CN206019529U - The survey mass and device of measurement hole chamber bottom size - Google Patents

Abstract

The utility model provides a measuring block and a device for measuring the size of the bottom of a pit cavity. The measuring block includes a small bottom surface, a large bottom surface and an inclined surface connecting the small bottom surface and the large bottom surface; the small bottom surface is in contact with the bottom surface of the pit cavity, and the edge where the large bottom surface intersects the inclined surface is the edge for measurement, and it is in contact with the measured side wall of the pit cavity. touch. The device for measuring the size of the bottom of the pit cavity includes: two aforementioned measuring blocks for positioning in the pit cavity; an inclination measuring instrument for measuring draft angles θ ₁ and θ of the measured opposite side walls of the pit cavity ₂ ; and an image measuring instrument, used for measuring the distance L ₀ between the measuring edges of the two measuring blocks positioned in the pit cavity. The measuring block has the advantages of simple structure, easy processing and manufacture, low manufacturing cost and convenient maintenance. Using the device for measuring the size of the pit bottom of the utility model, first directly measure the size of the non-rounded or chamfered position on the side wall of the pit cavity, and then obtain the pit cavity with rounded corners or chamfers through the conversion formula The actual bottom size enables accurate measurement of the bottom size of the pit cavity.

Description

Measuring block and device for measuring pit bottom size

technical field

The utility model relates to a measuring tool, in particular to a measuring block and a device for measuring the bottom size of a pit cavity.

Background technique

Figure 1 is a schematic diagram of the cavity of the tested object; Figure 2 is a top view of the cavity of the tested component.

In the field of mechanical processing, vernier calipers and video measuring instruments are often used to measure the size of the cavity 1 of the test piece. The transition part 13 of the side wall 12 often has rounded corners or chamfers, so that it is impossible to make the transition part 13 disappear and form an absolute corner between the bottom surface 11 and the side wall 12. It is difficult to realize the pit cavity by using these two measurement methods. 1, it is impossible to judge whether the tested part meets the designed size specification.

The vernier caliper measurement method is used, and its accuracy is greatly affected by factors such as the operator's operating habits and operating strength. Due to the influence of rounded or chamfered corners, the repeatability and reproducibility of the caliper measurement method is very poor.

Using the image measurement method, due to the influence of the rounded corners or chamfers of the edges of the pit cavity, the measurement reference line cannot be found in the image, and the accurate measurement of the pit cavity size cannot be realized.

Utility model content

In view of the defects in the prior art, the purpose of this utility model is to provide a measuring block and a device for measuring the bottom size of the pit cavity, which can realize accurate measurement of the bottom size of the pit cavity.

In order to achieve the above object, in the first aspect, the utility model provides a measuring block for measuring the size of the bottom of the pit cavity. Form rounded corners or chamfers, and the two sides of the measured wall are inclined; the measuring block includes a small bottom surface, a large bottom surface, and a slope connecting the small bottom surface and the large bottom surface; The edge is an edge for measurement, and the edge for measurement is used to contact the corresponding measured side wall of the pit cavity.

In order to achieve the above object, in the second aspect, the utility model provides a device for measuring the bottom size of the pit cavity, which includes two measuring blocks according to the first aspect of the utility model, for positioning in the pit cavity; A bevel measuring instrument for measuring the draft angles θ ₁ and θ ₂ of the measured opposite side walls of the pit cavity; and a video measuring instrument for measuring the measurement of two measuring blocks positioned in the pit cavity The distance L ₀ between the edges.

The beneficial effects of the utility model are as follows:

The measuring block of the utility model has the advantages of simple structure, easy processing and manufacture, low manufacturing cost and convenient maintenance. The device for measuring the bottom size of the pit cavity composed of the measuring block of the utility model first directly measures the size of the non-rounded corner or chamfered position on the measured side wall of the pit cavity, and then obtains the rounded corner through the conversion formula Or the inner length or inner width dimension of the actual bottom of the chamfered cavity, so as to realize the accurate measurement of the bottom size of the cavity.

Description of drawings

Fig. 1 is the schematic diagram of the pit cavity of the tested part;

Fig. 2 is a top view of the pit cavity of the tested part;

Fig. 3 is the three-dimensional view of the measuring block of measuring pit cavity bottom size of the utility model;

Fig. 4 is the front view of Fig. 3;

Fig. 5 is the assembly diagram of the measuring block for measuring the bottom size of the pit cavity and the pit cavity of the tested part of the utility model;

Fig. 6 is the sectional view that Fig. 5 is made along A-A;

Fig. 7 is a partially enlarged view of Fig. 6, wherein, for the sake of illustration, only the positional relationship between the measuring block on the left side of Fig. 6 and the corresponding left side wall of the cavity is shown.

Wherein, the reference signs are explained as follows:

1 cavity

11 Bottom

12 side walls

121 Edges of side walls

13 Transition parts

2 measuring blocks

21 small base

211 small base edge

22 large base

221 Large base edge

23 slopes

24 Measuring edges

P13 Innermost horizontal position of the transition

P21 The position closest to the slope where the small bottom surface of the measuring block contacts the bottom surface of the pit cavity

B1 first half

B2 second half

detailed description

The measuring block and device for measuring the size of the bottom of the pit cavity according to the present invention will be described in detail below with reference to the accompanying drawings.

Firstly, the measuring block for measuring the size of the bottom of the pit cavity according to the first aspect of the present utility model will be described.

Referring to Figures 1 to 7, in the measuring block 2 for measuring the bottom size of a pit cavity according to the first aspect of the present invention, the pit cavity 1 includes a bottom surface 11 and opposite side walls 12, and the bottom surface 11 and the measured opposite side walls The transition part 13 between 12 forms rounded corners or chamfers, and the measured side walls 12 are inclined; the measuring block 2 includes a small bottom surface 21, a large bottom surface 22, and an inclined surface 23 connecting the small bottom surface 21 and the large bottom surface 22; the small bottom surface 21 is used In contact with the bottom surface 11 of the pit cavity 1 , the edge where the large bottom surface 22 intersects the inclined surface 23 is a measuring edge 24 , and the measuring edge 24 is used to contact the corresponding measured side wall 12 of the pit cavity 1 .

The measuring block of the utility model has the advantages of simple structure, easy processing and manufacture, low manufacturing cost and convenient maintenance. The device for measuring the size of the bottom of the pit cavity formed by the measuring block of the utility model is used to directly measure the size of the non-rounded or chamfered position on the measured side wall 12 of the pit cavity 1, and then through the conversion formula The inner length or inner width of the actual bottom of the pit cavity 1 with rounded corners or chamfers is obtained, so as to realize accurate measurement of the bottom size of the pit cavity 1 .

In the measuring block 2 for measuring the bottom size of the pit cavity, the height H of the edge 24 for measurement is not lower than the height of the transition part 13, and the position P21 closest to the slope 23 where the small bottom surface 21 contacts the bottom surface 11 of the pit cavity 1 is the same as the transition point. The innermost horizontal position P13 of the part 13 coincides with or is located outside the innermost horizontal position P13 of the transition part 13; the height of the measuring edge 24 is not lower than the height of the transition part 13; the length of the measuring edge 24 is less than the measured side wall The length of the edge 121 of 12.

It is supplemented here that the fillet or chamfer radius formed by the transition part 13 between the bottom surface 11 of the pit cavity 1 and the opposite side walls 12 to be tested is R; the draft angle of the two side walls 12 to be tested is The angles are θ ₁ and θ ₂ respectively, the depth of the pit cavity 1 is D, the angle formed by the large bottom surface 22 of the measuring block 2 and the inclined surface 23 is α, the length of the edge 211 of the small bottom surface 21 is L ₁ , and the length of the large bottom surface 22 The length of the edge 221 is L ₂ , and the height of the edge 24 for measurement is H.

Referring to Fig. 7 (for the sake of illustration, only the positional relationship between the measuring block on the left side of Fig. 6 and the left side wall of the corresponding cavity is shown, but the positional relation requirements in Fig. 7 are also applicable to the measurement on the right side of Fig. 6 block and the right side wall of the corresponding pit cavity), when designing the measuring block 2 with the function of measuring the bottom size of the pit cavity 1, it is necessary to satisfy the closest inclined surface where the small bottom surface 21 contacts the bottom surface 11 of the pit cavity 1 The position P21 of 23 coincides with the innermost horizontal position P13 of the transition part 13 or is located outside the innermost horizontal position P13 of the transition part 13, then for the opposite side walls 12 to be measured, it is necessary to ensure that the bottom of the bottom surface 11 of the pit cavity 1 The distance from the point of intersection of the extension line of the edge and the extension line of the edge of the measured side wall 12 to the position P21 closest to the slope 23 where the small bottom surface 21 of the measuring block 2 contacts the bottom surface 11 of the pit cavity 1 is not less than the distance of the pit cavity 1 The distance from the intersection of the extension line of the bottom edge of the bottom surface 11 and the measured extension line of the edge of the side wall 12 to the innermost horizontal position P13 of the transition part 13. Then for the opposite side walls 12 to be tested, the following conditions must be satisfied simultaneously:

(H/tanα-H·tanθ ₁ )≥(R·cosθ ₁ -R·(1-sinθ ₁ )·tanθ ₁ )

and (H/tanα-H·tanθ ₂ )≥(R·cosθ ₂ -R·(1-sinθ ₂ )·tanθ ₂ )

Then there are further:

H≥R·(cosθ ₁ -(1-sinθ ₁ )·tanθ ₁ )/(1/tanα-tanθ ₁ )

and H≥R·(cosθ ₂ -(1-sinθ ₂ )·tanθ ₂ )/(1/tanα-tanθ ₂ ),

remember:

M ₁ =R·(cosθ ₁ -(1-sinθ ₁ )·tanθ ₁ )/(1/tanα-tanθ ₁ )

M ₂ ＝R·(cosθ ₂ -(1-sinθ ₂ )·tanθ ₂ )/(1/tanα-tanθ ₂ )

That is to say, the height H of the measuring edge 24 of the measuring block 2 satisfies the relationship:

H≥max(M ₁ , M ₂ ).

Referring to Fig. 7, when designing the measuring block 2 with the function of measuring the bottom size of the pit cavity 1, the height H of the measuring edge 24 must not be lower than the height of the transition part 13, and at the same time, it is necessary to ensure that the measuring edge 24 The height H is not lower than the height R·(1-sinθ ₁ ) and R·(1-sinθ ₂ ) of the transition portion 13 of the measured opposite side walls 12, that is, the relationship is satisfied:

H≥max(R·(1-sinθ ₁ ),R·(1-sinθ ₂ ))

Simultaneously, the height H of the edge 24 for measurement is to be less than the height D of the pit cavity 1, which satisfies:

H<D.

In order to prevent the measuring block 2 from turning over and falling in the direction close to the side wall 12 of the pit cavity to be measured, as shown in FIG. The dotted line perpendicular to the small bottom surface 21 divides the measuring block 2 into a first half B1 and a second half B2, wherein the first half B1 contains a slope 23; the bottom surface 21 is closest to the bottom surface 11 of the pit cavity 1 The position P21 of the slope 23 is used as a fulcrum, and the moment of the center of gravity of the first half B1 to the fulcrum is not greater than the moment of the second half B2 to the fulcrum, thereby preventing the measuring block 2 from turning over and falling in the direction close to the side wall 12 of the corresponding pit cavity . When the measuring block 2 is a right-angled trapezoidal block, that is, the cross-section of the measuring block 2 is a right-angled trapezoid (the right-angled trapezoid here has a broad meaning, both including a right-angled trapezoid that strictly conforms to the geometric definition, and can also include the edge 24 except for the measurement. Other corners can have the actual shape of the chamfer (as shown in Figure 7)), at this time the length of the edge 211 of the small bottom surface 21 and the length of the edge 221 of the large bottom surface 22 satisfy the relationship

For the measuring block 2 , in order to ensure the close contact between the small bottom surface 21 of the measuring block 2 and the bottom surface 11 of the cavity 1 , the surface roughness of the small bottom surface 21 is not greater than 0.05 μm.

In order to increase the smoothness of the measuring edge 24 to be in close contact with the side wall 12 of the cavity 1, the measuring edge 24 is provided with a chrome-plated layer (not shown), and the straightness of the measuring edge 24 is not greater than 0.01 mm.

As for the material selection of the measuring block 2, the material of the measuring block 2 can be steel or ceramic material.

The device for measuring the size of the pit bottom according to the second aspect of the present invention will be described below.

The device for measuring the size of the pit bottom according to the second aspect of the utility model includes: two measuring blocks 2 according to the first aspect of the utility model, which are used to be positioned in the pit cavity 1; an inclination measuring instrument (not shown ), used to measure the draft angles θ ₁ and θ ₂ of the measured opposite side walls 12 of the cavity 1; and a video measuring instrument (not shown), used to measure the two The distance L ₀ between the measuring edges 24 of the block 2 is measured.

The following supplementary description adopts the process of measuring the device measuring the bottom size of the pit cavity of the present utility model, specifically:

S1, measure the draft angles θ ₁ and θ ₂ of the measured opposite side walls 12 of the pit cavity respectively with an inclination measuring instrument;

S2, placing pit cavity 1 on the working platform of the image measuring instrument, and positioning it;

S3, place the small bottoms 21 of the two measuring blocks 2 downwards on the bottom 11 of the pit cavity, and adjust the two measuring blocks 2 respectively so that the measuring edges 24 where the large bottoms 22 intersect with the inclined plane 23 are respectively aligned with the measured edges. The opposite side walls 12 are in close contact;

S4, measure the distance L ₀ between the measuring edges 24 of the two measuring blocks 2 adjusted in step S3 with a video measuring instrument;

S5, substituting L ₀ into the conversion formula L=L ₀ −H·tanθ ₁ −H·tanθ ₂ , where L is the actual size of the measured inner length or inner width of the bottom of the cavity 1 .

Claims (10)

1. a kind of survey mass (2) of measurement hole chamber bottom size, cheats chamber (1) including bottom surface (11) and two lateral walls (12), bottom Intermediate location (13) between face (11) and tested two lateral walls (12) forms fillet or chamfering, and tested two side (12) incline Tiltedly；

Survey mass (2) includes the inclined-plane of little bottom surface (21), big bottom surface (22) and connection little bottom surface (21) and big bottom surface (22) (23)；

Characterized in that,

Little bottom surface (21) are used for contacting with the bottom surface (11) in hole chamber (1), and the seamed edge that big bottom surface (22) are intersected with inclined-plane (23) is survey Amount seamed edge (24), measurement seamed edge (24) are used for corresponding tested side wall (12) contact with hole chamber (1).

2. the survey mass (2) of chamber bottom size is cheated in measurement according to claim 1, it is characterised in that

The height of measurement seamed edge (24) is not less than the height of intermediate location (13)；

The position (P21) closest to inclined-plane (23) and intermediate location that little bottom surface (21) are contacted with the bottom surface (11) in hole chamber (1) (13) most interior horizontal level (P13) overlaps or is located at most interior horizontal level (P13) of intermediate location (13) outward；

Measurement is less than the length of the seamed edge (121) of tested side wall (12) with the length of seamed edge (24).

3. the survey mass (2) of chamber bottom size is cheated in measurement according to claim 1, it is characterised in that

By the position (P21) closest to inclined-plane (23) that contacts of bottom surface (11) in little bottom surface (21) and hole chamber (1) and perpendicular to Survey mass (2) is divided into the first half portion (B1) and the second half portion (B2) by the dotted line of little bottom surface 21, and wherein the first half portion (B1) contains Inclined-plane (23)；

Wherein, the position (P21) closest to inclined-plane (23) that contacts of bottom surface (11) using little bottom surface (21) and hole chamber (1) is used as propping up Point, the center of gravity moment about point of support of the first half portion (B1) are not more than the second half portion (B2) moment about point of support.

4. the survey mass (2) of chamber bottom size is cheated in measurement according to claim 1, it is characterised in that the horizontal stroke of survey mass (2) Section is right-angled trapezium.

5. the survey mass (2) of chamber bottom size is cheated in the measurement according to claim 3 or 4, it is characterised in that

Seamed edge (211) length of little bottom surface (21) is L₁, seamed edge (221) length of big bottom surface (22) is L₂, the rib of little bottom surface (21) The length on side (211) meets relation with the length of the seamed edge (221) of big bottom surface (22)：

$L_1<L_2<(1+\sqrt{3})L_1.$

6. the survey mass (2) of chamber bottom size is cheated in measurement according to claim 1, it is characterised in that little bottom surface (21) Surface roughness is not more than 0.05 μm.

7. the survey mass (2) of chamber bottom size is cheated in measurement according to claim 1, it is characterised in that measurement seamed edge (24) linearity is not more than 0.01mm.

8. the survey mass (2) of chamber bottom size is cheated in measurement according to claim 1, it is characterised in that the material of survey mass (2) Expect for steel or ceramic material.

9. the survey mass (2) of chamber bottom size is cheated in measurement according to claim 1, it is characterised in that measurement seamed edge (24) chromium coating is provided with.

10. the device of chamber bottom size is cheated in a kind of measurement, including：

Two survey mass (2) according to any one of claim 1-9, for being positioned in hole chamber (1)；

Oblique angle measuring instrument, for measuring the withdrawing pattern bevel angle θ of the tested two lateral walls (12) in hole chamber (1)₁And θ₂；And

Image measurer, for measurement and positioning hole chamber (1) in two survey mass (2) measurement between seamed edge (24) away from From L₀.