Automotive

automotive

This is an automotive equipment housing of a French company,when we got the drawing,we have finished the sample within 3days, and the sample got the customer’s Praise,then we got the mass production order.

Application of Zirconia Ceramic Parts in Auto Parts

Zirconia ceramic structural parts have excellent performance, light structure, good electrical insulation performance, low thermal expansion coefficient, non-magnetic, non-conductive, high speed, low noise, high-temperature resistance, wear resistance, acid, alkali, and salt corrosion. Non-toxic, dimensional stability at high temperature, etc.

Working under harsh lubrication conditions, it has excellent dry running performance, which can just make up for the various deficiencies of metal materials, so it has been widely used in the automotive industry.

In recent years, scientists in the international special ceramics field have developed a large number of zirconia ceramic parts for automobiles after arduous experiments and research, which are summarized as follows:

1. Zirconia ceramic structure sensor

Zirconia ceramics have sensitive electrical performance parameters, and their excellent high-temperature resistance is used as induction heating tubes, refractory materials, and heating elements.

Zirconia ceramic oxygen sensor, as a component for purifying exhaust gas, is used to measure the O2 concentration in automobile exhaust, and then feedback the measured value to the engine air supply and fuel supply system to keep the fuel in a fully burned state. The mechanical performance is very superior during use, which can reduce the heat generated by friction.

2. Zirconia ceramic valve heater

Zirconia has three crystal forms: monoclinic, tetragonal, and cubic crystal phases. At room temperature, zirconia only appears as a monoclinic phase, it transforms into a tetragonal phase when heated to about 1100°C, and transforms into a cubic phase when heated to a higher temperature.

Due to the large volume change when the monoclinic phase changes to the tetragonal phase, and the large volume change in the opposite direction during cooling, it is easy to cause product cracking, which limits the application of pure zirconia in high-temperature fields.

But after adding a stabilizer (generally yttrium oxide is used), the tetragonal phase can be stabilized at room temperature, so there will be no volume change after heating, which greatly expands the application range of zirconia.

In order to make the engine burn completely when starting, inhale air in the engine. The side is equipped with a heating device, that is, a valve heater, to heat the suction air, so that the fuel evaporates and mixes completely. During suction heating, in order to control the temperature and improve the reliability of the device, the barium titanate ceramic PTC zirconia ceramic (thermistor) is used as the valve heater. With the use of ceramic valve heaters, the engine is in a complete combustion state as soon as it starts, so as to achieve the effects of improving thermal efficiency, saving energy, and purifying exhaust.

3. Zirconia ceramic engine

Partially stabilized zirconia ceramics not only have a mechanical strength of 100kg/mm2 but also have a lower thermal conductivity than other materials, only -0.04/cms. In terms of gas turbine engines, in order to achieve the same fuel cost as diesel engines, the inlet temperature of the turbine must be as high as 1350℃ for cars. Zirconia ceramics can endure 50-60℃/S rapid cold and rapid heat for a long time; due to strong mechanical performance, failure The rate is usually below 10-5. In the future, ceramic engines may be made of silicon nitride combined with silicon carbide ceramics or partially stabilized zirconia ceramic materials.

4. Zirconia ceramic sensing element

The car shock absorber is a smart shock absorber that has been successfully developed by using the positive piezoelectric effect, inverse piezoelectric effect, and electrostrictive effect of special zirconia ceramics. This kind of smart shock absorber has the function of recognizing the road surface and being able to adjust itself. It can minimize the vibration of the car on rough roads and make passengers feel comfortable.

In addition to the above four, many devices, parts, and small devices used in automobiles are also made of zirconia ceramics. Such as electronic buzzer, ultrasonic vibrator, heat-absorbing glass, photocell, oil plug ring, oil-water seal, etc. These zirconia ceramic parts have good adhesion to metals and other materials, can be mass-produced, and are inexpensive, and are easy to form industrialized operations. Looking forward to future automotive zirconia ceramic products, broad market demand will be formed.

Example.Gear transmission box

skills requirement

1.Material: HT200.    2.Artificial aging treatment.    3.Unfilled cast fillet R2~R3

1.Part drawing analysis

1) In the figure, the inner hole of ϕ25H7 is parallel to the A surface, and the tolerance is 0.02mm; the B surface is parallel to the A, and the tolerance is 0.02mm.

2) The part material is HT200.

3) Artificial aging treatment.

2.Process analysis

1) The inner hole of ϕ25H7 is parallel to the A surface, and the tolerance is 0.02mm, and the B surface is parallel to the A, and the tolerance is 0.02mm. In order to ensure this requirement, first draw a line, rough mill A, and B, then finish mill A or grind A, ensure that the flatness tolerance of A is within 0.01mm, and then use A as the benchmark, rough boring then fine boring ϕ25H7 Inner hole.

2) When machining the ϕ18H7 inner hole and the ϕ14H8 inner hole, always use the A surface as the reference

Machining process of gear transmission box(Unit: mm)

Part NameBlank speciesMaterialProduction type
Gear transmission boxcastingHT200Small batch
ProcessWork stepProcess contentEquipmentTools, measuring tools, auxiliary tools
10Casting
20aging
30Oil primer
40Scribe: Note that the machining allowance of ϕ25H7 inner hole, ϕ18H7 inner hole, and ϕ14H8 inner hole should be as even as possibleMarking table
50Rough millingVertical milling machine
1Align according to the line, rough mill A surfaceDisc cutter
2rough mill B surfaceDisc cutter
3rough mill C surfaceDisc cutter
4rough mill D surfaceDisc cutter
60Milling, boring, drillingVertical Machining Center
1Finish milling A surface, surface roughness Ra1. 6μmDisc cutter
2Finish milling B surface, surface roughness Ra1. 6μmDisc cutter
3Drill ϕ18H7 inner hole to ϕ16, surface roughness Ra6. 3μmϕ16 Twist drill
4Fine boring ϕ18H7 inner hole to requirement, surface roughness Ra1. 6μmFine Boring Tool
5Drill 4 × ϕ7 holes, surface roughness Ra6. 3μmϕ16 Twist drill
6Countersink ϕ12 hole, surface roughness Ra6. 3μmϕ12 Countersink
70Milling, boringHorizontal machining center
1Finish milling C surface, surface roughness Ra6. 3μmDisc cutter
2Finish milling D surface, surface roughness Ra6. 3μmDisc cutter
3Rough boring ϕ25H7 inner hole to ϕ24Rough boring tool
4Fine boring ϕ25H7 inner hole to requirement, surface roughness Ra1. 6μmFine Boring Tool
5Boring ϕ30 inner hole to the requirement, surface roughness Ra3. 2μmFine Boring Tool
6Drill the inner hole of ϕ14H8 to ϕ12Horizontal machining centerϕ12 Twist drill
7Fine boring ϕ14H8 inner hole to requirements, surface roughness Ra1. 6μmHorizontal machining centerFine Boring Tool
8Boring the inner hole of ϕ20 to the requirement, guaranteeing size 3, surface roughness Ra3. 2μmHorizontal machining centerFine Boring Tool
80BenchworkBench
1Print mark: year, month, sequence number
2Cleaning, deburring, chamfering
90TestInspection station
1Check the size and surface roughness of each part
2Check the parallelism between the inner hole and the bottom surface of ϕ25H7
80BenchworkBench
1Print mark: year, month, sequence number
2Cleaning, deburring, chamfering
90TestInspection station
1Check the size and surface roughness of each part
2Check the parallelism between the inner hole and the bottom surface of ϕ25H7
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