A multi-station displacement drive mechanism for a cold heading motorized die frame

Abstract

The present invention relates to a multi-station displacement drive mechanism for a cold heading movable die frame, comprising a crank rocker mechanism, a cam plate, a connecting rod and a movable die frame; the cam plate is provided with a cam groove opened in the horizontal direction, the cam groove is a multi-stage stepped groove that is staggered and continuous in the vertical direction, the lower end of the connecting rod is mounted in the cam groove via a roller, the upper end of the connecting rod is provided with a horizontal guide mechanism, the lower end of the movable die frame is movably mounted in the horizontal guide mechanism, the reciprocating motion of the cam plate in the horizontal direction drives the connecting rod to perform a reciprocating motion along the cam groove, thereby driving the movable die frame to perform intermittent reciprocating motion in the vertical direction, thereby realizing precise control of the multi-station intermittent displacement of the movable die frame in the vertical direction, thereby meeting the multi-station motion requirements of the new contact forming process.

Description

Technical Field

[0001] The invention relates to the field of cold heading forming equipment or heading machine equipment, in particular to a multi-station displacement driving mechanism of a cold heading motorized die frame. Background Art

[0002] The processing of double compound contacts used in existing relays is usually achieved by a general cold heading machine. The dynamic die frame drive mechanism of the existing general cold heading machine is as follows: Figure 1 As shown, its action process is: the driving cam 101 rotates around the fulcrum O' under the action of other transmission mechanisms. When the driving cam 101 enters the large diameter part from the small diameter part of its cam profile, the driving cam 101 pushes the roller of the forward roller block 105 and compresses the downward displacement error absorbing spring 106, so that the guide rod 102 presses against the grooved rocker guide block 107 along the guide direction of the fulcrum grooved rocker block 104, thereby pushing the rocker 109 to swing downward around the fulcrum A', and the driven rocker 111 swings downward, thereby causing the grooved connecting rod 110 to move downward, and the grooved connecting rod 110 drives the movable mold frame 20 to move downward along the main slider guide groove 113 in the main slider 112. When the fixed When the downward limit bolt 201 on the movable die frame 20 hits the main slider 112, the first die 22 fixed on the movable die frame 20 is aligned with the fixed die reference position 21, and the movable die frame 20 completes the downward displacement action; but due to the motion trajectory characteristics of the four-bar linkage composed of the rocker 109, the grooved connecting rod 110, the driven rocker 111 and the machine bed and the actual processing accuracy of the parts, when the driving cam 101 rotates to the large diameter part of the cam profile, the guide rod 102 will continue to push forward, and the connecting rod 110 and the rocker 109 must maintain their positions unchanged under the action of the downward limit bolt 201, the downward displacement error absorbing spring 106 is compressed, and the movable die group of the equipment enters a stationary state of a mold forming station (such as Figure 2-1 As shown), at this time, the main slider guide groove 113 and the guide part of the movable mold frame 20, the guide part of the main slider 112 and the bed guide mechanism 114, due to the pressure exerted by the lower displacement error absorbing spring 106 on the lower displacement limit bolt 201 and the main slider 112 through the mechanism, the lateral force of the guide mechanism will affect the molding accuracy, and it is also easy to cause premature wear and affect the contact molding stability.

[0003] After the first mold forming is completed, the driving cam 101 continues to rotate around the fulcrum O'. When the driving cam 101 enters the small diameter part from the large diameter part of its cam profile, the driving cam 101 pushes the retraction roller 103 to make the guide rod 102 retract to the right along the guide direction of the fulcrum slot swing block 104. The guide rod 102 pushes the slot swing rod guide block 107 at the fulcrum B1 of the swing rod 109 through the upper displacement error absorbing spring 108, so that the swing rod 109 swings upward around the fulcrum A', and the driven swing rod 111 swings upward, thereby making the slotted connecting rod 110 move upward. The slotted connecting rod 110 drives the movable mold frame 20 to move upward along the main slider guide groove 113 in the main slider 112. When the upward limit bolt 202 fixed on the main slider 112 hits the upper end surface of the movable mold frame 20, the second mold 23 fixed on the movable mold frame 20 is aligned with the fixed mold reference position 21, and the movable mold frame 20 completes the upward displacement action. When the driving cam 101 rotates to the small diameter part of the cam profile, the guide rod 102 will continue to retract. At this time, the connecting rod 110 and the rocker arm 109 must maintain their positions under the action of the upper limit bolt 202. The upper shift error absorbing spring 108 is compressed. At this time, the movable mold group of the equipment enters the static state of the second mold forming station (such as Figure 2-2 As shown in the figure, at this time, the main slider guide groove 113 and the guide part of the movable mold frame 20, the guide part of the main slider 112 and the bed guide mechanism 114, due to the pressure exerted by the upper displacement error absorbing spring 108 on the upper displacement limit bolt 202 and the movable mold frame 20 through the mechanism, make the guide mechanism be subjected to lateral force, which will affect the molding accuracy, and also easily cause premature wear, affecting the contact molding stability.

[0004] The existing general cold forging dynamic die frame drive mechanism can only achieve the precise limit static state of the upper and lower stations to meet the action requirements of contact cold forging forming, and cannot achieve the new contact forming process action requirements of three or more multi-station intermittent movement of the dynamic die frame. As the double composite contacts used in relays have increasingly higher requirements for the distribution of the silver layer, the traditional two-station forging process can no longer meet the forging requirements of these contacts, so it is necessary to develop a multi-station contact continuous forging equipment. Summary of the Invention

[0005] The present invention aims to provide a multi-station displacement drive mechanism for a cold heading movable die frame, which can realize precise control of the multi-station intermittent displacement of the movable die frame in the vertical direction, thereby realizing the multi-station action requirements of the new contact forming process.

[0006] The specific plan is as follows:

[0007] A multi-station displacement drive mechanism for a cold heading movable die frame comprises a crank rocker mechanism, a cam plate, a connecting rod and a movable die frame; the crank rocker mechanism is drivingly connected to the cam plate and can push the cam plate to move back and forth in the horizontal direction; the cam plate has a cam groove opened in the horizontal direction, and the cam groove is a multi-stage stepped groove that is staggered and continuous in the vertical direction; the lower end of the connecting rod is installed in the cam groove through a roller; the upper end of the connecting rod is provided with a horizontal guide mechanism; the lower end of the movable die frame is connected to the horizontal guide mechanism at the upper end of the connecting rod; the reciprocating movement of the cam plate in the horizontal direction drives the connecting rod to move back and forth along the cam groove, thereby driving the movable die frame to perform intermittent reciprocating movement in the vertical direction.

[0008] Furthermore, the height difference between two adjacent step sections of the cam groove from the lowest point to the highest point is defined as H1 to Hn respectively, and the movable mold frame is provided with molds 1 to N in sequence from bottom to top in the vertical direction, and the distance between the center lines of two adjacent molds from bottom to top is H1 to Hn in sequence.

[0009] Furthermore, the displacement stroke of the movable mold frame in the horizontal direction is defined as L, the limit position stroke of the movable mold frame in the horizontal guide mechanism is E1E2, and E1E2>L.

[0010] Furthermore, a first roller is installed at the lower end of the connecting rod, and the first roller is movably installed in the cam groove of the cam plate. The first roller can slide in the cam groove as the cam plate reciprocates in the horizontal direction.

[0011] Furthermore, the horizontal guide mechanism is a linear guide pair, which includes a linear guide rail and a slider. The lower end of the movable mold frame is connected to the slider to allow the movable mold frame to move along the linear guide rail.

[0012] Furthermore, the crank rocker mechanism includes a driving crank and a slotted rocker fixed to the machine tool bed, one end of the driving crank is hinged to the machine tool bed to form a first fulcrum, so that the driving crank can rotate around the first fulcrum under the action of an external transmission mechanism; one end of the slotted rocker is hinged to the machine tool bed to form a second fulcrum, and the slotted rocker has a first groove and a second groove extending along its length direction, and a first groove guide block and a second groove guide block are respectively provided in the first and second grooves, and the first and second groove guide blocks can slide in their respective first and second grooves along the length direction of the slotted rocker; the other end of the driving crank is hinged to the first groove guide block to form a third fulcrum, and the driving crank drives the first groove guide block through the third fulcrum to push the slotted rocker to perform a reciprocating swinging motion around the second fulcrum, thereby pushing the cam plate driven by the second groove guide block to perform horizontal reciprocating motion.

[0013] Furthermore, the cam plate is movably assembled on a first guide mechanism of the machine tool bed. The first guide mechanism guides the horizontal movement of the cam plate. The first guide mechanism is a linear guide pair.

[0014] Furthermore, the connecting rod is movably assembled on a second guide mechanism of the machine tool bed, and the second guide mechanism guides the vertical movement of the connecting rod. The second guide mechanism is a linear guide pair.

[0015] Furthermore, it also includes a main slider, which has a main slider guide mechanism arranged in the vertical direction. The movable mold frame can perform vertical movements along the main slider guide mechanism, and the movable mold frame moves synchronously with the main slider in the horizontal direction. The main slider guide mechanism is a linear guide pair.

[0016] Furthermore, the main slide is movably assembled on a bed guide mechanism of the machine tool bed, and the bed guide mechanism guides the horizontal movement of the movable mold frame, and the bed guide mechanism is a linear guide pair.

[0017] The multi-station displacement drive mechanism for a cold heading movable die frame provided by the present invention has the following advantages compared with the prior art: the multi-station displacement drive mechanism for a cold heading movable die frame provided by the present invention adopts a crank to drive a grooved rocker arm to swing back and forth, thereby driving the cam plate to move back and forth in a horizontal position, and then the cam groove on the cam plate drives the movable die frame to move back and forth in the vertical direction. By designing the horizontal profile of the multi-layer stepped groove of the cam groove, precise control of the multi-station intermittent displacement of the movable die frame in the vertical direction is achieved, thereby realizing the multi-station intermittent displacement action requirements of the new molding process. Since the movable mold frame has no extra force on the non-closing direction of the main slider during the entire movement process, and the movable mold frame moves smoothly in the up and down directions without impacting the transmission mechanism, it effectively avoids the dimensional instability and frequent equipment adjustment caused by the impact deformation of the limit elements in general cold heading. When the mold is closed and formed in each process, the movable mold frame is stationary in the vertical direction and guided by the guide mechanism at the upper end of the connecting rod in the horizontal direction, following the main slider to perform the mold closing action. The movable mold frame has higher accuracy and stability in the upper and lower positioning, and there is no obvious noise during operation. The drive mechanism has the advantage of simple structure, while also avoiding the influence of the deformation of the rigid limit elements of general equipment, and has better stability and easy maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 A schematic diagram of a conventional cold heading motorized die frame drive mechanism is shown.

[0019] Figure 2-1 to Figure 2-2 The figure shows the driving process of the existing cold heading machine die frame, wherein: Figure 2-1 It is a schematic diagram of the bottom dead point position of the movable mold frame. Figure 2-2 It is a schematic diagram of the upper dead point position of the movable mold frame.

[0020] Figure 3 A schematic diagram of the multi-station displacement drive mechanism of the cold heading motorized die frame provided by the present invention is shown.

[0021] Figure 4 A schematic diagram of control parameters of the multi-station displacement drive mechanism of the cold heading motorized die frame provided by the present invention is shown.

[0022] Figure 5-1 to Figure 5-6 The figure shows the operation process of the multi-station displacement drive mechanism of the cold heading motorized die frame provided by the present invention, wherein: Figure 5-1 This is a schematic diagram of the movable mold frame in the Z-axis stationary state at the first working position before rising; Figure 5-2 This is a schematic diagram of the movable mold frame in the Z-axis stationary state at the second workstation while continuing to rise; Figure 5-3 This is a schematic diagram of the movable mold frame rising to the third station in the Z-axis stationary state; Figure 5-4 This is a schematic diagram of the movable mold frame in the Z-axis static state at the third workstation before it descends; Figure 5-5 This is a schematic diagram of the movable mold frame being in a Z-axis stationary state at the second workstation while continuing to descend; Figure 5-6 This is a schematic diagram of the movable mold frame descending to the first stationary state in the Z direction. DETAILED DESCRIPTION

[0023] To further illustrate various embodiments, the present invention is provided with accompanying drawings. These drawings form part of the present disclosure and are primarily used to illustrate the embodiments and, in conjunction with the relevant description in the specification, to explain the operating principles of the embodiments. By referring to these drawings, one of ordinary skill in the art will understand other possible embodiments and the advantages of the present invention. The components in the figures are not drawn to scale, and similar reference numerals are generally used to represent similar components.

[0024] The present invention will now be further described with reference to the accompanying drawings and specific embodiments.

[0025] like Figure 3 As shown, this embodiment provides a multi-station displacement drive mechanism for a cold heading movable die frame, including a crank rocker mechanism, a cam plate, a connecting rod and a movable die frame.

[0026] The crank-rocker mechanism consists of a driving crank 31 and a slotted rocker 32 fixed to the machine tool bed. One end of the driving crank 31 is hinged to the machine tool bed, forming a first fulcrum O. This allows the driving crank 31 to rotate clockwise around the first fulcrum O at a constant speed under the action of other transmission mechanisms. One end of the slotted rocker 32 is hinged to the machine tool bed, forming a second fulcrum A. The slotted rocker 32 has a first slot and a second slot extending along its length. A first slot guide block 33 and a second slot guide block 34 are respectively disposed within the first and second slots. The first and second slot guide blocks can slide within their respective first and second slots along the length of the slotted rocker 32.

[0027] The other end of the driving crank 31 is hinged to the first groove guide block 33 to form a third fulcrum B. The driving crank 31 drives the first groove guide block 33 on the grooved rocker 32 through the third fulcrum B to push the grooved rocker 32 to swing back and forth around the second fulcrum A on the machine bed. At the same time, the second groove guide block 34 on the grooved rocker 32 drives the cam plate 4 to perform horizontal reciprocating motion.

[0028] The cam plate 4 is movably mounted within a first guide mechanism 41, which is arranged horizontally on the machine bed and matches the cam plate 4. This allows the cam plate 4 to reciprocate horizontally within the first guide mechanism 41. The side of the cam plate 4 facing the second slotted guide block 34 is drive-connected to the second slotted guide block 34, forming a fourth fulcrum C. When the crank 31 drives the first slotted guide block 33 on the slotted rocker 32 via the third fulcrum B, the slotted rocker 32 is pushed back and forth about the second fulcrum A on the machine bed. Simultaneously, the second slotted guide block 34 drives the cam plate 4 to reciprocate horizontally. The first guide mechanism 41 can be a guide slot matching the cam plate 4, or it can be a linear guide pair, wherein the linear guide pair includes a linear guide rail and a slider mounted on the linear guide rail, which can move along the linear guide rail. In this embodiment, the first guide mechanism 41 is preferably a linear guide pair, and the cam plate 4 is fixedly mounted on the slider of the linear guide pair, allowing the cam plate 4 to slide along the linear guide rail.

[0029] The cam plate 4 has a cam groove 40 extending in the horizontal direction. The cam groove 40 is a multi-stage stepped groove that is staggered and continuous in the up and down directions. The number of stages of the stepped groove corresponds to the number of workstations and can be determined according to actual needs. This embodiment is described with three workstations as an example, so the cam groove 40 is also a three-stage stepped groove.

[0030] The connecting rod 5 is movably mounted within a second guide mechanism 53, which is arranged vertically on the machine tool bed and matches the connecting rod 5. Its lower end is movably mounted within the cam groove 40 of the cam plate 4 via a first roller 51. The first roller 51 can slide within the cam groove 40 as the cam plate 4 moves horizontally back and forth, thereby driving the connecting rod 5 to intermittently move up and down within the second guide mechanism 53. The second guide mechanism 53 can also be a guide groove matching the connecting rod 5, or a linear guide pair. In this embodiment, the second guide mechanism 53 is preferably a linear guide pair, and the connecting rod 5 is fixedly mounted on the slider of the linear guide pair to enable the connecting rod 5 to slide along the linear guide.

[0031] A horizontal guide mechanism 54 is provided at the upper end of the connecting rod 5. The movable mold frame 20 is movably mounted in the main slide guide groove 113 of the main slide 112. The horizontal guide mechanism can be a horizontally arranged slide or a horizontally mounted linear guide. In the exemplary diagram of this embodiment, the horizontal guide mechanism 54 is a slide, and the lower end of the movable mold frame 20 is mounted in the slide via a second roller 52. However, the horizontal guide mechanism 54 can also be a linear guide, with the lower end of the movable mold frame 20 connected to the slide of the linear guide. The intermittent up-and-down reciprocating motion of the connecting rod 5 within the second guide mechanism 53 propels the movable die frame 20 to intermittently reciprocate up and down along the main slider guide groove 113 of the main slider 112. The main slider 112 is movably mounted on a bed guide mechanism 114 of the machine tool bed. The bed guide mechanism 114 guides the horizontal motion of the main slider 112. The motion direction of the horizontal guide mechanism 54 is parallel to the horizontal reciprocating direction of the main slider 112. Therefore, when the movable die frame 20 intermittently moves in the vertical direction, its displacement time and vertical displacement are determined solely by the cam groove 40 on the cam plate 4 and are not affected by the horizontal displacement of the main slider 112. It should be noted that the movable die frame 20 and the main slider 112 are substantially identical to those of the prior art. Therefore, their specific structures are not described in detail here. Only their operating principles are described, and the reference numbers of the same components in the background art are also used here. In addition, the movable mold frame 20 is provided with a plurality of mold groups corresponding to the number of workstations. For example, in this embodiment, the mechanism has three workstations, and thus the movable mold frame 20 is provided with a first mold 22, a second mold 23, and a third mold 24. The guide mechanism in this embodiment can be any guide mechanism known in the art, such as a guide groove, a linear guide rail, etc.

[0032] The key points of controlling the multi-station displacement drive mechanism of the cold heading motorized die frame provided in this embodiment are as follows: Figure 4As shown, the driving crank 31 rotates clockwise around the fixed point O, and the motion trajectory of the crank OB is tangent to the slotted rocker 32 at points B1 and B2. When the driving crank OB rotates clockwise in the angle ∠B1OB2 range, the angle ∠B1OB2 is α, the slotted rocker 32 is in a quick return state, and the cam plate 4 retracts rapidly from C1 to C2. The maximum stroke of the cam plate 4 is S, and the time occupied is α / 360×T, where T is the upsetting cycle time of one contact. The movable mold frame 20 rapidly returns from the state where the third mold 24 is aligned with the fixed mold reference position 21 to the state where the first mold 22 is aligned with the fixed mold reference position 21, with a travel of H2 + H1. When the swing arm OB rotates clockwise within the angle ∠B2OB1 range, the slotted rocker 32 slowly advances from C2 to C1. At this time, the center point D of the first roller on the connecting rod 5 shifts within the cam groove of the cam plate 4 from the horizontal position D3 to the horizontal position D2, and then from the horizontal position D2 to the horizontal position D1, a distance of H2. If the horizontal displacement travel of the main slide 112 is L, then the corresponding extreme position E1E2 length of the groove 54 on the connecting rod 5 that engages the second roller 52 on the movable mold frame 20 should be greater than L. When the first roller 51 of the connecting rod 5 is in the starting and ending time periods of the climbing of each horizontal position, the main slider 112 should be in the middle position (start) of the displacement L, and then return to the middle position (end) of the displacement L from the mold opening limit position; when the first roller 51 of the connecting rod 5 is in the static time period at the beginning and end of each horizontal line, the main slider 112 should be in the time period corresponding to the middle position (start) of the displacement L, moving forward to close the mold, and then returning to the middle position (end) of the displacement L from the mold closing limit position; the above requirements are used to meet the multi-station cam profile of the cam plate 4. Through the above connection control method, the operation process of the multi-station intermittent drive mechanism of the cold heading dynamic mold frame provided in this embodiment is as follows: Figures 5-1 to 5-6 As shown:

[0033] When the crank 31 is driven to rotate around the fulcrum O from B2 to Figure 5-1 When the position is shown, the first groove guide block 33 pushes the grooved swing rod 32 to swing clockwise around the fulcrum A from the right extreme position AB2C2 to the left. Figure 5-1 In the position shown, the second groove guide block 34 in the grooved rocker 32 pushes the cam plate 4 to move horizontally to the left along the first guide mechanism 41 of the bed, and the first roller 51 of the connecting rod 5 rolls along the leftmost end D3 of the horizontal line of the cam groove 40 station of the cam plate 4 to the right end of the horizontal line, and the position of the connecting rod 5 remains unchanged. At this time, the main slider 112 drives the movable mold frame 20 to open the mold in the horizontal direction, and the second roller 52 on the movable mold frame 20 moves from the E1 position to the E2 direction along the slide groove 54 of the connecting rod 5. During this time period, the axis direction of the second mold 22 on the movable mold frame 20 is aligned with the fixed mold reference position 21 and remains unchanged until the second roller 52 reaches L / 2 and the first roller 51 of the connecting rod 5 reaches the rightmost end of the D3 horizontal line. At this time, the state is as follows: Figure 5-1 shown.

[0034] The driving crank 31 continues to rotate clockwise around the fulcrum O, driving the slotted rocker 32 to push the cam plate 4 to move horizontally to the left. The first roller 51 of the connecting rod 5 is guided by the first guide mechanism 41 on the bed and rises from the horizontal line D3 to the leftmost end of the horizontal line D2 along the cam groove 40 of the cam plate 4. The height of the first roller 51 is increased by H1, and the sliding groove 54 of the connecting rod 5 pushes the movable mold frame 20 so that the second mold 23 is aligned with the fixed mold reference position 21. At the same time, the main slide 112 drives the movable mold frame 20 to open the mold to the right to the rear dead center and then to the left to close the mold. When the first roller 51 is completed, The main slider 112 returns to the left at L / 2, and the movable mold frame 20 enters the relatively static state of the second station in the vertical direction. At this time, the driving crank 31 continues to drive the cam plate 4 to move left, and the main slider 112 drives the movable mold frame 20 to close the mold to the left to the front dead center and then to the right to open the mold until the first roller 51 of the connecting rod 5 reaches the right end of the D2 horizontal line. The main slider 112 brings the second roller 52 of the movable mold frame 20 back to the right at L / 2. During this period of time, the axis of the second mold 23 and the fixed mold reference 29 remain unchanged. Its state is as follows: Figure 5-2 shown.

[0035] The driving crank 31 continues to rotate clockwise around the fulcrum O, driving the slotted rocker 32 to push the cam plate 4 to move horizontally to the left. The first roller 51 of the connecting rod 5 is guided by the first guide mechanism 41 on the bed and rises from the horizontal line D2 to the leftmost end of the horizontal line D1 along the cam groove 40 of the cam plate 4. The first roller 51 is raised to a height of H2, and the sliding groove 54 of the connecting rod 5 pushes the movable mold frame 20 so that the third mold 24 is aligned with the fixed mold reference position 21. At the same time, the main slide 112 drives the movable mold frame 20 to open the mold to the right. The rear dead center moves to the left to close the mold. When the first roller 51 completes the slope climbing from D2 to the horizontal line D1, the main slide 112 returns to the left at L / 2, and the movable mold frame 20 enters the relative static state of the third station in the vertical direction until the driving crank 31 continues to rotate clockwise around the fulcrum O to the position OB1, and the grooved rocker 32 rotates clockwise around the fulcrum A to the left limit position AB1C1. The first roller 51 of the connecting rod 5 reaches the rightmost end of the horizontal line D1 of the cam profile in the cam plate 4. The state is as follows: Figure 5-3 shown.

[0036] When the driving crank 31 continues to rotate clockwise around the fulcrum O, the slotted rocker 32 starts to rotate counterclockwise around the fulcrum A from the left extreme position AB1C1, and the second slotted guide block 34 pulls the cam plate 4 to move horizontally to the right along the first guide mechanism 41 of the bed, and the first roller 51 of the connecting rod 5 returns from the rightmost end of the D1 horizontal line in the cam groove 40 of the cam plate 4 to the leftmost end of the D1 horizontal line. The state is as follows: Figure 5-4As shown in the figure, while the first roller 51 of the connecting rod 5 rolls along the horizontal line D1 of the cam groove 40, the main slider 112 moves the movable mold frame 20 to the left to close the mold to the front dead center and then to the right to open the mold. This movement continues until the first roller 51 of the connecting rod 5 reaches the left end of the horizontal line D1. The main slider 112 then moves the second roller 52 of the movable mold frame 20 back to the right at a position L / 2. During this period, the axis of the three molds 24 of the movable mold frame 20 remains unchanged relative to the fixed mold reference position 21.

[0037] When the driving crank 31 continues to rotate clockwise around the fulcrum O, the slotted rocker arm 32 is driven to pull the cam plate 4 to move horizontally to the right. The first roller 51 of the connecting rod 5 is guided by the first guide mechanism 41 on the bed and drops from the D1 horizontal line to the rightmost end of the D3 horizontal line along the cam groove 40 of the cam plate 4. The height of the first roller 51 drops (H1+H2), and the movable mold frame 20 is pulled back by the slot of the connecting rod 5, so that the second mold 22 is aligned with the fixed mold reference position 21 again. At the same time, the main slider 112 drives the movable mold frame 20 to open the mold to the right to the rear dead center and then to the left to close the mold. When the first roller 51 completes the retraction action from D1 to the D3 horizontal line, the main slider 112 returns to the left at L / 2, and the movable mold frame 20 enters the relative static state of the first station in the vertical direction. At this time, the state of the driving mechanism is as follows: Figure 5-6 shown.

[0038] When the movable mold frame 20 descends, the state of the first roller 51 of the connecting rod 5 passing through the horizontal line D2 is as follows: Figure 5-5 As shown, the driving crank 31 continues to rotate clockwise around the fulcrum O to the OB position, and the grooved rocker 32 rotates counterclockwise around the fulcrum A to the right extreme position AB2C2. In the process of the main slider 112 driving the movable mold frame 20 to continue to close the mold to the left, the first roller 51 of the connecting rod 5 reaches the leftmost end of the D1 horizontal line in the cam groove 40 of the cam plate 4, and the second mold 22 remains aligned with the fixed mold reference position 21. Therefore, the mechanism provided by this embodiment completes the intermittent displacement reciprocating action of the three-station movable mold frame in the vertical direction of one contact molding cycle.

[0039] The multi-station displacement drive mechanism for a cold heading movable die frame provided by the present invention utilizes a circular crank to drive a slotted rocker for reciprocating swing, thereby driving a cam plate to reciprocate horizontally. The cam grooves on the cam plate then drive the movable die frame to reciprocate vertically. By designing the multi-layer horizontal profile of the cam grooves, precise control of the movable die frame's intermittent displacement in the vertical direction is achieved, thereby meeting the multi-station intermittent displacement requirements of a new molding process. Since the movable die frame exerts no excess force on the main slider in the non-clamping direction throughout its movement, and moves smoothly in the vertical direction without impacting the transmission mechanism, the dimensional instability and frequent equipment adjustments caused by impact deformation of the limiter elements in conventional cold heading processes are effectively avoided. During the mold closing and forming process, the movable die frame remains stationary in the vertical direction and is guided horizontally by a guide mechanism at the upper end of the connecting rod, following the main slider in the mold closing motion. This achieves higher precision and stability in vertical positioning of the movable die frame, and is silent during operation. The drive mechanism has the advantage of a simple structure and avoids the deformation of the rigid limiter elements of conventional equipment, resulting in improved stability and ease of maintenance.

[0040] Although the present invention has been particularly shown and described in conjunction with preferred embodiments, it will be understood by those skilled in the art that various changes in form and details may be made to the present invention without departing from the spirit and scope of the invention as defined in the appended claims, and all such changes are within the scope of protection of the present invention.

Claims

1. A multi-station displacement drive mechanism for a cold heading motorized die frame, characterized by: The cam plate is connected to the cam plate and can push the cam plate to move back and forth in the horizontal direction, the cam plate has a cam groove opened in the horizontal direction, the cam groove is a multi-stage stepped groove of three or more sections that are staggered and continuous in the vertical direction, the lower end of the connecting rod is installed in the cam groove through a roller, the upper end of the connecting rod is provided with a horizontal guide mechanism, the lower end of the movable mold frame is connected to the horizontal guide mechanism at the upper end of the connecting rod, the reciprocating action of the cam plate in the horizontal direction drives the connecting rod to move back and forth along the cam groove, and then drives the movable mold frame to perform intermittent reciprocating motion in the vertical direction; the crank-rocker mechanism includes a driving crank and a slotted rocker fixed to the machine tool bed, one end of the driving crank is hinged to the machine tool bed and forms a first fulcrum, so that the driving crank can be moved back and forth under the action of an external transmission mechanism Able to rotate around a first fulcrum; one end of the grooved rocker arm is hinged to the machine tool bed to form a second fulcrum, the grooved rocker arm has a first groove and a second groove extending along its length direction, a first groove guide block and a second groove guide block are respectively provided in the first and second grooves, the first and second groove guide blocks can slide in their respective first and second grooves along the length direction of the grooved rocker arm; the other end of the driving crank is hinged to the first groove guide block to form a third fulcrum, the driving crank drives the first groove guide block through the third fulcrum to push the grooved rocker arm to perform a reciprocating swinging motion around the second fulcrum, thereby pushing the cam plate driven by the second groove guide block to perform horizontal reciprocating motion, the height difference between the two adjacent step sections of the cam groove from its lowest point to its highest point is defined as H1 to Hn, the movable mold frame is provided with one mold to N molds in sequence from bottom to top in the vertical direction, and the spacing between the center lines of the two adjacent molds from bottom to top is H1 to Hn.

2. The multi-station displacement drive mechanism for the cold heading motorized die frame according to claim 1, characterized in that: The displacement stroke of the movable mold frame in the horizontal direction is defined as L, the limit of the movable mold frame in the horizontal guide mechanism is located at a stroke of E1E2, and E1E2>L.

3. The multi-station displacement drive mechanism for cold heading motorized die sets according to claim 1, characterized in that: A roller is installed at the lower end of the connecting rod. The roller is movably installed in the cam groove of the cam plate. The roller can slide in the cam groove as the cam plate reciprocates in the horizontal direction.

4. The multi-station displacement drive mechanism for cold heading mobile die frame according to claim 1, characterized in that: The horizontal guide mechanism is a linear guide pair, which includes a linear guide rail and a slider. The lower end of the movable mold frame is connected to the slider so that the movable mold frame can move along the linear guide rail.

5. The multi-station displacement drive mechanism for cold heading mobile die frame according to claim 1, characterized in that: The cam plate is movably assembled on a first guide mechanism of the machine tool bed. The first guide mechanism guides the horizontal movement of the cam plate. The first guide mechanism is a linear guide pair.

6. The multi-station displacement drive mechanism for cold heading motorized die sets according to claim 1, characterized in that: The connecting rod is movably assembled on the second guide mechanism of the machine tool bed. The second guide mechanism guides the vertical movement of the connecting rod. The second guide mechanism is a linear guide pair.

7. The multi-station displacement drive mechanism for the cold heading motorized die set according to claim 1, characterized in that: It also includes a main slider, which has a main slider guide mechanism arranged in the vertical direction. The movable mold frame can perform vertical movements along the main slider guide mechanism, and the movable mold frame moves synchronously with the main slider in the horizontal direction. The main slider guide mechanism is a linear guide pair.

8. The multi-station displacement drive mechanism for the cold heading mobile die set according to claim 7, characterized in that: The main slide is movably assembled on a bed guide mechanism of the machine tool bed. The bed guide mechanism guides the horizontal movement of the movable die frame. The bed guide mechanism is a linear guide pair.

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