CN109994750A - Guide plug for assisting steel shell notch - Google Patents
Guide plug for assisting steel shell notch Download PDFInfo
- Publication number
- CN109994750A CN109994750A CN201910367390.9A CN201910367390A CN109994750A CN 109994750 A CN109994750 A CN 109994750A CN 201910367390 A CN201910367390 A CN 201910367390A CN 109994750 A CN109994750 A CN 109994750A
- Authority
- CN
- China
- Prior art keywords
- steel shell
- section
- guide
- cut
- steel
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 143
- 239000010959 steel Substances 0.000 title claims abstract description 143
- 238000000034 method Methods 0.000 abstract description 19
- 230000010355 oscillation Effects 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 10
- 230000008569 process Effects 0.000 description 10
- 241000270666 Testudines Species 0.000 description 8
- 230000009471 action Effects 0.000 description 3
- WJZHMLNIAZSFDO-UHFFFAOYSA-N manganese zinc Chemical compound [Mn].[Zn] WJZHMLNIAZSFDO-UHFFFAOYSA-N 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 241000251468 Actinopterygii Species 0.000 description 1
- 241000201297 Chelone Species 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- SZKTYYIADWRVSA-UHFFFAOYSA-N zinc manganese(2+) oxygen(2-) Chemical compound [O--].[O--].[Mn++].[Zn++] SZKTYYIADWRVSA-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/10—Primary casings, jackets or wrappings of a single cell or a single battery
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M6/00—Primary cells; Manufacture thereof
- H01M6/005—Devices for making primary cells
Abstract
The invention provides a guide plug for assisting a steel shell to be notched, which is used for notching the steel shell to be notched, and comprises a supporting part for supporting a notching upper die, an open end guide section abutting against the inner wall of the open end of the steel shell to be notched, and a body guide section extending into the body of the steel shell to be notched; the bottom of the body guide section is provided with a body limiting section which is propped against the inner wall of the head of the steel shell to be cut. Lead the stopper by open end direction section and offset with the open end inner wall of waiting to cut steel casing, body direction section stretches into the inherent incision in-process of body and corrects the steel casing position, the bottom of body direction section sets up the spacing section of body, therefore the incision in-process, support tightly spacing to steel casing open end and steel casing head simultaneously by open end direction section and the spacing section of body, improve the guide stopper and the straightness that hangs down of waiting to cut steel casing, reduce the amplitude of oscillation of steel casing, reduce the swing offset of incision position, thereby reduce the shoulder height difference of steel casing behind the incision, improve the incision quality of steel casing.
Description
Technical Field
The invention relates to the technical field of batteries, in particular to a guide plug for assisting a steel shell notch.
Background
The last process after the steel shell of the alkaline zinc-manganese battery is formed is a notching process which is used for separating the steel shell from a scrap head. As shown in fig. 1-1 and fig. 1-2, fig. 1-1 is a schematic structural diagram of a steel case of an alkaline zinc-manganese dioxide battery after being formed; fig. 1-2 are schematic views of the cutting structure of the scrap head and the steel shell after the battery steel shell is cut and separated. After the battery steel shell is formed, the scrap head 11 'at the top of the battery steel shell needs to be cut and separated from the steel shell 12'. As shown in fig. 2, fig. 2 is a schematic structural diagram of the cut steel shell. The steel shell 12 ' is a hollow cylinder composed of a closed positive terminal 21 ', a cylindrical body 22 ' and an open end 23 ', and the steel shell needs to ensure the consistency of the circumferential shoulder height 24 ' for ensuring the structural stability, so that the shoulder height difference needs to be ensured to be stabilized in a smaller range.
In the prior art, a method for fixing the steel shell through a guide plug to perform notching is commonly adopted in a notching process of the molded steel shell, the form of the guide plug is shown in fig. 3, and fig. 3 is a schematic structural diagram of the guide plug. The guide plug 3 'is a stepped cylindrical part composed of a fixed end 31', an open end guide section 32 ', and a body guide section 33'.
The notching process of forming the steel shell comprises four steps, as shown in fig. 4-1 to 4-4, and fig. 4-1 is a schematic layout structure diagram of the initial stage of notching the steel shell. The guide plug 41 is fixedly arranged on the notch die handle 43 through a fixing screw 42, a notch upper die 44 is sleeved between the guide plug 41 and the notch die handle 43, the guide plug 41 is plugged into the steel shell 45 to be notched, and the upper cutting edge 47 of the notch upper die 44 abuts against the inner wall of the steel shell 45 to be notched. During notching, the outer wall of the steel shell 45 to be notched extends into the notching lower die 46, and the lower cutting edge 48 of the notching lower die 46 is propped against the outer wall of the steel shell 45 to be notched. During notching, the central axes of the notching upper die 44, the steel shell to be notched 45 and the notching lower die 46 are required to be approximately overlapped.
Fig. 4-2 is a schematic diagram of the arrangement structure of the preparation stage of the steel shell notch. The notch upper die 46 descends, the guide plug 41 enters the steel shell 45 to be notched, the steel shell is guided under the action of each guide section of the guide plug 41, and the central axes of the notch upper die 46, the steel shell 45 to be notched and the notch lower die 46 are basically overlapped.
Fig. 4-3 is a schematic view of the notch stage arrangement of the steel shell notch. The upper notching die 44 continues to move downwards to push the steel shell 45 to be notched into the lower notching die 46, the steel shell and the scrap head are separated under the interaction of the upper cutting edge 47 and the lower cutting edge 48 of the lower notching die 46 in the process that the upper notch enters the lower notching die 46, fig. 4-4 are schematic diagrams of the arrangement structure of the notching device after the scrap head is cut from the steel shell, the upper notching die 44 continues to move downwards, and the steel shell is separated from the scrap head, so that the notching purpose is achieved.
It can be seen from the above notching process that, in order to ensure the notching quality, the shoulder height difference of the steel shell is stabilized in a small range, and the central axes of the notching upper die, the steel shell to be notched and the notching lower die are basically coincided in the notching process, that is, under the action of the guide plug, the notching action of the steel shell to be notched in a vertical state becomes a key.
In order to avoid the phenomenon that the guide sections of the guide plug abrade the inner wall of the steel shell when the guide plug enters the steel shell to be cut, the outer diameter of the guide section at the opening end is usually slightly smaller than the outer diameter 25 'of the opening end during design and processing, and the outer diameter of the guide section of the body is usually slightly smaller than the inner diameter 26' of the body during design and processing. That is, when the guide plug works, a gap exists between the guide plug and the inner wall of the steel shell, and meanwhile, the outer diameter 27 'of the notch of the steel shell is required to be larger than the outer diameter 28' of the opening end after the notch is cut, so that the designed and processed inner diameter of the lower die of the notch must be larger than the outer diameter of the opening end of the steel shell. The steel shell to be cut is difficult to cut in a vertical state due to the two reasons, so that the steel shell after being cut has a large shoulder height difference which is more than 0.05mm in a normal condition, and the steel shell with a large outer diameter at the opening part has the shoulder height difference which is more than 0.1mm.
Therefore, how to improve the stability of the steel shell notch quality is a problem to be solved urgently by those skilled in the art.
Disclosure of Invention
In view of this, the invention provides a guide plug for assisting the steel shell notch, so as to improve the stability of the steel shell notch quality.
In order to achieve the purpose, the invention provides the following technical scheme:
a guide plug for assisting the steel shell to be cut is used for cutting a steel shell to be cut, and comprises a supporting part for supporting a cutting upper die, an opening end guide section which is abutted against the inner wall of the opening end of the steel shell to be cut, and a body guide section which extends into a body of the steel shell to be cut; the bottom of body direction section set up with the body spacing section that the head inner wall of waiting to cut steel casing offseted.
Preferably, in the above guide plug for assisting the steel shell notch, a guide height of the guide plug is a total length of the open end guide section, the body guide section and the body limiting section, and the guide height is equal to an inner shoulder height of the steel shell to be notch.
Preferably, in the above-mentioned guide plug for assisting the steel shell notch, the body limiting section is a limiting column of a cylindrical structure with an outer diameter smaller than the inner diameter of the body.
Preferably, in the above-mentioned guide plug for assisting the steel shell notch, the barrel body limiting section is a limiting sleeve whose bottom abuts against the inner wall of the head of the steel shell to be notch.
Preferably, in the above-mentioned guide plug for assisting the steel shell notch, the body limiting section and the body guiding section are of an integrated structure.
Preferably, in the guide plug for assisting the steel shell notch, a screw mounting hole is formed in the guide plug along the radial direction of the guide plug, and a sinking groove which is coaxially arranged with the screw mounting hole and accommodates the head of the screw is formed at the bottom of the body guide section.
The guide plug for assisting the steel shell to be notched is used for notching the steel shell to be notched, and comprises a supporting part for supporting a notching upper die, an opening end guide section which is abutted against the inner wall of the opening end of the steel shell to be notched, and a body guide section which extends into the body of the steel shell to be notched; the bottom setting of body direction section and the spacing section of body that the head inner wall of waiting to cut steel casing offseted. Lead the stopper and pass through the supporting part and connect the mould on the incision, at the incision during operation, by open end direction section with wait the open end inner wall counterbalance of incision steel casing, the body direction section stretches into the inherent incision in-process of body and corrects the steel casing position, the bottom of body direction section sets up the spacing section of body, it offsets with the head inner wall of waiting to cut the steel casing, consequently, the incision in-process, it is spacing to support tightly steel casing open end and steel casing head simultaneously by open end direction section and the spacing section of body, improve the plug and the straightness that hangs down of waiting to cut the steel casing, reduce the amplitude of oscillation of steel casing, reduce the swing offset of incision position, thereby reduce the shoulder height difference of steel casing behind the incision, improve the incision quality of steel casing.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1-1 is a schematic view of the steel shell structure of an alkaline zinc-manganese battery after molding;
FIGS. 1-2 are schematic views showing the cutting structure of the scrap and the steel case after the battery steel case is cut and separated;
FIG. 2 is a schematic structural diagram of the cut steel shell;
FIG. 3 is a schematic structural view of a plug;
FIG. 4-1 is a schematic view of the arrangement structure of the steel shell notch in the initial stage;
FIG. 4-2 is a schematic diagram of the arrangement of the preparation stage of the steel shell notch;
4-3 are schematic views of the notch stage arrangement of the steel shell notch;
4-4 are schematic views of the arrangement of the notching device after the scrap head is cut from the steel shell;
FIG. 5 is a schematic structural diagram of a guide plug for assisting a steel shell notch provided by the invention;
fig. 6 is a schematic view of the guide plug assembly of the auxiliary steel shell notch in fig. 5.
Detailed Description
The invention discloses a guide plug for assisting a steel shell notch, which improves the stability of the steel shell notch quality.
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 5 and 6, fig. 5 is a schematic structural diagram of a guide plug for assisting steel shell cutting provided by the present invention; fig. 6 is a schematic view of the guide plug assembly of the auxiliary steel shell notch in fig. 5.
The invention provides a guide plug for assisting a steel shell to be cut, which is used for cutting a steel shell to be cut, wherein the guide plug 5 comprises a supporting part 51 for supporting a cutting upper die, an opening end guide section 52 abutting against the inner wall of the opening end of the steel shell to be cut, and a body guide section 53 extending into a body of the steel shell to be cut; the bottom of the body guide section 53 is provided with a body limiting section 531 which is abutted against the inner wall of the head of the steel shell to be cut. Lead stopper 5 and pass through supporting part 51 and connect mould 6 on the incision, at the incision during operation, by open end direction section 53 with wait to cut open end inner wall of steel-shelled turtle 7 and offset, body direction section 53 stretches into the inherent incision in-process of body and corrects the steel-shelled turtle position, the bottom of body direction section 53 sets up body spacing section 531, it offsets with the head inner wall of waiting to cut open steel-shelled turtle 7, consequently, the incision in-process, it is spacing to support tight simultaneously steel-shelled turtle open end and steel-shelled turtle head by open end direction section 52 and body spacing section 531, improve lead stopper 5 and the straightness that hangs down of waiting to cut open steel-shelled turtle 7, reduce the swing range of steel-shelled turtle, reduce the swing offset of incision position, thereby reduce the shoulder height difference of steel-shelled turtle behind the incision, improve the incision quality of steel-shelled turtle.
In an embodiment of the present disclosure, the guiding height 54 of the guiding plug 5 is the total length of the open end guiding section 52, the body guiding section 53 and the body limiting section, and the guiding height 54 is equal to the height of the inner shoulder of the steel shell 7 to be cut. Referring to fig. 2, when the guide plug 5 is used, the supporting part 51 supports the notch upper die 6 and the notch die handle 8, the guide plug 5 is sent into the steel shell 7 to be notched through the notch die handle 8, and the upper cutting edge of the notch upper die 6 cuts the connecting position of the steel shell and the scrap head in the notch process. Because the guide plug 5 stretches into the steel shell, the guide length 54 of the guide plug 5 needs to be controlled, and the phenomenon that the upper cutting edge cannot normally cut after the body limiting section 531 abuts against the inner wall of the head of the steel shell is avoided. The guide length 54 of the guide plug 5 is the total length of the opening end guide section 52, the body guide section 54 and the body limiting section 531, and the guide length 54 is prevented from being too long or too short, so that the notch cannot be effectively cut if the guide length is too long, and the purpose of ensuring the perpendicularity of the steel shell cannot be achieved if the guide length is too short.
In this embodiment, the guide height 54 is controlled to be equal to the height of the inner shoulder 29' of the steel shell 7 to be cut. The shoulder 24' is the target height of the steel shell after notching, from the top of the steel shell after notching to the height of the outer wall of the head thereof, for the steel shell to be notched. The inner shoulder height 29 'is the height of the inner side of the steel shell, and is equal to the difference between the head wall thickness 30' of the shoulder height of the steel shell except the head inner wall from the head inner wall of the steel shell to the top of the steel shell. As in fig. 2, the inner shoulder height 29 ' = shoulder height 24 ' — head wall thickness 30 '. By controlling the guide height 54 of the guide plug 5, the position where the upper cutting edge of the upper die 6 of the notch abuts against the inner wall of the steel shell 7 to be cut after the guide plug 5 extends into the steel shell 7 to be cut is the target shoulder height of the formed steel shell; simultaneously, also guaranteed the incision in-process, lead the stopper and offset with the box hat head and open end inner wall simultaneously, furthest has guaranteed the straightness that hangs down of waiting to cut the mouth box hat in the incision process.
In one embodiment of the present disclosure, the barrel limiting section 531 is a cylindrical limiting column with an outer diameter smaller than the inner diameter of the barrel. Lead stopper 5 and stretch into the internal diameter of treating the body section of incision steel casing 7, be less than the body internal diameter of treating the incision steel casing to avoid the incision in-process to treat wearing and tearing, the fish tail of incision steel casing inner wall, also do benefit to behind the incision simultaneously and lead the smooth taking out in the stopper steel casing behind the incision by the incision. Because the spacing end of body is located the bottom of body direction section to stretch into the head of waiting to cut steel casing, consequently by its the convenience of taking out that needs control the spacing section of body, the external diameter of the spacing section of body is less than the steel casing body internal diameter, and sets up to the spacing post of cylinder structure, guarantees to laminate with head inner wall plane, easily guarantees to hang down straightness.
Certainly, the body limiting section can be arranged to be a polygonal structure, so that the connection stability between the body limiting section and the body guiding section is required to be ensured, and a clamping space for fixing the head of the screw in the guide plug is reserved.
In an embodiment of the present disclosure, the body limiting section is a limiting sleeve whose bottom abuts against an inner wall of the head of the steel shell to be cut. The fixing screw of the guide plug is arranged from the bottom of the guide plug and is connected with the notch die handle to connect and lock the notch upper die. The head of fixed screw is located the bottom of leading the stopper, for the convenience of the stability of being connected of the spacing section of body and the body direction section, sets up the spacing section of body into spacing sleeve, sets up the through-hole of holding fixed screw head in the spacing sleeve, and the spacing section of body is connected with the mode that body direction section accessible screw thread or clamped and is locked.
In a preferred embodiment of the present invention, the body limiting section 531 and the body guiding section 53 are integrally formed. The spacing section of body is body direction section structure as an organic whole, adds man-hour, and the height of direct processing body direction section 53 can stretch into in waiting to cut steel shell 7 and support tightly with steel shell head inner wall, utilizes processing on the one hand, avoids increasing a plurality of parts and influences the high control degree of difficulty of guide plug, and a body structure is convenient for process simultaneously, but one shot forming reduces the processing degree of difficulty.
In an embodiment of the present invention, the guide plug 5 has a screw mounting hole 55 formed therein along a radial direction thereof, and the body guide section 53 has a bottom portion formed with a countersunk groove 55 coaxially disposed with the screw mounting hole 55 and receiving a head portion of the screw. Lead stopper 5 and incision die shank 8 and be connected through set screw 9, set screw mounting hole 55 in leading stopper 5, body direction section 53 is seted up heavy groove 56 along its radial by its bottom, and set screw 9 can be packed into by leading the stopper bottom, and the head of set screw 9 falls into heavy inslot, avoids leading the interference of stopper bottom support plane.
It should be noted that the integral body guiding section 53 and the body limiting section 531 are described as separate components for convenience of description, and the two are integral. For the guiding height, the body guiding section 53 and the body limiting section 531 do not affect the expression that the guiding height is the same as the shoulder height in the steel shell due to different indication positions.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (6)
1. The guide plug for assisting the steel shell to be cut is used for cutting the steel shell to be cut and is characterized by comprising a supporting part for supporting a cutting upper die, an opening end guide section which is abutted against the inner wall of the opening end of the steel shell to be cut and a body guide section which extends into a body of the steel shell to be cut; the bottom of the body guide section is provided with a body limiting section which is abutted against the inner wall of the head of the steel shell to be cut.
2. The guide plug for assisting steel shell cutting according to claim 1, wherein the guide plug has a guide height equal to the height of the inner shoulder of the steel shell to be cut, and the guide height is the total length of the open end guide section, the body guide section and the body limiting section.
3. The guide plug for assisting steel shell cutting according to claim 1, wherein the body limiting section is a cylindrical limiting column with an outer diameter smaller than an inner diameter of the body.
4. The guide plug for assisting steel shell cutting according to claim 3, wherein the body limiting section is a limiting sleeve with a bottom abutting against the inner wall of the head of the steel shell to be cut.
5. The guide plug for assisting steel shell cutting according to claim 4, wherein the body limiting section and the body guiding section are of an integrated structure.
6. The guide plug for assisting the steel shell notch according to claim 5, wherein a screw mounting hole is formed in the guide plug along a radial direction of the guide plug, and a sinking groove which is coaxially arranged with the screw mounting hole and accommodates a screw head is formed at the bottom of the body guide section.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910367390.9A CN109994750A (en) | 2019-05-05 | 2019-05-05 | Guide plug for assisting steel shell notch |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910367390.9A CN109994750A (en) | 2019-05-05 | 2019-05-05 | Guide plug for assisting steel shell notch |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109994750A true CN109994750A (en) | 2019-07-09 |
Family
ID=67136018
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910367390.9A Pending CN109994750A (en) | 2019-05-05 | 2019-05-05 | Guide plug for assisting steel shell notch |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109994750A (en) |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101197432A (en) * | 2007-11-16 | 2008-06-11 | 广东正龙股份有限公司 | Battery differential thickness steel shell and production process thereof |
| CN102125958A (en) * | 2011-01-24 | 2011-07-20 | 宁波光华电池有限公司 | Draw punch for moulding steel shell |
| CN203380249U (en) * | 2013-07-22 | 2014-01-08 | 倪志华 | Automatic notching die for battery cases |
| CN103531728A (en) * | 2013-10-16 | 2014-01-22 | 宁波光华电池有限公司 | Steel shell of alkaline zinc-manganese battery and production process thereof |
| CN104353719A (en) * | 2014-10-14 | 2015-02-18 | 无锡市金杨新型电源有限公司 | Notching machine of battery case |
| CN108340021A (en) * | 2017-01-22 | 2018-07-31 | 江苏金阳光新能源科技有限公司 | A kind of cylindrical lithium ion battery box hat bottom rapid cutting device and cutting method |
| CN208437471U (en) * | 2018-06-29 | 2019-01-29 | 无锡金杨丸伊电子有限公司 | A kind of battery case louvered die |
| CN209658304U (en) * | 2019-05-05 | 2019-11-19 | 宁波光华电池有限公司 | Guide plug for assisting steel shell notch |
-
2019
- 2019-05-05 CN CN201910367390.9A patent/CN109994750A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101197432A (en) * | 2007-11-16 | 2008-06-11 | 广东正龙股份有限公司 | Battery differential thickness steel shell and production process thereof |
| CN102125958A (en) * | 2011-01-24 | 2011-07-20 | 宁波光华电池有限公司 | Draw punch for moulding steel shell |
| CN203380249U (en) * | 2013-07-22 | 2014-01-08 | 倪志华 | Automatic notching die for battery cases |
| CN103531728A (en) * | 2013-10-16 | 2014-01-22 | 宁波光华电池有限公司 | Steel shell of alkaline zinc-manganese battery and production process thereof |
| CN104353719A (en) * | 2014-10-14 | 2015-02-18 | 无锡市金杨新型电源有限公司 | Notching machine of battery case |
| CN108340021A (en) * | 2017-01-22 | 2018-07-31 | 江苏金阳光新能源科技有限公司 | A kind of cylindrical lithium ion battery box hat bottom rapid cutting device and cutting method |
| CN208437471U (en) * | 2018-06-29 | 2019-01-29 | 无锡金杨丸伊电子有限公司 | A kind of battery case louvered die |
| CN209658304U (en) * | 2019-05-05 | 2019-11-19 | 宁波光华电池有限公司 | Guide plug for assisting steel shell notch |
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