An instrument for measuring the perpendicularity of the threads of a threaded part to the end face

Abstract

The application discloses a device for measuring the perpendicularity between the thread of a threaded part and an end face, comprising: a device capable of horizontally moving a measuring body with the threaded part, and adjusting different radial size positions required by the measuring end face. The measuring body is horizontally moved on a guide rail through a sliding block to adjust different radial size positions required by the measuring, and is rotated with the measuring body through a three-jaw chuck, so that the whole circumferential path of the same radial size position is measured, and the problem that the data reliability of the measurement of the perpendicularity between the thread and the end face is insufficient due to the fact that a percent table can only measure the end face position of the same radial size is solved.

Description

Technical Field

[0001] This invention relates to an instrument for measuring the perpendicularity of the thread to the end face of a threaded part, belonging to the field of threaded part measurement technology. Background Technology

[0002] Due to the high precision requirements of assembly, threaded parts such as bolts and nuts used in aviation have increasingly stringent requirements for the perpendicularity of the threads to the end face, with the minimum dimensional requirement reaching 0.03 mm. Although a coordinate measuring machine (CMM) can be used to measure perpendicularity, these machines are expensive (see Table 1 for a price list). Therefore, an instrument for measuring the perpendicularity of threads to the end face needs to be designed.

[0003] Existing instrument technology for measuring the perpendicularity of threads to end faces is available in Chinese Patent Announcement CN203298705U. Although the dial indicator is fixed to the locating pin by the mounting base, enabling the dial indicator to perform measurements, the dial indicator can only measure the end face position of the same radial dimension, resulting in insufficient reliability of the data for measuring the perpendicularity of threads to end faces. Summary of the Invention

[0004] To solve the above-mentioned technical problems, the present invention provides an instrument for measuring the perpendicularity of the thread to the end face of a threaded part.

[0005] The present invention is achieved through the following technical solutions.

[0006] This invention provides an instrument for measuring the perpendicularity of the thread to the end face of a threaded part, comprising: An instrument that can move the measuring body of a threaded part horizontally and adjust the measuring end face to different radial dimensions as required.

[0007] The instrument includes a measuring platform, a guide rail fixed on the measuring platform, a slider slidably mounted on the guide rail, and a three-jaw chuck rotatably mounted on the slider. A dial indicator frame is fixedly installed on the top surface of the measuring platform, and a dial indicator with its probe facing downwards and in contact with the end face of the measuring body is installed on the dial indicator frame.

[0008] The guide rail base consists of two fixedly spaced rails distributed on the top surface of the measuring platform.

[0009] The guide rail consists of two rails, with each end of the rail fixedly connected to a spaced guide rail seat.

[0010] A three-jaw chuck is rotatably mounted on the slider via a bearing or shaft hole; the three-jaw chuck has three jaws for clamping and holding the fixture.

[0011] The dial indicator frame includes two columns fixed to the top surface of the measuring platform. The columns are spaced apart, and a dial indicator slider is slidably installed on the column. The dial indicator slider is adjusted and tightened on the column by screws. The dial indicator is fixed to the dial indicator slider by a cantilever support column.

[0012] When the measuring body is a bolt with external threads, the clamping fixture is a clamping fixture A with an internal thread through hole. The clamping fixture A has a clamping position A for clamping. The external thread of the bolt engages with the internal thread through hole of the clamping fixture A. The clamping fixture A is placed on a three-jaw chuck, and the clamping position A is clamped and secured by three jaws. The probe of the dial indicator contacts the lower support surface of the bolt to perform measurement. The three-jaw chuck rotates to obtain the perpendicularity measurement of one radial dimension end face of the lower support surface. The three-jaw chuck slides and adjusts with the slider on the guide rail, changing different radial dimension positions of the lower support surface. Then the three-jaw chuck rotates, and the changes in the dial indicator reading are observed and recorded. Perpendicularity data of multiple different radial dimension positions of the external thread and the lower support surface can be obtained.

[0013] When the measuring body is a threaded sleeve with internal threads, the clamping fixture is a clamping fixture B with an external thread section. The clamping fixture B has a clamping section B for clamping. The internal thread of the sleeve is screwed into and fixed with the external thread section of the clamping fixture B. The clamping fixture B is placed on a three-jaw chuck, and the clamping section B is clamped and secured by three jaws. The probe of the dial indicator contacts the axial end face of the sleeve for measurement. The three-jaw chuck rotates to obtain the perpendicularity measurement of one radial dimension end face of the axial end face. The three-jaw chuck slides and adjusts with the slider on the guide rail, changing the position of different radial dimensions of the axial end face. Then the three-jaw chuck rotates, and the change of the dial indicator reading is observed and recorded. Perpendicularity data of multiple different radial dimension positions of the axial end face and the internal thread of the sleeve can be obtained.

[0014] The beneficial effects of this invention are as follows: the measuring body moves horizontally on the guide rail via a slider to adjust to different radial dimension positions required for measurement, and the measuring body is rotated by a three-jaw chuck to realize the measurement of the entire circumferential path at the same radial dimension position. This solves the problem that dial indicators can only measure the end face position of the same radial dimension, resulting in insufficient data reliability for measuring the perpendicularity of the thread to the end face. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a front view schematic diagram of the present invention; Figure 3 This is a front view schematic diagram when the measuring body of the present invention is a bolt with external threads; Figure 4 This is a front view schematic diagram of the measuring body of the present invention when it is a threaded sleeve with internal threads; Figure 5 This is a front view schematic diagram of the clamping fixture of the present invention when it is clamping fixture part A; Figure 6 This is a front view schematic diagram of the clamping fixture of the present invention when it is clamping fixture part B; In the diagram: 1-Measuring platform; 11-Guide rail base; 2-Guide rail; 3-Slider; 4-Three-jaw chuck; 41-Chuck jaw; 5-Dial indicator; 51- Probe; 6-Dial indicator frame; 61-Frame column; 62-Frame slider; 63-Screw; 64-Cantilever support column; 71-Clamping fixture A; 72-Clamping position A; 75-Internal threaded through hole; 81-Bolt; 82-External thread; 83-Head support surface; 73-Clamping fixture B; 74-Clamping section B; 76-External thread section; 91-Threaded sleeve; 92-Internal thread; 93-Axial end face. Detailed Implementation

[0016] The technical solution of the present invention is further described below, but the scope of protection is not limited to what is described.

[0017] like Figures 1 to 6 As shown.

[0018] This application discloses an instrument for measuring the perpendicularity of the thread to the end face of a threaded part, comprising: The measuring platform 1 is placed in a fixed, static, horizontal position during measurement. Guide rail seats 11 are fixed on the top surface of the measuring platform 1, and there are two guide rail seats 11 distributed at intervals.

[0019] It also includes two guide rails 2, with each end of the guide rail 2 fixedly connected to two spaced guide rail seats 11. A slider 3 is slidably mounted on the guide rail 2, and the slider 3 has a sliding through hole for slidable engagement with the guide rail 2. A three-jaw chuck 4 is rotatably mounted on the slider 3 via a bearing or shaft hole. The three-jaw chuck 4 has jaws 41 (this is prior art), and the three jaws 41 move radially together synchronously to clamp the fixture securely.

[0020] A dial indicator frame 6 is fixedly installed on the top surface of the measuring platform 1. The dial indicator frame 6 includes two spaced-apart support columns 61 fixed to the top surface of the measuring platform 1. A slider 62 is slidably mounted on the support column 61. The slider 62 has a threaded through hole, and a screw 63 is screwed into the threaded through hole. The slider 62 is adjusted and tightened onto the support column 61 by the screw 63. The slider 62 has a mounting through hole, and a cantilever support column 64 is installed through the mounting through hole. The cantilever support column 64 is fixedly connected to the dial indicator 5 housing by welding or bonding, with the probe 51 of the dial indicator 5 facing downwards. The dial indicator 5 is mounted on the dial indicator frame 6, preventing the dial indicator frame 6 from moving horizontally and ensuring the position of the dial indicator 5. The measuring body is adjusted to different radial dimension positions by the horizontal movement of the slider 3 on the guide rail 2. The measuring body is rotated by the three-jaw chuck 4 to achieve measurement of the entire circumferential path of the same radial dimension position. This solves the problem that dial indicators can only measure the end face position of the same radial dimension, resulting in insufficient reliability of the data for measuring the perpendicularity of the thread to the end face.

[0021] It also includes clamping fixtures for mounting the measuring body.

[0022] When the measuring body is a bolt 81 with external threads, such as Figure 3 As shown, the clamping fixture is a clamping fixture A71 with an internal threaded through hole 75, and the clamping fixture A71 has a clamping position A72 for clamping, as shown. Figure 5 As shown, the external thread 82 of the bolt 81 engages with the internal thread through hole 75 of the clamping fixture A71. The clamping fixture A71 is placed on the three-jaw chuck 4, and the clamping position A72 is clamped and secured by the three jaws 41. The probe 51 of the dial indicator 5 contacts the lower support surface 83 of the bolt 81 to perform measurement. The three-jaw chuck 4 rotates to obtain the perpendicularity measurement of one radial dimension end face of the lower support surface 83. The three-jaw chuck 4 slides and adjusts on the guide rail 2 along with the slider 3, changing the different radial dimension positions of the lower support surface 83. Then the three-jaw chuck 4 rotates, and the changes in the dial indicator 5 reading are observed and recorded. Perpendicularity data of the external thread 82 and the lower support surface 83 at multiple different radial dimension positions can be obtained. By changing different clamping fixtures, this method can be applied to rod-like components.

[0023] When the measuring body is a threaded sleeve 91 with internal threads, such as Figure 4 As shown, the clamping fixture is a clamping fixture B73 with an external thread section, and the clamping fixture B73 has a clamping section B74 for clamping, as shown. Figure 6As shown, the internal thread 92 of the threaded sleeve 91 is screwed and fixed to the external thread section 76 of the clamping fixture B73. The clamping fixture B73 is placed on the three-jaw chuck 4, and the clamping section B74 is clamped and secured by three jaws 41. The probe 51 of the dial indicator 5 contacts the axial end face 93 of the threaded sleeve 91 for measurement. The three-jaw chuck 4 rotates to obtain the perpendicularity measurement of one radial dimension end face of the axial end face 93. The three-jaw chuck 4 slides and adjusts on the guide rail 2 along with the slider 3, changing the different radial dimension positions of the axial end face 93. Then the three-jaw chuck 4 rotates, and the changes in the dial indicator 5 reading are observed and recorded. Perpendicularity data of the axial end face 93 and the internal thread of the threaded sleeve 91 at multiple different radial dimension positions can be obtained. By changing different clamping fixtures, this method can be applied to internal hole components.

[0024] Compared with coordinate measuring machines, the technical solution of this application has advantages in cost and operation time, as shown in Table 1.

[0025] Table 1. Comparison of measurement process time and price between the instrument and the coordinate measuring machine in this application.

[0026] As shown in Table 1, the measurement process time of the instrument in this application is 6 minutes and 30 seconds less than that of the coordinate measuring machine; the equipment cost of the instrument in this application is at least 7,000 yuan less than that of the coordinate measuring machine.

Claims

1. An instrument for measuring the perpendicularity of the thread to the end face of a threaded part, characterized in that, include: An instrument that can move the measuring body of a threaded part horizontally and adjust the measuring end face to different radial dimensions as required.

2. The instrument for measuring the perpendicularity of the thread to the end face of a threaded part as described in claim 1, characterized in that: The instrument includes a measuring platform (1), a guide rail (2) fixed on the measuring platform (1), a slider (3) slidably mounted on the guide rail (2), and a three-jaw chuck (4) rotatably mounted on the slider (3). The measuring platform (1) is fixedly installed with a dial indicator frame (6) on its top surface. The dial indicator frame (6) is equipped with a dial indicator (5) with the probe (51) facing downwards and contacting the end face of the measuring body. When the measuring body is a threaded sleeve (91) with internal threads, the clamping fixture is a clamping fixture B (73) with an external thread section. The clamping fixture B (73) has a clamping section B (74) for clamping. The internal thread (92) of the threaded sleeve (91) is screwed and fixed with the external thread section (76) of the clamping fixture B (73). The clamping fixture B (73) is placed on a three-jaw chuck (4), and the clamping section B (74) is clamped and secured by three jaws (41). The probe (51) of the dial indicator (5) is connected to... The axial end face (93) of the threaded sleeve (91) is measured. The three-jaw chuck (4) is rotated to obtain the perpendicularity measurement of one radial dimension end face of the axial end face (93). The three-jaw chuck (4) slides and adjusts on the guide rail (2) with the slider (3) to change the position of different radial dimensions of the axial end face (93). Then the three-jaw chuck (4) is rotated, and the change of the dial indicator (5) reading is observed and recorded. Perpendicularity data of multiple different radial dimension positions of the axial end face (93) and the threaded sleeve (91) can be obtained.

3. The instrument for measuring the perpendicularity of the thread to the end face of a threaded part as described in claim 2, characterized in that: The guide rail base (11) consists of two fixedly spaced rails on the top surface of the measuring platform (1).

4. The instrument for measuring the perpendicularity of the thread to the end face of a threaded part as described in claim 2, characterized in that: The guide rail (2) consists of two rails, with each end of the guide rail (2) being fixedly connected to two spaced guide rail seats (11).

5. The instrument for measuring the perpendicularity of the thread to the end face of a threaded part as described in claim 2, characterized in that: The slider (3) is rotatably mounted with a three-jaw chuck (4) through a bearing or shaft hole; the three-jaw chuck (4) has three jaws (41) for fastening and clamping the clamping fixture.

6. The instrument for measuring the perpendicularity of the thread to the end face of a threaded part as described in claim 2, characterized in that: The dial indicator frame (6) includes a support column (61) fixed on the top surface of the measuring platform (1). There are two support columns (61) spaced apart. A slider (62) is slidably installed on the support column (61). The slider (62) is adjusted and tightened on the support column (61) by screws (63). The dial indicator (5) is fixed to the slider (62) by a cantilever support column (64).

7. The instrument for measuring the perpendicularity of the thread to the end face of a threaded part as described in claim 2, characterized in that: When the measuring body is a bolt (81) with external threads, the clamping fixture is a clamping fixture A (71) with an internal threaded through hole (75). The clamping fixture A (71) has a clamping position A (72) for clamping. The external thread (82) of the bolt (81) engages with the internal threaded through hole (75) of the clamping fixture A (71). The clamping fixture A (71) is placed on the three-jaw chuck (4), and the clamping position A (72) is clamped and secured by three jaws (41). The probe (51) of the dial indicator (5) The perpendicularity of the head support surface (83) of the contact bolt (81) is measured by rotating the three-jaw chuck (4) to obtain the perpendicularity measurement of the radial dimension end face of the head support surface (83). The three-jaw chuck (4) slides and adjusts on the guide rail (2) with the slider (3) to change the different radial dimension positions of the head support surface (83). Then the three-jaw chuck (4) rotates, and the changes in the dial indicator (5) reading are observed and recorded. Perpendicularity data of multiple different radial dimension positions of the external thread (82) and the head support surface (83) can be obtained.

Images