An adjustable drilling positioner for CNC machine tool spindles

Abstract

This utility model discloses an adjustable drilling positioner for CNC machine tool spindles, belonging to the technical field of CNC machine tool machining auxiliary equipment, including a connecting shaft fixed end structure. An axial adjusting cylinder is coaxially sleeved on the outside of the positioning rod body, and the two are connected by a precision threaded pair (such as a trapezoidal thread or ball screw). Rotating the adjusting cylinder drives its axial movement, achieving stepless precision adjustment of the drilling depth. The outer wall of the adjusting cylinder has scale lines for easy quantitative adjustment, and a symmetrical locking assembly (including a handle, a threaded shaft, and a limit block with anti-slip pads) ensures stable locking after displacement. The end structure consists of a positioning end, an eccentric sleeve, and a fixed sleeve. The eccentric sleeve is slidably connected to the positioning end through a slot / block structure, allowing for radial fine adjustment of the eccentricity to compensate for centering deviations, and precise control of offset in conjunction with the scale lines. The working end of the eccentric sleeve is inlaid with hard alloy or diamond wear-resistant plates, significantly improving the durability of the contact surface.

Description

Technical Field

[0001] This utility model belongs to the technical field of auxiliary equipment for CNC machine tool processing, and specifically relates to an adjustable drilling positioner for CNC machine tool spindle. Background Technology

[0002] In CNC machine tool drilling, accurately positioning the hole depth and position is crucial to ensuring machining quality.

[0003] Traditional positioners often employ fixed structures or simple shim adjustments, which have significant limitations: axial depth adjustment requires repeated disassembly and replacement of shims, resulting in low efficiency and a tendency to introduce cumulative errors; they lack radial fine-tuning capabilities, making it difficult to compensate for minor eccentricities in tool or workpiece clamping; and the positioning end face is prone to wear over long-term use, leading to datum drift. Especially in high-precision, multi-batch machining scenarios, these problems significantly reduce machining consistency and increase setup time.

[0004] To address these issues, a positioner with high-precision bidirectional adjustment capabilities is needed. The new design must meet the following requirements: stepless axial depth adjustment via a precision threaded mechanism, eliminating the need for disassembly; an integrated, reliable locking structure to prevent machining displacement; added radial eccentricity compensation to improve centering accuracy; and enhanced end-face wear resistance to maintain long-term positioning stability. These improvements will significantly reduce auxiliary time, adapt to complex working conditions, and meet the stringent requirements of precision drilling. Utility Model Content

[0005] The purpose of this invention is to provide an adjustable drilling positioner for CNC machine tool spindles to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution: an adjustable drilling positioner for CNC machine tool spindles, comprising a positioning rod body, the positioning rod body being cylindrical, and one end of the positioning rod body being provided with a standard tool holder connecting part for connecting with a CNC machine tool spindle interface (such as a BT tool holder or an HSK tool holder). An axial adjustment cylinder is coaxially sleeved on the outside of the positioning rod body, and the inner wall of the axial adjustment cylinder is connected to the outer wall of the positioning rod body through an axial adjustment threaded pair. Rotating the axial adjustment cylinder can drive it to move along the axial direction of the positioning rod body, and a connecting shaft is fixedly connected to the lower end of the positioning rod body, and an end structure is fixedly connected to the lower end of the connecting shaft.

[0007] It should be noted in the solution that the axial adjusting thread pair is a precision trapezoidal thread or a ball screw pair.

[0008] It is worth noting that the lower end of the outer curved surface of the axial adjusting cylinder is provided with symmetrical threaded holes, and the symmetrical threaded holes are respectively threaded to the outer surface of the threaded shaft. The lower end of the inner curved surface of the axial adjusting cylinder is provided with a limiting groove on one side of the symmetrical threaded holes. A rotating handle is fixedly connected to one end of the threaded shaft, and an arc-shaped limiting block is fixedly connected to the other end of the threaded shaft.

[0009] Furthermore, it should be noted that the limiting blocks are all slidably connected to the inner surface of the limiting groove, and an anti-slip pad is fixedly connected to one side of the limiting block, and a rubber pad is provided on the outer surface of the threaded shaft on the side of the rotating handle.

[0010] In a preferred embodiment, the outer circumferential surface of the axial adjusting cylinder is provided with a first axial scale line.

[0011] In a preferred embodiment, the end structure includes a positioning end, an eccentric sleeve, and a fixing sleeve. The positioning end has a mounting groove in the middle of one side, and several slots on the outer side of the mounting groove. A limiting post is fixedly connected to the outer surface of one side of the positioning end between adjacent slots. The eccentric sleeve has several locking blocks on one side, each locking block slidingly engaging with a slot. The other side of the eccentric sleeve has several positioning holes, each positioning hole slidingly engaging with a corresponding limiting post. A second axial scale line is provided on the other side of the eccentric sleeve near the positioning hole. The fixing sleeve is threaded to the outer surface of the positioning end, and a through hole is provided in the middle of the fixing sleeve.

[0012] In a preferred embodiment, the working end face of the eccentric sleeve is inlaid with a wear-resistant plate made of hard alloy or diamond, which extends through the through hole.

[0013] Compared with the prior art, the adjustable drilling positioner for CNC machine tool spindles provided by this utility model has at least the following beneficial effects:

[0014] (1) This positioner, through its unique axial adjustment mechanism (precision thread or ball screw pair driving the adjustment cylinder to rotate), can continuously and precisely adjust the position of the positioning end relative to the machine tool spindle. Compared with traditional methods such as shim stacking, this adjustment method is simpler and faster to operate (only the adjustment cylinder needs to be rotated), and thanks to the cooperation of the precision thread pair and the axial scale line, it can achieve very high fine-tuning accuracy. This directly ensures precise control of drilling depth, reduces the scrap rate caused by depth error, and significantly improves the efficiency of tool changing and setting new drilling depth, making it especially suitable for occasions that require frequent depth adjustments or precision hole machining.

[0015] (2) The end structure of this positioner is ingeniously designed. Through the interlocking of a replaceable eccentric sleeve with the positioning end (slot / block, limit post / positioning hole structure), it allows for minute radial adjustments to the eccentric sleeve before the fixed sleeve is locked. Combined with the second axial scale line on the end, this design enables the positioner to not only precisely control the axial depth but also compensate for minor installation eccentricities or systematic errors in the tool or workpiece, fine-tuning the final positioning point (hole center) in the radial plane. This greatly enhances the positioner's adaptability to different working conditions and minor deviations in the tool or workpiece, improving positioning accuracy and reliability, helping to achieve higher hole position accuracy, and reducing machining problems caused by misalignment. The embedded wear-resistant pads also significantly improve the durability of the positioning contact surface. Attached Figure Description

[0016] Figure 1 This is a front structural diagram of the present invention;

[0017] Figure 2 This is a schematic diagram of the axial adjusting cylinder structure of this utility model;

[0018] Figure 3 This is a schematic diagram of the end structure of this utility model.

[0019] In the diagram: 1. Positioning rod body; 101. Standard tool holder connecting part; 2. Axial adjustment cylinder; 201. Adjusting thread pair; 202. Threaded hole; 203. Limiting groove; 204. Threaded shaft; 205. Rotating handle; 206. Limiting block; 207. Anti-slip pad; 208. Rubber pad; 209. First axial scale line; 3. Connecting shaft; 4. End structure; 401. Positioning end; 4011. Mounting groove; 4012. Slot; 4013. Limiting post; 402. Eccentric sleeve; 4021. Slot; 4022. Positioning hole; 4023. Second axial scale line; 4024. Wear-resistant plate; 403. Fixing sleeve; 4031. Through hole. Detailed Implementation

[0020] The present invention will be further described below with reference to the embodiments.

[0021] Please see Figure 1-3 This utility model provides an adjustable drilling positioner for CNC machine tool spindles, comprising: a positioning rod body 1, which is cylindrical, and one end of the positioning rod body 1 is provided with a standard tool holder connection part 101 for connecting with a CNC machine tool spindle interface such as a BT tool holder or an HSK tool holder; an axial adjustment cylinder 2 is coaxially sleeved on the outside of the positioning rod body 1; the inner wall of the axial adjustment cylinder 2 is connected to the outer wall of the positioning rod body 1 through an axial adjustment threaded pair 201; rotating the axial adjustment cylinder 2 can drive it to move along the axial direction of the positioning rod body 1; and a connecting shaft 3 is fixedly connected to the lower end of the positioning rod body 1, and an end structure 4 is fixedly connected to the lower end of the connecting shaft 3.

[0022] Further as Figure 2 As shown, it is worth noting that the axial adjusting thread pair 201 is a precision trapezoidal thread or a ball screw pair. By using a precision trapezoidal thread or a ball screw pair in the axial adjusting thread pair 201, the accuracy and smoothness of the axial displacement can be significantly improved. The precision trapezoidal thread has high load-bearing capacity and self-locking properties, while the ball screw pair has a low coefficient of friction and high transmission efficiency. Both can ensure more precise and stable rotational movement of the axial adjusting cylinder 2, avoiding backlash errors caused by thread clearance, thereby meeting the requirements of high-precision drilling depth control.

[0023] Further as Figure 2 As shown, it is worth noting that the lower end of the outer curved surface of the axial adjusting cylinder 2 is provided with symmetrical threaded holes 202, which are threaded to the outer surface of the threaded shaft 204. The lower end of the inner curved surface of the axial adjusting cylinder 2 is provided with a limiting groove 203 on one side of the symmetrical threaded holes 202. One end of the threaded shaft 204 is fixedly connected to a rotating handle 205, and the other end of the threaded shaft 204 is fixedly connected to an arc-shaped limiting block 206. Through the cooperation of the symmetrical threaded holes 202, the threaded shaft 204, the limiting groove 203, the rotating handle 205, and the arc-shaped limiting block 206, fast and reliable axial locking is achieved. Rotating the rotating handle 205 can push the limiting block 206 to slide along the limiting groove 203 and press against the positioning rod body 1, forming a multi-point symmetrical locking force, which effectively prevents the axial adjusting cylinder 2 from loosening and shifting during processing vibration, and ensures the stability of the depth reference.

[0024] Further as Figure 2 As shown, it is worth noting that the limiting blocks 206 are all slidably connected to the inner surface of the limiting groove 203, and an anti-slip pad 207 is fixedly connected to one side of the limiting block 206. The outer surface of the threaded shaft 204 is provided with a rubber pad 208 on the side of the rotating handle 205. The sliding engagement between the limiting blocks 206 and the limiting groove 203 ensures that the direction of the locking force is controllable. The anti-slip pad 207 on the limiting block 206 increases the frictional resistance with the positioning rod body 1, improving the locking reliability. The rubber pad 208 on the threaded shaft 204 provides buffering and anti-slip functions when operating the rotating handle 205, enhancing the human-machine interaction experience.

[0025] This solution includes the following steps: Installation and initial positioning:

[0026] First, insert the standard tool holder connection 101 of the positioning rod body 1 into the standard interface (such as BT or HSK tool holder interface) of the CNC machine tool spindle and clamp it in place. At this time, the entire positioning device moves with the spindle. The working end face (or wear-resistant plate 4024) of the positioning end 401 contacts the pre-positioning surface of the workpiece to be processed.

[0027] Axial depth fine adjustment:

[0028] The axial adjusting cylinder 2 is rotated and fitted onto the outside of the positioning rod body 1. Since the inner wall of the axial adjusting cylinder 2 is connected to the outer wall of the positioning rod body 1 via an axial adjusting thread pair 201 (precision trapezoidal thread or ball screw pair), rotating the axial adjusting cylinder 2 will drive it to move precisely along the axial direction of the positioning rod body 1. By observing the first axial scale line 209 on the outer circumference of the axial adjusting cylinder 2, the displacement of the axial adjusting cylinder 2 can be precisely controlled. This displacement is directly transmitted to the end structure 4 via the connecting shaft 3, thereby precisely adjusting the axial extension length (i.e., drilling depth reference) of the positioning end 401 relative to the workpiece surface.

[0029] Axial position locking:

[0030] After the axial depth is adjusted to the correct position, turn the symmetrically arranged rotating handles 205. Turning the handles 205 causes the threaded shaft 204 to screw in or out of the symmetrical threaded holes 202 at the lower end of the axial adjusting cylinder 2. The advancement of the threaded shaft 204 drives the arc-shaped limiting block 206, which is fixed to it, to slide within the limiting groove 203 on the inner side of the axial adjusting cylinder 2. Finally, the anti-slip pad 207 on one side of the limiting block 206 presses tightly against the outer wall of the positioning rod body 1, generating sufficient friction to firmly lock the axial adjusting cylinder 2 in its current position, preventing displacement due to vibration or force during processing. The rubber pad 208 provides comfort during tightening.

[0031] Radial eccentricity fine adjustment (optional):

[0032] To compensate for minor eccentricity, slightly loosen the retaining sleeve 403. The locking block 4021 on one side of the eccentric sleeve 402 can slide within the slot 4012 of the positioning end 401, while the limiting post 4013 on the positioning end 401 slides within the positioning hole 4022 of the eccentric sleeve 402. This sliding allows for a controllable radial offset of the eccentric sleeve 402 (and its wear-resistant plate 4024) relative to the center of the positioning end 401. The offset can be read using the second axial scale line 4023 on the eccentric sleeve 402. After adjustment, retighten the retaining sleeve 403. The retaining sleeve 403 presses the eccentric sleeve 402 through its through hole 4031, firmly securing it to the positioning end 401 using friction, and locking the wear-resistant plate 4024 in the adjusted radial position.

[0033] Execute location:

[0034] After all adjustments are completed and locked, the machine tool spindle drives the positioner to move, precisely aligning the final positioning point (the center or edge of the wear-resistant pad 4024) with the predetermined hole position, providing an accurate starting position reference for subsequent drill bits. The wear-resistant pad 4024 ensures high wear resistance and positioning accuracy at the contact point.

[0035] As can be seen from the above working process, the axial adjusting thread pair 201 adopts a precision trapezoidal thread or a ball screw pair, which can significantly improve the accuracy and smoothness of axial displacement. The precision trapezoidal thread has high load-bearing capacity and self-locking properties, while the ball screw pair has a low coefficient of friction and high transmission efficiency. Both can ensure that the rotation and movement of the axial adjusting cylinder 2 are more precise and stable, avoiding backlash errors caused by thread clearance, thereby meeting the requirements of high-precision drilling depth control. Through the cooperation of the symmetrical threaded hole 202, threaded shaft 204, limiting groove 203, rotating handle 205 and arc-shaped limiting block 206, fast and reliable axial locking is achieved. Rotating the handle 205 pushes the limit block 206 to slide along the limit groove 203 and press against the positioning rod body 1, forming a multi-point symmetrical locking force. This effectively prevents the axial adjusting cylinder 2 from loosening or shifting during processing vibration, ensuring the stability of the depth reference. The sliding fit between the limit block 206 and the limit groove 203 ensures that the direction of the locking force is controllable. The anti-slip pad 207 on the limit block 206 increases the frictional resistance with the positioning rod body 1, improving locking reliability. The rubber pad 208 on the threaded shaft 204 provides buffering and anti-slip functions when operating the handle 205, enhancing the human-machine interaction experience.

[0036] Further as Figure 2 As shown, it is worth noting that the outer circumferential surface of the axial adjustment cylinder 2 is provided with a first axial scale line 209. The first axial scale line 209 on the outer circumferential surface of the axial adjustment cylinder 2 provides an intuitive displacement reference. The operator can directly read the number of rotations or the amount of displacement, realize the rapid and quantitative adjustment of the drilling depth, reduce the time of repeated trial cutting and tool setting, and greatly improve the machine adjustment efficiency.

[0037] Further as Figure 3As shown, it is worth noting that the end structure 4 includes a positioning end 401, an eccentric sleeve 402, and a fixing sleeve 403. The positioning end 401 has a mounting groove 4011 in the middle of one side, and several slots 4012 are provided on the outer side of the mounting groove 4011. Limiting posts 4013 are fixedly connected to the outer surface of one side of the positioning end 401 between adjacent slots 4012. The eccentric sleeve 402 has several locking blocks 4021 on one side, each locking block 4021 engaging with and slidingly connecting to a slot 4012. The other side of the eccentric sleeve 402 has several positioning holes 4022, each positioning hole 4022 engaging with and slidingly connecting to a corresponding limiting post 4012. 13. The eccentric sleeve 402 has a second axial scale line 4023 on the other side of the positioning hole 4022. The fixing sleeve 403 is threaded to the outer surface of the positioning end 401, and the fixing sleeve 403 has a through hole 4031 in the middle. Through the sliding fit between the end structure 4's slot 4012 and the slot block 4021, and the guidance of the limiting post 4013 and the positioning hole 4022, the eccentric sleeve 402 can be radially translated and finely adjusted relative to the positioning end 401. The second axial scale line 4023 quantifies the offset, facilitating compensation for tool or workpiece installation eccentricity. The fixing sleeve 403 achieves rigid fixation after adjustment by threading the eccentric sleeve 402. This design expands the radial correction capability of the positioner and improves the hole positioning accuracy.

[0038] Further as Figure 3 As shown, it is worth noting that the working end face of the eccentric sleeve 402 is inlaid with a wear-resistant plate 4024 made of hard alloy or diamond, which passes through the through hole 4031. The hard alloy or diamond wear-resistant plate 4024 inlaid at the working end of the eccentric sleeve 402 is exposed to the contact surface through the through hole 4031 of the fixed sleeve 403. Its ultra-high hardness and wear resistance can resist frequent positioning friction, significantly extend the end life, avoid positioning point drift caused by wear, and ensure positioning consistency under long-term use.

[0039] In summary: The first axial scale line 209 on the outer circumference of the axial adjusting cylinder 2 provides an intuitive displacement reference, allowing the operator to directly read the number of rotations or the amount of displacement, enabling rapid and quantitative adjustment of the drilling depth, reducing the time spent on repeated trial cuts and tool setting, and significantly improving machine adjustment efficiency; the sliding fit between the slot 4012 and the block 4021 of the end structure 4, and the guidance of the limiting post 4013 and the positioning hole 4022, allow the eccentric sleeve 402 to be radially translated and finely adjusted relative to the positioning end 401; the second axial scale line 4023 quantifies the offset, facilitating compensation for tool or workpiece installation eccentricity; the fixing sleeve 403 achieves rigid fixation after adjustment by tightening the eccentric sleeve 402 with threads. This design expands the radial correction capability of the positioner and improves the positioning accuracy of the hole. The hard alloy or diamond wear-resistant plate 4024 embedded in the working end of the eccentric sleeve 402 is exposed to the contact surface through the through hole 4031 of the fixed sleeve 403. Its ultra-high hardness and wear resistance can resist frequent positioning friction, significantly extend the end life, avoid positioning point drift caused by wear, and ensure positioning consistency under long-term use.

[0040] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A adjustable drilling positioner for CNC machine tool spindle comprising a positioner stem body (1) characterized in that: The positioning rod body (1) is cylindrical, and one end of the positioning rod body (1) is provided with a standard tool holder connection part (101) for connecting with the CNC machine tool spindle interface. An axial adjustment cylinder (2) is coaxially sleeved on the outside of the positioning rod body (1). The inner wall of the axial adjustment cylinder (2) is connected to the outer wall of the positioning rod body (1) through an axial adjustment thread pair (201). Rotating the axial adjustment cylinder (2) can drive it to move along the axial direction of the positioning rod body (1). A connecting shaft (3) is fixedly connected to the lower end of the positioning rod body (1), and an end structure (4) is fixedly connected to the lower end of the connecting shaft (3).

2. A variable drilling positioner for a spindle of a numerically controlled machine tool according to claim 1, characterized in that: The axial adjusting thread pair (201) is a precision trapezoidal thread or a ball screw pair.

3. A variable drilling positioner for a spindle of a numerically controlled machine tool according to claim 2, characterized in that: The lower end of the outer curved surface of the axial adjusting cylinder (2) is provided with symmetrical threaded holes (202), and the symmetrical threaded holes (202) are respectively threaded to the outer surface of the threaded shaft (204). The lower end of the inner curved surface of the axial adjusting cylinder (2) is provided with a limiting groove (203) on one side of the symmetrical threaded holes (202). One end of the threaded shaft (204) is fixedly connected with a rotating handle (205), and the other end of the threaded shaft (204) is fixedly connected with an arc-shaped limiting block (206).

4. A variable drilling positioner for a spindle of a numerically controlled machine tool according to claim 3, characterized in that: The limiting blocks (206) are all slidably connected to the inner surface of the limiting groove (203), and an anti-slip pad (207) is fixedly connected to one side of the limiting block (206), and a rubber pad (208) is provided on the outer surface of the threaded shaft (204) on the side of the rotating handle (205).

5. A variable drilling positioner for a spindle of a numerically controlled machine tool according to claim 4, characterized in that: The outer circumference of the axial adjusting cylinder (2) is provided with a first axial scale line (209).

6. An adjustable drilling positioner for CNC machine tool spindles according to claim 5, characterized in that: The end structure (4) includes a positioning end (401), an eccentric sleeve (402), and a fixing sleeve (403). The positioning end (401) has a mounting groove (4011) in the middle of one side, and several slots (4012) are provided on the outer side of the mounting groove (4011). A limiting post (4013) is fixedly connected to the outer surface of one side of the positioning end (401) between adjacent slots (4012). Several locking blocks (4021) are provided on one side of the eccentric sleeve (402). The locking blocks (4021) have several locking blocks on one side. Each of the eccentric sleeves (402) is slidably connected to the slot (4012), and each of the other sides of the eccentric sleeve (402) is provided with a number of positioning holes (4022). The positioning holes (4022) are slidably connected to the corresponding limiting posts (4013), and the other side of the eccentric sleeve (402) is provided with a second axial scale line (4023) on one side of the positioning hole (4022). The fixed sleeve (403) is threaded to the outer surface of the positioning end (401), and the fixed sleeve (403) is provided with a through hole (4031) in the middle.

7. An adjustable drilling positioner for CNC machine tool spindles according to claim 6, characterized in that: The working end face of the eccentric sleeve (402) is inlaid with a wear-resistant plate (4024) made of hard alloy or diamond, which extends through the through hole (4031).

Images