CN220387796U - Cold heading assembling die for thin-wall straight-line tooth ring body - Google Patents
Cold heading assembling die for thin-wall straight-line tooth ring body Download PDFInfo
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- CN220387796U CN220387796U CN202321967882.XU CN202321967882U CN220387796U CN 220387796 U CN220387796 U CN 220387796U CN 202321967882 U CN202321967882 U CN 202321967882U CN 220387796 U CN220387796 U CN 220387796U
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- 238000001816 cooling Methods 0.000 claims abstract description 5
- 239000000463 material Substances 0.000 claims description 29
- 230000002093 peripheral effect Effects 0.000 claims description 15
- 238000010008 shearing Methods 0.000 claims description 11
- 230000006835 compression Effects 0.000 claims description 8
- 238000007906 compression Methods 0.000 claims description 8
- 238000005520 cutting process Methods 0.000 claims description 8
- 238000000034 method Methods 0.000 claims description 7
- 238000006073 displacement reaction Methods 0.000 claims description 6
- 230000000149 penetrating effect Effects 0.000 claims description 6
- 238000002788 crimping Methods 0.000 claims description 5
- 238000007599 discharging Methods 0.000 claims description 2
- 238000003754 machining Methods 0.000 abstract description 10
- 238000000465 moulding Methods 0.000 abstract description 5
- 238000010924 continuous production Methods 0.000 abstract description 3
- 238000012797 qualification Methods 0.000 abstract description 3
- 230000013011 mating Effects 0.000 description 5
- 238000003825 pressing Methods 0.000 description 4
- 238000007493 shaping process Methods 0.000 description 3
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 238000005242 forging Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
Abstract
The utility model discloses a cold heading combined die of a thin-wall straight-row tooth ring body, which comprises a chamfering ring cold heading die for forming a bottom chamfering ring, a preformed cold heading die for forming a top chamfering ring and pre-cooling and heading a tube cavity, a first tube cavity and straight-row tooth cold heading die for forming a top cavity of a tube cavity and preformed straight-row teeth, a second tube cavity and straight-row tooth cold heading die for forming a bottom cavity of the tube cavity and performing secondary cold heading of straight-row teeth, and a tube cavity through cold heading die for communicating the top cavity and the bottom cavity of the tube cavity. The utility model can realize cold heading forming of the thin-wall straight-row toothed ring body, reduces machining difficulty and machining cost, and has reliable product forming structure strength. The cold heading forming precision of the product is guaranteed, and the product qualification rate is obviously improved. The cold heading die is reasonable in combination and arrangement, meets the requirements of continuous cold heading molding and high-efficiency continuous production.
Description
Technical Field
The utility model relates to a cold heading combined die of a thin-wall straight-row tooth ring body, and belongs to the technical field of cold heading dies.
Background
Cold heading is a forging method for upsetting (usually local upsetting) a metal bar by using a die at normal temperature. Typically used to make heads for screws, bolts, rivets, etc. Cutting may be reduced or replaced.
At present, there is a thin-wall straight-row tooth ring body, which comprises an annular main body with a pipe cavity, wherein the annular main body is provided with a straight-row tooth peripheral wall, the top end and the bottom end of the straight-row tooth peripheral wall are respectively provided with a chamfer ring, the thin-wall straight-row tooth ring body is generally machined in a mode of cutting a pipe, namely, after the pipe is cut, the chamfer rings at the top and the bottom are formed, and then the straight-row tooth peripheral wall is machined and formed, so that the machining and forming are difficult, the wall body of the annular main body is thinner, the machining deformation is easy to generate, and meanwhile, the structural strength of the thin-wall straight-row tooth ring body is unreliable.
Disclosure of Invention
The utility model aims to solve the defects in the prior art, and provides a cold heading combined die for a thin-wall straight-row tooth ring body, aiming at the problems that the traditional thin-wall straight-row tooth ring body machining and forming efficiency is low, and the structural strength and the forming precision of a product cannot be guaranteed.
In order to achieve the above purpose, the technical scheme adopted by the utility model is as follows:
the cold heading assembling die of the thin-wall straight-row tooth ring body comprises an annular main body with a pipe cavity, the annular main body is provided with a straight-row tooth peripheral wall, the straight-row tooth peripheral wall is provided with a top chamfer ring and a bottom chamfer ring,
the cold heading assembling die comprises a chamfering ring cold heading die for bottom chamfering ring forming, a preformed cold heading die for top chamfering ring forming and pipe cavity pre-cooling heading forming, a first pipe cavity for pipe cavity top cavity forming and straight row tooth cold heading die for straight row tooth preforming, a second pipe cavity for pipe cavity bottom cavity forming and straight row tooth secondary cold heading die for straight row tooth secondary cold heading, and a pipe cavity through cold heading die for pipe cavity top cavity and bottom cavity through.
Preferably, the chamfering ring cold heading die comprises a chamfering ring cold heading bottom die holder and a chamfering ring cold heading top die holder with a stamping stroke towards the chamfering ring cold heading base,
the chamfering ring cold upsetting die holder is provided with a shaft body carrying channel and a bottom chamfering ring model part positioned at the bottom of the shaft body carrying channel,
and the chamfering ring cold heading top die holder is provided with a shaft body compression bar matched with the shaft body carrying channel.
Preferably, the chamfer ring cold heading die holder is provided with a chamfer cold heading lifting rod with lifting displacement penetrating through the bottom chamfer ring model part.
Preferably, the preformed cold heading die comprises a preformed bottom die holder and a preformed top die holder with a stamping stroke towards the preformed base,
the preformed bottom die holder is provided with a preformed bottom die cavity and a bottom cavity preformed die column which is arranged in the preformed bottom die cavity and is used for preforming the bottom cavity of the tube cavity,
the top cavity pre-forming column for top cavity pre-forming of the tube cavity and the top chamfer ring model part for top chamfer ring forming are arranged in the top cavity pre-forming column.
Preferably, the first pipe cavity and the straight-row tooth cold heading die and the second pipe cavity and the straight-row tooth cold heading die are both matched cold heading dies, the two matched cold heading dies are used for cold heading forming respectively in two directions of turning of a workpiece,
the matched cold heading die comprises a matched cold heading die holder and a matched cold heading top die holder with a stamping stroke facing the matched cold heading die holder,
the matched cold heading bottom die seat comprises a tooth forming channel for forming the peripheral wall of the straight row of teeth and a workpiece supporting rod arranged in the tooth forming channel,
the matched cold heading top die seat comprises a cold heading rod used for crimping a workpiece and a cavity forming lug arranged on the cold heading rod and used for forming a top cavity or a bottom cavity of the tube cavity.
Preferably, the tube cavity through cold heading die comprises a tube cavity through cold heading die holder and a tube cavity through cold heading die holder provided with a tube cavity through cold heading die holder facing the tube cavity through cold heading die holder,
the pipe cavity through cold heading bottom die holder comprises a bearing carrier for bearing a workpiece and a discharging through channel arranged on the bearing carrier,
the tube cavity through cold heading top die holder comprises a through cold heading punch head used for penetrating through the tube cavity.
Preferably, a positioning cold heading die is arranged between the chamfering ring cold heading die and the preformed cold heading die, the positioning cold heading die comprises a positioning cold heading bottom die holder and a positioning cold heading top die holder,
the positioning cold heading bottom die seat comprises a positioning loading groove and a positioning taper point arranged on the positioning loading groove,
the positioning cold heading top die seat comprises a positioning matched compression bar matched with the positioning loading groove, and a positioning cone part is arranged at the bottom of the positioning matched compression bar.
Preferably, the cold heading assembling die comprises a shaft material cutting die, the shaft material cutting die comprises a shaft material base and a shearing die holder which is arranged at the top of the shaft material base and has horizontal shearing displacement,
the shaft material base is internally provided with a shaft material channel for passing through a shaft material, and the shearing die holder is internally provided with a shaft material carrying channel for carrying the shaft material.
The beneficial effects of the utility model are mainly as follows:
1. the cold heading forming of the thin-wall straight-row toothed ring body can be realized, the machining difficulty and the machining cost are reduced, and the forming structure strength of the product is reliable.
2. The cold heading forming precision of the product is guaranteed, and the product qualification rate is obviously improved.
3. The cold heading die is reasonable in combination and arrangement, meets the requirements of continuous cold heading molding and high-efficiency continuous production.
Drawings
Other features, objects and advantages of the present application will become more apparent upon reading of the detailed description of non-limiting embodiments, made with reference to the following drawings, in which:
FIG. 1 is a schematic structural view of a cold heading assembling die of a thin-wall straight-row tooth ring body.
Fig. 2 is a schematic diagram of forming the thin-walled straight-row tooth ring body in the cold heading combined die.
Fig. 3 is a schematic structural view of a chamfering ring cold-heading die in the cold-heading assembling die of the utility model.
Fig. 4 is a schematic structural view of a preformed cold heading die in the cold heading assembling die of the utility model.
Fig. 5 is a schematic structural view of a cold heading die matched with the cold heading die in the cold heading combined die.
Fig. 6 is a schematic structural view of a tube cavity penetrating through a cold heading die in the cold heading combined die.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present utility model more apparent, the technical solutions of the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model, and it is apparent that the described embodiments are some embodiments of the present utility model, but not all embodiments of the present utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
The present application is described in further detail below with reference to the drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the utility model and are not limiting of the utility model. It should be noted that, for convenience of description, only the portions related to the present utility model are shown in the drawings. It should be noted that, in the case of no conflict, the embodiments and features in the embodiments may be combined with each other.
The utility model provides a cold heading combined die of a thin-wall straight-row tooth ring body, as shown in fig. 1 and 2, the thin-wall straight-row tooth ring body comprises an annular main body 200 with a pipe cavity 100, the annular main body 200 is provided with a straight-row tooth peripheral wall 300, and the straight-row tooth peripheral wall is provided with a top chamfer ring 400 and a bottom chamfer ring 500.
As shown in fig. 1, the cold heading assembling die comprises a chamfering ring cold heading die 1 for forming a bottom chamfering ring 500, a preformed cold heading die 2 for forming a top chamfering ring 400 and pre-heading a tube cavity, a first tube cavity and straight tooth cold heading die 31 for forming a top cavity 110 of the tube cavity and pre-forming straight teeth, a second tube cavity and straight tooth cold heading die 32 for forming a bottom cavity 120 of the tube cavity and performing straight tooth secondary cold heading, and a tube cavity through cold heading die 4 for communicating the top cavity 110 of the tube cavity with the bottom cavity 120, which are sequentially arranged.
The specific implementation process and principle description:
firstly, feeding a shaft body 600, forming a bottom end chamfering ring 500 in a chamfering ring cold heading die, then entering a preforming cold heading die 2 for top end chamfering ring 400 and tube cavity pre-cooling heading forming, namely, forming flattening cold heading and top end chamfering ring forming of the shaft body through the preforming cold heading die 2, forming partial embedded grooves at the top end and the bottom end of the tube cavity, sequentially passing through a first tube cavity and an in-line tooth cold heading die 31, a second tube cavity and an in-line tooth cold heading die 32 after pre-cooling heading forming, forming a top cavity 110, a bottom cavity 120 and an in-line tooth peripheral wall 300, and finally connecting the top cavity 110 and the bottom cavity 120 through a tube cavity through cold heading die 4 to form a tube cavity 100.
So carry out the cold heading in proper order through axis body 600 and satisfy the cold heading shaping demand of thin wall straight row tooth ring body, need not to carry out machining operation, its cold heading structural strength is reliable stable, and shaping precision obtains the guarantee simultaneously.
In one particular embodiment, as shown in fig. 1 and 3, the chamfer ring cold heading die 1 includes a chamfer ring cold heading die holder 11 and a chamfer ring cold heading die holder 12 having a stamping stroke toward the chamfer ring cold heading base.
The chamfering ring cold heading die holder 11 is provided with a shaft body carrying channel 111 and a bottom chamfering ring model part 112 positioned at the bottom of the shaft body carrying channel.
The chamfering ring cold heading top die holder 12 is provided with a shaft body pressing rod 120 matched with the shaft body carrying channel.
Specifically, the shaft 600 is placed in the shaft mounting passage 111, and the shaft pressing rod 120 is pressed down so that the bottom of the shaft 600 forms the bottom chamfer ring 500 by the bottom chamfer ring model 112.
In detail, the chamfer ring cold heading die holder 11 is provided with a chamfer cold heading lifting rod 113 with lifting displacement penetrating through the bottom chamfer ring model part.
The lifting and demoulding of the workpiece can be realized through the chamfering cold heading lifting rod 113,
in one particular embodiment, as shown in fig. 1 and 4, the preformed cold heading die 2 includes a preformed bottom die holder 21 and a preformed top die holder 22 having a stamping stroke toward the preformed base.
The preformed bottom die holder 21 is provided with a preformed bottom die cavity 211 and a bottom cavity preformed die column 212 for preforming the bottom cavity of the tube cavity.
The preformed top die holder 22 is provided with a preformed top die cavity 221 for matching with the preformed bottom die cavity, and a top cavity preformed post 222 for top cavity preforming of the tube cavity and a top chamfer ring model part 223 for top chamfer ring forming are arranged in the preformed top die cavity.
Specifically, the workpiece molded by the bottom chamfer ring 500 is set in the preformed bottom mold cavity 211, cold headed by the preformed bottom mold cavity 211 and the preformed top mold cavity 221, so that the thickness of the workpiece is compressed, and the shaping of the top chamfer ring is achieved by the top chamfer ring mold portion 223.
And the bottom cavity pre-forming die column 212 and the top cavity pre-forming die column 222 form a pre-forming inner groove 700 on the workpiece, so as to meet the requirement of forming and matching the top cavity 110 and the bottom cavity 120 in the later stage, and ensure that the forming position precision of the top cavity 110 and the bottom cavity 120 is high and the forming cold heading shape is changed reliably.
In a specific embodiment, as shown in fig. 1 and fig. 5, the first tube cavity and the straight-row tooth cold heading die and the second tube cavity and the straight-row tooth cold heading die are both matched cold heading dies 3, and the two matched cold heading dies 3 are used for cold heading forming in two directions of turning of a workpiece respectively.
The workpiece is first cold-headed in the front direction by matching with the cold-heading die 3, and then transferred or the workpiece is cold-headed in the same die.
Specifically, the mating cold-heading die 3 includes a mating cold-heading die holder 33 and a mating cold-heading die holder 34 provided with a punching stroke toward the mating cold-heading die holder.
The mating cold heading die holder 33 includes a tooth forming channel 331 for forming the outer peripheral wall of the inline tooth, and a workpiece support rod 332 disposed within the tooth forming channel.
The matched cold heading top die holder 34 comprises a cold heading rod 341 used for crimping a workpiece, and a cavity forming lug 342 arranged on the cold heading rod and used for forming a top cavity or a bottom cavity of a pipe cavity.
Specifically, the workpiece is placed on the top of the tooth forming channel 331, cold heading crimping is performed by the cold heading press bar 341, under the action of the preformed inner groove 700, the requirement of initial position degree and crimping guiding precision is met, the in-line tooth peripheral wall 300 on the periphery of the workpiece is formed along with the pressing of the workpiece, and meanwhile, the top cavity or the bottom cavity is formed in the gradual pressing.
After the forming, the workpiece is turned over, cold upsetting is performed, the outer peripheral wall 300 of the straight row teeth is subjected to secondary finish forming, and the top cavity and the bottom cavity are all formed.
In one embodiment, as shown in fig. 1 and 6, the lumen-passing-through cold-heading die 4 includes a lumen-passing-through cold-heading die holder 41 and a lumen-passing-through cold-heading die holder 42 provided toward the lumen-passing-through cold-heading die holder.
The tube cavity through cold heading die holder 41 comprises a bearing carrier 411 for bearing a workpiece and a discharge through channel 412 arranged on the bearing carrier.
The lumen through cold heading die holder 42 includes a through cold heading punch 420 for penetrating the lumen.
Specifically, the workpiece is mounted on the support carrier 411, and the cold heading punch 420 is connected to the cold heading to form the through-hole of the lumen 100, and the cold heading cut sheet is discharged through the discharge through-passage 412.
In a specific embodiment, as shown in fig. 1, a positioning cold heading die 5 is arranged between a chamfering ring cold heading die and a preformed cold heading die, the positioning cold heading die comprises a positioning cold heading bottom die holder 51 and a positioning cold heading top die holder 52, the positioning cold heading bottom die holder comprises a positioning loading groove and a positioning taper point 53 arranged on the positioning loading groove, the positioning cold heading top die holder 52 comprises a positioning matched compression bar matched with the positioning loading groove, and a positioning taper portion 54 is arranged at the bottom of the positioning matched compression bar.
Namely, the top cavity and the bottom cavity have larger extrusion amount when being molded, and the conical grooves for breaking the tension can be formed on the shaft body through the positioning conical points 53 and the positioning conical parts 54, so that the deformation is more uniform and the molding precision is higher when the preforming and the cavity molding are performed.
In a specific embodiment, the cold heading assembling die comprises a shaft material cutting die 6, the shaft material cutting die comprises a shaft material base 61 and a shearing die holder 62 which is arranged at the top of the shaft material base and provided with a horizontal shearing displacement, a shaft material channel for passing through a shaft material is arranged in the shaft material base, and a shaft material carrying channel for carrying the shaft material is arranged in the shearing die holder.
The continuous feeding and shearing requirements of the shaft materials are met, and the continuous feeding and shearing requirements of the shaft materials belong to the prior art and are not repeated here.
Through the description, the cold heading combined die of the thin-wall straight-row tooth ring body can realize cold heading forming of the thin-wall straight-row tooth ring body, reduce machining difficulty and machining cost, and has reliable product forming structure strength. The cold heading forming precision of the product is guaranteed, and the product qualification rate is obviously improved. The cold heading die is reasonable in combination and arrangement, meets the requirements of continuous cold heading molding and high-efficiency continuous production.
The terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus/apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus/apparatus.
Thus far, the technical solution of the present utility model has been described in connection with the preferred embodiments shown in the drawings, but it is easily understood by those skilled in the art that the scope of protection of the present utility model is not limited to these specific embodiments. Equivalent modifications and substitutions for related technical features may be made by those skilled in the art without departing from the principles of the present utility model, and such modifications and substitutions will fall within the scope of the present utility model.
Claims (8)
1. The cold heading assembling die of the thin-wall straight-row tooth ring body comprises an annular main body with a pipe cavity, the annular main body is provided with a straight-row tooth peripheral wall, the straight-row tooth peripheral wall is provided with a top chamfer ring and a bottom chamfer ring,
the method is characterized in that:
the cold heading assembling die comprises a chamfering ring cold heading die for bottom chamfering ring forming, a preformed cold heading die for top chamfering ring forming and pipe cavity pre-cooling heading forming, a first pipe cavity for pipe cavity top cavity forming and straight row tooth cold heading die for straight row tooth preforming, a second pipe cavity for pipe cavity bottom cavity forming and straight row tooth secondary cold heading die for straight row tooth secondary cold heading, and a pipe cavity through cold heading die for pipe cavity top cavity and bottom cavity through.
2. The cold heading assembling die of the thin-wall straight-row tooth ring body, which is characterized in that:
the chamfering ring cold heading die comprises a chamfering ring cold heading bottom die holder and a chamfering ring cold heading top die holder with a stamping stroke facing the chamfering ring cold heading base,
the chamfering ring cold upsetting die holder is provided with a shaft body carrying channel and a bottom chamfering ring model part positioned at the bottom of the shaft body carrying channel,
and the chamfering ring cold heading top die holder is provided with a shaft body compression bar matched with the shaft body carrying channel.
3. The cold heading assembling die of the thin-wall straight tooth ring body according to claim 2, wherein:
and the chamfering ring cold heading bottom die holder is provided with a chamfering cold heading jacking rod which penetrates through the bottom chamfering ring die part and has lifting displacement.
4. The cold heading assembling die of the thin-wall straight-row tooth ring body, which is characterized in that:
the preformed cold heading die comprises a preformed bottom die holder and a preformed top die holder with a stamping stroke towards the preformed base,
the preformed bottom die holder is provided with a preformed bottom die cavity and a bottom cavity preformed die column which is arranged in the preformed bottom die cavity and is used for preforming the bottom cavity of the tube cavity,
the top cavity pre-forming column for top cavity pre-forming of the tube cavity and the top chamfer ring model part for top chamfer ring forming are arranged in the top cavity pre-forming column.
5. The cold heading assembling die of the thin-wall straight-row tooth ring body, which is characterized in that:
the first pipe cavity and the straight-row tooth cold heading die and the second pipe cavity and the straight-row tooth cold heading die are both matched cold heading dies, the two matched cold heading dies are used for respectively cold heading forming in two directions of turning of a workpiece,
the matched cold heading die comprises a matched cold heading die holder and a matched cold heading top die holder with a stamping stroke facing the matched cold heading die holder,
the matched cold heading bottom die seat comprises a tooth forming channel for forming the peripheral wall of the straight row of teeth and a workpiece supporting rod arranged in the tooth forming channel,
the matched cold heading top die seat comprises a cold heading rod used for crimping a workpiece and a cavity forming lug arranged on the cold heading rod and used for forming a top cavity or a bottom cavity of the tube cavity.
6. The cold heading assembling die of the thin-wall straight-row tooth ring body, which is characterized in that:
the pipe cavity through cold heading die comprises a pipe cavity through cold heading bottom die holder and a pipe cavity through cold heading top die holder which faces the pipe cavity through cold heading bottom die holder,
the pipe cavity through cold heading bottom die holder comprises a bearing carrier for bearing a workpiece and a discharging through channel arranged on the bearing carrier,
the tube cavity through cold heading top die holder comprises a through cold heading punch head used for penetrating through the tube cavity.
7. The cold heading assembling die of the thin-wall straight-row tooth ring body, which is characterized in that:
a positioning cold heading die is arranged between the chamfering ring cold heading die and the preformed cold heading die, the positioning cold heading die comprises a positioning cold heading bottom die holder and a positioning cold heading top die holder,
the positioning cold heading bottom die seat comprises a positioning loading groove and a positioning taper point arranged on the positioning loading groove,
the positioning cold heading top die seat comprises a positioning matched compression bar matched with the positioning loading groove, and a positioning cone part is arranged at the bottom of the positioning matched compression bar.
8. The cold heading assembling die of the thin-wall straight-row tooth ring body, which is characterized in that:
the cold heading combined die comprises a shaft material cutting die, the shaft material cutting die comprises a shaft material base and a shearing die holder which is arranged at the top of the shaft material base and has horizontal shearing displacement,
the shaft material base is internally provided with a shaft material channel for passing through a shaft material, and the shearing die holder is internally provided with a shaft material carrying channel for carrying the shaft material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321967882.XU CN220387796U (en) | 2023-07-25 | 2023-07-25 | Cold heading assembling die for thin-wall straight-line tooth ring body |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321967882.XU CN220387796U (en) | 2023-07-25 | 2023-07-25 | Cold heading assembling die for thin-wall straight-line tooth ring body |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220387796U true CN220387796U (en) | 2024-01-26 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321967882.XU Active CN220387796U (en) | 2023-07-25 | 2023-07-25 | Cold heading assembling die for thin-wall straight-line tooth ring body |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220387796U (en) |
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2023
- 2023-07-25 CN CN202321967882.XU patent/CN220387796U/en active Active
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