Rectangular spline single-cone expansion sleeve hobbing clamp

Abstract

The utility model relates to the technical field of gear machining, in particular to a rectangular spline single-cone expansion sleeve hobbing clamp, which comprises a clamp mechanism and is used for positioning and fixing a workpiece in the machining process, and the clamp mechanism comprises a main body component, a clamping component and a clamping component, the fixing assembly comprises a spline expansion sleeve installed on the clamp mechanism and a third installation hole formed in the outer edge of the spline expansion sleeve, the spline expansion sleeve is locked and fixed through cooperation of the third installation hole and a third screw, a conical surface is formed in the spline expansion sleeve, and a conical head rod is installed in the spline expansion sleeve in a penetrating and inserting mode. The limiting assembly is installed on the fixing assembly and used for limiting the axial position of the workpiece; a gap between the clamp and a workpiece is eliminated through expansion of the spline expansion sleeve, meanwhile, the problems that a small rectangular spline clamp is poor in rigidity and slow in clamping are solved through the spline expansion sleeve, and reliable axial positioning and radial gapless positioning are achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of gear processing, in particular to a rectangular spline single-cone expansion sleeve gear hobbing fixture. Background Art

[0002] The rectangular spline single-taper expansion sleeve gear hobbing fixture is a fixture specifically designed for machining rectangular splines. Its design and application are of great significance for improving machining accuracy and production efficiency. Its working principle is as follows: a grooved nut is used to press the gland onto the inner end face of the single-taper expansion sleeve, achieving a gapless fit within the product's inner bore. A small flange nut is then used to clamp the product through a split washer and gland.

[0003] After checking the publication number: CN221336944U, a shaft gear hobbing fixture is disclosed. This technology discloses "a shaft gear hobbing fixture, which is suitable for shaft workpieces with a thread at one end, and includes a seat center and a threaded sleeve, the seat center is fixedly connected to the machine tool workbench and opposite to the machine tool center, one end of the threaded sleeve is outer-circuited on the seat center and fixedly connected, and the other end is provided with an internal thread or an external thread, and the internal thread or the external thread cooperates with the thread on the workpiece to clamp the workpiece", etc. The technical solution has "the thread on the workpiece is used to cooperate with the threaded sleeve fixedly connected to the seat center to achieve workpiece clamping. Since the hobbing fixture adopts a threaded connection to cooperate with the seat center to clamp the workpiece, the fixture avoids uncertainty and processing errors caused by fitting clearance, and can effectively reduce the demand for clamping length, and only a short clamping length is required to achieve effective clamping" and other technical effects;

[0004] In fact, during the gear hobbing process, it is necessary to maintain a certain coaxiality between the processed tooth part and the positioning hole. Generally, a fixed gear hobbing mandrel is used for centering, and a nut is installed on the gear hobbing mandrel for fastening. Since there is a certain matching tolerance between the gear hobbing mandrel and the positioning hole, this may cause the mandrel to shake or offset in the positioning hole, thereby affecting the coaxiality. Insufficient or excessive tightening force of the nut may cause the gap between the mandrel and the positioning hole to change. If the force is insufficient, the mandrel may become loose; if the force is too great, the mandrel or the positioning hole may be deformed, which also affects the coaxiality. Utility Model Content

[0005] In response to the shortcomings of the existing technology, the utility model provides a rectangular spline single-taper expansion sleeve gear hobbing fixture, which eliminates the gap between the spline expansion sleeve and the workpiece through the expansion of the spline expansion sleeve. At the same time, the spline expansion sleeve solves the poor rigidity and slow clamping of small rectangular spline fixtures, achieving the characteristics of reliable axial positioning and radial gap-free positioning.

[0006] To achieve the above objectives, the present invention is implemented through the following technical solutions: A rectangular spline single-taper expansion sleeve gear hobbing fixture includes a fixture mechanism and is used for positioning and fixing the workpiece during processing. The fixture mechanism includes:

[0007] The main assembly is mounted on the rotary cylinder and provides power to the clamp mechanism during operation;

[0008] The fixing assembly includes a spline expansion sleeve mounted on the fixture mechanism, a third mounting hole formed inside the outer edge of the spline expansion sleeve, the spline expansion sleeve being locked and fixed by a third screw through the third mounting hole, a conical surface formed inside the spline expansion sleeve, and a conical head rod inserted and installed inside the spline expansion sleeve;

[0009] The limit assembly is installed on the fixed assembly and is used to limit the axial position of the workpiece.

[0010] Preferably, the limit assembly includes a positioning plate mounted on the spline expansion sleeve and fitted with its end face, a threaded through hole is opened on the inner outer edge of the positioning plate, and the positioning plate is locked and fixed by the threaded through hole and the slotted tapered end set screw to ensure end jump.

[0011] Preferably, the main body component includes a connecting seat that is fittedly installed on the end face of the cylinder, and the spline expansion sleeve boss is fitted into the end face of the inner hole of the connecting seat, a through hole is opened in the center of the interior of the connecting seat, a connecting rod is inserted and installed in the through hole, and the connecting rod is connected to the cylinder to transmit power, a first mounting hole is opened on the inner outer edge of the connecting seat, and the connecting seat is installed and fixed by cooperating with the first screw through the first mounting hole.

[0012] Preferably, the main body assembly further comprises a second mounting hole provided on one side of the interior of the connecting seat, and a second screw threadedly mounted in the interior of the second mounting hole is used to support the connecting rod to prevent circumferential rotation.

[0013] Preferably, the clamp mechanism further comprises a calibration piece which is sleeved on the spline expansion sleeve and is used for calibration before processing.

[0014] Preferably, the clamp mechanism further comprises a threaded recessed hole provided inside the connecting rod, and the inner end of the cone head rod is threadedly connected to the threaded recessed hole.

[0015] Beneficial effects

[0016] The utility model provides a rectangular spline single-taper expansion sleeve gear hobbing fixture. Compared with the existing technology, it has the following advantages:

[0017] (1) By putting the workpiece to be processed on the spline expansion sleeve and then pushing the cone head rod inward, the cone head rod squeezes the spline expansion sleeve from the inside to the outside to make it expand outward, thereby tightening the workpiece; pulling the cone head rod outward to release the squeezing of the spline expansion sleeve, thereby loosening the workpiece; the expansion of the spline expansion sleeve eliminates the gap between the spline expansion sleeve and the workpiece, and at the same time, the spline expansion sleeve solves the poor rigidity and slow clamping of the small rectangular spline fixture, achieving reliable axial positioning and radial gap-free positioning.

[0018] (2) The axial position of the workpiece after being fixed is limited by the positioning disk to ensure that the workpiece will not move axially after being fixed, thereby improving the positioning accuracy of the workpiece; the cone head rod is limited and prevented from deflecting by the second screw, and a certain gap is ensured to allow the cone head rod to slide. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural diagram of the utility model;

[0020] Figure 2 This is a schematic structural diagram of the main components of the present invention;

[0021] Figure 3 This is a schematic structural diagram of the connecting rod in the present utility model;

[0022] Figure 4 This is a schematic diagram of the structure of the fixing assembly in the present utility model;

[0023] Figure 5 This is a schematic structural diagram of the cone head rod in the utility model;

[0024] Figure 6 This is a schematic structural diagram of the position limiting assembly in the utility model;

[0025] Figure 7 This is a schematic diagram of the structure of the calibration component in the present utility model.

[0026] In the figure: 1. Clamp mechanism; 11. Main body assembly; 111. Connecting seat; 112. Through hole; 113. Connecting rod; 114. First mounting hole; 115. First screw; 116. Second mounting hole; 117. Second screw; 12. Fixing assembly; 121. Spline expansion sleeve; 122. Third mounting hole; 123. Conical surface; 124. Third screw; 125. Conical head rod; 13. Limiting assembly; 131. Positioning plate; 132. Threaded through hole; 133. Slotted tapered end set screw; 14. Calibration piece; 15. Threaded recessed hole. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0028] See also Figure 1-7 The utility model provides a technical solution for a rectangular spline single-taper expansion sleeve gear hobbing fixture: the rectangular spline single-taper expansion sleeve gear hobbing fixture includes a fixture mechanism 1 and is used for positioning and fixing the workpiece during processing. The fixture mechanism 1 includes:

[0029] The main assembly 11 is mounted on the rotary cylinder and provides power for the clamp mechanism 1 during operation;

[0030] The fixing assembly 12 includes a spline expansion sleeve 121 mounted on the clamp mechanism 1, a third mounting hole 122 defined within the outer edge of the spline expansion sleeve 121, the spline expansion sleeve 121 being secured by a third screw 124 through the third mounting hole 122, a tapered surface 123 defined within the spline expansion sleeve 121, and a tapered rod 125 inserted and mounted through the spline expansion sleeve 121.

[0031] The limiting assembly 13 is mounted on the fixing assembly 12 and is used to limit the axial position of the workpiece.

[0032] In this embodiment, the workpiece to be processed is put on the spline expansion sleeve 121, and then the cone head rod 125 is pushed inward, so that the cone head rod 125 squeezes the spline expansion sleeve 121 from the inside to the outside to make it expand outward, thereby tightening the workpiece; the cone head rod 125 is pulled outward to release the squeezing of the spline expansion sleeve 121, thereby loosening the workpiece; the expansion of the spline expansion sleeve 121 eliminates the gap between the spline expansion sleeve 121 and the workpiece, and at the same time, the spline expansion sleeve 121 solves the poor rigidity and slow clamping of the small rectangular spline clamp, thereby achieving reliable axial positioning and radial gap-free positioning.

[0033] Specifically, the limiting assembly 13 includes a positioning plate 131 which is sleeved on the spline expansion sleeve 121 and fits with its end face. A threaded through hole 132 is opened on the inner outer edge of the positioning plate 131, and the positioning plate 131 is locked and fixed by the threaded through hole 132 and the slotted tapered end setting screw 133 to ensure end jump.

[0034] In this embodiment, the positioning plate 131 limits the axial position of the workpiece after it is fixed, ensuring that the workpiece does not move axially after it is fixed, thereby improving the positioning accuracy of the workpiece.

[0035] Specifically, the main body component 11 includes a connecting seat 111 that is fitted on the end face of the cylinder, and the boss of the spline expansion sleeve 121 is inserted into the end face of the inner hole of the connecting seat 111 and fits therewith. A through hole 112 is opened in the center of the connecting seat 111, and a connecting rod 113 is inserted and installed in the through hole 112, and the connecting rod 113 is connected to the cylinder to transmit power. A first mounting hole 114 is opened on the outer edge of the connecting seat 111, and the connecting seat 111 is installed and fixed through the first mounting hole 114 and the first screw 115.

[0036] Specifically, the main assembly 11 further includes a second mounting hole 116 opened on one side of the inner portion of the connecting seat 111 , and a second screw 117 threadedly mounted in the inner portion of the second mounting hole 116 is used to support the connecting rod 113 to prevent circumferential rotation.

[0037] In this embodiment, the second screw 117 is used to limit the position of the cone head rod 125 and prevent it from deflecting, and to ensure that a certain gap can enable the cone head rod 125 to slide.

[0038] Specifically, the fixture mechanism 1 further includes a calibration piece 14 that is sleeved on the spline expansion sleeve 121 and is used for calibration before processing.

[0039] In this embodiment, before use, the calibration part 14 can be installed on the spline expansion sleeve 121 and tightened, and a micrometer can be installed on the bed to check the radial runout of the standard calibration. The axial and radial strokes of the hob can be adjusted according to the standard calibration parts, and then the tightening can be released to remove the calibration part 14 for subsequent workpiece processing.

[0040] Specifically, the clamp mechanism 1 further includes a threaded recessed hole 15 provided inside the connecting rod 113 , and the inner end of the cone head rod 125 is threadedly connected to the threaded recessed hole 15 .

[0041] In this embodiment, the middle section of the cone head rod 125 contacts the inner hole of the spline expansion sleeve 121 to ensure an up and down movement clearance of 0.003 to 0.008 mm.

[0042] The working principle and usage process of the present invention are as follows: first, the workpiece to be processed is put on the spline expansion sleeve 121, and the axial position of the workpiece after being fixed is limited by the positioning plate 131 to ensure that the workpiece will not move axially after being fixed; then, the cone head rod 125 is pushed inward, so that the cone head rod 125 squeezes the spline expansion sleeve 121 from the inside to the outside to make it expand outward, thereby tightening the workpiece; the cone head rod 125 is pulled outward to release the squeezing of the spline expansion sleeve 121, thereby loosening the workpiece; the expansion of the spline expansion sleeve 121 eliminates the gap between the spline expansion sleeve 121 and the workpiece, and at the same time, the spline expansion sleeve 121 solves the poor rigidity and slow clamping of the small rectangular spline clamp, thereby achieving reliable axial positioning and radial gap-free positioning.

[0043] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus.

[0044] Although the embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. Rectangular spline single taper expansion sleeve gear hobbing fixture, characterized by: The invention comprises a fixture mechanism (1) and is used for positioning and fixing a workpiece during machining. The fixture mechanism (1) comprises: A main assembly (11) is mounted on the rotary cylinder and provides power for the clamping mechanism (1) during operation; A fixing assembly (12) includes a spline expansion sleeve (121) mounted on the clamp mechanism (1), a third mounting hole (122) provided inside the outer edge of the spline expansion sleeve (121), the spline expansion sleeve (121) being locked and fixed by a third screw (124) through the third mounting hole (122), a conical surface (123) provided inside the spline expansion sleeve (121), and a conical head rod (125) inserted and installed through the spline expansion sleeve (121); A limiting assembly (13) is mounted on the fixing assembly (12) and is used to limit the axial position of the workpiece.

2. The rectangular spline single-taper expansion sleeve gear hobbing fixture according to claim 1, characterized in that: The limiting assembly (13) includes a positioning plate (131) sleeved on the spline expansion sleeve (121) and fitted with its end surface, a threaded through hole (132) provided on the inner outer edge of the positioning plate (131), and the positioning plate (131) is locked and fixed by a slotted tapered end set screw (133) through the threaded through hole (132) to ensure end jump.

3. The rectangular spline single-taper expansion sleeve gear hobbing fixture according to claim 1, characterized in that: The main body component (11) includes a connecting seat (111) that is fitted on the end face of the oil cylinder, and a boss of a spline expansion sleeve (121) is fitted into the end face of the inner hole of the connecting seat (111), a through hole (112) is opened in the center of the connecting seat (111), a connecting rod (113) is inserted into the through hole (112), and the connecting rod (113) is connected to the oil cylinder to transmit power, a first mounting hole (114) is opened on the outer edge of the connecting seat (111), and the connecting seat (111) is fixed by the first mounting hole (114) and the first screw (115).

4. The rectangular spline single-taper expansion sleeve gear hobbing fixture according to claim 1, characterized in that: The main body assembly (11) further includes a second mounting hole (116) provided on one side of the interior of the connecting seat (111), and a second screw (117) threadedly mounted inside the second mounting hole (116) and used to support the connecting rod (113) to prevent circumferential rotation.

5. The rectangular spline single-taper expansion sleeve gear hobbing fixture according to claim 1, characterized in that: The clamping mechanism (1) further comprises a calibration piece (14) sleeved on the spline expansion sleeve (121) and used for calibration before processing.

6. The rectangular spline single-taper expansion sleeve gear hobbing fixture according to claim 1, characterized in that: The clamp mechanism (1) further comprises a threaded recessed hole (15) formed inside the connecting rod (113), and the inner end of the cone head rod (125) is threadedly connected to the threaded recessed hole (15).

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