Fixture for tooth manufacturing of ultra-low workpiece

Abstract

The utility model discloses a fixture for making teeth of an ultra-low workpiece, which is characterized in that the ultra-low workpiece is clamped and fixed through two T-shaped clamping pieces, then an upper clamping piece and a lower clamping piece are fastened through a connecting bolt, the workpiece can be fixed, and then the upper clamping piece and the lower clamping piece are mounted on an external rotating shaft through through holes. The rotating shaft can drive the clamping piece and the ultra-low workpiece to rotate to be matched with an external tooth making device for tooth making. The outer side of the upper clamping piece and the outer side of the lower clamping piece make full contact with the ultralow workpiece, clamping force is evenly distributed along the circumference of the workpiece, local stress concentration is avoided, compared with a three-jaw chuck, the clamping force is evenly distributed, and deformation of the workpiece with the ultralow thickness is not prone to being caused. The upper clamping piece and the lower clamping piece are both made of high-strength materials (such as hard alloy or carbon fiber composite materials), and a double-clamping-piece symmetrical supporting structure is combined, so that the overall rigidity is remarkably improved, and the stability requirement of an ultra-thin workpiece in the high-precision tooth manufacturing machining process can be met.

Description

Technical Field

[0001] This utility model relates to the field of machining fixture technology, specifically a clamp for making teeth on ultra-low workpieces. Background Technology

[0002] In the field of machining, gear making is a key technology, especially in the manufacture of gears, cutting tools, and other parts. Traditional gear making typically uses general-purpose fixtures such as three-jaw chucks for workpiece clamping. However, for gear making of ultra-thin workpieces (such as microgears and thin-walled parts), traditional three-jaw chucks have the following problems: First, the clamping force distribution of the three-jaw chuck is uneven, which can easily lead to elliptical deformation of the workpiece, affecting machining accuracy; second, the rigidity of the three-jaw chuck is insufficient, making it difficult to meet the stability requirements of high-precision gear making for ultra-thin workpieces. Therefore, we propose a chuck for gear making of ultra-thin workpieces. Utility Model Content

[0003] The technical problem to be solved by this utility model is to overcome the existing defects and provide a clamping fixture for making teeth on ultra-low-thickness workpieces. The outer sides of the upper and lower clamping parts are in complete contact with the ultra-low-thickness workpiece, so that the clamping force is evenly distributed along the circumference of the workpiece, avoiding local stress concentration. Compared with a three-jaw chuck, the clamping force is more evenly distributed and is less likely to cause deformation of ultra-low-thickness workpieces, which can effectively solve the problems in the background art.

[0004] To achieve the above objectives, this utility model provides the following technical solution: a clamp for making teeth on ultra-low workpieces, comprising an upper clamp and a lower clamp, wherein the cross-section of the upper clamp and the lower clamp are both T-shaped, and a through hole is provided at the axis of the upper clamp and the lower clamp; a screw hole is provided near the center of the upper clamp and the lower clamp, and a connecting bolt is threaded into the screw hole.

[0005] As a preferred embodiment of this utility model, the bottom edge of the upper clip and the top edge of the lower clip are both provided with rounded corners.

[0006] As a preferred embodiment of this utility model, a keyway is provided on the inner surface of the through hole.

[0007] As a preferred embodiment of the present invention, both the upper and lower clamping parts include a circular plate portion and a cylindrical portion. The outer diameter of the cylindrical portion is smaller than the outer diameter of the circular plate portion. The circular plate portion and the cylindrical portion are coaxially arranged, and a protective pad is provided on the side surface of the circular plate portion facing the cylindrical portion.

[0008] As a preferred embodiment of this utility model, a spacer ring is sleeved on the outer side of the cylindrical portion, and the outer diameter of the spacer ring is larger than the outer diameter of the circular plate portion.

[0009] Compared with the prior art, the utility model discloses the beneficial effects are: through two T's card spare to the ultra -low workpiece and carry tightly fixed, after the upper card spare and lower card spare between fastening through the connecting bolt, can the workpiece fixedly, then the upper card spare and lower card spare pass through the through -hole installation to the pivot on outside, can drive the card spare and ultra -low workpiece rotation cooperation outside gear device and carry out the gear. BRIEF DESCRIPTION OF DRAWINGS

[0010] Figure 1 It is the structure schematic diagram of the utility model;

[0011] Figure 2 It is the internal cross section structure schematic diagram of the utility model;

[0012] Figure 3 It is the structure schematic diagram of the utility model setting interval ring;

[0013] Figure 4 It is the side view structure schematic diagram of the utility model Figure 3 .

[0014] In the drawing: 1 upper card spare, 2 lower card spare, 3 screw hole, 4 connecting bolt, 5 round angle end, 6 through -hole, 7 key groove, 8 protection pad, 9 interval ring. DETAILED DESCRIPTION

[0015] The technical scheme in the embodiments of the utility model will be described clearly and completely below in conjunction with the drawings in the embodiments of the utility model, obviously, the described embodiments are only part of the embodiments of the utility model, not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by the ordinary skill in the art without making creative labor belong to the range of protection of the utility model.

[0016] Please refer to Figures 1-4The utility model provides a kind of technical scheme: a kind of fixture for ultra-low workpiece gear cutting, including upper fixture 1 and lower fixture 2, the section of upper fixture 1 and lower fixture 2 is T-shaped, and upper fixture 1 and lower fixture 2 all include a round plate part and a cylindrical part, the outer diameter of cylindrical part is less than the outer diameter of round plate part, and round plate part and cylindrical part are coaxially arranged, when fixing ultra-low workpiece, first pass through the central hole of workpiece the cylindrical part of lower fixture 2, then the cylindrical part of upper fixture 1 is inserted into the round hole of workpiece, after the butt joint of two fixtures, screw hole 3 is set on upper fixture 1 and lower fixture 2 and is close to the center of circle, and connecting bolt 4 is threadedly connected in screw hole 3, and upper fixture 1 and lower fixture 2 are fastened by connecting bolt 4, i.e. workpiece can be fixed.

[0017] The connection of upper fixture 1 and lower fixture 2 with workpiece is interference fit, and common connection modes in prior art can be used, such as hot mounting method, cold mounting method or press mounting method, etc.

[0018] Through hole 6 is formed in the axis of upper fixture 1 and lower fixture 2, and upper fixture 1 and lower fixture 2 are installed on external rotating shaft through through hole 6, i.e. the rotating cooperation of fixture and ultra-low workpiece can be driven by rotating shaft to carry out gear cutting with external gear cutting device.

[0019] The outer side of upper fixture 1 and lower fixture 2 is in complete contact with ultra-low workpiece, so that clamping force is evenly distributed along the circumference of workpiece, local stress concentration is avoided, clamping force is evenly distributed compared with three-jaw chuck, and ultra-low workpiece is not easy to deform.

[0020] Upper fixture 1 and lower fixture 2 are made of high-strength material (such as hard alloy or carbon fiber composite material), and the symmetrical support structure of double fixture is combined to significantly improve overall rigidity, so that the stability requirement of ultra-thin workpiece in high-precision gear cutting can be met.

[0021] The size of clamping force can be accurately controlled by adjusting the pre-tightening force of connecting bolt 4, and the clamping stability is enhanced by using friction method to prevent slipping.

[0022] In addition, micro sensor can be integrated in fixture to monitor clamping force in real time and feedback adjust bolt torque, so that dynamic balance is realized.

[0023] Optionally, guiding cone surface or elastic bushing can be additionally arranged on the contact surface between cylindrical part of two fixtures and workpiece round hole, so that workpiece is automatically centered, and position deviation during clamping is reduced.

[0024] Preferably, the bottom end of the upper clamping piece 1 and the top end of the lower clamping piece 2 are provided with a rounded end 5, which facilitates the entry of the upper clamping piece 1 and the lower clamping piece 2 into the round hole of the workpiece for fixing.

[0025] Preferably, the inner side surface of the through hole 6 is provided with a key groove 7 corresponding to the external rotating shaft, so that the upper clamping piece 1 and the lower clamping piece 2 are connected to the external rotating shaft through the key, which is more convenient and fast.

[0026] Preferably, the side surface of the circular plate part towards the cylindrical part is provided with a protective pad 8, which can protect the surface of the clamping piece and the surface of the workpiece, etc., to avoid scratching, etc., and can further improve the friction force on the workpiece, reduce relative rotation, and clamp more stably.

[0027] Optionally, the outer side of the cylindrical part is sleeved with at least one spacing ring 9, which can be made of polyurethane elastomer or silicone rubber material or polyester elastic microporous structure material, etc. The outer diameter of the spacing ring 9 is greater than the outer diameter of the circular plate part. The spacing ring 9 can space multiple workpieces, and can simultaneously fix multiple ultra-low workpieces on the clamping piece, and can fix and gear multiple ultra-low workpieces, etc., which further improves the work efficiency. At the same time, when fixing and gearing ultra-low workpieces of different thicknesses, the corresponding number of spacing rings 9 can be set to fix and clamp ultra-low workpieces of different thicknesses, which improves the universality.

[0028] The parts not disclosed in the utility model are all prior art, and the specific structure, material and working principle are not described in detail. Although the embodiments of the utility model have been shown and described, it can be understood by those skilled in the art that various changes, modifications, replacements and modifications can be made to these embodiments without departing from the principles and spirits of the utility model, and the scope of the utility model is defined by the appended claims and their equivalents.

Claims

1. A clamping fixture for ultra-low workpiece gear making, characterized in that: It includes an upper clamp (1) and a lower clamp (2), both of which have T-shaped cross sections and through holes (6) at the center of the axis of both the upper clamp (1) and the lower clamp (2); both the upper clamp (1) and the lower clamp (2) have screw holes (3) near the center of the circle, and connecting bolts (4) are threaded into the screw holes (3).

2. The clamping fixture for ultra-low workpiece gear making according to claim 1, characterized in that: The bottom edge of the upper clip (1) and the top edge of the lower clip (2) are both provided with rounded corners (5).

3. The clamping fixture for ultra-low workpiece gear making according to claim 1, characterized in that: A keyway (7) is provided on the inner surface of the through hole (6).

4. The clamp for ultra-low workpiece gear making according to claim 1, characterized in that: Both the upper clamp (1) and the lower clamp (2) include a circular plate portion and a cylindrical portion. The outer diameter of the cylindrical portion is smaller than the outer diameter of the circular plate portion. The circular plate portion and the cylindrical portion are coaxially arranged. A protective pad (8) is provided on the side surface of the circular plate portion facing the cylindrical portion.

5. A clamping fixture for ultra-low workpiece gear making according to claim 4, characterized in that: A spacer ring (9) is fitted on the outer side of the cylindrical part, and the outer diameter of the spacer ring (9) is larger than the outer diameter of the circular plate part.

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