Gauge and measuring method for measuring distance from sphere center of concave spherical surface of part to end face of inner hole

Abstract

A gauge for measuring the distance from the center of a concave spherical surface of a part to the end face of an inner hole comprises a measuring shaft and a positioning sleeve, the measuring shaft is a stepped shaft, the lower end of the measuring shaft is a spherical shaft, the diameter of the spherical shaft is the same as that of the concave spherical surface of the part, the middle section of the measuring shaft is a measuring section with the diameter the same as that of the spherical shaft, and a small-diameter section at the upper end of the measuring shaft is a handheld part. The positioning sleeve is in a stepped cylinder shape, a through hole allowing the large-diameter section of the measuring shaft to penetrate through is axially formed in the center of the positioning sleeve, the small-diameter section of the positioning sleeve is a positioning section making contact with the end face of an inner hole of a part, the large-diameter section of the positioning sleeve is a limiting section, and the spherical shaft of the measuring shaft penetrates through the through hole of the positioning sleeve to be in clearance fit with the positioning sleeve. The gauge can reduce the rejection rate of products and improve the production efficiency of the products.

Description

Technical Field

[0001] The invention relates to the field of mechanical processing measuring tools, and in particular to a gauge for measuring the distance from a concave spherical surface of a part to an end face of an inner hole and a measuring method. Background Art

[0002] In some special machines, a spherical part rotation reversing system is used, and its core part is a concave spherical part. Figure 1 As shown, the concave spherical part 4 has a concave spherical surface (4-1), an inner hole (4-2) coaxial with the center of the concave spherical surface, and the lower end face F of the inner hole (4-2) is above the center of the concave spherical surface (4-1) at a distance L. The distance (L) from the center of the concave spherical surface to the end face of the inner hole has a minimum distance dimension and a maximum distance dimension, as well as a tolerance range. In use, whether the distance (D) from the center of the concave spherical surface to the end face of the inner hole is qualified is very important, and is also a technical problem in measurement. However, there is currently no distance gauge with a reasonable structure to measure whether the distance (L) from the center of the concave spherical surface to the end face of the inner hole is qualified. The usual practice is to remove the concave spherical part (4) from the machine tool after machining, and then measure the distance (L) from the center of the concave spherical surface to the end face of the inner hole on a three-coordinate measuring machine. Since it cannot be measured directly on the machine tool, it needs to be removed for measurement, so the measurement efficiency is low. At the same time, since it is impossible to measure directly on the machine tool after processing to determine whether it is qualified, it is very likely that the product has exceeded the qualified range before it is taken down for measurement by a three-coordinate measuring machine, which can easily cause scrapping and a low pass rate. Summary of the invention

[0003] The purpose of the present invention is to provide a gauge and a measuring method for measuring the distance from the center of the concave spherical surface of a part to the end face of the inner hole in order to solve the corresponding deficiencies of the prior art. The gauge can reduce the scrap rate of products and improve product production efficiency.

[0004] The objective of the present invention is achieved by adopting the following scheme: a gauge for measuring the distance from the center of the concave spherical surface of a part to the end face of the inner hole, comprising a measuring shaft and a positioning sleeve, wherein the measuring shaft is a stepped shaft, the lower end of the measuring shaft is a spherical shaft, the diameter of the spherical shaft is the same as the diameter of the concave spherical surface of the part, the middle section of the measuring shaft is a measuring section with the same diameter as the spherical shaft, the upper end small diameter section of the measuring shaft is a handheld part, the positioning sleeve is a stepped cylindrical shape, a through hole is arranged in the central axial direction of the positioning sleeve so that the large diameter section of the measuring shaft can pass through, the small diameter section of the positioning sleeve is a positioning section in contact with the end face of the inner hole of the part, and the large diameter section of the positioning sleeve is a positioning section in contact with the end face of the inner hole of the part. The segment is a limit segment, the spherical axis of the measuring shaft passes through the through hole of the positioning sleeve and is clearance-matched with the positioning sleeve, the distance from the center of the spherical axis of the measuring shaft to the lower end face of the positioning sleeve is the distance from the center of the concave spherical surface of the part to the end face of the inner hole, and the upper end of the positioning sleeve is divided into a left end face and a right end face parallel to each other, the distance from the upper end face of the left end face to the upper end face of the right end face is the difference between the maximum and minimum values ​​of the distance from the center of the concave spherical surface of the part to the end face of the inner hole, and the distance from the center of the spherical axis of the measuring shaft to the upper end face of the measuring segment is the distance from the lower end face of the positioning sleeve to the right end face of the upper end of the positioning sleeve.

[0005] An axially extending limit groove is arranged on the outer circumference of the upper end of the measuring section of the measuring shaft, and a threaded hole extending axially along the limit section and penetrating the wall is arranged on the wall of the limit section of the positioning sleeve. The threaded hole corresponds to the limit groove on the measuring shaft, and the limit screw is installed in the limit groove after passing through the threaded hole.

[0006] The axial length of the limiting groove is 2 to 3 mm greater than the diameter of the limiting screw.

[0007] The distance from the lower end face of the positioning sleeve to the left end face of the upper end of the positioning sleeve is greater than the inner hole depth of the part by 24 to 26 mm, the depth of the positioning section of the positioning sleeve is greater than the inner hole depth of the part by 2 to 5 mm, and the outer diameter of the positioning section of the positioning sleeve is smaller than the diameter of the inner hole of the part by 1 to 2 mm.

[0008] The outer surface of the handheld portion of the measuring shaft is provided with textures for increasing friction.

[0009] A measuring method for measuring the distance from the center of a concave spherical surface of a part to the end face of an inner hole with a gauge comprises the following steps: 1) Place the lower end of the locating sleeve that has been installed in the measuring shaft into the inner hole of the part, so that the lower end surface of the locating sleeve is in full contact with the inner hole of the part; 2) Move the measuring axis downwards so that the spherical section of the measuring axis fully contacts the concave spherical surface of the part until the measuring axis cannot move. 3) Qualification judgment: If the upper end surface of the measuring section is located between the left end surface and the right end surface of the upper end of the positioning sleeve, the part is qualified; if the upper end surface of the measuring section is flush with the left end surface of the upper end of the positioning sleeve, the part is qualified, and the distance from the center of the concave spherical surface of the part to the end surface of the inner hole is the maximum value; if the upper end surface of the measuring section is flush with the right end surface of the upper end of the positioning sleeve, the part is qualified, and the distance from the center of the concave spherical surface of the part to the end surface of the inner hole is the minimum value; If the upper end surface of the measuring section is higher than the left end surface of the upper end of the positioning sleeve or lower than the right end surface of the upper end of the positioning sleeve, the part is unqualified.

[0010] The advantages of the present invention are that the gauge has a simple structure, is easy to manufacture, and is simple to operate. It can improve the production efficiency of parts during mass production of parts, and can measure the parts 100%, so that the qualified rate of the produced parts reaches 100%. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a schematic diagram of the structure of the present invention; Figure 2 This is a schematic diagram of the measuring axis structure; Figure 3 It is a schematic diagram of the parts structure; Figure 4 This is a schematic diagram of the gauge working process. DETAILED DESCRIPTION

[0012] like Figures 1 to 4As shown, a gauge for measuring the distance from the center of a concave spherical surface to the end face of an inner hole comprises a measuring shaft 1 and a positioning sleeve 2. The measuring shaft 1 is a stepped shaft, the lower end of the measuring shaft 1 is a spherical shaft 1-1, the diameter of the spherical shaft 1-1 is the same as the diameter of the concave spherical surface of a part 4, the middle section of the measuring shaft 1 is a measuring section 1-2 having the same diameter as the spherical shaft 1-1, the upper end small diameter section of the measuring shaft 1 is a hand-held part 1-3, and the outer surface of the hand-held part 1-3 of the measuring shaft 1 is provided with a texture for increasing friction. The positioning sleeve 2 is a stepped cylindrical shape, and a through hole 2-1 is set in the central axial direction of the positioning sleeve 2 so that the large diameter section of the measuring shaft 1 can pass through. The small diameter section of the positioning sleeve 2 is the positioning section 2-2 that contacts the inner hole end face F of the part 4, and the large diameter section of the positioning sleeve 2 is the limiting section 2-3. The spherical shaft 1-1 of the measuring shaft 1 passes through the through hole 2-1 of the positioning sleeve 2 and is clearance-matched with the positioning sleeve 2. An axially extending limiting groove 1-4 is set on the outer circumference of the upper end of the measuring section 1-2 of the measuring shaft 1. A threaded hole 2-4 extending axially along the limiting section 2-3 and penetrating the cylinder wall is set on the cylinder wall of the limiting section 2-3 of the positioning sleeve 2. The threaded hole 2-4 corresponds to the limiting groove 1-4 on the measuring shaft 1, and the limiting screw 3 passes through the threaded hole 2-4 and is installed in the limiting groove 1-4. The axial length of the limiting groove 1-4 is greater than the diameter of the limiting screw 3 by 2 to 3 mm. The setting of the limit screw 3 can make the measuring shaft 1 and the positioning sleeve 2 fit tightly, so that the measuring shaft 1 will not fall when the gauge is not in use. The distance L1 from the center of the spherical shaft 1-1 of the measuring shaft 1 to the lower end face of the positioning sleeve 2 is the distance L from the center of the concave spherical surface of the part 4 to the end face F of the inner hole. The upper end of the positioning sleeve 2 is divided into a left end face B and a right end face C that are parallel to each other. The distance L2 from the upper end face of the left end face B to the upper end face of the right end face C is the difference between the maximum and minimum values ​​of the distance L from the center of the concave spherical surface 4-2 of the part 4 to the end face F of the inner hole 4-1. The distance L3 from the center of the spherical shaft 1-1 of the measuring shaft 1 to the upper end face D of the measuring section 1-2 is the distance L4 from the lower end face A of the positioning sleeve 2 to the upper right end face C of the positioning sleeve 2. The distance from the lower end surface of the positioning sleeve 2 to the left end surface B of the upper end of the positioning sleeve 2 is greater than the depth of the inner hole 4-1 of the part 4 by 24 to 26 mm, the depth of the positioning section 2-2 of the positioning sleeve 2 is greater than the depth of the inner hole of the part 4 by 2 to 5 mm, and the outer diameter of the positioning section 2-2 of the positioning sleeve 2 is smaller than the diameter of the inner hole 4-1 of the part 4 by 1 to 2 mm.

[0013] A measuring method for measuring the distance from the center of a concave spherical surface of a part to the end face of an inner hole with a gauge, characterized in that it comprises the following steps: 1) Place the lower end of the locating sleeve that has been installed in the measuring shaft into the inner hole of the part, so that the lower end surface of the locating sleeve is in full contact with the inner hole of the part; 2) Move the measuring axis downwards so that the spherical section of the measuring axis fully contacts the concave spherical surface of the part until the measuring axis cannot move. 3) Qualification judgment: If the upper end surface of the measuring section is located between the left end surface and the right end surface of the upper end of the positioning sleeve, the part is qualified; if the upper end surface of the measuring section is flush with the left end surface of the upper end of the positioning sleeve, the part is qualified, and the distance from the center of the concave spherical surface of the part to the end surface of the inner hole is the maximum value; if the upper end surface of the measuring section is flush with the right end surface of the upper end of the positioning sleeve, the part is qualified, and the distance from the center of the concave spherical surface of the part to the end surface of the inner hole is the minimum value; If the upper end surface of the measuring section is higher than the left end surface of the upper end of the positioning sleeve or lower than the right end surface of the upper end of the positioning sleeve, the part is unqualified.

[0014] When the upper end surface of the measuring section is lower than the right end surface of the upper end of the locating sleeve, use a dial indicator or a knife-edge ruler to measure the distance from the upper end surface of the measuring section to the right end surface of the upper end of the locating sleeve, and then move the part to the machine tool for processing until the measurement is qualified.

[0015] If the actual value of the distance from the inner concave spherical surface of the part to the end face of the inner hole is needed during the measurement process, a dial indicator or a knife-edge ruler can be used to measure the distance from the upper end face of the measuring section to the left end face of the upper end of the locating sleeve.

[0016] The gauge can also apply red lead or blue alum on the spherical shaft surface of the measuring shaft after the limit screw is withdrawn, and the distance from the center of the concave spherical surface of the part to the end face of the inner hole can be measured by the coloring measurement method to see if it is qualified.

[0017] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modification made to the present invention by those skilled in the art without departing from the spirit of the present invention shall fall within the protection scope of the present invention.

Claims

1. A gauge for measuring the distance from the center of a concave spherical surface of a part to the end face of an inner hole, characterized in that: The invention comprises a measuring shaft (1) and a positioning sleeve (2), wherein the measuring shaft (1) is a stepped shaft, the lower end of the measuring shaft (1) is a spherical shaft (1-1), the diameter of the spherical shaft (1-1) is the same as the diameter of the inner concave spherical surface of the part (4), the middle section of the measuring shaft (1) is a measuring section (1-2) having the same diameter as the spherical shaft (1-1), the upper small diameter section of the measuring shaft (1) is a handheld part (1-3), the positioning sleeve (2) is a stepped cylindrical shape, a through hole (2-1) is arranged in the central axis of the positioning sleeve (2) so that the large diameter section of the measuring shaft (1) can pass through, the small diameter section of the positioning sleeve (2) is a positioning section (2-2) in contact with the inner hole end face (F) of the part (4), the large diameter section of the positioning sleeve (2) is a limiting section (2-3), the spherical shaft (1-1) of the measuring shaft (1) passes through the through hole (2-1) of the positioning sleeve (2), and the measuring shaft (1) is a measuring section (1-2) which is a measuring section (1-3) of the measuring shaft (1). 1) is clearance-matched with the positioning sleeve (2); the distance (L1) from the center of the spherical axis (1-1) of the measuring axis (1) to the lower end surface of the positioning sleeve (2) is the distance (L) from the center of the concave spherical surface of the part (4) to the end surface (F) of the inner hole; the upper end of the positioning sleeve (2) is divided into a left end surface (B) and a right end surface (C) parallel to each other; the distance (L2) from the upper end surface of the left end surface (B) to the upper end surface of the right end surface (C) is the difference between the maximum and minimum values ​​of the distance (L) from the center of the concave spherical surface (4-2) of the part (4) to the end surface (F) of the inner hole (4-1); the distance (L3) from the center of the spherical axis (1-1) of the measuring axis (1) to the upper end surface (D) of the measuring section (1-2) is the distance (L4) from the lower end surface (A) of the positioning sleeve (2) to the upper right end surface (C) of the positioning sleeve (2).

2. The gauge according to claim 1, characterized in that: An axially extending limiting groove (1-4) is provided on the outer circumference of the upper end of the measuring section (1-2) of the measuring shaft (1); a threaded hole (2-4) extending axially along the limiting section (2-3) and penetrating the wall of the cylinder is provided on the cylinder wall of the limiting section (2-3) of the positioning sleeve (2); the threaded hole (2-4) corresponds to the limiting groove (1-4) on the measuring shaft (1); and the limiting screw (3) is installed in the limiting groove (1-4) after passing through the threaded hole (2-4).

3. The gauge according to claim 2, characterized in that: The axial length of the limiting groove (1-4) is 2 to 3 mm greater than the diameter of the limiting screw (3).

4. The gauge according to claim 1, characterized in that: The distance from the lower end surface of the positioning sleeve (2) to the left end surface (B) of the upper end of the positioning sleeve (2) is greater than the depth of the inner hole (4-1) of the part (4) by 24 to 26 mm, the depth of the positioning section (2-2) of the positioning sleeve (2) is greater than the depth of the inner hole (4) of the part (4) by 2 to 5 mm, and the outer diameter of the positioning section (2-2) of the positioning sleeve (2) is smaller than the diameter of the inner hole (4-1) of the part (4) by 1 to 2 mm.

5. The gauge according to claim 1, characterized in that: The outer surface of the handheld portion (1-3) of the measuring shaft (1) is provided with textures for increasing friction.

6. A measuring method based on the gauge according to any one of claims 1 to 5, characterized in that: The following steps are involved: 1) Place the lower end of the locating sleeve that has been installed in the measuring shaft into the inner hole of the part, so that the lower end surface of the locating sleeve is in full contact with the inner hole of the part; 2) Move the measuring axis downwards so that the spherical section of the measuring axis fully contacts the concave spherical surface of the part until the measuring axis cannot move. 3) Qualification judgment: If the upper end surface of the measuring section is located between the left end surface and the right end surface of the upper end of the positioning sleeve, the part is qualified; if the upper end surface of the measuring section is flush with the left end surface of the upper end of the positioning sleeve, the part is qualified, and the distance from the center of the concave spherical surface of the part to the end surface of the inner hole is the maximum value; if the upper end surface of the measuring section is flush with the right end surface of the upper end of the positioning sleeve, the part is qualified, and the distance from the center of the concave spherical surface of the part to the end surface of the inner hole is the minimum value; If the upper end surface of the measuring section is higher than the left end surface of the upper end of the positioning sleeve or lower than the right end surface of the upper end of the positioning sleeve, the part is unqualified.

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