SU1266669A2 - Holder for thread-cutting tool - Google Patents

Abstract

1. HOLDER FOR THREAD-BORN TOOL BY AUTH. St. No. 1217586, characterized in that, s. the purpose of increasing thread quality and convenience is to work; the holder is provided with an additional stop in the form of a ring with a handle mounted on the mandrel with the possibility of rotation, axial movement and interaction with the optical stop and the body .7 som, with the main stop made in the form of a ring and mounted on the frames ke, and the contact surfaces of the stops are modified. 2. A holder according to claim 1, wherein the interface of the lugs is wedge-shaped. 3. Holder pop 1, characterized in that the contact surfaces of the lugs are screw-shaped. 4. The holder according to claim 1, tl l and the fact that in order to increase safety of operation and to extend service life, the holder is equipped with a sleeve with an annular collar, l mounted on the case so that it can be rotated, axially moved, fixed to him and interact with. main focus. N5 o: O) Aud Od with ISJ

Description

The invention relates to mechanical engineering, in particular to tools of metalworking machines for fastening a tool, and can be applied to threading in holes and on rods under the condition of rotation of the workpiece. The purpose of the invention is to improve the quality of the cut thread, convenience and safety in operation and increase durability.

FIG. 1 shows schematically a device without a sleeve with inclined end surfaces of the stops, a variant; in fig. 2 - the same, with screw

M surface stops, option; in fig. 3 is a section A-A in FIG. 2; in fig. 4 - the initial moment of the holder; in fig. 5 is a section B-B in FIG. four; in fig. 6 - the position of the evil Cents holder in the final position.

The holder consists of a mandrel 1 with a tapered shank 2, a housing 3 with a longitudinal groove 4, a retainer 5 with ledges having an inclined surface 6 and 7, springs 8 and a plug 9, annular stops 10 and 11 with a fixing bolt 12. On the stop 11 a handle is fixed 13. The contact surfaces on the stops are made inclined 14 (at an angle to the axis of rotation) or screw 15. On the retainer between ledges 6 and 7 there is a protrusion 16. On the ring stop fixed by means of a bolt 12, a stop 17 is fixed to rotate the stop 11 relative to the stop 10 in top position. On the stop with inclined contact surfaces (Fig. 1), the rotation limiter can be installed in the lower position. The free position of the stop with the handle down (as a tandem) is also possible. On helical surfaces, a lower rotation limit is provided by surfaces 18 and 19, formed by cutting the spiral ring along the generatrix into two parts. The fixed stop 10 can move along the axis of the mandrel (Fig. 1), and can be rigidly fixed on it or made with it in one piece (Fig. 2.4). A sleeve 20 with a longitudinal groove 21 and a fixing bolt 22 provided with an annular drill 23 can be put on the housing.

At the free end of the casing 3 thread-cutting tool

24 for machining the part 25. On the surface of the housing, along the groove 21 of the sleeve 20, a metric scale is applied. Adjacent to the tool 24 in the body of the housing and, accordingly, windows 26 and 27 are cut out on the sleeve for exit of the chips. In order to better read the pjal divisions, a chamfer is made on the bushing. An annular protrusion 29 is made on the inner surface of the bushing from the side of the collar.

The holder is used in two versions; with sleeve 20 and without it. In the second case (Fig. 1), the holder is inserted by the shank 2 into the tailstock quill of the machine and adjusted to the length of the cut thread H.- Yal this is displaced by the body 3 along the mandrel

I until the distance of the end of the body to the border of the protrusion 16 and the inclined surface 6 of the step on the spring-loaded fixture 5 becomes equal (determined by the metric scale applied to the surface of the body) to the required cutting length. Then, both annular stops 10 and 11 are displaced to the end of the body and the stop 10 is fixed on the mandrel by bolt 12. Then, the part 25 is inserted into the machine chuck and the quill of the headstock together with the holder is pushed up to a distance of 2-3 mm between the thread-cutting tool 24 and butt. details. After this, the mechanism for moving the quill until the end of processing a batch of parts is not used. Turn on the rotation of the part and, watching the cutting area, turn the handle 13 for the stop

II round mandrel at an angle | 90-120 At the same time, due to the cereal width of the inclined surfaces 14 that have a wedging effect, the rotating support 11 begins to move along the axis relative to the fixed support 10 and to displace the body towards the part. The angle CX of the inclination of the surfaces 14 is chosen such that when turning the knob by f 90-120 ° the emphasis is displaced by the amount of the gap between the tool and the part plus the value of the thread pitch. When this occurs, the tool plunges into the part by one turn, and further cutting occurs by self-rolling. Return to the original position of the handle and stop

11 occurs by the movement of a hand turning or under the action of its own weight Q on the shoulder h (Fig. 5). In order for the returning torque to be sufficient, the limiter 17 is mounted on the stop. At the end of the cutting, the groove 4 of the housing 3 comes out of contact with the surface of the protrusion 16 on the retainer and, pressing on the inclined surface 6, lowers the retainer into the mandrel socket. The cutting stops and the body, along with the tool and the part, begins to rotate on the mandrel. During reverse rotation of the parts, the spring 8 pushes the retainer into the groove 4, and the housing interacts with the retainer, stopping the rotation relative to the mandrel and, screwing in on the parts, begins its axial movement to the initial position. During this movement, on the last turn, the end of the body nods the stop 11 with the handle to the stop 10 by the amount of tie-in plus fractions of a millimeter to which the tool with the body pushes the part during rotation. This is possible because the stop 11, having turned around the axis, does not receive axial movement, and a gap is formed between the surfaces 14, equal to the course when turning upwards. In order to finally compensate for the remaining gap of 2-3 mm, when removing the part from the Latron along the axis to the tailstock, the body (rear side) is simultaneously shifted and the body until the surfaces 14 are completely in contact. Later everything is repeated in the same way. When cutting, the chips exit through the window 26. To cut the left-hand thread, remove the body from the mandrel. In this case, the shoulders d do not allow the retainer to pop out of the socket (Fig. 3) by turning the plug 9, which adjusts the compression of the spring 8, remove the retainer and, turning it 180 ° around its axis, reassemble the holder. Now, the inclined surfaces 6 and 7 of the shoulders (Fig. T) are swapped. When using this option, it is possible to drop the housing with the mandrels. - A safer and more reliable design of the holder with sleeve 20 (FIG. 2,4,6). Assembly is carried out as follows. The sleeve is put on the housing and the bolt 22 is fitted through the groove 21 with the housing. Then assemble them push on the mandrel, pre-drowning the latch in the socket mandrel, flush with the surface of the mandrel. Similarly, disassembly. For this, a hole for passage of a probe (screwdriver) can be made in the sleeve in the area from the annular protrusion 29 or a rectangular cutout is made at the end face in the wall of the annular collar 23 for the passage of the protruding part of the retainer. In the latter case, it is necessary to unscrew the bolt 22 and turn the sleeve to the required angle to align the said notch with the groove of the housing. You can also slide the retainer into the slot through the groove 21. To adjust the holder, the sleeve is moved along the body. In this case, a scale with numbers comes out from under the chamfer 28. The more the sleeve is moved from the case by the value of I, the shorter the cutting length and the number of digits. For example, the maximum cutting length is indicated in FIG. 2 L 74 mm, and reduced - in FIG. 4 "ar liaicc 56 mm. These readings are calculated on a scale at the end of the sleeve. The cutting process is similar to that indicated for FIG. 1. The feed for the incision is made by a screw surface 15 of the anvil 11 relative to the fixed anvil 10, which is integral with the mandrel adjacent the shank. The movement of the stop 11 with the handle 13 down is limited due to the interaction of the supporting surfaces 18 and 19. The chips exit through the windows 26 and 27. The maximum cutting length is set when the sleeve is pushed onto the body until the annular protrusion 29 stops at the end of the body (Fig. 2). When the release of the retainer from the groove 4 of the housing, the protrusion 16 and the ledge of the surface 7 are under this protrusion and do not touch the collar 23, since the size is longer from on to. 1 mm. In operation, the cutting forces are perceived by the walls of the groove 4 and transferred (in the case of elastic deformations) to the sleeve 20. When transferring the ring collar holder, clinging to the protrusion 16, prevents the housing from falling (Fig. 6). c, i6 If 1 ± U: A ... / ft Shy 25 J LMQKC

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Claims (4)

1. HOLDER OF THE DAY. THREADING TOOLS by ed. St. No. 1217586, characterized in that, in order to improve the quality of the thread and ease of operation, the holder is equipped with an additional stop in the form of a ring with a handle mounted on a mandrel with the possibility of rotation, axial movement and interaction with the main focus and the body Fig. / Catfish, moreover, the main emphasis is made in the form of a ring and mounted on a mandrel, and the interaction surfaces of the emphasis are modified. 2. Holder pop. 1, characterized in that the interaction surfaces of the stops are wedge-shaped. 3. Holder pop. ^ characterized in that the interaction surfaces of the stops are made screw. 4. The holder according to Claim. Characterized in that in order to increase the safety of work and increase the service life, the holder is equipped with a sleeve with an annular collar mounted on the housing with the possibility of rotation of fixation by the main axial movement, with it and interaction with emphasis. SU ... 1266669