Fixture for forming coolant channels in a collet

Abstract

This promotes the efficiency of forming coolant channels in the collet. [Solution] The fixture has a main body, at least two positioning assemblies, and at least two alignment units. The main body has at least two mounting portions, each mounting portion having an engagement hole and an alignment hole communicating with the engagement hole. The positioning assemblies are respectively mounted to the mounting portions. Each positioning assembly has a mounting portion which is mounted to the corresponding mounting portion. The alignment units are respectively mounted to the mounting portions and inserted into the positioning assemblies. Each alignment unit has an alignment plate. The alignment plate of each alignment unit passes through the corresponding mounting portion, passes through the corresponding mounting portion of the positioning assembly, enters the mounting portion, and fits into a slot of a collet received in the mounting portion. The fixture can hold at least two collets.

Description

[Technical Field]

[0001] The present invention relates to a fixture, and more particularly to a fixture for clamping a collet to form coolant channels in the collet. [Background technology]

[0002] When machining a workpiece, the collet received in the cutter holder clamps the cutter, and then the cutter holder, collet, and cutter are driven by a spindle and rotated at high speed to cut the workpiece. The cutter rotating at high speed rubs against the workpiece, generating heat. To extend the life of the cutter and ensure the machining quality of the workpiece, the collet that clamps the cutter has a coolant channel for supplying coolant. Therefore, the coolant can be guided to the cutter to lower the cutter's temperature.

[0003] To form the coolant channels in the collet, a fixture is attached to the worktable of the machining device. The cutter holder is then assembled to the fixture along with the collet. The spindle machines the collet to form the coolant channels in the collet. Summary of the Invention [Problem to be solved by the invention]

[0004] However, the conventional fixture can only hold one cutter holder with one collet at a time. After the coolant channels are formed in the collet, another cutter holder with a different collet is assembled into the conventional fixture for machining. With the conventional fixture, the operator must repeatedly assemble the cutter holder with the collet. This is physically demanding, and the formation of the coolant channels in the collet is inefficient.

[0005] To overcome the shortcomings of conventional fasteners, the present invention provides a fastener that reduces or avoids the aforementioned problems. [Means for solving the problem]

[0006] The main object of the present invention is to provide a fixture for clamping at least two collets to facilitate the efficiency of forming coolant channels in the at least two collets.

[0007] The fixture includes a main body, at least two positioning assemblies, and at least two alignment units. The main body has at least two mounting portions, each having an engagement hole and an alignment hole communicating with the engagement hole. The positioning assemblies are respectively mounted to the mounting portions. Each positioning assembly has a mounting portion that is mounted to a corresponding one of the mounting portions. The alignment units are respectively assembled to the mounting portions and inserted into the positioning assemblies. Each alignment unit has an alignment plate. The alignment plate of each alignment unit passes through a corresponding one of the mounting portions, passes through a corresponding one of the mounting portions of the positioning assemblies, enters the mounting portion, and fits into a slot of a collet received in the mounting portion. The fixture of this utility model can hold at least two collets simultaneously, thereby improving the efficiency of forming coolant channels.

[0008] Other objects, advantages and novel features of the utility model will become more apparent from the following detailed description when considered in conjunction with the accompanying drawings. [Brief explanation of the drawings]

[0009] [Figure 1] 1 is a perspective view of a work table equipped with a fixture according to the present invention; [Figure 2] FIG. 2 is an exploded perspective view of the fixture of FIG. 1. [Figure 3] FIG. 3 is a perspective view of the main body of the fixture of FIG. 2. [Figure 4] FIG. 4 is a top view of the main body of FIG. 3. [Figure 5] FIG. 3 is an enlarged partial perspective view of the main body of FIG. 2. [Figure 6]FIG. 2 is a perspective view of a mounting portion of the fixture of FIG. 1. [Figure 7] FIG. 3 is an enlarged, partial cross-sectional side view of the fixture of FIG. 2. [Figure 8] 2 is a perspective view of the work table with the fixture according to the invention of FIG. 1, showing the work table with the fixture cooperating with the spindle; [Figure 9] 2 is another perspective view of the work table with the fixture according to the present invention in FIG. 1, showing the work table with the fixture cooperating with the spindle; DETAILED DESCRIPTION OF THE INVENTION

[0010] Referring to FIGS. 1 and 2, the fixture has a main body 10, six positioning assemblies 20, and six alignment units 30. 1 to 4, the main body 10 has a shape similar to a triangular frustum, and includes three blocks 11 and six mounting portions 12. The three blocks 11 are arranged at equal angles. Each block 11 has a slope 111. The slope 111 of each block 11 extends diagonally downward from the center of the main body 10 to the edge of the main body 10.

[0011] 1 to 4, the six assembly portions 12 are divided into three pairs of assembly portions arranged on three blocks 11, respectively. Each block 11 has two of the assembly portions 12. The two assembly portions 12 in each block 11 are arranged along the slope 111 of the block 11 with a gap between them. Each assembly portion 12 in each block 11 has a positioning pit 121, an engagement hole 122, and an alignment hole 123.

[0012] 1 to 4, in each assembly portion 12 of each block 11, a positioning pit 121 is formed perpendicular to the inclined surface 111 of the block 11 and has a substantially rectangular outline, a bottom surface 124 parallel to the inclined surface 111, and two abutment surfaces 125 facing each other on both sides of the positioning pit 121, the engagement hole 122 is formed perpendicular to the bottom surface 124 of the positioning pit 121 and has a round outer shape, and the alignment hole 123 is formed through the side surface of the block 11, communicates laterally with the engagement hole 122, and has a female thread.

[0013] 1, 2, and 7, six positioning assemblies 20 are detachably assembled to six mounting portions 12, respectively. Each positioning assembly 20 has a mounting portion 21 and a cover 22. The mounting portion 21 of each positioning assembly 20 has a flange 211 and a through hole 215. The mounting portion 21 also has a threaded portion 212, an engagement portion 213, and a collet receiving hole 214, which are coaxial with one another.

[0014] 1 to 7, the flange 211 of the mounting portion 21 of each positioning assembly 20 has an outer shape corresponding to the outer shape of the positioning pit 121 of each mounting portion 12. The flange 211 of the mounting portion 21 of each positioning assembly 20 is similarly rectangular and has two abutment surfaces 216, which are located on two opposite sides of the flange 211 and face away from each other.

[0015] The threaded portion 212 and the engaging portion 213 of the mounting portion 21 are respectively located on two opposing surfaces of the flange 211 of the mounting portion 21 and extend in opposite directions. The threaded portion 212 has a male thread. The engaging portion 213 has an outer shape corresponding to the outer shape of the engaging hole 122 of each assembly portion 12. The collet receiving hole 214 is disposed within the mounting portion 21 and extends to the threaded portion 212 and the engaging portion 213 of the mounting portion 21. The through holes 215 of the mounting portion 21 are formed radially, penetrating the engaging portion 213 in the radial direction, and connect to the collet receiving hole 214 of the mounting portion 21.

[0016] 1, 2 and 7, the mounting portion 21 of each positioning assembly 20 is detachably assembled to a corresponding one of the assembly portions 12. The flange 211 of the mounting portion 21 engages with the positioning pit 121 of the assembly portion 12, and the two abutment surfaces 216 of the flange 211 abut against the two abutment surfaces 125 of the positioning pit 121 of the assembly portion 12, respectively. The engagement portion 213 of the mounting portion 21 is inserted into the engagement hole 122 of the assembly portion 12 and engages with the engagement hole 122. The cover 22 of the positioning assembly 20 has an internal thread and can be screwed onto the threaded portion 212 of the mounting portion 21.

[0017] 1, 2 and 7, the six alignment units 30 are detachably assembled to the six mounting portions 12, respectively, and the six alignment units 30 are inserted into the six positioning assemblies 20, respectively. Each alignment unit 30 has an insert portion 31 and an alignment plate 32. The insert portion 31 is a rod having two opposite ends and an internal thread.

[0018] The alignment plate 32 is disposed at one of the two ends of the insert 31 and has a thickness. The thickness of the alignment plate 32 corresponds to the width of each slot 61 of the collet 60. The alignment plate 32 is configured to fit into one of the slots 61 of the collet 60.

[0019] Each alignment unit 30 is screwed into the alignment hole 123 of the corresponding one of the assembly parts 12 via its insertion part 31, and the alignment plate 32 of the alignment unit 30 is inserted through the through hole 215 of the mounting part 21 of the corresponding one of the positioning assemblies 20 and into the collet receiving hole 214 of the mounting part 21. One of the slots 61 of the collet 60 is fitted into the alignment plate 32 of the alignment unit 30, aligning the slot 61 of the collet 60 and the alignment plate 32.

[0020] 1, 2 and 7, an additional nut 33 is actually screwed into the insert of each alignment unit 30 to tightly abut one of the blocks 11 of the main body 10. Therefore, the alignment unit 30 cannot be rotated accidentally. Therefore, the orientation of the alignment plate 32 of the alignment unit 30 is restricted.

[0021] 1, 2 and 7, when the collet 60 is fixed by the fixture of the present invention and a coolant channel is formed therein, the fixture of the present invention is first assembled to the work table 70. In practice, the present invention may further include a suitable base for connecting the main body 10 and the work table 70.

[0022] Next, the mounting portion 21 of one positioning assembly 20 is assembled to the corresponding one of the assembly portions 12. The engagement portion 213 of the mounting portion 21 is inserted into the engagement hole 122 of the assembly portion 12 and engages with the engagement hole 122.

[0023] The flange 211 of the mounting part 21 engages with the positioning pit 121 of the assembly part 12, and the two abutment surfaces 216 of the flange 211 abut against the two abutment surfaces 125 of the positioning pit 121, respectively. Then, a plurality of bolts are attached through the flange 211 and screwed into the bottom surface 124 of the positioning pit 121, thereby fixing the mounting part 21 to the assembly part 12.

[0024] Next, the insertion portion 31 of the corresponding alignment unit 30 is screwed into the alignment hole 123 of the assembly portion 12, and the alignment plate 32 is passed through the engagement hole 122 of the assembly portion 12, passed through the through hole 215 of the mounting portion 21, and inserted into the collet receiving hole 214 of the mounting portion 21.

[0025] One collet 60 is inserted into the collet receiving hole 214, and the alignment plate 32 is sleeved into one of the slots 61 of the collet 60. The orientation of the collet 60 is restricted, and alignment of the collet 60 is achieved accordingly. Finally, the cover 22 of the positioning assembly 20 is screwed onto the threaded portion 212 to press the collet 60 and secure the collet 60 to the fixture of the present invention.

[0026] Following the above process, the six collets 60 are secured in the fixture of the present invention as shown in Figures 8 and 9, and then a spindle 80 can be used to machine the six collets 60 to form the coolant channels in each collet 60. Once the coolant channels in each of the six collets 60 are formed, another six collets are assembled in the fixture of the present invention to form the coolant channels in the collets.

[0027] The inconvenience and tedious operation of repeatedly assembling and disassembling the collet in a short time is avoided.Compared with the conventional fixture, the fixture of the present invention does not require assembling the collet together with the cutter holder to the fixture in order to form a coolant channel in the collet.Accordingly, the physical strength can be saved. In addition, six collets can be machined simultaneously through one assembly of collets, improving the efficiency of forming coolant channels within the collets.

[0028] In the embodiment of the present invention, the main body 10 has three blocks 11, and each block 11 has two mounting portions 12. In practice, the number of blocks 11 and the mounting portions 12 in each block 11 is not limited as long as the main body 10 has at least two mounting portions 12 for mounting at least two positioning assemblies 20 and at least two alignment units 30 for fixing the collets 60.

[0029] In an embodiment of the present invention, the alignment plate 32 of each alignment unit 30 inserted into the collet receiving hole 214 of the mounting portion 21 corresponding to one of the positioning assemblies 20 is configured to fit (sleeved) into the slot of one of the collets. The collet is restricted from rotation within the collet receiving hole 214 in the mounting portion 21 of the positioning assembly 20. Thus, the positions of the coolant channels and the slots in the collet correspond to each other.

[0030] Furthermore, in the mounting portion 21 of each positioning assembly 20, the two abutment surfaces 216 of the flange 211 of the mounting portion 21 respectively abut against the two abutment surfaces 125 of the positioning pit 121 of the corresponding one of the assembly portions 12. This promotes the accuracy of the size and position of the coolant channel of the collet.

[0031] Although many of the features and advantages of the present invention have been set forth in the foregoing description, together with details of the structure and features of the invention, the present disclosure is merely illustrative, and changes may be made in details, particularly in matters of shape, size, and arrangement of parts within the principles of the invention, within the full scope indicated by the broad general meaning of the terms in which the appended claims are expressed.

Claims

1. A fixture having a body, at least two positioning assemblies, and at least two alignment units, The body has at least two mounting portions, each mounting portion having: An engagement hole; an alignment hole that is laterally connected to the engagement hole; the at least two positioning assemblies are detachably assembled to the at least two mounting portions, respectively, and each positioning assembly includes a mounting portion and a cover; The mounting portion is a threaded portion having an external thread; an engaging portion coaxial with the threaded portion and extending opposite the threaded portion; a collet receiving bore disposed within the mounting portion and extending through the threaded portion and the engagement portion; a through hole formed radially through the engagement portion and connected to the collet receiving hole; The cover is threaded onto the threaded portion, The engaging portion of the mounting portion of each positioning assembly engages with a corresponding one of the engaging holes of the at least two mounting portions; The at least two alignment units are detachably assembled to at least two mounting portions, respectively, and inserted into at least two positioning assemblies, respectively, and each alignment unit comprises: an insertion portion that is a rod; an alignment plate disposed at one of the two ends of the insertion portion, inserted into an engagement hole of a corresponding one of the at least two assembly portions, passing through a through hole of a mounting portion of a corresponding one of the at least two positioning assemblies, and entering a collet receiving hole of the mounting portion of the corresponding positioning assembly; The fixture, wherein the alignment plate is configured to fit into a slot in a collet.

2. Each assembly part has a positioning pit, The engagement holes of each assembly part are formed on the bottom surface of the positioning pit, The mounting portion of each positioning assembly has a flange that engages with a corresponding one of the positioning pits of the at least two mounting portions; 2. The fixture of claim 1, wherein the threaded portion and the engaging portion of the mounting portion of each positioning assembly respectively extend from two opposing surfaces of the mounting portion flange.

3. The positioning pit of each assembly part has two abutment surfaces facing each other on both sides of the positioning pit; the flange of the mounting portion of each positioning assembly has two opposing abutment surfaces on either side of the flange; 3. The fixture according to claim 2, wherein two abutment surfaces of the flange of the mounting portion of each positioning assembly abut against two abutment surfaces of a corresponding one of the positioning pits of the at least two mounting portions, respectively.

4. The alignment holes of each assembly portion have internal threads; The insert of each alignment unit has an external thread; The fixture of claim 3, wherein the insert of each alignment unit is threaded into a corresponding alignment hole of the at least two mounting parts.

5. The fixture of claim 4 , wherein the insert of each alignment unit abuts the body by being screwed with a nut.

6. the body has three blocks arranged at equal angles, each block having a slope extending diagonally downward from the center of the body to an edge of the body; the at least two mounting portions are six mounting portions, the six mounting portions are evenly distributed among three blocks, and the two mounting portions in each block are spaced apart and disposed along the slope of the block; the at least two positioning assemblies are six positioning assemblies; 6. The fixture of claim 1, wherein the at least two alignment units are six alignment units.

7. 7. The fixture according to claim 6, wherein the bottom surface of the positioning pit of each assembly part in each block is parallel to the inclined surface of the block, and the engagement hole of the assembly part is defined perpendicular to the bottom surface of the positioning pit.

8. The alignment holes of each assembly portion have internal threads; The insert of each alignment unit has an external thread; The fixture of claim 1 , wherein the insert of each alignment unit is threaded into a corresponding one of the alignment holes of the at least two mounting portions.

9. The fixture of claim 8 , wherein the insert of the alignment unit is screwed onto the body with a nut.

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