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联轴器正确德拆装方式及注意事项

发布时间:2020-02-07 点击数:49

联轴器的装拆方法

联轴器的组装是机械维护中相对简单的维护过程。关键在联轴器组装

掌握轮毂在轴上的组装,通过联轴器连接的两个轴的对齐,零件的检查和图纸要求

联轴器和其他连杆的组装。

1)轮毂在轴上的组装方法

当轮毂组装在轴上时,联轴器安装的关键之一。轮毂和轴之间的配合主要是过盈配合。

该连接分为键连接和非键连接。轮毂轴孔分为圆柱轴孔和锥形轴孔。

式。组装方法包括静态压制方法,动态压制方法,温差组装方法和液压组装方法。

(1)静压法

此方法基于使用夹具,千斤顶,

使用手动或电动压力机。静压法通常用于锥形轴孔。由于采用静态压入方法而收到

由于压力机械的限制,当干扰较大时,很难施加较大的力。同时,在按

轮毂和轴之间的配合面上的凹凸不平将被切除,从而损坏配合面。所以这

该方法通常未被广泛使用。

(2)动态推入法

此方法是指使用冲击工具或机械来完成轮毂到轴的组装过程,通常在轮毂中使用

与轴的配合使过渡配合或较小的干扰场合。通常在组装现场用手锤击打方块

该方法是将木块,铅块或其他柔软的材料放置在轮毂的端面上作为缓冲部件。

冲击力敲打轮毂。此方法用于制造脆性材料,例如铸铁,淬火钢和铸造合金。

不适合使用的车轮型号可能会造成局部损坏。这种方法也会损坏配合面。

通常用于低速和小型联轴器的组装。

(3)温差组装方法

加热方法是加热轮毂以使其膨胀或通过冷却使轴端冷却并收缩而形成轮毂轴孔。

内径略大于轴端的直径,即达到所谓的“易组装值”,而无需施加很大的力

您可以轻松地将轮毂安装在轴上。与静态压制法和动态压制法相比,该方法具有许多优点。

要点,对于由脆性材料制成的车轮模型,温差组装方法非常适合。

温差装配法大多采用加热法,而冷却法则比较少见。加热的方法很多

有些将轮毂放在高闪点的油中以进行油浴加热或喷灯烘烤,还有一些使用烤箱加热。

大多数组装场所都使用油浴加热和喷枪烘烤。油浴可达到的最高温度取决于油的性质

质量,通常低于200℃。通过其他方法加热轮毂时,轮毂的温度可能会高于200C。

但是,从金相及热处理的观点出发,不能任意地提高轮毂的加热温度,并且钢的再结晶温度也不能提高。

是430C。如果加热温度超过430℃,会导致钢的内部结构发生变化,因此加热

温度上限必须小于430C。为了保险起见,加热温度的上限应为400℃以下

下。至于轮毂的实际加热温度,可以基于轮毂和轴的干涉值以及轮毂加热后的温度。

计算出对轴的要求。

(4)组装后检查

将联轴器的轮毂组装到轴上后,应仔细检查轮毂和轴的垂直度和同轴度。通常

在轮毂的端面和外圆上设置了两个千分表。旋转曲柄时,观察轮毂的整个跳动(包括

(包括端面跳动和径向跳动)以确定轮毂和轴的垂直度和同心度。不同

速度联轴器要求完全跳动使用不同的值,而不同类型的联轴器则需要完全跳动使用不同的值。

但是,将轮毂组装到轴上之后,车轮的整个跳动偏差必须在设计要求之内。

在公差范围内,这是联轴器装配的主要质量要求之一。

Assembly and disassembly method of coupling

The assembly of the coupling is a relatively simple maintenance process in mechanical maintenance. The key is in coupling assembly

Master the assembly of the hub on the shaft, the alignment of the two shafts connected by the coupling, the inspection of the parts and the drawing requirements

Assembly of couplings and other connecting rods.

1) Assembly method of the hub on the shaft

When the hub is assembled on the shaft, one of the keys to the coupling installation。 The fit between the hub and the shaft is mainly an interference fit。

The connection is divided into a key connection and a non-key connection. The hub shaft hole is divided into a cylindrical shaft hole and a tapered shaft hole.

formula. The assembly methods include static pressing method, dynamic pressing method, temperature difference assembly method and hydraulic assembly method.

(1) Static pressure method

This method is based on using clamps, jacks,

Use a manual or electric press. Hydrostatic method is usually used for tapered shaft holes. Received due to static push-in method

Due to the limitation of the press machinery, it is difficult to apply a large force when the interference is large. At the same time, pressing

The uneven surface on the mating surface between the hub and the shaft will be cut off, thereby damaging the mating surface. So this

This method is usually not widely used。

(2) Dynamic push method

This method refers to the use of impact tools or machinery to complete the hub-to-shaft assembly process, usually used in hubs

Cooperate with the shaft to make transition fit or less interference occasions。 Usually hit the block with a hammer at the assembly site

The method is to place wooden blocks, lead blocks or other soft materials on the end face of the hub as a cushioning component.

The impact hit the wheel. This method is used to make brittle materials such as cast iron, hardened steel and cast alloys.

Unsuitable wheel models may cause local damage. This method can also damage mating surfaces.

Usually used for assembly of low speed and small couplings。

(3) Temperature difference assembly method

The heating method is to heat the hub to expand it or to cool and shrink the shaft end by cooling to form the hub shaft hole.

The inner diameter is slightly larger than the diameter of the shaft end, that is to say the so-called "easy assembly value" without applying a large force

You can easily mount the hub on the shaft。 Compared with the static pressing method and the dynamic pressing method, this method has many advantages。

The point is that for wheel models made of brittle materials, the temperature difference assembly method is very suitable.

The temperature difference assembly method mostly adopts the heating method, and the cooling method is relatively rare. There are many ways to heat

Some put the wheels in oil with high flash point for oil bath heating or torch baking, and some use oven heating.

Most assembly sites use oil bath heating and spray gun baking。 The highest temperature that the oil bath can reach depends on the nature of the oil

Quality, usually below 200 ° C. When the hub is heated by other methods, the temperature of the hub may be higher than 200C.

However, from the viewpoint of metallography and heat treatment, the heating temperature of the hub cannot be arbitrarily increased, and the recrystallization temperature of steel cannot be increased.

It's 430C。 If the heating temperature exceeds 430 ° C, the internal structure of the steel will change, so heating

The upper temperature limit must be less than 430C。 For safety reasons, the upper limit of the heating temperature should be below 400 ° C。

under. As for the actual heating temperature of the hub, it can be based on the interference value between the hub and the shaft and the temperature after the hub is heated.

Calculate the requirements for the shaft.

(4) Inspection after assembly

After assembling the hub of the coupling to the shaft, the perpendicularity and concentricity of the hub and shaft should be carefully checked。 usually

Two dial indicators are set on the end face and the outer circle of the hub。 Observe the entire runout of the hub (including

(Including end runout and radial runout) to determine the perpendicularity and concentricity of the hub and shaft。 different

Speed ​​couplings require different values ​​for full runout, while different types of couplings require different values ​​for full runout.

However, after the hub is assembled on the shaft, the entire runout of the wheel must be within the design requirements。

Within tolerances, this is one of the main quality requirements for coupling assembly.

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