Metal can tooth expansion die

Abstract

The utility model discloses a metal can expansion tooth mould which comprises a fixing seat, an outer sleeve, a mould seat, a plurality of tooth inner moulds, a plurality of tooth outer moulds, a tightening taper sleeve, a can guide block and a cover plate, the tightening taper sleeve is installed on the mould seat, a circular truncated cone mould head is located in the tightening taper sleeve, and the inner wall of the tightening taper sleeve is an annular inclined face gradually inclining outwards from top to bottom. The outer side surface of each tooth outer mold is connected with the outer sleeve through a corresponding locking bolt, and an elastic reset piece is arranged between every two tooth inner molds; the annular inclined face is in sliding fit with the outer side face of each tooth outer die, the peripheral face of the circular truncated cone die head is in sliding fit with the inner side face of each tooth inner die, the outer side face of each tooth inner die is provided with a threaded protruding strip, the inner side face of each tooth outer die is provided with a strip-shaped groove matched with the corresponding threaded protruding strip, and the can guide block is installed on the lower end face of the circular truncated cone die head. The cover plate is installed on the edge of the lower end opening of the outer sleeve, the center of the cover plate is provided with a can inlet allowing the opening of the metal can to enter and exit, the can inlet is communicated with the can inlet gap, and the can guide block is located in the can inlet.

Description

Technical Field

[0001] The utility model relates to the technical field of metal can making equipment, in particular to a metal can expansion die. Background Art

[0002] The metal body of an existing metal can is generally formed by bending a piece of can-making iron sheet into a cylindrical shape, and then performing resistance welding at the ends to form a cylindrical metal can body. Then, a plurality of external threads are processed on the outer edge of the opening of the metal can by using a can mouth screw thread forming die, so that the opening of the metal can matches the metal cover thread, thereby increasing the sealing performance between the metal can and the metal cover. For example, the Chinese utility model patent with authorization announcement number CN208790141U discloses a special-shaped can with a screw mouth. By setting an intermittent screw mouth on the upper neck of the can body, a reliable secondary seal can be formed between the can cover and the can body, thereby extending the shelf life of the food in the can. At present, the screw threads on the can mouth are generally formed by rolling the inner and outer molds. The intermittent screw threads need to be rolled multiple times, resulting in low production efficiency of threaded cans with intermittent screw threads. Utility Model Content

[0003] The problem to be solved by the utility model is to provide a metal can expansion die, which can accurately position the opening thread of the metal can and form it in one go, thereby improving production efficiency and product quality.

[0004] In order to solve the above technical problems, the technical solutions adopted by the present invention are as follows:

[0005] A metal can expansion die, comprising a fixed seat, an outer sleeve, a die base, a plurality of inner teeth molds and a plurality of outer teeth molds, the inner teeth molds and the outer teeth molds are the same in number and correspond one to one; the outer sleeve is mounted on the fixed seat, the die base is movably mounted in the outer sleeve and can move up and down in the outer sleeve, and a round cone die head with a larger upper part and a smaller lower part is provided in the center of the die base; it is characterized in that: it also includes a tightening cone sleeve, a can guide block and a cover plate, the tightening cone sleeve is mounted on the die base, the round cone die head is in the tightening cone sleeve, the inner wall of the tightening cone sleeve is an annular inclined surface which gradually tilts outward from top to bottom, the corresponding outer teeth molds and inner teeth molds are evenly distributed between the inner wall of the tightening cone sleeve and the round cone die head along the circumference of the tightening cone sleeve, the outer side surfaces of each outer teeth mold are connected to the outer sleeve by corresponding locking bolts, and elastic complex structures are arranged between each inner teeth mold. The outer surface of each tooth inner mold is provided with a threaded ridge, and the inner surface of each tooth outer mold is provided with a strip groove which cooperates with the corresponding threaded ridge. A tank inlet gap for the metal can opening to enter and exit is provided between the outer surface of each tooth inner mold and the inner surface of the corresponding tooth outer mold; the can guide block is installed on the lower end surface of the frustum die head, and the cover plate is installed on the edge of the lower end opening of the outer sleeve. The center of the cover plate is provided with a tank inlet for the metal can opening to enter and exit, and the tank inlet is communicated with the tank inlet gap, and the can guide block is in the tank inlet; the lower end surface of each tooth inner mold is slidably matched with the upper end surface of the can guide block, and the lower end surface of each tooth outer mold is slidably matched with the upper end surface of the cover plate.

[0006] Since the tightening cone sleeve is installed on the die base and the frustum die head is also set at the center of the die base, the die base simultaneously drives the tightening cone sleeve and the frustum die head to move up and down in the outer sleeve.

[0007] Before expanding the teeth, the tightening cone sleeve and the frustum die head are first driven upward by the die base, so that the annular inclined surface of the tightening cone sleeve pushes the outer die to move outward. At the same time, the frustum die head and the inner die are staggered by a certain distance, so that the inner side of the outer die pushes the inner die to move inward. The can entry gap between the outer side surface of the inner die and the inner side surface of the corresponding outer die becomes larger, which is convenient for the metal can to enter the opening.

[0008] During expansion, the can to be processed is inserted through the can inlet of the cover plate, with the can guide block positioned within the can opening. The guide block guides the can opening into the can inlet gap between the inner and outer molds. The die base then moves the tightening cone sleeve and the truncated cone die head downward. The annular slope of the tightening cone sleeve pushes the outer mold inward, while the truncated cone die head pushes the inner mold outward. The inner and outer molds move toward each other, sandwiching the can opening between them. The threaded ridges and grooves on the inner and outer molds extrude and form the can opening, forming threads along the edge of the can opening.

[0009] After the threads are formed, the die holder moves upward, the elastic reset piece resets the inner die inward, and the outer die returns to its original position under the guidance of the locking bolt. The formed metal can can be taken out from the can inlet, completing the processing process.

[0010] In a preferred embodiment, the lower end surface of the internal mold is provided with an inner guide block that runs inward and outward, and the lower end surface of the external mold is provided with an outer guide block that runs inward and outward, the outer guide block and the corresponding inner guide block being in a straight line, the upper end surface of the guide block being provided with a plurality of inner guide grooves that cooperate with the corresponding inner guide blocks, and the upper end surface of the cover plate being provided with a plurality of outer guide grooves that cooperate with the corresponding outer guide blocks, the inner guide blocks being located in the inner guide grooves, and the outer guide blocks being located in the outer guide grooves. The lower end surface of the internal mold is slidably engaged with the inner guide grooves of the upper end surface of the guide block via the inner guide block, and the lower end surface of the external mold is slidably engaged with the outer guide grooves of the upper end surface of the cover plate via the outer guide block, enabling the internal and external molds to slide along a fixed track during movement, thereby ensuring the accuracy and stability of the movement of the mold components, avoiding offset, and improving the quality of thread forming.

[0011] In a further preferred embodiment, the lower end opening edge of the tightening cone sleeve is provided with a plurality of vertically extending strip-shaped notches, the strip-shaped notches being the same in number and corresponding one to one with the outer guide blocks, the outer ends of the outer guide blocks extending outwardly forming stop blocks, the stop blocks being located outside the outer side surfaces of the corresponding outer guide blocks and correspondingly engaging with the corresponding strip-shaped notches, the rods of the locking bolts being located in the strip-shaped notches. This arrangement allows the tightening cone sleeve to obtain space for movement in the outer sleeve through the engagement of the various strip-shaped notches, without being obstructed by the rods of the locking bolts, and also allows the outer guide blocks to engage with the strip-shaped notches through the stop blocks, further enhancing the stability and accuracy of the movement of the external dental mold, while providing installation space for the locking bolts, and making the structural design more reasonable and compact.

[0012] In a further preferred embodiment, each external dental mold is provided with a screw hole on its outer surface for engaging the locking bolt. The outer sleeve is provided with a plurality of position-limiting through-holes corresponding to the corresponding screw holes. The shank of each locking bolt sequentially passes through the corresponding position-limiting through-hole, the strip-shaped notch, and the screw hole. This arrangement ensures that the external dental mold is securely connected to the outer sleeve via the locking bolts, ensuring stability during processing while facilitating adjustment and replacement of the external dental mold, thereby improving the mold's practicality and maintainability.

[0013] In a further preferred embodiment, the lower end surface of each dental internal mold is provided with an arcuate groove located above the inner guide block. Together, these arcuate grooves form an annular groove, and the elastic reset member is an annular spring mounted within the annular groove. This annular spring is easily assembled and disassembled, while providing uniform reset force to each dental internal mold, ensuring stability during machining.

[0014] In a preferred embodiment, the outer side of the internal dental mold is provided with an arc-shaped limiting step on the upper edge, and the inner side of the external dental mold is engaged with the arc-shaped limiting step by a snap fit. The engagement of the inner side of the external dental mold with the arc-shaped limiting step prevents the internal dental mold from moving further downward and becoming dislocated from the external dental mold.

[0015] In a preferred embodiment, the outer edge of the lower end face of the can guide block is a curved surface. This arrangement facilitates the smooth entry of the metal can into the can inlet and prevents the outer edge of the lower end face of the can guide block from being too sharp and scratching the inner wall of the metal can.

[0016] Compared with the prior art, the present invention has the following advantages:

[0017] (1) The utility model realizes the one-time forming of discontinuous screw threads through the synchronous relative motion mechanism of the inner and outer tooth molds, which greatly improves the production efficiency of threaded cans. At the same time, it has good stability and reliability and can meet the processing requirements of metal cans of different specifications.

[0018] (2) The utility model ensures the precise positioning of the metal can during the processing by means of the can guide block and the internal and external guide structures, thereby ensuring the stability and accuracy of the movement of each component of the mold and improving the quality of thread forming.

[0019] (3) The die base of the utility model drives the tightening cone sleeve and the circular table die head to move synchronously, achieving the coordination of structural movements and reducing the complexity of operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a structural diagram of a specific embodiment of the utility model;

[0021] Figure 2 yes Figure 1 Schematic diagram of the three-dimensional structure of the metal can expansion die;

[0022] Figure 3 yes Figure 1 Schematic diagram of the disassembled structure of some parts of the metal can expansion die;

[0023] Figure 4 yes Figure 3 Schematic diagram of the structure of the coordination between the central tooth inner mold, the outer tooth mold and the cover plate;

[0024] Figure 5 This is a schematic structural diagram of the annular spring and the inner molds of each tooth in a specific embodiment of the present invention;

[0025] Figure 6 yes Figure 1 Schematic diagram of the structure of the hidden jacket and cover. DETAILED DESCRIPTION

[0026] The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0027] like Figure 1-6 As shown, the metal can expansion mold in this embodiment includes a fixed base 1, an outer sleeve 2, a mold base 3, multiple inner molds 4, multiple outer molds 5, a tightening cone sleeve 6, a can guide block 7 and a cover plate 8. The inner molds 4 are the same in number and correspond one to one with the outer molds 5; the outer sleeve 2 is mounted on the fixed base 1, and the mold base 3 is movably mounted in the outer sleeve 2 and can move up and down in the outer sleeve 2. A frustum die head 9 with a larger upper part and a smaller lower part is provided in the center of the mold base 3; the tightening cone sleeve 6 is mounted on the mold base 3, and the frustum die head 9 is in the tightening cone sleeve 6. The inner wall of the tightening cone sleeve 6 is an annular inclined surface 61 that gradually tilts outward from top to bottom. The corresponding outer molds 5 and the inner molds 4 are evenly distributed between the inner wall of the tightening cone sleeve 6 and the frustum die head 9 along the circumference of the tightening cone sleeve 6. The outer side surfaces of each outer mold 5 are connected to the outer sleeve 2 by corresponding locking bolts 11, and an elastic reset member 1 is provided between each inner mold 4. 0; the annular inclined surface 61 slides in cooperation with the outer side surface of each tooth external mold 5, the outer peripheral surface of the frustum die head 9 slides in cooperation with the inner side surface of each tooth internal mold 4, the outer side surface of each tooth internal mold 4 is provided with a threaded ridge 41, and the inner side surface of each tooth external mold 5 is provided with a strip groove 51 that cooperates with the corresponding threaded ridge 41, and a tank inlet gap 52 for the metal can opening to enter and exit is provided between the outer side surface of each tooth internal mold 4 and the inner side surface of the corresponding tooth external mold 5; the can guide block 7 is installed on the lower end surface of the frustum die head 9, and the cover plate 8 is installed on the edge of the lower end opening of the outer sleeve 2. The center of the cover plate 8 is provided with a tank inlet 81 for the metal can opening to enter and exit, and the tank inlet 81 is communicated with the tank inlet gap 52, and the can guide block 7 is in the tank inlet 81; the lower end surface of each tooth internal mold 4 slides in cooperation with the upper end surface of the can guide block 7, and the lower end surface of each tooth external mold 5 slides in cooperation with the upper end surface of the cover plate 8.

[0028] Since the tightening cone sleeve 6 is installed on the die base 3 and the truncated cone die head 9 is also set at the center of the die base 3, the die base 3 simultaneously drives the tightening cone sleeve 6 and the truncated cone die head 9 to move up and down in the outer sleeve 2.

[0029] Before expanding the teeth, the tightening cone sleeve 6 and the truncated cone die head 9 are driven upward together by the die base 3, so that the annular inclined surface 61 of the tightening cone sleeve 6 pushes the outer mold 5 to move outward. At the same time, the truncated cone die head 9 and the inner mold 4 are staggered at a certain distance, so that the inner side surface of the outer mold 5 pushes the inner mold 4 to move inward, and the can entry gap 52 between the outer side surface of the inner mold 4 and the inner side surface of the corresponding outer mold 5 becomes larger, which is convenient for the metal can to enter the opening.

[0030] During expansion, the metal can to be processed is inserted through the can inlet 81 of the cover plate 8, with the can guide block 7 positioned within the can's opening. The guide block 7 then guides the can's opening into the can inlet gap 52 between the inner and outer molds 4, 5. The die base 3 then drives the tightening cone 6 and the truncated cone die head 9 downward. The annular slope 61 of the tightening cone 6 pushes the outer mold 5 inward, while the truncated cone die head 9 pushes the inner mold 4 outward. The inner and outer molds 4, 5, move toward each other, sandwiching the can's opening. The threaded protrusions 41 and grooves 51 on the inner and outer molds extrude and form the can's opening, forming threads along the edge of the can's opening.

[0031] After the thread is formed, the die holder 3 moves up, the elastic reset member 10 resets the inner die 4 inward, and the outer die 5 returns to its original position under the guidance of the locking bolt 11. The formed metal can can be taken out from the can inlet 81 to complete the processing process.

[0032] The lower end surface of the dental internal mold 4 is provided with an inner guide block 42 that runs inward and outward, and the lower end surface of the dental external mold 5 is provided with an outer guide block 53 that runs inward and outward. The outer guide block 53 is aligned with the corresponding inner guide block 42. The upper end surface of the guide block 7 is provided with a plurality of inner guide grooves 71 that cooperate with the corresponding inner guide blocks 42. The upper end surface of the cover plate 8 is provided with a plurality of outer guide grooves 82 that cooperate with the corresponding outer guide blocks 53. The inner guide blocks 42 are located in the inner guide grooves 71, and the outer guide blocks 53 are located in the outer guide grooves 82. The lower end surface of the dental internal mold 4 is slidably engaged with the inner guide grooves 71 on the upper end surface of the guide block 7 via the inner guide block 42, and the lower end surface of the dental external mold 5 is slidably engaged with the outer guide grooves 82 on the upper end surface of the cover plate 8 via the outer guide block 53. This enables the dental internal mold 4 and the dental external mold 5 to slide along a fixed track during movement, ensuring the accuracy and stability of the movement of the mold components, avoiding deviation, and improving the quality of thread forming.

[0033] The lower end opening edge of the tightening cone sleeve 6 is provided with a plurality of vertically extending strip-shaped notches 62. The number of the strip-shaped notches 62 is the same as that of the outer guide blocks 53 and they correspond one to one. The outer ends of the outer guide blocks 53 extend outward to form stop blocks 531. The stop blocks 531 are located outside the outer side surfaces of the corresponding outer guide blocks 53 and correspondingly engage with the corresponding strip-shaped notches 62. The rods of the locking bolts 11 are located in the strip-shaped notches 62. Through this arrangement, the tightening cone sleeve 6 is able to move freely in the outer sleeve 2 through the engagement of the various strip-shaped notches 62 without being obstructed by the rods of the locking bolts 11. The outer guide blocks 53 are also able to engage with the strip-shaped notches 62 through the stop blocks 531, further enhancing the stability and accuracy of the movement of the external dental mold 5. At the same time, space is provided for the installation of the locking bolts 11, resulting in a more reasonable and compact structural design.

[0034] Each external dental mold 5 is provided on its outer surface with a screw hole 54 that engages with the locking bolt 11. The outer sleeve 2 is provided with a plurality of position-limiting through-holes 21 corresponding to the corresponding screw holes 54. The rod of each locking bolt 11 passes through the corresponding position-limiting through-hole 21, the strip-shaped notch 62, and the screw hole 54 in sequence. This arrangement ensures that the external dental mold 5 is securely connected to the outer sleeve 2 via the locking bolts 11, ensuring stability during processing. It also facilitates adjustment and replacement of the external dental mold 5, improving the practicality and maintainability of the mold.

[0035] The lower end surface of each dental internal mold 4 is provided with an arcuate groove 43, which is located above the inner guide block 42. All the arcuate grooves 43 form an annular groove 45. The elastic reset member 10 is an annular spring 101, which is installed in the annular groove 45. The annular spring 101 is easy to assemble and disassemble, and at the same time provides a uniform reset force for each dental internal mold 4, ensuring stability during the processing.

[0036] The upper edge of the outer surface of the dental inner mold 4 is provided with an arc-shaped limiting step 44, and the upper edge of the inner side surface of the dental external mold 5 is snap-fitted with the arc-shaped limiting step 44. The snap-fitting of the upper edge of the inner side surface of the dental external mold 5 with the arc-shaped limiting step 44 can prevent the dental inner mold 4 from continuing to move downward and being disengaged from the dental external mold 5.

[0037] The outer edge of the lower end face of the tank guide block 7 is a cambered surface 72. By this arrangement, it is convenient for the metal can to smoothly enter the tank inlet 81, and the outer edge of the lower end face of the tank guide block 7 is avoided to be too sharp and scratch the metal can inner wall.

[0038] In addition, it should be noted that the names of the various parts of the specific embodiments described in this specification may be different. Any equivalent or simple changes made based on the structure, features, and principles described in the concept of this utility model patent are included in the scope of protection of this utility model patent. Those skilled in the art of the technical field to which this utility model belongs may make various modifications or supplements to the specific embodiments described, or replace them with similar methods. As long as they do not deviate from the structure of this utility model or exceed the scope defined by this claim, they shall fall within the scope of protection of this utility model.

Claims

1. A metal can expansion die, comprising a fixed base, an outer shell, a die base, a plurality of internal die molds, and a plurality of external die molds, wherein the number of internal die molds and the number of external die molds are the same and correspond one to one; the outer shell is mounted on the fixed base, the die base is movably mounted in the outer shell and can move up and down within the outer shell, and a round cone die head with a larger upper portion and a smaller lower portion is provided in the center of the die base; the characteristics are: The invention also includes a tightening cone sleeve, a tank guide block and a cover plate. The tightening cone sleeve is installed on the die base. The frustum die head is in the tightening cone sleeve. The inner wall of the tightening cone sleeve is an annular inclined surface that gradually tilts outward from top to bottom. The corresponding external molds and internal molds are evenly distributed between the inner wall of the tightening cone sleeve and the frustum die head along the circumference of the tightening cone sleeve. The outer side surfaces of each external mold are connected to the outer sleeve by corresponding locking bolts, and elastic reset parts are provided between each internal mold; the annular inclined surface is slidably matched with the outer side surface of each external mold, and the outer circumferential surface of the frustum die head is slidably matched with the inner side surface of each internal mold. The outer side surfaces of each internal mold are It is provided with a threaded rib, and the inner side surface of each outer mold is provided with a strip groove that cooperates with the corresponding threaded rib. A tank inlet gap for the metal can opening to enter and exit is provided between the outer side surface of each inner mold and the inner side surface of the corresponding outer mold; the tank guide block is installed on the lower end surface of the frustum die head, and the cover plate is installed on the edge of the lower end opening of the outer sleeve. The center of the cover plate is provided with a tank inlet for the metal can opening to enter and exit, the tank inlet is communicated with the tank inlet gap, and the tank guide block is located in the tank inlet; the lower end surface of each inner mold is slidably matched with the upper end surface of the tank guide block, and the lower end surface of each outer mold is slidably matched with the upper end surface of the cover plate.

2. The metal can expansion die according to claim 1, characterized in that: The lower end surface of the inner dental mold is provided with an inner guide block running inward and outward, and the lower end surface of the outer dental mold is provided with an outer guide block running inward and outward, the outer guide block and the corresponding inner guide block are on the same straight line, the upper end surface of the guide tank block is provided with a plurality of inner guide grooves cooperating with the corresponding inner guide blocks, the upper end surface of the cover plate is provided with a plurality of outer guide grooves cooperating with the corresponding outer guide blocks, the inner guide block is in the inner guide groove, and the outer guide block is in the outer guide groove.

3. The metal can expansion die according to claim 2, characterized in that: The lower end opening edge of the tightening cone sleeve is provided with a plurality of strip notches running up and down, the number of the strip notches is the same as that of the outer guide blocks and they correspond one to one, the outer end of the outer guide block extends outward to form a limit block, and the limit block is located outside the outer side surface of the corresponding outer guide block and corresponds to the corresponding strip notch, and the rod of the locking bolt is located in the strip notch.

4. The metal can expansion die according to claim 3, characterized in that: The outer side of each external dental mold is provided with a screw hole that cooperates with the locking bolt, and the outer sleeve is provided with multiple limiting through holes corresponding to the corresponding screw holes. The rod of each locking bolt passes through the corresponding limiting through hole, strip notch, and screw hole in sequence.

5. The metal can expansion die according to claim 2, characterized in that: The lower end surface of each dental internal mold is provided with an arc groove, which is located above the inner guide block. All the arc grooves form an annular groove. The elastic reset member is an annular spring, which is installed in the annular groove.

6. The metal can expansion die according to claim 1, characterized in that: The upper edge of the outer side surface of the dental inner mold is provided with an arc-shaped limiting step, and the upper edge of the inner side surface of the dental outer mold is snap-fitted with the arc-shaped limiting step.

7. The metal can expansion die according to claim 1, characterized in that: The outer edge of the lower end surface of the tank guide block is a curved surface.

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