In-mold cooling structure for extrusion forming mold

Abstract

According to the in-mold cooling structure for the extrusion forming mold, the in-mold cooling structure can be started after a workpiece leaves the range of a punch, the entering time of a spray head is saved, four-point segmented spraying in the mold is achieved, rapid cooling is achieved, the phenomenon that a lubricating layer is accumulated or lubrication is not in place is avoided, and the service life of the mold is prolonged. And meanwhile, discharging operation can be immediately carried out after spraying is finished, compared with a conventional graphite spraying mode that feeding is carried out after a spraying arm is moved out, the feeding time is saved, rapid drainage in the mold is achieved finally, and the phenomenon of material bouncing caused by instant gasification after internal accumulated water encounters discharged high-temperature blanks and enters the inner mold is avoided.

Description

Technical Field

[0001] The invention relates to the technical field of hot extrusion dies, and in particular to an in-die cooling structure for an extrusion molding die. Background Art

[0002] In existing technology, hot extrusion dies require cooling and lubrication during the production process. This cooling and lubrication is mostly achieved by spraying water-based graphite (graphite and water mixed in a certain ratio). Hot extrusion effectively reduces the extrusion forming force, but the heat of the workpiece is transferred to the die during the extrusion process. Friction during the extrusion process also generates heat. Long-term high-temperature operation can significantly reduce the life of the die. Cooling and lubrication can effectively improve the working conditions of the die during the forming process. Water-based graphite spraying (hereinafter referred to as graphite spraying) meets both lubrication and die cooling requirements and is therefore widely used.

[0003] However, in the era of pursuing efficiency, the conventional graphite spraying method is to use a spraying robot or a corresponding simple mechanism. After one extrusion is completed, the workpiece is taken out, and then extended from the outside of the mold to the inside of the mold for spraying. After completion, it is removed and then the workpiece can be extruded. These processes must be carried out in sequence, so there is a certain amount of waiting for spraying. Usually an extrusion production cycle takes about 8-10 seconds, and the spraying process takes 2-2.5 seconds, accounting for 20%-25% of the entire production cycle.

[0004] Therefore, the current production structure of extrusion molding needs to be adjusted urgently. Summary of the Invention

[0005] In view of the problems existing in the prior art, the present invention provides an in-mold cooling structure for an extrusion molding die to solve the technical problem in the prior art that the current extrusion molding production structure urgently needs to be adjusted.

[0006] The present invention provides an in-mold cooling structure for an extrusion mold, comprising:

[0007] An upper mold plate is provided at the center thereof with an upper mold bearing plate, and the four corners of the bottom of the upper mold plate are respectively connected to one end of the guide sleeve assembly;

[0008] The bottom of the upper die pressure plate is connected to an upper die pressure block, and the upper surface, lower surface and peripheral side of the upper die pressure block are all provided with flow channels. The bottom of the upper die pressure block is connected to a punch and a punch sleeve arranged around the punch, and the peripheral side of the upper die pressure block is provided with an upper die seat fixedly connected thereto. An annular flow channel matching the flow channel is provided inside the upper die seat, and the annular flow channel is connected to the first water inlet.

[0009] The other end of the guide sleeve assembly passes through the spray beam and is connected to the lower template. Copper conduits are respectively provided at both ends of the spray beam. An annular spray sleeve is provided in the middle of the spray beam. An outer ring groove is provided on the outer circumference of the spray sleeve. The outer ring groove is connected to the second water inlet provided on either side of the spray beam.

[0010] A lower mold bearing plate is provided in the middle of the lower mold plate, a return water port is provided on either side of the lower mold plate, and a first inner ring groove is opened in the middle of the lower mold plate, a return water pipe is provided on the side of the first inner ring groove, and the return water pipe is connected to the return water port, a lower mold pressure block is provided on the top of the lower mold bearing plate, and an annular water groove is provided on the upper end surface of the lower mold bearing plate, a longitudinal guide groove is provided on the side thereof, a sink groove matching the annular water groove is provided on the lower surface of the lower mold pressure block, a radial guide groove is provided on the upper surface thereof, and a radial drainage hole is provided in the middle of the lower mold pressure block;

[0011] The top of the lower mold pressure block is connected with an extrusion die, and the top of the extrusion die is connected with a guide die. The peripheral surface of the guide groove is evenly distributed with oblique guide holes, and the top of the guide die is connected to the bottom of the spray beam. The outer peripheral side of the guide die is fixedly connected with a lower mold cover, the inner peripheral side of the lower mold cover is provided with a second inner ring groove, and the outer peripheral side of the lower mold cover is provided with a third water inlet connected to the second inner ring groove, the peripheral side of the extrusion die and the lower mold pressure block are fixedly connected with a lower mold base, and the outer peripheral side of the lower mold base is provided with a fourth water inlet connected to the lower mold pressure block.

[0012] Optionally, the guide sleeve assembly includes:

[0013] A small guide post, one end of which is connected to any corner of the bottom of the lower template, and the other end of which passes through the copper conduit to connect the adjustment pad and the mold frame guide post in sequence, and a compression spring is also provided on the circumference of the small guide post.

[0014] Optionally, it also includes:

[0015] A material ejector rod and a lower die push rod, wherein the material ejector rod is movably arranged in the middle of the lower die pressure block, the lower die push rod is movably arranged in the middle of the lower die bearing plate, and the front end of the material ejector rod abuts against the rear end of the lower die push rod.

[0016] Optionally, it also includes:

[0017] The annular flow channel is at the same height as the first water inlet, the outer annular groove is at the same height as the second water inlet, and the second inner annular groove is at the same height as the third water inlet.

[0018] Optionally, it also includes:

[0019] A mold frame guide sleeve is also sleeved on the circumference of the compression spring, and the mold frame guide sleeve is arranged corresponding to the mold frame guide column.

[0020] Compared with the prior art, the present invention:

[0021] When the present invention is in use, it can start after the workpiece leaves the range of the punch, saving the entry time of the nozzle, and realizes 4-point segmented spraying in the mold, realizing rapid cooling, and avoiding the accumulation of the lubricating layer or the phenomenon of inadequate lubrication. At the same time, the discharge operation can be started immediately after the spraying is completed. Compared with conventional graphite spraying, the spraying arm needs to be moved out before loading, which saves loading time. Finally, rapid drainage of the mold is also achieved, avoiding the phenomenon of material bouncing caused by the instantaneous vaporization of the high-temperature blank after discharge after entering the inner mold due to internal accumulated water. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention.

[0023] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0024] Figure 1 This is a schematic diagram of the overall structure of the present invention in a compressed state;

[0025] Figure 2 It is a schematic diagram of the overall structure of the present invention in a stretched state.

[0026] Description of reference numerals:

[0027] 1. Upper template; 2. Upper die bearing plate; 3. Upper die pressure block; 4. Punch; 5. Punch sleeve; 6. Upper die base; 7. Die frame guide sleeve; 8. First water inlet; 9. Spray beam; 10. Copper conduit; 11. Spray sleeve; 12. Second water inlet; 13. Lower template; 14. Lower die bearing plate; 15. Return water port; 16. Lower die pressure block; 17. Extrusion die; 18. Guide die; 19. Lower die cover; 20. Third water inlet; 21. Lower die base; 22. Fourth water inlet; 23. Small guide post; 24. Adjustment pad; 25. Die frame guide post; 26. Compression spring; 27. Ejector rod; 28. Lower die ejector rod; 29. ​​Large nut; 30. Lock nut; 31. Workpiece; 32. Return water pipe. DETAILED DESCRIPTION

[0028] In order to make the purpose, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other implementation cases obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application. The functional units with the same labels in the examples of the present invention have the same and similar structures and functions.

[0029] See also Figure 1 and Figure 2 The present invention provides an in-mold cooling structure for an extrusion mold, comprising:

[0030] An upper mold plate 1, wherein an upper mold bearing plate 2 is provided in the middle thereof, and the four corners of the bottom of the upper mold plate 1 are respectively connected to one end of the guide sleeve assembly;

[0031] The bottom of the upper die pressure plate is connected to an upper die pressure block 3, and flow channels are provided on the upper surface, lower surface and peripheral side of the upper die pressure block 3. The bottom of the upper die pressure block 3 is connected to a punch 4 and a punch sleeve 5 arranged around the punch 4, and the peripheral side of the upper die pressure block 3 is ringed with an upper die base 6 fixedly connected thereto. An annular flow channel matching the flow channel is provided inside the upper die base 6, and the annular flow channel is connected to the first water inlet 8;

[0032] The other end of the guide sleeve assembly passes through the spray beam 9 and is connected to the lower template 13. Copper conduits 10 are respectively provided at both ends of the spray beam 9. An annular spray sleeve 11 is provided in the middle of the spray beam 9. An outer ring groove is provided on the outer periphery of the spray sleeve 11. The outer ring groove is connected to a second water inlet 12 provided on either side of the spray beam 9.

[0033] A lower die bearing plate 14 is provided in the middle of the lower template 13, a return water port 15 is provided on either side of the lower template 13, and a first inner ring groove is opened in the middle of the lower template 13, a return water pipe 32 is provided on the side of the first inner ring groove, and the return water pipe 32 is connected to the return water port 15, a lower die pressure block 16 is provided on the top of the lower die bearing plate 14, and an annular water groove is provided on the upper end surface of the lower die bearing plate 14, and a longitudinal guide groove is provided on the side thereof, the lower surface of the lower die pressure block 16 is provided with a sink matching the annular water groove, and a radial guide groove is provided on the upper surface thereof, and a radial drainage hole is provided in the middle of the lower die pressure block 16;

[0034] The top of the lower mold pressure block 16 is connected with an extrusion die 17, and the top of the extrusion die 17 is connected with a guide die 18. The peripheral surface of the guide groove is evenly distributed with oblique guide holes, and the top of the guide die 18 is connected to the bottom of the spray beam 9. The outer peripheral side of the guide die 18 is fixedly connected with a lower mold cover 19, and the inner peripheral side of the lower mold cover 19 is provided with a second inner ring groove, and the outer peripheral side of the lower mold cover 19 is provided with a third water inlet 20 connected to the second inner ring groove. The peripheral side of the extrusion die 17 and the lower mold pressure block 16 is fixedly connected with a lower mold base 21, and the outer peripheral side of the lower mold base 21 is provided with a fourth water inlet 22 connected to the lower mold pressure block 16.

[0035] In this embodiment, the upper die bearing plate 2 is installed inside the upper die plate 1, and flow channels are left on the upper and lower surfaces and sides of the upper die pressure block 3 according to design requirements; the upper die base 6 and the large nut 29 are connected and fixed by a thread M, which is first screwed in for a distance, and then the punch 4 and the punch sleeve 5 are installed together and placed in the upper die base 6, and then the upper die pressure block 3 is pressed on the cross section of the punch 4, wherein the upper cross section of the upper die base 6 has annular evenly distributed mounting holes and positioning pins, a water inlet on the side, and an annular flow channel on the inner wall of the internal center hole, and the flow channel is consistent in height with the first water inlet 8; the punch sleeve 5 is processed with a guide hole slot box and a cooling water annular groove;

[0036] A set of mold frame guide sleeves 7 are installed at the four corners of the bottom of the upper mold plate 1. A compression spring 26 is provided inside the mold frame guide tube. A small guide column 23 is provided inside the compression spring 26. The small guide column 23 passes through the spray beam 9 from bottom to bottom. An adjustment pad 24 and two locking nuts 30 (for mutual locking) are installed on the bottom of the small guide column 23 from top to bottom. The bottom of the adjustment pad 24 is connected to the mold frame guide column 25. The distribution spacing of the mold frame guide sleeve 7 is the same as that of the mold frame guide column 25, and the two cooperate with each other for guidance.

[0037] A copper guide sleeve is installed in the inner holes at both ends of the spray beam 9, and an internal spray sleeve 11 is installed in the inner hole in the center. The copper guide sleeve and the spray sleeve 11 are fixed to the spray beam 9 by screws. A second water inlet 12 can be provided on either side of the spray beam 9. The copper guide sleeve has a lubrication oil filling hole to facilitate the lubrication of the small guide column 23. The outer ring of the spray sleeve 11 has an outer ring groove, and the outer ring groove is at the same height as the second water inlet 12 of the spray beam 9;

[0038] When the small guide pillars 23 are passed through the copper guide sleeves at both ends of the spray beam 9 and the punch 4 passes through the spray sleeve 11, the structure on the top of the spray beam 9 is collectively described as an upper die.

[0039] Place the lower die support plate 14 in the center hole of the lower die plate 13, and the lower die push rod 28 in the center hole of the lower die support plate 14. Four sets of die frame guide posts 25 are installed and fixed to the four corners of the lower die plate 13, corresponding to the die frame guide sleeves 7 in the upper die. Use locating pins to position the lower die base 21 with the lower die plate 13 completed in the previous step, and then secure it with screws. Put the lower die pressure block 16 into the inner hole of the lower die base 21, and then put the ejector rod 27 into the air inside the lower die pressure block 16; then install the extrusion die 17 and the guide die 18 in sequence, and then put the lower die pressing cover 19 on the top layer, press the extrusion die 17 through the lower die pressing cover 19, and then lock the lower die base 21 and the lower die pressing cover 19 with screws. A second inner ring groove is provided on the inner circumference of the lower die pressing cover 19, and a third water inlet 20 connected to the second inner ring groove is provided on the outer circumference of the lower die pressing cover 19; wherein, the peripheral surface of the guide groove is provided with oblique guide holes, and the ejector rod The two ends of 27 are larger than the middle part, and respectively cooperate with the lower die pressure block 16 and the extrusion die 17. There is a guide groove on the side of the material return rod 27; the lower surface of the lower die pressure block 16 is provided with a sink matching the annular water trough, and its upper surface is provided with a radial guide groove, and the middle part of the lower die pressure block 16 is provided with a radial drainage hole; a fourth water inlet 22 is opened on the side of the lower die seat 21, and a positioning pin hole and a screw hole are provided at the bottom for fixing with the lower template 13. The upper end face has an annularly distributed threaded hole and the lower die cover 19 for fixing and locking between the two. The structure at the bottom of the above-mentioned spray beam 9 is collectively referred to as the lower die.

[0040] In another embodiment, the working principle of the in-mold cooling structure is:

[0041] See also Figure 1 and Figure 2 During the extrusion process, the compression spring 26 is in a compressed state. After the extrusion is completed, the upper die moves upward. When the upper die moves 0-S0, the compression spring 26 rebounds until the spray port of the spray sleeve 11 just reaches the lower end of the punch 4 (where the temperature is relatively highest). The cooling and lubrication effect is optimal during the spraying process. (The spray position can be adjusted by grinding the pad 24 as needed)

[0042] At this time (upper die retraction stroke S0), the lower ejector cylinder pushes the lower die ejector rod 28 upward, and then pushes the ejector rod 27 to drive the workpiece 31 upward to the stroke S2.

[0043] The upper die continues to move upward, driving the punch 4 and the spray gauge to move upward and away from the lower guide die 18. When the upper die moves upward S1, the distance H between the lower end of the punch 4 and the upper end surface of the lower die cover 19 is greater than the height of the workpiece 31. When S2 and H are met at the same time, the workpiece can be taken out.

[0044] When the workpiece 31 is clamped, the ejector cylinder retreats, and the lower die ejector rod 28 drives the ejector rod 27 downward to the ejector cylinder stroke S3 and stops.

[0045] When the workpiece 31 moves out of the upper end surface of the lower mold cover 19, the graphite spraying device starts working and sprays from the first water inlet 8, the second water inlet 12, the third water inlet 20 and the fourth water inlet 22 respectively:

[0046] The first water inlet 8 is primarily used for lubricating and cooling the upper end of the upper die. Cooling water enters along the direction indicated by the arrow in the flow channel, and then flows downward along the punch 4. (Because the punch 4 is long and hot, the water temperature at the lower end of the flow channel is higher or the lubricating graphite has accumulated on the upper part, making the lubrication and cooling effect at the lower end very poor. Therefore, a spray sleeve 11 is added to the spray beam 9.)

[0047] The second water inlet 12 can be set at the back of the spray beam 9. After the graphite spraying is turned on, the ink enters along the ring groove of the spray sleeve 11 and is sprayed on the lower end of the punch 4 to achieve rapid cooling and form a lubricating mold.

[0048] The third water inlet 20 is located on the side of the lower die cover 19. After the graphite spraying is activated, the ink flows along the annular groove in the inner bore of the lower die cover 19 into the guide hole in the guide die 18, thereby cooling and lubricating the extrusion die 17. The graphite flows downward along the inner wall of the extrusion die 17. Because the ejector rod 27 has a large gap with the extrusion die 17 after being ejected a distance S3, the cooled "high-temperature water" can be quickly discharged into the inner bore of the lower die pressure block 16, effectively solving the problem of water accumulation in the die.

[0049] The fourth water inlet 22 is located on the side wall of the lower die base 21. After the graphite spraying is turned on, the ink flows along the annular groove and flow channel of the lower die pressure block 16 into the internal hole, achieving rapid cooling and lubrication of the ejector rod 27. (Because the ejector rod 27 is long and in contact with the workpiece 31 for a long time, its temperature is relatively high. After the graphite from the third water inlet 20 enters the extrusion die 17, the temperature rises and the amount of graphite decreases. By the time it reaches the lower end of the ejector rod 27, the lubrication and cooling effect is already poor. Therefore, the fourth water inlet 22 is added.)

[0050] The return water port 15 is located on the side of the lower mold. When the used graphite is discharged along the gap between the inner hole of the extrusion die 17 and the material return rod 27, it enters the outer ring groove of the lower mold bearing plate 14 and is recovered along the return water pipe on the lower mold plate 13.

[0051] The present invention adopts in-mold spraying, which can be started after the workpiece 31 leaves the range of the punch 4, saving the entry time of the nozzle, and realizing 4-point segmented spraying in the mold, realizing rapid cooling, and avoiding the phenomenon of lubricating layer accumulation or inadequate lubrication. At the same time, the material discharge operation can be immediately entered after the spraying is completed. Compared with conventional graphite spraying, the spraying arm needs to be moved out before loading, which saves loading time. Finally, rapid drainage in the mold is also achieved to avoid the phenomenon of material rebound caused by the instantaneous gasification of the high-temperature blank after the internal water accumulation encounters the high-temperature blank after the discharge and enters the inner mold. Therefore, from an economic point of view, in-mold spraying saves time and saves the cost of purchasing a robotic arm used for external spraying. Reducing the power mechanism, reducing the movement from the production line perspective, and improving the stability of the production line.

[0052] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article, or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or device. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of other identical elements in the process, method, article, or device comprising the element.

[0053] The foregoing description is intended only to provide specific embodiments of the present invention, which will enable those skilled in the art to understand and implement the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not intended to be limited to the embodiments shown herein, but is intended to be accorded the widest scope consistent with the principles and novel features claimed herein.

Claims

1. An in-mold cooling structure for an extrusion mold, characterized in that: include: An upper mold plate (1) is provided with an upper mold bearing plate (2) in the middle thereof, and the four corners of the bottom of the upper mold plate (1) are respectively connected to one end of the guide sleeve assembly; The bottom of the upper die pressure plate is connected to an upper die pressure block (3), and the upper surface, lower surface and peripheral side of the upper die pressure block (3) are all provided with flow channels. The bottom of the upper die pressure block (3) is connected to a punch (4) and a punch sleeve (5) arranged around the peripheral side of the punch (4), and the peripheral side of the upper die pressure block (3) is provided with an upper die seat (6) fixedly connected thereto. An annular flow channel matching the flow channel is provided inside the upper die seat (6), and the annular flow channel is connected to the first water inlet (8); The other end of the guide sleeve assembly passes through the spray beam (9) and is connected to the lower template (13). Copper conduits (10) are respectively provided at both ends of the spray beam (9). An annular spray sleeve (11) is provided in the middle of the spray beam (9). An outer ring groove is provided on the outer peripheral side of the spray sleeve (11). The outer ring groove is connected to a second water inlet (12) provided on either side of the spray beam (9). A lower die bearing plate (14) is provided in the middle of the lower template (13), a return water port (15) is provided on either side of the lower template (13), and a first inner ring groove is opened in the middle of the lower template (13), a return water pipe (32) is provided on the side of the first inner ring groove, and the return water pipe (32) is connected to the return water port (15), a lower die pressure block (16) is provided on the top of the lower die bearing plate (14), and an annular water groove is provided on the upper end face of the lower die bearing plate (14), and a longitudinal guide groove is provided on the side face thereof, a sink groove matching the annular water groove is provided on the lower surface of the lower die pressure block (16), and a radial guide groove is provided on the upper surface thereof, and a radial drainage hole is provided in the middle of the lower die pressure block (16); The top of the lower die pressure block (16) is connected to an extrusion die (17), the top of the extrusion die (17) is connected to a guide die (18), the peripheral surface of the guide groove is evenly distributed with oblique guide holes, and the top of the guide die (18) is connected to the bottom of the spray beam (9), the outer peripheral side of the guide die (18) is fixedly connected to a lower die cover (19), the inner peripheral side of the lower die cover (19) is provided with a second inner ring groove, and the outer peripheral side of the lower die cover (19) is provided with a third water inlet (20) connected to the second inner ring groove, the peripheral side of the extrusion die (17) and the lower die pressure block (16) are fixedly connected with a lower die seat (21), and the outer peripheral side of the lower die seat (21) is provided with a fourth water inlet (22) connected to the lower die pressure block (16).

2. The in-mold cooling structure for an extrusion mold according to claim 1, wherein: The guide sleeve assembly comprises: A small guide post (23), one end of which is connected to any corner of the bottom of the lower template (13), and the other end of which passes through the copper conduit (10) and is sequentially connected to the adjustment pad (24) and the mold frame guide post (25), and a compression spring (26) is also sleeved on the circumference of the small guide post (23).

3. The in-mold cooling structure for an extrusion mold according to claim 1, wherein: Also includes: A material ejector rod (27) and a lower die push rod (28), wherein the material ejector rod (27) is movably arranged in the middle of the lower die pressure block (16), and the lower die push rod (28) is movably arranged in the middle of the lower die bearing plate (14), and the front end of the material ejector rod (27) abuts against the rear end of the lower die push rod (28).

4. The in-mold cooling structure for an extrusion mold according to claim 1, wherein: Also includes: The annular flow channel is at the same height as the first water inlet (8), the outer annular groove is at the same height as the second water inlet (12), and the second inner annular groove is at the same height as the third water inlet (20).

5. The in-mold cooling structure for an extrusion mold according to claim 2, wherein: Also includes: A mold frame guide sleeve (7) is also sleeved on the circumferential side of the compression spring (26), and the mold frame guide sleeve (7) is arranged corresponding to the mold frame guide column (25).

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