Drilling and tapping spindle with helical composite spring drawbar structure

Abstract

The utility model relates to a drilling and tapping main shaft related technical field especially relates to a kind of drilling and tapping main shaft with spiral composite spring broach structure, including mandrel, the high-efficiency lifting mechanism is arranged in the side of mandrel. The drilling and tapping main shaft with spiral composite spring broach structure, by the setting of high-efficiency lifting mechanism, first in natural state, main shaft is in broach state, when this time draw jaw clamps tool shank, when needing to loosen tool, external tool removal arm acts on the plane of tool removal ring, promotes tool removal rod, tool removal rod drives tool removal ring to exert pressure to draw rod, so that draw rod moves downward to overcome the elastic force of composite spring main body, in this process, the support ring of draw rod both ends guarantees its moving stability, draw rod drives draw jaw to descend and open, while composite spring main body is extruded and compressed by spacer sleeve and draw rod, tool shank is separated from draw jaw, and loosening tool action is completed.

Description

Technical Field

[0001] This utility model relates to the technical field of drilling and tapping spindles, and in particular to a drilling and tapping spindle with a helical composite spring puller structure. Background Technology

[0002] Currently, the 3C and other aluminum parts processing industries primarily focus on complex and multi-faceted parts processing. There is a growing trend of replacing 3-axis and 4-axis machines with 5-axis machines, equipped with servo-driven high-speed multi-handle tool magazines. This allows for the completion of all planar and inclined surface processing, as well as hole, thread, and boring processes in a single workpiece clamping. This necessitates faster, more efficient, and more stable machining. However, this rapid, efficient, and stable machining means a significantly increased spindle tool change frequency. In the same processing time, the number of tool changes is more than 1.5 times that of the past. According to our market research, in automotive parts processing, some parts processing steps require up to 8 tool changes within two minutes. The previously used disc-shaped spring broaching tool has a lifespan of only 1 million cycles; with such a high tool change frequency, only about 80% of its normal lifespan is achieved. Therefore, the existing broaching tool structure is no longer sufficient for current machining needs. Hence, a drilling and tapping spindle with a helical composite spring broaching tool structure is specifically required.

[0003] However, existing drilling and tapping spindles with traditional disc-shaped springs are prone to damage and have a short lifespan under high-frequency tool changing conditions. Utility Model Content

[0004] The purpose of this invention is to provide a drilling and tapping spindle with a spiral composite spring puller structure to solve the problems mentioned in the background art, such as the easy damage and short lifespan of the traditional disc spring in existing drilling and tapping spindles under high-frequency tool changing conditions.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a drilling and tapping spindle with a spiral composite spring puller structure, including a mandrel, wherein a high-efficiency lifting mechanism is provided on one side of the mandrel;

[0006] The high-efficiency lifting mechanism includes a pull rod, a cutter rod, a pull claw, a support ring, a composite spring body, a spacer, and a cutter ring. The pull rod is fitted inside the mandrel. The cutter rod is connected to one side of the mandrel. The pull claw is connected to one side of the pull rod. The support ring is sleeved on one side of the pull rod. The composite spring body is sleeved on one side of the pull rod. The spacer is sleeved on one side of the pull rod. The cutter ring is connected to one side of the cutter rod.

[0007] Preferably, the pull rod has a hollow cylindrical structure, and the inner diameter of the pull rod is adapted to the connecting part of the pull claw.

[0008] Preferably, a blade ring is fitted on one side of the surface of the pull rod, and two sets of support rings are provided.

[0009] Preferably, the composite spring body is provided in two sets, and the composite spring body is a double helical composite spring, which is located between the spacer and the pull rod.

[0010] Preferably, the support ring is made of wear-resistant alloy steel, and the pull claw is made of high-strength spring steel.

[0011] Compared with existing technologies, the beneficial effects of this utility model are as follows: This drilling and tapping spindle with a helical composite spring baffle structure, through the precise matching of the hollow cylindrical pull rod and the baffle, ensures the stability and accuracy of tool clamping and releasing actions, while improving the spindle response speed through lightweight design. Two sets of wear-resistant alloy steel support rings are symmetrically distributed, effectively reducing frictional wear between the pull rod and the spindle, enhancing its motion guidance, and significantly improving the high-speed dynamic balance performance of the spindle. The double helical composite spring, with its high elastic coefficient and fatigue resistance, ensures stable elastic force during high-frequency tool changes, forming an efficient and stable force transmission path in conjunction with the spacer and tool clamping ring. The high-strength spring steel baffle, with its excellent toughness and hardness, ensures reliable tool clamping under high-speed cutting. The overall structure not only significantly improves tool changing efficiency and machining accuracy but also greatly extends the equipment maintenance cycle, effectively reducing production costs and fully meeting the stringent requirements of modern precision machining for high efficiency, stability, and durability. Attached Figure Description

[0012] Figure 1 This is a side view of the appearance structure of this utility model;

[0013] Figure 2 This is a schematic diagram of the main structure of the composite spring in the high-efficiency lifting mechanism of this utility model.

[0014] In the diagram: 1. Mandrel; 2. High-efficiency lifting mechanism; 201. Pull rod; 202. Cutting bar; 203. Pull claw; 204. Support ring; 205. Composite spring body; 206. Spacer; 207. Cutting ring. Detailed Implementation

[0015] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0016] Please see Figure 1-2 This utility model provides a technical solution: a drilling and tapping spindle with a spiral composite spring puller structure, including a spindle 1, and a high-efficiency lifting mechanism 2 is provided on one side of the spindle 1;

[0017] The high-efficiency lifting mechanism 2 includes a pull rod 201, a cutter bar 202, a pull claw 203, a support ring 204, a composite spring body 205, a spacer 206, and a cutter ring 207. The pull rod 201 is fitted inside the spindle 1. The cutter bar 202 is connected to one side of the spindle 1. The pull claw 203 is connected to one side of the pull rod 201. The support ring 204 is sleeved on one side of the pull rod 201. The composite spring body 205 has a spacer 206 fitted on one side of the surface of the pull rod 201, and a tool-removing ring 207 connected to one side of the surface of the tool-removing rod 202. In its natural state, the spindle is in a pulling position, with the pull pawl 203 clamping the tool holder. When tool release is required, the external tool-removing arm acts on the plane of the tool-removing ring 207, pushing the tool-removing rod 202. The tool-removing rod 202 then drives the tool-removing ring 207 to apply pressure to the pull rod 201, causing the pull rod 201 to overcome the spring force of the composite spring body 205. As the force moves downward, the support rings 204 at both ends of the pull rod 201 ensure its movement stability. The pull rod 201 drives the pull claw 203 to move downward and open. At the same time, the composite spring body 205 is compressed by the spacer 206 and the pull rod 201. The pull claw 203 opens and separates from the tool holder, completing the tool release action. When pulling the tool, the external tool-removing arm moves away from the tool-removing ring 207, and the composite spring body 205, which is in a compressed state, recovers its deformation, generating an upward thrust that pushes the pull rod 201 upward. The pull rod 201 drives the pull claw 203 to move upward and retract. The pull claw 203 re-clamps the tool holder, completing the tool pull action. Through system control and coordination with the tool magazine, a complete tool change action can be completed. During the entire tool change process, the composite spring body 205 undergoes a cycle of compression and recovery, while the support rings 204 at both ends of the pull rod 201 continuously play a wear-resistant and stable support role, ensuring that the pull rod 201 moves smoothly, thereby greatly improving the dynamic balance stability of the spindle at high speeds.

[0018] Furthermore, the pull rod 201 has a hollow cylindrical structure, and its inner diameter is adapted to the connecting part of the jaw 203. Through the design of the pull rod 201, a tight fit with the jaw 203 can be achieved during use, ensuring that the pull rod 201 can accurately drive the jaw 203 to move synchronously during its up-and-down movement. This avoids wobbling and offset caused by fit gaps, ensuring the accuracy and stability of the tool release and clamping actions. At the same time, the hollow structure reduces the weight of the pull rod 201 while maintaining strength, lowering the spindle rotational inertia and improving the spindle response speed.

[0019] Furthermore, a cutting ring 207 is fitted onto one side of the surface of the pull rod 201, and two sets of support rings 204 are provided. With the support rings 204 provided, during use, the two sets of support rings 204 are symmetrically distributed at both ends of the pull rod 201, which can effectively disperse the pressure generated by the pull rod 201 during the force-driven movement, reduce its friction and wear with the inner wall of the spindle 1, avoid the pull rod 201 from deviating due to unilateral force, and at the same time provide a stable guiding effect for the pull rod 201, so that it always maintains a straight motion trajectory in frequent reciprocating motion, thereby improving the dynamic balance performance of the spindle at high speed.

[0020] Furthermore, the composite spring body 205 is provided in two sets. The composite spring body 205 is a double helical composite spring, located between the spacer 206 and the pull rod 201. Through the arrangement of the composite spring body 205, the two sets of composite spring bodies 205 are spirally wound during use. Compared with traditional springs, the double helical structure of the composite spring body 205 has a higher elastic coefficient and fatigue resistance. Under the same compression stroke, it can provide more stable elastic force output. Moreover, the integrated design avoids the failure risk of multi-component combination. During the tool release process, the composite spring body 205 provides a continuous and stable driving force for the pull rod 201 by compressing and storing energy and releasing elastic potential energy, ensuring that the tool clamping force is constant and meeting the needs of high-frequency tool changing.

[0021] Furthermore, the support ring 204 is made of wear-resistant alloy steel, and the pull claw 203 is made of high-strength spring steel. Through the design of the pull claw 203, the high-strength spring steel gives the pull claw 203 excellent toughness and resistance to deformation during use, making it less prone to plastic deformation or breakage during frequent opening and closing actions, ensuring a long-term stable tool clamping force. At the same time, the high hardness ensures that the pull claw 203 and the tool holder form a reliable engagement, which can firmly fix the tool even under the vibration and impact generated by high-speed cutting, ensuring machining accuracy and safety.

[0022] Working principle: In its natural state, the spindle is in the drawbar position, with the drawbar 203 clamping the tool holder. When tool release is required, the external tool-removing arm acts on the plane of the tool-removing ring 207, pushing the tool-removing rod 202. The tool-removing rod 202 drives the tool-removing ring 207 to apply pressure to the pull rod 201, causing the pull rod 201 to move downwards against the elastic force of the composite spring body 205. During this process, the support rings 204 at both ends of the pull rod 201 ensure its stability. The pull rod 201 drives the drawbar 203 to move downwards and open. At the same time, the composite spring body 205 is compressed by the spacer 206 and the pull rod 201, causing the drawbar 203 to open and separate from the tool holder, completing the tool release action. When the tool is pulled back, the external tool-removing arm moves away from the tool-removing ring 207, and the composite spring body 205, which is in a compressed state, recovers its deformation, generating an upward thrust that pushes the pull rod 201 upward. The pull rod 201 drives the pull pawl 203 to move upward and retract, and the pull pawl 203 re-clamps the tool holder, completing the tool pulling action. Through system control and coordination with the tool magazine, a complete tool change action can be completed. During the entire tool change process, the composite spring body 205 undergoes a cycle of compression and recovery, while the support rings 204 at both ends of the pull rod 201 continuously play a wear-resistant and stable support role, ensuring that the pull rod 201 moves smoothly, thereby greatly improving the dynamic balance stability of the spindle at high speeds.

[0023] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A drilling and tapping spindle with a helical composite spring broaching structure, comprising a mandrel (1), characterized in that: A high-efficiency lifting mechanism (2) is provided on one side of the mandrel (1); The high-efficiency lifting mechanism (2) includes a pull rod (201), a cutter bar (202), a pull claw (203), a support ring (204), a composite spring body (205), a spacer (206), and a cutter ring (207). The pull rod (201) is fitted inside the spindle (1). The cutter bar (202) is connected to one side of the surface of the spindle (1). The pull claw (203) is connected to one side of the pull rod (201). The support ring (204) is sleeved on one side of the surface of the pull rod (201). The composite spring body (205) is sleeved on one side of the surface of the pull rod (201). The spacer (206) is sleeved on one side of the surface of the pull rod (201). The cutter ring (207) is connected to one side of the surface of the cutter bar (202).

2. The drilling and tapping spindle with a helical composite spring broaching structure according to claim 1, characterized in that: The pull rod (201) has a hollow cylindrical structure, and the inner diameter of the pull rod (201) is adapted to the connecting part of the pull claw (203).

3. A drilling and tapping spindle with a helical composite spring broaching structure according to claim 1, characterized in that: A blade ring (207) is fitted on one side of the surface of the pull rod (201), and two sets of support rings (204) are provided.

4. A drilling and tapping spindle with a helical composite spring broaching structure according to claim 1, characterized in that: The composite spring body (205) is provided in two sets. The composite spring body (205) is a double helical composite spring. The composite spring body (205) is located between the spacer (206) and the pull rod (201).

5. A drilling and tapping spindle with a helical composite spring broaching structure according to claim 1, characterized in that: The support ring (204) is made of wear-resistant alloy steel, and the pull claw (203) is made of high-strength spring steel.

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