Auxiliary ejection device of numerical control core moving machine for metal belt production

Abstract

The invention provides an auxiliary ejection device of a numerical control core moving machine for metal belt production. A pneumatic internal expansion clamp and a pneumatic mechanism are arranged at the front end of a main shaft of the numerical control core moving machine; the internal expansion chuck is connected with the front end of the connecting seat and comprises a plurality of movable split parts which are arranged in the circumferential direction, and the internal expansion ejector rod is movably arranged in the centers of the movable split parts; the outer jacking spring piece is movably sleeved outside the inner expansion chuck; the pneumatic mechanism is in driving connection with the internal expanding ejector rod, and in the machining process of small-size workpieces such as metal belts, the internal expanding ejector rod is driven to move forwards, so that all the movable sections of the internal expanding chuck expand outwards to position the workpieces, and the external ejecting spring piece is pushed by the workpieces to be in a compressed state; after machining is completed, the inner expanding ejector rod is driven to move backwards, all the movable split pieces of the inner expanding chuck elastically contract, the outer ejecting spring piece pushes the workpiece to be separated from the inner expanding chuck, workers do not need to pull out and take down the workpiece from the outer expanding chuck manually any more, the speed of batch production of the workpiece is increased, and the device is suitable for automatic production of small-size workpieces such as metal belts.

Description

Technical Field

[0001] The invention relates to the technical field of CNC core-moving machines, and in particular provides an auxiliary ejection device of a CNC core-moving machine for producing metal belts, which is used for the automated production of small-sized workpieces such as metal belts. Background Art

[0002] The full name of CNC core-moving machine is core-moving CNC lathe, which can also be called spindle box mobile CNC automatic lathe, economical turning and milling compound machine tool or longitudinal cutting lathe. CNC core-moving machine is a precision processing equipment, which has a qualitative leap in processing efficiency and processing accuracy compared with CNC lathe. Due to the use of double-axis arrangement tools, the processing cycle time is greatly reduced. It is mainly used for batch processing of precision hardware and shaft-type special-shaped non-standard parts. CNC core-moving machine can complete multiple processing processes such as turning, milling, drilling and grinding in a single clamping, and is especially suitable for processing high-precision small shaft and cylinder parts, and is increasingly in demand by processing companies.

[0003] At present, in the process of using CNC core-moving machines to process metal straps for watch decoration, traditional machine tool fixtures cannot be used in conjunction. When processing workpieces such as the above-mentioned metal straps, it is necessary to install a special mechanical internal expansion chuck at the front end of the spindle to tighten and position the inner hole of the workpiece, leaving space for the outer surface and end face processing of the tube. After the processing is completed, the workpiece cannot be automatically detached from the shrunk mechanical internal expansion chuck, and workers are required to manually pull the workpiece out and remove it, which reduces work efficiency and cannot be connected with automated assembly line production. Moreover, the current mechanical internal expansion chucks generally adopt a single-end expansion method, which only tightens and supports the front end of the inner hole of the workpiece. When the workpiece is long, the single-end expansion and tightening method of the above-mentioned internal expansion chuck cannot guarantee the firmness and positioning accuracy of the support positioning, affecting the processing quality. Summary of the invention

[0004] Based on this, the present invention provides an auxiliary ejection device of a CNC core-moving machine for the production of metal strips, so as to realize the fast and high-precision clamping of small-sized workpieces such as metal strips, and after the processing is completed, the small-sized workpieces such as metal strips can be automatically detached from the internal expansion chuck, thereby improving the speed of mass production of workpieces and reducing labor intensity.

[0005] In order to achieve the above-mentioned purpose, the technical scheme of the present invention is as follows: an auxiliary ejection device of a CNC core-moving machine for metal strip production, comprising a pneumatic internal expansion clamp and a pneumatic mechanism arranged at the front end of the spindle of the CNC core-moving machine; the pneumatic internal expansion clamp comprises a connecting seat, an internal expansion chuck, an internal expansion ejector rod and an external ejector spring member; the connecting seat is connected to the front end of the spindle and is coaxially arranged; the internal expansion chuck is connected to the front end of the connecting seat, comprises a plurality of circumferentially arranged movable petals, the inner expansion ejector rod is movably arranged at the center of the plurality of movable petals; the external ejector spring member The pneumatic mechanism is movably mounted outside the inner expansion chuck; the pneumatic mechanism is drivably connected to the inner expansion ejector rod and is configured as follows: during the processing of small-sized workpieces such as metal strips, the inner expansion ejector rod is driven to move forward, so that the movable petals of the inner expansion chuck expand outward to position the workpiece, and the outer ejector spring member is pushed to a compressed state by the workpiece; after the processing is completed, the inner expansion ejector rod is driven to move backward, the movable petals of the inner expansion chuck elastically shrink, and the outer ejector spring member pushes the workpiece out of the inner expansion chuck, so that the worker no longer needs to manually pull the workpiece out of the outer expansion chuck to remove it.

[0006] Optionally, the internal expansion rod extends to the front end of the internal expansion chuck, and the front end of the internal expansion chuck is provided with a first conical cavity, and the rear end is provided with a second conical cavity. The front end of the internal expansion rod is provided with a first conical platform adapted to the first conical cavity, and the rear end is provided with a second conical platform adapted to the second conical cavity, so that the front and rear ends of each movable petal of the internal expansion chuck are supported at the same time, thereby improving the front and rear consistency of the opening of each movable petal, being suitable for supporting and positioning workpieces with a longer length, and improving the firmness and positioning accuracy.

[0007] Optionally, at least one third conical cavity is provided in the middle of the internal expansion chuck, and a third conical platform adapted to each of the third conical cavities is provided in the middle part of the internal expansion push rod, so that the front and rear ends and the middle part of each movable petal of the internal expansion chuck are synchronously supported, thereby improving the overall stiffness of each movable petal after opening, so as to achieve the support and positioning of the front and rear ends and the middle part of a workpiece with a longer length, thereby improving the firmness and positioning accuracy.

[0008] Optionally, the outer top spring member is a spiral spring structure, the front end of the outer top spring member is movably mounted outside each movable petal of the inner expansion chuck, and the rear end is fixedly installed on the rear end of the inner expansion chuck.

[0009] Optionally, the external push spring member includes a large diameter portion and a small diameter portion connected front and back, the large diameter portion is gap-matched with each movable petal of the inner expansion chuck, and the small diameter portion is elastically supported and connected to the rear end of the external expansion chuck. When the movable petals of the outer expansion chuck expand outward, the small diameter portion expands to an expanded diameter state. When the inner expansion push rod loses support for the movable petals, the small diameter portion generates an elastic contraction force on the movable petals, driving the inner expansion chuck to quickly and completely contract, which helps the workpiece to quickly detach and prevent it from being stuck on the incompletely contracted inner expansion chuck.

[0010] Optionally, the pneumatic mechanism includes a cylinder body and a plunger body, the cylinder body is arranged in the main shaft, the plunger body is movably arranged in the cylinder body, the plunger rod at the front end of the plunger body is extended from the connecting seat and connected to the inner expanding push rod, the plunger body drives the inner expanding push rod to move forward, and drives the movable petals of the inner expanding chuck to expand outward; the plunger body drives the inner expanding push rod to move backward, and the movable petals of the inner expanding chuck lose the support of the inner expanding push rod and elastically shrink. It has a simple structure and is easy to control, and is suitable for the installation of the main shaft of a CNC core-moving machine.

[0011] Optionally, the rear end of each conical cavity is connected to a cylindrical cavity whose outer diameter is larger than the outer diameter of the large end of the cone, and the stroke of the inner expansion rod is limited by the length of the cylindrical cavity; the cylinder body is provided with a stroke retaining ring, and the stroke of the plunger body is limited by the stroke retaining ring, and the stroke of the inner expansion rod is not less than the stroke of the plunger body.

[0012] Optionally, a return spring member is sleeved on the plunger rod. During processing, the plunger body moves forward to compress the return spring member. After the processing is completed, the return spring member in the compressed state drives the plunger body to retreat.

[0013] Optionally, the front end of the main shaft is connected to the connecting seat via a connecting tube, the connecting tube is provided with a sealing member that seals with the plunger rod, the front end of the reset spring member extends into the connecting tube, and the rear end abuts against the plunger body.

[0014] Optionally, the pneumatic mechanism is connected to a power air source, which is connected to the rodless chamber and the rod chamber of the cylinder body through a reversing valve, and is configured to control the movement of the internal expansion chuck through the reversing of the reversing valve: during the workpiece processing, the power air source is connected to the rodless chamber to drive the plunger body forward, and each movable petal expands to position the workpiece; when the workpiece processing is completed, the power air source is connected to the rod chamber to drive the plunger body backward, and each movable petal elastically contracts, thereby increasing the contraction speed of the internal expansion chuck.

[0015] The technical advantages of the auxiliary ejection device of the CNC core-moving machine for metal belt production provided by the present invention are at least reflected in:

[0016] 1. The driving mechanism drives the inner expansion ejector rod to move forward, and drives the movable petals of the inner expansion chuck to expand synchronously, so as to support and quickly clamp and position the inner hole of small-sized workpieces such as metal strips, facilitate the rapid progress of subsequent processing, and improve work efficiency;

[0017] 2. When a small-sized workpiece such as a metal strip is clamped and positioned by the inner expansion chuck, the outer top spring part that is movably mounted outside the inner expansion chuck is compressed to a contracted state. When the processing is completed, the inner expansion chuck contracts and no longer supports the inner hole of the workpiece. The workpiece is ejected from the inner expansion chuck by the outer top spring part, and no worker needs to remove it manually, nor does it require external power drive. The overall structure is simple and easy to operate, and it is suitable for the production process of batch production of workpieces;

[0018] 3. The internal expansion ejector rod passes through the entire depth of the internal expansion chuck, which improves the overall rigidity of the internal expansion chuck, firmly supports the workpiece and accurately positions it. It is suitable for the overall internal expansion support and positioning of workpieces with longer lengths, ensuring the processing accuracy and quality;

[0019] 4. The internal expansion chuck is supported synchronously by multiple supporting points of the internal expansion ejector rod, which also reduces the force on each supporting point, so that the force is evenly distributed and the service life of the supporting contact surface is increased;

[0020] 5. The provided internal expansion chuck is installed at the front end of the spindle and is driven by a pneumatic mechanism arranged inside the spindle. It matches the spindle structure and the working process of the external top spring part does not require external power drive. It is suitable for use in CNC core-moving machines, especially for supporting and positioning small-sized workpieces such as metal belts. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0022] Figure 1 It is a structural schematic diagram of an auxiliary ejection device of a CNC core-moving machine for metal belt production provided according to an embodiment of the present invention;

[0023] Figure 2 This is an axial cross-sectional view of an auxiliary ejection device of a CNC core-moving machine for metal belt production provided according to an embodiment of the present invention; (the inner expansion chuck is in an expanded state)

[0024] Figure 3 yes Figure 2 A partial enlarged view of point A; (the inner expansion chuck is in the expanded state)

[0025] Figure 4 It is a schematic diagram of the state where the workpiece is clamped and positioned;

[0026] Figure 5 This is an axial cross-sectional view of an auxiliary ejection device of a CNC core-moving machine for metal strip production provided according to an embodiment of the present invention; (the internal expansion chuck is in a contracted state)

[0027] Figure 6 yes Figure 5 A partial enlarged view of point A; (the internal expansion chuck is in the contracted state)

[0028] Figure 7 It is a schematic diagram of the state of the workpiece after being ejected by the external ejector spring;

[0029] Figure 8is a schematic structural diagram of an outer top spring member provided according to an embodiment of the present invention;

[0030] Fig. 9 This is a partial axial cross-sectional view of an auxiliary ejection device of a CNC core-moving machine for metal strip production provided according to another embodiment of the present invention; (the internal expansion chuck is in a contracted state)

[0031] Fig.10 It is a partial axial cross-sectional view of an auxiliary ejection device of a CNC core-moving machine for metal strip production provided according to another embodiment of the present invention; (the inner expansion chuck is in an expanded state)

[0032] Fig.11 This is a schematic diagram of a longer workpiece being clamped and positioned;

[0033] Fig.12 It is a flowchart of the working process of the auxiliary ejection device of the CNC core-moving machine provided for the production of metal strips.

[0034] Description of the accompanying drawings:

[0035] 1-spindle, 11-cylinder body, 12-travel retaining ring;

[0036] 2-connecting seat, 21-sealing member;

[0037] 3-inner expansion chuck, 31-movable petal, 32-first conical cavity, 33-second conical cavity, 34-third conical cavity;

[0038] 4-external top spring member, 41-large diameter portion, 42-small diameter portion;

[0039] 5- plunger body;

[0040] 6-return spring;

[0041] 7-inner expansion rod, 71-first conical platform, 72-second conical platform, 73-third conical platform;

[0042] 8-Connecting tube;

[0043] 9-Workpiece. DETAILED DESCRIPTION

[0044] When processing small-sized workpieces such as metal strips, the current CNC core-moving machines use an internal expansion chuck at the front end of the spindle to position the workpiece. After processing, the workpiece cannot be automatically detached from the shrunk mechanical internal expansion chuck, and workers need to manually pull the workpiece out to remove it, which reduces work efficiency and cannot be connected with automated assembly line production. Moreover, the current mechanical internal expansion chucks generally use a single-end expansion method, which only tightens and supports the front end of the inner hole of the workpiece. When the workpiece is long, the single-end expansion and tightening method of the internal expansion chuck cannot guarantee the firmness and positioning accuracy of the support positioning, affecting the processing quality.

[0045] To this end, the present invention provides an auxiliary ejection device of a CNC core-moving machine for the production of metal strips, so as to realize fast and high-precision clamping of workpieces, and after processing, realize automatic detachment of small-sized workpieces such as metal strips from the inner expansion chuck, thereby improving the speed of mass production of workpieces and reducing labor intensity.

[0046] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0047] It should be noted that the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified. "Multiple" means two or more. Unless otherwise clearly specified and defined, the terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection: it can be directly connected, it can be indirectly connected through an intermediate medium, and it can be the internal connection of two elements.

[0048] like Figures 1 to 11As shown, an embodiment of an auxiliary ejection device of a CNC core-moving machine for metal strip production provided by the present invention, the auxiliary ejection device provided is arranged at the front end of the spindle of the CNC core-moving machine, including a pneumatic internal expansion clamp and a pneumatic mechanism arranged at the front end of the spindle 1; the pneumatic internal expansion clamp includes a connecting seat 2, an internal expansion chuck 3, an internal expansion ejector rod 7 and an external ejection spring member 4; the connecting seat 2 is connected to the front end of the spindle 1 and is coaxially arranged; the internal expansion chuck 3 is connected to the front end of the connecting seat 2, and includes a plurality of movable petals 31 arranged circumferentially, and the inner expansion ejector rod 7 is movably arranged on the plurality of movable petals 31 Center; the outer push spring member 4 is movably mounted outside the inner expansion chuck 3; the pneumatic mechanism is drivingly connected to the inner expansion push rod 7, and is configured as follows: during the processing, the inner expansion push rod 7 is driven to move forward, so that the movable petals 31 of the inner expansion chuck 3 expand outward to position the workpiece 9, and the outer push spring member 4 is pushed to a compressed state by the workpiece 9; after the processing is completed, the inner expansion push rod 7 is driven to move backward, the movable petals 31 of the inner expansion chuck 3 elastically shrink, and the outer push spring member 4 pushes the workpiece 9 out of the inner expansion chuck 3, and the worker no longer needs to manually pull the workpiece 9 out of the outer expansion chuck to remove it.

[0049] like Fig.12 As shown, based on the above embodiments, the working process of the auxiliary ejection device of the CNC core-moving machine for metal belt production is provided:

[0050] S100. Loading the workpiece: the inner expansion rod 7 is in a backward state, and does not support the movable petals 31 of the inner expansion chuck 3. The movable petals 31 are in a contracted state close to the center, and the outer top spring member 4 is in a relatively long extended state. The workpiece 9 is axially mounted outside the movable petals 31, and the workpiece 9 applies pressure to the outer top spring member 4, and the outer top spring member 4 is transformed into a compressed state;

[0051] S200. Workpiece positioning: The plunger body 5 of the pneumatic mechanism moves forward, driving the inner expansion ejector rod 7 to move forward, and the conical platform of the inner expansion ejector rod 7 applies a force to tighten and expand the conical cavity of the inner expansion chuck 3, and each movable petal 31 expands outward synchronously, and the inner hole of the workpiece is clamped and positioned;

[0052] S300. Workpiece processing: When the workpiece 9 is clamped and positioned by the inner expansion chuck 3, the spindle 1 drives the workpiece 9 to rotate, and the tool of the CNC core machine is controlled to move toward the workpiece 9 to process the rotating workpiece 9;

[0053] S400. Workpiece ejection: After the workpiece is processed, the plunger body 6 of the pneumatic mechanism moves backward, driving the internal expansion rod 7 to move backward, and the conical platform of the internal expansion rod 7 is separated from the conical cavity of the internal expansion chuck 3 and no longer applies internal expansion force. The movable petals 31 elastically shrink and move toward the center, and the movable petals are separated from the inner hole of the workpiece 9. The external ejector spring member 4 releases its elasticity from the compressed state, and the workpiece 9 is automatically ejected.

[0054] Therefore, an auxiliary ejection device of a CNC core-moving machine for the production of metal strips is provided. The inner expansion ejector rod is driven by a driving mechanism to drive the inner expansion chuck 3 to expand, so as to realize rapid clamping of the workpiece 9. At the same time, the elastic energy storage of the outer ejector spring member 4 drives the inner expansion ejector rod to contract and release the workpiece through the driving mechanism. The outer ejector spring member ejects the workpiece from the inner expansion chuck. It is suitable for the inner hole support and rapid clamping and positioning of small-sized workpieces such as metal strips, and can realize rapid and high-precision clamping of the workpiece, and automatic detachment of the workpiece from the inner expansion chuck. The automatic ejection process of the workpiece does not require workers to remove it manually, nor does it require external power drive, thereby improving the degree of automation and reducing labor intensity. The overall structure is simple and easy to operate. It is suitable for use in CNC core-moving machines and for automated production processes.

[0055] like Figure 1 As shown, the outer top spring member 4 is a coil spring structure, the front end of the outer top spring member 4 is movably mounted outside each movable petal 31 of the inner expansion chuck 3, and the rear end is fixedly mounted on the rear end of the inner expansion chuck 3. Specifically, the inner diameter of the portion of the coil spring structure outside each movable petal 31 is larger than the outer diameter of each movable petal 31 of the inner expansion chuck 3 after expansion, and the coil spring structure can still slide after each movable petal 31 expands. In other embodiments, the outer top spring member 4 can also be covered with a sleeve on the outside to form an elastic sleeve structure coaxially arranged with the main shaft, and the front end of the elastic sleeve is provided with a top ring supported by the outer top spring member 4, which contacts the end of the workpiece 9 through the top ring, thereby avoiding direct contact between the outer top spring member 4 and the workpiece 9, and avoiding the workpiece 9 from being squeezed and scratched by the outer top spring member 4, thereby effectively protecting the end surface of the workpiece 9.

[0056] like Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 and Figure 7 As shown, the inner expansion push rod 7 extends to the front end of the inner expansion chuck 3, the front end of the inner expansion chuck 3 is provided with a first conical cavity 32, and the rear end is provided with a second conical cavity 33, the front end of the inner expansion push rod 7 is provided with a first conical platform 71 adapted to the first conical cavity 32, and the rear end is provided with a second conical platform 72 adapted to the second conical cavity 33, so that the front and rear ends of each movable petal 31 of the inner expansion chuck 3 are supported simultaneously, improving the front and rear consistency of the opening of each movable petal 31, suitable for supporting and positioning of a workpiece 9 with a large length, and improving firmness and positioning accuracy. The inner expansion push rod 7 passes through the entire depth of the entire inner expansion chuck 3, and the inner expansion chuck 3 is synchronously supported by multiple supporting points of the inner expansion push rod 7, which improves the overall rigidity of the inner expansion chuck 3, firmly supports the workpiece 9, and accurately positions it, which is suitable for the overall inner expansion support and positioning of a workpiece 9 with a large length, and ensures the processing precision and quality.

[0057] like Figure 4 , Figure 7 and Figure 8 As shown, in some preferred embodiments, the outer push spring member 4 includes a large diameter portion 41 and a small diameter portion 42 connected front and back, the large diameter portion 41 is clearance-matched with each movable petal 31 of the inner expansion chuck 3, and the small diameter portion 42 is elastically supported and connected with the rear end of the outer expansion chuck. At this time, the small diameter portion 42 is similar to an elastic ring structure. When the movable petals 31 of the outer expansion chuck expand outward, the small diameter portion 42 expands to an expanded diameter state. When the inner expansion rod 7 loses support for each movable petal 31, the small diameter portion 42 generates an elastic contraction force on each movable petal 31, driving the inner expansion chuck 3 to quickly and completely contract, which helps the workpiece The inner expansion chuck 3 is provided with a small diameter portion 42, which drives the inner expansion chuck to quickly move inwards and contract, and the large diameter portion 41 is provided with a large diameter portion 41, which pushes the workpiece 9 outwards after the inner expansion chuck moves inwards and contracts. The combination of the two allows the workpiece to quickly move out of the inner expansion chuck after processing is completed, thereby increasing the unloading speed of the workpiece and preventing the movable petals of the inner expansion chuck 3 from being unable to quickly and completely move together and contract after losing the support of the inner expansion ejector rod 7, thereby causing the workpiece 9 to be unable to fall off quickly. This effectively improves the production efficiency of batch-produced workpieces.

[0058] like Figure 2 As shown, the pneumatic mechanism includes a cylinder body 11 and a plunger body 5, the cylinder body 11 is arranged in the main shaft 1, and the plunger body 5 is movably arranged in the cylinder body 11. The plunger rod at the front end of the plunger body 5 is extended from the connecting seat 2 and connected to the inner expansion rod 7. The plunger body 5 drives the inner expansion rod 7 to move forward, driving the movable petals 31 of the inner expansion chuck 3 to expand outward; the plunger body 5 drives the inner expansion rod 7 to move backward, and the movable petals 31 of the inner expansion chuck 3 lose the support of the inner expansion rod 7 and elastically shrink. It has a simple structure and is easy to control, and is suitable for installation on the main shaft 1 of a CNC core-moving machine.

[0059] like Figure 3 and Figure 6 As shown, the rear end of each conical cavity is connected to a cylindrical cavity whose outer diameter is larger than the outer diameter of the large end of the cone, and the stroke of the inner expansion rod 7 is limited by the length of the cylindrical cavity; the cylinder body 11 is provided with a stroke retaining ring 12, and the stroke of the plunger body 5 is limited by the stroke retaining ring 12, and the stroke of the inner expansion rod 7 is not less than the stroke of the plunger body 5, so that the plunger body 7 can drive the inner expansion rod 7 to move within the entire stroke, and the complete reciprocating motion of the inner expansion rod 7 is realized through the plunger body 7, and the radial expansion chuck 3 is extended and contracted within the set range to tighten the inner diameter of the workpiece.

[0060] like Figure 2As shown, the plunger rod is sheathed with a return spring member 6. During processing, the plunger body 5 moves forward and compresses the return spring member 6. When the processing is completed, the return spring member 6 in the compressed state drives the plunger body 5 to retreat. The return spring member 6 is used to realize the retreat and reset of the plunger body, so that only a power air source needs to be provided to push the plunger body forward, which reduces the structural complexity of the power air source connection, facilitates the spatial arrangement in the spindle 1, and simplifies the control process.

[0061] The front end of the spindle 1 is connected to the connecting seat 2 via a connecting tube 8, and the connecting tube 8 is provided with a sealing member 21 that cooperates with the plunger rod seal. The front end of the reset spring member 6 extends into the connecting tube 8, and the rear end abuts against the plunger body 5. The connecting tube 8 is connected to the front end of the spindle 1 to form a rod cavity of the pneumatic mechanism, and the setting of the connecting tube can accommodate the front end of the reset spring member 6, which plays an axial support role for the reset spring member 6, effectively reducing the difficulty of machining the cylinder cavity in the spindle and reducing the machining difficulty of the CNC core-moving machine.

[0062] The pneumatic mechanism is connected to a power air source, which is connected to the rodless chamber and the rod chamber of the cylinder body 11 through a reversing valve, and is configured to control the movement of the internal expansion chuck 3 through the reversing of the reversing valve: during the processing of the workpiece 9, the power air source is connected to the rodless chamber to drive the plunger body 5 forward, and each movable petal 31 expands to position the workpiece 9; when the workpiece 9 is processed, the power air source is connected to the rod chamber to drive the plunger body 5 backward, and each movable petal 31 elastically contracts to increase the contraction speed of the internal expansion chuck 3. It should be noted that the power air source can be an air source shared with a CNC core-moving machine, which drives the synchronous opening and closing of each movable petal 31 through the control of the reversing valve, and the control of the annular valve also adopts the control system of the CNC core-moving machine to achieve an integrated setting, which is convenient for the operation of the production process of the workpiece 9. The provided internal expansion chuck is installed at the front end of the spindle and is driven by a pneumatic mechanism arranged in the spindle. It matches the spindle structure and the working process of the external top spring member does not require external power drive. It is suitable for use in CNC core-moving machines, especially for supporting and positioning small-sized workpieces such as metal belts.

[0063] like Fig. 9 , Fig.10 and Fig.11As shown, in another preferred embodiment of the present invention, at least one third conical cavity 34 is provided in the middle of the inner expansion chuck 3, and a third conical platform 73 adapted to each of the third conical cavities 34 is provided in the middle part of the inner expansion ejector rod 7, so that the front and rear ends and the middle parts of each movable petal 31 of the inner expansion chuck 3 are synchronously supported, and the overall rigidity of each movable petal 31 after opening is improved, so as to realize the support and positioning of the front and rear ends and the middle parts of the workpiece 9 with a longer length, and improve the firmness and positioning accuracy. The inner expansion chuck of the provided auxiliary ejection device is synchronously supported by multiple supporting points of the inner expansion ejector rod, and the inner expansion chuck is synchronously supported by multiple supporting points of the inner expansion ejector rod, and the force on each supporting point is also reduced, so that the force is evenly distributed, the effective period of the support contact surface is improved, and the problem of damage to the support contact surface due to excessive pressure is avoided, which is particularly suitable for the case where the internal expansion force is large.

[0064] In addition, the inner expansion push rod passes through the entire depth of the inner expansion chuck, which is suitable for the overall inner expansion support and positioning of workpieces with a longer length, and the inner expansion chuck is synchronously supported by multiple support points of the inner expansion push rod. The through-type setting of the inner expansion push rod 7 plays the role of central support when clamping the workpiece 9, and is combined with the surrounding movable petals to form an integrated structure.

[0065] Compared with the structure in which the inner expansion ejector rod only supports the rear end of the movable petal of the movable chuck, the inner expansion ejector rod 7 provided by the present invention runs through the entire length of the inner expansion chuck 3, thereby improving the overall rigidity of the inner expansion chuck 3 and establishing a firm support for the workpiece 9, which is particularly suitable for the overall inner expansion support and positioning of the workpiece 9 with a longer length. Based on the above embodiments, the CNC core machine auxiliary ejector device for metal belt production provided by the present invention drives the inner expansion ejector rod 7 to move forward through the driving mechanism during the process in which the workpiece 9 is clamped and positioned by the inner expansion chuck 3, and drives the synchronous expansion of the movable petals 31 of the inner expansion chuck 3, so as to support the inner hole of the small-sized workpiece 9 such as the metal belt, quickly clamp and position it, and the outer ejector spring member 4 movably mounted on the outside of the inner expansion chuck 3 is compressed to a contracted state, which is convenient for the rapid progress of the subsequent processing process.

[0066] When the processing is completed, the internal expansion chuck 3 shrinks and no longer supports the inner hole of the workpiece 9. The workpiece 9 is pushed out of the internal expansion chuck 3 by the external push spring member 4. There is no need for workers to remove it manually, and no external power drive is required. The overall structure is simple and easy to operate, and it is suitable for the production process of mass production of workpieces.

[0067] So far, various embodiments of the present disclosure have been described in detail. In order to avoid obscuring the concept of the present disclosure, some details known in the art are not described. Based on the above description, those skilled in the art can fully understand how to implement the technical solution disclosed here.

[0068] Although some specific embodiments of the present disclosure have been described in detail by way of examples, it should be understood by those skilled in the art that the above examples are for illustration only and are not intended to limit the scope of the present disclosure. It should be understood by those skilled in the art that the above embodiments may be modified or some technical features may be replaced by equivalents without departing from the scope and spirit of the present disclosure. The scope of the present disclosure is defined by the appended claims.

Claims

1. An auxiliary ejection device of a CNC core-moving machine for metal belt production, characterized in that: It comprises a pneumatic internal expansion fixture and a pneumatic mechanism arranged at the front end of a main shaft (1) of a CNC core-moving machine; The pneumatic internal expansion clamp comprises a connecting seat (2), an internal expansion clamp (3), an internal expansion ejector rod (7) and an external ejector spring member (4); The connecting seat (2) is connected to the front end of the main shaft (1) and is coaxially arranged; The inner expansion chuck (3) is connected to the front end of the connection seat (2), and comprises a plurality of movable petals (31) arranged in a circumferential direction, and the inner expansion ejector rod (7) is movably arranged at the center of the plurality of movable petals (31); The outer top spring member (4) is movably mounted outside the inner expansion chuck (3); The pneumatic mechanism is drivably connected to the inner expansion ejector rod (7) and is configured to: during the machining process, drive the inner expansion ejector rod (7) to move forward, so that the movable petals (31) of the inner expansion chuck (3) expand outward to position the workpiece (9), and the outer push spring member (4) is pushed to a compressed state by the workpiece (9); after the machining is completed, drive the inner expansion ejector rod (7) to move backward, so that the movable petals (31) of the inner expansion chuck (3) elastically contract, and the outer push spring member (4) pushes the workpiece (9) away from the inner expansion chuck (3).

2. The auxiliary ejection device of the CNC core-moving machine for metal strip production according to claim 1 is characterized in that: The inner expansion rod (7) extends to the front end of the inner expansion chuck (3); the front end of the inner expansion chuck (3) is provided with a first conical cavity (32), and the rear end is provided with a second conical cavity (33); the front end of the inner expansion rod (7) is provided with a first conical platform (71) adapted to the first conical cavity (32), and the rear end is provided with a second conical platform (72) adapted to the second conical cavity (33), so that the front and rear ends of each movable petal (31) of the inner expansion chuck (3) are supported simultaneously, thereby improving the front and rear consistency of the opening of each movable petal (31).

3. The auxiliary ejection device of the CNC core-moving machine for metal strip production according to claim 1 is characterized in that: At least one third conical cavity (34) is arranged in the middle of the inner expansion chuck (3), and a third conical platform (73) adapted to each of the third conical cavities (34) is arranged in the middle portion of the inner expansion push rod (7), so that the front and rear ends and the middle portion of each movable petal (31) of the inner expansion chuck (3) are synchronously supported, thereby improving the overall rigidity of each movable petal (31) after opening.

4. The auxiliary ejection device of the CNC core-moving machine for metal strip production according to claim 1 is characterized in that: The outer top spring member (4) is a spiral spring structure, the front end of the outer top spring member (4) is movably mounted outside each movable petal (31) of the inner expansion chuck (3), and the rear end is fixedly mounted on the rear end of the inner expansion chuck (3).

5. The auxiliary ejection device of the CNC core-moving machine for metal strip production according to claim 1 is characterized in that: The outer push spring member (4) comprises a large diameter portion (41) and a small diameter portion (42) connected front and rear, the large diameter portion (41) being clearance-matched with each movable petal (31) of the inner expansion chuck (3), and the small diameter portion (42) being elastically supported and connected with the rear end of the outer expansion chuck. When each movable petal (31) of the outer expansion chuck expands outward, the small diameter portion (42) expands to an expanded diameter state. When the inner expansion push rod (7) loses support for each movable petal (31), the small diameter portion (42) generates an elastic contraction force on each movable petal (31), thereby driving the inner expansion chuck (3) to quickly and completely contract.

6. The auxiliary ejection device of a CNC core-moving machine for metal strip production according to claim 1, characterized in that: The pneumatic mechanism comprises a cylinder body (11) and a plunger body (5); the cylinder body (11) is arranged in the main shaft (1); the plunger body (5) is movably arranged in the cylinder body (11); a plunger rod at the front end of the plunger body (5) extends from a connecting seat (2) and is connected to the inner expansion rod (7); the plunger body (5) drives the inner expansion rod (7) to move forward, driving the movable petals (31) of the inner expansion chuck (3) to expand outward; the plunger body (5) drives the inner expansion rod (7) to move backward, and the movable petals (31) of the inner expansion chuck (3) lose the support of the inner expansion rod (7) and elastically shrink.

7. The auxiliary ejection device of a CNC core-moving machine for metal strip production according to claim 1 is characterized in that: The rear end of each conical cavity is connected to a cylindrical cavity whose outer diameter is larger than the outer diameter of the large end of the conical table, and the stroke of the inner expansion rod (7) is limited by the length of the cylindrical cavity; the cylinder body (11) is provided with a stroke retaining ring (12), and the stroke of the plunger body (5) is limited by the stroke retaining ring (12), and the stroke of the inner expansion rod (7) is not less than the stroke of the plunger body (5).

8. The auxiliary ejection device of a CNC core-moving machine for metal strip production according to claim 1, characterized in that: The plunger rod is sheathed with a return spring component (6). During processing, the plunger body (5) moves forward to compress the return spring component (6). When the processing is completed, the return spring component (6) in the compressed state drives the plunger body (5) to move backward.

9. The auxiliary ejection device of a CNC core-moving machine for metal strip production according to claim 1, characterized in that: The front end of the main shaft (1) is connected to the connecting seat (2) via a connecting tube (8), and the connecting tube (8) is provided with a sealing member (21) that cooperates with the plunger rod in a sealing manner. The front end of the return spring member (6) extends into the connecting tube (8), and the rear end abuts against the plunger body (5).

10. The auxiliary ejection device of a CNC core-moving machine for metal strip production according to claim 1, characterized in that: The pneumatic mechanism is connected to a power air source, which is connected to the rodless chamber and the rod chamber of the cylinder body (11) through a reversing valve, and is configured to control the movement of the internal expansion chuck (3) through the reversing of the reversing valve: during the processing of the workpiece (9), the power air source is connected to the rodless chamber to drive the plunger body (5) to move forward, and each movable petal (31) expands to position the workpiece (9); when the processing of the workpiece (9) is completed, the power air source is connected to the rod chamber to drive the plunger body (5) to move backward, and each movable petal (31) elastically contracts.

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