Four-axis machining center eight-station clamping tooling

Abstract

The eight-position clamping tool for four-axis machining center comprises a mandrel clamped between a top pin of the four-axis machining center and a three-jaw chuck and a center frame fixed coaxially on the mandrel, characterized in that the center frame is composed of a sleeve fixed on the mandrel and a clamping seat integrally formed on the sleeve in the axial direction, the number of the clamping seat is four, the clamping seat is uniformly and spacedly distributed in the circumferential direction of the sleeve, two work position grooves arranged in the axial direction are formed on each clamping seat, the two work position grooves are symmetrically distributed in mirror image, a pressing plate is detachably arranged on the clamping seat, a workpiece is arranged in the work position groove and is pressed by the pressing plate. The utility model forms one-time clamping of multiple positions and multiple processes, expands the clamping position, reduces the clamping frequency, simplifies the machining operation process, improves the machining efficiency and precision, meets the length clamping demand of the shaft system workpiece and improves the reliability and stability of clamping.

Description

Technical Field

[0001] This utility model relates to an eight-station clamping fixture for a four-axis machining center, belonging to the field of workpiece clamping technology for four-axis machining centers. Background Technology

[0002] In addition to the X, Y, and Z axes, a four-axis machining center has an A, B, or C axis that rotates around any one of the three axes, unlike a conventional machining center. This allows for the machining of more process surfaces or holes with different feed directions within the same operation, reducing the number of clamping operations and improving machining accuracy and production efficiency. Machining centers are equipped with clamping fixtures and cutting tools. The clamping fixture holds the workpiece, and the cutting tool feeds the workpiece for machining. Each machining operation requires mounting the workpiece onto different clamping fixtures, which is time-consuming and labor-intensive. To achieve multi-operation machining with a single clamping, a rotatable clamping fixture is typically installed on the machining center. The workpiece is moved to the corresponding machining position by rotating the clamping fixture, reducing the number of clamping operations. However, most clamping fixtures are single-station clamping, only able to clamp one workpiece at a time. Furthermore, for shaft-type workpieces, sufficient clamping length is required to ensure machining accuracy. Therefore, achieving multi-operation and multi-station clamping with a single clamping fixture is not easy. Utility Model Content

[0003] The four-axis machining center eight-station clamping fixture provided by this utility model forms a one-time clamping of multiple stations and multiple processes, expands the clamping stations, reduces the clamping frequency, simplifies the machining operation process, and improves machining efficiency and accuracy; it meets the length clamping requirements of shaft workpieces and improves the reliability and stability of clamping.

[0004] To achieve the above objectives, the technical solution adopted by this utility model is as follows: The four-axis machining center eight-station clamping fixture includes a mandrel clamped between the center of the four-axis machining center and a three-jaw chuck, and a center frame coaxially fixed on the mandrel. The center frame is characterized by: the sleeve fixed on the mandrel and a clamping seat integrally formed on the sleeve along the axial direction. There are four clamping seats, which are evenly spaced along the circumference of the sleeve. Each clamping seat has two axially arranged station grooves, and the two station grooves are mirror-symmetrically distributed. A pressure plate is detachably mounted on the clamping seat. The workpiece is placed in the station groove and pressed by the pressure plate.

[0005] Preferably, the end face of the clamping seat is flush with the end face of the sleeve, and the work station groove is opened axially from the end face of the clamping seat. The two work station grooves on the clamping seat are separated by a middle protrusion. A threaded blind hole is opened on the middle protrusion, and the bolt passes through the pressure plate and is tightened in the threaded blind hole to fasten the pressure plate to the clamping seat.

[0006] Preferably, the work station groove is an arc-shaped groove with a circular arc cross-section, and a chip discharge groove is opened between the work station groove and the middle protrusion for discharging iron chips.

[0007] Preferably, the chip discharge groove extends through the width of the clamping seat, and the depth of the chip discharge groove is greater than the depth of the workstation groove.

[0008] Preferably, the bottom surface of the pressure plate has a downward protruding pressure foot boss that corresponds to the work station groove. An arc-shaped clamping groove is provided on the pressure foot boss. The workpiece is clamped between the work station groove and the clamping groove. The pressure plate is separated from the middle protrusion and does not contact it.

[0009] The beneficial effects of this utility model are: This utility model discloses an eight-station clamping fixture for a four-axis machining center. The center support has four evenly distributed clamping seats on its sleeve. Each clamping seat has two mirror-symmetrical workstation grooves. A pressure plate is mounted on the clamping seat to press the workpiece in the workstation groove. Each workstation groove is a clamping station, forming eight clamping stations on the center support, enabling the simultaneous clamping of eight workpieces. After the workpiece is clamped, the mandrel is assembled between the center of the four-axis machining center and the three-jaw chuck. The three-jaw chuck drives the mandrel to rotate, sequentially rotating the workpiece to the corresponding processing position. This achieves multi-process machining with a single clamping, forming a multi-station, multi-process single clamping system. This expands the clamping stations, reduces clamping frequency, simplifies the machining operation, and improves machining efficiency and accuracy. The workpiece is placed in the workstation groove and pressed by the pressure plate. The length of the workstation groove can be set according to the length of the workpiece to meet the length clamping requirements of the shaft workpiece, improving the reliability and stability of the clamping and ensuring machining accuracy. Attached Figure Description

[0010] Figure 1 This is a schematic diagram of the eight-station clamping fixture for the four-axis machining center of this utility model.

[0011] Figure 2 for Figure 1 Side view.

[0012] Figure 3 for Figure 2 Sectional view along the AA direction.

[0013] Figure 4 for Figure 1 Top view. Detailed Implementation

[0014] The following is combined with Figures 1-4 The embodiments of this utility model will be described in detail below.

[0015] The four-axis machining center eight-station clamping fixture includes a mandrel 1 clamped between the center of the four-axis machining center and a three-jaw chuck, and a center frame 2 coaxially fixed on the mandrel. The center frame 2 is characterized by: the sleeve 3 fixed on the mandrel and a clamping seat 4 integrally formed on the sleeve 3 along the axial direction. There are four clamping seats 4, which are evenly spaced along the circumference of the sleeve 3. Each clamping seat 4 has two station grooves 5 arranged along the axial direction, and the two station grooves 5 are mirror-symmetrically distributed. A pressure plate 6 is detachably mounted on the clamping seat 4. The workpiece 100 is placed in the station groove 5 and pressed by the pressure plate 6.

[0016] The above-described eight-station clamping fixture for the four-axis machining center has four evenly distributed clamping seats 4 on the sleeve 3 of the center rest 2. Each clamping seat 4 has two mirror-symmetrical station grooves 5. A pressure plate 6 is mounted on the clamping seat 4 to press the workpiece 100 in the station groove 5. Each station groove 5 is a clamping station, forming eight clamping stations on the center rest 2, enabling the simultaneous clamping of eight workpieces 100. After the workpiece 100 is clamped in place, the mandrel 1 is assembled between the center and the three-jaw chuck of the four-axis machining center. The three-jaw chuck drives the spindle 1 to rotate, sequentially rotating the workpiece to the corresponding processing position, realizing multi-process processing with one-time clamping, forming multi-station and multi-process one-time clamping, expanding the clamping stations, reducing the clamping frequency, simplifying the processing operation, and improving processing efficiency and accuracy; the workpiece 100 is placed in the station groove 5 and pressed by the pressure plate 6. The length of the station groove 5 can be set according to the length of the workpiece 100 to meet the length clamping requirements of the shaft workpiece, improve the reliability and stability of clamping, and ensure processing accuracy.

[0017] The end face of the clamping seat 4 is flush with the end face of the sleeve 3. The work station groove 5 is opened axially from the end face of the clamping seat 4. The two work station grooves 5 on the clamping seat 4 are separated by the middle protrusion 7. The middle protrusion 7 has a threaded blind hole 71. The bolt 8 passes through the pressure plate 6 and is tightened in the threaded blind hole 71 to fasten the pressure plate 6 to the clamping seat 4. As can be seen from the attached figure, the middle protrusion 7 is located between the two workstation grooves 5 of the clamping seat 4. One workstation groove 5 is opened axially from one end face of the clamping seat 4, and the other workstation groove 5 is opened axially from the other end face of the clamping seat 4. The workpiece 100 is placed in the workstation groove 5 and extends out of the end face of the clamping seat 4. When the bolt 8 is tightened, the workpiece 100 in the workstation groove 5 is pressed by the pressure plate 6. The spindle 1 rotates to rotate the workpiece 100 to the corresponding process processing position. The tool on the four-axis machining center performs milling, drilling, chamfering and other processes on the end of the workpiece 100 in sequence. The workpiece 100 in the eight clamping positions can be processed in multiple processes.

[0018] The workstation groove 5 is an arc-shaped groove with a circular cross-section. A chip discharge groove 9 is provided between the workstation groove 5 and the central protrusion 7 to allow iron chips to be discharged. During the processing of the workpiece 100, iron chips are generated. The chip discharge groove 9 is provided on the rear side of the workstation groove 5, and the generated iron chips can be discharged outward from the chip discharge groove 9, avoiding the iron chips from entering the workstation groove 5 due to failure to be discharged in time, which would affect the clamping stability of the workpiece.

[0019] The chip discharge groove 9 extends through the width of the clamping base 5, and its depth is greater than the depth of the workstation groove 5. The chip discharge groove 9 discharges chips from both sides of the clamping base 5 in the width direction, ensuring timely discharge of iron chips.

[0020] The pressure plate 6 has a downwardly protruding pressure foot boss 61 on its bottom surface, corresponding to the workstation groove. An arc-shaped clamping groove 62 is formed on the pressure foot boss 61. The workpiece is clamped between the workstation groove 5 and the clamping groove 62. The pressure plate 6 is separated from and does not contact the intermediate protrusion 7. The clamping groove 62 contacts the workpiece 100. When the bolt 8 is tightened, the pressure plate 6 presses the workpiece 100 into the workstation groove 5. The pressure plate 6 is separated from and does not contact the intermediate protrusion 7, forming a gap space between them. This facilitates the discharge of iron filings generated during processing and prevents the intermediate protrusion 7 from supporting and limiting the pressure plate 6, ensuring that the pressure plate 6 clamps the workpiece 100 as the bolt 8 is tightened, thus improving the reliability of workpiece clamping.

[0021] The technical solutions of the embodiments of this utility model have been fully described above with reference to the accompanying drawings. It should be noted that the described embodiments are only a part of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

Claims

1. An eight-station clamping fixture for a four-axis machining center, comprising a mandrel clamped between the center of the four-axis machining center and a three-jaw chuck, and a center rest coaxially fixed on the mandrel, characterized in that: The central frame consists of a sleeve fixed on the mandrel and a clamping seat integrally formed on the sleeve along the axial direction. There are four clamping seats, which are evenly spaced along the circumference of the sleeve. Each clamping seat has two work station grooves arranged along the axial direction, and the two work station grooves are mirror-symmetrically distributed. A pressure plate is detachably mounted on the clamping seat. The workpiece is placed in the work station groove and pressed by the pressure plate.

2. The eight-station clamping fixture for a four-axis machining center according to claim 1, characterized in that: The end face of the clamping seat is flush with the end face of the sleeve. The work station groove is opened axially from the end face of the clamping seat. The two work station grooves on the clamping seat are separated by a middle protrusion. A threaded blind hole is opened on the middle protrusion. The bolt passes through the pressure plate and is tightened in the threaded blind hole to fasten the pressure plate to the clamping seat.

3. The eight-station clamping fixture for a four-axis machining center according to claim 2, characterized in that: The work station groove is an arc-shaped groove with a circular arc cross-section, and a chip discharge groove is opened between the work station groove and the middle protrusion for the discharge of iron chips.

4. The eight-station clamping fixture for a four-axis machining center according to claim 3, characterized in that: The chip discharge groove extends through the width of the clamping seat, and the depth of the chip discharge groove is greater than the depth of the workstation groove.

5. The eight-station clamping fixture for a four-axis machining center according to claim 2, characterized in that: The bottom surface of the pressure plate has a downward protruding pressure foot boss that corresponds to the work station groove. An arc-shaped clamping groove is opened on the pressure foot boss. The workpiece is clamped between the work station groove and the clamping groove. The pressure plate is separated from the middle protrusion and does not contact it.

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