Use a surface grinder to grind the parts and teach you how to do it

Release time:

2021-05-18

In production, there are two main methods for forming parts with a surface grinder. One is to grind with a shaped grinding wheel after dressing, and the other is to grind by a special jig.

Form grinding with surface grinder

In production, there are two main methods for forming parts with a surface grinder. One is to grind with a shaped grinding wheel after dressing, and the other is to grind by a special jig.

1. Grinding the punch with a shaped grinding wheel is to dress the grinding wheel into an inverted surface that is completely consistent with the surface of the workpiece, and then use the grinding wheel to grind the workpiece to obtain the desired shape. There are many ways to dress the grinding wheel, the main ones are as follows:

(1) Dressing wheel with diamond

When using diamond to dress the grinding wheel, most of them are to dress the geometry of the forming surface in sections, but some dress the grinding wheel into a reshape. This method of dressing the grinding wheel is accomplished by various tools for dressing the grinding wheel. The grinding wheel repair tools in production mainly include angle repairing, arc grinding wheel repairing tools, universal grinding wheel repairing tools, and profiling grinding wheel repairing tools.

Horizontal grinding wheel angle tool. It is mainly used to grind the forming grinding wheel of various angles between 0o and 90o, and then use this grinding wheel to grind the inclined surface of the workpiece.

When dressing the grinding wheel, the position of the diamond tip is adjusted by calculating the pad value according to the convex or concave shape and radius of the grinding wheel to be repaired.

Horizontal arc trimming grinding wheel fixture can trim various concave and convex arcs with different radii, or the profile connected by the arc and the arc.

When the non-circular arc surface is trimmed, if the shape of the workpiece to be ground is more complicated or the contour is non-circular, a special profiling tool can be used to trim the grinding wheel. The tool is a special purpose; it is a master tool that loves to dress the convex surface of the forming wheel.

The type tool for dressing concave surface forming grinding wheel is basically the same as the mastering tool for convex surface forming grinding wheel, but the contacts of the model template should be pointed.

Several kinds of grinding wheel repair tools introduced above should be paid attention to when using, the diamond tool bar used must be clamped, and must not be loosened.

(2)Using the roller to squeeze the grinding wheel

The profile size of the extruded roller is the same as that of the part. The wheel circumference is provided with straight grooves with unequal distances in the radial direction. The width of the groove is 1.5～2.5mm, and the depth should exceed the lowest point of the formed part by more than 2.5 mm. The groove mainly functions as a cutting edge and can accommodate the squeezed sand particles. The material and the center line of the extrusion wheel are at an oblique angle of 10o to 15o, and the iron sheet is embedded in 1 to 2 straight grooves. After the extrusion and finishing, the iron sheet is also processed into shape. This iron sheet can be used to check the grinding profile and Forming grinding wheel or reverse roller. The diameter of the roller is generally Φ50～60mm.

Extrusion wheel tool, mainly composed of two thimble. The living needles are driven by electric motors through pulleys or gears. When the rolling theory gradually presses against the grinding wheel, under the action of pressure, the grinding wheel finally obtains the required shape.

The squeeze wheel tool is installed on the magnetic worktable of the surface grinder when in use. When installing, the axis of the roller must be parallel to the axis of the grinding wheel.

In addition, in order to refurbish the grinding wheel, two tools can be installed on the ordinary surface grinder at the same time as the extrusion wheel and the diamond dressing wheel. At this time, the diamond knife can be profiled with a template instead of a jig. The parts can be ground with the grinding wheel trimmed with a diamond knife according to the template. But on this kind of device, there should be a tracker. The diamond knife interacts with the root tracer, and can be installed and rotated through the same angle at the same time, even if the position is not easy to repair the curve, it can also form a satisfactory profile.

2. Grinding with jigs

When grinding the workpiece, the workpiece can be clamped on a special fixture according to certain conditions. In the morning of the processing, the position is fixed or constantly changed for grinding to obtain the desired shape. Commonly used grinding clamps include: precision flat-nose pliers, sinusoidal magnetic table, sinusoidal indexing fixture, universal fixture, rotating magnetic table and center hole splint, etc. This grinding method is generally performed on a surface grinder.

In order to ensure the quality and efficiency of grinding, the method of forming grinding wheels and fixtures is generally used in production, which can greatly reduce the cost of parts manufacturing.

3. Conversion of forming and grinding process dimensions

When forming and grinding, the operator needs to convert the design size of the pattern into the process size of forming and grinding. The reason is that the dimensions of process equipment parts are generally marked on the basis of design, and the construction basis selected for forming and grinding is often inconsistent with the design basis. However, due to the different processing methods of individual parts, there are also different requirements for the conversion of the forming and grinding process dimensions.