Precise gear hobbing machine

Abstract

The invention relates to the technical field of gear machining, and discloses a precise gear hobbing machine which comprises a base used for supporting, a hob assembly used for machining and an electric guide rail used for driving a workpiece to move, the hob assembly is fixedly installed on one side of the upper end of the base, and the electric guide rail is fixedly installed on the other side of the upper end of the base. The device integrates the pressing assembly, the end face detection assembly and the side wall detection assembly, full automation of workpiece clamping and detection is achieved, the pressing assembly automatically corrects and locks the center of a workpiece while providing reliable clamping force through the dual functions of axial pressing and radial holding, the end face detection assembly drives the carrying disc to drive the workpiece to rotate, and the workpiece clamping and detecting efficiency is improved. The side wall detection assembly synchronously measures the radial run-out of the outer circle of the workpiece and evaluates the centering precision, all the assemblies work cooperatively, the detection of the positioning quality of the workpiece is automatically and rapidly completed before machining, the clamping deviation is fundamentally eliminated, and the machining precision, stability and production efficiency are remarkably improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of gear machining, in particular to a precision gear hobbing machine. BACKGROUND

[0002] As a classic gear machining machine tool, the gear hobbing machine is widely used for cutting and forming various cylindrical gears, helical gears and worm gears. Its machining principle is based on the generating method. The continuous meshing movement between the hob and the workpiece envelopes the gear tooth profile. Specifically, the hob is usually installed on a high-speed rotating spindle to form the main cutting movement. The workpiece is installed on the spindle or clamp and driven by the indexing mechanism for precise rotational movement to ensure that the hob turns one pitch and the workpiece turns one tooth slot angle, thereby gradually cutting out the complete tooth profile.

[0003] At present, the gear hobbing machine is mostly manually placed by the operator when fixing the workpiece on the worktable or spindle, and fixed by bolts, pressure plates or simple clamping mechanisms. The positioning and clamping during the clamping process rely on the manual experience of the operator. The positioning accuracy after clamping lacks in-situ and rapid verification methods. Usually, after fixing is completed, the worker needs to additionally install a micrometer and manually rotate the workbench to detect the concentricity of the workpiece, which not only significantly increases the auxiliary time of non-processing, resulting in low processing efficiency, but also because of the subjectivity and sampling of manual operation, part of the clamping deviation is not identified in time, which eventually amplifies the error in the finishing process, causing the workpiece to be out of tolerance or even scrapped, which seriously restricts the improvement of production precision and efficiency. Therefore, we propose a precision gear hobbing machine. SUMMARY

[0004] The purpose of the present application is to provide a precision gear hobbing machine to solve the problems raised in the background art.

[0005] To achieve the above purpose, the present application provides the following technical scheme: a precision gear hobbing machine, comprising a base for supporting, a hobbing tool assembly for machining and an electric guide rail for moving the workpiece, the hobbing tool assembly is fixedly installed on one side of the upper end of the base, the electric guide rail is fixedly installed on the other side of the upper end of the base, a moving frame is installed on the upper end of the electric guide rail, a workpiece rotating assembly is installed in the moving frame, a load plate is fixedly connected to the output end of the workpiece rotating assembly, a pressing assembly for fixing the workpiece is installed on the upper end of the moving frame, an end face detection assembly for testing the flatness of the workpiece is installed on the upper end of the load plate, a worktable is fixedly installed on the upper end of the end face detection assembly, a positioning cylinder is fixedly connected to the upper end of the worktable, the pressing assembly is arranged in the positioning cylinder, and a side wall detection assembly for centering measurement of the workpiece is installed on the side of the moving frame close to the hobbing tool assembly.

[0006] Preferably, the pressing assembly comprises a hydraulic cylinder and a plurality of sliding openings, the hydraulic cylinder is fixedly connected to the upper end of the moving frame, the sliding openings are arranged in an annular array, and the sliding openings are arranged on the inner wall of the positioning cylinder and extend to the outside and communicate with the outside.

[0007] Preferably, the top of the inner wall of the limiting frame is fixedly connected with a top rod, the top rod is opposite to the center of the positioning cylinder, the inner wall of the sliding opening is provided with a limiting assembly for extruding and fixing the inner wall of the workpiece, the limiting assembly comprises a sliding groove, the sliding groove is provided with two sliding grooves, the sliding grooves are symmetrically arranged on both sides of the sliding opening, the sliding grooves are slidably connected with a moving plate, and the moving plate is fixedly connected with a wedge-shaped sliding block on one side.

[0008] Preferably, the wedge-shaped sliding block is slidably arranged in the positioning cylinder, the inner wall of the sliding groove is fixedly connected with a group of limiting springs, one end of the limiting spring is fixedly connected to one side of the moving plate, the side of the moving plate away from the wedge-shaped sliding block is fixedly connected with a limiting block, and the end of the limiting block away from the wedge-shaped sliding block is arranged in an arc shape.

[0009] Preferably, the end face detection assembly comprises a plurality of telescopic rods, a plurality of reset springs, a support column and a lifting cylinder, the telescopic rods and the reset springs are arranged in an annular array, the telescopic rods and the reset springs are fixedly connected to the upper end of the bearing plate, the reset springs are arranged in an annular array, the telescopic rods are respectively arranged in the reset springs, the support column is fixedly connected to the center of the upper end of the bearing plate, and the lifting cylinder is fixedly connected to the center of the lower end of the bearing plate.

[0010] Preferably, the upper end of the telescopic rod and the reset spring is fixedly connected with a lifting plate, the lifting plate is rotatably arranged at the lower part of the outside of the lifting cylinder, the inner wall of the lifting cylinder is fixedly connected with a guide ball, the outside of the support column is provided with a spiral guide groove, the guide ball is slidably connected in the spiral guide groove, the outer wall of the lifting plate is fixedly connected with a first mounting frame, the first mounting frame is fixedly connected with a first micrometer on one side, and the detection end of the first micrometer is vertically upward.

[0011] Preferably, the side wall detection assembly comprises a guide rail, a vertical rod and a connecting sleeve, the guide rail is fixedly connected to one side of the moving frame, the vertical rod is fixedly connected to one side of the upper end of the moving frame, the connecting sleeve is rotatably arranged at the middle part of the outside of the lifting cylinder, the outside of the guide rail is slidably connected with a lifting rod, and one end of the lifting rod is fixedly connected to the outside of the lifting cylinder.

[0012] Preferably, the lifting rod upper end is provided with a moving groove, the inner wall of the moving groove is rotationally connected with a one-way screw rod, the moving groove is slidably connected with a second mounting frame, the one-way screw rod penetrates the second mounting frame, and the second mounting frame and the one-way screw rod are externally threadedly connected.

[0013] Preferably, the second mounting frame upper end is fixedly connected with a second micrometer, the lifting rod one side is rotationally connected with a straight gear, the vertical rod upper end is fixedly connected with two racks, the meshing teeth of the two racks are arranged in an up-down staggered manner, and the two racks are mutually engaged with the straight gear.

[0014] Preferably, the base upper end is fixedly connected with two symmetrically arranged fixing rods, the upper part between the two fixing rods is commonly fixedly connected with an electromagnetic roller, and the base lower end four corners are all fixedly connected with universal wheels and electric legs.

[0015] Compared with the prior art, the present application has the following beneficial effects: The present application integrates the pressing assembly, the end face detection assembly and the side wall detection assembly, forms a high-precision machining gear rolling machine integrating automatic positioning, stable clamping and in-situ detection, uses the pressing assembly to implement axial pressing and radial extrusion of the workpiece, not only reliably clamps, but also automatically corrects and locks the workpiece at the center position of the object carrier, realizes high-precision automatic centering, the end face detection assembly can drive the object carrier to rotate after the workpiece is fixed, automatically detects the flatness of the workpiece, ensures that the workpiece reference surface meets the machining requirements, at the same time, the side wall detection assembly can simultaneously measure the centering of the workpiece outer circle and detect the radial runout of the workpiece, thereby judging the installation accuracy of the workpiece, the components of the device are closely matched, the positioning quality of the workpiece can be automatically and quickly verified before machining, manual detection is not needed, thereby eliminating the machining error caused by clamping deviation, and the precision stability, consistency and production efficiency of the device machining are significantly improved. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 It is a schematic view of the main structure of the present application; Figure 2 It is a rear view of the main structure of the present application; Figure 3 It is another view of the main structure of the present application; Figure 4 It is a schematic view of the moving frame structure of the present application; Figure 5 It is a schematic view of the pressing assembly structure of the present application; Figure 6 It is a schematic view of the spiral guide groove structure of the present application; Figure 7 It is a sectional view of the lifting cylinder structure of the present application; Figure 8 Schematic view of the guide ball and the first micrometer structure of the present application; Figure 9 Schematic view of the straight gear and rack structure of the present application; Figure 10 Schematic view of the one-way screw structure of the present application.

[0017] In the figure: 1, base; 2, hob assembly; 3, electric guide rail; 4, moving frame; 5, workpiece rotating assembly; 6, bearing plate; 7, pressing assembly; 701, hydraulic cylinder; 702, sliding port; 703, limiting frame; 704, ejector rod; 705, sliding groove; 706, moving plate; 707, wedge-shaped sliding block; 708, limiting spring; 709, limiting block; 8, end face detection assembly; 801, telescopic rod; 802, return spring; 803, support column; 804, lifting cylinder; 805, lifting plate; 806, guide ball; 807, helical guide groove; 808, first mounting frame; 809, first micrometer; 9, object carrier; 10, positioning cylinder; 11, side wall detection assembly; 1101, guide rail; 1102, vertical rod; 1103, connecting sleeve; 1104, lifting rod; 1105, moving groove; 1106, one-way screw; 1107, second mounting frame; 1108, second micrometer; 1109, straight gear; 1110, rack; 12, fixed rod; 13, electromagnetic roller; 14, universal wheel; 15, electric support leg. DETAILED DESCRIPTION

[0018] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without creative work fall within the protection scope of the present application.

[0019] Please refer to Figures 1-10As shown, the present application provides a technical solution: a precision hobbing machine, comprising a base 1 for supporting, a hobbing cutter assembly 2 for machining and an electric guide rail 3 for moving the workpiece, the hobbing cutter assembly 2 is fixedly installed at one side of the upper end of the base 1, the electric guide rail 3 is fixedly installed at the other side of the upper end of the base 1, the upper end of the electric guide rail 3 is installed with a moving frame 4, the moving frame 4 is installed with a workpiece rotating assembly 5, the output end of the workpiece rotating assembly 5 is fixedly connected with a bearing plate 6, the upper end of the moving frame 4 is installed with a pressing assembly 7 for fixing the workpiece, the upper end of the bearing plate 6 is installed with an end face detection assembly 8 for testing the flatness of the workpiece, the upper end of the end face detection assembly 8 is fixedly installed with a carrier 9, the upper end of the carrier 9 is fixedly connected with a positioning cylinder 10, the pressing assembly 7 is arranged in the positioning cylinder 10, and the side of the moving frame 4 close to the hobbing cutter assembly 2 is installed with a side wall detection assembly 11 for centering measurement of the workpiece.

[0020] Further, by integrating the pressing assembly 7, the end face detection assembly 8 and the side wall detection assembly 11, a high-precision machining hobbing machine with automatic positioning, stable clamping and in-situ detection is formed. The pressing assembly 7 is used to axially press and radially extrude the workpiece, which not only ensures reliable clamping force, but also automatically corrects and locks the workpiece at the center position of the carrier 9, achieving high-precision automatic centering. Secondly, the end face detection assembly 8 can drive the carrier 9 to rotate after the workpiece is fixed, automatically detect the flatness of the workpiece installation, and ensure that the workpiece reference surface meets the machining requirements. At the same time, the side wall detection assembly 11 can simultaneously measure the centering of the workpiece outer circle and detect the radial runout of the workpiece, so as to judge the installation accuracy of the workpiece. The components of the device cooperate closely, which can automatically and quickly verify and ensure the positioning quality of the workpiece before machining, without manual detection, thereby eliminating the machining errors caused by clamping deviation, and significantly improving the precision stability, consistency and production efficiency of the device.

[0021] It should be noted that the hob assembly 2, the electric guide rail 3 and the workpiece rotating assembly 5 are all prior art, the hob assembly 2 is composed of a precision spindle, a hob mounted at the front end of the spindle, and a motor and a transmission system for driving the spindle to rotate at high speed, in the machining process, the hob spindle is driven by the motor to rotate at high speed to form a main cutting motion, the rotating axis thereof is installed at a certain angle with the workpiece axis, through continuous generating cutting motion, all the teeth are gradually cut out on the rotating blank workpiece, the electric guide rail 3 is responsible for accurately controlling the relative position between the workpiece and the hob assembly 2, including a guide rail base body, a slider sliding accurately along the guide rail, and a stepping motor providing power, the motor drives a set of precision ball screw pair through a coupling to convert the rotary motion of the motor into the linear motion of the slider, so as to send the workpiece to the machining area or transfer between different workstations, and the depth and stroke of cutting can be accurately controlled, the workpiece rotating assembly 5 is a mechanism for installing and driving the workpiece to be machined to rotate by indexing, including a numerical control indexing motor as a power source, a high-precision reduction mechanism to increase torque and improve indexing accuracy, the motor receives indexing instructions to perform accurate angular displacement, and drives the workpiece spindle to perform intermittent or continuous rotary motion through the reduction mechanism, this rotary motion must be strictly synchronized with the main cutting motion of the hob assembly 2 to ensure that the hob rotates one revolution and the workpiece rotates a pitch angle accordingly, so as to correctly envelope the involute tooth profile of the gear, which will not be described here.

[0022] In the preferred technical solution of the embodiment, referring to Figures 1-5 As shown in the figure, the pressing assembly 7 includes a hydraulic cylinder 701 and a plurality of sliding ports 702, the hydraulic cylinder 701 is fixedly connected to the upper end of the moving frame 4, the sliding ports 702 are arranged in a ring array, the sliding ports 702 are opened in the inner wall of the positioning cylinder 10 near the lower part, and the sliding ports 702 extend to the outside and communicate with the outside, the output end of the hydraulic cylinder 701 penetrates the moving frame 4, and the output end of the hydraulic cylinder 701 is rotationally connected to a limiting frame 703.

[0023] Further, after the workpiece is sleeved outside the positioning cylinder 10 and placed above the object carrier 9, the hydraulic cylinder 701 fixed to the upper end of the moving frame 4 drives the output end to move downward, pushing the limiting frame 703 rotationally connected thereto to press downward, since the lower end of the limiting frame 703 is arranged in a ring shape, during the descending process of the limiting frame 703, the positioning cylinder 10 will move to the inside of the limiting frame 703, and the limiting frame 703 itself will finally exert an axial pressing force on the upper surface of the workpiece, thereby achieving the pressing and fixing of the workpiece.

[0024] In the preferred technical solution of the embodiment, referring to Figure 5As shown, the inner wall of the limiting frame 703 is fixedly connected with a top rod 704 at the center of the top, the top rod 704 is opposite to the center of the positioning cylinder 10, a plurality of sliding openings 702 are provided with a limiting assembly for extruding and fixing the inner wall of the workpiece, the limiting assembly comprises a sliding groove 705, the sliding groove 705 is provided with two, the two sliding grooves 705 are symmetrically arranged on the two sides of the sliding opening 702, and a moving plate 706 is slidably connected in the two sliding grooves 705; the one side of the moving plate 706 is fixedly connected with a wedge-shaped sliding block 707; The wedge-shaped sliding block 707 is slidably arranged in the positioning cylinder 10, the inner wall of the two sliding grooves 705 is fixedly connected with a group of limiting springs 708, one end of the two groups of limiting springs 708 is fixedly connected to the one side of the moving plate 706, the middle of the side of the moving plate 706 away from the wedge-shaped sliding block 707 is fixedly connected with a limiting block 709, and the end of the limiting block 709 away from the wedge-shaped sliding block 707 is arc-shaped.

[0025] Further, when the hydraulic cylinder 701 drives the limiting frame 703 to press down, the top rod 704 fixed to the center of the limiting frame 703 moves downward, the end of the top rod 704 extrudes the inner inclined surface of the wedge-shaped sliding block 707, converts the axial driving force into radial expansion force, pushes the moving plate 706 to overcome the elastic force of the limiting spring 708, the limiting springs 708 are arranged in groups, and the moving plate 706 stably slides outward along the sliding grooves 705 symmetrically arranged on the two sides of the sliding opening 702, so that the limiting block 709 fixed to the moving plate 706 is finally driven to radially extend, the limiting block 709 uniformly extrudes and fixes the inner wall of the workpiece, the inclined surface mechanism of the top rod 704 and the wedge-shaped sliding block 707 efficiently and synchronously drives the annular array of limiting units, ensures the automatic centering and high-precision clamping of the workpiece, the symmetrical sliding grooves 705 ensure the stability and guiding accuracy of the movement of the moving plate 706, and the limiting spring 708 provides a reliable reset mechanism to ensure that the limiting block 709 can automatically retract when the top rod 704 rises, and the arc-shaped arrangement of the end of the limiting block 709 further optimizes the contact with the inner wall of the workpiece, realizes uniform stress and lossless clamping.

[0026] In the preferred technical solution of the embodiment, please refer to Figures 6-8 As shown, the end face detection assembly 8 comprises a telescopic rod 801, a reset spring 802, a support column 803 and a lifting cylinder 804, the telescopic rod 801 and the reset spring 802 are provided in plurality, the plurality of telescopic rods 801 and the plurality of reset springs 802 are fixedly connected to the upper end of the bearing plate 6, the plurality of reset springs 802 are arranged in an annular array, the plurality of telescopic rods 801 are respectively sleeved in the plurality of reset springs 802, the support column 803 is fixedly connected to the center of the upper end of the bearing plate 6, and the lifting cylinder 804 is fixedly connected to the center of the lower end of the bearing plate 6; A lifting plate 805 is fixedly connected to the upper ends of multiple telescopic rods 801 and multiple return springs 802. The lifting plate 805 is rotatably sleeved on the lower part of the outside of the lifting cylinder 804. A guide ball 806 is fixedly connected to the lower part of the inner wall of the lifting cylinder 804. A spiral guide groove 807 is opened on the outside of the support column 803. The guide ball 806 is slidably connected in the spiral guide groove 807. A first mounting bracket 808 is fixedly connected to the outer wall of the lifting plate 805. A first dial indicator 809 is fixedly connected to one side of the first mounting bracket 808. The detection end of the first dial indicator 809 is vertically upward.

[0027] Furthermore, when the workpiece is pressed down by the pressing assembly 7, the downward pressure is transmitted to the lifting plate 805 through the carrying tray 9, forcing multiple return springs 802 to compress and driving the lifting plate 805 and the lifting cylinder 804 fixed thereon to move downward along the support column 803. During this process, the guide ball 806 fixed to the inner wall of the lifting cylinder 804 slides along the spiral guide groove 807 on the outside of the support column 803, converting the vertical linear motion into precise rotational motion. The spiral guide groove 807 is provided with multiple turns, thereby driving the entire lifting plate 805 and the carrying tray 9 to rotate at a uniform speed while descending. Since the lifting plate 805 is rotated and sleeved outside the lifting cylinder 804, and the lifting plate 805 is limited by the telescopic rod 801, therefore... The lifting plate 805 only moves downward, while the lifting cylinder 804 rotates inside the lifting plate 805. The first mounting bracket 808 and the first dial indicator 809, which are fixed on the lifting plate 805, are different. The workpiece located on the loading plate 9 will rotate, so that the vertically upward detection end of the first dial indicator 809 will perform a rotary scanning detection on the lower end face of the workpiece. The clamping pressure is converted into the rotary scanning motion required for detection, realizing the automated in-situ detection of the flatness of the workpiece installation. It can efficiently and intuitively identify the flatness error of the workpiece installation, greatly improving the detection efficiency and the quality assurance capability before processing. After processing is completed, the pressing component 7 rises, the reset spring 802 loses its pressure restriction, and the whole device can be slowly reset.

[0028] In the preferred embodiment of this technical solution, please refer to Figure 2 , Figure 9 and Figure 10 As shown, the side wall detection assembly 11 includes a guide rail 1101, a vertical rod 1102, and a connecting sleeve 1103. The guide rail 1101 is fixedly connected to one side of the movable frame 4, the vertical rod 1102 is fixedly connected to one side of the upper end of the movable frame 4, and the connecting sleeve 1103 is rotatably sleeved on the middle of the outside of the lifting cylinder 804. A lifting rod 1104 is slidably connected to the outside of the guide rail 1101, and one end of the lifting rod 1104 is fixedly connected to the outside of the lifting cylinder 804. The upper end of the lifting rod 1104 is provided with a moving groove 1105. A one-way screw 1106 is rotatably connected to the inner wall of the moving groove 1105. A second mounting bracket 1107 is slidably connected inside the moving groove 1105. The one-way screw 1106 passes through the second mounting bracket 1107, and the second mounting bracket 1107 and the one-way screw 1106 are externally threaded together. The second mounting bracket 1107 is fixedly connected to the upper end of the second dial indicator 1108. The lifting rod 1104 is rotatably connected to one side of the spur gear 1109. The upper end of the upright rod 1102 is fixedly connected to two racks 1110. The teeth of the two racks 1110 are staggered vertically, and both racks 1110 mesh with the spur gear 1109.

[0029] Furthermore, when the lifting cylinder 804 of the end face detection assembly 8 lowers the workpiece, the connecting sleeve 1103 fixed to its outside synchronously drives the lifting rod 1104 to slide down along the guide rail 1101. During the descent, the spur gear 1109 installed on one side of the lifting rod 1104 meshes with the first misaligned rack 1110 fixed to the upper end of the upright rod 1102 and rotates, thereby driving the one-way screw 1106 linked with it to rotate. Since the second mounting bracket 1107 is threadedly connected to the one-way screw 1106 and slides in the moving groove 1105, it carries the second dial indicator 1108 smoothly towards the outer circle of the workpiece and contacts the outer wall of the workpiece. Subsequently, the first misaligned rack 1110 disengages from the spur gear 1109. At this point, the second dial indicator 1108 makes stable contact with the outside of the workpiece. As the lifting cylinder 804 continues to descend and the workpiece continues to rotate, the detection end of the second dial indicator 1108 detects the radial runout of the workpiece. After the workpiece rotates several times, the detection is completed. The spur gear 1109 meshes with the second misaligned rack 1110, driving the one-way screw 1106 to reverse, thereby causing the second dial indicator 1108 to automatically retract. Through linkage with the workpiece descent, the entire process of feeding, detecting, and retracting the second dial indicator 1108 is automatically completed, realizing automated in-situ measurement of workpiece centering accuracy. At the same time, it can effectively avoid damage to the second dial indicator 1108 in subsequent processing, ensuring equipment safety and detection efficiency.

[0030] It should be noted that both the first dial indicator 809 and the second dial indicator 1108 are existing technologies. Internally, they consist of an oscillator, a detection coil, and a signal processing circuit. When the probe contacts the surface being measured and undergoes displacement, it causes a change in the electromagnetic induction of the coil or a movement of the grating moiré fringes. This change is converted into a proportional electrical signal by the circuit, and then converted into a digital reading by an analog-to-digital converter. Furthermore, the digital display dial indicator usually has a built-in or external data output interface, and the real-time digital detection data is continuously or triggered to be transmitted to a host computer, thereby realizing the digitization and visualization of the detection data. This will not be elaborated further here. Also, since the first dial indicator 809 is located on the inner side below the workpiece, the processing position is far from the processing area during processing, so it does not need to be retracted.

[0031] In the preferred embodiment of this technical solution, please refer to Figures 1-3 As shown, two symmetrically arranged fixing rods 12 are fixedly connected to the upper end of the base 1. An electromagnetic roller 13 is fixedly connected between the two fixing rods 12 at the upper part. Universal wheels 14 and electric support legs 15 are fixedly connected to the four corners of the lower end of the base 1.

[0032] Furthermore, two symmetrical fixed rods 12 fixedly connected to the upper end of the base 1 jointly support an electromagnetic roller 13. During processing, the electromagnetic roller 13 is energized to generate a magnetic field, which is used to automatically adsorb iron filings generated during the gear hobbing process. After the power is turned off, it is easy to clean them up. The universal wheels 14 set at the four corners of the lower end of the base 1 work together with the electric support legs 15. The universal wheels 14 enable the whole machine to move easily. After it is in place, the electric support legs 15 extend and support it firmly on the ground, effectively suppressing processing vibration, significantly improving the ease of operation and the cleanliness of the working environment, and fundamentally ensuring the stability and accuracy of the processing.

[0033] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, 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 process, method, article, or apparatus.

[0034] Although embodiments of the 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 invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A precision gear hobbing machine comprising a base (1) for support, a hob assembly (2) for machining and an electrically powered guide rail (3) for moving the workpiece, characterized in that: The hob assembly (2) is fixedly installed at one side of the upper end of the base (1), the electric guide rail (3) is fixedly installed at the other side of the upper end of the base (1), the moving frame (4) is installed at the upper end of the electric guide rail (3), the workpiece rotating assembly (5) is installed in the moving frame (4), the output end of the workpiece rotating assembly (5) is fixedly connected with the bearing plate (6), the pressing assembly (7) for fixing the workpiece is installed at the upper end of the moving frame (4), the end face detection assembly (8) for testing the flatness of the workpiece is installed at the upper end of the bearing plate (6), the object carrier (9) is fixedly installed at the upper end of the end face detection assembly (8), the positioning cylinder (10) is fixedly connected with the upper end of the object carrier (9), the pressing assembly (7) is arranged in the positioning cylinder (10), and the side wall detection assembly (11) for centering measurement of the workpiece is installed on the side of the moving frame (4) close to the hob assembly (2).

2. A precision gear hobbing machine according to claim 1, characterized in that: The pressing assembly (7) comprises a hydraulic cylinder (701) and a sliding port (702), the hydraulic cylinder (701) is fixedly connected to the upper end of the moving frame (4), a plurality of sliding ports (702) are arranged, and the plurality of sliding ports (702) are arranged in an annular array, a plurality of sliding ports (702) are formed in the inner wall of the positioning cylinder (10) at the lower position, and the plurality of sliding ports (702) extend to the outside and are in communication with the outside, and the output end of the hydraulic cylinder (701) penetrates the moving frame (4), and the output end of the hydraulic cylinder (701) is rotatably connected with the limiting frame (703).

3. A precision gear hobbing machine according to claim 2, characterized in that: The top rod (704) is fixedly connected to the center of the top of the limiting frame (703), the top rod (704) is opposite to the center of the positioning cylinder (10), a plurality of limiting assemblies for extruding and fixing the inner wall of the workpiece are installed in the inner wall of the sliding port (702), the limiting assembly comprises a sliding groove (705), the sliding groove (705) is provided with two, the two sliding grooves (705) are symmetrically formed on the two sides of the sliding port (702), and the moving plate (706) is slidably connected in the two sliding grooves (705).

4. A precision gear hobbing machine according to claim 3, characterized in that: The wedge-shaped sliding block (707) is slidably arranged in the positioning cylinder (10), a group of limiting springs (708) are fixedly connected to the inner wall of the two sliding grooves (705), one end of the two groups of limiting springs (708) is fixedly connected to one side of the moving plate (706), the limiting block (709) is fixedly connected to the middle of the side, away from the wedge-shaped sliding block (707), of the moving plate (706), and the end, away from the wedge-shaped sliding block (707), of the limiting block (709) is arc-shaped.

5. A precision gear hobbing machine according to claim 1, wherein: The end face detection assembly (8) comprises telescopic rods (801), return springs (802), support columns (803) and lifting cylinders (804), the telescopic rods (801) and the return springs (802) are both provided with a plurality of, the plurality of telescopic rods (801) and the plurality of return springs (802) are both fixedly connected to the upper end of the bearing plate (6), the plurality of return springs (802) are arranged in an annular array, the plurality of telescopic rods (801) are respectively sleeved in the plurality of return springs (802), the support column (803) is fixedly connected to the center of the upper end of the bearing plate (6), and the lifting cylinder (804) is fixedly connected to the center of the lower end of the bearing plate (6).

6. A precision gear hobbing machine according to claim 5, characterized in that: The upper ends of the plurality of telescopic rods (801) and the plurality of return springs (802) are fixedly connected with a lifting plate (805), the lifting plate (805) is rotatably sleeved at the lower part outside the lifting cylinder (804), the inner wall of the lifting cylinder (804) is fixedly connected with a guide ball (806) at the lower part, the outer part of the support column (803) is provided with a spiral guide groove (807), the guide ball (806) is slidably connected in the spiral guide groove (807), and the outer wall of the lifting plate (805) is fixedly connected with a first mounting frame (808).

7. A precision gear hobbing machine according to claim 5, wherein: The side wall detection assembly (11) comprises guide rails (1101), vertical rods (1102) and connecting sleeves (1103), the guide rails (1101) are fixedly connected to one side of the moving frame (4), the vertical rods (1102) are fixedly connected to one side of the upper end of the moving frame (4), and the connecting sleeves (1103) are rotatably sleeved at the middle part outside the lifting cylinder (804).

8. A precision gear hobbing machine according to claim 7, characterized in that: The upper end of the lifting rod (1104) is provided with a moving groove (1105), the inner wall of the moving groove (1105) is rotatably connected with a one-way screw rod (1106), the moving groove (1105) is slidably connected with a second mounting frame (1107), the one-way screw rod (1106) penetrates through the second mounting frame (1107), and the second mounting frame (1107) and the one-way screw rod (1106) are externally threadedly connected.

9. A precision gear hobbing machine according to claim 8, characterized in that: The upper end of the second mounting frame (1107) is fixedly connected with a second micrometer (1108), one side of the lifting rod (1104) is rotatably connected with a straight gear (1109), the upper end of the vertical rod (1102) is fixedly connected with two racks (1110), the meshing teeth of the two racks (1110) are arranged in an up-down staggered manner, and the two racks (1110) are in meshing engagement with the straight gear (1109).

10. A precision gear hobbing machine according to claim 1, characterized in that: The base (1) upper end is fixedly connected with two symmetrically arranged fixed rods (12), and the two fixed rods (12) are fixedly connected with an electromagnetic roller (13) at the upper end.

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