Diamond tool grinder is used to manufacture and grind PCD, PCBN, CVD and other superhard material tools. These superhard materials have high hardness (such as PCD hardness is HV6000). And strong brittleness. There are special technological requirements for grinding them. Therefore, this kind of tool grinder has special structural characteristics. In addition, manual machine tools are the mainstream equipment for superhard tool grinding at present. Because the complex grinding process requires that the machine tools have enough flexibility for the operator to intervene manually.
The grinding wheel oscillates back and forth
The abrasive tools used in the superhard tool grinder are diamond grinding wheels. Which rub against each other and cause wear and tear. In order to prolong the service life of the grinding wheel and minimize the times of dressing. The grinding wheel is required to oscillate back and forth within the specified range (as shown in Figure 1) so as to make the grinding wheel wear uniformly in the direction of ring width.
There are two ways to realize the swing of grinding wheel: crankshaft connecting rod mechanism and ball screw driven by the NC program. The former is to turn the rotation of the motor into the reciprocating oscillation of the grinding wheel through the mechanical structure. The program controls the latter.
On-line tool setting device.
The removal of materials on superhard tools by grinding not only consumes time. But also consumes precious diamond grinding wheels, which is a high-cost task. In order to reduce the grinding allowance as much as possible, this kind of machine tools is equipped with an on-line tool alignment device. Before starting grinding, tool alignment is carried out. That is to say, the standard markings on the microscope are used as the benchmark. And the crosstable is adjusted to make the edge of the tool comparable to it so as to minimize the grinding allowance (as shown in Figure
Of course, most of the super-hard cutting tools are turning tools or blades, unlike axisymmetric cutting tools with accurate positioning datum (cylindrical surface). Online tool setting device is an effective tool to determine its processing position. This is also one of the reasons why Superhard Tool Grinders adopt online tool setting device.
Heavy-duty guideway
Super hard tool grinder is known as "strong grinding". It means that the whole grinding device bears a lot of force during grinding. This requires that the machine tool has a great bearing capacity. Super hard tool grinder adopts N-O type linear guide with strong ability to bear the heavy load. N-O type linear guide can bear the higher rated load, can bear a certain amount of torque. But also has great stiffness. The contact surface of the two guideways is a needle-roller retaining bracket.
When the machine tool guideway moves, the needle supports and rolls between the two guideways. Which greatly reduces the friction coefficient and even reduces it to one-fifth of the normal sliding guideway. It can quickly respond to the requirements of the machine tool dragging system and make the swing shaft realize high precision and smooth linear motion under high load. At the meanwhile, the needle-roller retaining bracket distributes the wear amount of the guide rail to each needle roller. Thus prolonging the service life of the linear guide rail.
