阅读说明：本技术 涡轮轴悬臂音轮的制造方法 (Method for manufacturing turbine shaft cantilever tone wheel ) 是由 袁贺玲 苏海兵 叶建华 平晟源 王智超 于 2020-04-30 设计创作，主要内容包括：本发明提供一种涡轮轴悬臂音轮的制造方法,通过改变加工走刀路径减小加工振动和加工抗力以保证产品质量。本发明的方法在加工过程中,克服零件结构引起的刚性差的缺陷有效避免了非基准面定位带来的累计误差,减小了零件加工变形,提高了加工精度和加工零件的合格率,以解决目前加工过程中极易变形导致的产品合格率低的技术问题。(The invention provides a manufacturing method of a turbine shaft cantilever tone wheel, which reduces machining vibration and machining resistance by changing a machining feed path so as to ensure the product quality. In the processing process, the method overcomes the defect of poor rigidity caused by the structure of the part, effectively avoids accumulated errors caused by non-reference surface positioning, reduces the processing deformation of the part, improves the processing precision and the qualification rate of the processed part, and solves the technical problem of low product qualification rate caused by high deformation in the current processing process.)

1. A manufacturing method of a turbine shaft cantilever tone wheel comprises a big end and a small end, wherein the big end comprises 4 cantilevers; it is characterized by comprising:

clamping a part bar by using a numerical control lathe device, roughly turning the inner diameter and the outer diameter of the part to enable the inner diameter and the outer diameter of the part to be left with a margin of 0.4mm, enabling the machining precision of the outer diameter of the small end of the part to reach 0.03mm, and cutting the part from the bar;

turning the large end face of the part by adopting a numerical control lathe device, and ensuring that the planeness of the large end face is less than 0.01mm and the parallelism of the small end face is less than 0.03 mm;

grinding the large end face of the part to ensure that the planeness of the large end face is less than 0.005 mm;

fourthly, an internal grinding machine is adopted, the large end face of the part is sucked by a sucking disc, and the small end face and the inner diameter of the small end are ground, so that the size precision of the inner diameter of the small end is within the range of 0.01mm-0.015mm, and the cylindricity of the inner diameter of the small end is less than or equal to 0.008 mm;

fifthly, positioning the part by adopting a taper mandrel, and grinding the outer diameter by using a cylindrical grinder to ensure that the dimensional tolerance of the outer diameter is not more than or equal to 0.02mm, and the runout of the shaft diameter of two steps of the outer circle to the small reference end face and the inner diameter is respectively within 0.02 mm;

sixthly, positioning by using the inner diameter, and milling the cantilevers uniformly distributed along the circumference by adopting machining center equipment;

seventhly, adopting internal grinder equipment, sucking the large end face by using a sucking disc, and grinding the inner diameter of the small end to ensure that the dimensional tolerance of the inner diameter of the small end is less than or equal to 0.012mm and the cylindricity is within 0.005 mm; the verticality of the small end face to the inner hole is 0.015mm, and the coaxiality to the outer diameter is 0.03 mm;

eighthly, positioning the inner diameter, grinding the outer diameter of the small end by adopting a plunge type grinding method by adopting a cylindrical grinder, and then grinding the outer diameter of the cantilever in a reciprocating manner by adopting a longitudinal grinding method, so that the part meets the design requirements of the outer diameter size precision of 0.008mm and the reference run-out of the inner hole and the small end face of less than or equal to 0.015 mm;

and step nine, grinding the width of the cantilever by using a small surface grinder to ensure that the dimensional tolerance precision of the cantilever reaches 0.02mm and the symmetry degree of the inner diameter reaches 0.03 mm.

2. The method according to claim 1, wherein the rotating speed of the part in the step eight is 10000/(pi x D), the feed back draft of the grinding wheel of the cylindrical grinding machine is 0.005mm, and the longitudinal feed of the grinding wheel is in the range of (50 mm-100 mm)/min; wherein D is the outer diameter of the large end of the part.

3. The method of claim 1, wherein the eighth step is a positioning and clamping method using a tapered mandrel.

4. A method according to claim 3, wherein the small end of the tapered mandrel is threaded through the large end of the internal diameter of the part when the tapered mandrel locating and clamping method is used.

5. The method according to claim 4, wherein the small end face and inner diameter allowance in the fourth step is: the allowance of the small end face is 0.1mm, and the allowance of the inner diameter is 0.2 mm.

6. The method as claimed in claim 5, wherein the flatness of the small end face is less than or equal to 0.005mm and the parallelism of the large end face is less than or equal to 0.02mm in the fourth step.

7. The method according to claim 6, wherein the allowance for semi-refining the outer diameter in the fifth step is specifically: the external diameter is left with a margin of 0.2 mm.

8. The method according to claim 7, wherein the margin for milling the 4 cantilevers in the sixth step is specifically: the single-side width dimension of the cantilever is left with the allowance of 0.15 mm.

Technical Field

The invention belongs to the technical field of machinery, and particularly relates to a manufacturing method of a turbine shaft cantilever tone wheel.

Background

The cantilever structure part is easy to machine and deform, and is generally recognized as a part with larger machining difficulty, in particular to a turbine shaft cantilever tone wheel. When the tone wheel rotates along with the turbine shaft, the cantilever generates an alternating electromagnetic field, and then the pulse signal is converted, so that the rotating speed and the torque of the turbine shaft of the aircraft engine are measured. Therefore, the requirements on the structural size precision and form and position tolerance of the tuning wheel are high in design, and the machining difficulty is high.

In the fine machining process of the tone wheel, a grinding wheel is needed to grind the cantilever of the tone wheel. Because the tone wheel parts are small in size, and the cantilever occupies 1/2 of the total length of the tone wheel, the tone wheel is generally ground by using the incised hair, but the tone wheel structure is poor in rigidity and easy to deform, the tolerance precision of the outer diameter of the cantilever needs to be 0.008, and the inner hole is jumped by 0.018, so that the cantilever can be squeezed to generate elastic deformation during grinding.

Disclosure of Invention

The invention provides a manufacturing method of a turbine shaft cantilever tone wheel, which reduces processing vibration and processing resistance by changing a processing feed path and improves product quality.

The invention provides a manufacturing method of a turbine shaft cantilever tone wheel, which is applied to the processing process of the tone wheel, wherein the tone wheel comprises a large end and a small end, and the large end comprises 4 cantilevers; the method comprises the following steps:

clamping a part bar by using a numerical control lathe device, roughly turning the inner diameter and the outer diameter of the part to enable the inner diameter and the outer diameter of the part to be left with a margin of 0.4mm, enabling the machining precision of the outer diameter of the small end of the part to reach 0.03mm, and cutting the part from the bar;

turning the large end face of the part by adopting a numerical control lathe device, and ensuring that the planeness of the large end face is less than 0.01mm and the parallelism of the small end face is less than 0.03 mm;

grinding the large end face of the part to ensure that the planeness of the large end face is less than 0.005 mm;

fourthly, an internal grinding machine is adopted, the large end face of the part is sucked by a sucking disc, and the small end face and the inner diameter of the small end are ground, so that the size precision of the inner diameter of the small end is within the range of 0.01mm-0.015mm, and the cylindricity of the inner diameter of the small end is less than or equal to 0.008 mm;

fifthly, positioning the part by adopting a taper mandrel, and grinding the outer diameter by using a cylindrical grinder to ensure that the tolerance of the outer diameter is not more than or equal to 0.02mm, and the runout of the shaft diameter of two steps of the outer circle to the small reference end face and the inner diameter is respectively within 0.02 mm;

sixthly, positioning by using the inner diameter, and milling the cantilevers uniformly distributed along the circumference by adopting machining center equipment;

seventhly, adopting internal grinder equipment, sucking the large end face by using a sucking disc, and grinding the inner diameter of the small end to ensure that the dimensional tolerance of the inner diameter of the small end is less than or equal to 0.012mm and the cylindricity is within 0.005 mm; the verticality of the small end face to the inner hole is 0.015mm, and the coaxiality to the outer diameter is 0.03 mm;

eighthly, positioning the inner diameter, grinding the outer diameter of the small end by adopting a plunge type grinding method by adopting a cylindrical grinder, and then grinding the outer diameter of the cantilever in a reciprocating manner by adopting a longitudinal grinding method, so that the part meets the design requirements of the outer diameter size precision of 0.008mm and the reference run-out of the inner hole and the small end face of less than or equal to 0.015 mm;

and step nine, grinding the width of the cantilever by using a small surface grinder to ensure that the dimensional tolerance precision of the cantilever reaches 0.02mm and the symmetry degree of the inner diameter reaches 0.03 mm.

Optionally, the rotating speed of the part in the step eight is 10000/(pi × D), the feed back bite of the grinding wheel of the cylindrical grinding machine is 0.005mm, and the longitudinal feed of the grinding wheel is within the range of (50 mm-100 mm)/min; wherein D is the outer diameter of the large end of the part.

Optionally, in the step eight, a taper mandrel positioning and clamping method is adopted.

Optionally, when the taper mandrel positioning and clamping method is adopted, the small end of the taper mandrel penetrates through the large end of the inner diameter of the part.

Optionally, the small end face and the inner diameter allowance in the fourth step are specifically: the allowance of the small end face is 0.1mm, and the allowance of the inner diameter is 0.2 mm.

Optionally, the planeness of the small end surface in the four steps is less than or equal to 0.005mm, and the parallelism of the large end surface is less than or equal to 0.02mm

Optionally, the allowance when the outer diameter is semi-refined in the fifth step is specifically as follows: the external diameter is left with a margin of 0.2 mm.

Optionally, the allowance when the cantilever at the position 4 is milled in the sixth step is specifically as follows: the single-side width dimension of the cantilever is left with the allowance of 0.15 mm.

According to the manufacturing method of the turbine shaft cantilever tone wheel, provided by the invention, the clamping force is reduced and controlled by changing a positioning and clamping method, so that the clamping deformation is reduced; and the machining vibration and the machining resistance are reduced by changing the machining feed path, so that the product quality is finally ensured. In the processing process, the method overcomes the defect of poor rigidity caused by the structure of the part, effectively avoids accumulated errors caused by non-reference surface positioning, reduces the processing deformation of the part, improves the processing precision and the qualification rate of the processed part, and solves the technical problem of low product qualification rate caused by high deformation in the current processing process.

Drawings

FIG. 1 is a schematic flow chart of a method for manufacturing a turbine shaft cantilever tone wheel according to the present invention;

FIG. 2 is a schematic structural view of a turbine shaft cantilever tone wheel provided in the present invention;

fig. 3 is a schematic diagram of a positioning method of a tone wheel provided by the present invention.

Detailed Description

Fig. 1 is a schematic flow diagram of a manufacturing method of a turbine shaft cantilever tone wheel provided by the present invention, fig. 2 is a schematic structural diagram of a turbine shaft cantilever tone wheel provided by the present invention, and referring to fig. 1 and fig. 2, a specific method adopted by the present invention includes:

clamping a part bar by using a numerical control lathe device, roughly turning the inner diameter and the outer diameter of the part to enable the inner diameter and the outer diameter of the part to be left with a margin of 0.4mm, enabling the machining precision of the outer diameter of the small end of the part to reach 0.03mm, and cutting the part from the bar;

step two, semi-finish turning the large end face: turning the large end face (namely a cut surface) of the part by adopting a lathe, and ensuring that the flatness of the large end face is 0.01mm and the small end face is parallel to 0.03 mm;

step three, grinding the large end face: grinding the large end face of the part to ensure that the flatness of the large end face is 0.005 mm;

step four, semi-finish grinding the small end face and the inner diameter: an internal grinding machine is adopted, the large end face is sucked by a sucking disc, the small end face and the inner diameter are ground, the inner diameter is enabled to leave a fine grinding allowance of 0.1mm, the dimensional accuracy of the inner diameter is guaranteed to reach 0.01-0.015mm, and the cylindricity of the inner diameter is less than or equal to 0.008 mm; the planeness of the small end face is less than or equal to 0.005, and the parallelism of the large end face is less than or equal to 0.02mm, so that the next working procedure can be better positioned;

step five, semi-fine grinding of the outer diameter: positioning a part by adopting a taper mandrel, grinding the outer diameter by using a cylindrical grinder, and keeping the outer diameter with a fine grinding allowance of 0.1, wherein the dimensional tolerance is not more than or equal to 0.02mm, and the runout of the shaft diameter of two steps of the outer circle to the small end face and the inner diameter of the reference is required to be within 0.02mm respectively;

step six, milling the cantilever at the position 4: the inner circle is used for positioning, the machining center equipment is used for milling four cantilevers which are uniformly distributed along the circumference, and the length, the width and the R angle of the cantilever required by a drawing are guaranteed. A margin of 0.15mm is left on a single side of the width for fine grinding;

step seven, fine grinding the inner diameter: an internal grinding machine is adopted, the large end face is sucked by a sucking disc, the inner diameter of the small end is ground, the final dimensional tolerance of the inner diameter is less than or equal to 0.012mm, and the cylindricity is within 0.005 mm; the verticality of the small end face to the inner hole is 0.015mm, and the coaxiality to the outer diameter is 0.03 mm;

step eight, fine grinding the outer diameter: and similarly, positioning the inner circle, positioning and clamping by using an external grinding machine and a taper mandrel, and grinding the outer diameter of the small end by using a plunge type grinding method and then grinding the outer diameter of the cantilever in a reciprocating manner by using a longitudinal grinding method. Ensuring the outer diameter size and form and position tolerance to meet the final design requirement;

optionally, when the taper mandrel positioning and clamping method is adopted, the small end of the taper mandrel penetrates through the large end of the inner diameter of the part. Exemplarily, fig. 3 is a schematic view of a positioning method of a tone wheel provided by the present invention, and a taper mandrel positioning clamp is shown in fig. 3.

Step nine, fine grinding the cantilever: a small-sized surface grinding machine is adopted to grind the width of the cantilever, the dimensional tolerance precision of the cantilever is guaranteed to reach 0.02mm, and the symmetry degree of the inner diameter reaches 0.03 mm.

Step ten, cleaning the parts.