look for better plastic gear material

Ericao

stone 发表于 2013-8-27 23:46

                               
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Hello, Ericao,
一般做寿命测试时，需要定义测试方法：
1、负载是多少N.m?

Lots thanks for stone,

our life test is same as your description 6 items.

The life test failure is because the helical gear, not the worm.

We have used the thin worm teeth and the thick helical gear teeth showed as below picture, and have used

PA66+30%GF and PA46+50%GF, but the life test still were not passed completely.

Ericao

Lots thanks for stone.

our life test is same as your description 6 items.

the test failure is because the helical gear, not the worm.

we have used the thin worm teeth and also used the thick helical gear teeth showed as below picture, and

we used PA66+30%GF and PA46+50%GF material, but the life test was still passed completely.

Ericao

Lots thanks for stone.

Our life test method is same as your description6 items.

The life test failure is because the helicalgear, not the worm.

We have used the thin worm teeth and the thick helical gear teeth showed as below picture, and used PA66+30%GF and PA46+50%GFmaterial, but the life test was not still passed completely.

We may prepare to use better material......（but cost question?!）

For the helical gear, we also used the powder sinter material(SMF5040), the worm and the helical gear are normal teeth, but the noise and the life test were not still very perfect, the most of product can pass the life test, there are less ones not to pass the life test.

HOPE to be able to have other better methods(including material,tooth profile,even gear's kind...etc) to reslove the life and the noise of this kind of the worm and the helical gear operation for whole machine to have ideal status, please kindly advise......

stone

Ericao 发表于 2013-8-27 19:31

                               
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The condition for the life test: the motor adds gear system, that is, the machine operates the con ...

Hello, Ericao,
1、建议增大重合度，在你的蜗轮蜗杆设计参数中，重合度比较低，仅为1.5左右，这也是导致塑料斜齿轮强度降低的一个原因。
     一般来说，蜗杆+斜齿轮的设计，重合度要大于2.0；
2、由于蜗杆转速较快，摩擦生热，要选择耐高温的油酯；
3、建议将模数由1.25增大到1.50；
4、建议使用材料EMS GV-5H试一下。

Ericao

Why can I not pass my tag to above?

Ericao

stone 发表于 2013-9-1 00:04

                               
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Hello, Ericao,
1、建议增大重合度，在你的蜗轮蜗杆设计参数中，重合度比较低，仅为1.5左右，这也是导致 ...

Lots and lots thanks for Stone.

1. The pressure angle from 20 degree to 14.5 degree, not only to increase tooth top thichness, but also to

increase contact ratio and overlap ratio;

2. I have used the high_temperature , high_speed, high_pressure gear grease;

3.If using 1.5 module, the middle of worm will be no meat, the shaft diameter of motor is to have limit(10mm);

4.Please ask, what material is EMS GV-5H?

stone

Ericao 发表于 2013-9-3 20:40

                               
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Lots and lots thanks for Stone.

1. The pressure angle from 20 degree to 14.5 degree, not only t ...

Hello, Ericao,
EMS GV-5H是尼龙-6T-50%玻璃纤维，全称NYLON GRIVORY GV-5H，原料商是瑞士EMS-GRIVORY(埃姆斯化学)公司。该材料在高温、高湿条件下具有较强的抗蠕变能力。材料物性见附件图片。
Ericao,你能否提供电机的以下性能：
1、电机的空载转速；
2、电机最高效率点的输出扭矩和输出转速；
3、电机输出最高功率时的输出扭矩和输出转速；
4、电机的最大输出扭矩以及此时的转速；
5、电机的堵转扭矩。

Ericao

stone 发表于 2013-9-4 20:49

                               
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Hello, Ericao,
EMS GV-5H是尼龙-6T-50%玻璃纤维，全称NYLON GRIVORY GV-5H，原料商是瑞士EMS-GRIVORY(埃 ...

Hi,Stone,

I have used PA46+50%GF material, its spec. ought to be smiliar your proposal(EMS GV-5H).Please see below attachment:
Stanyl TW241F10-data sheet.pdf (25.34 KB, 下载次数: 3)

2013-9-7 10:56 上传

点击文件名下载附件

Regarding the motor spec., see below picture:

Welcome any comments.

stone

Ericao 发表于 2013-9-7 11:03

                               
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Hi,Stone,

I have used PA46+50%GF material, its spec. ought to be smiliar your proposal(EMS GV ...

Hello, Ericao,
根据你提供的电机性能参数，计算塑料斜齿轮的输出扭矩及输出转速如下，从计算结果可以看出，当电机输出最大功率时（802.5W），斜齿轮的输出扭矩为11.7N.m, 输出转速为529RPM, 这是较大的扭矩和较高的转速，如果电机输出最大扭矩，此时斜齿轮输出的扭矩更大了，这对于模数仅为1.25的斜齿轮，无论使用任何塑料材料制作，都会存在非常大的扫齿或断齿风险，如果使用金属材料制作斜齿轮，容易产生噪音，并且蜗杆将会很快磨损变薄、变锋利直至失效。所以，我斗胆建议如下：
1、用“蜗杆+蜗轮”传动取代“蜗杆+斜齿轮”传动。
2、将模数由1.25增大到1.5。由于目前你的电机轴外径是10mm，需将蜗杆与电机轴分开制作，然后过盈装配，或者，将 电机轴的外径增大到12mm, 轴的小前段与蜗轮啮合的部份用于制作蜗杆，轴的大后段经机加工到直径为10mm，用于压装矽钢片制作转子，这样电机轴与蜗杆仍然是一个整体。
3、材料仍用你之前使用的PA46+GF50或PA46+GF30。

描述		At  maximum efficency		At  maximum output power		At maximum output  torque
	空载转速	负载扭矩（N.m）	负载转速（RPM）	负载扭矩（N.m）	负载转速（RPM）	负载扭矩（N.m）	负载转速（RPM）
电机输出	27500	0.618	9274	1.093	7428	－－	－－
传动比     （蜗杆头数：z1=3,      斜齿轮齿数：z2=40, i=40/3=13.333）	13.333
传动效率（%）	0.8
第1级传动输出     （蜗杆+斜齿轮传动）	1959	6.592	661	11.7	529	－－	－－

Ericao

stone 发表于 2013-9-7 22:49

                               
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Hello, Ericao,
根据你提供的电机性能参数，计算塑料斜齿轮的输出扭矩及输出转速如下，从计算结果可以看 ...

Hi, Stone,

Our machine has 6 speed setting, almost  the biggest speed setting also doesn't use motor's  maximum output  torque status, in general , the broken teeth should not be able to take place for 1.25 module worm and PA plastice helical gear.only its less product's life can't keep to end abrasion.
Our product's gear box size is to have limit, can't add bigger according to your proposal, and the worm wheel's design ,manufacture and assembly is more truoble than the helical gear.