A helical spline hole broaching machine

Abstract

The application discloses a helical spline hole broaching machine, and belongs to the technical field of broaching equipment, which comprises a rack, a workbench, a main slide plate, a broach clamping mechanism and a broach. The workbench is provided with a through hole, and the main slide plate drives the broach to vertically feed. In order to solve the problem that the free end of the broach is easy to swing in the long-stroke broaching condition, a follow-up supporting mechanism is additionally arranged on the machine, a connecting plate is fixed to the main slide plate and is provided with a vertical waist-shaped long circular hole, a pin shaft is slidably arranged in the waist-shaped long circular hole on the upper part of a transmission connecting rod, the workbench is provided with a connecting rod avoiding hole for the transmission connecting rod to pass through, the lower end of the transmission connecting rod is connected with a sliding seat, the sliding seat slides along a sliding seat guide rail, and a bearing on the sliding seat radially restricts the free end of the broach; the sliding seat is hung with a counterweight through a steel wire rope and a fixed pulley and is kept in tension and followed. The waist-shaped long circular hole is used to form a pre-feeding stroke, the follow-up supporting mechanism is followed synchronously after the broach passes through the workpiece, the cutting swing of the free end of the broach is inhibited, the forming precision of the helical spline hole is improved, and the workpiece yield is improved.

Description

Technical Field

[0001] This application relates to the field of broaching equipment technology, and in particular to a spiral spline hole broaching machine. Background Technology

[0002] Spiral spline holes are a type of through-hole structure with spiral teeth formed on the inner sidewall. They are widely used in mechanical transmission and precision fitting parts such as spline bushings, transmission connectors, and hydraulic valve bodies. They are mainly used to realize circumferential transmission, axial sliding, and angular compensation fit between components and are a key precision assembly structure in mechanical equipment.

[0003] Currently, in industrial production, vertical broaching machines are commonly used for the precision forming of helical spline holes. Vertical broaching machines offer advantages such as high machining accuracy, good forming consistency, and the ability to complete the overall hole shape in a single pass, making them suitable for batch processing of various high-precision helical spline holes. The conventional machining method involves fixing the workpiece to the broaching machine's worktable and keeping it stationary. The broach is fixed to the main slide via an upper clamping mechanism. The main slide drives the broach in a vertical feed motion, while a servo torsion mechanism simultaneously rotates the broach. Through this combined vertical feed and circumferential rotation cutting method, a continuous helical tooth structure is formed inside the workpiece in one pass, completing the overall machining of the helical spline hole.

[0004] For machining deep, long-stroke helical spline holes, the broach has a large vertical feed stroke. During machining, the broach body needs to completely penetrate the workpiece and descend as a whole to a position below the worktable. In such long-stroke broaching operations, the upper end of the broach is fixed and limited by a clamping mechanism, but the free end of the broach, far from the clamping end, is suspended in the air and lacks radial constraint. Under the combined influence of broaching cutting force, equipment vibration, and component assembly clearance, the free end of the broach is prone to slight wobbling and swinging. This wobbling phenomenon adversely affects the inner wall surface finish of the helical spline hole, the indexing accuracy of the tooth pattern, and the overall dimensional consistency, thus reducing the workpiece yield to some extent. Summary of the Invention

[0005] This application aims to provide a spiral spline hole broaching machine tool, which can reduce broach cutting wobbling and improve workpiece machining accuracy by following the radial limit of the broach end.

[0006] This application provides a spiral spline hole broaching machine, including a frame, a worktable, a main slide, a broach, and a broach clamping mechanism. The worktable is fixedly mounted on the frame and has a through hole. The main slide is vertically slidably mounted on the upper part of the frame. The broach clamping mechanism is fixedly mounted on the main slide, and the upper end of the broach is clamped and fixed on the broach clamping mechanism. The lower end of the broach can vertically pass through the through hole of the worktable and extend below the worktable. The broaching machine also has a follower support mechanism, which includes a connecting plate, a transmission link, a slide, and a slide guide rail. The slide guide rail is fixedly mounted on the frame and arranged below the worktable. The guide rail is slidably assembled; the connecting plate is fixedly installed on the main slide, and the connecting plate has a vertically arranged oblong hole; a pin is inserted through the upper part of the transmission connecting rod, and the pin is horizontally inserted into the oblong hole, forming a vertical sliding fit between the pin and the oblong hole; the worktable has a connecting rod clearance hole, the transmission connecting rod passes through the connecting rod clearance hole, and the lower end of the transmission connecting rod is fixedly connected to the slide; a bearing is installed on the upper end of the slide, and the free end of the drawbar can extend into the inner ring of the bearing; a pulley support is fixedly installed on the lower surface of the worktable, and a fixed pulley is installed on the pulley support; a steel wire rope is connected to the slide, the steel wire rope is wound around the fixed pulley, and a fixed counterweight is suspended from the free end of the steel wire rope.

[0007] Furthermore, a blocking plate is provided in the area above the oblong hole of the connecting plate, and the blocking plate is arranged laterally; the transmission connecting rod is provided with an extension section above the pin, and the spring is vertically sleeved outside the extension section, and the upper end of the spring can abut against the lower surface of the blocking plate.

[0008] Furthermore, a counterweight guide rail is vertically installed in the area below the workbench of the frame, and the counterweight block is slidably mounted on the counterweight guide rail.

[0009] Furthermore, the pulley support is connected to a rectangular protective frame, which is arranged around the fixed pulley, and the internal width of the rectangular protective frame is greater than the spacing of the wire ropes.

[0010] Furthermore, the inner ring of the bearing is fitted with a wear-resistant bushing.

[0011] Furthermore, the slide is equipped with an oil injection nozzle, which connects the sliding mating surface between the slide and the slide guide rail.

[0012] Furthermore, both the slide rail and the counterweight rail are coated with an anti-rust coating.

[0013] Beneficial technical effects

[0014] By setting a connecting plate with an oblong hole to form a pre-feed stroke linkage structure, during the downward movement of the main slide, after the broach passes through the workpiece, the connecting plate can drive the pin and transmission link to move the slide synchronously. The slide is continuously pulled by the counterweight structure to maintain tension and follow the state, so that the bearing continuously moves with the free end of the broach. At the same time, the bearing surrounds the free end of the broach to suppress the radial sway during the cutting of the long cantilever broach, thereby improving the machining accuracy of the spiral spline hole.

[0015] The buffer mechanism is formed by the cooperation of the baffle plate, the extension section and the spring. When the pin impacts the upper wall of the waist-shaped elongated hole, it achieves flexible contact, weakens the impact load, reduces the vibration of the whole machine, and extends the service life of the components.

[0016] By installing a rectangular protective frame on the outside of the fixed pulley to prevent the wire rope from slipping out of the rope groove, and by adding a wear-resistant bushing inside the bearing to reduce friction loss, the counterweight system and bearing can be kept running smoothly, thereby improving the reliability of the equipment. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the overall structure of the spiral spline hole broaching machine tool of this application;

[0019] Figure 2 This is a schematic diagram showing the state of the broach on the spiral spline hole broaching machine tool when the free end of the broach just contacts the upper end of the workpiece;

[0020] Figure 3 This is a schematic diagram showing the state of the broach on the spiral spline hole broaching machine tool when the free end of the broach just passes through the lower end of the workpiece.

[0021] Figure 4 This is a schematic diagram showing the completed broaching process of the spiral spline hole in this application.

[0022] Figure 5 This is a partial schematic diagram of the buffer structure in the follow-up support mechanism of this application;

[0023] Figure 6 This is a schematic diagram of the structure of the bearing with built-in wear-resistant bushing in this application;

[0024] Figure 7 An assembly diagram of a rectangular protective frame configured for the fixed pulley in this application.

[0025] Figure label:

[0026] 100. Workpiece

[0027] 1. Rack;

[0028] 2. Worktable; 21. Through hole; 22. Connecting rod clearance hole;

[0029] 3. Main slide;

[0030] 4. Tool clamping mechanism;

[0031] 5. Broach; 51. Free end of the broach;

[0032] 61. Connecting plate; 611. Oblong hole; 612. Blocking plate; 62. Transmission connecting rod; 621. Pin; 622. Extension section; 623. Spring; 63. Slide; 631. Bearing; 6311. Inner ring of bearing; 6312. Outer ring of bearing; 632. Wear-resistant bushing; 64. Slide guide rail;

[0033] 7. Pulley support; 71. Fixed pulley; 72. Rectangular protective frame;

[0034] 8. Steel wire rope;

[0035] 9. Counterweight; 91. Counterweight guide rail. Detailed Implementation

[0036] The technical solutions of the embodiments of this application will be described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments.

[0037] In embodiments of this application, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element.

[0038] In the embodiments of this application, unless otherwise explicitly specified and limited, the term "connection" should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral part; it can be a direct connection or an indirect connection through an intermediate medium.

[0039] Example 1

[0040] See Figure 1-2This embodiment provides a spiral spline hole broaching machine, including a frame 1, a worktable 2, a main slide 3, a broach 5, and a broach clamping mechanism 4; the worktable 2 is fixedly installed on the frame 1, and the worktable 2 has a through hole 21; the main slide 3 is vertically slidably installed on the upper part of the frame 1, the broach clamping mechanism 4 is fixedly assembled on the main slide 3, the upper end of the broach 5 is clamped and fixed on the broach clamping mechanism 4, and the lower end of the broach 5 can vertically penetrate the through hole 21 of the worktable 2 and extend below the worktable 2; the broaching machine also has a follower support mechanism, which includes a connecting plate 61, a transmission connecting rod 62, a slide 63, and a slide guide rail 64; the slide guide rail 64 is fixedly installed on the frame 1 and arranged below the worktable 2, and the slide 63 and the slide guide rail 64 are slidably assembled; the connecting plate 61 is fixedly installed on the frame 1, and arranged below the worktable 2; the slide 63 and the slide guide rail 64 are slidably assembled; the connecting plate 61 is fixedly installed on the frame 1, and arranged below the worktable 2; the main slide 63 and the slide guide rail 64 are slidably assembled; the connecting plate 61 is fixedly installed on the frame 1, and arranged below the worktable 2; the broach ... broach 64 is The main slide plate 3 is fixedly mounted, and the connecting plate 61 has a vertically arranged oblong hole 611. The upper part of the transmission connecting rod 62 is provided with a pin 621, which is horizontally installed in the oblong hole 611. The pin 621 and the oblong hole 611 form a vertical sliding fit. The worktable 2 has a connecting rod clearance hole 22, through which the transmission connecting rod 62 passes. The lower end of the transmission connecting rod 62 is fixedly connected to the slide 63. The upper end of the slide 63 is equipped with a bearing 631, and the free end 51 of the pulley 5 can extend into the inner ring 6311 of the bearing 631. The lower surface of the worktable 2 is fixedly provided with a pulley support 7, and a fixed pulley 71 is installed on the pulley support 7. The slide 63 is connected with a wire rope 8, which is wound around the fixed pulley 71. The free end of the wire rope 8 is suspended by a fixed counterweight 9.

[0041] In this embodiment, a vertical slide rail is provided on the upper part of the frame 1, and the main slide 3 is slidably mounted on the slide rail of the frame 1, providing a precise vertical sliding foundation for the main slide 3. As the core vertical moving component of the machine tool, the main slide 3's lifting power can be provided by a hydraulic drive system or a servo motor screw transmission system, achieving stable and uniform vertical feed motion. The broach clamping mechanism 4 is fixedly installed on the bottom surface of the main slide 3, which can firmly clamp and position the upper end of the broach 5, allowing the broach 5 to move up and down synchronously with the main slide 3, ensuring that the feed stroke of the broach 5 is consistent with the stroke of the main slide 3. The vertical sliding installation structure of the main slide 3 and the frame 1 is a conventional assembly structure for machine tools, and will not be described further in this embodiment.

[0042] See Figure 2-4During machining, the workpiece 100 is fixed to the upper surface of the worktable 2 and clamped by the machine tool's workpiece clamping structure to prevent the workpiece 100 from shifting, loosening, or shaking during machining, ensuring the stability of the workpiece 100's machining posture. A through-hole 21 is provided in the center of the worktable 2, directly opposite the machining hole of the workpiece 100, allowing the broach 5 to pass smoothly vertically through the workpiece 100. The machining logic is as follows: the workpiece 100 remains stationary throughout the process, relying on the downward feed of the broach 5, combined with its rotational motion, to complete the broaching of the helical spline hole; when the broach 5 has completely passed through the bottom of the workpiece 100 and fully exited the through-hole 21 of the worktable 2, the overall broaching process of the workpiece 100 is completed. Subsequently, the main slide 3 drives the broach 5 to rotate in the opposite direction and return vertically upwards, exiting the workpiece 100 according to the original machining path, thus completing the complete tool retraction process.

[0043] The connecting plate 61, serving as a transitional connecting component, can be securely fixed to the side or bottom wall of the main slide 3 by bolting or welding. It can rise and fall synchronously with the main slide 3 throughout its entire movement without relative displacement. The vertical length of the oblong hole 611 on the connecting plate 61 matches the pre-feed stroke of the broach 5. The pin 621 is inserted into and locked to the upper end of the transmission connecting rod 62, and can slide freely vertically within the oblong hole 611.

[0044] For example, the vertical length of the oblong hole 611 on the connecting plate 61 is equal to the distance from the free end of the broach to the upper surface of the workpiece 100 in the initial state, the thickness of the workpiece 100 itself, the thickness of the worktable 2, and the total distance of a small reserved distance for the free end of the broach 51 to extend into the inner ring 6311 of the bearing. This total distance is the pre-feed stroke. The free end of the broach does not need to extend completely into the inner ring 6311 of the bearing; it only needs to extend a set short distance to achieve radial limiting. The length of the oblong hole 611 can be adjusted by calculation according to the size of different specifications of the workpiece and the initial installation height of the broach 5 to adapt to various processing conditions.

[0045] In the initial state, the pin 621 is at the lowest position of the oblong hole 611. At this time, the downward movement of the connecting plate 61 will not immediately drive the transmission rod 62 to move, forming the pre-feed stroke range required for machining. During the pre-feed stroke stage of the downward machining of the broach 5, the pin 621 continues to slide in the oblong hole 611 until the free end 51 of the broach just extends out of the bottom end face of the workpiece 100, at which point the top inner wall of the oblong hole 611 just touches the pin 621. After that, the power for the main slide 3 to continue to feed downward is transmitted to the transmission rod 62 in sequence through the connecting plate 61, the top wall of the oblong hole 611, and the pin 621, which in turn drives the slide 63 to slide downward as a whole.

[0046] The lower end of the transmission link 62 and the slide 63 can be rigidly connected by bolts or welding to ensure that the transmission link 62 and the slide 63 move completely synchronously without any lag. The slide 63 slides vertically and smoothly along the slide guide rail 64, so that the bearing 631 at the upper end of the slide 63 always moves down synchronously with the free end 51 of the cutter. The bearing 631 and the free end 51 of the cutter remain relatively stationary, providing follow-up limiting support for the free end 51 of the cutter throughout the entire process.

[0047] See Figure 2 and Figure 6 For example, a circular mounting hole is provided on the upper part of the slide 63, and the bearing 631 is embedded in the circular mounting hole. The fixed connection between the outer ring 6312 of the bearing and the slide 63 can be achieved by interference fit, welding or fastener locking. For example, the free end 51 of the broach extends into the inner ring 6311 of the bearing a certain distance, for example, about 2-4mm, only for small depth insertion limit. Under normal conditions, the broach 5 and the inner ring 6311 of the bearing have a radial gap. When the broach 5 has a tendency to wobble radially, the outer wall of the broach 5 can contact the inner ring 6311 of the bearing to limit the wobble and suppress the wobble. Since the bearing 631 itself has the ability to rotate, when the broach 5 rotates circumferentially, if the broach 5 wobbles slightly and contacts the inner ring 6311 of the bearing, the inner ring 6311 of the bearing can rotate synchronously with the broach 5. This effectively avoids rigid dry friction between the outer wall of the broach 5 and the inner ring 6311 of the bearing, thereby reducing the probability of wear on the outer surface of the broach 5 while achieving radial anti-sway support.

[0048] Meanwhile, a counterweight structure is formed by a fixed pulley 71, a steel wire rope 8, and a counterweight 9 located below the workbench 2. The steel wire rope 8 is neatly housed inside the groove of the fixed pulley 71, completing reciprocating traction motion along the groove trajectory. In the normal standby state of the equipment, without any downward driving force applied, the counterweight 9 continuously pulls the steel wire rope 8 by its own weight, ensuring that the entire follow-up support mechanism, including the slide 63 and the transmission link 62, is always subjected to a constant upward tension to achieve balance. This tension can completely offset the weight of the slide 63, the transmission link 62, and other components, effectively preventing the entire follow-up support mechanism from sliding down or falling due to its own weight, keeping the mechanism stable in its initial standby position. The entire mechanism only moves downward synchronously with the pulley 5 when the connecting plate 61 above applies a downward driving force to the pin 621 through the oblong hole 611, improving the stability and precision of the mechanism's operation.

[0049] For example, the connecting plate 61, the transmission link 62 and the link clearance hole 22 can all be arranged symmetrically relative to the workpiece 100. The two transmission links 62 on both sides are respectively connected to the two ends of the slide block 63. The slide block guide rail 64 and the counterweight structure matched with the slide block 63 are also symmetrically arranged, so that the slide block 63 is subjected to uniform force and the running movement is more stable.

[0050] This embodiment incorporates a follow-up support mechanism for long-stroke helical spline hole broaching. This mechanism continuously provides radial constraint on the free end 51 of the broach during the feed stroke after the broach 5 has passed through the workpiece 100. This effectively mitigates the slight wobbling of the long cantilever broach 5 caused by cutting vibration and assembly clearance, reducing the negative impact of tool body wobbling on hole accuracy and tooth texture uniformity. It improves the forming accuracy and surface finish of the helical spline hole, stabilizing the machining quality and yield of the workpiece 100.

[0051] Example 2

[0052] See Figure 2 and Figure 5 The connecting plate 61 has a blocking plate 612 in the area above the waist-shaped elongated hole 611, and the blocking plate 612 extends laterally; the transmission connecting rod 62 has an extension section 622 above the pin 621, and the spring 623 is vertically sleeved on the outside of the extension section 622, and the upper end of the spring 623 can abut against the lower surface of the blocking plate 612.

[0053] In this embodiment, the baffle plate 612 can be fixedly installed above the oblong hole 611 of the connecting plate 61 by bolt connection or welding. It can move vertically synchronously with the connecting plate 61. The spring 623 is sleeved vertically outside the extension section 622, and the lower end of the spring 623 abuts against the pin 621. In the initial working condition of the equipment, the pin 621 is at the bottom of the oblong hole 611, and the upper end of the spring 623 does not contact the lower surface of the baffle plate 612. As the main slide plate 3 continues to move downward, the natural length of the spring 623 is approximately equal to the distance between the pin 621 and the baffle plate 612 when the pin 621 reaches the upper wall of the oblong hole 611. At the moment when the pin 621 abuts against the upper wall of the oblong hole 611, the spring 623 just contacts the lower surface of the baffle plate 612 and generates a slight compression synchronously, realizing impact buffering. As the connecting plate 61 continues to descend, the spring 623 remains slightly compressed, thus providing flexible buffering and preventing direct rigid impact between the pin 621 and the connecting plate 61. During the continuous descent phase, the spring 623 remains slightly compressed, generating a small elastic force that has limited impact on the balance of the counterweight 9. Even if the spring force of 623 causes a minor force effect, this deviation can be offset by adjusting the weight of the counterweight 9, without interfering with the normal operation of the entire servo support mechanism.

[0054] The baffle plate 612, the extension section 622, and the spring 623 together constitute a buffer mechanism. This buffer structure forms a flexible transition before the pin 621 contacts the upper wall of the oblong hole 611, which can reduce the impact generated at the moment of contact and slow down the wear caused by long-term reciprocating collisions of the parts. It helps to reduce the vibration of the mechanism, improve the smoothness of the transmission process, help maintain the positional stability of the broach 5 at the radial limit, and improve the machining conditions.

[0055] Example 3

[0056] See Figure 2-4 A counterweight guide rail 91 is vertically installed in the area below the workbench 2 of the frame 1, and the counterweight block 9 is slidably mounted on the counterweight guide rail 91.

[0057] In this embodiment, the counterweight guide rail 91 is vertically arranged in the frame 1 area below the workbench 2. The upper part of the counterweight guide rail 91 can be connected to the bottom surface of the workbench 2, and the middle and lower parts of the counterweight guide rail 91 are fixedly installed on the frame 1. The counterweight block 9 is provided with a locking guide structure adapted to the counterweight guide rail 91. The locking guide structure can be a groove or a guide buckle. The locking guide structure and the counterweight guide rail 91 lock together, so that the counterweight block 9 can only slide vertically along the counterweight guide rail 91, limiting the horizontal offset and sway of the counterweight block 9. The counterweight block 9 is pulled by the steel wire rope 8 and moves up and down synchronously with the slide block 63. The counterweight guide rail 91 continuously constrains the running trajectory of the counterweight block 9, preventing the counterweight block 9 from swaying or twisting left and right during the lifting and lowering process.

[0058] By adding a counterweight guide rail 91 to constrain the movement of the counterweight 9, it is possible to prevent swaying and deviation during the lifting and lowering of the counterweight 9, reduce the additional off-center load on the wire rope 8, and reduce the vibration caused by the swaying of the wire rope 8. This ensures the stability of the traction force direction of the counterweight 9, makes the force on the follow-up support mechanism more stable, and improves the reliability of the entire device during operation.

[0059] Example 4

[0060] See Figure 2 and Figure 7 The pulley support 7 is connected to a rectangular protective frame 72, which is arranged around the fixed pulley 71. The internal width of the rectangular protective frame 72 is greater than the spacing of the wire ropes 8.

[0061] In this embodiment, the rectangular protective frame 72 is a regular rectangular frame structure, which can be centrally fixed to the center position of the pulley support 7 by screw fastening, and is arranged around the outside of the fixed pulley 71. For example, the internal width of the rectangular protective frame 72 refers to its distance along the radial direction of the fixed pulley and corresponding to the wire rope arrangement direction. The internal width of the rectangular protective frame 72 is slightly larger than the working arrangement spacing of the wire rope 8, which can form an outer protective limit on the mating area of ​​the wire rope 8 and the fixed pulley 71 without interfering with the normal winding and sliding transmission of the wire rope 8. This can effectively prevent the wire rope 8 from dislodging from the pulley groove due to equipment vibration, improve the stability and safety of the wire rope 8 transmission operation, reduce the probability of equipment failure, and facilitate the long-term stable operation of the mechanism.

[0062] Example 5

[0063] See Figure 2 and Figure 6 The inner ring of the bearing 6311 is fitted with a wear-resistant bushing 632.

[0064] The wear-resistant bushing 632 can be interference-fitted into the inner wall of the bearing inner ring 6311. The wear-resistant bushing 632 can be made of low-friction soft wear-resistant materials such as polyurethane and polytetrafluoroethylene. When the free end 51 of the broach shakes and comes into contact with the wear-resistant bushing 632, the soft wear-resistant bushing 632 can buffer the contact stress, reduce the wear degree between the outer wall of the broach 5 and the inner ring 6311 of the bearing, and extend the service life of the bearing 631 and the broach 5.

[0065] Example 6

[0066] The slide block 63 is provided with an oil injection nozzle, which connects the sliding mating surface between the slide block 63 and the slide block guide rail 64.

[0067] In this embodiment, the slide block 63 has a connected oil channel inside. The grease nipple is fixedly installed on the outside of the slide block 63 and communicates with the internal oil channel. The internal oil channel can directly lead to the sliding contact surface between the slide block 63 and the slide block guide rail 64. The grease nipple is a conventional component in the art, and its specific structure will not be described in detail here. The operator can add lubricating oil to the inside of the oil channel through the grease nipple. The lubricating oil evenly penetrates between the sliding contact surfaces through the oil channel, which can continuously lubricate the sliding pair, effectively reduce the sliding friction resistance between the slide block 63 and the slide block guide rail 64, avoid wear and jamming of components caused by long-term dry friction, ensure smooth and stable reciprocating sliding of the slide block 63, and improve the overall smoothness and service life of the mechanism.

[0068] In some optional embodiments, the counterweight 9 is also provided with an oil injection nozzle, which connects the sliding mating surface between the counterweight 9 and the counterweight guide rail 91.

[0069] Example 7

[0070] Both the slide rail 64 and the counterweight rail 91 have an anti-rust coating on their surfaces.

[0071] The surface of the two guide rails can be treated with conventional metal anti-rust coating processes such as galvanizing and chrome plating. The anti-rust coating isolates the guide rails from air and moisture, preventing them from rusting and developing rust spots in the humid workshop environment. This not only extends the service life of the guide rails but also maintains the smoothness of the guide rail surface, ensuring that the sliding of the slide block 63 and the counterweight 9 is smooth and unobstructed, and that there is little chance of jamming or obstruction.

[0072] In the description of the embodiments of this application, specific features, structures, materials or characteristics may be combined in any suitable manner in one or more embodiments or examples.

[0073] The above are merely specific embodiments of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A spiral spline hole broaching machine, comprising a frame, a worktable, a main slide, a broach and a broach clamping mechanism; The worktable is fixedly mounted on the frame, and the worktable has through holes for cutting. The main slide is vertically slidably mounted on the upper part of the frame. The broach clamping mechanism is fixedly assembled on the main slide. The upper end of the broach is clamped and fixed on the broach clamping mechanism. The lower end of the broach can vertically penetrate the through hole of the worktable and extend to the bottom of the worktable. Its features are: The broaching machine tool is also provided with a follower support mechanism, which includes a connecting plate, a transmission link, a slide, and a slide guide rail; the slide guide rail is fixedly installed on the machine frame and arranged below the worktable, and the slide and the slide guide rail are slidably assembled. The connecting plate is fixedly installed on the main slide plate, and the connecting plate has a vertically arranged oblong hole; a pin is passed through the upper part of the transmission connecting rod, and the pin is horizontally inserted into the oblong hole, and the pin and the oblong hole form a vertical sliding fit. The worktable has a connecting rod clearance hole, the transmission connecting rod passes through the connecting rod clearance hole, and the lower end of the transmission connecting rod is fixedly connected to the slide. The upper end of the slide is equipped with a bearing, and the free end of the broach can extend into the inner ring of the bearing. A pulley support is fixedly provided on the lower surface of the workbench, and a fixed pulley is installed on the pulley support; The slide is connected to a steel wire rope, which is wound around the fixed pulley, and a fixed counterweight is suspended from the free end of the steel wire rope.

2. The spiral spline hole broaching machine tool according to claim 1, characterized in that: The connecting plate has a blocking plate in the area above the oblong hole, and the blocking plate extends laterally; the transmission link has an extension section above the pin, and a spring is vertically sleeved outside the extension section, and the upper end of the spring can abut against the lower surface of the blocking plate.

3. The spiral spline hole broaching machine tool according to claim 1, characterized in that: A counterweight guide rail is vertically arranged in the area of ​​the frame located below the workbench, and the counterweight block is slidably mounted on the counterweight guide rail.

4. The spiral spline hole broaching machine tool according to claim 1, characterized in that: The pulley support is connected to a rectangular protective frame, which is arranged around the fixed pulley. The internal width of the rectangular protective frame is greater than the spacing of the steel wire ropes.

5. A spiral spline hole broaching machine tool according to claim 1, characterized in that: The bearing inner ring is fitted with a wear-resistant bushing.

6. A spiral spline hole broaching machine tool according to claim 1, characterized in that: The slide block is provided with an oil injection nozzle, which is connected to the sliding mating surface between the slide block and the slide block guide rail.

7. A spiral spline hole broaching machine tool according to claim 3, characterized in that: Both the slide rail and the counterweight rail have an anti-rust coating on their surfaces.

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