• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:

    公开号:SE0950111A1
    申请号:SE0950111
    申请日:2009-03-04
    公开日:2010-09-05
    发明作者:Jorma Koskinen
    申请人:Seco Tools Ab；
    IPC主号:
    专利说明:

    at least one of the tool and the workpiece relative to each other in a direction substantially perpendicular to a direction of the geometric axis of the workpiece while at the same time at least one of the tool and the workpiece is moved relative to each other in a substantially axial direction of the workpiece so that said at least a cutting edge forms a plurality of recesses in the workpiece, said plurality of recesses defining a helical thread.
    In accordance with another aspect of the present invention, a thread milling insert comprises a plurality of teeth longitudinally spaced along an edge of the insert, each tooth having a cutting edge at a tip of the tooth, a longitudinal distance between any two cutting edges being at least twice as large. than a height of any tooth.
    In accordance with yet another aspect of the present invention, a thread milling tool comprises a thread milling insert comprising a plurality of teeth longitudinally spaced along an edge of an elongate body of the insert, each tooth having a cutting edge at a tip of the tooth, a longitudinal distance between any two cutting edges are at least twice the height of a tooth, and a tool holder comprising a cutting receiving recess for receiving the elongate body of the insert so that said plurality of teeth extend radially relative to a longitudinal axis of the tool.
    In accordance with yet another aspect of the present invention, there is provided a threaded article comprising at least one inlet and a helical thread comprising at least one turn, the thread comprising a plurality of regularly spaced recesses extending substantially perpendicular to a length of the thread.
    BRIEF DESCRIPTION OF THE DRAWINGS The features and advantages of the present invention will be readily understood by reading the following detailed description taken in conjunction with the drawings in which like numerals indicate like elements and in which: FIG. 1A-1C are partial cross-sectional side views of a workpiece on which a thread milling tool according to an aspect of the present invention is shown at different axial and radial positions relative to the workpiece; FIG. 1D is a schematic top view of a workpiece showing a thread milling tool at various positions around an inner circumference of the workpiece, and FIG. 1E is a schematic top view of a workpiece showing a thread milling tool at different radial positions relative to a longitudinal axis of the workpiece; FIG. 1F is a partial cross-sectional side view of a workpiece after a first pass of a thread milling tool according to an aspect of the present invention, and FIG. 1G is a partial cross-sectional side view of a workpiece after a plurality of passes of a thread milling tool according to one aspect of the present invention; FIG. 2A is a schematic view of an arrangement of cutting edges for forming a multi-inlet thread according to one aspect of the present invention, and FIG. 2B is a schematic side view of an arrangement of cutting edges for forming a thread with an entrance according to an aspect of the present invention; FIG. 3A is a perspective view of a milling insert according to an aspect of the present invention, FIG. 3B and 3C are side and end views, respectively, of the insert of FIG. 3A, and FIG. 3D is a cross-sectional end view taken at the 3D-3D section of FIG. 3B; and FIG. 4A is a side view of a tool holder for a thread milling tool, and FIG. 4B and 4C are exploded side and bottom views of a thread milling tool shown with inserts removed from insert receiving recesses on the tool holder.
    DETAILED DESCRIPTION A method of designing a threaded workpiece 21 is seen with reference to FIG. 1A-1G. According to the method, a tool 23 is rotated about a geometric axis AT of the tool.
    The tool 23 has a tool holder 25 and at least one cutting edge 27 arranged radially relative to the geometric axis AT of the tool. As shown, for example, in FIG. 1A-1C, at a plurality of circumferential positions (shown in FIG. 1D as positions aj), about a geometric axis AW of the workpiece 21, at least one of the tool 23 and the workpiece 21 are moved relative to each other in a direction substantially perpendicular to a direction of the geometric axis of the workpiece, i.e. radially outwards from the position shown in FIG. 1A to the position shown in FIG. 1B, and radially inward from the position shown in FIG. 1B to the position shown in FIG. 1C, and as shown by the top view shown in FIG. 1E, where a radially inner position of the tool 23 is shown transparently, and a radially outer position of the tool is shown in solid lines.
    Simultaneously with the movement radially inwards and outwards, at least one of the tool 23 and the workpiece 21 is moved relative to each other in a substantially axial direction of the workpiece, i.e. substantially continuously axially downwards as shown in FIG. 1A-1C. In this way, the at least one cutting edge 27 forms a plurality of recesses in the workpiece.
    A single recess 29 is shown in FIG. 1F, i.e. formed by a single passage of the tool 23 relative to the workpiece 21. The lack of perfect symmetry of the recess 29 about a longitudinal axis of the workpiece can be explained by the fact that the tool moves along the geometric axis of the workpiece when the recess is formed. This can be beneficial in creating a thread shape. Movement of the workpiece and / or tool relative to each other in an axial direction of the workpiece is described as "substantially" in an axial direction because the workpiece 21 will often be rotated and / or the tool 23 will be controlled to move with a circumferential movement component so that the tool follows an "S" -shaped recess 29 as shown in Fig. 1F to compensate for changes in the point of attack of the rotating tool when the tool and / or the workpiece are moved radially relative to each other.As shown, for example, in Fig. 1E the point of attack PA1 of the tool 23 to typically lie on a line extending through the center axes of the tool and the workpiece 21 when the tool first comes into contact with the workpiece, but will move to the points PA2L or PA2R to the left or right (depending on the direction of rotation at the tool) if the line through the center axes of the tool and the workpiece when the tool cuts into the workpiece. A plurality of recesses formed by a plurality of passages of the tool 23 relative to the workpiece 21 together define a helical thread 31 as shown in FIG. 1G. The resulting threaded article 21 includes at least one inlet 33 and a helical thread 31 that includes at least one turn, the thread comprising a plurality of regularly spaced recesses 29 extending substantially perpendicular to a length of the thread.
    Usually relative movement of the workpiece 21 and the tool 23 is effected by moving the tool relative to the workpiece, although it is also possible that the workpiece may be moved relative to the tool and / or that both the workpiece and the tool will be moved relative to each other. For purposes of discussion, it will be assumed that the tool 23 moves relative to the workpiece 21, it is understood that aspects of the invention may include the workpiece moving relative to the tool, or both the workpiece and the tool moving relative to each other.
    In the method illustrated in FIG. 1A-1G, the helical thread 31 is an internal thread. However, the helical thread may instead be an external thread as shown in FIG. 2A-2B.
    As shown in FIG. 1A-1C, the tool 23 usually has a plurality of cutting edges 27 which are arranged radially relative to the geometric axis AT of the tool 23.
    Movement of the tool 23 and the workpiece 21 relative to each other in the direction substantially perpendicular to the direction of the geometric axis AW of the workpiece 21 while the tool rotates about the geometric axis AT of the tool causes at least two of said plurality of cutting edges 27 to form at least two recesses. 29 in the workpiece, of course assuming that neither of the cutting edges is in a previously designed recess.
    The threaded workpiece 21 may be formed with one or more inputs, i.e. the thread may be a multiple thread as shown in FIG. 2A or a single thread as shown in FIG. 2B. FIG. 2A shows a workpiece 121 formed with two inputs 33a and 33b corresponding to two threads 31a and 31b. When such threads 31a and 31b are formed by a tool with multiple cutting edges 27, each thread of the threaded workpiece 21 has with N inputs a pitch P, and tips 35 of said plurality of cutting edges 27 of the tool may be separated according to the relationship P / N. For the threads 31a and 31b each having the pitch P with two inputs 33a and 33b shown in FIG. 2A, the pitch between the tips of two cutting edges may thus be P / 2. For a thread with an input, where the thread has a pitch P, the tips 35 of a plurality of cutting edges 27 may be separated according to the relationship NP, where N is an integer other than zero. Thus, multiple cutting edges 27 may be separated by the division 1P, as shown by solid lines, or other divisions, such as 2P or 3P, etc., as shown by transparent lines.
    By making a plurality of passages of the tool 23 in relation to the workpiece 21 at said plurality of circumferential positions around the workpiece, the thread 31 becomes more and more completely formed. For many applications the passages can be made at 3 ° to 5 ° intervals around the geometric axis AW of the workpiece 21. It is currently considered that for many applications the thread 31 will be desirable to perform said plurality of passages at a plurality of circumferential positions which are separated by intervals between 20-30 μm around the circumference of the workpiece 21 or any angular range.
    Unlike in threads formed by typical thread cutters, the helical thread 31 formed according to an aspect of the method of the present invention may have a basic shape different from a profile of said at least one cutting edge 27. As shown, for example, in FIG. 1A-1C, the thread 31 has a generally elongated and curved shape, for example a rope thread, while the notches 27 are more triangular and have a shorter shape. By giving appropriate instructions to a conventional milling machine, such as via a computer program, threads 31 of a variety of shapes and sizes can be formed into workpieces with a single tool 23.
    The cutting edges 27 are typically arranged on a thread milling insert 37 as shown in FIG. 3A-3D. The insert 37 comprises a plurality of teeth 39 which are longitudinally spaced along an edge of the insert. Each tooth 39 has a cutting edge 27 at a tip 35 of the tooth. The cutting edge 27 may comprise an entire or substantially an entire periphery of the tooth 39, or only a portion of the tooth near the tip 35. As shown in FIG. 1A-1C, the cutting edge 27, i.e. the portion of the tooth 39 which actually cuts the workpiece 21, may be a relatively small portion of the tip 35 of the tooth with a substantially non-cutting portion 41 between the cutting edge 27 and the main body 43 of the insert. A longitudinal distance LDCE between any two cutting edges is at least twice greater than a longitudinal length LLCE of any cutting edge and / or, as shown in FIG. 3B, at least twice larger, and preferably at least three times larger, than a height H of any tooth 39 measured from the tip 35 of the tooth to a base 42 of the tooth, usually where the tooth intersects a top portion 44 of a main body 43 of the insert. By selecting a suitable longitudinal distance LDCE, a tool and inserts according to an aspect of the invention can be used in a manner that facilitates the design of a variety of thread shapes that may be different from the shape of the teeth 39.
    As shown in FIG. 3C and 3D, each tooth 39 may be provided with first and second cutting edges 27 on opposite first and second sides 45 and 47 of the insert 37.
    The insert 37 may be rotationally symmetrical about a center of rotation CL of the insert shown in FIG. 3B so that when one side of the insert becomes worn, it can be rotated and the other side can be used.
    When the insert 37 on each tooth 39 is provided with first and second cutting edges 27 on the first and second sides 45 and 47 of the insert, the tooth has first and second chip noses 49 extending from the first and second cutting edges 27 away from the tip 35 of the tooth, respectively. The first and second chip surfaces 49 define an acute angle ANG with each other so that a narrowest portion N of the tooth 39 is spaced from the tip 35 of the tooth.
    First and second cutting surfaces 51 are arranged near ends 53 of the first and second chip surfaces 49, respectively. The first and second cutting surfaces 51 extend from the location near the ends 53 of the first and second chip surfaces 49 in a direction away from a longitudinal center line or centrally. plane CP (FIG. 3C) of the insert 37. The first and second cutting surfaces 51 may be curved to facilitate chip formation. In the insert 37 shown in FIG. 3A-3D, said plurality of teeth 39 extend from an elongate cutting body 43, and the first and second cutting surfaces 51 are at least partially formed in the body.
    As shown in FIG. 4B-4C, a thread milling tool 23 according to an aspect of the present invention comprises at least one and usually a plurality of thread milling cutters 37 (FIGS. 4B-4C) and a tool holder 25 comprising one or more insert receiving recesses 57 for receiving the elongate body of the insert / the inserts so that said plurality of teeth 39 extend radially relative to the longitudinal axis AT of the tool.
    The tool holder 25 typically comprises a plurality of screen receiving recesses 57 which are arranged at different longitudinal positions along the tool. The recesses 57 may be longitudinally spaced so that a longitudinal distance LDCE 'between a first cutting edge 27 on a first insert 37 in a first insert receiving recess 57 at a first longitudinal position along the tool and a second cutting edge 127 on a second insert 137 in a second insert receiving recess 157 at a second longitudinal position along the tool is equal to a distance LDCE between the first cutting edge of the first insert and another cutting edge 27 of the first insert.
    The tool holder 25 typically comprises a plurality of screen receiving recesses 57 which are arranged at different positions around a circumference of the tool 23.
    The inserts 37 can be secured in the insert receiving recesses 57 in any suitable manner. Typically, the tool holder 25 is provided with a plurality of internally threaded openings 59 extending from a surface of the tool holder to the cutting receiving recesses 57 and locking screws (not shown) are provided in the openings to secure the inserts relative to the cutting receiving recesses.
    The inserts 37 may be provided with recesses 61 for receiving ends of the locking screws in order to facilitate securing of the inserts in relation to the shield-receiving recesses via the locking screws.
    In the present application, the use of terms such as "inclusive" is non-limiting and is intended to have the same meaning as terms such as "inclusive" and not to exclude the existence of other construction, material or other measures. Although the use of terms such as "may" is likewise intended to be non-limiting and to reflect that structure, materials or measures are not necessary, failure to use such terms is not intended to reflect the design, materials or measures required. To the extent that construction, materials or measures are currently deemed necessary, they are identified as such. Although this invention has been illustrated and described in accordance with a preferred embodiment, it will be appreciated that variations and modifications may be made therein without departing from the invention as set forth in the claims. 11
    权利要求:
    Claims (17)
    [1]
    A method of forming a threaded workpiece (21), comprising: arranging a tool (23) with a thread milling insert (37), comprising a plurality of teeth (39) longitudinally spaced along an edge of the insert (37), each tooth (39) has a cutting edge (27) at a tip (35) of the tooth (39), so that a longitudinal distance (LDCE) between any two cutting edges (27) is at least twice greater than a height (H) of any tooth (39), rotating the tool (23) about a geometric axis (AT) of the tool (23), the tool (23) having a tool holder (25) and at least one cutting edge (27) arranged radially relative to the geometric the shaft (AT) of the tool (23); at a plurality of circumferential positions about a geometric axis of the workpiece (21), move at least one of the tool (23) and the workpiece (21) relative to each other in a direction substantially perpendicular to a direction of the geometric axis (AW) for the workpiece (21) while at the same time at least one of the tool (23) and the workpiece (21) is moved relative to each other in a substantially axial direction of the workpiece (21) so that said at least one cutting edge (27) forms a plurality of recesses in the workpiece ( 21), said plurality of recesses defining a helical thread (31) having at least one inlet (33) and comprising at least one turn, the thread comprising a plurality of regularly spaced recesses (29) extending substantially perpendicular to a length of the thread. 12
    [2]
    A method of designing a threaded workpiece (21) according to claim 1, in which the tool (23) has a plurality of cutting edges (27) arranged radially relative to the geometric axis of the tool (23), and in which movement of the tool (23) and the workpiece (21) relative to each other in the direction substantially perpendicular to the direction of the geometric axis (AW) of the workpiece (21) cause at least two of said plurality of cutting edges (27) simultaneously to form at least two recesses in the workpiece (21).
    [3]
    A method of designing a threaded workpiece (21) according to claim 2, comprising designing the threaded workpiece (21) having N inputs, where N> 1.
    [4]
    A method of designing a threaded workpiece (21) according to claim 3, wherein each thread (31a, 31b) of the threaded workpiece (21) having N inputs has a pitch P, and tips of said plurality of cutting edges (27) of the tool (23) are separated according to the P / N relationship.
    [5]
    A method of designing a threaded workpiece (21) according to claim 2, in which the thread (31) has a pitch P, and tips of said plurality of cutting edges (27) are separated according to the connection NP, where N is an integer other than zero .
    [6]
    A method of designing a threaded workpiece (21) according to any one of claims 1-5, in which the helical thread (31, 31a, 31b) has a basic shape different from a profile of said at least one cutting edge. 13
    [7]
    A method of designing a threaded workpiece (21) according to any one of claims 1 to 6, in which said at least one of the tool (23) and the workpiece (21) are moved relative to each other in a substantially axial direction of the workpiece (21) which includes a circumferential movement component so that the workpiece follows an S-shaped recess (29).
    [8]
    Computer readable medium storing a computer program implementing the method according to any one of claims 1-7.
    [9]
    A thread milling insert (37), comprising: a plurality of teeth (39) longitudinally spaced along an edge of the insert (37), each tooth (39) having a cutting edge (27) at a tip (35) of the tooth (39). ), characterized in that a longitudinal distance (LDCE) between any two cutting edges (27) is at least twice greater than a height (H) of any tooth (39).
    [10]
    A thread milling insert (37) according to claim 9, wherein each tooth (39) has first and second cutting edges (27) on opposite first and second sides of the tooth (39).
    [11]
    The thread milling insert (37) of claim 10, wherein each tooth (39) has first and second chip surfaces (49) extending from the first and second notch edges (27) away from the tip (35) of the tooth (39), respectively. the first and second chip surfaces (49) define an acute angle (ANG) with each other so that a narrowest portion (N) of the tooth (39) is spaced from the tip (35) of the tooth (39). 14
    [12]
    Thread milling insert (37) according to claim 11, in which, for each tooth (39), first and second cutting surfaces (51) are arranged near ends (53) of the first and second chip surfaces (49), respectively, the first and second the cutting surfaces (51) extend from near ends (53) of the first and second chip surfaces (49) in a direction away from a longitudinal central plane (CP) of the insert (37).
    [13]
    Thread milling insert (37) according to claim 12, in which the first and second cutting surfaces (51) are curved.
    [14]
    The thread milling insert (37) of claim 13, wherein said plurality of teeth (39) extend from an elongate cutting body (43), and the first and second cutting surfaces (51) are at least partially formed in the body (43).
    [15]
    Thread milling insert (37) according to any one of claims 9-14, in which the insert (37) is rotationally symmetrical about a center of rotation (CL) of the insert (37).
    [16]
    A thread milling tool (23), comprising: a thread milling insert (37, 137) comprising a plurality of teeth (39) longitudinally spaced along an edge of an elongate body (43) of the insert (37, 137), each tooth (39 ) has a cutting edge (27) at a tip of the tooth (39); and a tool holder (55) comprising a blade receiving recess (57, 157) for receiving the elongate body of the blade (37, 137) so that said plurality of teeth (39) extend radially relative to a longitudinal axis of the tool (23). ), characterized in that a longitudinal distance between any two cutting edges (27, 127) is at least twice greater than a height (H) of any tooth.
    [17]
    Threaded article (21), comprising at least one inlet (33) and a helical thread (31) comprising at least one turn, the thread comprising a plurality of regularly spaced recesses (29) extending substantially perpendicular to a length of the thread. 16
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    同族专利:
    公开号 | 公开日
    WO2010101512A3|2010-10-28|
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    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    DE1280638B|1966-04-30|1968-10-17|Burgsmueller Karl|Device for whirling internal threads|
    DE3402743C2|1984-01-27|1986-09-25|Index-Werke Kg Hahn & Tessky, 7300 Esslingen|Method and device for thread production|
    DE3922707A1|1988-07-28|1990-02-01|Reime Ernst Gmbh Co Kg|Method of producing tapped holes and tool for carrying out this method|
    JP2541667B2|1989-09-28|1996-10-09|オークマ株式会社|Thread cutting machine|
    US6565297B2|1998-04-17|2003-05-20|M. Norbert Schmitt|Method of milling large thread lengths|
    SE517447C2|1999-06-29|2002-06-04|Seco Tools Ab|Thread mill with cutter|EP2954968B1|2014-06-13|2021-01-20|Walter Ag|Thread milling cutter|
    WO2016182983A1|2015-05-08|2016-11-17|Milwaukee Electric Tool Corporation|Milling cutter|
    DE102016122154A1|2016-11-17|2018-05-17|Franz Folz|Plain bearing bush and method and tool for their production|
    US20180169780A1|2016-12-19|2018-06-21|Anvil International, Llc|Cleanline threader|
    DE102017105018A1|2017-03-09|2018-09-13|Winfried K. W. Holscher|Thread milling cutter for producing a thread|
    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    SE0950111A|SE534617C2|2009-03-04|2009-03-04|Method for thread milling, computer-readable medium and threaded article cutting|SE0950111A| SE534617C2|2009-03-04|2009-03-04|Method for thread milling, computer-readable medium and threaded article cutting|
    PCT/SE2010/050223| WO2010101512A2|2009-03-04|2010-02-26|Method of thread milling, thread, and insert and tool for thread milling|
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