Three basic functions of linear rod rail
linear rod rail as the core component to realize linear motion in the mechanical system, its function revolves around the three core components of "precise guidance, stable bearing and efficient transmission", which work together to ensure that the equipment from simple translation to precise positioning needs. The three components work together to ensure that the equipment from simple translation to precision positioning of the full range of scene requirements.
First, the guidance function: the precision of the constraint movement trajectory
The guidance function is the basic core of the linear guide, through the rigidity of the slider and the guide rail with the rigidity of the slider and the guide rail, forced to limit the trajectory of the moving parts as a straight line, eliminating the redundant degrees of freedom (e.g., rotating, oscillating). The key lies in "trajectory consistency":
Degree of freedom constraints: guideway cross-section (such as square, round, dovetail) and slider fit clearance ≤ 0.01mm, retaining only the translational degree of freedom along the axis of the guideway, restricting the movement in the other 5 directions (radial, axial rotation, etc.), to ensure that the machine tool Worktable, robotic arm and other components move along the preset path, deviation ≤ 0.005mm/m.
Linearity Guarantee: The guide rail is precision ground (straightness ≤ 0.002mm/m), and the slider is contacted with the slide rail through the rolling body (ball/roller), so that the linearity error of the motion track is controlled in a very low range. For example, the guide rail guiding error of the semiconductor lithography machine needs to be ≤0.001mm/1000mm in order to ensure that the photolithography pattern of the nesting accuracy.
Dynamic trajectory stability: in high-speed movement (≥ 3m / s), the guiding function by suppressing vibration (amplitude ≤ 0.001mm) to maintain a stable trajectory, to avoid offset due to inertial forces, such as automated sorting machine guide needs to ensure that the gripping mechanism in high-speed movement of the trajectory deviation of ≤ 0.02mm, in order to accurately docking materials.
2. Load carrying function: structural support for load dispersion
Load carrying function guides the ability of guide rail to withstand loads perpendicular to the direction of movement (radial, axial, tilting moments) and to disperse the stresses, which directly determines the upper limit of the load of the equipment and the safety of operation:
Adaptation of the load type:
The radial load (e.g., table weight) is carried by the guide rail slideway. Radial loads (e.g. table weight) are carried by the side or bottom surfaces of the guideway slide, and the stresses are dispersed by increasing the contact area (e.g. line contact in roller guideways);
Axial loads (e.g. forces transmitted by thrust bearings) are carried by the end caps or stops of the slide, which, in conjunction with the preloaded design, counteracts the impacts;
Tilting moments (e.g. forces transmitted by cantilevered constructions) Dumping moment (such as the cantilever structure of the bias load) through the symmetrical arrangement of the double guideway, so that both sides of the slider force balance (difference ≤ 10%), to avoid unilateral overload deformation.
Material and structural support: The guideway is made of high-strength alloy steel (e.g. 42CrMo), quenched (hardness ≥ HRC58), and can withstand a load of 10-50kN per meter of length (depending on specifications). For example, a single guide rail for heavy-duty CNC machine tools can carry up to 30kN, and with multiple parallel installations, the total load capacity can be expanded to hundreds of kilonewtons.
Stress dispersion design: the contact points of the slider and guideway are distributed in multiple columns (such as four columns of ball), so that the load is uniformly transferred to the guideway substrate, the pressure per unit area is ≤ 500MPa, avoiding plastic deformation caused by localized stress concentration, and prolonging the service life.
Three basic functions of linear rod rail
linear rod rail as the core component to realize linear motion in the mechanical system, its function revolves around the three core components of "precise guidance, stable bearing and efficient transmission", which work together to ensure that the equipment from simple translation to precise positioning needs. The three components work together to ensure that the equipment from simple translation to precision positioning of the full range of scene requirements.
First, the guidance function: the precision of the constraint movement trajectory
The guidance function is the basic core of the linear guide, through the rigidity of the slider and the guide rail with the rigidity of the slider and the guide rail, forced to limit the trajectory of the moving parts as a straight line, eliminating the redundant degrees of freedom (e.g., rotating, oscillating). The key lies in "trajectory consistency":
Degree of freedom constraints: guideway cross-section (such as square, round, dovetail) and slider fit clearance ≤ 0.01mm, retaining only the translational degree of freedom along the axis of the guideway, restricting the movement in the other 5 directions (radial, axial rotation, etc.), to ensure that the machine tool Worktable, robotic arm and other components move along the preset path, deviation ≤ 0.005mm/m.
Linearity Guarantee: The guide rail is precision ground (straightness ≤ 0.002mm/m), and the slider is contacted with the slide rail through the rolling body (ball/roller), so that the linearity error of the motion track is controlled in a very low range. For example, the guide rail guiding error of the semiconductor lithography machine needs to be ≤0.001mm/1000mm in order to ensure that the photolithography pattern of the nesting accuracy.
Dynamic trajectory stability: in high-speed movement (≥ 3m / s), the guiding function by suppressing vibration (amplitude ≤ 0.001mm) to maintain a stable trajectory, to avoid offset due to inertial forces, such as automated sorting machine guide needs to ensure that the gripping mechanism in high-speed movement of the trajectory deviation of ≤ 0.02mm, in order to accurately docking materials.
2. Load carrying function: structural support for load dispersion
Load carrying function guides the ability of guide rail to withstand loads perpendicular to the direction of movement (radial, axial, tilting moments) and to disperse the stresses, which directly determines the upper limit of the load of the equipment and the safety of operation:
Adaptation of the load type:
The radial load (e.g., table weight) is carried by the guide rail slideway. Radial loads (e.g. table weight) are carried by the side or bottom surfaces of the guideway slide, and the stresses are dispersed by increasing the contact area (e.g. line contact in roller guideways);
Axial loads (e.g. forces transmitted by thrust bearings) are carried by the end caps or stops of the slide, which, in conjunction with the preloaded design, counteracts the impacts;
Tilting moments (e.g. forces transmitted by cantilevered constructions) Dumping moment (such as the cantilever structure of the bias load) through the symmetrical arrangement of the double guideway, so that both sides of the slider force balance (difference ≤ 10%), to avoid unilateral overload deformation.
Material and structural support: The guideway is made of high-strength alloy steel (e.g. 42CrMo), quenched (hardness ≥ HRC58), and can withstand a load of 10-50kN per meter of length (depending on specifications). For example, a single guide rail for heavy-duty CNC machine tools can carry up to 30kN, and with multiple parallel installations, the total load capacity can be expanded to hundreds of kilonewtons.
Stress dispersion design: the contact points of the slider and guideway are distributed in multiple columns (such as four columns of ball), so that the load is uniformly transferred to the guideway substrate, the pressure per unit area is ≤ 500MPa, avoiding plastic deformation caused by localized stress concentration, and prolonging the service life.
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