as possible at this stage.

The second step is the machining of the gear tooth shape.

For gears that do not require quenching, this stage is usually the final machining stage of the gear. After this stage, gears that fully meet the requirements of the drawing must be machined. For gears that require hardening, the precision of the tooth profile required to meet the final finish of the tooth profile must be machined at this stage, so machining at this stage is important to ensure the machining accuracy of the gear. It is a stage.

Particular attention is required.

Tooth tip treatment:

  • A) Inverted circle
  • B) Inverted tip
  • C) Chamfer

The cnc machining method of the gear end of the gear is as follows. There are four methods: inverted circle, inverted point, chamfered edge, and deburring. Chamfering, chamfering, and gear after chamfering. It is easy to engage when moving along the axis. Chamfering the tooth surface is the most widely used. Figure 2 shows the chamfering principle of a finger milling cutter. When rounded, the gear rotates slowly and the finger cutter reciprocates linearly along the gear axis while rotating at high speed. Each time the gear rotates one tooth, the milling cutter reciprocates once and the two ends move relative to complete the rounding of the tooth ends. Before tooth quenching, it is necessary to adjust the treatment of the tooth edges.

The third stage of processing is the heat treatment stage. At this stage, the quenching process of the tooth surface is mainly performed to achieve the specific hardness requirements of the tooth surface.

The final stage of machining is the finishing stage of the tooth profile.

The purpose of this stage is to correct the deformation of the tooth profile caused by gear quenching, further improve the accuracy of the tooth profile, reduce the surface roughness and achieve the final accuracy requirement. At this stage, the positioning reference (holes and end faces) is trimmed first, and after quenching, the holes and end faces inside the gear are deformed. If the hole shape is directly finished using such a hole and the end face after quenching, it is difficult to achieve the accuracy of the gear. The toothed finish by positioning the trimmed reference plane ensures accurate and reliable positioning and a relatively uniform balance distribution to achieve the finishing objectives. It is usually necessary to prepare the tooth tip treatment after hobbing (inserting) the tooth and before quenching the tooth.

The base hole of the gear will be deformed after quenching. The base holes need to be modified to ensure the quality of the tooth profile.

Cylindrical hole gear modifications can be used for push holes or grinding holes, which are highly productive and are often used for uncured gears. Grinding accuracy is high, but productivity is low. For gears with high internal hardness and high hardness after quenching, or gears with large inner diameter and thin thickness, it is recommended to use grinding holes.

When grinding a hole, the gear index circle is usually centered, so the radial runout of the gearing after grinding the hole is small, which is beneficial for later grinding or honing. To increase productivity, some factories have achieved good results by replacing the grinding holes with diamond boring.

Keywords: gear parts processing, 40Cr gear, turbine gear, gear grinding, tooth edge processing, tooth edge inverted circle, gear quenching

Link to this article:Processing of cylindrical gear parts with 40Cr straight teeth

Reprint Statement: If there are no special instructions, all articles on this site are original. Please indicate the source for reprinting.:Cnc Machining,Thank

Contact Us


Get In Touch or Get A Quote

Need an expert? you are more than welcomed to
leave your contact info and we will be in touch shortly
YOUR COMPANY
Sifangyuan Industrial Park, Xinshapu, Huaide Community
Humen town, Dongguan City, Guangdong Province. 
860769-82886112
860769-82886112