CN105865307A - Workpiece inner diameter measurement tool and method - Google Patents

Abstract

The invention discloses a tool and method for measuring the inner diameter of a workpiece, which comprises a fixed scale frame, a sliding scale frame and a ring gauge conforming to the dimensional tolerance of the workpiece to be measured, and a fixed measuring head is arranged on the fixed scale frame, A dial indicator is arranged on the sliding scale frame, and the dial indicator moves back and forth along the direction where the fixed measuring head is located under the drive of the sliding scale frame. The measurement method adopts the comparative measurement method. Firstly, a ring gauge conforming to the tolerance of the inner diameter of the part is manufactured in advance, and the real value of the size of the ring gauge is measured with a precision instrument. Before the measurement, the zero position of the dial indicator on the tool is corrected. The indicated value on the dial indicator is the deviation value of the workpiece relative to the ring gauge, from which the true value of the workpiece size can be calculated. By comparison, it can be judged whether the processed parts are qualified.

Description

A tool and method for measuring the inner diameter of a workpiece

technical field

The invention relates to the technical field of measurement, in particular to a tool and method for measuring an inner diameter.

Background technique

In mechanical engineering, it is often necessary to measure the inner diameter of processed sleeve parts. The inner diameter measuring tools currently used have a complicated structure and are inconvenient to use. For this purpose, a tool for measuring the inner diameter was designed.

Contents of the invention

The object of the present invention is to provide a measuring tool, which is suitable for measuring the inner diameter of sleeve parts and can meet the needs of the field of precision mechanical measurement.

The present invention adopts following technical scheme:

A tool for measuring the inner diameter of a workpiece, including a fixed ruler frame, a sliding ruler frame and a ring gauge conforming to the dimensional tolerance of the workpiece to be measured, a fixed measuring head is arranged on the fixed ruler frame, and a fixed measuring head is arranged on the sliding ruler frame A dial indicator is set, and the said dial indicator moves back and forth along the direction where the fixed probe is located under the drive of the sliding frame.

Further, each of the fixed ruler frame and the sliding ruler frame includes a horizontal bar and a vertical bar connected to one end of the horizontal bar; the other ends of the two horizontal bars are movably connected in the horizontal direction, and the two vertical bars are arranged opposite to each other.

Further, the fixed measuring head is fixed on the inner side of the vertical rod of the fixed ruler frame by fastening screws.

Further, the dial indicator is fixed on the inner side of the vertical bar of the sliding frame by fastening screws.

Further, the centerlines of the fixed measuring head and the dial indicator are on the same straight line.

Further, a groove is provided on the horizontal rod of the fixed ruler frame, and the horizontal rod of the sliding ruler frame is embedded in the groove, and the two are fixed by adjusting screws.

Utilize described tool to measure the method for workpiece internal warp, as follows:

Step 1. Pre-manufacture a ring gauge with the same inner diameter as the part to be tested, and use precision instruments to measure the true value of the ring gauge size;

Step 2. Fix the fixed measuring head on the fixed ruler frame, and fix the dial indicator on the sliding ruler frame;

Step 4 Adjust the connectors of the fixed ruler frame and the sliding ruler frame so that the fixed probe and the dial indicator probe are in contact with the inner surface of the ring gauge in step 1; tighten the connectors to fix the positions of the sliding ruler frame and the fixed ruler frame, Then reset the pointer of the dial indicator to zero;

Step 5 Use the tool to measure the inner diameter of the part to be tested. At this time, the indicated value on the dial indicator is the deviation value of the part to be tested relative to the ring gauge, and thus the true value of the workpiece size can be calculated.

The beneficial effects of the present invention are as follows:

The measurement method adopts the comparative measurement method. Firstly, a ring gauge conforming to the tolerance of the inner diameter of the part is manufactured in advance, and the real value of the size of the ring gauge is measured with a precision instrument. Before the measurement, the zero position of the dial indicator on the tool is corrected. The indicated value on the dial indicator is the deviation value of the workpiece relative to the ring gauge, from which the true value of the workpiece size can be calculated. By comparison, it can be judged whether the processed parts are qualified.

The measurement error of this tool is mainly caused by the dial indicator and the calibration ring gauge. Since the error of the calibration ring gauge has been corrected, the measurement accuracy of this tool is the same as that of the dial indicator.

Description of drawings

In order to illustrate the technical solutions of the embodiments of the present invention more clearly and effectively, the accompanying drawings used in the embodiments will be briefly introduced. It is self-evident that the accompanying drawings in the following description are only some embodiments of the present invention. Those of ordinary skill in the art can make other drawings based on these drawings without creative labor.

Fig. 1 is the structural representation of the sleeve type parts measured by the present invention.

Fig. 2 is a schematic structural view of a tool for measuring an inner diameter of the present invention.

In the figure: 1 fixed measuring head, 2 fastening screw, 3 fixed ruler frame, 4 groove, 5 adjusting screw, 6 sliding ruler frame, 7 fastening screw, 8 dial indicator probe, 9 dial indicator.

detailed description

The present invention is described in detail below in conjunction with accompanying drawing:

Figure 1 is a sleeve-type part, in which the depth of the large-diameter hole of the part is small, and it is inconvenient to use a general-purpose inner diameter measuring tool to measure. For this reason, disclose a kind of tool of measuring inner diameter, concrete structure is as follows:

As shown in Figure 2, the tool for measuring the inner diameter of the workpiece includes a fixed ruler frame 3, a sliding ruler frame 6 and a ring gauge that meets the dimensional tolerance of the workpiece to be measured, and a fixed measuring head is arranged on the fixed ruler frame 3 1. A dial indicator 9 is set on the sliding ruler frame 6, and the dial indicator 9 moves back and forth along the direction where the fixed measuring head is driven by the sliding ruler frame 3; the sliding ruler frame 3 is relative to the fixed ruler frame 3 can move back and forth.

Further, the fixed ruler frame 3 and the sliding ruler frame 6 each include a horizontal bar and a vertical bar connected to one end of the horizontal bar; the other ends of the two horizontal bars are movably connected in the horizontal direction, and the two vertical bars are relatively arranged; The horizontal rod of the ruler frame 3 is provided with a groove 4, and the horizontal rod of the sliding ruler frame 6 is embedded in the groove, and the two are fixed by the adjusting screw 5; when the dial gauge 9 needs to be moved, loosen the adjusting screw 5, Move the slide ruler frame 6 to get final product.

Further, the fixed measuring head 1 is fixed on the inner side of the vertical rod of the fixed ruler frame 3 through fastening screws 2 , opposite to the dial gauge measuring head 8 .

Further, the dial indicator 9 is fixed on the inner side of the vertical bar of the sliding scale frame 6 through the fastening screw 7, opposite to the fixed probe 1 . At the same time, in order to ensure the accuracy of the measurement, the centerlines of the fixed probe 1 and the dial indicator 9 are on the same straight line.

Further, the above-mentioned ring gauge is a standard part in the field of workpiece measurement, and the specific structure will not be repeated here.

The measurement method of the present invention adopts a comparative measurement method, firstly manufacture a ring gauge with the same inner diameter size as the part, and measure the real value of the ring gauge size with precision instruments. First, fix the fixed measuring head 1 on the ruler frame with groove 3 with the fastening screw 2, fix the dial indicator 9 on the sliding ruler frame 6 with the fastening screw 7, and loosen the adjusting screw 5 to make the fixed measuring head of the tool Head 1 and dial indicator probe 8 are in contact with the inner side of the ring gauge, tighten the adjusting screw 5, fix the length of the grooved ruler frame 3 and the sliding ruler frame 6, and then reset the pointer of the dial indicator 9 to zero. When the tool is used to measure the inner diameter of the part, the indicated value on the dial indicator is the deviation value of the workpiece relative to the ring gauge, from which the true value of the workpiece size can be calculated. By comparison, it can be judged whether the processed parts are qualified.

Although the specific implementation of the present invention has been described above in conjunction with the accompanying drawings, it does not limit the protection scope of the present invention. Those skilled in the art should understand that on the basis of the technical solution of the present invention, those skilled in the art do not need to pay creative work Various modifications or variations that can be made are still within the protection scope of the present invention.

Claims (7)

1. measure the instrument of workpiece diameter, it is characterised in that: include that a fixed ruler frame, slip chi frame and one meet work to be measured The ring gauge of part dimensional tolerance, arranges a fixing gauge head on described fixed ruler frame, arranges one on described slip chi frame Individual dial gauge, described dial gauge moves back and forth along the direction at fixing gauge head place under the driving of slip chi frame.

2. the instrument measuring workpiece diameter as claimed in claim 1, it is characterised in that: described fixed ruler frame, slip chi frame are each From all including a horizon bar and the vertical rod being connected with horizon bar one end；The other end of two horizon bars is movable in the horizontal direction to be connected Connecing, two vertical rods are oppositely arranged.

3. the instrument measuring workpiece diameter as claimed in claim 2, it is characterised in that: described fixing gauge head passes through trip bolt It is fixed on inside the vertical rod of fixed ruler frame.

4. the instrument measuring workpiece diameter as claimed in claim 2, it is characterised in that: described dial gauge is solid by trip bolt It is scheduled on inside the vertical rod of slip chi frame.

5. the instrument measuring workpiece diameter as claimed in claim 2, it is characterised in that: in described fixing gauge head and dial gauge Heart line is on same straight line.

6. the instrument measuring workpiece diameter as claimed in claim 2, it is characterised in that: arrange on the horizon bar of fixed ruler frame Fluted, the horizon bar of slip chi frame is embedded in this groove, and both are fixed by regulation screw.

7. utilize the arbitrary described instrument of claim 1-6 to method through measuring in workpiece, it is characterised in that as follows:

The previously fabricated ring gauge identical with part internal diameter size to be measured of step 1., measures the true of ring gauge size with precision instrument Value；

Fixing gauge head is fixed on fixed ruler frame by step 2., is fixed on by dial gauge on slip chi frame；

Step 4 regulates fixed ruler frame and the connector of slip chi frame, in making the ring gauge in fixing gauge head and dial gauge gauge head and step 1 Contacts side surfaces；Tighten connector, fixing slip chi frame and the position of fixed ruler frame, then dial gauge pointer is made zero；

Step 5 uses this instrument to measure part internal diameter to be measured, and now the indicated value on dial gauge is part to be measured relative to ring gauge Deviation value, thus can calculate the actual value of workpiece size.