1. Grinding a punch with a forming grinding wheel is to trim the grinding wheel to the opposite side completely consistent with the surface of the workpiece, and then grind the workpiece with this grinding wheel to get the required shape. There are many methods for dressing grinding wheels, mainly including the following:
(1) Dressing grinding wheel with diamond
When dressing the grinding wheel with diamond, most of them dress the geometric shape of the forming surface in sections, but some of them dress the grinding wheel into one shape. This method of dressing grinding wheel mainly depends on various grinding wheel dressing tools; To finish it. Tools for grinding wheels in production mainly include angle grinding, arc grinding, universal grinding and die grinding.
Horizontal grinding wheel angle tool. Mainly used for grinding 0? ~90? Between the angles of the forming grinding wheel, then use this grinding wheel to grind the inclined plane 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 and concave shape and radius of the repaired grinding wheel.
Horizontal arc dressing grinding wheel fixture can dress various concave-convex arcs with different radii, or the contour of arc connection.
When dressing a non-circular surface, if the shape of the workpiece to be ground is complex or the outline is non-circular, the grinding wheel can be dressed with a special copying tool. Tools are special; A profiling tool for forming grinding wheels is used for trimming convex surfaces.
The die tool for dressing concave forming grinding wheel is basically the same as that for convex forming grinding wheel, except that the contact point of the template is sharp.
When using the above grinding wheel repair tool, it should be noted that the diamond tool holder used must be clamped and must not be loose.
(2) Squeeze the grinding wheel with a roller.
The outline size of the extrusion roller is the same as that of the parts, and there are straight grooves and chutes with different radial distances around the wheel. The groove width is 1.5 ~ 2.5 mm, and the depth should be more than 2.5 mm above the lowest point of the molded part ... Its groove mainly plays the role of cutting edge and can accommodate the squeezed sand. The material forms an oblique angle of 10 ~ 15 degrees with the center line of the extrusion wheel, and an iron sheet is embedded in the straight groove of 1 ~ 2. After extrusion finishing, the iron sheet is also processed and shaped, and the iron sheet can be used to check the grinding profile and shape the grinding wheel or reverse roller. The drum diameter is generally φ 50 ~ 60mm.
Extrusion grinding wheel tool is mainly composed of two thimbles. The needle is driven by a motor through pulleys or gears. When the rolling theory is gradually pressed to the grinding wheel, the grinding wheel finally obtains the required shape under pressure.
When using the squeeze grinding wheel tool, it is installed on the magnetic workbench of the surface grinder. During installation, the axis of the roller must be parallel to the axis of the grinding wheel when necessary.
In addition, in order to dress the grinding wheel, two tools, the extrusion wheel and the diamond dressing grinding wheel, can be installed on the ordinary surface grinder at the same time. At this time, the diamond knife can be copied by template without fixture. According to the model, the grinding wheel repaired with diamond tool can grind parts. But on this device, there should be a tracker. The diamond cutter interacts with the root tracker and can be installed at the same angle at the same time. Even if the position is not easy to repair, a satisfactory profile can be obtained.
Step 2 grind with a fixture
When grinding the workpiece, the workpiece can be clamped on a special fixture according to certain conditions, and the workpiece can be ground at a fixed or changing position in the morning machining process to obtain the required shape. The commonly used grinding clamps include: precision flat pliers, sinusoidal magnetic table, sinusoidal indexing fixture, universal fixture, rotating magnetic table and central hole splint. This grinding method is usually carried out on a plane grinder.
In production, in order to ensure the quality and efficiency of grinding, the comprehensive use of forming grinding wheel and fixture can greatly reduce the manufacturing cost of parts.
3. Conversion of machining dimensions of form grinding.
In form grinding, the operator needs to convert the design size of the pattern into the process size of form grinding. The reason is that the size of process equipment parts is generally marked according to the design benchmark, and the construction benchmark selected during form grinding is often inconsistent with the design benchmark. However, due to the different processing methods of various parts, there are different requirements for the size conversion of the form grinding process.