A process for machining a cartridge case with a continuous primer and an extractor groove

Abstract

The application discloses a kind of shell continuous drawing extrusion mouth processing technology, comprising the following steps: step S1: obtaining cup, and cup is heat treated and surface treated;Step S2: cup is sequentially conveyed to each station of multi-station punch press, to carry out at least three times drawing processing and extrusion mouth processing to cup, obtain shell semi-finished product after, carry out blanking;And, the deformation of the first drawing processing of cup is 78%-83%, the deformation of the second drawing processing is 41%-46%, the deformation of the third drawing processing is 27%-32%.The shell continuous drawing extrusion mouth processing provided by the present application reduces the intermediate heat treatment and surface treatment process in the prior art, reduces the amount of cleaning agent and the cost of sewage treatment, the appearance and size of the product after drawing and extrusion processing are qualified, and multiple shells can be processed at a time by one-time stamping, which improves production efficiency and is conducive to energy saving and environmental protection.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of shell processing methods, in particular to a shell continuous drawing and extruding mouth processing technology. BACKGROUND

[0002] In the field of shell processing, the shell is mostly a long and thin-walled product, which needs to be processed by multiple thinning and drawing processes. After the multiple drawing processes, the shell needs to be heat treated and surface treated before being processed again. The surface cleaning process includes pickling, alkaline washing, rinsing, saponification, and drying, which consumes a large amount of water and requires subsequent sewage treatment. The heat treatment also consumes a large amount of energy. At present, the state is increasing its efforts in energy conservation and environmental protection, and the requirements for sewage treatment are becoming more stringent. It is difficult to treat the sewage generated by the surface cleaning process, and measures are taken to limit the consumption of energy. Secondly, the surface of the product after surface treatment is prone to oxidation, and the surface quality is unstable, so it needs to be processed in a timely manner. During the drawing process, there are phenomena such as slagging and breaking, and after each drawing process, heat treatment and surface treatment are required. The production process is complicated, the production cost is high, and the pressure of energy conservation and environmental protection is great.

[0003] In the prior art, the drawing process flow of the shell before forming is as follows: blanking and punching cup → cup annealing → cup pickling, saponification, and drying (pickling, rinsing, saponification, and drying) → first drawing → first drawn shell annealing → first drawn shell pickling, saponification, and drying → second drawing → second drawn shell annealing → second drawn shell pickling, saponification → third drawing → third drawn shell alkaline washing, saponification, and drying (alkaline washing, rinsing, saponification, and drying) → cutting; the method in the prior art is complex and has low production efficiency.

[0004] Therefore, how to effectively improve the processing efficiency of the shell is a technical problem that needs to be solved by those skilled in the art at present. SUMMARY

[0005] The purpose of the present application is to provide a shell continuous drawing and extruding mouth processing technology, which can reduce the cost of cleaning agents and sewage treatment and save costs.

[0006] To achieve the above-mentioned purpose, the present application provides the following technical scheme:

[0007] A shell continuous drawing and extruding mouth processing technology, comprising the following steps:

[0008] Step S1: obtaining a cup and performing heat treatment and surface treatment on the cup;

[0009] Step S2: sequentially conveying the cup to each station of a multi-station punch to perform at least three times of drawing and extruding processing on the cup, and obtaining a shell semi-finished product, and then performing blanking;

[0010] And, the first drawing process of the cup has a deformation of 78%-83%, the second drawing process has a deformation of 41%-46%, and the third drawing process has a deformation of 27%-32%.

[0011] Preferably, the step S2 comprises:

[0012] Step S21: sequentially conveying each cup to a first station of a multi-station punch press, and performing a first drawing process on the cup;

[0013] Step S22: conveying the cup after the first drawing process to a second station of the multi-station punch press, and performing a second drawing process on the cup;

[0014] Step S23: conveying the cup after the second drawing process to a third station of the multi-station punch press, and performing a third drawing process on the cup;

[0015] Step S24: conveying the cup after the third drawing process to a fourth station of the multi-station punch press, and performing a mouth extruding process on the cup to obtain a shell semi-finished product, and performing blanking.

[0016] Preferably, the step S24 comprises:

[0017] The mouth extruding process of the cup is performed using a soap aqueous solution as a lubricant and a coolant, and the flow rate of the soap aqueous solution is 5-9 mL / s.

[0018] Preferably, the step of the first drawing process, the step of the second drawing process, and the step of the third drawing process are performed simultaneously.

[0019] Preferably, the step S21 further comprises:

[0020] The cup passes through a feeding funnel and a feeding pipe, and is conveyed to the first station by the feeding device.

[0021] Preferably, the step S1 comprises:

[0022] Blanking and punching the cup to obtain the cup;

[0023] Performing annealing treatment on the cup;

[0024] Performing pickling and saponization on the cup after annealing to remove the oxide layer on the surface of the cup and generate a saponification film.

[0025] Preferably, the step of blanking and punching the cup to obtain the cup comprises:

[0026] A double-action punch press and a composite die are used to punch the cup after shearing and blanking, and the cup is punched in the cup punching die of the composite die.

[0027] Preferably, the step of annealing the cup includes:

[0028] The annealing is performed by a spiral roller resistance furnace, and the hardness HV5 of the cup after annealing is 55-85.

[0029] Preferably, the method further comprises the steps of: completing the drawing process at the current station, and simultaneously conveying the cup in the previous station to the current station; and the intervals between the stations are the same.

[0030] Preferably, the deformation of the first drawing process refers to the change of the cross-sectional area of the cup at a position 0.8-0.9L0 from the bottom, the deformation of the second drawing process refers to the change of the cross-sectional area of the cup at a position 0.4-0.6L1 from the bottom, and the deformation of the third drawing process refers to the change of the cross-sectional area of the cup at a position 0.4-0.6L2 from the bottom, wherein L0 is the initial length of the cup, L1 is the length of the cup after the first drawing process, and L2 is the length of the cup after the second drawing process.

[0031] The shell continuous drawing and extruding mouth processing method provided by the application comprises the following steps: step S1: obtaining a cup and performing heat treatment and surface treatment on the cup; step S2: sequentially conveying the cup to each station of a multi-station punch to perform at least three drawing processes and extruding mouth processing on the cup, and obtaining a shell semi-finished product, and then performing blanking; and the deformation of the first drawing process on the cup is 78%-83%, the deformation of the second drawing process is 41%-46%, and the deformation of the third drawing process is 27%-32%. The shell continuous drawing and extruding mouth processing method provided by the application uses the multi-station punch to continuously draw the cup, and limits the deformation of a single drawing process, so that the cup can meet the size requirements and avoid drawing deformation in each drawing process. The multi-station continuous drawing and extruding mouth new equipment can complete all lengthening and cutting processes in one process, reduces the intermediate heat treatment and surface treatment processes in the prior art, reduces the amount of cleaning agent used and the cost of sewage treatment, and the appearance and size of the product after drawing and extruding are qualified. Moreover, one stamping can process multiple shells at the same time, improves the production efficiency, is conducive to energy saving and environmental protection, and has the advantages of high efficiency, low cost, and high quality.

[0032] In a preferred embodiment, the deformation amount of the first drawing process refers to the cross-sectional area change amount of the cup at a position 0.8-0.9L0 from the bottom, the deformation amount of the second drawing process refers to the cross-sectional area change amount of the cup at a position 0.4-0.6L1 from the bottom, and the deformation amount of the third drawing process refers to the cross-sectional area change amount of the cup at a position 0.4-0.6L2 from the bottom, wherein L0 is the initial length of the cup, L1 is the length of the cup after the first drawing process, and L2 is the length of the cup after the second drawing process. The above arrangement uses the cross-sectional area change of the cup as the basis for judging the deformation amount, which has high precision. At the same time, by limiting the maximum cross-sectional area change amount of the cup during each drawing process as the deformation amount index of the cup, the consistency of the deformation amount judgment during each drawing process is further ensured, thereby ensuring the uniformity of the processing size of each cup. BRIEF DESCRIPTION OF DRAWINGS

[0033] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor based on these drawings.

[0034] Figure 1 Flow chart of the process of the cartridge continuous drawing and extrusion port processing technology according to one embodiment of the present application;

[0035] Figure 2 Flow chart of the process of the cartridge continuous drawing and extrusion port processing technology according to another embodiment of the present application. EMBODIMENT

[0036] The core of the present application is to provide a cartridge continuous drawing and extrusion port processing technology, which can improve processing efficiency, save cost and reduce pollution.

[0037] In order to make the person skilled in the art better understand the present application, the present application will be further described in detail below in combination with the drawings and specific embodiments.

[0038] Please refer to Figure 1 and Figure 2 , Figure 1 Flow chart of the process of the cartridge continuous drawing and extrusion port processing technology according to one embodiment of the present application; Figure 2 Flow chart of the process of the cartridge continuous drawing and extrusion port processing technology according to another embodiment of the present application.

[0039] In this embodiment, the cartridge continuous drawing and extrusion port processing technology comprises the following steps:

[0040] Step S1: obtaining a cup, and performing heat treatment and surface treatment on the cup;

[0041] Step S2: sequentially conveying the cup to each station of a multi-station punch press to perform at least three times of drawing and necking on the cup, and after obtaining the shell semi-product, performing blanking;

[0042] And the deformation of the first drawing of the cup is 78%-83%, the deformation of the second drawing is 41%-46%, and the deformation of the third drawing is 27%-32%.

[0043] Specifically, in step S1, the blank is first processed into a cup, and after heat treatment and surface treatment, the shell semi-product can be obtained by continuously drawing and necking the cup. The heat treatment, i.e. annealing treatment, is preferably performed by a spiral roller type resistance furnace, and the surface treatment includes pickling, rinsing, saponification, and drying. Since a multi-station punch press is used, multiple cups can be processed simultaneously, and a single cup can be gradually moved from the first station to the fourth station under the action of the conveying device to complete the entire processing process. Moreover, if the deformation degree of the cup is too small, it will not be able to be drawn to the designed length, and more than three times of drawing will be required, which is high in cost and low in efficiency, and work hardening will be more obvious during this process, which is not conducive to subsequent continuous drawing. If the deformation degree is too large, the cup product will be broken during drawing, so the deformation degree of each station needs to be reasonably allocated. Specifically, since the wall thickness of the cup is thick during the first drawing, and the hardness of the shell cup is low after heat treatment and annealing, a larger deformation degree is used, and the deformation of the first drawing is preferably 78%-83%. During the second drawing, the cup product is thinned, and to avoid deformation, the deformation degree during the second drawing can be appropriately reduced, and the deformation of the second drawing is preferably 41%-46%. During the third drawing, the wall thickness of the cup product is very small, and work hardening occurs after two times of drawing, so a smaller deformation degree is selected to avoid cup breakage, and the deformation of the third drawing is preferably 27%-32%.

[0044] The shell continuous drawing and mouth extruding processing technology provided by the application adopts the multi-station punch to continuously draw the shell, and by limiting the deformation amount in single drawing processing, the shell can realize the size requirement and avoid drawing deformation in each drawing processing procedure. The multi-station continuous drawing and mouth extruding new equipment can complete all lengthening and cutting procedures in one procedure, reduces the intermediate heat treatment and surface treatment procedures in the prior art, reduces the use amount of cleaning agent and the cost of sewage treatment, and the appearance and size of the product after drawing and mouth extruding processing are qualified. One-time stamping can process multiple shells at the same time, improves the production efficiency, and is conducive to energy saving and environmental protection.

[0045] In some embodiments, the step S2 comprises:

[0046] Step S21: sequentially conveying each of the shells to the first station of the multi-station punch and performing first drawing processing on the shells;

[0047] Step S22: conveying the shells after the first drawing processing to the second station of the multi-station punch and performing second drawing processing on the shells;

[0048] Step S23: conveying the shells after the second drawing processing to the third station of the multi-station punch and performing third drawing processing on the shells;

[0049] Step S24: conveying the shells after the third drawing processing to the fourth station of the multi-station punch and performing mouth extruding processing on the shells to obtain shell semi-finished products, and discharging.

[0050] Further, the step of conveying the shells in the previous station to the current station at the same time as conveying the shells after the drawing processing in the current station to the next station is further included. That is, the step S2 comprises:

[0051] Step S21: sequentially conveying each of the shells to the first station of the multi-station punch and performing first drawing processing on the shells;

[0052] Step S22: conveying the shells after the first drawing processing to the second station of the multi-station punch and performing second drawing processing on the shells; at the same time, conveying new shells to the first station of the multi-station punch and performing first drawing processing on the shells in the first station;

[0053] Step S23: conveying the cup subjected to the second drawing process to the third station of the multi-station punch press, and performing a third drawing process on the cup; at the same time, conveying the cup subjected to the first drawing process to the second station of the multi-station punch press, and performing a second drawing process on the cup in the second station;

[0054] Step S24: conveying the cup subjected to the third drawing process to the fourth station of the multi-station punch press, and performing a mouth extruding process on the cup to obtain a shell semi-product, and performing blanking; at the same time, conveying the cup subjected to the second drawing process to the third station of the multi-station punch press, and performing a third drawing process on the cup. That is, the first drawing process, the second drawing process and the third drawing process are performed simultaneously. That is, the conveying action of the cup in each station can be performed synchronously, and the drawing process and the mouth extruding process can also be performed synchronously, so as to improve the processing efficiency of the shell.

[0055] In some embodiments, the step S24 comprises:

[0056] The mouth extruding process is performed on the cup by using a soap solution as a lubricant and a coolant, and the flow rate of the soap solution is 5-9 mL / s. Specifically, stable soap solution is needed for lubrication and cooling during the processing of each station; if the frictional resistance is unbalanced during the drawing process of the cup, uneven deformation will occur, and the processed cup part will be skewed; the deformation resistance will increase, and cracks and shell breakage will easily occur; the tool will be easily worn, and the product will have line marks. Therefore, under good lubrication conditions, the drawing and mouth extruding processes are stable, and the product has a high qualification rate. Therefore, the soap solution with a solution ratio of 8-15 g / L and a flow rate of 7 mL / s is preferably used for lubrication.

[0057] In some embodiments, the step S21 further comprises:

[0058] The cup is conveyed to the first station through the feeding funnel and the feeding pipe and by the feeding device, and the feeding device can sequentially drive the cup to the first station.

[0059] In some embodiments, the steps S21 to S23 all comprise: performing a drawing process on the cup by using a punch die, and resetting the punch of the punch die before completing the current drawing process and entering the next station, and using a conveying device to send the cup to the next station, so that automatic feeding, drawing and mouth extruding processes can be realized.

[0060] In some embodiments, the step S1 comprises:

[0061] Blanking and punching the cup to obtain the cup;

[0062] annealing treatment is performed on the cup;

[0063] After the annealing treatment, the cup is subjected to pickling and saponification to remove the oxide layer on the surface of the cup and generate a saponified film, thereby reducing deformation and cracking during the drawing process.

[0064] In some embodiments, the step of blanking and cupping the cup includes:

[0065] The double-action punch and the compound die are used to cut the blank and then the cupping die in the compound die is used to cup the cup. Specifically, the double-action punch can be used to simultaneously cut and cup the cup, which is convenient for processing. The compound die includes a cutting die and a cupping die, and the compound die is installed on the double-action punch, which can improve the processing efficiency of the cup.

[0066] In some embodiments, the step of performing annealing treatment on the cup includes:

[0067] The spiral roller resistance furnace is used for annealing, and the hardness HV5 of the cup after annealing is 55-85, which facilitates the subsequent drawing process.

[0068] In some embodiments, the deformation amount of the first drawing process refers to the change amount of the cross-sectional area of the cup at a position 0.8-0.9L0 from the bottom, the deformation amount of the second drawing process refers to the change amount of the cross-sectional area of the cup at a position 0.4-0.6L1 from the bottom, and the deformation amount of the third drawing process refers to the change amount of the cross-sectional area of the cup at a position 0.4-0.6L2 from the bottom, where L0 is the initial length of the cup, L1 is the length of the cup after the first drawing process, and L2 is the length of the cup after the second drawing process. The above setting uses the change of the cross-sectional area of the cup as the basis for judging the deformation amount, which has high precision. At the same time, by limiting the maximum change amount of the cross-sectional area of the cup during each drawing process as the deformation amount index, the consistency of the deformation amount judgment during each drawing process is ensured, thereby ensuring the uniformity of the processing size of each cup. That is, the maximum change amount of the cross-sectional area of the cup during the first drawing process is located at a position 0.8-0.9L0 from the bottom, the maximum change amount of the cross-sectional area of the cup during the second drawing process is located at a position 0.4-0.6L1 from the bottom, and the maximum change amount of the cross-sectional area of the cup during the third drawing process is located at a position 0.4-0.6L2 from the bottom. It should be noted that the sizes of L0, L1 and L2 can be set according to the initial length of the cup and the deformation amount of each drawing process, and the height of the punch in the cupping die is determined by the height of the cup set in the corresponding station.

[0069] Specifically, the distance between each work station of the multi-station punch press is equal, the feeding device feeds one processing work station during the stamping gap process of the stamping die, i.e. the shell cup is automatically pushed out and transferred to the next work station by the feeding device after the processing of each work station is completed.

[0070] The shell continuous drawing and necking machining process can complete all drawing and necking processes in one process by using the new multi-station continuous drawing and necking device, and the product appearance and size after continuous drawing and necking are qualified without intermediate heat treatment (annealing) and surface treatment (pickling, rinsing, saponification and drying) processes. Two annealing processes, three machining processes and three surface treatment processes are reduced, four shells can be processed at the same time in one stamping, the production efficiency is improved, and energy saving and environmental protection are facilitated.

[0071] The shell continuous drawing and necking machining process provided by the present application is described in detail above. The principles and implementation modes of the present application are described by applying specific examples in this paper, and the above examples are only used to help understand the method of the present application and its core idea. It should be pointed out that for ordinary skilled persons in the technical field, some improvements and modifications can be made to the present application without departing from the principles of the present application, and these improvements and modifications also fall within the protection scope of the claims of the present application.

Claims

1. A process for machining a pull ring and a neck finish of a bottle, characterized in that, The method comprises the following steps: Step S1: obtaining a cup and performing heat treatment and surface treatment on the cup; Step S2: sequentially conveying the cup to each station of a multi-station punch press to perform at least three times of drawing processing and mouth extruding processing on the cup, obtaining a shell semi-product, and then discharging; The deformation of the first drawing processing refers to the change of the cross-sectional area of the cup at a position 0.8-0.9L0 from the bottom, the deformation of the second drawing processing refers to the change of the cross-sectional area of the cup at a position 0.4-0.6L1 from the bottom, and the deformation of the third drawing processing refers to the change of the cross-sectional area of the cup at a position 0.4-0.6L2 from the bottom, wherein L0 is the initial length of the cup, L1 is the length of the cup after the first drawing processing, and L2 is the length of the cup after the second drawing processing; The step S2 comprises: Step S21: sequentially conveying each cup to the first station of the multi-station punch press and performing the first drawing processing on the cup; Step S22: conveying the cup after the first drawing processing to the second station of the multi-station punch press and performing the second drawing processing on the cup; Step S23: conveying the cup after the second drawing processing to the third station of the multi-station punch press and performing the third drawing processing on the cup; Step S24: conveying the cup after the third drawing processing to the fourth station of the multi-station punch press, performing the mouth extruding processing on the cup, obtaining a shell semi-product, and discharging; The step further comprises: simultaneously conveying the cup in the previous station to the current station while the drawing processing in the current station is completed, and the spacing between each station is the same; The first drawing processing, the second drawing processing and the third drawing processing are simultaneously performed; The step S1 comprises: Discharging and punching the cup to obtain the cup; Performing annealing treatment on the cup; Performing pickling and saponification on the cup after annealing to remove the oxide layer on the surface of the cup and generate a layer of saponified film; The step of discharging and punching the cup to obtain the cup comprises: Using a double-action punch press and a composite die, the cup is punched after shearing and falling into the cup punching die of the composite die; the composite die comprises a shearing die and a cup punching die, and the composite die is installed on the double-action punch press.

2. The process of claim 1 wherein, The step S24 comprises: Using a soap water solution as a lubricant and a coolant to perform the mouth extruding processing on the cup, and the flow rate of the soap water solution is 5-9 mL / s.

3. The process of claim 1 wherein, The step S21 further comprises: Conveying the cup to the first station through the feeding funnel, the feeding pipe and the feeding device.

4. The process of claim 1 wherein, The step of performing annealing treatment on the cup comprises: Using a spiral roller type resistance furnace for annealing, and the hardness HV5 of the cup after annealing is 55-85.

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