Shaft tooth type workpiece internal spline limiting and clamping fixture

Abstract

The utility model relates to a limiting and clamping fixture for an internal spline of a shaft tooth type workpiece, and belongs to the technical field of automobile gear machining equipment. According to the technical scheme, the other end of a supporting rod (5) is connected with a connecting block (6), a positioning block (7) is in a long strip shape, the connecting block (6) is movably connected with one end of the positioning block (7), the other end of the positioning block (7) is bent by 90 degrees, the head of a positioning pin (9) is matched with a tooth groove (12) of an internal spline, and the positioning pin (9) is inserted into the tooth groove (12) of the internal spline. And the bending structure of the positioning block (7) is matched with an internal spline of a workpiece (11) through a nut (8) and a positioning pin (9). The internal spline positioning pin has the advantages that the use positioning requirement can be met on the premise that the adjusting space is limited, the length and the shape of the positioning pin can be replaced according to different internal spline shapes, and machining positioning of different internal spline parameters is met.

Description

Technical Field

[0001] The utility model relates to a spline limit clamping fixture for shaft gear workpieces, which is mainly used for processing high-precision, small-batch and multi-variety workpieces through numerical control machine tools and belongs to the technical field of automobile gear processing equipment. Background Art

[0002] During the processing of automobile gears, gear end face chamfering is a very common process in the processing of automobile gears. However, the existing technology for positioning the gear end face chamfering requires the CNC machine tool to be equipped with a CNC induction probe for sideways oblique entry, and the initial angle position of the processing is determined by the automatic gear search function of the probe. However, the existing technology has the following disadvantages: 1. The working principle of the induction probe is to automatically calculate the average pitch of N groups of teeth by sensing N groups of teeth, and determine the initial angle position of the first tooth to be processed based on the calculated value. When this method encounters incomplete teeth or thinned teeth in the selected N groups of teeth, the calculated value will be distorted, resulting in deviation in the initial angle position of the first tooth to be processed. When there are high requirements for the initial angle position of the first tooth during processing, this type of gear search positioning method is unreliable. 2. The cost of separately configuring a CNC induction probe and a supporting system for the machine tool is too high. 3. Because the induction probe needs to be inserted obliquely from the side of the workpiece, the induction probe cannot be removed before each workpiece processing. This results in the adjustment space of the induction probe being limited to the space between the turret and the workpiece during processing (attached Figure 3 ), in some deep holes, the automatic spline gear finding device cannot be used because of insufficient oblique insertion angle. Utility Model Content

[0003] The utility model aims to provide a spline limit clamping fixture for shaft gear workpieces, which can achieve high-precision positioning by quickly adjusting the positioning block and the positioning pin, reduce costs, facilitate use, improve work efficiency, and solve the problems existing in the background technology.

[0004] The technical solution of the utility model is:

[0005] A limit clamping fixture for internal splines of shaft gear workpieces comprises a workpiece clamping mechanism, a support rod, a positioning block and a connecting block, wherein one end of the support rod is fixedly connected to a CNC machine tool; the workpiece clamping mechanism is arranged on the CNC machine tool, and the workpiece is clamped by the fixture, and the workpiece has internal splines; the other end of the support rod is connected to the connecting block, the positioning block is in the shape of an elongated strip, and the connecting block is movably connected to one end of the positioning block, and the other end of the positioning block is bent 90 degrees, and the head of the positioning pin matches the tooth groove of the internal spline, and the positioning pin is inserted into the tooth groove of the internal spline, and the bending structure of the positioning block is matched with the internal spline of the workpiece through a nut and a positioning pin.

[0006] Furthermore, the workpiece clamping mechanism is well known and used in the art, and comprises a connecting rod, a main body, an expansion sleeve and a positioning cap. One end of the connecting rod is threadedly mounted on the hydraulic cylinder of the CNC machine tool, and the other end of the connecting rod is connected to the expansion sleeve by a bolt. The main body is firmly positioned and installed on the end face of the CNC machine tool; the expansion sleeve is arranged at one end of the inner cavity of the main body, and the positioning cap is installed at the other end of the inner cavity of the main body, and the positioning cap clamps the workpiece through a fixture; the connecting rod, the main body, the expansion sleeve and the positioning cap are arranged on the same axis and are parallel to the axis of the support rod.

[0007] Furthermore, a rectangular groove is provided on the connecting block, and a boss is provided on the positioning block. The boss and the rectangular groove cooperate with each other and are ground separately. The grinding gap is less than 0.008 mm, thereby ensuring the angle positioning accuracy.

[0008] Furthermore, the other end of the support rod is a threaded end, and the threaded end is connected to the connecting block via threads.

[0009] Furthermore, a handle is provided on the positioning block, and the handle is screwed together with the positioning block through the positioning block thread, so that the positioning block can be freely pulled out from the connecting block before each processing.

[0010] Furthermore, a main body mounting seat is provided on the main body, and the main body is fixedly positioned and mounted on the end surface of the CNC machine tool through the main body mounting seat.

[0011] Furthermore, a support rod extension section is provided at one end of the support rod, and the support rod extension section is inserted into a positioning seat on the CNC machine tool to fixedly connect the support rod to the CNC machine tool.

[0012] Furthermore, the conical end of the positioning pin passes through the inner hole of the bending structure of the positioning block, and the other end of the positioning pin is screwed in with a nut thread.

[0013] Before each processing of the workpiece 11, the handle is held to connect the positioning block and the connecting block through the rectangular groove. The conical end of the positioning pin passes through the inner hole of the bending structure of the positioning block. The other end of the positioning pin is tightened by the nut thread, and the conical end is inserted into the tooth groove of the internal spline to achieve the initial angle position of the first tooth of the workpiece. Then the machine tool cylinder is pulled back to drive the connecting rod to achieve the clamping effect of the expansion sleeve on the workpiece. Because the positioning block can be freely pulled out of the connecting block before each processing, it can also meet the positioning requirements under the premise of limited adjustment space. The length and shape of the positioning pin can be replaced according to the different tooth groove shapes of the internal spline to meet the processing positioning of different internal spline parameters.

[0014] The beneficial effects of the utility model are: high-precision positioning can be achieved by quickly adjusting the positioning block and the positioning pin, thereby reducing costs, facilitating use, and improving work efficiency; the positioning requirements can be met under the premise of limited adjustment space, and the length and shape of the positioning pin can be replaced according to different internal spline shapes to meet the processing positioning of different internal spline parameters. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a cross-sectional view of a connecting block according to an embodiment of the utility model;

[0016] Figure 2 It is the general assembly diagram of the embodiment of the utility model;

[0017] Figure 3 Schematic diagram of space limitations for fixture adjustment;

[0018] Figure 4 Assemble the top view of the support rod and the connecting block;

[0019] Figure 5 Assemble the front and sectional views of the support rods, connecting blocks and positioning blocks;

[0020] In the figure: connecting rod 1, main body 2, expansion sleeve 3, positioning cap 4, support rod 5, connecting block 6, positioning block 7, rectangular groove, nut 8, positioning pin 9, bolt 10, workpiece 11, tooth groove 12, rectangular groove 13, handle 14, support rod extension section 15, main body mounting seat 16, tool 17, tool turret 18, oblique entry position of probe 19, adjustable space of probe 20, threaded end 21, inner hole of bending structure 22, conical end 23, positioning block thread 24, boss 25. DETAILED DESCRIPTION

[0021] The present invention will be further described below by way of examples with reference to the accompanying drawings.

[0022] A limit clamping fixture for internal spline of shaft gear workpiece, comprising a workpiece clamping mechanism, a support rod 5, a positioning block 7 and a connecting block 6, one end of the support rod 5 is fixedly connected to a CNC machine tool; the workpiece clamping mechanism is arranged on the CNC machine tool, and a workpiece 11 is clamped by the fixture, and the workpiece 11 has an internal spline; the other end of the support rod 5 is connected to the connecting block 6, the positioning block 7 is in the shape of an elongated strip, and the connecting block 6 is movably connected to one end of the positioning block 7, and the other end of the positioning block 7 is bent 90 degrees, and the head of the positioning pin 9 matches the tooth groove 12 of the internal spline, and the positioning pin 9 is inserted into the tooth groove 12 of the internal spline, and the bending structure of the positioning block 7 is matched with the internal spline of the workpiece 11 through the nut 8 and the positioning pin 9.

[0023] The workpiece clamping mechanism is well known and used in the art, and comprises a connecting rod 1, a main body 2, an expansion sleeve 3 and a positioning cap 4. One end of the connecting rod 1 is mounted on the hydraulic cylinder of the CNC machine tool through a thread, and the other end of the connecting rod 1 is connected to the expansion sleeve 3 through a bolt 10. The main body 2 is firmly positioned and installed on the end face of the CNC machine tool; the expansion sleeve 3 is arranged at one end of the inner cavity of the main body 2, and the positioning cap 4 is installed at the other end of the inner cavity of the main body 2. The positioning cap 4 clamps the workpiece 11 through a fixture; the connecting rod 1, the main body 2, the expansion sleeve 3, the positioning cap 4 and the bending part of the positioning block 7 are arranged on the same axis and are parallel to the axis of the support rod 5.

[0024] The connecting block 6 is provided with a rectangular groove 13, and the positioning block 7 is provided with a boss 25. The boss 25 cooperates with the rectangular groove 13 and is ground separately. The grinding clearance is less than 0.008 mm to ensure the angle positioning accuracy.

[0025] The other end of the support rod 5 is a threaded end 21 , and the threaded end 21 is connected to the connecting block 6 via threads.

[0026] The positioning block 7 is provided with a handle 14 , which is screwed together with the positioning block 7 through the positioning block thread 24 , so that the positioning block 7 can be freely withdrawn from the connecting block 6 before each processing.

[0027] The main body 2 is provided with a main body mounting seat 16 , and the main body 2 is fixedly positioned and mounted on the end surface of the CNC machine tool through the main body mounting seat 16 .

[0028] A support rod extension section 15 is provided at one end of the support rod 5 , and the support rod extension section 15 is inserted into a positioning seat on the CNC machine tool to fix the support rod 5 to the CNC machine tool.

[0029] The conical end 23 of the positioning pin 9 passes through the inner hole 22 of the bending structure of the positioning block 7, and the other end of the positioning pin 9 is screwed and tightened by the nut 8 through threaded engagement.

[0030] Before each processing of the workpiece 11, the handle 14 is held to connect the positioning block 7 and the connecting block 6 through the rectangular groove 13, and the conical end 23 of the positioning pin 9 passes through the inner hole 22 of the bending structure of the positioning block 7. The other end of the positioning pin 9 is screwed together with the nut 8, and the conical end 23 is inserted into the tooth groove 12 of the internal spline to achieve the initial angle position of the first tooth of the workpiece 11. Then the machine tool cylinder is pulled back to drive the connecting rod 1 to achieve the clamping effect of the expansion sleeve 3 on the workpiece 11. Because the positioning block 7 can be freely withdrawn from the connecting block 6 before each processing, it can also meet the positioning requirements under the premise of limited adjustment space. The length and shape of the positioning pin 9 can be replaced according to the different shapes of the tooth groove 12 of the internal spline to meet the processing positioning of different internal spline parameters.

[0031] In the embodiment, the induction probe needs to be inserted obliquely from the side of the workpiece 11. Figure 3 The probe is inserted obliquely into the position 19, and the induction probe cannot be removed every time before the workpiece 11 is processed. The adjustable space 20 of the induction probe is only the space between the tool turret 18 and the workpiece 11 during processing (see Appendix Figure 3 ), using the utility model, even if encountering the internal spline tooth groove of a partial deep hole, normal operation can be achieved by replacing the positioning pin 9 that matches the tooth groove length and shape of the internal spline.

Claims

1. A spline limit clamping fixture for shaft gear workpieces, characterized in that: The invention comprises a workpiece clamping mechanism, a support rod (5), a positioning block (7) and a connecting block (6), wherein one end of the support rod (5) is fixedly connected to a numerical control machine tool; the workpiece clamping mechanism is arranged on the numerical control machine tool, and a workpiece (11) is clamped by a fixture, and the workpiece (11) has an internal spline; the other end of the support rod (5) is connected to the connecting block (6), the positioning block (7) is in the shape of a long strip, the connecting block (6) is movably connected to one end of the positioning block (7), the other end of the positioning block (7) is bent 90 degrees, the head of the positioning pin (9) matches the tooth groove (12) of the internal spline, the positioning pin (9) is inserted into the tooth groove (12) of the internal spline, and the bending structure of the positioning block (7) is matched with the internal spline of the workpiece (11) through a nut (8) and the positioning pin (9).

2. The internal spline limit clamping fixture for shaft gear workpiece according to claim 1, characterized in that: The workpiece clamping mechanism comprises a connecting rod (1), a main body (2), an expansion sleeve (3) and a positioning cap (4); one end of the connecting rod (1) is mounted on a hydraulic cylinder of a numerically controlled machine tool via a thread, the other end of the connecting rod (1) is connected to the expansion sleeve (3) via a bolt (10), and the main body (2) is tightly positioned and mounted on the end surface of the numerically controlled machine tool; the expansion sleeve (3) is arranged at one end of the inner cavity of the main body (2), the positioning cap (4) is mounted at the other end of the inner cavity of the main body (2), and the positioning cap (4) clamps the workpiece (11) via a fixture; the connecting rod (1), the main body (2), the expansion sleeve (3) and the positioning cap (4) are arranged on the same axis and are parallel to the axis of the support rod (5).

3. A spline limit clamping fixture for shaft gear workpieces according to claim 1 or 2, characterized in that: The connecting block (6) is provided with a rectangular groove (13), and the positioning block (7) is provided with a boss (25), and the boss (25) and the rectangular groove (13) cooperate with each other.

4. The internal spline limit clamping fixture for shaft gear workpiece according to claim 1 or 2, characterized in that: The other end of the support rod (5) is a threaded end (21), and the threaded end (21) is connected to the connection block (6) via a thread.

5. The internal spline limit clamping fixture for shaft gear workpiece according to claim 1 or 2, characterized in that: The positioning block (7) is provided with a handle (14).

6. The internal spline limit clamping fixture for shaft gear workpiece according to claim 2, characterized in that: The main body (2) is provided with a main body mounting seat (16), and the main body (2) is fixedly positioned and mounted on the end surface of the numerical control machine tool through the main body mounting seat (16).

7. The internal spline limit clamping fixture for shaft gear workpiece according to claim 1 or 2, characterized in that: A support rod extension section (15) is provided at one end of the support rod (5), and the support rod extension section (15) is inserted into a positioning seat on the CNC machine tool to fixedly connect the support rod (5) to the CNC machine tool.

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