A CNC belt grinding fixture and clamping and positioning method for dual-journey rectifier blades

Abstract

A CNC belt mill fixture and clamping and positioning method for a dual-journey rectifier blade are disclosed. The fixture includes an A-axis rotary table and a tailstock center on the CNC belt mill, as well as a fixture body and a positioning seat. The fixture body is mounted on a transfer plate of the A-axis rotary table on the CNC belt mill. A tool holder is provided inside the fixture body, and a spring collet is provided on the tool holder. The positioning seat is movably mounted on the fixture body and can slide in a direction perpendicular to the axis of the fixture body. A positioning plate is provided on the positioning seat, and the lower end face of the positioning plate is a positioning straight surface for contacting the tangent point of the blade's basin-direction tangent at the leading and trailing edges. The clamping and positioning method for a dual-journey rectifier blade using the aforementioned CNC belt mill fixture is described above. After the blade is clamped and positioned, there are no foreign objects interfering with the processing area of ​​the blade body, which can meet the processing requirements of the entire blade body area.

Description

Technical Field

[0001] This invention relates to the field of double-journal rectifier blade processing technology, and in particular to a CNC belt grinding fixture and clamping and positioning method for double-journal rectifier blades. Background Technology

[0002] When machining a dual-judge blade, its blade profile needs to be machined. Existing technology, such as patent application CN201811488725.4, discloses a clamping and positioning method for machining the blade profile of a dual-judge blade. On a five-axis dual-drive CNC machine tool, two tool holders are installed on each of the main A-axis and auxiliary A-axis. The journal at the locating end of the blade is placed in the tool holder on the main A-axis, without locking. The journal at the other end is placed in the tool holder on the auxiliary A-axis, also without locking. The A0 positioning program is executed, and the tool is moved to the designated position on the blade. Then, the blade is manually rotated to contact the tool holder, ensuring the locating end face is flush with the bushing, and the bushing is flush with the tool holder end face. The tool holder on the main A-axis is locked first, followed by the tool holder on the auxiliary A-axis. After the tool holders at both ends of the blade are locked, the locating tool holder is lifted and returned to the tool magazine, completing the blade clamping.

[0003] However, when grinding and polishing the blade profile of a dual-judge head rectifier, a CNC belt grinder is often used. Since the spindle precision of a CNC belt grinder is lower than that of a five-axis machining center, and the machine tool's structure cannot meet the positioning requirements of the aforementioned existing patents, the clamping and positioning method cannot be used. Summary of the Invention

[0004] The main objective of this invention is to propose a CNC belt grinding fixture and clamping and positioning method for dual-journal rectifier blades, which is applicable to the grinding and polishing of dual-journal blades based on a CNC belt grinding bed, in order to solve the above-mentioned technical problems.

[0005] To achieve the above objectives, this invention proposes a CNC belt grinding fixture for a dual-journey rectifier blade, comprising an A-axis rotary table and a tailstock center on the CNC belt grinding machine, as well as a fixture body and a positioning seat. The fixture body is mounted on the transfer plate of the A-axis rotary table on the CNC belt grinding machine. A tool holder is provided inside the fixture body, and a spring collet is provided on the tool holder. The positioning seat is movably mounted on the fixture body and can slide in a direction perpendicular to the axis of the fixture body. A positioning plate is provided on the positioning seat, and the lower end face of the positioning plate is a positioning straight surface for contacting the tangent point of the blade's basin-direction tangent at the leading and trailing edges.

[0006] Preferably, a pair of sliding grooves are provided on the cylindrical surface of the fixture body, the sliding grooves being perpendicular to the axis of the fixture body; a pair of sliding columns are provided on the positioning seat, the sliding columns slidingly engaging with the sliding grooves.

[0007] Preferably, the spring collet is an ER32 type spring collet.

[0008] On the other hand, the present invention also proposes a clamping and positioning method for a CNC belt grinder for a dual-journey rectifier blade, using the aforementioned CNC belt grinder fixture, comprising the following steps:

[0009] Step 1: Insert the positioning end journal of the dual-journal rectifier blade into the spring collet, and then insert the spring collet into the tool holder inside the fixture body, without locking it;

[0010] Step 2: Install the positioning seat onto the fixture body and slide the positioning seat so that the lower end face of the positioning plate contacts the tangent point of the blade basin tangent on the leading and trailing edges to position the A-axis angular direction of the dual-judge blade.

[0011] Step 3: Use the tailstock center on the CNC belt grinder to press against the journal at the other end of the double-journal rectifier blade, and simultaneously lock the tool holder to complete the fixation of the remaining degrees of freedom;

[0012] Step 4: After locking the dual-judge blades, retrieve the positioning seat. The blades are now positioned and clamped.

[0013] Preferably, when the dual-jersey rectifier blade is clamped and aligned, the dual-jersey rectifier blade is kept in the clamped and positioned state without removing the positioning seat. The top surface B of the positioning seat is aligned with the Y-axis of the CNC belt sander using a dial indicator. The value A displayed on the CNC belt sander operation panel is then compensated to the machine tool coordinates. The distance between the tangent line that is in contact with the positioning plate and the origin of the machining coordinate system of the dual-jersey rectifier blade is then obtained using a lever dial indicator.

[0014] Preferably, when positioning the blade model, the modeling of the dual-judge blade is completed in UG, and the workpiece coordinate system is rotated to coincide with the machining coordinate system; a straight line is drawn using the distance between the tangent line and the origin of the workpiece machining coordinate system, and a tangent line is drawn that is tangent to the leading and trailing edges of the blade model. The coordinate system is moved so that the Y vector direction of the machining coordinate system is parallel to the tangent line direction at this time, so that the A-axis angle is fixed at 0° initially, and the model positioning is completed.

[0015] Due to the adoption of the above technical solution, the beneficial effects of the present invention are as follows:

[0016] (1) Compared with existing clamping and positioning methods, after the blade is clamped and positioned, there is no foreign matter interfering with the machining area of ​​the blade body, which can meet the machining of the entire blade body. Moreover, the positioning seat used with the fixture adopts a movable structure between itself and the fixture body. After positioning, the positioning seat can be removed. The simple and effective positioning method can realize the tangential positioning of different models of dual-journal rectifier blades. With the tool holder with replaceable ER32 spring collet, the clamping and positioning of different models of dual-journal rectifier blades can be completed. This can solve the problem of difficult clamping and positioning of all dual-journal blades on CNC belt grinders, and reduce the cost of fixture manufacturing and the time for model change and debugging.

[0017] (2) Processing tests show that the fixture provided by the present invention has small deformation during clamping and positioning. The blade body and front and rear edges can be ground and polished in one clamping. The positioning method is simple and different blade models can be processed by simply changing the ER32 spring collet in the tool holder and calling the corresponding blade processing program. This greatly reduces the manufacturing cost of the fixture and the preparation time for changing different blade models. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0019] Figure 1 A schematic diagram of the overall structure of a CNC belt grinding fixture for a dual-judge blade provided by the present invention;

[0020] Figure 2 This is a three-dimensional structural diagram of the CNC belt grinding fixture for clamping blades in this invention;

[0021] Figure 3 This is a front view of the clamp body and the positioning seat in this invention.

[0022] Figure 4 This is a bottom view of the clamp body and the positioning seat in this invention.

[0023] Explanation of icon numbers:

[0024] 1. A-axis rotary table; 2. Tailstock center; 3. Fixture body; 4. Positioning seat; 401. Positioning plate; 402. Sliding column; 5. Spring collet. Detailed Implementation

[0025] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0026] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indication will also change accordingly.

[0027] Combination Figures 1 to 4 As shown, a CNC belt sander fixture for a dual-judge blade includes an A-axis rotary table 1 and a tailstock center 2 on the CNC belt sander, as well as a fixture body 3 and a positioning seat 4. The fixture body 1 is mounted on the adapter plate of the A-axis rotary table 1 on the CNC belt sander. A tool holder is provided inside the fixture body 3, and a spring collet 5 is provided on the tool holder. The positioning seat 4 is movably mounted on the fixture body 3 and can slide in a direction perpendicular to the axis of the fixture body 3. A positioning plate 401 is provided on the positioning seat 4, and the lower end face of the positioning plate 401 is a positioning straight surface for contacting the tangent point of the blade's basin chord tangent at the leading and trailing edges.

[0028] A pair of sliding grooves 301 are provided on the cylindrical surface of the fixture body 3, and the sliding grooves 301 are perpendicular to the axis of the fixture body 3; a pair of sliding columns 402 are provided on the positioning seat 4, and the sliding columns 402 are slidably engaged with the sliding grooves 301.

[0029] In this embodiment, the spring collet 5 is an ER32 type spring collet.

[0030] This embodiment also provides a clamping and positioning method for a CNC belt sander of a dual-journey rectifier blade, using the aforementioned CNC belt sander fixture, including the following steps:

[0031] Step 1: Insert the positioning end journal of the dual-journal rectifier blade into the spring collet 5, and then insert the spring collet 5 into the tool holder inside the fixture body 3, without locking it;

[0032] Step 2: Install the positioning seat 4 onto the fixture body 3, and slide the positioning seat 4 so that the lower end face of the positioning plate 401 contacts the tangent point of the blade basin tangent on the leading and trailing edges, so as to position the A-axis angular direction of the dual-judge blade.

[0033] Step 3: Use the tailstock center 2 on the CNC belt abrasive to press against the journal at the other end of the double-journal rectifier blade, and simultaneously lock the tool holder to complete the fixation of the remaining degrees of freedom;

[0034] Step 4: After locking the dual-axis rectifier blades, retrieve the positioning seat 4. The blades are now positioned and clamped.

[0035] When the dual-journal rectifier blade is clamped and aligned, keep the dual-journal rectifier blade in the clamped and positioned state, and do not remove the positioning seat 4. Use a dial indicator to make the top surface B of the positioning seat 4 parallel to the coordinate Y axis of the CNC belt sander. Compensate the A value displayed on the CNC belt sander operation panel to the machine tool coordinate system. Then use a lever dial indicator to obtain the distance between the tangent line that is in contact with the positioning plate 401 and the origin of the machining coordinate system of the dual-journal rectifier blade.

[0036] When positioning the blade model, the model of the dual-judge blade is completed in UG, and the workpiece coordinate system is rotated to coincide with the machining coordinate system. A straight line is drawn using the distance between the tangent line and the origin of the workpiece machining coordinate system. The tangent line is tangent to the leading and trailing edges of the blade model. The coordinate system is moved so that the Y vector direction of the machining coordinate system is parallel to the direction of the tangent line at this time. The A-axis angle is fixed at 0° initially, and the model positioning is completed.

[0037] After completing the above operations, program the workpiece to rotate to the 0° position of axis A at the beginning of each program, thereby completing the positioning of axis A.

[0038] In actual operation, the journal end of the positioning surface of the dual-journal rectifier blade is installed in the spring clip 5, and then inserted into the tool holder. The A-axis positioning is completed by the positioning straight surface at the lower end of the positioning plate 401 on the positioning seat 4 fully contacting the tangent point of the chord tangent of the dual-journal rectifier blade. The tailstock center 2 of the machine tool is started to tighten the blade. Finally, the tool holder is locked, and the positioning seat 4 is retrieved to complete the clamping and positioning of the blade.

[0039] The above description is merely a preferred embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural transformations made using the contents of the present invention's specification and drawings under the inventive concept of the present invention, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present invention.

Claims

1. A CNC belt sander fixture for a double-judge blade, comprising an A-axis rotary table (1) and a tailstock center (2) on a CNC belt sander, characterized in that, It also includes a fixture body (3) and a positioning seat (4); the fixture body (3) is mounted on the transfer plate of the A-axis rotary table (1) of the CNC belt sander; a tool holder is provided inside the fixture body (3), and a spring collet (5) is provided on the tool holder; the spring collet (5) is an ER32 type spring collet; The positioning seat (4) is movably mounted on the fixture body (3), and the positioning seat (4) can slide in a direction perpendicular to the axis of the fixture body (3); a pair of sliding grooves (301) are provided on the cylindrical surface of the fixture body (3), and the sliding grooves (301) are perpendicular to the axis of the fixture body (3); a pair of sliding columns (402) are provided on the positioning seat (4), and the sliding columns (402) slide in cooperation with the sliding grooves (301); A positioning plate (401) is provided on the positioning seat (4). The lower end face of the positioning plate (401) is a positioning straight surface used to contact the tangent point of the blade basin tangent on the front and rear edges. The positioning seat (4) and the clamp body (3) adopt a movable structure, and the positioning seat (4) can be removed after positioning is completed; After the blade is clamped and positioned, there are no foreign objects interfering with the processing area of ​​the blade body, which can meet the processing needs of the entire blade body. The positioning method of the positioning seat (4) can realize the tangential positioning of different models of dual-axis rectifier blades. With the tool holder with replaceable ER32 spring collet, it can complete the clamping and positioning of different models of dual-axis rectifier blades.

2. A clamping and positioning method for a CNC belt mill of a double-journey rectifier blade, characterized in that, The CNC belt abrasive fixture according to claim 1 includes the following steps: Step 1: Insert the positioning end journal of the double-journal rectifier blade into the spring collet (5), and then insert the spring collet (5) into the tool holder inside the fixture body (3), without locking it; Step 2: Install the positioning seat (4) onto the fixture body (3) and slide the positioning seat (4) so ​​that the lower end face of the positioning plate (401) contacts the tangent point of the blade basin tangent on the front and rear edges to position the A-axis angular direction of the double-judge blade. Step 3: Use the tailstock center (2) on the CNC belt abrasive to press against the journal at the other end of the double-journal rectifier blade, and lock the tool holder at the same time to complete the fixation of the remaining degrees of freedom; Step 4: After locking the dual-axis rectifier blades, retrieve the positioning seat (4). The blades are now positioned and clamped.

3. The clamping and positioning method for a CNC belt mill of a double-journey rectifier blade as described in claim 2, characterized in that, When the double-axis rectifier blade is clamped and aligned, keep the double-axis rectifier blade in the clamped and positioned state and do not remove the positioning seat (4). Use a dial indicator to make the top surface B of the positioning seat (4) parallel to the coordinate Y axis of the CNC belt sander. Compensate the A value displayed on the CNC belt sander operation panel to the machine tool coordinate. Then, the distance between the tangent line that is in contact with the positioning plate (401) and the origin of the machining coordinate system of the double-axis rectifier blade is obtained by using a lever dial indicator.

4. The clamping and positioning method for a CNC belt mill of a double-journey rectifier blade as described in claim 3, characterized in that, When positioning the blade model, the model of the dual-judge blade is completed in UG, and the workpiece coordinate system is rotated to coincide with the machining coordinate system. A straight line is drawn using the distance between the tangent line and the origin of the workpiece machining coordinate system. The tangent line is tangent to the leading and trailing edges of the blade model. The coordinate system is moved so that the Y vector direction of the machining coordinate system is parallel to the direction of the tangent line at this time. The A-axis angle is fixed at 0° initially, and the model positioning is completed.

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