CN102478381B

CN102478381B - Method of measuring part with inner annular slotted hole

Info

Publication number: CN102478381B
Application number: CN 201010558540
Authority: CN
Inventors: 郑晓莉; 梁清余
Original assignee: Guizhou Honglin Machinery Co Ltd
Current assignee: Guizhou Honglin Machinery Co Ltd
Priority date: 2010-11-25
Filing date: 2010-11-25
Publication date: 2013-12-18
Anticipated expiration: 2030-11-25
Also published as: CN102478381A

Abstract

The invention provides a simple method of using a combination of a steel ball, a standard part and a dial indicator to accurately measure the dimensions of an inner annular slotted hole of a part. The method is applicable to an inner annular slotted hole of a part to be detected, the diameter of a straight hole D1 of the inner annular slotted hole is smaller than phi 3mm, the diameter of the inner annular slotted hole D ranges from phi 5mm to phi 6mm, the slot depth h of the inner annular slotted hole is larger than 1/2 (D-D1), and the distance T from the upper end of an annular slot to the end face of the part is larger than 8mm. The method of measurement uses the special depth dial indicator, and the standard part composed of a cover board, a bottom board and a steel ball is made. Before measurement of the inner annular slotted hole D of the part to be detected, the depth dial indicator is used first to regulate a measurement reference through the standard part, a reading t on the dial indicator is read before specific measurement, and the value of the inner annular slotted hole D of the part to be detected is calculated.

Description

Measuring method with inner annular slotted hole part

Technical field

The present invention relates to a kind of measuring method, particularly utilize the method for each size in steel ball, standard component and the ring-like slotted eye of dial gauge combination Measurement accuracy part.

Background technology

Many valve linings are arranged in machine-building as shown in Figure 1, this part has inner annular slotted hole, and when the straight hole aperture of part, d is less than

the diameter D of inner inner annular slotted hole exists

the ÷ 2 of inner annular slotted hole groove depth h>(D-d), inner annular slotted hole upper end are to part end face during apart from T>8mm, and the size of this interior annular slotted hole is difficult to directly measurement, whether qualifiedly adds the size that can't judge interior annular slotted hole man-hour.

Summary of the invention

1. the technical matters that will solve

In order to solve the above-mentioned measurement with inner annular slotted hole part, the invention provides a kind of method of simply utilizing steel ball, standard component and each size of dial gauge combination Measurement accuracy part inner annular slotted hole, the method is applicable to part to be measured and has inner annular slotted hole, its straight hole D ₁diameter be less than Φ 3mm, the diameter D of inner inner annular slotted hole is between Φ 5mm～Φ 6mm, groove depth h is greater than 1/2 (D-D ₁), part end face is arrived apart from T>8mm in the inner annular slotted hole upper end.

2. summary of the invention

The present invention is achieved in that

1. use the degree of depth Centigrade scale of a special use, this degree of depth Centigrade scale is comprised of dial gauge, attachment screw, adapter sleeve, sounding rod, sounding rod is contained in by adapter sleeve below dial gauge, and its sounding rod lower end is the cone with tapering α, for measuring the interior annular slotted hole of part.

2. make a standard component be comprised of cover plate, base plate and steel ball, the thickness L of cover plate equates that to the tested part end face clear opening D is arranged on cover plate and base plate with tested part inner annular slotted hole upper end apart from T ₂, this clear opening D ₂diameter than the straight hole aperture D of part to be measured ₁large 0.1～0.4mm, have a hole D identical with the degree of depth with the inner annular slotted hole diameter of part to be measured in the base plate upper end ₃, (be D ₃diameter equal the diameter D of the inner annular slotted hole of part to be measured, degree of depth h1 equals the degree of depth h of the inner annular slotted hole of part to be measured), at the D of base plate ₃three steel balls fixing with butter (7) of packing in hole;

3. before the inner annular slotted hole to part to be measured is measured, at first with the sounding rod of degree of depth Centigrade scale, insert the clear opening D on standard component ₂, make the lower end of sounding rod stretch out the approximately distance of 3～5mm of cover sheet thickness L, then guarantee sounding rod and base plate D ₃steel ball in hole (7) is adjusted to 0 by the pointer of dial gauge, as measuring basis after accurately contacting;

4. then start the inner annular slotted hole of part to be measured is measured, use the D with the standard component base plate ₃the steel ball that steel ball size in hole is identical (or directly uses D ₃steel ball in hole) put into the inner annular slotted hole of part to be measured, the sounding rod of adjusting the degree of depth Centigrade scale of benchmark is inserted in the inner annular slotted hole of part to be measured, the sounding rod steel ball interior with the inner annular slotted hole of part to be measured accurately contacted, read the reading on dial gauge, reading value is t, reading on dial gauge shows while being 0+t, the diameter D that means the inner annular slotted hole of part to be measured is less than standard value, if the reading on dial gauge shows while being 0-t, means that the diameter D of the inner annular slotted hole of part to be measured is greater than standard value;

5. obtain the diameter D value of the inner annular slotted hole of part to be measured by calculating, when measuring, steel ball in the inner annular slotted hole of sounding rod and part to be measured accurately contacts, the cone of sounding rod lower end band tapering α forms geometric relationship as shown in Figure 4 in inner annular slotted hole, if t is dial gauge reading changing value, x is ring shaped slot hole dimension error change value, according to the trigonometric function relation, x=tg α t, when α is constant, when t changes, x also changes thereupon, changing value by t, can calculate the value of x, calculate the error x size of diameter D of the inner annular slotted hole of part to be measured by the reading t on dial gauge.

3. beneficial effect

The present invention utilizes 3 steel balls self-centering principle design under the effect of taper measurement bar to go out not need to dissect the method for diameter D size that workpiece just can be measured the inner annular slotted hole of part to be measured, the physical size of the diameter D of the inner annular slotted hole that can be calculated part to be measured by measured value.

The accompanying drawing explanation

Fig. 1 is the inner annular slotted hole structural representation of part to be measured;

Fig. 2 is the structural representation that degree of depth Centigrade scale and standard component fit together;

Fig. 3 is the A-A cut-open view of Fig. 2;

Fig. 4 is the inner annular slotted hole scale error of part to be measured and the geometric relationship figure of dial gauge reading changing value;

Fig. 5 is the practical structures figure of the inner annular slotted hole of part to be measured in embodiment;

The schematic diagram that Fig. 6 is sounding rod when steel ball in the inner annular slotted hole of part to be measured accurately contacts.

In figure, the 1-dial gauge, the 2-attachment screw, the 3-adapter sleeve, the 4-sounding rod, the 5-cover plate, the 6-base plate, the 7-steel ball, D-measures the inner annular slotted hole size of part to be measured, D ₁straight hole aperture on-part to be measured, D ₂clear opening on-cover plate and base plate, D ₃the hole of-base plate upper end, the degree of depth of h-part inner annular slotted hole to be measured, the hole depth of h1-base plate upper end, the thickness of L-cover plate, T-tested part inner annular slotted hole upper end is to the distance of end face, the tapering of α-sounding rod lower end cone.

Embodiment

For measuring method of the present invention is described better, now take the part shown in survey sheet 5 as example.At part inner annular slotted hole shown in survey sheet 5

during size, concrete steps are as follows:

1. at first make a standard component formed by cover plate 5, base plate 6 and steel ball 7, the inner annular slotted hole dimension D on standard component is decided to be to 5mm, the thickness L size of cover plate 5 is decided to be to 8mm, at cover plate (5) and a clear opening D of the upper brill of base plate (6) ₂, this clear opening D ₂diameter be 3.2mm, opening a diameter in base plate (6) upper end is the hole D that Φ 5.5 and the degree of depth are 2mm ₃, (be D ₃diameter equal the diameter D of the inner annular slotted hole of part to be measured, degree of depth h1 equals the degree of depth h of the inner annular slotted hole of part to be measured), the D in base plate (6) ₃three steel balls fixing with butter (7) of packing in hole; ;

2. make a degree of depth Centigrade scale formed by dial gauge 1, attachment screw 2, adapter sleeve 3, sounding rod 4, the tapering α of sounding rod 4 is decided to be to 7 °, with the sounding rod (4) of degree of depth Centigrade scale, insert the clear opening D on standard component ₂, the distance that makes the lower end of sounding rod (4) stretch out the about 3mm of thickness L of cover plate (5), then guarantee the D of sounding rod (4) and base plate (6) ₃steel ball in hole (7) is adjusted to 0 by the pointer of dial gauge (1), as measuring basis after accurately contacting;

3. the inner annular slotted hole that the degree of depth Centigrade scale sounding rod 4 that will adjust benchmark inserts part to be measured as shown in Figure 6, makes sounding rod 4 accurately contact with the steel ball in the tested part inner annular slotted hole, reads the reading on dial gauge 1.Now the reading of dial gauge 1 shows it is 0+0.814mm, means that the inner ring type groove of tested part is little.By the known X=tg7 of Fig. 4 amplification place ° 0.814=0.1, mean that the inner ring type groove physical size of tested part is 5.5-2 * X=5.5-0.2=5.3, inner annular slotted hole is described

still have process redundancy.

Claims

1. the measuring method that has the inner annular slotted hole part, the method is applicable to part to be measured and has inner annular slotted hole, its straight hole D ₁diameter be less than Ф 3mm, the diameter D of inner inner annular slotted hole is between Ф 5mm～Ф 6mm, groove depth h is greater than 1/2 (D-D ₁), the inner annular slotted hole upper end is to the part top end face apart from T>8mm, and it is characterized in that: the concrete grammar of measurement is

1. use the degree of depth Centigrade scale of a special use, this degree of depth Centigrade scale is comprised of dial gauge (1), attachment screw (2), adapter sleeve (3), sounding rod (4), sounding rod (4) is contained in by adapter sleeve (3) below dial gauge (1), and its sounding rod (4) lower end is the cone with tapering α;

2. make a standard component formed by cover plate (5), base plate (6) and steel ball (7), the thickness L of cover plate (5) equates, on cover plate (5) and base plate (6), a clear opening D is arranged with tested part inner annular slotted hole upper end to the tested part top end face apart from T ₂, in base plate (6) upper end, have a hole D identical with the degree of depth with the inner annular slotted hole diameter of part to be measured ₃, the D in base plate (6) ₃three steel balls fixing with butter (7) of packing in hole;

3. before the diameter D of the inner annular slotted hole to part to be measured is measured, at first use the sounding rod (4) of degree of depth Centigrade scale to insert the clear opening D on standard component ₂, the distance that makes the lower end of sounding rod (4) stretch out the thickness L3mm～5mm of cover plate (5), guarantee the D of sounding rod (4) and base plate (6) ₃steel ball in hole (7) is adjusted to 0 by the pointer of dial gauge (1), as measuring basis after accurately contacting;

4. then start the inner annular slotted hole of part to be measured is measured, use the D with standard component base plate (6) ₃the identical steel ball of steel ball in hole (7) diameter is put into the inner annular slotted hole of part to be measured, the sounding rod (4) of adjusting the degree of depth Centigrade scale of benchmark is inserted in the inner annular slotted hole of part to be measured, sounding rod (4) steel ball interior with the inner annular slotted hole of part to be measured accurately contacted, read the reading on dial gauge (1), reading value is t;

5. obtain the value of diameter D of the inner annular slotted hole of part to be measured by calculating, if the error of the diameter D of the inner annular slotted hole of part to be measured is x, x=tg α t, calculate the error x size of diameter D of the inner annular slotted hole of part to be measured by the reading t on dial gauge (1).

2. the measuring method with inner annular slotted hole part according to claim 1, is characterized in that: the upper clear opening D of standard component cover plate (5) and base plate (6) ₂diameter than the straight hole aperture D of part to be measured ₁large 0.1mm～0.4mm.