Centering vise that can be changed to multiple processing stations and its wedge-shaped retainer

Abstract

To provide a centering vise and its wedge-shaped cleaner that can be changed to a plurality of types of processing stations. [Solution] A centering vise A provides various clamping modes for single or multiple workpieces for processing, thereby improving workpiece processing efficiency. An intermediate block 2 and two clamps 3 are provided on a base 1, and two second fixed blocks 32 are connected to them. The two second fixed blocks are placed in accommodation grooves 12 provided in the base, and then attached to both ends of a transmission screw 4, respectively. At least one wedge-shaped retainer 5 can also be attached to the base, allowing multiple workpieces to be clamped and processed.

Description

[Technical Field]

[0001] The present invention relates to the technical field of machining, and in particular to the technical field of centering vises used as attachments to machine tools. [Background technology]

[0002] Driven by modern manufacturing trends such as "production automation," "simultaneous machining of multiple workpieces," and "increased machine utilization," multi-station vises are becoming more and more widely used in today's machining fields.

[0003] Generally, as disclosed in Chinese Utility Model No. CN216464052U "Multi-Station Vise," a multi-station vise has a base on which a plurality of wedge-shaped retainers (OK-VISE) are alternately mounted between a plurality of fixed seats, and by tightening the bolts of each of the wedge-shaped retainers, two clamp blocks are driven to clamp a plurality of workpieces.

[0004] However, when the existing wedge-shaped retainer is removed from the base of the vise, its components are separate and not connected together, so it is easy to lose the V-shaped block, the two clamp blocks, etc., and if they are lost, the multi-station vise often loses its ability to clamp the workpiece.

[0005] Furthermore, existing multi-station vises are limited in their flexibility of use because they are limited in the number and size of workpieces they can process at one time. In particular, the mounting position of existing wedge-shaped retainers is fixed and cannot be changed. In other words, existing multi-station vises can only be used to process workpieces of one size. This means that operators must prepare multiple multi-station vises to process workpieces of different sizes, which goes against the principle of economy. Summary of the Invention [Problem to be solved by the invention]

[0006] In view of the lack of flexibility in the use of existing multi-station vises, the present inventors have made great efforts to develop a centering vise and its wedge-shaped retainer that can be converted to multiple processing stations according to the present invention. Therefore, a primary object of the present invention is to provide an economical and affordable centering vise that can be converted to multiple processing stations. A secondary object of the present invention is to provide a wedge-shaped retainer that can be modularized and whose mounting position can be freely moved and changed. Another object of the present invention is to provide a centering vise that can be converted to multiple processing stations, allowing for convenient and quick workpiece clamping operations. A further object of the present invention is to provide a wedge-shaped retainer that is less likely to lose clamping force. [Means for solving the problem]

[0007] To achieve the above object, the present invention provides the following technical means: a wedge-shaped retainer, comprising: a V-shaped block having a through hole in a main body and guide posts on both sides of the main body, two clamp blocks disposed on both sides of the V-shaped block and each having a guide groove corresponding to the guide posts on both sides of the main body, and two elastic members connected between the two clamp blocks.

[0008] The wedge-shaped retainer further includes a first fixing block, a bolt, an elastic washer, and a compression spring. The first fixing block is a T-shaped block, i.e., a first wing portion is provided on each side of the block body, and a screw hole is provided at the upper end of the block body. The bolt passes through the elastic washer, the through hole provided in the V-shaped block, and the compression spring in that order, and is connected to the screw hole of the first fixing block.

[0009] Each of the two elastic members includes two protective tubes, two tension springs, and four hanging members. Both ends of the two protective tubes are inserted into four countersunk holes in four ear blocks provided on the two clamp blocks. The four hanging members are positioned outside the four countersunk holes to hook the two tension springs.

[0010] Each of the four hanging members has a head portion and a stepped rod extending from the head portion, the stepped rod having a hook hole, the head portion having a gut surface, the outer end surface of each of the head portions being flush with the clamping surfaces of the two clamping blocks or not protruding from the clamping surfaces of the two clamping blocks, the through hole in the V-shaped block being an elongated fisheye hole, and the clamping surfaces of the two clamping blocks each having a tooth surface.

[0011] The wedge-shaped retainer further includes at least one jaw plate, a pad assembly, and two dust scrapers, wherein the at least one jaw plate is connected to the outside of the two clamp blocks, and the tooth surfaces are provided on clamping surfaces of the at least one jaw plate, the pad assembly is provided on lower end surfaces of the two clamp blocks, and the two dust scrapers are provided on upper surfaces of the two clamp blocks.

[0012] The present invention provides a centering vise that can be changed into a plurality of processing stations, comprising a base, two clamps, a transmission screw, and at least one wedge-shaped retainer, wherein the base has a slide rail on the upper surface of the base body, a receiving groove on the abdominal part of the base body, and two mating grooves facing each other, the two clamps are provided on both sides of the base, and the two clamps each have a movable block, a second fixed block, and a fastener, the movable block is placed on the slide rail of the base, and the second fixed block is disposed inside the receiving groove of the base and is provided in the receiving groove. the fastener passes through the movable block and is connected to the second fixed block; the transmission screw is disposed inside the receiving groove of the base, and both ends of the transmission screw are connected to the second fixed block provided on each of the clamps; the at least one wedge-shaped retainer uses the wedge-shaped retainer according to any one of claims 1 to 5; a first fixed block provided on at least the wedge-shaped retainer is also disposed in the receiving groove; a first wing portion provided on at least the wedge-shaped retainer is fitted into the two receiving grooves; and the at least one wedge-shaped retainer is connected to the slide rail of the base by the bolt.

[0013] The second fixed block is a cross-shaped block having two second wing portions, which are fitted into the two fitting grooves, and the length by which the first fixed block enters the accommodating groove is shorter than the length by which the second fixed block enters the accommodating groove.

[0014] The transmission screw is provided with a first external thread and a second external thread having different transmission directions, and both ends of the transmission screw are hexagonal.

[0015] The centering vise, which can be changed to multiple types of processing stations, further includes an intermediate block provided at the intermediate position of the slide rail of the base, the intermediate block being connected to two screw holes provided at the intermediate position of the slide rail by two screws, a recessed groove corresponding to the slide rail being provided at the bottom of the intermediate block, and a slide groove corresponding to the slide rail being provided in each of the movable blocks.

[0016] The base has a scale, a long groove and a plurality of screw holes on both sides thereof, and a positioner is attached to each screw hole. [Effects of the Invention]

[0017] Therefore, by adopting the above technical means, the present invention has the following advantages over the prior art.

[0018] 1. By combining the two clamps on the base with at least one wedge-shaped retainer and / or the intermediate block, the present invention realizes a centering vise that can be changed to multiple processing stations, and can provide 1 to 16 or more processing stations. The multi-station vise is not limited to processing only one size of workpiece, and is highly flexible in use, allowing one vise to be used as multiple vises.

[0019] 2. The wedge-shaped retainer of the present invention can be positioned at any position on the slide rail of the base using the bolt and the first fixed block to clamp the workpiece, thereby realizing a centering vise that can be changed to multiple processing stations. Furthermore, the wedge-shaped retainer of the present invention can be modularized by integrally connecting the V-shaped block and the two clamping blocks using the two elastic members and the guide grooves and guide posts between the V-shaped block and the two clamping blocks. In other words, the wedge-shaped retainer can maintain its assembled state even when not in use, making it less likely for components to be lost.

[0020] 3. The centering vise of this invention uses at least one wedge-shaped retainer and at least one positioner is installed on the side of the base. In other words, the clamping surfaces of the two clamps serve as the reference surfaces for positioning and clamping the workpiece. If necessary, at least one positioner can be used to position another reference surface of the workpiece (a surface other than the clamping surface). In other words, by simply operating the transmission screw, each of the fasteners, each of the bolts, each of the screws, or a combination thereof, all workpieces can be quickly clamped and positioned for processing, improving work efficiency.

[0021] 4. The bolt of the wedge-shaped retainer of the present invention, when used in conjunction with the elastic washer and the compression spring, can be prevented from loosening and detaching during processing, thereby reducing the clamping force on the base and the workpiece. [Brief explanation of the drawings]

[0022] [Figure 1] 1 is a perspective view of a centering vise according to the present invention; [Figure 2] 1 is an exploded perspective view of a centering vise according to the present invention; [Figure 3] 1 is a longitudinal sectional view of a centering vise according to the present invention; [Figure 4] 1 is a perspective view of a wedge-shaped retainer according to the present invention; [Figure 4-1] 1 is an exploded view of another embodiment of the wedge-shaped retainer of the present invention; [Figure 5] 1 is an exploded perspective view of a wedge-shaped retainer according to the present invention; [Figure 6] FIG. 4 is an enlarged view of the wedge-shaped retainer of FIG. 3 according to the present invention. [Figure 6-1] 4 is a cross-sectional view of an elastic member provided in the wedge-shaped retainer of the present invention; FIG. [Figure 7] FIG. 4 is a cross-sectional view of the present invention taken along line aa in FIG. [Figure 8] FIG. 4 is a cross-sectional view taken along line bb in FIG. 3 of the present invention. [Figure 9] 1 is a view showing one embodiment of the present invention for clamping a workpiece. FIG. [Figure 10] 1 is a view showing an embodiment of the present invention for clamping two workpieces; FIG. [Figure 11] 1 is a diagram showing an embodiment of the present invention for clamping two large-volume workpieces; FIG. [Figure 12] 1 is a diagram showing an embodiment of the present invention for clamping three workpieces. [Figure 13] 1 is a view showing an embodiment of the present invention for clamping four workpieces; FIG. [Figure 14] 1 is a view showing an embodiment of the present invention for clamping four long workpieces. [Figure 15] 1 is a diagram showing an embodiment of the present invention for clamping 16 long workpieces. DETAILED DESCRIPTION OF THE INVENTION

[0023] The present invention relates to a centering vise and its wedge-shaped retainer that can be changed to multiple processing stations, and as shown in Figure 1, it performs processing by providing multiple clamping modes for one or multiple workpieces, and the centering vise A that can be changed to multiple processing stations includes a base 1, an intermediate block 2, two clamps 3, a transmission screw 4, at least one wedge-shaped retainer 5, or a combination thereof. These will be described in detail below.

[0024] 2, 3 and 15, the base 1 has a slide rail 11 on the upper surface of a base body 10, a housing groove 12 on the abdominal part of the base body 10, and two opposing fitting grooves 13 in the housing groove 12. A scale 15, a long groove 16 and a plurality of connecting screw holes 17 are provided on each side of the base 1, a pressure plate 94 is attached to each of the long grooves 16, and a positioner 6 is attached to each of the connecting screw holes 17.

[0025] 2 and 3, the intermediate block 2 is fixedly mounted at the middle position of the slide rail 11 of the base 1, and a groove 21 is formed in the bottom of the intermediate block 2, and the intermediate block 2 is fixed to two screw holes 14 formed at the middle position of the slide rail 11 by two screws 22. If necessary, the intermediate block 2 can be temporarily removed and not used.

[0026] As shown in FIGS. 2, 3, and 7, the two clamps 3 are arranged on both sides of the base 1. Each of the two clamps 3 includes a movable block 31, a second fixed block 32, and a fastener 33. A slide groove 311 for mounting on the slide rail 11 of the base 1 is provided at the bottom of each movable block 31. Each of the second fixed blocks 32 is arranged inside the accommodating groove 12 of the base 1. Each of the second fixed blocks 32 is a cross-shaped block body having two second wing portions 321, which are fitted into two fitting grooves 13 of the accommodating groove 12. Each of the fasteners 33 passes through the movable block 31 and is then connected to a screw hole provided on the top surface of each of the second fixed blocks 32. When each fastener 33 is tightened with a tool, each second fixing block 32 moves upward, and the two second wing portions 321 clamp the inner walls of the upper surfaces of the two fitting grooves 13, fixing the two clamps 3 in a predetermined position on the slide rail 11 of the base 1.

[0027] 2 and 3, the transmission screw 4 is disposed inside the receiving groove 12 of the base 1. The transmission screw 4 is provided with a first external thread 41 and a second external thread 42 which transmit in different directions, and the first external thread 41 and the second external thread 42 are respectively connected to the internal threads of the second fixed blocks 32 provided on each of the clamps 3. In addition, both ends of the transmission screw 4 are hexagonal portions 43, and by rotating the transmission screw 4 via the hexagonal portions 43 with a tool, the two second fixed blocks 32 are driven, and the two clamps 3 slide toward or away from each other on the slide rails 11 of the base 1 in an interlocking manner.

[0028] As shown in FIGS. 2 to 6-1 and 8, the at least one wedge-shaped retainer 5 includes a first fixing block 50, a bolt 51, a V-shaped block 52, two clamp blocks 53, two elastic members 54, two protective tubes 55, an elastic washer 56, and a compression spring 57. The V-shaped block 52 has a through hole 521, which is preferably an elongated fisheye hole. The two clamp blocks 53 are disposed on both sides of the V-shaped block 52, and the outer clamping surfaces of each of the two clamp blocks 53 are provided with toothed surfaces 535 to increase the clamping force. The two elastic members 54 are connected between four lug blocks 532 provided on the two clamp blocks 53, and protective tubes 55 are attached to the exteriors of the two elastic members 54 to protect the members. Furthermore, the two elastic members 54 each include two tension springs 541 and four hanging members 542. Both ends of the two protective tubes 55 are inserted into four countersunk holes 533 of four lug blocks 532 provided on the two clamp blocks 53. The four hanging members 542 are disposed outside the four countersunk holes 533 to hook the two tension springs 541. Each of the four hanging members 542 includes a head portion 543 and a stepped rod 544 extending from the head portion 543, and the stepped rod 544 is provided with a hooking hole 545 for hooking one end of each tension spring 541. The head portion 543 is provided with a cut surface 546 to prevent each tension spring 541 from twisting when the head portion 543 rotates. The outer end surface of each head portion 543 is flush with the clamping surface of the two clamp blocks 53 or does not protrude beyond the clamping surface. The bolt 51 passes through the elastic washer 56, the through hole 521 in the V-shaped block 52, and the compression spring 57 in that order from top to bottom, and then is connected to the screw hole 502 in the first fixed block 50.In other words, the elastic washer 56 and the compression spring 57 can prevent the bolt 51 from loosening and coming off when the workpiece 7 is machined while the bolt 51 is tightened, thereby preventing the clamping force on the fitting groove 13 of the base 1 of the wedge-shaped retainer 5 and the workpiece 7 from loosening.

[0029] 3, 6 and 8, the first fixed block 50 is disposed in the receiving groove 12 of the base 1, and the first fixed block 50 has two first wings 501 on both sides of a block body 500 to form a T-shaped block body, and the two first wings 501 are fitted into the two fitting grooves 13. In order to avoid interference with the transmission screw 4 when the first fixed block 50 is attached, the length by which the first fixed block 50 enters the receiving groove 12 needs to be shorter than the length by which the second fixed block 32 enters the receiving groove 12.

[0030] In addition, guide posts 522 and guide grooves 531 are provided between the inclined surfaces on both sides of the V-shaped block 52 and the two clamp blocks 53. As a result, when the bolt 51 is tightened, the first fixed block 50 moves upward, and the two first wing portions 501 clamp the inner walls of the upper surfaces of the two fitting grooves 13, fixing the wedge-shaped retainer 5 to the slide rail 11 of the base 1. The inclined surfaces on both sides of the V-shaped block 52 are used to push and move the two clamp blocks 53 outward, thereby achieving the purpose of clamping the workpieces 7 located on both sides of the wedge-shaped retainer 5. When the bolt 51 is loosened, the restoring forces of the two elastic members 54 cause the two clamp blocks 53 to move inward, and the inclined surfaces push and move the V-shaped block 52 upward. The external thread of the bolt 51 moves the first fixing block 50 downward, completely releasing the clamping force of the wedge-shaped retainer 5. Meanwhile, the wedge-shaped retainer 5 of the present invention can be modularized by integrally connecting the V-shaped block 52 and the two clamp blocks 53 using the two elastic members 54 provided thereon and the guide groove 531 and guide post 522 provided between the V-shaped block 52 and the two clamp blocks 53. In other words, the wedge-shaped retainer 5 can maintain its assembled state even when not in use, making it less likely that components will be lost.

[0031] As shown in FIG. 4-1 , a wedge-shaped retainer 5a according to another embodiment of the present invention is different from the wedge-shaped retainer 5 described above in that it additionally includes at least one jaw plate 534, a pad assembly 58, and two dust scrapers 59. The jaw plate 534 is attached to the outside of the two clamp blocks 53 with a plurality of screws, and the clamping surface of the jaw plate 534 is provided with the toothed surface 535. The pad assembly 58 is attached to the bottom surfaces of the two clamp blocks 53 with a plurality of screws, and the two dust scrapers 59 are attached to the top surfaces of the two clamp blocks 53 with a plurality of screws. Whether the jaw plate 534 and the pad assembly 58 are added depends on the size of the workpiece to be clamped. The two dust scrapers 59 prevent dust from entering the contact surface between the V-shaped block 52 and the two clamp blocks 53, preventing excessive wear due to friction with the dust.

[0032] Therefore, the present invention provides a preferred solution for a centering vise that can be converted to multiple processing stations, and the centering vise A that can be converted to multiple processing stations can clamp and process workpieces in various ways in a centering vise that can be converted to a single or multiple processing stations by combining the two clamps 3 of the base 1 with the at least one wedge-shaped retainer 5 and / or the intermediate block 2.

[0033] 9, the present invention provides an embodiment in which the centering vise A, which can be changed to a plurality of machining stations by temporarily removing the intermediate block 2 and the at least one wedge-shaped retainer 5, is configured as a centering vise and clamps and processes a single workpiece 7. That is, first, the fasteners 33 of the two clamps 3 are loosened, and then the transmission screw 4 is rotated to slide the two clamps 3 close to each other on the slide rail 11 of the base 1 to clamp the single workpiece 7, and then the fasteners 33 are tightened to position and fix the two clamps 3, thereby clamping and processing the workpiece 7.

[0034] As shown in FIG. 10, by replacing the intermediate block 2 with the wedge-shaped retainer 5, an embodiment can be provided in which two workpieces 7 are clamped and machined. First, the transmission screw 4 is rotated to slide the two clamps 3 toward or away from each other, thereby adjusting the reference plane for clamping and positioning the two workpieces 7, and then the fasteners 33 are tightened to position and fix the two clamps 3. Next, the wedge-shaped retainer 5 is tightened with the bolt 51, and the V-shaped block 52 is pressed down, thereby expanding and displacing the two clamp blocks 53 laterally, thereby clamping and machining the two workpieces 7. If the width of the two workpieces 7a is large, as shown in FIG. 11, two centering vises A, which can be changed to multiple machining stations according to the present invention, can be used side by side to fix, clamp, and machine the two workpieces 7a.

[0035] As shown in Fig. 12, by replacing the intermediate block 2 with two of the wedge-shaped retainers 5, an embodiment is provided in which three workpieces 7 are clamped and machined. First, the transmission screw 4 is rotated to slide the two clamps 3 toward or away from each other, thereby adjusting the reference plane for clamping and positioning the three workpieces 7. Next, the two wedge-shaped retainers 5 are tightened with the bolts 51, and the V-shaped block 52 is pressed down, thereby expanding and displacing the two clamp blocks 53 laterally, and the three workpieces 7 are clamped and machined.

[0036] Similarly, as shown in FIG. 13, an embodiment is provided in which four workpieces 7 are clamped and machined by combining the intermediate block 2 and two wedge-shaped retainers 5. First, the transmission screw 4 is rotated to slide the two clamps 3 toward or away from each other, adjusting the reference plane for clamping and positioning the four workpieces 7. Next, the two wedge-shaped retainers 5 are tightened with the bolts 51, and the V-shaped block 52 is pressed down, causing the two clamp blocks 53 to expand and displace laterally, thereby clamping and machining the four workpieces 7. If the four workpieces 7 are long workpieces 7a, as shown in FIG. 14, two centering vises A convertible to multiple machining stations according to the present invention are used side by side to fix, clamp, and machine the four workpieces 7a.

[0037] FIG. 15 shows another embodiment of the present invention, which includes a base 8 having a plurality of connecting holes 81 adjacent to the outer periphery, a pillar 9 having a bottom attached to the base 8, the pillar 9 having a plurality of connecting surfaces 91, preferably two to eight connecting surfaces 91, each having a plurality of connecting screw holes 92, and a plurality of centering vises, which are centering vises A of the present invention that can be changed to a plurality of processing stations, and the plurality of centering vises are attached vertically in a line to the plurality of connecting surfaces 91 provided on the pillar 9 by a plurality of connecting screws 93 and a pressure plate 94, allowing a larger number of long workpieces 7a to be clamped and processed. [Explanation of symbols]

[0038] A: A centering vise that can be changed to multiple processing stations 1: Bass 10: Base body 11: Slide rail 12: Storage groove 13:Mating groove 14:Screw hole 15: Scale 16: Nagamizo 17: Connection screw hole 2: Intermediate block 21: Groove 22: Screw 3: Clamp 31: Movable block 311: Slide groove 32: Second fixed block 321: Second wing 33: Zipper 4: Transmission screw 41: First external screw 42: Second external screw 43:Hexagonal part 5, 5a: Wedge-shaped retainer 50: First fixed block 500: Block body 501: First wing 502: screw hole 51: Bolt 52: V-shaped block 521:Through hole 522: Guidepost 53: Clamp block 531: Guide groove 532: Ear Block 533: Countersunk hole 534: Jaw plate 545: Tooth surface 54: Elastic member 541: Tension spring 542: Hanging member 543: Head 544: Stepped rod 545: Hook hole 546: Cut surface 55: Protection tube 56: Elastic washer 57: Compression spring 58: Pad assembly 59: Dust-proof scraper 6: Positioner 7: Work 7a: Work 8: Base 81: Binding hole 9: Pillar 91: Bonding surface 92: Connection screw hole 93: Coupling screw 94: Pressure plate

Claims

1. A wedge-shaped retainer, a V-shaped block having a through hole in a main body and a guide post on each side of the main body; two clamp blocks arranged on both sides of the V-shaped block, each having a guide groove corresponding to the guide posts on both sides of the main body; and two resilient members connected between the two clamp blocks.

2. a first fixing block, a bolt, an elastic washer, and a compression spring; 2. The wedge-shaped retainer according to claim 1, wherein the first fixing block is a T-shaped block, i.e., a first wing portion is provided on each side of a block body, a screw hole is provided at an upper end of the block body, and the bolt passes through the elastic washer, the through hole provided in the V-shaped block, and the compression spring in this order, and is connected to the screw hole of the first fixing block.

3. 3. The wedge-shaped retainer according to claim 2, wherein each of the two elastic members includes two protective tubes, two tension springs, and four hook members, and both ends of the two protective tubes are fitted into four countersunk holes of four ear blocks provided on the two clamp blocks, and the four hook members are positioned outside the four countersunk holes to hook the two tension springs.

4. 4. The wedge-shaped retainer of claim 3, wherein each of the four hanging members comprises a head portion and a stepped rod extending from the head portion, the stepped rod having a hook hole, the head portion having a gut surface, the outer end surface of each of the head portions being flush with the clamping surfaces of the two clamping blocks or not protruding from the clamping surfaces of the two clamping blocks, the through hole provided in the V-shaped block being an elongated fisheye hole, and the clamping surfaces of the two clamping blocks each having a tooth surface.

5. 5. The wedge-shaped retainer of claim 4, further comprising at least one jaw plate, a pad assembly, and two dust scrapers, wherein the at least one jaw plate is coupled to the outside of the two clamp blocks, and the tooth surfaces are provided on clamping surfaces of the at least one jaw plate, the pad assembly is provided on lower end surfaces of the two clamp blocks, and the two dust scrapers are provided on upper surfaces of the two clamp blocks.

6. A centering vise that can be changed into a plurality of processing stations, comprising a base, two clamps, a transmission screw, and at least one wedge-shaped retainer, The base has a slide rail on an upper surface of a base body, an accommodation groove on an abdominal portion of the base body, and two mating grooves facing each other in the accommodation groove; The two clamps are provided on both sides of the base, and each of the two clamps includes a movable block, a second fixed block, and a fastener, the movable block is placed on a slide rail of the base, the second fixed block is disposed in the receiving groove of the base, and is fitted into the two fitting grooves provided in the receiving groove, and the fastener passes through the movable block and is connected to the second fixed block; the transmission screw is disposed within the receiving groove of the base, and both ends thereof are respectively connected to the second fixing blocks provided on each of the clamps; A centering vise that can be changed into multiple types of processing stations, wherein the at least one wedge-shaped retainer uses the wedge-shaped retainer described in any one of claims 1 to 5, a first fixed block provided on the at least wedge-shaped retainer is also placed in the accommodating groove, first wing portions provided on the at least wedge-shaped retainer are fitted into the two fitting grooves, and the at least one wedge-shaped retainer is connected to a slide rail of the base by the bolt.

7. 7. A centering vise that can be changed to multiple types of processing stations as described in claim 6, wherein the second fixed block is a cross-shaped block having two second wing portions, the two second wing portions are fitted into the two fitting grooves, and the length by which the first fixed block enters the accommodating groove is shorter than the length by which the second fixed block enters the accommodating groove.

8. 7. The centering vise changeable to a plurality of machining stations according to claim 6, wherein the transmission screw has a first external thread and a second external thread with different transmission directions, and both ends of the transmission screw are hexagonal.

9. 7. A centering vise that can be changed into multiple types of processing stations as described in claim 6, further comprising an intermediate block provided at an intermediate position of the slide rail of the base, the intermediate block being connected to two screw holes provided at the intermediate position of the slide rail by two screws, a recessed groove corresponding to the slide rail being provided at the bottom of the intermediate block, and a slide groove corresponding to the slide rail being provided in each of the movable blocks.

10. 7. The centering vise changeable to a plurality of processing stations according to claim 6, wherein a scale, a long groove and a plurality of coupling screw holes are provided on both sides of the base, and a positioner is attached to each of the coupling screw holes.

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