Machining center centering rod

Abstract

The utility model belongs to the technical field of machining measurement accessories, and particularly relates to a machining center centering rod which comprises a clamping rod, a first fixing disc and a second fixing disc. An auxiliary measuring rod is arranged at the bottom of the main measuring rod, a second fixing disc is arranged at the top of the main measuring rod, and the bottom face of the first fixing disc makes contact with the top face of the second fixing disc in an attached mode; the elastic connecting structure is arranged between the center of the clamping rod and the center of the main measuring rod and is used for connecting and assembling the clamping rod and the main measuring rod; the self-lubricating components are arranged on the first fixing disc and the second fixing disc through buckle structures and used for solving the problems that as the contact face of the end of the clamping rod and the end of the measuring rod of the mechanical centering rod is lubricated only through a small amount of lubricating grease, as the service time is prolonged, the grease is reduced and deteriorated and is contaminated with dust, friction and abrasion of the contact face are increased, and the service life of the mechanical centering rod is prolonged. And irreversible damage is caused to the use precision of the centering rod, so that the initial positioning precision of a machine tool to a machined part is influenced.

Description

Technical Field

[0001] This utility model belongs to the technical field of mechanical processing and measuring accessories, specifically relating to a centering bar for a machining center. Background Technology

[0002] A centering bar, also known as a centering device or edge finder, is a precision measuring tool used on CNC machine tools and manual milling machines. It is primarily used for quickly locating the reference position of a workpiece or cutting tool (such as the workpiece origin, center point, or edge), providing accurate coordinate references for subsequent machining. The centering bar indicates its position through physical contact trigger signals or mechanical offset. Based on its principle, it can be divided into two categories: mechanical centering bars (spring-biased type) and electronic centering bars (trigger type). The mechanical centering bar is mounted on the machine tool spindle and rotates at a low speed (usually 200-500 RPM). When the measuring rod contacts the workpiece, it is offset by an external force, the spring is compressed, and a small displacement occurs between the measuring rod and the centering bar body. The operator determines the contact point by observing the offset of the measuring rod.

[0003] Currently, mechanical centering bars on the market have direct contact between the clamping rod end and the measuring rod end. The contact surface is lubricated only by a small amount of lubricating grease. As the usage time increases, the grease decreases, deteriorates, and becomes contaminated with dust, leading to increased friction and wear on the contact surface. This causes irreversible damage to the centering bar's accuracy, thus directly affecting the machine tool's initial positioning accuracy for the machined parts. Utility Model Content

[0004] Based on the problems mentioned in the background technology above, this utility model provides a centering bar for machining centers to solve the problem that the contact surface between the clamping rod end and the measuring rod end of the mechanical centering bar relies on only a small amount of lubricating grease for lubrication. As the usage time increases, the grease decreases, deteriorates, and becomes contaminated with dust, leading to increased friction and wear on the contact surface. This causes irreversible damage to the accuracy of the centering bar and directly affects the initial positioning accuracy of the machine tool for machining parts.

[0005] The technical solution adopted in this utility model is as follows:

[0006] A centering bar for a machining center, comprising:

[0007] A clamping rod, wherein a fixing plate is provided at the bottom of the clamping rod;

[0008] The main measuring rod has a secondary measuring rod at its bottom and a second fixing plate at its top, with the bottom surface of the first fixing plate in contact with the top surface of the second fixing plate.

[0009] An elastic connection structure is provided between the center of the clamping rod and the center of the main measuring rod, and is used to connect and assemble the clamping rod and the main measuring rod.

[0010] The self-lubricating component is mounted on fixed plate one and fixed plate two via a snap-fit ​​structure.

[0011] Based on the above technical solution, the present invention has made the following improvements:

[0012] Furthermore, the elastic connection structure includes a through hole and a blind hole. The through hole is located at the center of the clamping rod, and the blind hole is inserted along the top surface of the second fixing plate and located at the center of the main measuring rod. A hook plate is provided at the top of the through hole, and a locking pin is provided on the bottom peripheral wall of the blind hole through a locking hole. A tension spring is provided between the hook plate and the locking pin.

[0013] Furthermore, the self-lubricating component includes a first gasket and a second gasket, both of which are made of high-hardness, high-wear-resistant ceramic material.

[0014] Furthermore, the high-hardness, high-wear-resistant ceramic is zirconium oxide.

[0015] Furthermore, the buckle structure includes a protruding ring and an annular groove. The bottom surface of the first fixed plate and the top surface of the second fixed plate are both provided with the protruding ring, and the top surface of the first gasket and the bottom surface of the second gasket are both provided with the annular groove. The annular groove on the first gasket is engaged with the protruding ring on the first fixed plate, and the annular groove on the second gasket is engaged with the protruding ring on the second fixed plate.

[0016] Furthermore, the bottom of the secondary measuring rod is provided with a mounting hole.

[0017] The beneficial effects of this utility model are:

[0018] By incorporating self-lubricating components, namely gasket one and gasket two made of high-hardness, high-wear-resistant ceramic material, gasket one and gasket two are isolated between the contact surfaces of the bottom surface of fixed disk one and the top surface of fixed disk two. This changes the original metal-to-ceramic contact to ceramic-to-ceramic contact, solving the problem of heat generation and wear caused by friction between metal surfaces. Furthermore, ceramic has excellent self-lubricating properties, high temperature resistance, and ultra-wear resistance, thereby extending the product's service life and ensuring the accuracy of measurements during processing. Attached Figure Description

[0019] This utility model can be further illustrated by the non-limiting embodiments given in the accompanying drawings;

[0020] Figure 1 This is a structural diagram of a centering bar for a machining center according to the present invention;

[0021] Figure 2 This is a cross-sectional view of a centering bar for a machining center according to the present invention.

[0022] The attached diagram is labeled as follows:

[0023] 101. Clamping rod; 102. Fixing plate one; 103. Through hole; 201. Main measuring rod; 202. Fixing plate two; 203. Secondary measuring rod; 204. Mounting hole; 205. Blind hole; 301. Hook plate; 302. Locking hole; 303. Locking pin; 304. Pull spring; 4. Washer one; 5. Washer two; 601. Raised ring; 602. Ring groove. Detailed Implementation

[0024] like Figures 1-2 As shown, a centering bar for a machining center includes:

[0025] A clamping rod 101 has a fixed plate 102 at its bottom, and is clamped on the machine tool spindle, allowing the spindle to drive the centering bar to rotate. A main measuring rod 201 has a secondary measuring rod 203 at its bottom and a fixed plate 202 at its top. The bottom surface of the first fixed plate 102 and the top surface of the second fixed plate 202 are in contact. The main measuring rod 201 contacts the outer surface of the workpiece, while the secondary measuring rod 203 contacts the inner wall of the workpiece hole. The secondary measuring rod 203 has a mounting hole 204 at its bottom, which can be used to install a spring or elastic pin, providing cushioning when the secondary measuring rod 203 moves downward to contact the upper surface of the workpiece, protecting the end of the secondary measuring rod 203 and the workpiece surface.

[0026] An elastic connection structure is provided between the center of the clamping rod 101 and the center of the main measuring rod 201. The elastic connection structure includes a through hole 103 and a blind hole 205. The through hole 103 is located at the center of the clamping rod 101, and the blind hole 205 is inserted along the top surface of the fixing plate 202 and located at the center of the main measuring rod 201. A hook plate 301 is provided at the top of the through hole 103, and a locking pin 303 is secured on the bottom peripheral wall of the blind hole 205 through a locking hole 302. A tension spring 304 is provided between the hook plate 301 and the locking pin 303. The combination of the hook plate 301, the locking pin 303, and the tension spring 304 utilizes the contractile property of the tension spring 304 to pull the clamping rod 101 and the main measuring rod 201 together, thereby connecting and assembling the clamping rod 101 and the main measuring rod 201 together.

[0027] As the centering bar rotates under the drive of the machine tool spindle, and the centering bar is adjusted and moved simultaneously, when the peripheral wall of the main measuring rod 201 does not contact the workpiece surface, the main measuring rod 201 will slightly swing below the bottom of the clamping rod 101, causing friction at the contact point between the bottom surface of the first fixed plate 102 and the top surface of the second fixed plate 202. When the peripheral wall of the main measuring rod 201 moves to contact the workpiece surface, the main measuring rod 201 will not swing under the action of abutting against the workpiece surface, ensuring that the clamping rod 101 and the main measuring rod 201 remain on the same axis, indicating that the tool setting contact point is in place. When the peripheral wall of the main measuring rod 201 is continuously pressed by the workpiece, displacement will occur between the main measuring rod 201 and the clamping rod 101, resulting in a misalignment between the main measuring rod 201 and the clamping rod 101, indicating that the tool setting contact point is out of place. Therefore, the operator can judge whether the tool setting contact point is in place by observing the offset of the main measuring rod 201.

[0028] The self-lubricating component is mounted on fixed disk 102 and fixed disk 202 via a snap-fit ​​structure. The self-lubricating component includes gasket 14 and gasket 25, both made of high-hardness, high-wear-resistant ceramic material, specifically zirconium oxide. The snap-fit ​​structure includes a protruding ring 601 and an annular groove 602. The bottom surface of fixed disk 102 and the top surface of fixed disk 202 are both provided with protruding rings 601, and the top surface of gasket 14 and the bottom surface of gasket 25 are provided with annular grooves 601. 2. The annular groove 602 on gasket 4 is engaged with the protruding ring 601 on the fixed disk 102, and the annular groove 602 on gasket 5 is engaged with the protruding ring 601 on the fixed disk 202. By using the combination of the protruding ring 601 and the annular groove 602, gasket 4 is assembled on the bottom surface of fixed disk 102, and gasket 5 is assembled on the top surface of fixed disk 202, so that gasket 4 and gasket 5 are isolated between the contact surfaces of the bottom surface of fixed disk 102 and the top surface of fixed disk 202.

[0029] When the main measuring rod 201 swings slightly below the bottom of the clamping rod 101, the first shim 4 and the second shim 5 twist and rub against each other, changing the metal surface contact between the original fixed plate 102 and the second fixed plate 202 to ceramic surface contact. This solves the problem of heat generation and wear caused by the friction between metal surfaces. In addition, the zirconia ceramic material has excellent self-lubricating properties, high temperature resistance and ultra-wear resistance, thereby extending the service life of the product and ensuring the accuracy of measurement during processing.

[0030] The present invention has been described in detail above. The specific embodiments are provided only to help understand the method and core idea of ​​the present invention. It should be noted that those skilled in the art can make various improvements and modifications to the present invention without departing from its principles, and these improvements and modifications also fall within the protection scope of the claims of the present invention.

Claims

1. A centering bar for a machining center, characterized in that: include: A clamping rod (101) is provided with a fixing plate (102) at its bottom; The main measuring rod (201) has a secondary measuring rod (203) at its bottom and a second fixing plate (202) at its top. The bottom surface of the first fixing plate (102) is in contact with the top surface of the second fixing plate (202). An elastic connection structure is provided between the center of the clamping rod (101) and the center of the main measuring rod (201) for connecting and assembling the clamping rod (101) and the main measuring rod (201); The self-lubricating component is disposed on the first fixed plate (102) and the second fixed plate (202) by means of a snap-fit ​​structure.

2. A centering bar for a machining center according to claim 1, characterized in that: The elastic connection structure includes a through hole (103) and a blind hole (205). The through hole (103) is located at the center of the clamping rod (101). The blind hole (205) is inserted along the top surface of the second fixing plate (202) and located at the center of the main measuring rod (201). A hook plate (301) is provided at the top opening of the through hole (103). A locking pin (303) is provided on the bottom peripheral wall of the blind hole (205) through a locking hole (302). A tension spring (304) is provided between the hook plate (301) and the locking pin (303).

3. A centering bar for a machining center according to claim 1, characterized in that: The self-lubricating component includes a first gasket (4) and a second gasket (5), both of which are made of high-hardness, high-wear-resistant ceramic material.

4. A centering bar for a machining center according to claim 3, characterized in that: The high-hardness, high-wear-resistant ceramic is zirconium oxide.

5. A centering bar for a machining center according to claim 3, characterized in that: The buckle structure includes a protruding ring (601) and an annular groove (602). The bottom surface of the first fixed plate (102) and the top surface of the second fixed plate (202) are both provided with the protruding ring (601). The top surface of the first gasket (4) and the bottom surface of the second gasket (5) are both provided with the annular groove (602). The annular groove (602) on the first gasket (4) is engaged with the protruding ring (601) on the first fixed plate (102). The annular groove (602) on the second gasket (5) is engaged with the protruding ring (601) on the second fixed plate (202).

6. A centering bar for a machining center according to claim 1, characterized in that: The bottom of the auxiliary measuring rod (203) is provided with a mounting hole (204).

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