Clamp tool for machining threaded hole of chain wheel

Abstract

The utility model discloses a clamp tool for machining a chain wheel threaded hole. A chain wheel is provided with a chain wheel inner hole, a chain wheel pin hole and a plurality of threaded bottom holes. The clamp tool is used for fixing the chain wheel when the chain wheel is machined, and comprises a base, a clamping device, a clamping device and a clamping device, and the base is provided with an X-axis direction and a Y-axis direction; the positioning mandrel is arranged on the base and used for being matched and positioned with an inner hole of the chain wheel during machining so as to limit the chain wheel in the X-axis direction and the Y-axis direction; the supporting mechanism is arranged on the base; and the positioning pin is movably arranged on the supporting mechanism and used for being matched and positioned with the chain wheel pin hole during machining so as to limit the rotating direction of the chain wheel. When a chain wheel screw hole is machined, after the clamp tool designed by the utility model is used for fixing, the machining precision requirement can be met, and the machining efficiency is high.

Description

Technical Field

[0001] This utility model relates to the field of sprocket manufacturing technology, specifically to a fixture for machining sprocket thread holes. Background Technology

[0002] Generally, four threaded holes need to be machined on the sprocket. Since there are already four threaded bottom holes on the sprocket blank, it is necessary to continue machining on the basis of the existing threaded bottom holes so that the threaded bottom holes are machined into threaded holes. At the same time, the four threaded holes machined on the sprocket also need to meet the threaded hole angle position requirements (±0.3°). Therefore, the sprocket needs to be positioned during the machining process.

[0003] Currently, the existing methods for machining sprocket thread holes mainly include: (1) positioning by the external teeth of the sprocket, that is, using three or more fixing pins inserted between the teeth of the external teeth of the sprocket to achieve the effect of positioning the sprocket, and then using a multi-spindle machine to drive four taps to tap the thread bottom hole at the same time to form a thread hole; however, this method of positioning by the external teeth of the sprocket has the problem that due to the large number of teeth of the sprocket, it is easy to make a mistake in the position when installing the sprocket, which will cause the tap to collide with the sprocket and cause the tap to break; (2) positioning by the inner hole of the sprocket, and then tapping each thread hole of the sprocket separately, which requires machining four times; this method of positioning by the inner hole has the problem that the position of the sprocket thread hole needs to be corrected when tapping each thread hole, resulting in long processing time and low efficiency. Utility Model Content

[0004] The purpose of this utility model is to provide a fixture for machining sprocket thread holes, addressing the problems existing in the current sprocket external tooth positioning method and sprocket internal hole positioning method used in machining sprocket thread holes, so as to solve the sprocket positioning problem during sprocket thread hole machining, thereby solving the problems existing in the above-mentioned sprocket positioning methods.

[0005] To achieve the above objectives, this utility model is implemented through the following technical solution:

[0006] This utility model designs a fixture for machining sprocket thread holes. First, the sprocket to be machined (sprocket blank) originally has a sprocket inner hole, a sprocket pin hole and several threaded bottom holes. The fixture is used to fix the sprocket during machining (specifically, the fixture is used to fix the sprocket during the process of machining the threaded bottom holes into threaded holes).

[0007] The fixture includes:

[0008] The base has X-axis and Y-axis directions;

[0009] A positioning mandrel, which is mounted on the base, is used to match and position the sprocket's inner hole during processing, thereby limiting the sprocket's movement in the X and Y axes.

[0010] A support mechanism is provided on the base;

[0011] And a positioning pin, which is movably mounted on the support mechanism, is used to match and position with the sprocket pin hole during processing, so as to limit the rotation direction of the sprocket.

[0012] Furthermore, a fixture for machining threaded holes in sprockets includes a base with several fixing holes. These fixing holes allow the fixture to be secured in place.

[0013] Furthermore, a fixture for machining sprocket thread holes includes a support mechanism comprising a first support block, a second support block, and a connecting rod.

[0014] The first support block is disposed on the base, one end of the second support block is connected to the first support block through a connecting rod, and the other end extends toward the positioning mandrel with an adjustable extension distance; a positioning pin hole is provided on the extended end of the second support block, and the positioning pin is inserted into the positioning pin hole.

[0015] Furthermore, a fixture for machining sprocket thread holes includes a second support block with an adjustment groove; a connecting rod is disposed in the adjustment groove to movably connect the first support block and the second support block, thereby adjusting the distance from the second support block to the positioning mandrel.

[0016] Furthermore, a fixture for machining sprocket thread holes: the adjustment groove is configured as an open U-shaped groove structure.

[0017] Furthermore, a fixture for machining sprocket thread holes: the first support block is movably mounted on the base.

[0018] Furthermore, a fixture for machining sprocket threaded holes: the positioning mandrel is movably mounted on the base.

[0019] Specifically, the fixture designed in this invention uses a positioning mandrel to position the sprocket within its inner hole, preventing movement of the sprocket in any direction other than rotation during processing (i.e., preventing movement along the X and Y axes). Furthermore, the positioning pin, positioned with the sprocket pin hole, prevents rotation of the sprocket during processing. Therefore, the fixture of this invention, through the setting of the positioning mandrel and positioning pin, matches and positions itself with the sprocket's inner hole and pin hole respectively, ensuring a fixed position of the sprocket during processing. This avoids the problems associated with the "external tooth positioning method," where the sprocket's numerous teeth make incorrect placement easy, leading to tap collisions and tap breakage; and also avoids the problems of the "internal hole positioning method," where the sprocket's threaded hole position needs to be corrected for each tapped thread, resulting in long processing times and low efficiency.

[0020] The beneficial effects of this utility model are:

[0021] (1) Since the pin hole, threaded bottom hole and inner hole on the sprocket are all in fixed positions, this utility model designs a set of fixtures for machining the threaded holes of the sprocket. During machining, the sprocket position can be fixed by the positioning mandrel and positioning pin. Then, the multi-spindle machine can drive the tap to machine the four threaded holes of the sprocket at one time and can meet the angular size requirements of the threaded holes (tolerance ±0.3°). In summary, when machining the screw holes of the sprocket, using this fixture for fixing can not only meet the machining accuracy requirements, but also has high efficiency.

[0022] (2) The support mechanism designed in this fixture has a position adjustment function, which allows for adjustment of the position of the locating pin. This enables the locating pin to match the sprocket pin hole position on different sprockets, making the fixture suitable for different sprocket blanks and improving its applicability. In addition, the locating mandrel is movably mounted on the base. When different sprockets have different sprocket inner hole sizes, a locating mandrel with a matching diameter can be selected according to the size of the sprocket inner hole. This ensures that after the sprocket is fitted onto the locating mandrel, the sprocket has no freedom of movement in any direction other than rotating around the locating mandrel. This design allows the fixture to match different sprocket blanks and improves its applicability. Attached Figure Description

[0023] To more clearly illustrate the technical solutions of the embodiments of this utility model, 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 utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1This is a schematic diagram of the sprocket blank in Example 1;

[0025] Figure 2 A schematic diagram of a fixture for machining sprocket thread holes designed for Embodiment 1 of this utility model;

[0026] Figure 3 This is a top view of a fixture for machining sprocket thread holes designed for Embodiment 1 of this utility model.

[0027] The markings in the diagram are: 1-base, 2-positioning spindle, 3-support mechanism, 4-positioning pin, 5-sprocket, 11-fixing hole, 31-first support block, 32-second support block, 33-connecting rod, 34-positioning pin hole, 35-adjusting groove, 51-sprocket inner hole, 52-sprocket pin hole, 53-threaded bottom hole. Detailed Implementation

[0028] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present utility model or its application or use. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.

[0029] In the description of this utility model, it should be understood that the terms "upper," "lower," "left," "right," "top," and "bottom," etc., indicating orientation or positional relationships, are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of that feature. Moreover, the terms "first," "second," etc., are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that embodiments of this utility model described herein can be implemented in orders other than those illustrated or described herein.

[0030] Example 1

[0031] like Figures 1-3As shown, this embodiment 1 designs a fixture for machining sprocket threaded holes. The sprocket 5 has a sprocket inner hole 51, a sprocket pin hole 52, and several threaded bottom holes 53. The fixture is used to fix the sprocket 5 during machining (specifically, the fixture is used to fix the sprocket 5 during the process of machining the threaded bottom holes 53 into threaded holes). The fixture includes:

[0032] The base 1 has X-axis and Y-axis directions, and the base 1 is also provided with 4 fixing holes 11 for fixing the base 1;

[0033] The positioning mandrel 2 is movably mounted on the base 1 and is used to match and position the sprocket inner hole 51 during processing, so as to limit the sprocket 5 in the X-axis and Y-axis directions (the movably mounted positioning mandrel 2 can be replaced according to the sprocket inner hole 51).

[0034] The support mechanism 3 includes a first support block 31, a second support block 32, and a connecting rod 33. The first support block 31 is movably mounted on the base 1. The second support block 32 is provided with an adjustment groove 35 (specifically, an open U-shaped groove structure). One end of the second support block 32 is connected to the first support block 31 via the connecting rod 33, thereby movably connecting the first support block 31 and the second support block 32. The other end of the second support block 32 extends toward the positioning spindle 2, and the extension distance can be adjusted by the adjustment groove 35. A positioning pin hole 34 is provided on the extended end of the second support block 32, and the positioning pin 4 is inserted into the positioning pin hole 34.

[0035] And a positioning pin 4, which is inserted into the positioning pin hole 34, is used to match and position the sprocket 5 with the sprocket pin hole 52 during the machining of the sprocket 5, thereby limiting the rotation direction of the sprocket 5.

[0036] In the fixture of Embodiment 1 described above, the first support block 31 is movably mounted on the base 1. This design allows the first support block 31 to move. In conjunction with the adjustable second support block 32, the positioning pin 4 inserted in the second support block 32 can be adjusted in position to match the position of the sprocket pin hole in different sprockets. At the same time, the fixture of Embodiment 1 also sets the positioning mandrel 2 as a replaceable structure to match the inner hole size of the sprocket in different sprockets. This makes the fixture applicable to the screw hole processing of different sprockets, and its applicability is better.

[0037] Specifically, when machining the screw holes on the sprocket 5, the locating pin 4 must first be pulled out to the appropriate height, the inner hole 51 of the sprocket aligns with the locating mandrel 2, and the gear face down is placed on the base 1. Then, the locating pin 4 is inserted into the sprocket pin hole 52 to ensure the sprocket 5 is installed in the correct position. Then, the switch is pressed to start the multi-spindle machine, which drives four taps to machine the four threaded bottom holes 53 on the sprocket 5. After the machining requirements are met, the threaded bottom holes 53 are formed into threaded holes.

[0038] The above-described preferred embodiments of this utility model are for illustrative purposes only and are not intended to limit the scope of this utility model. Any obvious variations or modifications derived from the technical solutions of this utility model are still within the protection scope of this utility model.

Claims

1. A fixture for machining threaded holes in sprockets, characterized in that, The sprocket (5) has a sprocket inner hole (51), a sprocket pin hole (52) and several threaded bottom holes (53); The fixture is used to fix the sprocket (5) during machining, and the fixture includes: The base (1) has X-axis and Y-axis directions; A positioning mandrel (2) is set on the base (1) and is used to match and position the inner hole (51) of the sprocket during processing, so as to limit the sprocket (5) in the X-axis and Y-axis directions; A support mechanism (3) is disposed on the base (1); And a positioning pin (4), which is movably set on the support mechanism (3) and is used to match and position with the sprocket pin hole (52) during processing, so as to limit the rotation direction of the sprocket (5).

2. The fixture for machining sprocket thread holes according to claim 1, characterized in that, The base (1) is also provided with several fixing holes (11).

3. The fixture for machining sprocket thread holes according to claim 1, characterized in that, The support mechanism (3) includes: a first support block (31), a second support block (32), and a connecting rod (33); The first support block (31) is disposed on the base (1), and one end of the second support block (32) is connected to the first support block (31) through a connecting rod (33), while the other end extends toward the positioning spindle (2) and the extension distance is adjustable. The second support block (32) has a positioning pin hole (34) on its extended end, and the positioning pin (4) is inserted into the positioning pin hole (34).

4. A fixture for machining sprocket thread holes according to claim 3, characterized in that, The second support block (32) is provided with an adjustment groove (35); The connecting rod (33) is disposed in the adjusting groove (35) and the first support block (31) to movably connect the first support block (31) and the second support block (32) so as to adjust the distance of the second support block (32) extending to the positioning spindle (2).

5. A fixture for machining sprocket thread holes according to claim 4, characterized in that, The adjustment groove (35) is configured as an open U-shaped groove structure.

6. A fixture for machining sprocket thread holes according to claim 3, characterized in that, The first support block (31) is movably mounted on the base (1).

7. A fixture for machining sprocket thread holes according to claim 1, characterized in that, The positioning mandrel (2) is movably mounted on the base (1).

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