Numerically-controlled machine tool sixteen-station tool clamp

Abstract

The utility model discloses a numerical control machine tool sixteen-station work fixture which comprises a cross-shaped rotary table column, a front connecting and positioning assembly, a rear connecting and positioning assembly and four positioning bottom plates, the front connecting and positioning assembly and the rear connecting and positioning assembly are arranged on the front end face and the rear end face of the cross-shaped rotary table column respectively, and the four positioning bottom plates are all fixedly arranged on the cross-shaped rotary table column. A front fixing boss, a front wedge-shaped expansion clamping device, a middle fixing boss, a rear wedge-shaped expansion clamping device and a rear fixing boss are sequentially arranged on the surface of each positioning bottom plate from front to back. The tool clamp is formed by assembling split structures, the structure is compact, connection is reliable, positioning is accurate, and the machining efficiency is greatly improved through sixteen clamping stations. According to the utility model, an integrated structure of the special fixture, the combined fixture and the grouped fixture and adjustable element modularization are adopted, so that the functions of one-machine multi-sequence, one-machine multi-position, one-machine multi-surface, strong adjustability, strong universality and high precision of the fixture are realized, and the flexibility degree is greatly improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of numerical control machine tool processing, and in particular relates to a sixteen-station fixture for numerical control machine tools. Background Art

[0002] As the working machine of the equipment manufacturing industry, high-end CNC machine tools have functions such as intelligence, compound, multi-axis linkage, and network communication. In order to improve the processing efficiency of CNC machine tools, it is urgent to design a multi-station fixture to achieve the finishing method of "one machine with multiple sequences", "one machine with multiple positions", and "one machine with multiple surfaces". Utility Model Content

[0003] The utility model aims to provide a sixteen-station fixture for a numerically controlled machine tool which has a compact structure, is easy to operate and can improve the efficiency of numerically controlled machining.

[0004] To solve the above technical problems, the utility model adopts the following technical solutions: a sixteen-station fixture for a CNC machine tool, comprising a cross turntable column, a front connecting positioning assembly, a rear connecting positioning assembly and four positioning base plates, the center line of the cross turntable column is horizontally arranged along the front-to-back direction, the front connecting positioning assembly is arranged at the front end surface of the cross turntable column, the rear connecting positioning assembly is arranged at the rear end surface of the cross turntable column, the outer circle of the cross turntable column is evenly provided with four rectangular planes along the circumferential direction, the four positioning base plates are respectively fixed on a rectangular plane, the surface of each positioning base plate is sequentially provided with a front fixed boss, a front wedge-shaped expansion clamping device, a middle fixed boss, a rear wedge-shaped expansion clamping device and a rear fixed boss from front to back, and workpiece clamping stations are formed between the front fixed boss and the front wedge-shaped expansion clamping device, between the front wedge-shaped expansion clamping device and the middle fixed boss, between the middle fixed boss and the rear wedge-shaped expansion clamping device, and between the rear wedge-shaped expansion clamping device and the rear fixed boss.

[0005] The front connection positioning assembly and the rear connection positioning assembly have the same structure and are symmetrical front to back. The centers of the front and rear ends of the cross turntable column are provided with mounting grooves. The front connection positioning assembly and the rear connection positioning assembly both include a flange and a T-shaped positioning column. A through hole is provided in the center of the flange. The large end of the T-shaped positioning column extends into and is transitionally assembled in the mounting groove. The flange is fixedly connected to the end face of the cross turntable column by four first countersunk bolts and is installed in the through hole extending from the small end of the T-shaped positioning column. Positioning pins are correspondingly inserted between the flange and the end face of the cross turntable column.

[0006] The front flange is connected to the fourth axis CNC indexing turntable of the machine tool through the front connecting bolts, and the small end of the front T-shaped positioning column extends into the center hole of the fourth axis CNC indexing turntable;

[0007] The flange at the rear end is connected to the hydraulic disc brake tail seat through the rear connecting bolts, and the small end of the T-shaped positioning column at the rear end extends into the center hole of the hydraulic disc brake tail seat.

[0008] The positioning base plate is fixedly connected with the cross turntable column through second countersunk bolts which are countersunk inside the front fixing boss, the middle fixing boss and the rear fixing boss.

[0009] The front wedge-shaped expansion clamping device and the rear wedge-shaped expansion clamping device have the same structure and are arranged symmetrically front to back. The front wedge-shaped expansion clamping device and the rear wedge-shaped expansion clamping device both include a front clamping wedge, a middle V-shaped block and a rear clamping wedge. The front clamping wedge and the rear clamping wedge are both slidably connected to the positioning base plate. The front side surface of the front clamping wedge and the rear side surface of the rear clamping wedge are both planar structures perpendicular to the surface of the positioning base plate. A V-shaped groove is formed between the rear side surface of the front clamping wedge and the front side surface of the rear clamping wedge. The middle V-shaped block is assembled in the V-shaped groove, and the middle V-shaped block is connected to the positioning base plate by a third countersunk bolt.

[0010] A chip groove with a length direction parallel to the center line of the cross turntable is provided between two adjacent rectangular planes on the cross turntable column, and the bottom profile of the cross section of the chip groove is an arc with a central angle of 90 degrees.

[0011] Using the above technical solution, the specific steps of installing the fixture of the utility model on the CNC machine tool and processing the workpiece are as follows:

[0012] (1) Install the four positioning base plates one by one on the four rectangular planes of the cross turntable column, insert the second countersunk bolts into the countersunk holes of the front fixing boss, the middle fixing boss and the rear fixing boss to fix them to the cross turntable column;

[0013] (2) Insert the large end of the T-shaped locating column into the mounting groove on the end face of the cross turntable column and make a transition assembly;

[0014] (3) Sleeve the center hole of the flange onto the small end of the T-shaped positioning column, first insert the positioning pin between the flange and the end face of the cross turntable column, and then fix the flange to the end face of the cross turntable column through four first countersunk bolts;

[0015] (4) Insert the small end of the T-shaped positioning column at the front end into the center hole of the CNC indexing turntable of the fourth axis of the CNC machine tool, and fix the flange at the front end to the CNC indexing turntable of the fourth axis of the machine tool through the front connecting bolts;

[0016] (5) Insert the small end of the T-shaped positioning column at the rear end into the center hole of the hydraulic disc brake tailstock, and the flange at the rear end is fixedly connected to the hydraulic disc brake tailstock through the rear connecting bolts;

[0017] (6) Assemble eight middle V-shaped blocks into the V-shaped grooves formed between eight adjacent groups of front clamping wedges and rear clamping wedges respectively, and fix the middle V-shaped blocks to the positioning base plate through the third countersunk bolts.

[0018] (7) The workpieces to be processed are placed one by one on the sixteen workpiece clamping stations formed between the front fixed boss and the front wedge-shaped expansion clamping device, between the front wedge-shaped expansion clamping device and the middle fixed boss, between the middle fixed boss and the rear wedge-shaped expansion clamping device, and between the rear wedge-shaped expansion clamping device and the rear fixed boss. The installation position of the workpiece to be processed is accurately installed under the positioning of two surfaces (the upper surface of the positioning base plate and the side surface of the fixed boss), and then the third countersunk bolt is tightened to reduce the distance between the middle V-block and the positioning base plate. The wedge surfaces on the front and rear sides of the middle V-block respectively produce forward and backward extrusion on the wedge surfaces of the front clamping wedge block and the rear clamping wedge block. The front side surface of the front clamping wedge block moves forward to clamp the rear side surface of one workpiece to be processed to fix it, and the rear side surface of the rear clamping wedge block moves backward to clamp the front side surface of another workpiece to be processed to fix it.

[0019] (8) Start the CNC machine tool. The fourth-axis CNC indexing turntable drives the entire fixture to rotate, and the CNC machine tool's tool processes the 16 workpieces to be processed in turn.

[0020] (9) After the processing is completed, turn off the CNC machine tool, loosen the third countersunk bolt, increase the distance between the middle V-block and the positioning base plate, and remove the processed workpiece.

[0021] The wedge-shaped expansion clamping device in the utility model locks the moving structure according to the principle of inclined plane wedging and spiral clamping. Because the self-locking mechanism used in the two-sided fixed inclined wedge clamp relies on the angle effect to increase the force, it is necessary to select and calculate the parameters such as the inclination angle value α of the front and rear sides of the center V-shaped block, the clamping force and the inclined wedge wedging force. When the clamping mechanism is loaded, the deformation and stress analysis are performed on it, and the strength and rigidity of the structure are checked according to the results of finite element analysis. The front clamping wedge block, the rear clamping wedge block and the positioning base plate are made of an integrated structure.

[0022] The chip grooves arranged between two adjacent rectangular planes on the cross turntable column play a good chip removal role during machining.

[0023] In summary, the fixture of the utility model is assembled by a split structure, with a compact structure, reliable connection, precise positioning, and the sixteen clamping stations greatly improve the processing efficiency. The utility model adopts a special fixture, a combined fixture, an integrated structure of a group fixture, and an adjustable component modularization to realize the fixture's "one machine, multiple sequences", "one machine, multiple positions", "one machine, multiple surfaces", strong adjustability, strong versatility, and high precision functions, which greatly improves the degree of flexibility. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a top view of the utility model;

[0025] Figure 2 It is an axial cross-sectional view of the utility model;

[0026] Figure 3 yes Figure 1 Left view of;

[0027] Figure 4 yes Figure 1 End view of the center cross turntable column. DETAILED DESCRIPTION

[0028] The implementation of the utility model is further described in detail below in conjunction with the drawings and examples.

[0029] like Figure 1-Figure 4 As shown, the sixteen-station fixture for CNC machine tools of the utility model comprises a cross turntable column 1, a front connection positioning assembly, a rear connection positioning assembly and four positioning base plates 2. The center line of the cross turntable column 1 is horizontally arranged along the front-to-back direction, the front connection positioning assembly is arranged at the front end face of the cross turntable column 1, and the rear connection positioning assembly is arranged at the rear end face of the cross turntable column 1. The outer circle of the cross turntable column 1 is evenly provided with four rectangular planes along the circumferential direction. The four positioning base plates 2 are respectively fixed on a rectangular plane. The surface of each positioning base plate 2 is provided with a front fixed boss 3, a front wedge-shaped expansion clamping device, a middle fixed boss 4, a rear wedge-shaped expansion clamping device and a rear fixed boss 5 in sequence from front to back. A workpiece clamping station 6 is formed between the front fixed boss 3 and the front wedge-shaped expansion clamping device, between the front wedge-shaped expansion clamping device and the middle fixed boss 4, between the middle fixed boss 4 and the rear wedge-shaped expansion clamping device, and between the rear wedge-shaped expansion clamping device and the rear fixed boss 5.

[0030] The front connection positioning assembly and the rear connection positioning assembly have the same structure and are symmetrical front to back. The center of the front end face and the rear end face of the cross turntable column 1 are both provided with a mounting groove 7. The front connection positioning assembly and the rear connection positioning assembly both include a flange 8 and a T-shaped positioning column (not shown). A through hole 9 is provided in the center of the flange 8. The large end of the T-shaped positioning column extends into and is transitionally assembled in the mounting groove 7. The flange 8 is fixedly connected to the end face of the cross turntable column 1 through four first countersunk bolts 10 and is installed in the through hole 9 extending from the small end of the T-shaped positioning column. A positioning pin shaft 11 is correspondingly inserted between the flange 8 and the end face of the cross turntable column 1.

[0031] The front flange 8 is connected to the fourth axis CNC indexing turntable (not shown) of the machine tool through the front connecting bolts (not shown), and the small end of the front T-shaped positioning column extends into the center hole of the fourth axis CNC indexing turntable;

[0032] The rear flange 8 is connected to the hydraulic disc brake tailstock (not shown) through rear connecting bolts (not shown), and the small end of the rear T-shaped positioning column extends into the center hole of the hydraulic disc brake tailstock.

[0033] The positioning base plate 2 is fixedly connected to the cross turntable column 1 through second countersunk bolts 12 which are countersunk inside the front fixing boss 3 , the middle fixing boss 4 and the rear fixing boss 5 .

[0034] The front wedge-shaped expansion clamping device and the rear wedge-shaped expansion clamping device have the same structure and are arranged symmetrically front to back. The front wedge-shaped expansion clamping device and the rear wedge-shaped expansion clamping device both include a front clamping wedge 13, a middle V-shaped block 14 and a rear clamping wedge 15. The front clamping wedge 13 and the rear clamping wedge 15 are both slidably connected to the positioning base plate 2. The front side surface of the front clamping wedge 13 and the rear side surface of the rear clamping wedge 15 are both planar structures perpendicular to the surface of the positioning base plate 2. A V-shaped groove is formed between the rear side surface of the front clamping wedge 13 and the front side surface of the rear clamping wedge 15. The middle V-shaped block 14 is assembled in the V-shaped groove, and the middle V-shaped block 14 is connected to the positioning base plate 2 by a third countersunk bolt 16.

[0035] A chip groove 19 is provided between two adjacent rectangular planes on the cross turntable column 1, the length direction of which is parallel to the center line of the cross turntable. The bottom profile of the cross section of the chip groove 19 is an arc with a central angle of 90°.

[0036] The specific steps of installing the fixture of the utility model on the CNC machine tool and processing the workpiece are as follows:

[0037] (1) Install the four positioning base plates 2 on the four rectangular planes of the cross turntable column 1 in a one-to-one correspondence, insert the second countersunk bolts 12 into the countersunk holes of the front fixing boss 3, the middle fixing boss 4 and the rear fixing boss 5 to fix them to the cross turntable column 1;

[0038] (2) Insert the large end of the T-shaped positioning column into the mounting groove 7 on the end surface of the cross turntable column 1 and make a transitional assembly;

[0039] (3) Sleeve the center hole of the flange 8 onto the small end of the T-shaped positioning column, first insert the positioning pin 11 between the flange 8 and the end surface of the cross turntable column 1, and then fix the flange 8 to the end surface of the cross turntable column 1 through four first countersunk bolts 10;

[0040] (4) Insert the small end of the T-shaped positioning column at the front end into the center hole of the CNC indexing turntable of the fourth axis of the CNC machine tool, and the flange plate 8 at the front end is fixedly connected to the CNC indexing turntable of the fourth axis of the machine tool through the front connecting bolts;

[0041] (5) Insert the small end of the rear T-shaped positioning column into the center hole of the hydraulic disc brake tailstock, and the rear flange 8 is fixedly connected to the hydraulic disc brake tailstock by the rear connecting bolts;

[0042] (6) The eight middle V-shaped blocks 14 are respectively assembled into the V-shaped grooves formed between the eight adjacent groups of front clamping wedges 13 and rear clamping wedges 15 . The middle V-shaped blocks 14 are fixedly connected to the positioning base plate 2 by the third countersunk bolts 16 .

[0043] (7) The workpieces 20 to be processed are placed one by one on the sixteen workpiece clamping stations 6 formed between the front fixed boss 3 and the front wedge-shaped expansion clamping device, between the front wedge-shaped expansion clamping device and the middle fixed boss 4, between the middle fixed boss 4 and the rear wedge-shaped expansion clamping device, and between the rear wedge-shaped expansion clamping device and the rear fixed boss 5. The installation position of the workpiece 20 to be processed is accurately installed under the positioning of two surfaces (the upper surface of the positioning base plate 2 and the side surface of the fixed boss), and then the third countersunk bolt 16 is tightened to reduce the distance between the middle V-block 14 and the positioning base plate 2. The wedge surfaces on the front and rear sides of the middle V-block 14 respectively produce forward and backward extrusion on the wedge surfaces of the front clamping wedge block 13 and the rear clamping wedge block 15. The front side surface of the front clamping wedge block 13 moves forward to clamp the rear side surface of one workpiece 20 to be processed to fix it, and the rear side surface of the rear clamping wedge block 15 moves backward to clamp the front side surface of another workpiece 20 to be processed to fix it.

[0044] (8) The CNC machine tool is started, and the fourth-axis CNC indexing turntable drives the entire fixture to rotate. The tool of the CNC machine tool processes the 16 workpieces 20 to be processed in sequence.

[0045] (9) After the processing is completed, the CNC machine tool is turned off, the third countersunk bolt 16 is loosened, the distance between the middle V-block 14 and the positioning base plate 2 is increased, and the processed workpiece is removed.

[0046] The above embodiments illustrate the basic principles and features of the utility model, but the above only illustrates the preferred embodiments of the utility model and is not limited by the embodiments. Under the inspiration of this patent, ordinary technicians in this field can also make many forms of deformation and improvement without departing from the purpose of the utility model and the scope of protection of the claims, which are all within the scope of protection of the utility model. Therefore, the patent and protection scope of the utility model shall be subject to the attached claims.

Claims

1. Sixteen-station fixture for CNC machine tools, characterized by: It includes a cross turntable column, a front connecting positioning component, a rear connecting positioning component and four positioning base plates. The center line of the cross turntable column is horizontally arranged along the front and rear directions. The front connecting positioning component is arranged at the front end face of the cross turntable column, and the rear connecting positioning component is arranged at the rear end face of the cross turntable column. The outer circle of the cross turntable column is evenly provided with four rectangular planes along the circumferential direction. The four positioning base plates are respectively fixed on a rectangular plane. The surface of each positioning base plate is provided with a front fixed boss, a front wedge-shaped expansion clamping device, a middle fixed boss, a rear wedge-shaped expansion clamping device and a rear fixed boss in sequence from front to back. Workpiece clamping stations are formed between the front fixed boss and the front wedge-shaped expansion clamping device, between the front wedge-shaped expansion clamping device and the middle fixed boss, between the middle fixed boss and the rear wedge-shaped expansion clamping device, and between the rear wedge-shaped expansion clamping device and the rear fixed boss.

2. The sixteen-station fixture for CNC machine tools according to claim 1, characterized in that: The front connection positioning assembly and the rear connection positioning assembly have the same structure and are symmetrical front to back. The centers of the front and rear ends of the cross turntable column are provided with mounting grooves. The front connection positioning assembly and the rear connection positioning assembly both include a flange and a T-shaped positioning column. A through hole is provided in the center of the flange. The large end of the T-shaped positioning column extends into and is transitionally assembled in the mounting groove. The flange is fixedly connected to the end face of the cross turntable column by four first countersunk bolts and is installed in the through hole extending from the small end of the T-shaped positioning column. Positioning pins are correspondingly inserted between the flange and the end face of the cross turntable column. The front flange is connected to the fourth axis CNC indexing turntable of the machine tool through the front connecting bolts, and the small end of the front T-shaped positioning column extends into the center hole of the fourth axis CNC indexing turntable; The flange at the rear end is connected to the hydraulic disc brake tail seat through the rear connecting bolts, and the small end of the T-shaped positioning column at the rear end extends into the center hole of the hydraulic disc brake tail seat.

3. The sixteen-station fixture for CNC machine tools according to claim 1, characterized in that: The positioning base plate is fixedly connected with the cross turntable column through second countersunk bolts which are countersunk inside the front fixing boss, the middle fixing boss and the rear fixing boss.

4. The sixteen-station fixture for CNC machine tools according to claim 1, characterized in that: The front wedge-shaped expansion clamping device and the rear wedge-shaped expansion clamping device have the same structure and are arranged symmetrically front to back. The front wedge-shaped expansion clamping device and the rear wedge-shaped expansion clamping device both include a front clamping wedge, a middle V-shaped block and a rear clamping wedge. The front clamping wedge and the rear clamping wedge are both slidably connected to the positioning base plate. The front side surface of the front clamping wedge and the rear side surface of the rear clamping wedge are both planar structures perpendicular to the surface of the positioning base plate. A V-shaped groove is formed between the rear side surface of the front clamping wedge and the front side surface of the rear clamping wedge. The middle V-shaped block is assembled in the V-shaped groove, and the middle V-shaped block is connected to the positioning base plate by a third countersunk bolt.

5. The sixteen-station fixture for CNC machine tools according to any one of claims 1 to 4, characterized in that: A chip groove with a length direction parallel to the center line of the cross turntable is provided between two adjacent rectangular planes on the cross turntable column, and the bottom profile of the cross section of the chip groove is an arc with a central angle of 90 degrees.

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