Clamping fixture special for sheet gear machining
The axial and radial clamping of the gear is achieved by using an elastic rod seat and an automatically controlled expansion, pressing, and pre-pressing mechanism, which solves the problem of unstable manual clamping in the existing technology and improves the accuracy and efficiency of gear machining.
Patent Information
- Application Number
- CN202423194156.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-24
- Publication Date
- 2026-01-02
- Estimated Expiration
- 2034-12-24
AI Technical Summary
In the current processing of gears, manual clamping and fixing is unstable, resulting in large differences in tightness. This is time-consuming, labor-intensive, and can easily damage the gears. Furthermore, it cannot ensure concentricity, thus reducing processing accuracy.
The rod seat is made of elastic material and combined with an expansion mechanism, a pressing mechanism and a pre-pressing mechanism. The axial and radial forces are clamped by automatic machine tool control to ensure that the gears are fixed concentrically.
It saves manpower and time costs, reduces gear damage, improves machining accuracy, ensures concentricity between the gear and the fixture, and enhances machining quality.
Smart Images
Figure CN223749071U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to a tool fixture, in particular to a special clamping fixture for sheet gear machining, and is especially suitable for the scene of automatic clamping such as turning and milling machining. BACKGROUND
[0002] Gear refers to the wheel rim with teeth, can continuously mesh transmission movement and power mechanical element. Gear according to its tooth shape and purpose is different, and is divided into various types, but no matter which type gear, its appearance is mostly circular sheet, thus can be collectively referred to as sheet gear.
[0003] In prior art, when sheet gear is machined, the fixing of sheet gear is usually the clamping and fixing mode of core rod plus nut and gasket, that is, a center screw hole is processed at one end of the core rod, and the outer periphery of the core rod close to the end has an annular boss, the sheet gear to be machined is sleeved on the end of the core rod, one side of the sheet gear is abutted against the side surface of the annular boss, then the gasket is sleeved on the nut, and the nut is screwed into the center screw hole at the end of the core rod, so that the gasket is pressed against the other side of the sheet gear, thereby realizing the clamping and fixing of the sheet gear. However, this clamping and fixing mode usually needs manpower to complete, the tightness of clamping is greatly different, not only time-consuming and laborious, but also easy to cause damage to the sheet gear. At the same time, the sheet gear is clamped from both sides by the annular boss and the gasket, which is a kind of axial force clamping, and the sheet gear is not forced in the radial direction, so it is difficult to ensure that the sheet gear is concentric with the core rod, which will greatly reduce the machining precision of the sheet gear. SUMMARY
[0004] The utility model aims at solving the deficiency of prior art, and provides a special clamping fixture for sheet gear machining, which can save manpower and time cost, reduce damage to the sheet gear, and ensure that the sheet gear is concentric with the fixture, thereby greatly improving the machining precision.
[0005] To solve the above problems, the following technical solutions are adopted:
[0006] The special clamping fixture for sheet gear machining of the utility model is characterized by comprising a rod seat, the rod seat is cylindrical and made of elastic material, the inside of one end of the rod seat has an expansion mechanism, and the outer periphery of the rod seat has an annular boss at a position close to the end.
[0007] The expansion mechanism comprises a pull rod, the rod seat has a center through hole, and the pull rod is located in the center through hole; the end of the pull rod corresponding to the boss is conical and in the shape of a nut, the end of the center through hole of the corresponding rod seat is processed to have an inner taper surface, and the taper surface of the end of the pull rod is matched with the inner taper surface of the center through hole of the rod seat.
[0008] The top pressure mechanism comprises a top pin, and the screw cap end of the pull rod has a center blind hole, and the tip of the top pin corresponds to the position of the center blind hole.
[0009] The pre-pressing mechanism comprises a fixing sleeve, which is sleeved outside the head of the top pin; the tail diameter of the top pin is larger than the head diameter, and a compression spring is sleeved on the top pin between the fixing sleeve and the tail end surface of the top pin; the inner diameter of the fixing sleeve corresponding to one end of the rod seat is larger than the outer diameter of the rod seat at the end.
[0010] The above scheme has the following advantages:
[0011] The special clamping fixture for sheet gear machining comprises a rod seat, which is cylindrical and made of elastic material, and has an expansion mechanism inside one end, and an annular boss on the outer periphery of the rod seat at a position close to the end; the outer side of the expansion mechanism has a top pressure mechanism for driving the expansion mechanism to act, and the top pressure mechanism has a flexible pre-pressing mechanism outside one end corresponding to the expansion mechanism. In use, the sheet gear to be machined is sleeved on the rod seat, and the pre-pressing mechanism is used to press the sheet gear against the side surface of the boss of the rod seat to clamp the sheet gear in the axial force; then, the top pressure mechanism is used to drive the expansion mechanism to act, so that the corresponding end of the rod seat expands outward, and the outer peripheral surface is tightly expanded in the central hole of the sheet gear to clamp the sheet gear in the radial force. In the special clamping fixture for sheet gear machining, the actions of the top pressure mechanism and the pre-pressing mechanism can be automatically controlled by the machine tool, the size of the pressing force can be pre-set by the machine tool controller, and the clamping operation almost does not need manual intervention, which not only saves manpower and time cost, but also is not easy to cause damage to the sheet gear. At the same time, the special clamping fixture not only provides clamping in the axial force, but also provides clamping in the radial force, which can always ensure the concentric fixation of the sheet gear and the rod seat, and greatly improves the machining precision of the sheet gear. BRIEF DESCRIPTION OF DRAWINGS
[0012] Figure 1 It is a structure schematic view of the special clamping fixture for sheet gear machining. DETAILED DESCRIPTION
[0013] The present utility model will be further described in detail in combination with the drawings.
[0014] As Figure 1As shown in the utility model discloses a special clamping fixture for segment gear machining, which comprises a rod seat 1, the rod seat 1 is cylindrical and made of elastic material, the inside of one end of the rod seat 1 has an expansion mechanism, and the outer periphery of the rod seat 1 has an annular boss 11 at the position close to the end.
[0015] The expansion mechanism comprises a pull rod 2, the rod seat 1 has a central through hole, and the pull rod 2 is located in the central through hole; the boss 11 corresponds to the conical screw cap-shaped end of the pull rod 2, and the central through hole of the rod seat 1 has an inner tapered surface at one end corresponding to the boss 11, and the tapered surface of the end of the pull rod 2 is matched with the inner tapered surface of the central through hole of the rod seat 1.
[0016] The top pressure mechanism comprises a top tip 6, the screw cap end of the pull rod 2 has a central blind hole, and the tip of the top tip 6 corresponds to the position of the central blind hole.
[0017] The pre-pressing mechanism comprises a fixed sleeve 4, the fixed sleeve 4 is sleeved outside the head of the top tip 6; the tail diameter of the top tip 6 is greater than the head diameter, a compression spring 5 is sleeved on the top tip 6 between the fixed sleeve 4 and the tail end surface of the top tip 6, and the inner diameter of the end of the fixed sleeve 4 corresponding to the rod seat 1 is greater than the outer diameter of the end of the rod seat 1. The outer periphery of the end of the fixed sleeve 4 corresponding to the rod seat 1 is integrally connected with an annular pressing plate 41, and the annular pressing plate 41 has circumferentially arranged pressing ribs 42 on the end surface corresponding to the rod seat 1.
[0018] Before use, the special clamping fixture for segment gear machining of the utility model is installed on the operating table of a machine tool, and the tail end of the pull rod 2 is connected with a hydraulic cylinder. When in use, the segment gear 3 to be machined is sleeved on the rod seat 1, and one side of the segment gear 3 is abutted on the boss 11 on the outer periphery of the rod seat 1, and the pull rod 2 is pulled tightly by the hydraulic cylinder, so that the tapered surface of the outer end of the pull rod 2 is completely abutted on the inner tapered surface of the central through hole of the rod seat 1. Then, the top tip 6 is driven to move towards the rod seat 1, so that the circumferentially arranged pressing ribs 42 on the outer end surface of the fixed sleeve 4 are abutted on the other side of the segment gear 3 to be machined, and the segment gear 3 is pressed tightly on the rod seat 1 through the compression spring 5, so that the axial force clamping of the segment gear 3 is realized. Then, the top tip 6 is continuously driven to move towards the rod seat 1, so that the tip of the top tip 6 is inserted into the central blind hole of the pull rod 2. Since the outer periphery of the tip is a conical surface, when the tip is pressed against the screw cap end of the pull rod 2, the screw cap end of the pull rod 2 will slightly stretch into the central through hole of the rod seat 1. Under the mutual extrusion of the tapered surface of the screw cap end of the pull rod 2 and the inner tapered surface of the central through hole of the rod seat 1, the outer end of the rod seat 1 will uniformly expand outward, and the outer peripheral surface will be tightly expanded in the central hole of the segment gear 3, so that the radial force clamping of the segment gear 3 is realized. After clamping is completed, the machine tool can be driven to perform turning, milling and other operations on the segment gear 3.
[0019] In the special clamping fixture for machining of the sector gear, the actions of the top pressing mechanism and the pre-pressing mechanism can be automatically controlled through the machine tool, the size of the pressing force can be pre-set through the machine tool controller, the clamping operation almost does not need manual intervention, not only can save manpower and time cost, but also is not easy to cause damage to the sector gear. Meanwhile, the special clamping fixture not only provides the axial force clamping for the sector gear, but also provides the radial force clamping, can always ensure the concentric fixing of the sector gear and the rod base, greatly improves the machining precision of the sector gear.
Claims
1. A clamping jig for machining a spline gear, characterized by The rod seat (1) is cylindrical and made of elastic material, and has an expansion mechanism inside one end, and an annular boss (11) on the outer periphery of the rod seat (1) near the end; the expansion mechanism has a top pressure mechanism outside to drive the expansion mechanism to act, and the top pressure mechanism has a flexible pre-press mechanism outside corresponding to one end of the expansion mechanism.
2. The special fixture for machining of a face gear according to claim 1, characterized in that The expansion mechanism includes a pull rod (2), and the rod seat (1) has a central through hole, and the pull rod (2) is located in the central through hole; the boss (11) corresponds to a tapered nut-shaped end of the pull rod (2), and the corresponding end of the central through hole of the rod seat (1) is processed with an inner taper surface, and the tapered surface of the end of the pull rod (2) is matched with the inner taper surface of the central through hole of the rod seat (1).
3. The special fixture for machining of a face gear according to claim 2, characterized in that The top pressure mechanism includes a center blind hole on the nut end of the pull rod (2), and the tip of the center blind hole corresponds to the position of the center blind hole.
4. The special purpose clamping fixture for machining a face gear as set forth in claim 3, wherein The pre-press mechanism includes a fixed sleeve (4) which is sleeved outside the head of the center blind hole; the tail diameter of the center blind hole is larger than the head diameter, and the fixed sleeve (4) is sleeved with a compression spring (5) on the part of the center blind hole between the tail of the center blind hole and the opposite end surface of the center blind hole; the inner diameter of the fixed sleeve (4) corresponding to one end of the rod seat (1) is larger than the outer diameter of the end of the rod seat (1).
5. The special purpose clamping fixture for machining a face gear as set forth in claim 4, wherein The fixed sleeve (4) has an integral annular pressing plate (41) on the outer periphery of one end of the rod seat (1), and the annular pressing plate (41) has circumferentially arranged pressing ribs (42) on the end surface of the rod seat (1).