When the fixture bottom plate is used on a horizontal machining center, it can be easier to set up and install the fixture by setting threaded holes, reaming holes, slots, etc. It is generally made according to the shape of the machining center workbench. Its functions include adjusting the height of the workpiece, It can protect the machine tool table, adjust the orientation of the workpiece as needed, and perform multi-faceted processing at the same time. How to choose the fixture bottom plate of the horizontal machining center worktable?
First, confirm the maximum load capacity of the machine tool, and secondly, confirm the total weight of the workpiece, fixture, base plate, and base. The total weight must not exceed the maximum load capacity of the machine tool. There are also designers who calculate the weight of the workpiece, base plate, and base, but forget to calculate the weight of the fixture, which cannot be ignored.
If the total weight exceeds the maximum load of the machine tool, you can choose to reduce the thickness of the base plate, reduce the thickness of the base mounting surface, or make the base hollow to reduce the overall weight.
The basic sizes of horizontal machining centers are 400X400, 500X500, 630X630, and 800X800. Depending on the machine tool manufacturer, there are also sizes such as 300X300, 1000X1000, and special sizes such as 550X550 are also produced by machine tool manufacturers.
The positioning of the bottom plate and base of a horizontal machining center generally uses workbench blocks installed in the X and Y directions. The base plate and base are positioned by fitting the workbench block. The position of the workbench backing block is generally set at the 0° and 270° orientations of the machine tool workbench. The position of the workbench backing block also varies depending on the machine tool manufacturer.
However, not all T-slots can be accurately positioned. Depending on the machine tool manufacturer, there are generally only 1 or 2 T-slots in the machine tool with positioning function.
Secondly, when selecting the base plate and base, the maximum height and maximum rotation diameter of the machine must be confirmed in advance. The maximum rotation diameter of a horizontal machining center is something that must be confirmed. Generally, when the base size is 400X400, the maximum rotation diameter is Φ630. When the base size is 500X500, the maximum rotation diameter is Φ800. The above two sizes are the more common sizes, and there is no clear requirement to use a base of this size. When the clamp clamps the workpiece from top to bottom, the top of the clamp must be within the maximum rotation diameter.
Finally, it is necessary to confirm in advance whether the machining range of the horizontal machining center (the movement range of the spindle) covers all the parts of the workpiece that need to be processed. Especially when using a milling cutter to process the surface, when retracting the tool, whether the stroke of the spindle can completely remove the tool from the workpiece must be considered in advance during design. If retraction is not considered, it will be more difficult to ensure surface accuracy. of. When the milling cutter exits the workpiece, the minimum distance between the milling cutter and the workpiece needs to be more than 10 mm, that is, the cutter needs to completely leave the workpiece range.
