CN204177332U - A kind of Inner arc measurer for curvity radius - Google Patents

Abstract

The utility model discloses a kind of Inner arc measurer for curvity radius.This device comprises measurer body (1), and the shape of measurer body (1) is the T-shaped of mirror writing; Measurer body (1) is provided with center pit (9); Center pit (9) upper end is fixedly connected with gauge outfit (2); Center pit (9) lower end is slidably connected with extension measuring staff (3).The utility model adopts the measurer body of inverted T-shape to coordinate with gauge outfit to form Inner arc radius-of-curvature easy device, the inner arc surface only needing the horizontal component of inverted T-shape to lean against workpiece during measurement just can be measured fast the radius-of-curvature error amount of inner arc surface, be specially adapted to processing site detect, be specially adapted to quality control when producing in enormous quantities, effectively solve the quality control difficult problem produced in enormous quantities and there is inner arc surface product.There is certain dissemination.

Description

A device for measuring the radius of curvature of an inner arc

technical field

The utility model relates to an inner arc curvature radius measuring device, which belongs to the technical field of inner arc curvature radius detection tools.

Background technique

In the machining industry, sometimes the problem of measuring the radius of curvature of the inner arc surface of the workpiece is encountered. The current measurement method is to use special instruments such as three coordinates and tool microscopes for measurement. Although this measurement method has high measurement accuracy, it is troublesome to measure and is suitable for single-piece or small-batch production methods. However, for products requiring 100% inspection rate in mass production, the efficiency of the above-mentioned measurement method is too low, seriously affecting the production schedule, which is obviously unrealistic and uneconomical.

Utility model content

The purpose of this utility model is to provide a measuring device for the radius of curvature of the inner arc to solve the problem of quickly detecting the radius of curvature of the inner arc during mass production, so as to overcome the shortcomings of the prior art.

Technical scheme of the utility model:

A device for measuring the radius of curvature of an inner arc, comprising a measuring device whose shape is an upside-down T-shape; the measuring device is provided with a central hole; the upper end of the central hole is fixedly connected to the meter head; the lower end of the central hole is slidingly connected to the extension measuring rod .

In the aforementioned device for measuring the radius of curvature of an inner arc, the central hole coincides with a specific vertical centerline.

In the aforementioned device for measuring the radius of curvature of an inner arc, the midpoint of the horizontal centerline of the T-shaped quantity is intersected with the vertical centerline of the quantity.

In the aforementioned device for measuring the radius of curvature of an inner arc, the central hole is a through hole that runs through a specific horizontal portion of the T-shaped volume.

In the aforementioned device for measuring the radius of curvature of an inner arc, a zero adjustment knob is provided on the top of the meter head, a meter stem is arranged at the bottom of the meter head, and an elastic measuring head is arranged at the bottom end of the meter stem.

In the aforementioned inner arc curvature radius measuring device, the gauge rod is inserted from the upper end of the central hole, and the gauge body on one side of the gauge rod is provided with a threaded hole, and the gauge rod is fixedly connected to the gauge body through the locking screw in the threaded hole.

In the aforementioned inner arc curvature radius measuring device, one end of the extension measuring rod is a plane, and the other end is a cone, and the plane end of the extension measuring rod is inserted from the lower end of the central hole and connected with the elastic measuring head at the lower end of the gauge rod.

In the aforementioned device for measuring the radius of curvature of an inner arc, both the gauge rod and the extension measuring rod are in clearance fit with the center hole.

In the aforementioned device for measuring the radius of curvature of an inner arc, the cross-section of the specific horizontal part of the T-shaped quantity is a rectangle, and the bottom surface of the rectangle is a reference plane.

In the aforementioned device for measuring the radius of curvature of an inner arc, the two bottom sides in the longitudinal direction are reference sides.

Compared with the prior art, the utility model adopts the inverted T-shaped quantity and cooperates with the meter head to form a simple device for the radius of curvature of the inner arc. When measuring, only the horizontal part of the inverted T-shape needs to be leaned against the inner arc surface of the workpiece. It can quickly measure the error value of the radius of curvature of the inner arc surface, which is especially suitable for on-site inspection of processing, especially for quality control during mass production, and effectively solves the quality control problem of mass production of products with inner arc surfaces . It has certain promotional significance.

Description of drawings

Fig. 1 is the structural representation of the utility model;

Fig. 2 is the concrete structure schematic diagram of quantity;

Fig. 3 is the calibration schematic diagram of the utility model;

Fig. 4 is the application schematic diagram of the present utility model;,

Fig. 5 is a schematic diagram of the utility model.

The marks in the attached drawings are: 1-measurement, 2-meter head, 3-extension measuring rod, 4-zero adjustment knob, 5-meter rod, 6-elastic measuring head, 7-horizontal center line, 8-vertical center Line, 9-center hole, 10-threaded hole, 11-lock screw, 12-reference plane, 13-reference edge, 14-arc surface to be measured, 15-standard gauge block, 16-standard platform.

Detailed ways

The utility model will be further described in detail below in conjunction with the accompanying drawings and embodiments, but not as any limitation to the utility model.

A kind of inner arc curvature radius measuring device, as shown in Fig. 1 and Fig. 2: comprise measuring concrete 1, the shape of measuring concrete 1 is the T font of inverted writing; The measuring concrete 1 is provided with central hole 9; Central hole 9 upper ends and The meter head 2 is fixedly connected; the lower end of the central hole 9 is slidably connected with the extension measuring rod 3 . The central hole 9 coincides with the vertical centerline 8 of the measuring body 1 . The midpoint of the horizontal centerline 7 of the T-shaped quantity concrete intersects with the vertical centerline 8 of the quantity concrete 1. Central hole 9 is the through hole that runs through the specific horizontal part of T font. The top of the meter head 2 is provided with a zero adjustment knob 4 , the bottom of the meter head 2 is provided with a meter stem 5 , and the bottom end of the meter stem 5 is arranged with an elastic measuring head 6 . The table rod 5 is inserted from the center hole 9 upper ends, and the measuring rod 5 on one side is provided with a threaded hole 10, and the table rod 5 is fixedly connected with the measuring rod 1 through the locking screw 11 in the threaded hole 10. One end of the extension measuring rod 3 is a plane, and the other end is a cone. The plane end of the extension measuring rod 3 is inserted from the lower end of the central hole 9 and is connected with the elastic measuring head 6 at the lower end of the meter rod 5 . Both the gauge rod 5 and the extension measuring rod 3 are in clearance fit with the central hole 9 . The cross-section of the specific horizontal part of the T-shaped quantity is a rectangle, and the bottom surface of the rectangle is the reference plane 12 . The two bases in the longitudinal direction of the reference plane 12 are reference sides 13 .

Example

As shown in Figures 1 and 2, this example includes three parts: the measuring body 1, the meter head 2 and the extension measuring rod 3; An elastic measuring head 6 is provided; the shape of the measurement concrete 1 is an inverted T shape, and the midpoint of the T-shaped horizontal centerline 7 coincides with the T-shaped vertical centerline 8; the T-shaped vertical part is provided with a center that runs through the T-shaped horizontal part Hole 9; the table rod 5 of the table head 2 is inserted into the center hole 9 from the upper end, and the amount 1 on one side of the table rod 5 is provided with a threaded hole 10, and the threaded hole 10 is perpendicular to the center hole 9; the threaded hole 10 is provided with a locking Screw 11, table rod 5 is fixedly connected with measuring body 1 through locking screw 11; one end of extension measuring rod 3 is a plane, the other end is a cone, and the plane end of extension measuring rod 3 is inserted into central hole 9 from the lower end and connected with table rod 5 The elastic measuring head 6 at the lower end is in contact; the table rod 5 and the extension measuring rod 3 are all in clearance fit with the center hole 9 . The cross-section of the specific horizontal part of the T-shaped measurement is rectangular, and the bottom surface of the rectangle of the specific horizontal part of the measurement is the reference plane 12 . The two bases in the longitudinal direction of the reference plane 12 are reference sides 13 .

Measuring method of the utility model

Before the measurement, the meter head needs to be calibrated earlier. During calibration, as shown in Figure 3, two blocks with a height of H are placed on the standard platform 16 earlier. ₀ the reference gauge block 15, and then insert the cone of the extended measuring rod 3 downward from the reference surface 12 below the measurement concrete 1 into the center hole 9, and then place the reference surface 12 of the measurement concrete 1 on the two reference gauge blocks 15 , the extended measuring rod 3 cannot be in contact with the reference gauge block 15 when placed. Then insert the gauge stem 5 at the bottom of the gauge 2 from the top of the center hole 9, and press the gauge 2 slightly, so that the elastic measuring head 6 at the end of the gauge stem 5 is retracted into the gauge stem 5 to about 1/2 depth. The method of judging the depth of the retraction of the elastic probe 6 to the stem 5 is about 1/2, you can look at the pointer of the gauge 2, when the pointer is at about 1/2 of the range, it is the retraction gauge of the elastic probe 6 at the end of the stem 5 Rod 5 is about 1/2 the depth. Then use the locking screw 11 to fix the watch rod 5 so that it cannot move freely in the axial direction. Then adjust the 0 position on the dial to align with the pointer through the zero adjustment knob 4 on the top of the meter head 2. At this point, the calibration of the gage is completed. When measuring the same batch, it generally only needs to be calibrated once before the measurement can be performed.

When measuring, as shown in FIG. 4 , directly place the reference sides 13 at both ends of the reference plane 12 under the measuring body 1 on the arc surface 14 to be measured. When placing, it must be ensured that the length direction of the datum surface 12 is perpendicular to the axial direction of the measured arc surface 14. The method for judging whether it is vertical is to ensure that the reference sides 13 at the two ends of the datum surface 12 are closely spaced between the measured arc surface 14. Fits snugly without leaving gaps. Because the elastic probe 6 at the lower end of the watch rod 2 is elastic, it protrudes outwards under the action of the inner spring of the watch rod, and contacts with the bottom surface of the measured arc surface 14 . At this time, read the offset Δa of the pointer relative to 0 o’clock, the offset Δa and the height H of the reference gauge block 15 ₀ The sum is the chord height H= of the measured arc surface 14. Put the chord length L and chord height H into the formula R=H/2 +L ² /8H can calculate the curvature radius R of the measured arc. Or according to the upper and lower tolerance requirements of the radius of curvature R, directly calculate the tolerance range of the offset △a of the measured arc surface 14. During the inspection, as long as the measured offset △a is within the tolerance range, it is qualified Parts that exceed the tolerance range are unqualified parts.

In the specific measurement, if it is required to measure the accurate curvature radius R for each workpiece in the batch, according to the measurement range, a certain offset △a at each interval, according to the formula R=H/2 +L in advance ² /8H calculates the corresponding radius of curvature R, and makes a corresponding table of offset △a and radius of curvature R as shown in Table 1.

The radius of curvature R of the measured arc surface 14 is obtained by directly looking up the table through the measured offset Δa.

Measurement example

The radius of the measured arc is R2.5 0 -0.05mm, and the length of the specific reference plane is known to be L=4.692mm. The height of the standard gauge block is known H ₀ =1.670mm, calculate the arc radius R corresponding to the standard gauge block ₀ =2.483mm.

If the measured offset △a of the measured arc surface 14=+0.053, then the chord height Hn of the measured arc surface 14=offset △a+standard gauge block height H ₀ =1.723mm. It can be found from Table 1 that the radius of curvature R of the measured arc surface 14 should be between 2.458 and 2.460 mm, and it can be determined that the curvature radius R of the measured arc surface 14 should be 2.459 mm.

If the gauge head is replaced with a digital gauge head, the measurement data can also be directly connected to the single-chip microcomputer, and the single-chip microcomputer performs calculations to directly display the radius of curvature R of the measured arc surface 14 .

Working principle of the utility model

As shown in Figure 5, points A and C in the figure are the intersection points of the reference side 13 at the two ends of the reference plane 12 and the measured arc surface 14, and point B in the figure is the cone at the bottom end of the extended measuring rod and the measured arc surface 14, point D is the midpoint of the line connecting point A and point C (namely the chord length L), point O is the center of the arc surface 14 to be measured, and H is the distance between point D and point B (namely the chord length L). The measuring arc surface 14 corresponds to the chord height between point A and point C), and R is the radius of curvature of the arc surface 14 to be measured.

It can be seen from Figure 5 that the triangle OAD is a right triangle, therefore, R ² = (AD) ² + (OD) ² , where: AD=1/2L, OD=R-H. Namely: R ² = (1/2L) ² +(R-H) ² ; by R ² = (1/2L) ² +(R-H) ² Available: R=H/2+L ² /8H.

By the formula R=H/2+L ² /8H It can be seen that as long as the chord length L and the chord height H are known, the curvature radius R of the measured arc surface 14 can be calculated. Among them: the chord length L is the length (known) of measuring the specific reference plane, and the chord height H is the height H of the standard gauge block 15 ₀ + The measured offset △a of the measured arc surface 14, that is: H=H ₀ +△a. Among them: the height H of the standard gauge block 15 ₀ (known), so as long as the offset Δa of the measured arc surface 14 is measured, the curvature radius R of the measured arc surface 14 can be calculated.

The utility model adopts the inverted T-shaped quantity and cooperates with the meter head to form a simple device for the curvature radius of the inner arc. When measuring, only the horizontal part of the inverted T-shaped is leaned against the inner arc surface of the workpiece to quickly measure the inner circle. The error value of the curvature radius of the arc surface is especially suitable for on-site inspection of processing, especially for quality control during mass production, and effectively solves the quality control problem of mass production of products with inner arc surfaces. It has certain promotional significance.

Claims (10)

1. A measuring device for the radius of curvature of an inner arc, characterized in that: it includes a specific quantity (1), the shape of which is an inverted T-shape; the specific quantity (1) is provided with a central hole (9); The upper end of the center hole (9) is fixedly connected with the meter head (2); the lower end of the center hole (9) is slidably connected with the extension measuring rod (3). 2 . The device for measuring the radius of curvature of an inner arc according to claim 1 , characterized in that: the central hole ( 9 ) coincides with the vertical centerline ( 8 ) of the measuring body ( 1 ). 3. The device for measuring the radius of curvature of an inner arc according to claim 2, characterized in that: the midpoint of the horizontal centerline (7) of the T-shaped volume concrete intersects the vertical centerline (8) of the volume concrete (1). 4 . The device for measuring the radius of curvature of an inner arc according to claim 3 , characterized in that: the central hole ( 9 ) is a through hole that runs through a specific horizontal portion of the T-shape. 5. The device for measuring the radius of curvature of an inner arc according to claim 4, characterized in that: the top of the meter head (2) is provided with a zero adjustment knob (4), and the bottom of the meter head (2) is provided with a meter rod (5) , the bottom end of the table rod (5) is provided with an elastic measuring head (6). 6. The device for measuring the radius of curvature of an inner arc according to claim 5, characterized in that: the gauge rod (5) is inserted from the upper end of the center hole (9), and the amount on one side of the gauge rod (5) is specifically on (1) A threaded hole (10) is provided, and the watch rod (5) is fixedly connected with the measuring body (1) through the locking screw (11) in the threaded hole (10). 7. The device for measuring the radius of curvature of an inner arc according to claim 6, characterized in that: one end of the extension measuring rod (3) is a plane, the other end is a cone, and the plane end of the extension measuring rod (3) passes through the central hole (9) The lower end is inserted and connected in contact with the elastic probe (6) at the lower end of the meter rod (5). 8 . The device for measuring the radius of curvature of an inner arc according to claim 7 , characterized in that: both the gauge rod ( 5 ) and the extension measuring rod ( 3 ) are in clearance fit with the central hole ( 9 ). 9. The device for measuring the radius of curvature of an inner arc according to claim 8, characterized in that: the cross-section of the specific horizontal part of the T-shaped quantity is a rectangle, and the bottom surface of the rectangle is a reference plane (12). 10. The device for measuring the radius of curvature of an inner arc according to claim 9, characterized in that: the two bases in the direction of the reference plane (12) are reference sides (13).