Continuous length extruder

Abstract

The application discloses a continuous lengthening extruding machine, which comprises a frame, a feeding mechanism, a forming die assembly, a feeding sliding table and a transmission mechanism arranged on the frame, the forming die assembly comprises a plurality of forming dies and forming die pressing heads, the forming die comprises a die holder, the die holder is provided with an installation cavity penetrating through front and back, at least two variable-diameter dies are arranged in the installation cavity, a liquid seepage gap is formed between the adjacent two variable-diameter dies, a cooling pipe which is communicated with the installation cavity is arranged on the die holder, and a cooling medium is introduced into the cooling pipe, the workpiece is directly cooled in the variable-diameter die, the cooling efficiency is high and uniform, and the cooling liquid consumption is small.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of machine tool equipment, and more particularly to a continuous lengthening and extruding machine. BACKGROUND

[0002] In mechanical processing, a circular metal shell needs to go through the processes of lengthening, extruding and flat bottoming before forming.

[0003] As a Chinese patent with publication number CN214639454U discloses a shell drawing forming integrated machine, which belongs to the technical field of metal shell processing, and comprises a feeding mechanism, a forming die assembly, a feeding sliding table, a indexing unloading mechanism and a transmission mechanism. The forming die assembly comprises a first forming die press head, a second forming die press head, a third forming die press head, a flat bottom die, an extruding die and a lengthening die. The first forming die press head, the second forming die press head and the third forming die press head correspond to the flat bottom die, the extruding die and the lengthening die respectively. The feeding structure feeds the material into the forming die assembly. The feeding sliding table moves one stroke. The feeding sliding table sequentially moves the material from the flat bottom die to the extruding die and the lengthening die. In each moving stroke, the forming die assembly is used for forming the material, and finally the material is unloaded through the indexing unloading mechanism.

[0004] Although the above-mentioned patent can realize the combination of flat bottoming and lengthening equipment, the workpiece needs to be cooled during lengthening. The traditional cooling method is to spray cooling liquid at the opening of the forming die (flat bottom die, extruding die and lengthening die). This not only requires a large amount of cooling liquid, but also the cooling liquid cannot enter the inside of the forming die when the forming die is blocked by the workpiece, resulting in poor cooling effect. SUMMARY

[0005] In view of the deficiencies of the prior art, the present application provides a method for directly cooling the workpiece inside the variable diameter die, which has high and uniform cooling efficiency and requires less cooling liquid.

[0006] To achieve the above-mentioned purpose, the present application provides the following technical scheme: a continuous lengthening and extruding machine, comprising a rack, a feeding mechanism, a forming die assembly, a feeding sliding table and a transmission mechanism arranged on the rack. The forming die assembly comprises a plurality of forming dies and forming die press heads. The forming die comprises a die seat, and a front-to-rear-through mounting cavity is arranged on the die seat. At least two variable diameter dies are arranged in the mounting cavity. A liquid seepage gap is formed between the adjacent two variable diameter dies. A cooling pipe is arranged on the die seat and communicates with the mounting cavity. Cooling medium is introduced into the cooling pipe.

[0007] Further, a distribution cavity is arranged in the die seat and corresponds to the communication between the cooling pipe and the mounting cavity. The distribution cavity communicates with all the liquid seepage gaps.

[0008] Further, a buffer cavity is arranged between the adjacent two variable diameter dies, and the buffer cavity communicates with the inside hole position of the variable diameter die.

[0009] Further, a guide die is arranged in the installation cavity.

[0010] Further, the cooling pipe is connected with a pressure pump.

[0011] Further, the feeding mechanism comprises a blind hole piece hook type feeding device, a conveying pipe and a delivery device, the delivery device comprises a discharging cylinder, a material receiving channel is arranged in the mold base and extends through the front and back of the mold base, the bottom end of the discharging cylinder is communicated with the material receiving channel, a spring pin is arranged at the bottom of the discharging cylinder, a pressing rod is arranged at the top end of the discharging cylinder, a pushing rod is arranged at the back of the mold base corresponding to the material receiving channel, the pushing rod is connected with a transmission mechanism, and the two ends of the conveying pipe are connected with the blind hole piece hook type feeding device and the delivery device respectively.

[0012] Further, a back flushing rod is arranged at the back of the mold base corresponding to the installation cavity, and the back flushing rod is connected with the transmission mechanism.

[0013] Further, the transmission mechanism comprises a fixed seat, a rotating shaft is rotatably connected with the fixed seat, a first swing arm is arranged on the rotating shaft, one end of the back flushing rod and the pushing rod extends to the fixed seat and abuts against the first swing arm, and a compression spring is arranged on the back flushing rod and the pushing rod, and the compression spring is used for moving the back flushing rod and the pushing rod backward.

[0014] Further, an anti-abrasion cap is arranged at the end of the back flushing rod and the pushing rod which faces the first swing arm, and a spherical top pin is arranged at the end of the first swing arm and abuts against the anti-abrasion cap.

[0015] Further, a second swing arm is arranged on the rotating shaft, a pull rod is connected with the second swing arm, and a swing rod is connected with the pull rod, the swing rod is rotatably connected with a rack, the pull rod comprises a first pull rod, a second pull rod and a threaded sleeve, the first pull rod is connected with the swing rod, the second pull rod is connected with the second swing arm, the threaded sleeve is threadedly connected with the first pull rod and the second pull rod, and the threaded sleeve is arranged with left and right threads.

[0016] Compared with the prior art, the present application has the following beneficial effects:

[0017] 1. High cooling efficiency, less cooling liquid and uniform temperature of the product during stretching;

[0018] 2. When the product is withdrawn from the mold base, the first swing arm, the pushing rod and the back flushing rod have small contact noise;

[0019] 3. The total length of the pull rod is adjustable, and thus the swing angle of the first swing arm and the second swing arm can be controlled to control the action amplitude of the back flushing rod and the pushing rod. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1Front view of the continuous lengthening extruding machine of the present application;

[0021] Figure 2 Front view of the continuous lengthening extruding machine of the present application;

[0022] Figure 3 Perspective view of the feeding mechanism, the molding die assembly and the transmission mechanism;

[0023] Figure 4 Sectional view of the feeding mechanism, the molding die assembly and the transmission mechanism through the installation cavity;

[0024] Figure 5 Sectional view of the feeding mechanism and the molding die assembly through the installation cavity;

[0025] Figure 6 Sectional view of the feeding mechanism and the molding die assembly through the material receiving channel.

[0026] Reference signs: 1, frame; 2, feeding mechanism; 22, conveying pipe; 23, material delivery device; 231, material discharge cylinder; 232, material pressing rod; 24, material pushing rod; 3, molding die assembly; 31, die holder; 311, liquid discharge hole; 312, material receiving channel; 32, variable diameter die; 33, back flushing rod; 34, wear-resistant cap; 341, compression spring; 35, guide die; 4, transmission mechanism; 41, fixed seat; 42, rotating shaft; 43, first swing arm; 431, top pin; 44, second swing arm; 451, first pull rod; 452, second pull rod; 453, threaded sleeve; 46, swing rod; 5, feeding slide; 6, product. DETAILED DESCRIPTION

[0027] REFERENCE Figures 1 to 6 Further description of the embodiments of the continuous lengthening extruding machine of the present application.

[0028] In the description of the present application, it should be noted that for the orientation words, such as the terms “center”, “transverse (X)”, “longitudinal (Y)”, “vertical (Z)”, “length”, “width”, “thickness”, “upper”, “lower”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inner”, “outer”, “clockwise”, “counterclockwise”, etc. indicate the orientation and positional relationship based on the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and cannot be understood as limiting the specific protection scope of the present application.

[0029] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features. Thus, the use of "first" and "second" to define a feature may explicitly or implicitly include one or more of that feature. In the description of this invention, "several" or "a number" means two or more, unless otherwise explicitly specified.

[0030] A continuous elongation extrusion machine includes a frame 1, on which a feeding mechanism 2, a forming die assembly 3, a feeding slide 5, and a transmission mechanism 4 are arranged. The forming die assembly 3 includes a plurality of forming dies and forming die pressure heads, which can also be called punches. The forming die includes a die base 31, on which a through-hole mounting cavity is provided. At least two variable diameter dies 32 are arranged in the mounting cavity, and a seepage gap is formed between two adjacent variable diameter dies 32. A cooling pipe is provided on the die base 31 and communicates with the mounting cavity, and a cooling medium is introduced into the cooling pipe.

[0031] In this embodiment, the structure of the feeding slide 5 can be adopted from the prior art disclosed in CN214639454U, and its function is the same as that of this application.

[0032] In one embodiment, a return rod 33 is provided on the mold base 31 behind the mounting cavity. The return rod 33 is connected to the transmission mechanism 4 and is used to push out the drawn product 6.

[0033] In this embodiment, "front" refers to the side of the forming mold facing the forming mold pressure head, and "rear" refers to the side of the forming mold facing the return punch 33.

[0034] like Figure 5 As shown, in this embodiment, three variable diameter dies 32 are used as an example. The cooling pipe is preferably located at the top. By introducing a cooling medium into the cooling pipe, the cooling medium will flow into the inner wall of the variable diameter die 32 along the seepage gap between the two variable diameter dies 32. When the product 6 is stretched, the product 6 is placed into the entrance of the variable diameter die 32 by the feeding slide 5. The corresponding forming die head extends into the variable diameter die 32 to squeeze the product 6, causing it to stretch. At the same time, the product 6 rubs against the variable diameter die 32. The cooling medium inside the variable diameter die 32 directly contacts the surface of the product 6 and cools the product 6 directly and uniformly. Furthermore, the cooling medium in this invention can be an oil with lubricating function, which also serves the purpose of lubrication during the stretching process of the product 6.

[0035] In this preferred embodiment, a drain hole 311 is provided on the mold base 31 to the rear of the variable diameter mold 32. The drain hole 311 extends downward from the mounting cavity through the bottom end of the mold base 31. When the product 6 is fed into the variable diameter mold 32, the excess cooling medium will be discharged through the drain hole 311.

[0036] In this preferred embodiment, a distribution cavity is provided in the mold base 31 at the connection between the cooling pipe and the mounting cavity, and the distribution cavity connects all the seepage gaps.

[0037] like Figure 5 As shown, the distribution chamber can temporarily store a portion of the cooling medium, which can be evenly distributed into the seepage gaps of the partition strip.

[0038] In one embodiment, a buffer cavity is provided between two adjacent variable diameter dies 32, and the buffer cavity is connected to the inner hole of the variable diameter die 32.

[0039] like Figure 5 As shown, the buffer cavity is located in front of the variable diameter die 32, which forms a step-like shape in front of the variable diameter die 32. This buffer cavity can store a portion of the cooling medium. In particular, when the cooling medium is oil, the oil has a certain viscosity and can be stored in the buffer cavity to ensure that the variable diameter die 32 always has a cooling medium for cooling and lubrication during the drawing process of product 6.

[0040] In this preferred embodiment, a guide mold 35 is also provided in the mounting cavity. The guide mold 35 is located at the front end of the mounting cavity and has a large tapered opening to allow the product 6 to be smoothly fed into the variable diameter mold 32.

[0041] In one embodiment, the cooling pipe is connected to a pressure pump, which can be used to control the speed at which the cooling medium is fed into the variable diameter mold 32.

[0042] like Figure 6 As shown, the preferred feeding mechanism 2 in this embodiment includes a blind hole hook feeding device, a conveying pipe 22, and a delivery device 23. The delivery device 23 includes a discharge cylinder 231. A receiving channel 312 that runs through the front and back is provided on the mold base 31. The bottom end of the discharge cylinder 231 is connected to the receiving channel 312. A spring pin is provided at the bottom of the discharge cylinder 231. A pressure rod 232 is provided at the top of the discharge cylinder 231. A push rod 24 is provided on the mold base 31 behind the receiving channel 312. The push rod 24 is connected to the transmission mechanism 4. The two ends of the conveying pipe 22 are respectively connected to the blind hole hook feeding device and the delivery device 23.

[0043] The hook-type feeding device for blind hole parts can adopt the structure in the applicant's earlier application CN111559630A. The conveying pipe 22 is a bent spring tube, one end of which is connected to the guide column at the bottom of the hook-type feeding device for blind hole parts.

[0044] One end of the spring pin extends into the discharge cylinder 231, and the end extending into the discharge cylinder 231 is an arc surface or a spherical surface, as long as it can block the naturally falling product 6. When subjected to pressure, it can retract and pop out of the discharge cylinder 231.

[0045] In operation, the workpieces are arranged by the blind hole hook feeding device and introduced into the discharging cylinder 231 through the conveying pipe 22. The discharging cylinder 231 is preferably arranged vertically, and a plurality of products 6 to be processed are stacked in the discharging cylinder 231 from bottom to top. The lowermost product 6 is blocked by the spring pin. When the upper pressing rod 232 moves downward, it presses the uppermost product 6, so that the lowermost product 6 falls over the spring pin into the receiving channel 312. The product 6 is pushed forward by the pushing rod 24 behind the receiving channel 312, is grabbed by the feeding slide table 5 and is translated to the next station (where the variable-diameter die 32 is arranged) to perform the stretching operation. Thus, the one-stretching, two-stretching, three-stretching, four-stretching, and so on of the product 6 are completed, so that the continuous lengthening (without extrusion) of the product 6 on the machine tool is completed. Through the action of the pressing rod 232 and the spring pin, the intermittent feeding of the product 6 from the discharging cylinder 231 to the receiving barrel is realized.

[0046] As shown in Figure 3 and 4 , the transmission mechanism 4 preferably comprises a fixed seat 41, a rotating shaft 42 rotatably connected to the fixed seat 41, a first swing arm 43 arranged on the rotating shaft 42, and the backflush rod 33 and the pushing rod 24 extend rearward to the fixed seat 41 and abut against the first swing arm 43. Compressive springs 341 are arranged on the backflush rod 33 and the pushing rod 24, and the backflush rod 33 and the pushing rod 24 are moved rearward by the compressive springs 341.

[0047] Specifically, the end of the backflush rod 33 and the pushing rod 24 towards the first swing arm 43 is provided with an anti-wear cap 34, and the end of the first swing arm 43 is provided with a spherical top pin 431 abutting against the anti-wear cap 34.

[0048] Preferably, the rotating shaft 42 is further provided with a second swing arm 44, the second swing arm 44 is connected with a pull rod, the pull rod is connected with a swing rod 46, the swing rod 46 is rotatably connected to the rack 1. The pull rod comprises a first pull rod 451, a second pull rod 452 and a threaded sleeve 453. The first pull rod 451 is connected with the swing rod 46, the second pull rod 452 is connected with the second swing arm 44, and the threaded sleeve 453 is threadedly connected with the first pull rod 451 and the second pull rod 452, and the threaded sleeve 453 is provided with left and right threads.

[0049] Generally, the power of the swing lever 46 is the same as that of the forming die pressing head, and the two are linked. In operation, the swing lever 46 swings, so that the pull rod moves forward and backward, and then the second swing arm 44 swings, the rotating shaft 42 rotates, the first swing arm 43 synchronously swings with the rotating shaft 42, the top pin 431 on the first swing arm 43 always abuts against the wear-resistant cap 34, so that the backflush rod 33 and the pushing rod 24 realize forward and backward movement. When the backflush rod 33 and the pushing rod 24 are extruded forward by the first swing arm 43, the products 6 can be pushed out. When the first swing arm 43 swings back to reset, the compression spring 341 makes the backflush rod 33 and the pushing rod 24 move backward, that is, makes the wear-resistant cap 34 always contact with the top pin 431, so that knocking noise is prevented.

[0050] Meanwhile, in the present application, the first pull rod 451 and the second pull rod 452 can be made close to or away from each other by rotating the threaded sleeve 453, that is, the length of the pull rod as a whole is adjusted, and then the initial position of the second swing arm 44 is controlled, or in other words, the swing area of the second swing arm 44 is controlled, so as to adjust according to different products 6.

[0051] The above is only the preferred embodiment of the present application, and the protection scope of the present application is not limited to the above-mentioned embodiments. Any technical scheme falling within the idea of the present application belongs to the protection scope of the present application. It should be noted that, for ordinary skilled in the art, some improvements and decorations without departing from the principle of the present application should also be considered as the protection scope of the present application.

Claims

1. A continuous elongation extrusion machine, comprising a frame, on which a feeding mechanism, a forming die assembly, a feeding slide, and a transmission mechanism are arranged, characterized in that: The molding die assembly includes several molding dies and molding die heads. Each molding die includes a die base with a through-hole mounting cavity. At least two variable diameter dies are provided in the mounting cavity, and a seepage gap is formed between two adjacent variable diameter dies. A cooling pipe is provided on the die base and communicates with the mounting cavity. A cooling medium is introduced into the cooling pipe. A distribution cavity is provided in the mold base at the connection between the cooling pipe and the mounting cavity, and the distribution cavity connects all the seepage gaps; A buffer cavity is provided between two adjacent variable diameter dies, and the buffer cavity is connected to the inner hole of the variable diameter die; The feeding mechanism includes a blind hole hook feeding device, a conveying pipe, and a delivery device. The delivery device includes a discharge cylinder. The mold base has a through-flow receiving channel. The bottom end of the discharge cylinder is connected to the receiving channel. A spring pin is provided at the bottom of the discharge cylinder. A pressure rod is provided at the top end of the discharge cylinder. A push rod is provided on the mold base behind the receiving channel. The push rod is connected to a transmission mechanism. The two ends of the conveying pipe are respectively connected to the blind hole hook feeding device and the delivery device. A return rod is provided behind the mounting cavity on the mold base, and the return rod is connected to the transmission mechanism; A drain hole is provided at the rear of the variable diameter mold on the mold base. The drain hole extends downward from the mounting cavity through the bottom of the mold base. When the product is fed into the variable diameter mold, the excess cooling medium will be discharged through the drain hole. The transmission mechanism includes a fixed base, a rotating shaft rotatably connected to the fixed base, a first swing arm provided on the rotating shaft, one end of the return rod and the push rod extending backward to the fixed base and abutting against the first swing arm, and a compression spring provided on the return rod and the push rod, the compression spring causing the return rod and the push rod to move backward; The return rod and the push rod are provided with wear-resistant caps at the ends facing the first swing arm, and the end of the first swing arm is provided with a spherical top pin, which abuts against the wear-resistant cap. The rotating shaft is also provided with a second swing arm, the second swing arm is connected to a tie rod, the tie rod is connected to a swing rod, and the swing rod is rotatably connected to the frame. The tie rod includes a first tie rod, a second tie rod, and a threaded sleeve. The first tie rod is connected to the swing rod, the second tie rod is connected to the second swing arm, and the threaded sleeve is threaded to the first tie rod and the second tie rod, and the threaded sleeve is provided with left and right threads.

2. The continuous extrusion machine according to claim 1, characterized in that: A guide mold is also provided inside the mounting cavity, and the guide mold is located at the front end of the mounting cavity.

3. The continuous extrusion machine according to claim 2, characterized in that: The cooling pipe is connected to a pressure pump.

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