A telescopic toothed die

Abstract

The application discloses a telescopic thread rolling die, which comprises a movable seat and a fixed seat which are movably connected, a thread rolling mechanism arranged on the fixed seat, an outer insert arranged on the thread rolling mechanism and an inner insert arranged in the outer insert, and a pushing mechanism arranged on the movable seat, wherein the movable seat drives the pushing mechanism to push a workpiece to be discharged during the thread rolling mechanism retracts. The telescopic thread rolling die comprises a movable seat and a fixed seat which are movably connected, a thread rolling mechanism arranged on the fixed seat, an outer insert arranged on the thread rolling mechanism and an inner insert arranged in the outer insert, and a pushing mechanism arranged on the movable seat, wherein the outer insert and the inner insert slide relative to each other to complete the processing of internal threads of the workpiece, and at this time, the pushing mechanism arranged on the movable seat drives the pushing mechanism to push the workpiece to be discharged.

Description

Technical Field

[0001] This invention relates to the field of mold technology, and specifically to a telescopic threaded mold. Background Technology

[0002] A threaded die, also known as a threaded mold, involves shaping and molding molten plastic using a cavity, while also rotating a core to create threads, resulting in a threaded structure on the final molded part. Currently, threaded dies on the market require a power mechanism to drive the core to rotate during demolding, such as a motor; or a hydraulic cylinder to drive a rack to move in a specific direction, which in turn drives the core to rotate.

[0003] For example, the patent titled "A High-Precision Coilover Mold" (CN211542163U, authorized announcement date September 22, 2020) discloses a high-precision coilover mold, including a male mold and a female mold. The female mold has a coilover mechanism, which includes: a drive cylinder; a rack connected to the output shaft of the drive cylinder to move under its drive; a gear shaft with teeth and a first gear, the teeth meshing with the rack to rotate the gear shaft and thus the first gear; a coilover shaft with a second gear meshing with the first gear to rotate the coilover shaft; a forming thread on the coilover shaft away from the second gear to form the product; and a positioning post passing through the coilover shaft and fixed to the female mold to limit the coilover shaft. The coilover shaft can rotate relative to the positioning post. This high-precision coilover mold is suitable for processing products with small thread pitches and has high processing accuracy.

[0004] The shortcomings of the aforementioned patents are that, due to the toothed structure of the product, the tooth core connected to the toothed structure of the product needs to be disconnected from the product when the injection mold is opened so that the product can be removed from the mold. In the current situation, relying solely on gravity for material unloading may cause the product to get stuck in the mold. Summary of the Invention

[0005] The purpose of this invention is to provide a telescopic coiling mold to overcome the above-mentioned shortcomings in the prior art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: A telescopic coiling die includes a movable seat and a fixed seat that are movably connected to each other. The movable seat is provided with a coiling mechanism, which includes an outer insert and an inner insert disposed therein. The fixed seat is also provided with a pushing mechanism. During the retraction and material retraction process of the coiling mechanism, the movable seat drives the pushing mechanism to push the workpiece out of the die.

[0007] In the aforementioned telescopic coiled die, a threaded shaping part is provided on the top outer wall of the outer insert, and the threaded shaping part is used to form the internal thread of the machined part.

[0008] The aforementioned telescopic coiled tooth mold includes an outer insert comprising a plurality of first outer insert elements arranged in a circumferential array and a plurality of second outer insert elements arranged in a circumferential array. The outer insert has a first state and a second state. In the first state, the outer contours of the first outer insert elements and the outer contours of the second outer insert elements form the outer contour of the outer insert. In the second state, the first outer insert elements and the second outer insert elements simultaneously retract radially inward, at which time the outer contour of the first outer insert elements forms the outer contour of the outer insert.

[0009] The aforementioned telescopic coiled tooth mold has three first outer insert elements and three second outer insert elements on the outer insert.

[0010] In the aforementioned telescopic coiled tooth mold, the first and second outer elements are arc-shaped bodies, each including an outer arc and an inner arc. The outer arc of the arc-shaped body is curved, and its inner arc is a slope. The outer arc length of the first outer element is greater than that of the second outer element, and the inner arc length of the first outer element is greater than that of the second outer element.

[0011] In the aforementioned telescopic coiling die, the inner sides of the multiple first outer inserts are provided with outer sliding grooves, the inner sides of the multiple second outer inserts are provided with outer sliders, and the inner inserts are arranged in a circumferential array with multiple inner sliding grooves and multiple inner sliders. The outer sliding grooves and the inner sliders correspond one-to-one, and the outer sliders and the inner sliding grooves correspond one-to-one.

[0012] The aforementioned telescopic threaded die also includes a die base with a die hole formed thereon. When one end of the threaded die mechanism is inserted into the die hole, the internal thread of the workpiece is processed.

[0013] The aforementioned telescopic auger mold, wherein the pushing mechanism includes a bidirectional screw, a pushing block, and a pushing seat, the fixed seat is provided with a through opening, the pushing block is slidably connected to the through opening, one end of the bidirectional screw is connected to the movable seat, and the other end of the bidirectional screw is connected to the pushing block. During the rotation stroke of the bidirectional screw, the bidirectional screw drives the movable seat to move so that the auger mechanism retracts and retracts while driving the pushing seat to push the workpiece out of the mold.

[0014] In the aforementioned telescopic coiled tooth mold, the length of the pushing block is less than the length of the through-hole.

[0015] In the aforementioned telescopic coiling die, the fixed seat and the pushing seat are elastically connected by an elastic element.

[0016] In the above technical solution, the present invention provides a telescopic coiling die, including a movable seat and a fixed seat that are movably connected to each other. The fixed seat is provided with a coiling mechanism. The coiling mechanism is provided with an outer insert and an inner insert disposed inside it. The outer insert and the inner insert slide relative to each other to form a workpiece. At this time, the pushing mechanism on the movable seat drives the movable seat to drive the pushing mechanism to push the workpiece out of the die. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this invention. For those skilled in the art, other drawings can be obtained based on these drawings.

[0018] Figure 1 This is a schematic diagram of the structure of the telescopic coiling mold provided in an embodiment of the present invention; Figure 2 This is a schematic diagram of the coiling mechanism of the telescopic coiling mold provided in the embodiment of the present invention when the mold is in the closed state; Figure 3 This is a schematic diagram of the coiling mechanism of the telescopic coiling mold provided in the embodiment of the present invention when the mold is in the open state; Figure 4 This is a cross-sectional view of the telescopic coiling mold provided in an embodiment of the present invention; Figure 5 A cross-sectional view of the coiling mechanism of a telescopic coiling mold provided in another embodiment of the invention when the mold is in the closed state; Figure 6 A cross-sectional view of the coiling mechanism of a telescopic coiling mold provided in another embodiment of the invention when the mold is in the open state; Figure 7 A cross-sectional view of the coiling mechanism of a telescopic coiling mold provided in yet another embodiment of the invention when the mold is in the closed state. Figure 8 A cross-sectional view of the coiling mechanism of a telescopic coiling mold provided in another embodiment of the invention when the coiling mechanism is in the open mold state; Figure 9 This is a schematic diagram of the coiling mechanism of a telescopic coiling mold provided in another embodiment of the invention when the coiling mechanism is in the open mold state.

[0019] Explanation of reference numerals in the attached figures: 1. Movable seat; 2. Fixed seat; 2.1. Through-hole; 3. Push seat; 4. Mold seat; 4.1. Mold hole; 5. Tightening mechanism; 5.1. Threaded shaping part; 5.2. Outer insert; 5.3. Inner insert; 5.21. First outer insert element; 5.22. Second outer insert element; 5.211. Outer slide groove; 5.221. Outer slider; 5.31. Inner slide groove; 5.32. Inner slider; 5.4. Hollow channel; 6. Groove; 7. Elastic element; 8. Push block; 9. Pushing mechanism; 9.1. Push rod; 9.11. Push end; 9.2. First threaded section; 9.3. Second threaded section; 9.4. Drive shaft; 9.5. Motor; 9.6. Bidirectional screw; 10. Drive mechanism; 11. Locking mechanism; 11.1. Connecting rod; 11.2. Locking ring; 11.3. Spring. Detailed Implementation

[0020] To enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0021] The structures, proportions, and sizes depicted in the accompanying drawings of this specification are merely for illustrative purposes and to aid those skilled in the art in understanding and reading the content disclosed herein. They are not intended to limit the scope of the invention and therefore have no substantial technical significance. Any modifications to the structure, changes in proportions, or adjustments to size, without affecting the effectiveness and objectives of the invention, should still fall within the scope of the technical content disclosed herein. Furthermore, the terms such as "upper," "lower," "left," "right," "middle," and "one" used in this specification are merely for clarity and not intended to limit the scope of the invention. Changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered within the scope of the invention's implementation.

[0022] For ease of description and not for limitation of rights, the direction facing the movable seat 1 in this specification is left, and the direction facing the push seat 3 is right, that is... Figure 4 The direction shown is the top end, which faces the threaded molding part on the outer insert, and the other end is the bottom end.

[0023] Reference Figure 1-9 This invention provides a telescopic retractable threading die. A fixed base 2 is fixed on a foundation such as a machine tool base. A threading mechanism 5 is provided on the fixed base 2. A movable base 1 is movable relative to the fixed base 2. The threading mechanism includes an outer insert 5.2 and an inner insert 5.3 disposed inside it. A pushing mechanism 9 is also provided on the movable base 1. During the retraction and material retraction process of the threading mechanism 5, the movable base 1 drives the pushing mechanism 9 to push the workpiece out of the die.

[0024] Specifically, the telescopic threaded die provided in this embodiment is used to machine internal threads, also known as threading, onto the workpiece through the threaded die mechanism 5. The process of machining the internal thread involves the expansion stroke of the threaded die mechanism 5 to enter the mold closing state, while the contraction stroke corresponds to the material ejection stroke and the mold opening state. Figure 1As shown, the telescopic coilover mold includes a movable seat 1 and a fixed seat 2 that are movably connected to each other. The movable seat 1 can be trapezoidal in shape, and the fixed seat 2 is preferably a fixed cuboid. The movable seat 1 can move relative to the fixed seat 2 along the axis of the coilover mechanism 5. The coilover mechanism 5 is provided on the fixed seat 2. The coilover mechanism includes an outer insert 5.2 and an inner insert 5.3 movably disposed inside it. One end of the inner insert 5.3 is inserted into the outer insert 5.2, and the other end is connected to the movable seat 1. Preferably, the outer insert 5.2 is a frustum with a threaded shaping part 5.1. The top and bottom ends of the outer insert 5.2 are open. The inner insert 5.3 is a cone with a flat top. The outer wall of the top end of the insert 5.2 is provided with a threaded shaping part 5.1, which is used to form the internal thread of the machined part. Preferably, the insert 5.2 includes a plurality of first insert elements 5.21 arranged in a circumferential array and a plurality of second insert elements 5.22 arranged in a circumferential array (four or five are also possible). Preferably, there are three first insert elements 5.21 and three second insert elements 5.22. The top and bottom ends of the first insert elements 5.21 are arc-shaped, so that the top and bottom ends are connected to form an arc-shaped body. That is, the outer arc of the arc-shaped body is arc-shaped, and the inner arc is a slope (a chord of the insert 5.2). The second insert elements 5.22 are also arc-shaped, but the difference is that the second insert elements 5.21 are arc-shaped. The arc length of the outer arc of the second outer element 5.22 is less than the arc length of the outer arc of the first outer element 5.22, and the chord length of the second outer element 5.22 is less than the chord length of the first outer element 5.22. Both sides of the second outer element 5.22 are inclined surfaces, the purpose of which is that, due to the relatively smooth inclined surfaces, it can shrink radially during the shrinkage process. The three first outer elements 5.21 and the three second outer elements 5.22 are arranged in a ring around the outer element in an alternating order of first outer element 5.21 and second outer element 5.22. The outer element 5.2 has a first state and a second state. In the first state, the outer contour of the outer element 5.2 is formed by the outer contour of the first outer element 5.21 and the outer contour of the second outer element 5.22. That is, at this time, the outer contour of the outer element 5.2 is... The radial dimension of the outline is at its maximum. In the second state, as the inner insert 5.3 is driven by the movable seat 1 to move towards the bottom end of the outer insert 5.2, the first outer insert element 5.21 and the second outer insert element 5.22 simultaneously contract radially inward, and the inward contraction speed of the second outer insert element 5.22 is faster than that of the first outer insert element 5.21. At this time, the outer outline of the first outer insert element 5.21 forms the outer outline of the outer insert 5.2, that is, the radial dimension of the outer outline of the outer insert 5.2 gradually decreases. The threaded mechanism 5 has a mold-closed state and a mold-opening state. In the mold-closed state, the outer insert 5.2 is in the first state, at which time the inner insert 5.3 is completely inserted into the outer insert 5.2, and the first outer insert element 5.21 and the second outer insert element 5.22...The outer contour of 22 forms the inner contour of the workpiece, at which point the workpiece can be injection molded onto the threaded shaping part 5.1; in the mold-opening state, the movable seat 1 drives the inner insert 5.3 to move to the left, that is, at this time the inner insert 5.3 moves toward the bottom end of the outer insert 5.2, at which point the outer insert 5.2 is in the second state, and the workpiece can disengage from the threaded retractor mechanism 5, which is the process of the threaded retractor mechanism 5 shrinking and retracting material. The movable seat 1 is also provided with a pushing mechanism 9, such as... Figure 4 As shown, the pushing mechanism 9 includes a pushing rod 9.1 and a pushing seat 3. One end of the pushing rod 9.1 passes through the movable seat 1 and the fixed seat 2, which is the pushing end 9.11. The other end is fixedly connected to the pushing seat 3. The pushing seat 3 is slidably sleeved on the threaded mechanism 5. That is, the movable seat 1, the fixed seat 2 and the pushing seat 3 are arranged in sequence from left to right. When the threaded mechanism 5 is in the mold opening state, the pushing end 9.11 on the pushing rod 9.1 can be driven to move to the right by a driving mechanism 10 to drive the pushing seat 3 to move to the right to push the workpiece to complete the unloading of the workpiece.

[0025] Furthermore, the inner side of the first outer inlay element 5.21 is provided with an outer sliding groove 5.211, and the inner side of the second outer inlay element 5.22 is provided with an outer slider 5.221. One end of the inner inlay 5.3 is inserted into the outer inlay 5.2, and the other end is fixedly connected to the movable seat 1. The inner inlay 5.3 is circumferentially arrayed with a plurality of inner sliding grooves 5.31 and a plurality of inner sliders 5.32. Preferably, it is provided with three inner sliding grooves 5.31 and three inner sliders 5.32, and three outer sliding grooves 5.211 and three outer sliders 5.221. The outer sliding grooves and the inner sliders 5.32 correspond one-to-one. The outer sliders 5.221 and the inner sliders 5.221 correspond one-to-one. The inner slide grooves 5.31 correspond one-to-one, meaning the outer slider 5.221 can move along the inner slide groove 5.31, and the inner slider 5.32 can move along the outer slide groove 5.211. Preferably, the outer slide groove 5.211 and the inner slider 5.32 are the same size, and the inner slide groove 5.31 and the outer slide groove 5.211 are the same size. Both the inner slider 5.32 and the outer slider 5.221 are inverted trapezoids, and the inner slide groove 5.31 and the outer slide groove 5.211 are also corresponding inverted trapezoids. This allows for precise sliding between the outer insert 5.2 and the inner insert 5.3, when the threaded mechanism 5 is in the mold-closing state. At this time, the inner slider 5.32 moves towards the top along the outer slide groove 5.211, and the outer slider 5.221 moves towards the top along the inner slide groove 5.31, so that the inner insert 5.3 is completely inserted into the outer insert 5.2. At this time, the outer insert 5.2 is also in the first state. In the mold opening state, the movable seat 1 drives the inner insert 5.3 to move to the left, so that the inner slider 5.32 moves towards the bottom of the outer insert 5.2 along the outer slide groove 5.211. Since the sliders and slide grooves on the first outer insert 5.21 and the second outer insert 5.22 are both inverted trapezoids, their fit is tight, and there is only movement in the axial direction. As the inner slide groove 5.31 moves along the outer slider 5.221 toward the bottom of the outer insert 5.2, the outer diameter of the resulting outer contour becomes smaller. That is, both the outer insert 5.2 and the inner insert 5.3 shrink radially inward. At this time, the workpiece can be separated from the auger mechanism 5, which is the process of the auger mechanism 5 shrinking and retracting. While the inner insert 5.3 moves axially, there is a probability that it will be misaligned, affecting the quality of the workpiece. The outer slide groove 5.211 and the inner slider 5.32 are set to correspond one-to-one. The purpose of the one-to-one correspondence between the outer slider 5.221 and the inner slide groove 5.31 is to play a guiding role in completing the mold closing and opening of the auger mechanism.

[0026] In another embodiment of the present invention, a mold base 4 is further included. The mold base 4 is movably connected to the fixed base 2. The mold base 4 is driven by a driving mechanism to move relative to the fixed base along the axial direction of the threaded joint mechanism 5. The driving mechanism can be a driving rod that drives the mold base 4 to move axially along the threaded joint mechanism 5. This is prior art and will not be described in detail. A mold hole 4.1 is formed on the mold base 4. Preferably, the mold hole 4.1 is a circular hole adapted to the outer insert 5.2. After one end of the threaded joint mechanism 5 is inserted into the mold hole 4.1, plastic material to be formed into the mold hole 4.1 is injected into the mold hole 4.1. Then, threaded joint processing is performed (that is, the switching process between the first state and the second state mentioned above). After the part is formed, the mold base 4 moves to the right away from the fixed base 2 under the drive of the driving mechanism. After the material is unloaded, it returns to its original position to continue forming the part. This process is repeated.

[0027] The present invention provides a telescopic threading die, comprising a movable seat 1 and a fixed seat 2 connected relative to each other. The fixed seat 2 is provided with a threading mechanism 5, wherein the threading mechanism is provided with an outer insert 5.2 and an inner insert 5.3 disposed inside it. The outer insert 5.2 and the inner insert 5.3 slide relative to each other to complete the processing of the internal thread of the workpiece. At this time, the pushing mechanism on the movable seat 1 drives the movable seat 1 to drive the pushing mechanism to push the workpiece out of the die.

[0028] In another embodiment provided by the present invention, such as Figure 5-6As shown, the pushing mechanism 9 includes a bidirectional screw 9.6, a pushing block 8, and a pushing seat 3. The drive shaft 9.4 of a fixed motor 9.5 is the bidirectional screw 9.6. As the name suggests, the bidirectional screw 9.6 is provided with a first threaded section 9.2 and a second threaded section 9.3 in sequence, and the thread directions of the first threaded section 9.2 and the second threaded section 9.3 are opposite. The first threaded section 9.2 is closer to the motor 9.5 and is screwed to the movable seat 1, and the second threaded section 9.3 is screwed to the pushing block 8. The fixed seat 2 is provided with a through-hole 2.1, and the pushing block 8 is slidably connected to the through-hole 2.1. Preferably, the pushing... The length of block 8 is less than the length of the through-hole 2.1. The push seat 3 is slidably sleeved on the auger mechanism 5. That is, the movable seat 1, the fixed seat 2, and the push seat 3 are arranged sequentially from left to right. The fixed seat 2 is also provided with a groove 6. An elastic element 7 is provided in the groove 6. Preferably, the elastic element 7 is a spring. One end of the elastic element 7 is connected to the groove wall of the groove 6, and the other end is connected to the push seat 3. During the rotation stroke of the bidirectional screw 9.6, when the bidirectional screw 9.6 drives the movable seat 1 to move to the left, the auger mechanism 5 retracts and retracts the material, while simultaneously driving the push seat 3 to move to the right to push the workpiece out of the machine. The drive shaft 9.4 of the motor 9.5, i.e., the bidirectional screw 9.6, rotates. The first threaded section 9.2 of the bidirectional screw 9.6 rotates, causing the movable seat 1 to move to the left. At this time, the movable seat 1 causes the inner insert 5.3 on the threaded mechanism 5 to move to the left, i.e., the threaded mechanism 5 is in the open mold state. While the first threaded section 9.2 of the bidirectional screw 9.6 rotates, causing the movable seat 1 to move to the left, the second threaded section 9.3 of the bidirectional screw 9.6 causes the push block 8 to move to the right. At this time, the push block 8 presses against the push seat 3, pushing the workpiece away from the threaded shaping part 5.1. Since the length of the push block 8 is less than the length of the through-hole 2.1, the threaded part is first detached from the threaded shaping part 5.1. When the tooth mechanism 5 is in the closed state, it forms a workpiece. Then, the movable seat 1 moves, causing the tooth mechanism 5 to be in the open state while pushing the workpiece away from the threaded shaping part 5.1. That is, the movable seat 1 moves to the left first, and then the push seat 3 moves to the right. This way, the tooth mechanism forms the workpiece first, and then the push seat 3 pushes the workpiece out of the threaded shaping part 5.1 of the tooth mechanism 5. After the workpiece is unloaded, the elastic element 7 is used to reset the push seat 3 after the push block 8 is reset. In this way, the motor 9.5 drives the bidirectional screw 9.6 to passively complete the closed and open states of the tooth mechanism 5. During this process, the workpiece is also unloaded.

[0029] In another embodiment provided by the present invention, such as Figure 7-9As shown, the outer insert includes a first segment and a second segment. The length of the second segment is more than two-thirds of the length of the outer insert 5.2. The first segment is the top section of the outer insert 5.2. A first groove is provided on the inner wall of the second segment, i.e., on the inner walls of the first outer element 5.21 and the second outer element 5.22. The first groove is a sloping groove, and the side of the first groove near the top is a first wedge-shaped surface. A second wedge-shaped surface is provided on the top of the inner insert 5.3. When the threaded joint mechanism is in the closed state, the inner insert 5.3 and the outer insert 5.2 form the internal thread of the machined part, similar to the aforementioned stroke. When the threaded joint mechanism 5 is in the open state… The first outer element 5.21 and the second outer element 5.22 simultaneously contract radially inward. At this time, the inner part 5.3 will move towards the bottom. Since the outer part 5.2 is provided with a first groove, there is a certain gap between the outer wall of the inner part 5.3 and the inner wall of the outer part 5.2 due to the first groove. This causes the inner part 5.3 to wobble in the threaded part 5. In this way, the probability of jamming will be reduced when the threaded part 5 opens or closes. At this time, the contraction amplitude of the second outer element 5.22 and the first outer element 5.21 will increase, that is, the radial dimension of the outer part 5.2 will be smaller. This makes it easier for the processed part to detach from the threaded shaping part 5.1.

[0030] More preferably, the pushing block 8 of the pushing mechanism is a wedge-shaped block, with its surface near the pushing seat 3 being a third wedge-shaped surface. A locking mechanism 11 is provided inside the through-hole 2.1. The locking mechanism 11 includes a connecting rod 11.1 and an elastic locking ring 11.2. The upper end of the connecting rod 11.1 also has a fourth wedge-shaped surface, and the other end is connected to the locking ring 11.2. Preferably, the locking ring 11.2 is a notched ring, such as a two-thirds circular ring with the remaining one-third being a notch. A second groove is axially provided on the fixing seat 2, thus the connecting rod 11.1 with the fourth wedge-shaped surface... One end is located inside the through-hole 2.1, and the other end is located inside the second groove. The fourth wedge-shaped surface of the connecting rod 11.1 and the third wedge-shaped surface of the pushing block 8 cooperate with each other. That is, when the pushing block 8 moves to the right, the pushing block 8 will push the connecting rod 11.1 downward. A spring 11.3 is also provided on the connecting rod 11.1. One end of the spring 11.3 is connected to the fixed seat, and the other end is connected to the locking ring 11.2. The purpose of providing the spring 11.3 is to use elastic force to cause the locking mechanism 11 to reset. A locking groove is also provided on the fixed seat 2. The locking groove is annular to accommodate the locking ring. The downward movement of the connecting rod 11.1 simultaneously causes the locking ring 11.2 to have a locking stroke, during which it reaches a locking position where the locking ring 11.2 is fully locked onto the outer insert 5.2. When the threaded mechanism 5 is in the closed state, one end of the connecting rod 11.1 is located inside the through-hole 2.1, and the ring opening of the locking ring 11.2 is located on the threaded mechanism 5. When the threaded mechanism 5 is in the open state, the pushing block 8 pushes the connecting rod 11.1 downward, at which time the locking ring 11.2 moves downward along the locking groove. The locking ring 11.2 moves to the point where the radial diameter of the outer insert 5.2 is at its maximum. When the locking ring 11.2 is in its maximum opening position, and the inner ring wall of the locking ring 11.2 is completely attached to the outer wall of the outer insert 5.2, the locking ring 11.2 has completed the locking of the threaded mechanism 5. At this time, the slider and groove on the outer insert 5.2 are attached to the slider and groove on the inner insert 5.3. The purpose of this setting is that when the threaded mechanism 5 is in the shrinking and unloading position, it not only provides a better detachment environment for the workpiece, but also still has a guiding effect between the groove and slider on the outer insert 5.2 and the inner insert 5.3, and has a certain gap to reduce the probability of jamming when the threaded mechanism 5 opens the mold.

[0031] During the mold opening process, the inner insert 5.3 first detaches from the first segment. When it enters the second segment, there is a distance between the inner insert and the outer insert. At this time, the elastic locking ring 11.2 can intervene to drive the outer insert 5.2 to contract instantly, thus improving the demolding ability. During the mold closing process, the driving is achieved by the extrusion of the inner insert 5.3 and the outer insert 5.2. The transition between the first and second segments is achieved by the inclined surface.

[0032] In the prior art, as in the above embodiment, during driving, the inner insert 5.3 is driven to actively move backward, but the outer insert 5.2 is not actively driven. Therefore, the shapes of both the slider and the groove are set to inverted trapezoids (e.g., Figure 2-3 The fit is tight, and at this time, the axial movement of the inner insert 5.3 will passively drive the radial movement of the outer insert 5.2, so that the threaded mechanism 5 can complete the mold closing and opening. However, since the two driving directions are perpendicular to each other (axial movement drives radial movement), it also brings two disadvantages: first, the wear is too great, and second, there is a probability of jamming. However, in this embodiment, the above-mentioned inverted trapezoidal structure is eliminated. Figure 9 As shown), the slider or groove is trapezoidal in shape (or other shapes such as square), and still serves as a guide. However, the outer insert 5.2 may not be able to retract and reset at this point. The intervention of the locking ring 11.2 completes the contraction of the outer insert 5.2 (expansion can be achieved directly by the compression of the inner insert), thus greatly reducing jamming and wear. This is because a first groove is provided on one section of the outer insert 5.2, allowing it to wobble and reducing the probability of jamming. A locking mechanism 11 is also provided to lock it in place. Therefore, the mold closing and opening of the threaded mechanism 5 can be completed without a particularly tight fit, greatly reducing wear. It should be noted that in the preferred embodiment, a second outer insert 5.22 needs to be positioned directly below. This allows the locking ring 11.2 above half the arc to drive the entire outer insert 5.2, while the second outer insert 5.22 directly below can be driven by the compression of the two first outer inserts 5.21 on either side. However, in practice, the above preferred solution can also be omitted. It is permissible to allow the individual second outer element 5.22 and the first outer element 5.21 at the bottom not to extend or retract radially, so that the material removal is not greatly affected when the other elements are removed.

[0033] The foregoing has only described certain exemplary embodiments of the present invention by way of illustration. Undoubtedly, those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the foregoing drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A telescopic coiling die, comprising a movable seat and a fixed seat that are movably connected to each other, wherein a coiling mechanism is disposed on the fixed seat, the coiling mechanism comprising an outer insert and an inner insert disposed therein, characterized in that, The movable seat is also provided with a pushing mechanism. During the retraction and material retraction process of the threaded mechanism, the movable seat drives the pushing mechanism to push the workpiece out of the machine. The pushing mechanism includes a bidirectional screw, a pushing block, and a pushing seat. The fixed seat is provided with a through-hole, and the pushing block is slidably connected to the through-hole. One end of the bidirectional screw is connected to the movable seat, and the other end of the bidirectional screw is connected to the pushing block. During the rotation stroke of the bidirectional screw, the bidirectional screw drives the movable seat to move so that the threaded mechanism retracts and retracts while driving the pushing seat to push the workpiece out of the machine. The pushing block of the pushing mechanism is a wedge-shaped block, and its surface near the pushing seat is a third wedge-shaped surface. A locking mechanism is provided in the through-hole. The locking mechanism includes a connecting rod and an elastic locking ring. The upper end of the connecting rod also has a fourth wedge-shaped surface, and the other end is connected to the locking ring. The locking ring is a notched ring. A second groove is provided axially on the fixed seat. The fourth wedge-shaped surface of the connecting rod and the third wedge-shaped surface of the pushing block cooperate with each other. A spring is also provided on the connecting rod. One end of the spring is connected to the fixed seat, and the other end is connected to the locking ring. A locking groove is also provided on the fixed seat. The locking groove is annular to accommodate the locking ring. When the connecting rod moves downward, the locking ring has a locking stroke. There is a locking position on the locking stroke so that the locking ring is completely locked on the outer insert. When the coiling mechanism is in the closed state, one end of the connecting rod is located inside the through-hole, and the ring opening of the locking ring is located on the coiling mechanism. When the coiling mechanism is in the open state, the push block will push the connecting rod to move downward. At this time, the locking ring will move downward along the locking groove. When the locking ring moves to the position of the largest radial diameter of the outer insert, the locking ring will open to the maximum. When the inner ring wall of the locking ring is completely attached to the outer wall of the outer insert, the locking ring completes the locking of the coiling mechanism.

2. The telescopic coiling die according to claim 1, characterized in that, The outer wall of the insert is provided with a threaded shaping part, which is used to form the internal thread of the machined part.

3. The telescopic coiling die according to claim 1, characterized in that, The outer insert includes a plurality of first outer insert elements arranged in a circumferential array and a plurality of second outer insert elements arranged in a circumferential array. The outer insert has a first state and a second state. In the first state, the outer contours of the first outer insert elements and the outer contours of the second outer insert elements form the outer contour of the outer insert. In the second state, the first outer insert elements and the second outer insert elements simultaneously shrink radially inward, at which time the outer contour of the first outer insert elements forms the outer contour of the outer insert.

4. The telescopic coilover mold according to claim 3, characterized in that, The inlay is provided with three first inlay elements and three second inlay elements.

5. The telescopic coiling die according to claim 4, characterized in that, The first and second outlay elements are arc-shaped bodies, each comprising an outer arc and an inner arc. The outer arc of the arc-shaped body is curved, and its inner arc is a slope. The outer arc length of the first outlay element is greater than that of the second outlay element, and the inner arc length of the first outlay element is greater than that of the second outlay element.

6. The telescopic coiling die according to claim 5, characterized in that, The inner sides of the plurality of first out-mounted elements are provided with outer sliding grooves, and the inner sides of the plurality of second out-mounted elements are provided with outer sliding blocks. The in-mount is circumferentially arrayed with a plurality of inner sliding grooves and a plurality of inner sliding blocks. The outer sliding grooves and the inner sliding blocks correspond one-to-one, and the outer sliding blocks and the inner sliding grooves correspond one-to-one.

7. The telescopic coiling die according to claim 1, characterized in that, It also includes a mold base with a mold hole formed thereon, and when one end of the threaded mechanism is inserted into the mold hole, the internal thread of the workpiece is processed.

8. The telescopic coiling die according to claim 1, characterized in that, The length of the push block is less than the length of the through opening.

9. The telescopic coiling die according to claim 7, characterized in that, The fixed seat and the pushing seat are elastically connected by an elastic element.

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