Device for measuring pitch of transmission rack of numerical control machine tool

Abstract

The numerical control machine tool transmission rack pitch measuring device comprises a fixing block, a first reamed hole and a second reamed hole are arranged on the surface of the fixing block along the length direction of the fixing block, a first inspection rod is installed in the first reamed hole, a fixing plate is vertically fixed on the surface of the fixing block close to the end portion of the second reamed hole, and an installation hole is arranged on the surface of the fixing plate. A dial indicator is fixed in the second reamed hole, a measuring rod of the dial indicator penetrates through the mounting hole, a connecting groove communicated with the mounting hole is formed in one side of the fixing plate, and the connecting groove is perpendicular to the fixing plate and penetrates through the surface of the fixing plate; according to the utility model, the tooth pitch of two racks can be conveniently measured, the reading is accurate, the error is small, the tooth pitch precision when the two racks are installed can be ensured, and the first threaded hole on the fixed plate generates downward elastic deformation by fastening the locking screw, so that the pre-tightening of the measuring rod of the dial indicator is realized, and the rotation of the measuring rod is prevented. Through twice measurement of the dial indicator, the tooth pitch precision during installation of the two racks can be ensured.

Description

Technical Field

[0001] This utility model belongs to the technical field of tooth pitch detection equipment, and relates to a tooth pitch measuring device for CNC machine tool transmission rack. Background Technology

[0002] Currently, various CNC milling and boring machines are widely used in the metal processing industry to achieve rough, semi-finish, and finish machining of complex high-precision parts made of casting, forging, welding, etc. These machine tools have functions such as milling, boring, drilling, reaming, tapping, expanding, and countersinking. Equipped with various accessory milling heads and rotary tables, they enable multi-faceted machining of workpieces with a single clamping, offering advantages such as saving on process equipment, shortening production preparation cycles, improving work efficiency, and reducing production costs, resulting in good economic benefits. However, while CNC machine tools offer many advantages, the installation of transmission racks requires high precision due to the assembly of multiple identical racks. If the pitch precision of adjacent racks exceeds the tolerance, it can lead to instability and vibration in the CNC machine tool's transmission, even exceeding the machine tool's transmission precision requirements. This can result in dimensional and geometrical errors in the machined parts during metal cutting, potentially leading to parts scrap and affecting the machine tool's lifespan.

[0003] Traditional methods for measuring the distance between two racks typically involve placing two test bars between the two racks and reading the distance between them using vernier calipers. This purely manual measurement method suffers from poor accuracy and stability, is inconvenient for checking accumulated pitch deviations, and makes it difficult to fix the workpiece during the measurement process. Traditional methods for measuring the pitch of adjacent racks have drawbacks such as large errors and difficulty in guaranteeing accuracy. Therefore, ensuring the pitch accuracy of two racks during installation is a critical technical problem that urgently needs to be solved. Utility Model Content

[0004] The purpose of this invention is to provide a tooth pitch measuring device for CNC machine tool transmission racks, which solves the problem of large measurement error between adjacent racks when installing racks in CNC machine tools in the prior art.

[0005] The technical solution adopted by this utility model is a CNC machine tool transmission rack pitch measuring device, including a fixed block. A first reaming hole and a second reaming hole are opened on the surface of the fixed block along its length. A first inspection bar is installed in the first reaming hole. A fixed plate is vertically fixed to the end of the fixed block surface near the second reaming hole. A mounting hole is opened on the surface of the fixed plate. A dial indicator is fixed in the second reaming hole and the measuring rod of the dial indicator passes through the mounting hole. A connecting groove communicating with the mounting hole is opened on one side of the fixed plate. The connecting groove is perpendicular to the fixed plate and passes through the surface of the fixed plate.

[0006] The present invention also features a CNC machine tool transmission rack pitch measuring device, which is characterized by:

[0007] The fixed block has a second threaded hole at one end near the first hinge hole, which communicates with the first hinge hole, and a set screw is installed in the second threaded hole.

[0008] The top of the fixing plate has a first threaded hole that passes through the connecting groove, and a locking screw is installed in the first threaded hole.

[0009] The first reamed hole is connected to the first inspection bar via a transition fit.

[0010] The diameter of the second reamed hole is larger than that of the first reamed hole.

[0011] The fixing block is made of carbon steel or alloy steel with a hardness of HRC42-45.

[0012] The fixing plate is made of carbon steel or alloy steel with a hardness of HRC42-45.

[0013] The diameter of the first threaded hole is larger than the diameter of the mounting hole.

[0014] The beneficial effects of this utility model are:

[0015] This utility model of a CNC machine tool transmission rack pitch measuring device can conveniently measure the pitch of two racks, with accurate readings, small errors, simple structure, light weight, convenient operation and disassembly, and safety and reliability. By tightening the locking screw, the first threaded hole on the fixed plate can produce downward elastic deformation, thereby achieving pre-tightening of the dial indicator measuring rod and preventing its rotation. The two measurements by the dial indicator can ensure the pitch accuracy of the two racks during installation. When measuring racks with different modules, the first and second inspection bars of different sizes can be replaced according to actual needs. Attached Figure Description

[0016] Figure 1 This is a perspective view of the CNC machine tool transmission rack pitch measuring device of this utility model;

[0017] Figure 2 This is a top view of the CNC machine tool transmission rack pitch measuring device of this utility model;

[0018] Figure 3 This is a front view of the CNC machine tool transmission rack pitch measuring device during operation.

[0019] Figure 4 This is a top view of the CNC machine tool transmission rack pitch measuring device during operation.

[0020] In the diagram, 1. Fixing block, 2. Fixing plate, 3. Set screw, 4. Locking screw, 5. First reamed hole, 6. First threaded hole, 7. Second threaded hole, 8. First inspection bar, 9. Second inspection bar, 10. First rack, 11. Second rack, 12. Dial indicator, 13. Connecting groove, 14. Second reamed hole, 15. Mounting hole. Detailed Implementation

[0021] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0022] CNC machine tool transmission rack pitch measuring device, reference Figure 1 The device includes a fixing block 1. The surface of the fixing block 1 has a first hinge hole 5 and a second hinge hole 14 along its length. A first inspection rod 8 is installed in the first hinge hole 5. A fixing plate 2 is vertically fixed to the end of the surface of the fixing block 1 near the second hinge hole 14. The surface of the fixing plate 2 has a mounting hole 15. A dial indicator 12 is fixed in the second hinge hole 14 and the measuring rod of the dial indicator 12 passes through the mounting hole 15. A connecting groove 13 communicating with the mounting hole 15 is opened on one side of the fixing plate 2. The connecting groove 13 is perpendicular to the fixing plate 2 and passes through the surface of the fixing plate 2.

[0023] The fixing block 1 has a second threaded hole 7 at one end near the first reamed hole 5, which communicates with the first reamed hole 5. A set screw 3 is installed in the second threaded hole 7. (Refer to...) Figure 2 The top of the fixing plate 2 has a first threaded hole 6 that passes through the connecting groove 13. A locking screw 4 is installed in the first threaded hole 6. The first reamed hole 5 is connected to the first inspection bar 8 through a transition fit, which can achieve precise positioning and facilitate disassembly and installation. The diameter of the second reamed hole 14 is larger than the diameter of the first reamed hole 5.

[0024] To prevent elastic or plastic deformation of the fixing block 1 and the fixing plate 2, the fixing block 1 is made of carbon steel or alloy steel, and the fixing plate 2 is made of carbon steel or alloy steel. The fixing block 1 and the fixing plate 2 are subjected to quenching heat treatment to achieve a Rockwell hardness of HRC42-45, thereby improving their rigidity and ensuring the accuracy of the measurement results. The diameter of the first threaded hole 6 is larger than that of the mounting hole 15, so that when the locking screw 4 is tightened, sufficient force can be transmitted to the first threaded hole 6, causing it to undergo downward elastic deformation, thereby achieving pre-tightening of the dial indicator 12 measuring rod.

[0025] When measuring racks with different modules, the first inspection bar 8 and the second inspection bar 9 of different sizes can be replaced according to actual needs, making disassembly and assembly very convenient.

[0026] The working process of this utility model:

[0027] Reference Figure 3 and Figure 4Take the first rack 10 and the second rack 11 and place them horizontally aligned. Attach the first inspection bar 8 of the CNC machine tool transmission rack pitch measuring device to one tooth groove of the first rack 10. Take the second inspection bar 9 and attach it to the other tooth groove of the first rack 10 on the side where the fixing plate 2 is located. The first inspection bar 8 and the second inspection bar 9 are separated by three or four tooth grooves. Tighten the locking screw 4 so that the measuring head of the dial indicator 12 touches the body of the second inspection bar 9. At the same time, rotate the dial indicator 12 so that its pointer points to the scale "0". Then tighten the set screw 3. Record the reading of the dial indicator 12 at this time as the preload value.

[0028] Remove the first test bar 8 and the second test bar 9 from their respective slots. Attach the first test bar 8 to a slot on the first rack 10 near the second rack 11. Attach the second test bar 9 to a slot on the second rack 11, three or four slots away from the first test bar 8. Move the second rack 11 horizontally while rotating the dial indicator 12 until its pointer points to the scale "0". Stop moving the second rack 11 when the reading on the dial indicator 12 is the preload value. This is the installation position of the second rack 11.

[0029] Example 1:

[0030] A CNC machine tool transmission rack pitch measuring device includes a fixed block 1. The surface of the fixed block 1 has a first reaming hole 5 and a second reaming hole 14 along its length. A first inspection bar 8 is installed in the first reaming hole 5. A fixed plate 2 is vertically fixed to the end of the fixed block 1 near the second reaming hole 14. The surface of the fixed plate 2 has a mounting hole 15. A dial indicator 12 is fixed in the second reaming hole 14, and the measuring rod of the dial indicator 12 passes through the mounting hole 15. A connecting groove 13 communicating with the mounting hole 15 is opened on one side of the fixed plate 2. The connecting groove 13 is perpendicular to the fixed plate 2 and passes through the surface of the fixed plate 2.

[0031] The top of the fixing plate 2 has a first threaded hole 6 that passes through the connecting groove 13, and a locking screw 4 is installed in the first threaded hole 6.

[0032] The first reamed hole 5 is connected to the first inspection bar 8 via a transition fit.

[0033] The diameter of the second reamed hole 14 is larger than that of the first reamed hole 5.

[0034] The fixing block 1 is made of carbon steel with a hardness of HRC42.

[0035] The fixing plate 2 is made of carbon steel with a hardness of HRC42.

[0036] Example 2:

[0037] A CNC machine tool transmission rack pitch measuring device includes a fixed block 1. The surface of the fixed block 1 has a first reaming hole 5 and a second reaming hole 14 along its length. A first inspection bar 8 is installed in the first reaming hole 5. A fixed plate 2 is vertically fixed to the end of the fixed block 1 near the second reaming hole 14. The surface of the fixed plate 2 has a mounting hole 15. A dial indicator 12 is fixed in the second reaming hole 14, and the measuring rod of the dial indicator 12 passes through the mounting hole 15. A connecting groove 13 communicating with the mounting hole 15 is opened on one side of the fixed plate 2. The connecting groove 13 is perpendicular to the fixed plate 2 and passes through the surface of the fixed plate 2.

[0038] The fixing block 1 has a second threaded hole 7 that communicates with the first hinge hole 5 at one end, and a set screw 3 is installed in the second threaded hole 7.

[0039] The top of the fixing plate 2 has a first threaded hole 6 that passes through the connecting groove 13, and a locking screw 4 is installed in the first threaded hole 6.

[0040] The fixing block 1 is made of alloy steel with a hardness of HRC45.

[0041] The fixing plate 2 is made of alloy steel with a hardness of HRC45.

[0042] The diameter of the first threaded hole 6 is larger than the diameter of the mounting hole 15.

[0043] Example 3:

[0044] A CNC machine tool transmission rack pitch measuring device includes a fixed block 1. The surface of the fixed block 1 has a first reaming hole 5 and a second reaming hole 14 along its length. A first inspection bar 8 is installed in the first reaming hole 5. A fixed plate 2 is vertically fixed to the end of the fixed block 1 near the second reaming hole 14. The surface of the fixed plate 2 has a mounting hole 15. A dial indicator 12 is fixed in the second reaming hole 14, and the measuring rod of the dial indicator 12 passes through the mounting hole 15. A connecting groove 13 communicating with the mounting hole 15 is opened on one side of the fixed plate 2. The connecting groove 13 is perpendicular to the fixed plate 2 and passes through the surface of the fixed plate 2.

[0045] The top of the fixing plate 2 has a first threaded hole 6 that passes through the connecting groove 13, and a locking screw 4 is installed in the first threaded hole 6.

[0046] The first reamed hole 5 is connected to the first inspection bar 8 via a transition fit.

[0047] The diameter of the second reamed hole 14 is larger than that of the first reamed hole 5.

[0048] The fixing block 1 is made of carbon steel with a hardness of HRC44.

[0049] The fixing plate 2 is made of alloy steel with a hardness of HRC44.

[0050] The diameter of the first threaded hole 6 is larger than the diameter of the mounting hole 15.

[0051] Example 4:

[0052] A CNC machine tool transmission rack pitch measuring device includes a fixed block 1. The surface of the fixed block 1 has a first reaming hole 5 and a second reaming hole 14 along its length. A first inspection bar 8 is installed in the first reaming hole 5. A fixed plate 2 is vertically fixed to the end of the fixed block 1 near the second reaming hole 14. The surface of the fixed plate 2 has a mounting hole 15. A dial indicator 12 is fixed in the second reaming hole 14, and the measuring rod of the dial indicator 12 passes through the mounting hole 15. A connecting groove 13 communicating with the mounting hole 15 is opened on one side of the fixed plate 2. The connecting groove 13 is perpendicular to the fixed plate 2 and passes through the surface of the fixed plate 2.

[0053] The fixing block 1 has a second threaded hole 7 that communicates with the first hinge hole 5 at one end, and a set screw 3 is installed in the second threaded hole 7.

[0054] The top of the fixing plate 2 has a first threaded hole 6 that passes through the connecting groove 13, and a locking screw 4 is installed in the first threaded hole 6.

[0055] The diameter of the second reamed hole 14 is larger than that of the first reamed hole 5.

[0056] The fixing block 1 is made of alloy steel with a hardness of HRC43.

[0057] The fixing plate 2 is made of carbon steel with a hardness of HRC43.

[0058] The diameter of the first threaded hole 6 is larger than the diameter of the mounting hole 15.

[0059] Example 5:

[0060] A CNC machine tool transmission rack pitch measuring device includes a fixed block 1. The surface of the fixed block 1 has a first reaming hole 5 and a second reaming hole 14 along its length. A first inspection bar 8 is installed in the first reaming hole 5. A fixed plate 2 is vertically fixed to the end of the fixed block 1 near the second reaming hole 14. The surface of the fixed plate 2 has a mounting hole 15. A dial indicator 12 is fixed in the second reaming hole 14, and the measuring rod of the dial indicator 12 passes through the mounting hole 15. A connecting groove 13 communicating with the mounting hole 15 is opened on one side of the fixed plate 2. The connecting groove 13 is perpendicular to the fixed plate 2 and passes through the surface of the fixed plate 2.

[0061] The fixing block 1 has a second threaded hole 7 that communicates with the first hinge hole 5 at one end, and a set screw 3 is installed in the second threaded hole 7.

[0062] The top of the fixing plate 2 has a first threaded hole 6 that passes through the connecting groove 13, and a locking screw 4 is installed in the first threaded hole 6.

[0063] The first reamed hole 5 is connected to the first inspection bar 8 via a transition fit.

[0064] The diameter of the second reamed hole 14 is larger than that of the first reamed hole 5.

[0065] The diameter of the first threaded hole 6 is larger than the diameter of the mounting hole 15.

[0066] Example 6:

[0067] A CNC machine tool transmission rack pitch measuring device includes a fixed block 1. The surface of the fixed block 1 has a first reaming hole 5 and a second reaming hole 14 along its length. A first inspection bar 8 is installed in the first reaming hole 5. A fixed plate 2 is vertically fixed to the end of the fixed block 1 near the second reaming hole 14. The surface of the fixed plate 2 has a mounting hole 15. A dial indicator 12 is fixed in the second reaming hole 14, and the measuring rod of the dial indicator 12 passes through the mounting hole 15. A connecting groove 13 communicating with the mounting hole 15 is opened on one side of the fixed plate 2. The connecting groove 13 is perpendicular to the fixed plate 2 and passes through the surface of the fixed plate 2.

[0068] The fixing block 1 has a second threaded hole 7 that communicates with the first hinge hole 5 at one end, and a set screw 3 is installed in the second threaded hole 7.

[0069] The top of the fixing plate 2 has a first threaded hole 6 that passes through the connecting groove 13, and a locking screw 4 is installed in the first threaded hole 6.

[0070] The first reamed hole 5 is connected to the first inspection bar 8 via a transition fit.

[0071] The fixing block 1 is made of carbon steel with a hardness of HRC42.

[0072] Example 7:

[0073] A CNC machine tool transmission rack pitch measuring device includes a fixed block 1. The surface of the fixed block 1 has a first reaming hole 5 and a second reaming hole 14 along its length. A first inspection bar 8 is installed in the first reaming hole 5. A fixed plate 2 is vertically fixed to the end of the fixed block 1 near the second reaming hole 14. The surface of the fixed plate 2 has a mounting hole 15. A dial indicator 12 is fixed in the second reaming hole 14, and the measuring rod of the dial indicator 12 passes through the mounting hole 15. A connecting groove 13 communicating with the mounting hole 15 is opened on one side of the fixed plate 2. The connecting groove 13 is perpendicular to the fixed plate 2 and passes through the surface of the fixed plate 2.

[0074] The fixing block 1 has a second threaded hole 7 that communicates with the first hinge hole 5 at one end, and a set screw 3 is installed in the second threaded hole 7.

[0075] The top of the fixing plate 2 has a first threaded hole 6 that passes through the connecting groove 13, and a locking screw 4 is installed in the first threaded hole 6.

[0076] The first reamed hole 5 is connected to the first inspection bar 8 via a transition fit.

[0077] The diameter of the second reamed hole 14 is larger than that of the first reamed hole 5.

[0078] The fixing plate 2 is made of carbon steel with a hardness of HRC45.

[0079] The diameter of the first threaded hole 6 is larger than the diameter of the mounting hole 15.

Claims

1. A device for measuring the pitch of a rack and pinion in a CNC machine tool transmission, characterized in that, The device includes a fixing block (1), on which a first hinge hole (5) and a second hinge hole (14) are provided along its length. A first inspection rod (8) is installed in the first hinge hole (5). A fixing plate (2) is vertically fixed to the end of the fixing block (1) near the second hinge hole (14). A mounting hole (15) is provided on the surface of the fixing plate (2). A dial indicator (12) is fixed in the second hinge hole (14) and the measuring rod of the dial indicator (12) passes through the mounting hole (15). A connecting groove (13) communicating with the mounting hole (15) is provided on one side of the fixing plate (2). The connecting groove (13) is perpendicular to the fixing plate (2) and passes through the surface of the fixing plate (2).

2. The CNC machine tool transmission rack pitch measuring device according to claim 1, characterized in that, The fixing block (1) has a second threaded hole (7) that communicates with the first hinge hole (5) at one end, and a set screw (3) is installed in the second threaded hole (7).

3. The CNC machine tool transmission rack pitch measuring device according to claim 1, characterized in that, The top of the fixing plate (2) has a first threaded hole (6) that passes through the connecting groove (13), and a locking screw (4) is installed in the first threaded hole (6).

4. The CNC machine tool transmission rack pitch measuring device according to any one of claims 1-3, characterized in that, The first reamed hole (5) is connected to the first inspection bar (8) through a transition fit.

5. The CNC machine tool transmission rack pitch measuring device according to any one of claims 1-3, characterized in that, The diameter of the second reamed hole (14) is larger than the diameter of the first reamed hole (5).

6. The CNC machine tool transmission rack pitch measuring device according to any one of claims 1-3, characterized in that, The fixing block (1) is made of carbon steel or alloy steel with a hardness of HRC42-45.

7. The CNC machine tool transmission rack pitch measuring device according to any one of claims 1-3, characterized in that, The fixing plate (2) is made of carbon steel or alloy steel with a hardness of HRC42-45.

8. The CNC machine tool transmission rack pitch measuring device according to claim 3, characterized in that, The diameter of the first threaded hole (6) is larger than the diameter of the mounting hole (15).

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