Flexible positioning device for a punch

Abstract

The application relates to a flexible positioning device of a punch, which comprises a mounting base, a movable cavity and a through hole arranged at the bottom of the movable cavity; the mounting base is fixedly connected with an upper sliding block of a pressing machine; the punch comprises a movable end and a pressing end, the movable end can move in the movable cavity, and the pressing end penetrates through the through hole and is exposed outside the movable cavity; a plurality of groups of supporting adjusting components are arranged on the mounting base and are uniformly arranged around the central axis of the mounting base; the supporting adjusting component comprises a rolling piece which is movably connected with the mounting base and abuts against the side of the movable end far away from the upper sliding block; a die sleeve is arranged on the platform of the pressing machine and is located directly below the punch. In the process of pressing a propellant grain, the position of the punch can be flexibly adjusted by the supporting adjusting component when the punch is inserted into the die sleeve, the phenomena of scratching and impacting between the punch and the die sleeve are avoided, and the risk of causing accidents such as combustion and explosion is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of forming a propellant grain, and particularly relates to a flexible positioning device for a punch. BACKGROUND

[0002] The pressed explosive is generally in a loose powder or particle form. When the pressed explosive is used, it is needed to be put into a mold cavity of a pressing mold, and the hydraulic machine is used to press the explosive powder into a dense propellant grain by a punch. In order to ensure the uniformity of the overall density of the propellant grain, the punch and the mold cavity of the mold need to be cooperatively processed. The gap between the punch and the mold needs to be controlled between 0.01mm and 0.08mm, and the pressure of the punch on the surface of the explosive needs to reach 200-300MPa. Since the explosive powder is very sensitive to energy stimulation such as friction and impact, it is easy to cause combustion, explosion and other accidents in the process of pressing the propellant grain due to the friction or impact between the punch and the mold cavity. Therefore, the material of the punch and the mold and the cooperatively processing of the punch and the mold are required to be very high.

[0003] In the process of pressing a small-size propellant grain, the mold suitable for the small-size propellant grain is first placed on the platform of the hydraulic machine, and then the weighed explosive powder (commonly known as molding powder) is poured into the mold cavity of the mold. The punch is manually installed into the mold cavity, and then the punch is pressed by the upper slide block of the hydraulic machine until the propellant grain reaches the required size. Finally, the punch is taken out, and the small-size propellant grain is taken out. Since the gap between the punch and the inner surface of the mold is very small, it is needed to ensure that the punch does not tilt when it is inserted into the mold cavity, otherwise the jamming phenomenon will occur, which is extremely dangerous in the process of pressing the propellant grain.

[0004] In the process of pressing a large-size propellant grain or batch production, the mold suitable for the large-size propellant grain is also needed to be fixed on the platform of the hydraulic machine. Since the punch for pressing the large-size propellant grain is heavy, it is difficult to repeatedly insert the punch by manual operation. Meanwhile, the punch is also needed to be fixed on the upper slide block of the hydraulic machine, and the punch is repeatedly inserted by driving the upper slide block.

[0005] The traditional solution to the above situation is to first fix the punch or die sleeve on the hydraulic machine by bolts, and then adjust the position of the die sleeve or punch, and make the punch cooperate with the die sleeve to press the explosive powder. Since the cooperation gap between the punch and the die sleeve is very small, the cooperation gap is easily affected by the verticality of processing, the concentricity of the punch and the die sleeve, the levelness of the table, the uniformity of the fastening force of the connecting bolts, and the parallelism of the upper and lower slides of the press, which leads to the installation and adjustment of the punch and the die sleeve being very troublesome and time-consuming. Even after the punch and the die sleeve are adjusted, they will still change slightly in relative position, verticality of processing, and parallelism of the upper and lower slides of the press due to the strong pressure during the pressing of the propellant grain, which will cause scratching, impact and other phenomena when the punch is inserted into the die sleeve, thereby causing combustion, explosion and other accidents. SUMMARY

[0006] The present application provides a flexible positioning device for a punch to solve the technical problem that in the existing propellant grain pressing process, when the punch is inserted into the die sleeve, it is extremely easy to cause scratching, impact and other phenomena, thereby causing combustion, explosion and other accidents.

[0007] The present application discloses a flexible positioning device for a punch, comprising a mounting seat, a punch, a plurality of support adjusting assemblies, and a die sleeve. The mounting seat comprises a movable cavity and a through hole arranged at the bottom of the movable cavity, and the mounting seat is detachably connected with the upper slide of the press. The punch comprises a movable end and a pressing end, the movable end is movable in the movable cavity, and the pressing end penetrates through the through hole and is exposed outside the movable cavity. The plurality of support adjusting assemblies are arranged on the mounting seat and are uniformly arranged around the central axis of the mounting seat. The support adjusting assembly comprises a rolling element, the rolling element is movably connected to the mounting seat, and the rolling element abuts against the side of the movable end away from the upper slide. The die sleeve is arranged on the platform of the press and located directly below the pressing end.

[0008] Further, the bottom of the movable cavity is provided with a plurality of mounting holes, and the number of mounting holes is the same as the number of support adjusting assemblies. The support adjusting assembly is arranged in the mounting hole.

[0009] Optionally, the support adjusting assembly further comprises a mounting block and a spring. The mounting block is arranged in the mounting hole and located at the end of the mounting hole away from the upper slide. The rolling element is arranged in the mounting hole and oppositely arranged with the mounting block. One end of the spring is connected with the mounting block, and the other end of the spring is connected with the rolling element.

[0010] Preferably, the support adjusting assembly further comprises a jacking cylinder, and the jacking cylinder is arranged in the mounting hole. The telescopic end of the jacking cylinder is connected with the rolling element.

[0011] Further, the rolling element comprises a universal ball or a cow eye wheel.

[0012] Further, when the movable end is coaxial with the mounting base, the distance D between the outer side wall of the movable end and the cavity wall of the movable cavity is 6mm-10mm.

[0013] Further, when the movable end is in contact with the cavity bottom of the movable cavity, the distance d between the end face of the end close to the upper slider and the upper slider is 16mm-20mm.

[0014] Further, the ratio of D and d is 16:37.

[0015] Further, the cavity mouth of the die cavity of the die sleeve is provided with a chamfer.

[0016] The flexible positioning device of the punch provided by the present application can achieve the following technical effects:

[0017] 1. The flexible positioning device has simple structure, and through the cooperation of the rolling member and the spring or the cooperation of the rolling member and the jacking cylinder, the punch can be in a flexible suspended state in the pressing process of the propellant grain, the direction of the punch can be automatically guided by the die sleeve when the punch is inserted or pulled out, the friction and the like between the punch and the die sleeve are greatly reduced, the installation and the reliability in the pressing process of the propellant grain are improved, the position of the punch can be flexibly adjusted by the supporting and adjusting assembly when the punch is inserted into the die sleeve, the scratching and the impact between the punch and the die sleeve are avoided, and the risk of causing accidents such as combustion and explosion is reduced.

[0018] 2. The device can flexibly replace the punch through the detachable installation of the mounting base and the upper slider, the installation and adjustment efficiency of the punch is improved, and the production efficiency of the propellant grain is improved.

[0019] The foregoing general description and the following description are only exemplary and explanatory, and are not used to limit the present application. BRIEF DESCRIPTION OF DRAWINGS

[0020] One or more embodiments are exemplarily illustrated by corresponding drawings, the exemplary illustrations and the drawings do not constitute limitation on the embodiments, the elements with the same reference numerals in the drawings are regarded as similar elements, and wherein:

[0021] Figure 1 is a schematic view of one embodiment of the flexible positioning device of the punch;

[0022] Figure 2 is a sectional schematic view of one embodiment of the flexible positioning device of the punch;

[0023] Figure 3 is Figure 2 the enlarged view of A of

[0024] Figure 4is a sectional view of another embodiment of the flexible positioning device of the punch;

[0025] Figure 5 is Figure 4 an enlarged view of part B of

[0026] Figure 6 is Figure 2 an enlarged view of part C of

[0027] Reference signs:

[0028] 1, hydraulic press; 11, upper slide; 111, threaded hole; 12, platform; 2, die sleeve; 21, die cavity; 22, chamfer; 23, bearing disc; 3, punch; 31, movable end; 32, pressing end; 4, mounting seat; 41, movable cavity; 42, through hole; 43, mounting hole; 44, edge; 45, fixing hole; 5, support adjusting assembly; 51, mounting block; 52, spring; 53, rolling element; 54, flange; 55, jacking cylinder; 6, bolt. DETAILED DESCRIPTION

[0029] In order to make the purpose, technical scheme and advantages of the present application more clear, the present application is further described in detail below in combination with the drawings and examples, and it should be understood that the specific examples described herein are only used to explain the present application and do not limit the present application.

[0030] As shown in Figure 1 , Figure 2 , the present application discloses a flexible positioning device of a punch, which comprises a mounting seat 4, a punch 3, a plurality of support adjusting assemblies 5 and a die sleeve 2. The press machine comprises a pneumatic press or a mechanical press or a hydraulic press, and in the present application, the hydraulic press is taken as an example for introduction. The hydraulic press 1 comprises a platform 12 for containing the die sleeve 2 and an upper slide 11, which is installed at the telescopic end of the hydraulic cylinder of the hydraulic press 1.

[0031] As shown in Figure 2 , Figure 3 , the die sleeve 2 is integrally formed with a die cavity 21, which is used for filling molding powder. The die cavity 21 is provided with a chamfer 22 at the cavity opening, which facilitates the insertion of the pressing end 32 of the punch 3 into the die cavity 21. The die sleeve 2 is integrally formed with a bearing disc 23 at the end close to the platform 12. During the pressing and molding of the propellant grain, the bearing disc 23 can uniformly disperse the force of the punch 3 extruding the propellant grain to the platform 12 of the hydraulic press 1.

[0032] As shown in Figures 2 to 4As shown, the diameter of one end of the punch 3 is larger than that of the other end, the end with larger diameter is the movable end 31, and the end with smaller diameter is the pressing end 32. The mounting seat 4 is integrally formed with a cylindrical movable cavity 41 for accommodating the movable end 31 of the punch 3. The cavity bottom of the movable cavity 41 is configured with a through hole 42 for facilitating the pressing end 32 to pass through, and the through hole 42 is coaxially arranged with the mounting seat 4. Similarly, the cavity bottom of the movable cavity 41 is also configured with a plurality of mounting holes 43 which are uniformly arranged around the central axis of the through hole 42. The number of mounting holes 43 is the same as that of the support adjusting assemblies 5, and one mounting hole 43 is provided with a set of support adjusting assemblies 5. The outer wall of the mounting seat 4 is integrally formed with a rim 44 which is annularly arranged around the outer wall of the mounting seat 4 and located at one end of the mounting seat 4 close to the upper sliding block 11. The rim 44 is configured with a fixing hole 45. The upper sliding block 11 is configured with a threaded hole 111. First, the pressing end 32 of the punch 3 is passed through the through hole 42 of the mounting seat 4, and the movable end 31 of the punch 3 is located in the movable cavity 41 and can move in the movable cavity 41. When the rim 44 of the mounting seat 4 abuts against the upper sliding block 11, the bolt 6 is passed through the fixing hole 45 of the mounting seat 4 and screwed into the threaded hole 111 of the upper sliding block 11 to mount the mounting seat 4 on the upper sliding block 11. The mounting seat is detachably mounted on the upper sliding block, which facilitates the replacement and maintenance of the punch when the punch is damaged later. At the same time, when different sizes of pills need to be processed, different types of punches can also be replaced, and at this time, the die sleeve also needs to be replaced accordingly according to the punch.

[0033] Preferably, the number of mounting holes 43 is at least three, and the number of support adjusting assemblies 5 is at least three sets. The at least three sets of support adjusting assemblies 5 are uniformly arranged around the central axis of the through hole 42, which can stably support the movable end 31 of the punch 3 and adjust the movable end 31.

[0034] Optionally, as Figure 4 , Figure 5As shown, the support adjusting assembly 5 comprises a mounting block 51, a spring 52 and a rolling member 53. The mounting block 51 is cylindrical, one end of the mounting block 51 is welded with a flange 54, the mounting block 51 is inserted into the mounting hole 43, and the flange 54 of the mounting block 51 is in contact with the end face of the mounting seat 4 away from the upper slide block 11, a bolt 6 is passed through the hole on the flange 54 and the mounting block 51 is fixed on the mounting seat 4. The mounting block 51 is located at the end of the mounting hole 43 away from the upper slide block 11. The spring 52 is located in the mounting hole 43, one end of the spring 52 is welded to the mounting block 51, and the other end of the spring 52 is welded to the main body of the rolling member 53. The rolling member 53 can move up and down in the mounting hole 43, and the rolling member 53 can adopt a universal ball or a cow eye wheel. The rolling ball of the universal ball or the rolling wheel of the cow eye wheel is in contact with the side face of the movable end 31 away from the upper slide block 11, which facilitates the flexible rolling of the movable end 31 of the punch 3 in the movable cavity 41, thereby achieving the purpose of adjusting the position of the punch 3, and facilitating the insertion of the punch 3 into the mold cavity 21. In the prior art, after the punch 3 is fixedly installed with the upper slide block 11 of the hydraulic machine 1, the punch 3 is not movable, and when the punch 3 is inserted into the mold sleeve 2, it is extremely easy to cause scratching, impact and other phenomena, thereby causing combustion, explosion and other accidents. In the present embodiment, after the pressing end 32 of the punch 3 enters the mold cavity 21 of the mold sleeve 2, the movable end 31 of the punch 3 can move in the movable cavity 41 according to the mold cavity 21, thereby avoiding the combustion, explosion and other accidents caused by scratching, impact and other phenomena. In the pressing process of the cartridge, the self-adjusting mode of the punch with the mold sleeve is the flexible positioning of the punch 3.

[0035] After the pressing end 32 of the punch 3 enters the mold cavity 21, the pressing end 32 will drive the movable end 31 to move in the movable cavity 41, and the rolling member 53 is more conducive to the movement of the movable end 31, which is the first flexible positioning of the punch. When the pressing end 32 contacts the modeling powder in the mold cavity 21, as the punch 3 continues to press, the gap between the movable end 31 and the upper slide block 11 will become smaller, until the movable end 31 is in contact with the upper slide block 11, during which the spring 52 changes from the compressed state to the extended state, the spring 52 will push the rolling member 53 out of the mounting hole 43, and the rolling member 53 will always be in contact with the movable end 31, which is more conducive to the flexible positioning of the punch, which is the second flexible positioning of the punch.

[0036] Preferably, as Figure 2 , Figure 3As shown, the support adjustment assembly 5 includes a lifting cylinder 55 and a rolling element 53. A flange 54 is welded to the main body of the lifting cylinder 55, and the telescopic end of the lifting cylinder 55 is welded to the rolling element 53. One end of the main body of the lifting cylinder 55 is inserted into the mounting hole 43, and the flange 54 of the lifting cylinder 55 abuts against the end face of the mounting seat 4 away from the upper slider 11. Bolts are passed through the holes on the flange 54 to fix the lifting cylinder 55 to the mounting seat 4. The rolling element 53 can move up and down within the mounting hole 43. The rolling element 53 can be a universal ball or a bullseye wheel. The ball bearings of the universal ball or the rollers of the bullseye wheel abut against the side of the movable end 31 away from the upper slider 11. This arrangement facilitates the flexible insertion of the punch 3 into the mold cavity 21. The lifting cylinder 55 can more stably drive the rolling element 53 to move up and down, facilitating the support and adjustment of the movable end 31 of the punch 3 by the rolling element 53.

[0037] Optionally, such as Figure 6 As shown, when the movable end 31 is coaxially aligned with the mounting base 4, the distance between the outer wall of the movable end 31 and the cavity wall of the movable cavity 41 is D, and the value of D ranges from 6mm to 10mm. By further limiting the range of D, the movement range of the punch 3 is limited. If the value of D is less than 6mm, the flexibility of the punch's flexible positioning is insufficient; if the value of D is greater than 10mm, the punch will vibrate during the pressing of the bolus, which is not conducive to the pressing of the bolus. Preferably, the value of D ranges from 7mm to 9mm. Preferably, the value of D is 8mm. By limiting the value of D, the flexibility of the punch's flexible positioning can be ensured, and the pressing and forming of the bolus can also be facilitated.

[0038] Optionally, such as Figure 6 As shown, when the movable end 31 abuts against the bottom of the movable cavity 41, the distance between the end face of the movable end 31 closest to the upper slider 11 and the upper slider 11 is d, and the value of d ranges from 16mm to 20mm. By further limiting the value range of d, the second flexible positioning of the punch 3 is achieved. If the value of d is less than 16mm, the adjustment time for the second flexible positioning of the punch 3 is insufficient, and there is still a risk of scratching and impact between the punch 3 and the mold cavity 21; if the value range of d is greater than 20mm, the adjustment time for the second flexible positioning of the punch 3 is wasted. Optionally, the value range of d is 17mm to 19mm. Preferably, the value range of d is 17.5mm to 18.5mm. Preferably, the value range of d is 18mm. By limiting the value of d, the risk of scratching and impact can be avoided, and the processing time for pressing the bolus can be saved.

[0039] Preferably, the ratio of D to d is 16:37. By limiting the ratio of D to d, the risk of scratching and impact between the punch and the die is minimized, and the production efficiency of the propellant is improved.

[0040] The above description is only the preferred embodiment of the present application, and is not intended to limit the present application. Any modification, equivalent replacement and improvement made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A flexible positioning device for a punch, characterized in that include: The mounting base (4) includes a movable cavity (41) and a through hole (42) disposed at the bottom of the movable cavity (41); the mounting base (4) can be detachably connected to the upper slider (11) of the press; The punch (3) includes a movable end (31) and a pressing end (32). The movable end (31) is movable within the movable cavity (41), and the pressing end (32) passes through the through hole (42) and is exposed outside the movable cavity (41). Multiple sets of support and adjustment components (5) are disposed on the mounting base (4) and are evenly distributed around the central axis of the mounting base (4); The support adjustment assembly (5) includes a rolling element (53) which is movably connected to the mounting base (4) and abuts against the side of the movable end (31) away from the upper slider (11). A mold (2) is used to be set on the platform (12) of the press and is located directly below the pressing end (32); The bottom of the movable cavity (41) is provided with a plurality of mounting holes (43), the number of which is the same as the number of the support adjustment assembly (5); The support adjustment component (5) is disposed within the mounting hole (43); The support adjustment assembly (5) also includes: The mounting block (51) is disposed in the mounting hole (43) and located at the end of the mounting hole (43) away from the upper slider (11); the rolling element (53) is disposed in the mounting hole (43) and is disposed opposite to the mounting block (51); The spring (52) is connected at one end to the mounting block (51) and at the other end to the rolling element (53); When the movable end (31) and the mounting base (4) are coaxially arranged, the distance D between the outer wall of the movable end (31) and the cavity wall of the movable cavity (41) is in the range of 6mm to 10mm. When the movable end (31) abuts against the bottom of the movable cavity (41), the distance d between the end face of the movable end (31) near the upper slider (11) and the upper slider (11) is in the range of 16mm~20mm. When the punch (3) is inserted into the mold sleeve (2), the support adjustment component (5) guides the punch (3) along with the mold sleeve (2) and flexibly adjusts the position of the punch (3).

2. A flexible positioning device for a punch, characterized in that include: The mounting base (4) includes a movable cavity (41) and a through hole (42) disposed at the bottom of the movable cavity (41); the mounting base (4) can be detachably connected to the upper slider (11) of the press; The punch (3) includes a movable end (31) and a pressing end (32). The movable end (31) is movable within the movable cavity (41), and the pressing end (32) passes through the through hole (42) and is exposed outside the movable cavity (41). Multiple sets of support and adjustment components (5) are disposed on the mounting base (4) and are evenly distributed around the central axis of the mounting base (4); The support adjusting assembly (5) comprises a rolling member (53) movably connected to the mounting base (4), and the rolling member (53) abuts against one side of the movable end (31) away from the upper sliding block (11); A die sleeve (2) is arranged on the platform (12) of a press and located directly below the pressing end (32); The bottom of the movable cavity (41) is provided with a plurality of mounting holes (43), and the number of the mounting holes (43) is the same as that of the support adjusting assemblies (5); The support adjusting assembly (5) is arranged in the mounting hole (43); The support adjusting assembly (5) further comprises: A jacking cylinder (55) is arranged in the mounting hole (43), and the telescopic end of the jacking cylinder (55) is connected with the rolling member (53); When the movable end (31) is coaxially arranged with the mounting base (4), the distance D between the outer side wall of the movable end (31) and the cavity wall of the movable cavity (41) is 6mm-10mm; When the movable end (31) abuts against the bottom of the movable cavity (41), the distance d between the end face of the movable end (31) close to the upper sliding block (11) and the upper sliding block (11) is 16mm-20mm; When the punch (3) is inserted into the die sleeve (2), the support adjusting assembly (5) guides the punch (3) with the die sleeve (2) and flexibly adjusts the position of the punch (3).

3. The flexible positioning device according to claim 1 or 2, characterized in that, The rolling member (53) comprises a universal ball or a cow eye wheel.

4. The flexible positioning device according to claim 1 or 2, characterized in that, The ratio of D to d is 16:

37.

5. The flexible positioning device according to claim 1 or 2, characterized in that, The die cavity (21) of the die sleeve (2) is provided with a chamfer (22) at the cavity opening.

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