A fixing device for screw turning

Abstract

This utility model relates to the field of lead screw machining technology, and in particular to a fixing device for lead screw turning. It includes a movable seat slidably mounted on the guide rail of a machine tool. A connecting mechanism is provided on one side of the movable seat, and the connecting mechanism is connected to the tool post slide of the machine tool, so that the movable seat can move synchronously with the tool post slide. A support frame is provided on the movable seat, and a fixing ring is connected to the support frame. The central axis of the fixing ring is coaxial with the rotation center of the machine tool spindle, and the fixing ring has an open end for accommodating the lead screw. This device provides continuous support to the lead screw by being close to the machined side of the cutting tool, effectively suppressing problems such as tool deflection vibration caused by cutting forces during the turning process of slender lead screws, thus improving the quality of lead screw turning.

Description

Technical Field

[0001] This utility model relates to the field of lead screw machining technology, and in particular to a fixing device for lead screw turning. Background Technology

[0002] As a core component of mechanical transmission systems, lead screws are widely used in CNC machine tools, precision instruments, and automated equipment. Their machining quality directly affects the positioning accuracy, transmission efficiency, and operational stability of the entire equipment. The structural characteristic of lead screws is their large length-to-diameter ratio. Especially slender lead screws are prone to deflection deformation during turning due to their own weight, cutting forces, and vibrations. This leads to problems such as pitch error, roundness deviation of the pitch diameter, and decreased surface quality in the machined thread section, and in severe cases, even causes the workpiece to be scrapped.

[0003] In traditional lead screw turning, a center rest is often used as an auxiliary support device to suppress workpiece deformation. However, the center rest is usually fixed to the machine tool bed and cannot move synchronously with the tool post, thus it is only suitable for segmented machining or machining of short lead screws with high rigidity. As the machining position gradually approaches the machine tool tip, the workpiece's support rigidity decreases, easily leading to vibration. This vibration not only affects the stability of the cutting process but also interferes with the normal cutting state of the tool, ultimately resulting in a decrease in the machining quality of the lead screw. Utility Model Content

[0004] The purpose of this invention is to address the shortcomings of existing technologies where, during the turning process, the machining position of the lead screw gradually approaches the machine tool tip, causing a decrease in the support stiffness of the workpiece, which easily leads to vibration and a decline in the machining quality of the lead screw. Therefore, this invention proposes a fixing device for lead screw turning.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: A fixing device for lead screw turning is designed, including a movable seat slidably mounted on the guide rail of a machine tool. A connecting mechanism is provided on one side of the movable seat, which is connected to the tool post slide of the machine tool so that the movable seat can move synchronously with the tool post slide. A support frame is provided on the movable seat, and a fixing ring is connected to the support frame. The central axis of the fixing ring is coaxial with the rotation center of the machine tool spindle. An open end is provided on the fixing ring to accommodate the lead screw. A plurality of fixing clamping blocks are evenly arranged circumferentially inside the fixing ring. A plurality of telescopic components are provided inside the fixing ring, and the telescopic components are respectively connected to the fixing clamping blocks to clamp or release the finished turn section of the lead screw.

[0006] Preferably, the telescopic assembly includes a connecting seat connected within a fixed ring, one end of which is connected to an electric telescopic rod, and the output end of the electric telescopic rod is connected to a fixed clamping block.

[0007] Preferably, a support roller is connected to one side of the fixed clamping block. The wheel surface of the support roller is used to contact the surface of the lead screw. The support roller is inclined relative to the lead screw, so that the mounting axis of the support roller does not coincide with the center line of the lead screw. This allows the support roller to have a certain axial self-adaptive capability while rotating with the lead screw, thereby reducing friction and wear.

[0008] Preferably, the surface of the support roller is a smooth cemented carbide cylindrical surface, which is nitrided to improve wear resistance and reduce the coefficient of friction.

[0009] Preferably, the connecting mechanism includes a plurality of connecting rods, one end of which is connected to a movable seat, and one end of each of the plurality of connecting rods is connected to a mounting joint, and the plurality of mounting joints are connected to reserved bolt holes on the machine tool tool post slide.

[0010] Preferably, the bottom of the support frame is provided with a reinforcing rod, one end of which is connected to the movable seat, and a secondary rod is threaded to one side of the reinforcing rod. One end of the secondary rod is connected to the outside of the fixed ring, which is used to finely adjust the axial and height position of the fixed ring to ensure that it is concentric with the main shaft.

[0011] The present invention provides a fixing device for lead screw turning, which has the following advantages: 1. The open end eliminates the need for the lead screw to be inserted through the shaft end, making the installation and removal of the lead screw very convenient and simplifying the operation; the device provides continuous support for the lead screw on the side that has been machined by the cutting tool, effectively suppressing problems such as tool deflection vibration caused by cutting force during the turning process of slender lead screws, thereby improving the quality of lead screw turning.

[0012] 2. The mounting axis of the support roller does not coincide with the center line of the lead screw, so that the support roller has a certain axial self-adaptive ability while rotating with the lead screw, reducing friction and wear. This transforms the sliding friction between the lead screw and several fixed clamping blocks into rolling friction between the support roller and the lead screw, greatly reducing friction loss and improving the service life of the device. Attached Figure Description

[0013] Figure 1 This utility model provides a schematic diagram of the structure of a fixing device for lead screw turning. Figure 1 .

[0014] Figure 2 This utility model provides a schematic diagram of the structure of a fixing device for lead screw turning. Figure 2 .

[0015] Figure 3 This is a schematic diagram of the structure of the fixing device for lead screw turning proposed in this utility model during its use on a machine tool.

[0016] Figure 4 for Figure 4 A magnified view of a portion at point A.

[0017] In the diagram: 1. Movable seat; 2. Connecting rod; 3. Support frame; 4. Fixing ring; 5. Open end; 6. Fixing clamp; 7. Connecting seat; 8. Electric telescopic tube; 9. Support roller; 10. Reinforcing rod; 11. Sub-rod; 12. Mounting connector. Detailed Implementation

[0018] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0019] Example 1: Refer to Figure 1-4 A fixing device for lead screw turning includes a movable base 1, which is slidably mounted on the guide rail of a machine tool. A connecting mechanism is provided on one side of the movable base 1, and the connecting mechanism is connected to the tool post slide of the machine tool. The connecting mechanism includes several connecting rods 2, one end of which is connected to the movable base 1, and one end of each connecting rod 2 is connected to a mounting joint 12. The mounting joints 12 are connected to pre-drilled bolt holes on the tool post slide of the machine tool, so that the movable base 1 can move synchronously with the tool post slide. A support frame 3 is provided on the movable base 1, and the support frame 3 is connected to... There is a fixed ring 4, the central axis of which is coaxial with the rotation center of the machine tool spindle. The fixed ring 4 has an open end 5 for accommodating the lead screw. Several fixed clamping blocks 6 are evenly arranged in the inner circumference of the fixed ring 4. Several telescopic components are provided inside the fixed ring 4. The telescopic components are respectively connected to the fixed clamping blocks 6. The telescopic components include a connecting seat 7 connected inside the fixed ring 4. One end of the connecting seat 7 is connected to an electric telescopic rod 8. The output end of the electric telescopic rod 8 is connected to the fixed clamping block 6, so that the fixed clamping block 6 clamps or releases the machined smooth rod section.

[0020] Operating procedure: Install the movable seat 1 on the machine tool guide rail. After connecting the movable seat 1 to the tool post slide through several mounting joints 12, when the tool post slide carries the cutting tool to perform turning feed along the guide rail, the entire fixing device will move synchronously. Then adjust the position of the fixing ring 4 so that the central axis of the fixing ring 4 is coaxial with the rotation center of the machine tool spindle. The lead screw blank to be processed is clamped on the machine tool by the chuck and center. First, a smooth reference cylindrical surface is machined at the end of the lead screw near the chuck, which is the polished section of the lead screw. Then, the tool holder slide carries the cutting tool and the device back, so that the fixed ring 4 moves above the machined polished section. The electric telescopic rod 8 is activated, which drives all the fixed clamping blocks 6 to extend at the same time and firmly hold the machined polished section. The subsequent polished section is then machined. The tool holder slide moves longitudinally with the cutting tool and the device in sync. The cutting tool cuts the unmachined part of the leadscrew, while the fixing device provides continuous support for the leadscrew on the machined side adjacent to the cutting tool. This effectively suppresses problems such as tool deflection and vibration caused by cutting force during the turning process of slender leadscrews, thereby improving the quality of leadscrew turning.

[0021] Example 2: In Example 1, since several fixed clamping blocks 6 directly clamp the lead screw, the relationship between them is one of sliding friction. Long-term use easily leads to significant wear at the contact points between the fixed clamping blocks and the lead screw, reducing the service life of the device. Based on Example 1, optimizations are made, referring to… Figure 1-4 A support roller 9 is connected to one side of the fixed clamping block 6. The wheel surface of the support roller 9 is used to contact the surface of the lead screw. The support roller 9 is set at an angle relative to the lead screw, so that the mounting axis of the support roller 9 does not coincide with the center line of the lead screw. This allows the support roller 9 to have a certain axial self-adaptive ability while rotating with the lead screw, reducing friction and wear. The wheel surface of the support roller 9 is a smooth hard alloy cylindrical surface, and the surface can be nitrided to improve wear resistance and reduce the coefficient of friction. This transforms the sliding friction between the lead screw and several fixed clamping blocks 6 into rolling friction between the support roller 9 and the lead screw, greatly reducing friction loss and improving the service life of the device.

[0022] Example 3: In Example 1, even if the three-jaw chuck has been calibrated, the axis of the lead screw it holds may still have slight fluctuations, making it difficult for the central axis of the retaining ring 4 to completely coincide with the axis of the main shaft, thus reducing the effectiveness of the clamping device in fixing the lead screw. Based on Example 1, optimizations are made, referring to... Figure 1-4 The bottom of the support frame 3 is provided with a reinforcing rod 10. One end of the reinforcing rod 10 is connected to the movable seat 1. A secondary rod 11 is threadedly connected to one side of the reinforcing rod 10. One end of the secondary rod 11 is connected to the outside of the fixed ring 4. It is used to fine adjust the axial and height position of the fixed ring 4, suppressing the axial offset caused by clamping deviation or deformation under force, thereby improving the reinforcement effect of the lead screw and improving the quality of the lead screw after machining.

[0023] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A fixing device for screw turning machining, comprising a moving seat (1), characterized in that, The movable seat (1) is slidably mounted on the guide rail of the machine tool. A connecting mechanism is provided on one side of the movable seat (1). The connecting mechanism is connected to the tool post slide of the machine tool so that the movable seat (1) can move synchronously with the tool post slide. A support frame (3) is provided on the movable seat (1). A fixed ring (4) is connected to the support frame (3). The central axis of the fixed ring (4) is coaxial with the rotation center of the machine tool spindle. An open end (5) is provided on the fixed ring (4) to accommodate the lead screw. Several fixed clamping blocks (6) are arranged inside the fixed ring (4). Several telescopic components are provided inside the fixed ring (4). Several telescopic components are respectively connected to several fixed clamping blocks (6) so that the fixed clamping blocks (6) grip or release the finished polished rod section.

2. The fixing device for screw turning according to claim 1, characterized in that The telescopic assembly includes a connecting seat (7) connected inside the fixed ring (4), one end of which is connected to an electric telescopic rod (8), and the output end of the electric telescopic rod (8) is connected to a fixed clamp (6).

3. The fixing device for turning a ball screw according to claim 2, wherein The fixed clamp (6) is connected to a support roller (9) on one side. The wheel surface of the support roller (9) is used to contact the surface of the lead screw. The support roller (9) is set at an inclination relative to the lead screw so that the mounting axis of the support roller (9) does not coincide with the center line of the lead screw.

4. The fixing device for turning a ball screw according to claim 3, wherein The surface of the support roller (9) is a smooth cylindrical surface.

5. The fixing device for screw turning according to claim 1, wherein The connecting mechanism includes several connecting rods (2), one end of which is connected to the movable seat (1), and one end of each of the several connecting rods (2) is connected to an installation joint (12), and the several installation joints (12) are connected to the reserved bolt holes on the machine tool tool holder slide.

6. The fixing device for screw turning according to claim 5, wherein The support frame (3) is provided with a reinforcing rod (10) at the bottom. One end of the reinforcing rod (10) is connected to the movable seat (1). A secondary rod (11) is threadedly connected to one side of the reinforcing rod (10). One end of the secondary rod (11) is connected to the outside of the fixing ring (4).

Images