CN205156826U - Measure instrument of hole cylindricity - Google Patents

Abstract

An instrument for measuring the cylindricity of an inner hole, comprising a support frame, a V-shaped positioning groove is arranged on the support frame, guide rails are respectively installed on the inner and outer sides of the V-shaped positioning groove, sliding bearings are installed on the guide rails, and the sliding bearings are fixed There is a fixed frame, a servo motor is installed on the top of the fixed frame, the servo motor is driven and connected with a horizontally arranged rotating shaft, and a dial indicator is installed on the outer end of the rotating shaft. The utility model has a reasonable structure, the servo motor drives the lifting rod to slide up and down, the rear end of the rotating shaft extends out of the lifting rod and can be installed with a rotating handle, and the rotating shaft drives the dial indicator to rotate to perform error measurement. Measuring the cylindricity of the inner hole of the workpiece is conducive to popularization and use.

Description

Instruments for measuring the cylindricity of inner holes

technical field

The utility model relates to the technical field of mechanical parts detection, in particular to an instrument for measuring the cylindricity of an inner hole.

Background technique

Cylindricity refers to the difference between the maximum dimension and the minimum dimension of any vertical section, and the cylindricity error includes the error of the axial section and the cross section. The tolerance zone of cylindricity is the area between two coaxial cylindrical surfaces, and the radial distance between the two coaxial cylindrical surfaces is the tolerance value.

At present, the methods commonly used to measure the cylindricity error of parts in machining workshops are the two-point method, the coordinate measurement method and the radius measurement method, etc., but these methods are used for the measurement of the cylindricity of the outer circle, not suitable for the measurement The cylindricity of the inner hole, especially the rotary mold products with the inner hole is assembled from two parts, so it is difficult to measure the cylindricity of the inner hole of the product.

Utility model content

The utility model aims to solve the above-mentioned problems in the prior art, and provides an instrument for measuring the cylindricity of the inner hole, which solves the technical problem that the cylindricity of the inner hole is difficult to measure.

The technical scheme adopted by the utility model to solve the technical problem: the instrument for measuring the cylindricity of the inner hole includes a support frame, a V-shaped positioning groove is arranged on the support frame, and guide rails are respectively installed on the inner and outer sides of the V-shaped positioning groove. Sliding bearings are installed on the guide rail, and a fixed frame is fixed between the sliding bearings. A servo motor is installed on the top of the fixed frame. The servo motor is driven and connected with a lifting rod. A dial indicator is installed. The V-shaped positioning groove is used to place the workpiece that needs to measure the cylindricity of the inner hole, and it plays a certain role in fixing the workpiece. The servo motor drives the lifting rod to slide up and down, and the rear end of the rotating shaft extends out of the lifting rod and can be installed with a rotating handle. Drive the dial indicator to rotate to measure the error, and at the same time, the servo motor slides and adjusts the position on the guide rail through the sliding bearing.

For further improvement, a sliding block is slidably installed on the guide rail, and a sliding positioning groove corresponding to the V-shaped positioning groove is provided on the sliding block. The corresponding setting of the sliding positioning groove and the V-shaped positioning groove plays a better role in fixing the workpiece to be measured, and increases the stability of the workpiece during measurement.

Further improvement, the guide rail includes an upper guide rail and a lower guide rail, and the upper guide rail and the lower guide rail pass through the sliding block respectively. The setting of the upper guide rail and the lower guide rail increases the stability of the sliding block and ensures the accuracy of measurement.

For further improvement, the sliding block slides and cooperates with the upper guide rail and the lower guide rail respectively through linear bearings. The setting of the linear bearing makes the sliding cooperation between the sliding block and the upper guide rail and the lower guide rail more smooth.

Further improvement, the support frame includes a base, fixed plates fixed at the left and right ends of the base, and the fixed plate on the left end of the base is provided with the V-shaped positioning groove.

The beneficial effects of the utility model are: the utility model has a reasonable structure, the servo motor drives the lifting rod to slide up and down, the rear end of the rotating shaft extends out of the lifting rod and can be installed with a rotating handle, and the rotating shaft drives the dial indicator to rotate to perform error measurement, which is convenient to use , high measurement accuracy, can effectively measure the cylindricity of the inner hole of the workpiece, and is conducive to popularization and use.

Description of drawings

Fig. 1 is the front view of the utility model;

Fig. 2 is a schematic diagram of the front three-dimensional structure of the utility model;

Fig. 3 is a schematic diagram of the three-dimensional structure of the reverse side of the utility model.

Explanation of reference signs: support frame 1, V-shaped positioning groove 2, guide rail 3, guide rail 3-1, lower guide rail 3-2, sliding bearing 4, fixed frame 5, servo motor 6, rotating shaft 7, dial indicator 8, Sliding block 9, sliding positioning groove 10, base 11, fixed plate 12.

detailed description

Below in conjunction with accompanying drawing, the utility model is further described:

Referring to the accompanying drawings: the instrument for measuring the cylindricity of the inner hole in this embodiment includes a support frame 1, a V-shaped positioning groove 2 is arranged on the support frame 1, and guide rails 3 are respectively installed on the inner and outer sides of the V-shaped positioning groove 2. , sliding bearings 4 are installed on the guide rail 3, a fixed frame 5 is fixed between the sliding bearings 4, a servo motor 6 is installed on the top of the fixed frame 5, the servo motor 6 is driven and connected with a lifting rod 6-1, and a lifting rod 6-1 The rotating shaft 7 that the bottom end of the rotating shaft is horizontally arranged, the outer end of the rotating shaft is equipped with a dial gauge 8. The V-shaped positioning groove 2 is used to place the workpiece that needs to measure the cylindricity of the inner hole, and has a certain fixing effect on the workpiece. The servo motor 6 drives the rotating shaft 7 to drive the dial indicator 8 to rotate to perform error measurement. At the same time, the servo motor 6 passes The slide bearing 4 slides to adjust the position on the guide rail 3.

A sliding block 9 is slidably installed on the guide rail 3 , and a sliding positioning groove 10 corresponding to the V-shaped positioning groove 2 is provided on the sliding block 9 . The corresponding setting of the sliding positioning groove 10 and the V-shaped positioning groove 2 plays a better role in fixing the workpiece to be measured, and increases the stability of the workpiece during measurement. The guide rail 3 includes an upper guide rail 3-1 and a lower guide rail 3-2, and the upper guide rail 3-1 and the lower guide rail 3-2 pass through the sliding block 9 respectively. The setting of the upper guide rail 3-1 and the lower guide rail 3-2 increases the stability of the sliding block 9 and ensures the accuracy of measurement. The sliding block 9 is slidingly matched with the upper guide rail 3-1 and the lower guide rail 3-2 respectively through linear bearings. The setting of the linear bearing makes the sliding cooperation between the sliding 9 pieces and the upper guide rail 3-1 and the lower guide rail 3-2 smoother. The support frame 1 includes a base 11 and a fixing plate 12 fixed on the left and right ends of the base 11 , and the fixing plate 12 on the left end of the base 11 is provided with the V-shaped positioning groove 2 .

Rotary mold products with inner holes are assembled from two parts, so it is difficult to measure the cylindricity of inner holes. The utility model is designed for mold products with inner holes and requirements for shape errors of the inner holes, and can measure the shape errors of the product inner holes such as roundness, cylindricity, and straightness.

Principle: To measure the shape error of inner holes of different sizes, you only need to find the position of the center of the circle, and then turn the dial indicator 8 to obtain the roundness error. Because the workpiece is placed on the V-shaped positioning groove 2, even if the diameter of the part changes, the position of the center of different diameters on the x-axis is always the same, and the change in the position of the center of the circle will only appear on the z-axis.

How to use: First find a standard test piece, that is, a test piece with no deviation in the roundness of the inner hole in theory, assuming that the outer diameter of the test piece is 50mm, and put it on the workbench. Move the dial indicator 8, that is, the entire working frame, until the measuring head of the dial indicator 8 is in contact with the workpiece and has a certain pre-pressure. At this time, turn the dial indicator 8, and the pointer of the dial indicator 8 will not jump theoretically. , that is, there is no roundness error. Then measure the product to be measured. Assuming that the outer diameter of the product is 40mm, according to mathematical knowledge, it can be calculated that the downward movement of the workpiece is 7.0711mm relative to the 50mm workpiece.

Although the present invention has been illustrated and described with reference to preferred embodiments, it will be understood by those skilled in the art that various changes in form and details may be made within the scope of the claims.

Claims (5)

1. An instrument for measuring the cylindricity of the inner hole, comprising a support frame (1), characterized in that: the support frame (1) is provided with a V-shaped positioning groove (2), and in the V-shaped positioning groove (2) Guide rails (3) are respectively installed on the inner and outer sides, slide bearings (4) are installed on the guide rails (3), a fixing frame (5) is fixed between the sliding bearings (4), and a servo motor is installed on the top of the fixing frame (5) (6), the drive of the servo motor (6) is connected with the elevating rod (6-1), the bottom end of the elevating rod (6-1) is equipped with a horizontally arranged rotating shaft (7), and the outer end of the rotating shaft is equipped with a percentage Table (8). 2. The instrument for measuring the cylindricity of the inner hole according to claim 1, characterized in that: a sliding block (9) is slidably installed on the guide rail (3), and the sliding block (9) is provided with a V-shaped positioning groove (2) Corresponding sliding positioning groove (10). 3. The instrument for measuring inner hole cylindricity according to claim 1, characterized in that: said guide rail (3) comprises an upper guide rail (3-1) and a lower guide rail (3-2), and the upper guide rail (3-1 ) and the lower guide rail (3-2) pass through the slide block (9) respectively. 4. The instrument for measuring the cylindricity of the inner hole according to claim 3, characterized in that: the sliding block (9) is slidingly matched with the upper guide rail (3-1) and the lower guide rail (3-2) respectively through linear bearings . 5. The instrument for measuring inner hole cylindricity according to claim 1, characterized in that: the support frame (1) comprises a base (11), fixed plates (12) fixed on the left and right ends of the base (11), the base (11) The fixing plate (12) on the left end is provided with the V-shaped positioning groove (2).