NBR70 O-Ring For Guide Rod Of Robot Arm

NBR70 O-ring for guide rod of robot arm

The rubber NBR70 O-ring of the robot arm guide rod is made of nitrile rubber (NBR) with a hardness of 70 Shore hardness.

As an O-ring, it presents a standard annular structure, which is simple but efficient. Its uniform circumferential structure allows it to form a full range of sealing contact with the rod body when installed on the guide rod of the robot arm. Whether the guide rod is making axial reciprocating motion or under the action of a certain radial force, the O-ring can rely on its own elasticity to fit tightly to the guide rod, effectively preventing external dust, water vapor and other impurities from entering the interior of the robot arm, while also preventing the internal lubricating grease and other media from leaking out, ensuring the cleanliness of the internal environment of the robot arm and the good lubrication state between the various components.

Specifications Adaptation

In terms of specifications, its inner diameter, outer diameter and thickness are all produced in accordance with the corresponding standards to adapt to the common guide rod sizes of robotic arms. It can flexibly match guide rods of different thicknesses and is more accurate in controlling the tolerance range. During installation, it will not cause poor sealing due to being too loose, nor will it cause installation difficulties or additional extrusion wear on the guide rod due to being too tight, ensuring the convenience of installation and reliability of use.

Application Scenario

In practical applications, NBR70 O-rings are widely used in various robot arm environments that have certain requirements for oil resistance. In addition to the automobile manufacturing workshop mentioned above, in some mechanical processing workshops, such as the robot arm around CNC machine tools, the use of this O-ring on the guide rod can effectively deal with the oil pollution generated during the processing and maintain the stable working state of the robot arm. At the same time, in some ordinary industrial production environments, as long as there is a certain amount of oil medium, NBR70 O-rings can be a high-quality choice to ensure the sealing performance of the guide rod of the robot arm.

What is the specific composition of nitrile rubber (NBR), and what impact does the proportion of different components have on key properties such as oil resistance and chemical corrosion resistance?

• Nitrile rubber (NBR) is mainly made of butadiene and acrylonitrile through polymerization. Generally speaking, the content of acrylonitrile plays an important role in its key properties. The higher the acrylonitrile content, the better the oil resistance and chemical corrosion resistance, because the acrylonitrile group gives the rubber resistance to oils and chemicals. Butadiene affects the elasticity, flexibility and processing performance of the rubber more. For example, when the proportion of acrylonitrile is around 30% - 40%, nitrile rubber can show good oil resistance while having good elasticity, and can cope with common lubricating oil, hydraulic oil and other environments; if the acrylonitrile content is increased to 40% - 50%, its chemical corrosion resistance will be further enhanced, and it can have better tolerance for some complex working conditions containing acids, alkalis and other chemicals, but accordingly, the elasticity of the rubber may decrease slightly and the hardness will increase slightly.

How to ensure that the nitrile rubber (NBR) material used is from a reliable source and of stable quality, and whether there are corresponding quality inspections?

• In order to ensure that the source of nitrile rubber materials is reliable and the quality is stable, we have taken many measures. First of all, in the procurement of raw materials, we only cooperate with suppliers with good reputation, complete qualifications and relevant quality system certification (such as ISO quality management system certification, etc.), and require suppliers to provide detailed raw material composition reports, performance test reports and other information. Secondly, when the raw materials enter the factory, they will be strictly inspected. The test items cover basic performance indicators such as hardness, tensile strength, oil resistance, and chemical corrosion resistance. They will be inspected in accordance with national standards and standards higher than the industry average formulated by the company. Only raw materials with qualified indicators can enter the production link. In addition, during the entire production process, the quality of the products in progress will be regularly monitored to ensure that the quality of nitrile rubber is controllable and stable at every link from the source to the finished product.

During long-term use, will the 70 Shore hardness change? If so, what is the approximate range of change and what impact will it have on the sealing effect?

• During long-term use, the 70 Shore hardness may change to a certain extent. Normally, if the ambient temperature is relatively stable, the movement frequency of the robot arm is moderate, and it is not subjected to excessive external force, extrusion, friction, etc., the hardness change range is generally within ±5 Shore hardness. However, if it is under relatively harsh working conditions such as high temperature and high load, the hardness change may be slightly larger, reaching about ±8 Shore hardness. When the hardness increases, the sealing ring may become more brittle and the elasticity decreases. When the guide rod reciprocates, the fit becomes worse, and tiny gaps are prone to appear, resulting in a decrease in the sealing effect and possible leakage. When the hardness decreases, the sealing ring is easily over-extruded and deformed, and it is difficult to restore to its original state, which will also affect the tightness of the seal and cannot effectively prevent the entry of external impurities and the leakage of internal media.

How can we ensure the consistency of hardness among different batches of products? Are strict hardness control measures implemented in the production process?

• We have strict hardness control measures in the production process to ensure the consistency of hardness of different batches of products. First, in the batching process, raw materials such as butadiene, acrylonitrile and other additives are added in strict accordance with the precise formula ratio, and high-precision metering equipment is used to ensure the accuracy of each batch. Secondly, in the key production process stage of vulcanization, the parameters such as vulcanization temperature, pressure and time are precisely controlled, because these parameters have a direct impact on the final hardness of the rubber. Through automated vulcanization equipment and real-time monitoring systems, it is ensured that each batch of products is vulcanized under the same and precise process conditions. In addition, before the finished product leaves the factory, a hardness spot check will be carried out on the entire batch. A sufficient number of samples will be drawn according to the statistical sampling method, and professional hardness testing instruments will be used for testing. Only products with a hardness that meets the specified 70 Shore hardness range and with extremely small deviations within the batch can be packaged and shipped, so as to ensure the high consistency of hardness of different batches of products.

During the actual operation of the robotic arm, the product may encounter extreme conditions that exceed the normal tensile force. How will the product perform at this time? Is there a corresponding safety redundancy design?

• When encountering extreme situations that exceed the normal tensile force, the performance of the product depends on factors such as the degree of excess and the way the force is applied. If the tensile force does not exceed a certain extent, the elasticity and toughness of the nitrile rubber itself will play a role, and tensile deformation will be performed to a certain extent to buffer the external force and try to maintain the integrity of the structure. It may only be a temporary and recoverable deformation, and the sealing effect will not be greatly affected in a short time. However, if the tensile force exceeds the degree by a large extent, it may cause irreversible tensile deformation of the sealing ring, or even breakage and damage, thus causing the seal to fail. In order to cope with this situation, we have a certain safety redundancy in product design. On the one hand, by optimizing the formula of rubber, appropriately increasing its cross-linking density, and improving the tensile strength and tear resistance of rubber; on the other hand, in the structural design of the sealing ring, such as adopting a reasonable cross-sectional shape and size, the stress distribution is more uniform when it is subjected to force, which can better disperse the tensile force that exceeds the normal, and minimize the risk of product failure in extreme situations, so as to ensure that the mechanical arm can still maintain the sealing function for a certain period of time when it is accidentally subjected to force.

you claim (even if there are differences between different manufacturers, they are the values under your own standards) based on? Are they highly consistent with the actual application scenarios?

• The tensile strength value we claim is based on strict national standard test methods. The specific test environment and conditions are as follows: In a standard laboratory environment with a temperature of (23 ± 2) ℃ and a relative humidity of (50 ± 5)%, a professional tensile testing machine is used to perform tensile tests on standard specimens (the size and shape of the specimens are made in accordance with relevant standards) at a specified tensile speed (generally around 500mm/min) until the specimen breaks, and the maximum tensile force at the time of break is recorded, and the tensile strength value is calculated based on the initial size of the specimen. Although the test environment is a standard laboratory environment, when actually designing the test plan, we fully considered the various stress conditions that may be encountered in actual application scenarios, and in the subsequent product verification stage, multiple tests will be conducted on a test bench that simulates actual working conditions to ensure that the measured tensile strength value can reasonably reflect the product's ability to cope with tensile forces in actual application scenarios such as the operation of a robotic arm, which is highly consistent with the actual application scenario and can provide users with a reliable reference basis.

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