JPS58181568A - Correction of grindstone diameter of grinding machine - Google Patents

Abstract

PURPOSE:To control the grindstone wheel shaft position for following grinding easily and accurately by measuring and comparing the distance between the grindstone wheel and the work table and the diameter of the grindstone before and after usege. CONSTITUTION:A grindstone wheel 11 is fixed to the grindstone axel 13 to preliminarity grind a test chip 3 and to record the indication on a scale 19. Then the grindstone 11 is lifted to proper position to contact a contactor 27 against the outercircumferential face of the grindstone 11 thus to origin register in two digital scales 19, 31. Thereafter the remaining thickness of said chip 3 is measured and employed as the level of (n) such that 1+n=Co. If the abrasion of the grindstone 11 is required to confirm in the way of grinding, the grindstone 11 is lifted to contact the contactor 27 against the grindstone 11, then necessary value of Cn can obtained immediately from the relation Cn=Co+An-Bn (where An:indication of device 19, Bn:indication of device 31.)

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for correcting the diameter of a grinding wheel for a grinding machine. By stopping at the position,
This relates to a method of accurately detecting the distance between the lower edge of the outer periphery of the grinding wheel and the top surface of the table that fixes the workpiece of the grinding machine at each detection time, and controlling the position of the grinding wheel's φ axis for subsequent grinding operations. .

Taking the present invention as an example of a surface grinder, the measures against conventional grinding wheel wear are as follows.

The grinding ratio of a specific material to be ground is determined experimentally for each type of grinding wheel and is listed in a table.The amount of wear of the grinding wheel is calculated from the amount of material to be ground, and the outer diameter of the grinding wheel is calculated. One method is to control the cutting depth of the grinding wheel for each bus in terms of reduced sound.

Although there should be no problems with this method in theory, there is a problem in that accurate grinding cannot be achieved if the materials to be ground do not all have the same hardness, or if the shape and dimensions are not constant.

Another method used is to detect the amount of wear by placing a contact on the outer periphery of the grinding wheel for each pass, and sending the data to a computer to control the amount of push in the next grinding process. In this case, the contacts would wear out, resulting in inaccurate measurements, or the grinding wheel would wear out due to unnecessary dressing.

The present invention has been made to overcome the drawbacks of the conventional methods described above, and preferred embodiments will be described in detail below with reference to the drawings.

FIGS. 1 and 2 show an example in which the present method is applied to a surface grinder 1. A workpiece 3 to be ground is placed on an X-direction reciprocating table 5 of the surface grinder 1, and is guided by a column 7 from above. There are two grinding wheel heads that approach and move away from the table 5 in the Z direction (vertical direction), and a grinding wheel 11 is supported by the grinding wheel head 9 and rotationally driven by an electric motor (not shown).

An arm member 15 is attached to the grinding wheel head 9 horizontally from the grinding wheel center shaft 13.
The column 7 of the surface grinding machine 1 is provided with a digital scale device 19 fixed vertically. The pointer 21 and the digital scale device 1
Although the number @23 is written in 9, it is only written for explanation and is not actually used.

Similarly, the grinding wheel head 9 is provided with a vertical guide tube 25, in which a contact 27 that is driven and moved up and down is located above the outer periphery of the grinding wheel 11.

A magnetic block (not shown) is provided on the interlocking shaft 29 of the contactor 27, and a digital scale device @31 perpendicular to the corresponding guide tube 25 is also provided, but for convenience of explanation, the pointer 33 is also provided in this case. and scale 35 are also written.

The present invention will be explained in detail with the above device.

Attach a new grinding wheel 11 to the grinding wheel axle 13, fix a suitable material 3 such as a test piece to the reciprocating table 5, perform test grinding, stop the rotation of the grinding wheel at the lowered position, and display on the digital scale device 19. Record it. The model grinding wheel 11 is raised and stopped at an appropriate position.The appropriate position here may be any location, but when performing actual grinding work, the height of the material to be ground 3 will change, and the grinding wheel 11 can be used. Since the maximum dimension of the grinding wheel is also limited by the grinding machine, it is desirable to return the grinding wheel head 9 to the uppermost position (dressing operation position in many cases) and stop.

Next, the contactor 27 is lowered until it contacts the upper outer periphery of the grinding wheel 11, and the origin is registered in one of the two digital scale devices 31. That is, from then on, the scale position indicated by the pointer 21.33 shown in Fig. 1 becomes zero, and downward from this point is negative 1/
Digital display will be made in units of 100,111 m. In addition, the remaining thickness of the test abrasive material was reduced to 1/1 by appropriate means.
Measure 31 at the 100111 position and use it as the value of m in Figure 1, and p
+m=co. At this time, when the machine is stopped, the display on the digital scale 19 is recorded, and the difference from the lowest position of the test cutting is corrected to obtain the value of Ω shown in FIG.

If you carry out the actual grinding work with the above settings, you can check the amount of wear on the grinding wheel 11 during grinding and whenever you need to cover it, you can grind it at any height. If the grinding wheel 11 is stopped, the rotation of the grinding wheel 11 is also stopped, and the contactor 27 is applied to the outer periphery of the upper end of the grinding wheel 11, Cn = Co + An -B.
n (medium 1/100 gu+) holds true. However, Cn: Distance An from the top surface of the reciprocating table to the outer periphery of the lower end of the grinding wheel when the D-th stop measurement is performed; Display on the digital scale device 19 (metalwork negative sign) Bn: Display on the digital scale device 31 (metalwork negative sign) ) That is, according to the grinding wheel diameter correction method of the present invention, when a 5-layer grinding wheel is newly installed on the axle, the Co value including the measured value is calculated using a test piece and stored in a computer, and the result is stored in a computer. Once you have set the origin, you can raise the newly installed grinding wheel to any temperature and any height at any time until it is no longer in use, stop it, and apply a contact to it, and the computer will automatically correct it each time. In other words, the distance from the bottom surface of the grinding wheel to the top surface of the carriage, which incorporates the outer dimension of the grinding wheel, is entered in units of 1/100 nua, so the conventional nominal i grinding ratio is used as the standard. Compared to automatic grinding methods, it is possible to grind with much higher precision, and there is no measurement error due to contact wear or damage caused by excessive dressing (the shortcomings of conventional methods have been overcome).

In the present invention, a surface grinder is used as an example, but it is obvious that the technical idea can be easily applied to other grinders by making slight design changes.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram of test grinding when the present invention was applied to a surface grinder, and FIG. 2 is an explanatory diagram of actual grinding. Explanation of symbols representing main parts in the drawings 1... Surface grinding M 3... Material to be ground 5...
Reciprocating table 19... Digital scale device -27... Contactor 31... Digital scale device patent applicant AMADA Co., Ltd. No. 11!
1 Figure 12

Claims (1)

[Claims] Detects the dimension from the grinding wheel to the top of the table at the reference position, detects the diameter of the grinding wheel at this time, then detects the amount of movement of the grinding wheel from the reference position, and detects the amount of wear on the grinding wheel. A grinding wheel diameter correction method characterized in that the dimension from the grinding wheel to the top surface of the table is calculated and compensated.