CN112024683A - Thin-wall flat-bottom plug cover with weakening groove and forming mold and method thereof - Google Patents
Thin-wall flat-bottom plug cover with weakening groove and forming mold and method thereof Download PDFInfo
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- CN112024683A CN112024683A CN202010828167.2A CN202010828167A CN112024683A CN 112024683 A CN112024683 A CN 112024683A CN 202010828167 A CN202010828167 A CN 202010828167A CN 112024683 A CN112024683 A CN 112024683A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D22/00—Shaping without cutting, by stamping, spinning, or deep-drawing
- B21D22/02—Stamping using rigid devices or tools
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D22/00—Shaping without cutting, by stamping, spinning, or deep-drawing
- B21D22/14—Spinning
- B21D22/16—Spinning over shaping mandrels or formers
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D37/00—Tools as parts of machines covered by this subclass
- B21D37/10—Die sets; Pillar guides
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02K—JET-PROPULSION PLANTS
- F02K1/00—Plants characterised by the form or arrangement of the jet pipe or nozzle; Jet pipes or nozzles peculiar thereto
- F02K1/78—Other construction of jet pipes
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- General Engineering & Computer Science (AREA)
- Shaping Metal By Deep-Drawing, Or The Like (AREA)
Abstract
The invention relates to a thin-wall flat-bottom plug cover with weakening grooves, a forming die and a forming method thereof, wherein the plug cover is processed and formed through a special tooling die with an indentation disc; the structure for adjusting the depth of the weakening groove is designed on the tool, the use requirements of the plugging conditions with different opening pressures can be met, and one-step processing and forming of the flat-bottom plugging cover and the weakening groove can be realized by utilizing stamping equipment; or through the wall thickness compensation calculation of the blocking cover, the spinning thinning amount is considered in advance when raw materials are prepared, the blocking cover is manufactured through spinning forming, then petal nicks (namely weakening grooves are a plurality of radial grooves which are uniformly distributed along the circumferential direction) are formed through a pre-designed indentation disc, the spinning forming of the blocking cover can be realized, the two schemes can be parallel, and the requirements of different types of production scales can be met. The invention has high processing efficiency and high utilization rate of raw materials.
Description
Technical Field
The invention belongs to the field of engines, and particularly relates to a thin-wall flat-bottom plug cover with a weakening groove, and a forming mold and a forming method thereof.
Background
The thin-wall flat-bottom plug cover with the weakening groove is a brand new structure of a design concept of no throwing matter adopted in a novel engine spray pipe, and the design requirement of the plug cover is that the plug cover is of a structure with a thin middle part and a thickened bonding section, so that the plug cover is inconsistent with the actual law of the traditional spinning forming (the bonding section is large in deformation and thinning and the wall thickness is thinner than the middle section), and the scheme that the plug cover can only be formed by machining at present is adopted for the plug cover with the structure.
The method adopts bar stock for mechanical processing, and the main processing technological process is as follows: raw material purchasing, re-inspection → rough machining with large feed amount → stress relief aging (day > 3) → semi-finishing → stable size aging (day > 3) → finishing → inspection → delivery. The aluminum bar for machining is adopted, and the utilization rate of raw materials is only 7%; in addition, the material has larger processing deformation, needs to be subjected to multiple times of natural aging and artificial aging, and has long processing period and higher processing cost.
The traditional method for opening the plug cover is that the plug cover is opened to release pressure by annular rupture of an adhesive surface at the opening part of the plug cover, the plug cover with a weakening groove is provided with the weakening groove with a certain depth on the bottom surface of the plug cover, the plug cover is ruptured in a petal type from the center to release pressure when the pressure reaches a designed value during working, no throwing object exists in the working process, but the existing technological method is difficult to realize; and the special requirements of thin middle and high thickness at two sides of the design requirement cannot be met by adopting a common spinning forming method.
Disclosure of Invention
The technical problem to be solved is as follows:
in order to avoid the defects of the prior art, the invention provides the thin-wall flat-bottom plug cover with the weakening groove and the forming method thereof, and the design function requirements of the product are met through the integral die forming or spinning forming design, and a series of defects of the traditional machining are overcome.
The technical scheme of the invention is as follows: a thin-wall flat-bottom plug cover with weakening grooves is characterized in that the bottom of the plug cover is of a planar structure, and the thickness of the circumferential wall surface is greater than that of the bottom plane; the method is characterized in that: the bottom surface of blanking cover is opened has the weakening groove, the weakening groove is a plurality of radial grooves along circumference equipartition.
The utility model provides a forming die of flat blanking cover of thin wall in area weakening groove which characterized in that: the device comprises a female die, an auxiliary adjusting mechanism, an indentation disc, a blank holder, a male die and a die handle; the auxiliary adjusting mechanism is coaxially arranged at the bottom of the female die step blind hole and is used for adjusting the depth in the female die blind hole; the indentation disc is coaxially arranged above the auxiliary adjusting mechanism through an adjusting gasket; the inner peripheral surface structure of the upper part of the stepped blind hole of the female die is the same as the outer peripheral surface structure of the blanking cover;
the blank holder is of an annular structure, the inner diameter of the blank holder is equal to the outer diameter of the opening end of the blocking cover, the outer diameter of the blank holder is larger than the outer diameter of the blocking cover blank, and the blank holder is coaxially and fixedly arranged above the female die through an inner hexagonal screw and used for compressing the outer edge of the blocking cover blank;
the structure below the male die is the same as the structure of the inner surface of the plug cover and is used for forming the plug cover, and the top of the male die is coaxially provided with a die handle through an inner hexagonal set screw; and applying pressure to the die handle through a punching device, and further coaxially and sequentially pressing the male die into the blank holder and the female die to complete the forming of the plug cover.
The further technical scheme of the invention is as follows: the indentation disc is of a circular plate structure, and a plurality of radial protrusions are uniformly distributed on the upper end face of the indentation disc along the circumferential direction and correspond to the weakening grooves of the blocking cover.
A forming method of a thin-wall flat-bottom plug cover with a weakening groove is characterized by comprising the following specific steps:
the method comprises the following steps: selecting a processing plate according to the product requirements, and rechecking chemical components and mechanical properties according to the performance requirements of raw materials;
step two: placing the female die on a working table surface of stamping equipment, and aligning the female die with the center of a main shaft of the stamping equipment; placing the indentation disc on a step positioning surface in a blind hole of the female die, and leveling the indentation disc;
step three: preparing and blanking a plate blank, namely firstly placing the plate blank on the upper end surface of the female die, and then fixing the blank holder on the upper end surface of the female die through a socket head cap screw; meanwhile, the male die and the die shank are assembled, and the die shank is fixed in a main shaft sliding block of the stamping equipment;
step four: debugging is carried out after the whole die is installed;
step five: performing stamping and die testing, and adjusting the assembly position of the die according to the actually measured indentation depth; the stamping requirements of different weakening depth blanking covers can be met by replacing the adjusting gaskets;
step six: and (4) completing the punch forming of the blocking cover, turning and repairing a flanging, detecting the size of the formed blocking cover and weakening the depth of the groove.
The further technical scheme of the invention is as follows: step one, selecting an aluminum alloy plate with the standard of GB/T3880.1-2012, wherein the material grade is 1050A in an annealing state.
The further technical scheme of the invention is as follows: and in the second step, the end face runout of the female die is not more than 0.02 mm.
The further technical scheme of the invention is as follows: and in the second step, the end face runout of the indentation disc is not more than 0.01 mm.
A forming method of a thin-wall flat-bottom plug cover with a weakening groove is characterized by comprising the following specific steps:
the method comprises the following steps: selecting a processing plate, and rechecking chemical components and mechanical properties according to the performance requirements of the raw materials;
step two: mounting the male die on spinning equipment, and aligning the male die with the center of a main shaft of the spinning equipment; placing the plate blank on the end face of the male die, and pressing the plate blank by using a tail top disc;
step three: the male die is screwed out of the blocking cover on spinning equipment by using a bending forming and die sticking spinning method;
step four: assembling the plug cover formed by spinning in the step three with the indentation disc, and punching a weakening groove by using the indentation disc;
step five: various dimensions and weakening groove depths were examined.
The further technical scheme of the invention is as follows: and in the second step, the end face and excircle runout of the male die are not more than 0.03 mm.
Advantageous effects
The invention has the beneficial effects that: by adopting the traditional mechanical processing method, about 10 days are needed for processing a single product, the utilization rate of raw materials is only 7 percent, but the integral forming die is designed and manufactured by adopting the invention, and a structure for adjusting the depth of the weakening groove is designed on a tool, so that the use requirements of the working conditions of the plugging cover with different opening pressures can be met, and the one-step processing forming of the flat-bottom plugging cover and the weakening groove can be realized by utilizing stamping equipment; or through the wall thickness compensation calculation of the blocking cover, the spinning thinning amount is considered in advance when raw materials are prepared, the blocking cover is manufactured through spinning forming, then petal nicks (namely weakening grooves are a plurality of radial grooves which are uniformly distributed along the circumferential direction) are formed through a pre-designed indentation disc, the spinning forming of the blocking cover can be realized, the two schemes can be parallel, and the requirements of different types of production scales can be met.
The invention provides two forming schemes, the processing efficiency is high, the single piece processing by adopting the one-time punch forming scheme takes about 6 minutes (including the time for installing and debugging the die), and the utilization rate of raw materials can reach 90 percent; the spinning and punch forming are adopted, the single piece processing takes about 10 minutes, and the utilization rate of raw materials is about 92%.
Drawings
Fig. 1 is a schematic view of a flat bottom closure with a weakened groove.
Fig. 2 is a schematic view of an integral molding die.
Fig. 3 is a schematic view of a female mold.
FIG. 4 is a schematic view of a spacer shim.
Fig. 5 is a schematic view of the indentation disc structure.
FIG. 6 is a schematic view of a binder structure.
Figure 7 is a schematic view of the male mold.
Fig. 8 is a schematic view of a die shank.
Fig. 9 is a schematic view of a spinning wheel.
Description of reference numerals: the die comprises a die body 1, an auxiliary adjusting mechanism 2, an adjusting gasket 3, an indentation disc 4, a hexagon socket screw 5, a blank holder 6, a male die 7, a hexagon socket set screw 8, a die handle 9 and a spinning wheel 10.
Detailed Description
The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like, indicate orientations and positional relationships based on those shown in the drawings, and are used only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be considered as limiting the present invention.
As shown in FIG. 1, the thin-wall flat-bottom plug cover with weakening grooves has a planar bottom, and the thickness of the circumferential wall surface is greater than that of the planar bottom; the bottom surface of blanking cover is opened has the weakening groove, the weakening groove is a plurality of radial grooves along circumference equipartition.
As shown in fig. 2, a forming mold for a thin-wall flat-bottom plug cover with a weakening groove comprises a female mold 1, an auxiliary adjusting mechanism 2, an indentation disc 4, a blank holder 6, a male mold 7 and a mold handle 9; the female die 1 is positioned below, a step blind hole is formed in the central axis of the female die, and the auxiliary adjusting mechanism 2 is coaxially arranged at the bottom of the step blind hole of the female die 1 and used for adjusting the depth in the female die blind hole; the indentation disc 4 is coaxially arranged above the auxiliary adjusting mechanism 2 through an adjusting gasket 3; the inner peripheral surface structure of the upper part of the step blind hole of the female die 1 is the same as the outer peripheral surface structure of the blanking cover;
the auxiliary adjusting mechanism 2 is of a spring type telescopic structure, and can adjust the longitudinal height through spring deformation, so that the depth of the blind hole of the female die is further changed.
The indentation disc 4 is a circular plate structure, a plurality of radial protrusions are uniformly distributed on the upper end surface of the indentation disc along the circumferential direction, correspond to the weakening grooves of the blocking cover, and are used for forming dies of the weakening grooves.
The blank holder 6 is of an annular structure, the inner diameter of the blank holder is equal to the outer diameter of the opening end of the blocking cover, the outer diameter of the blank holder is larger than the outer diameter of the blocking cover blank, and the blank holder is coaxially and fixedly arranged above the female die 1 through an inner hexagon screw 5 and used for compressing the outer edge of the blocking cover blank;
the structure below the male die 7 is the same as the structure of the inner surface of the plug cover and is used for forming the plug cover, and the top of the male die is coaxially provided with a die handle 9 through an inner hexagonal set screw 8; and applying pressure to the die shank through a punching device, and further coaxially and sequentially pressing a male die 7 into the blank holder 6 and the female die 1 to complete the forming of the plugging cover.
Plugging cover forming scheme 1: integral punch forming by adopting special tool
The aluminum plate material is 1050A in an annealing state, the plate thickness is 3.0mm, and the specific implementation steps of the part are as follows:
step 1: the aluminum plate is subjected to standard re-inspection and then is blanked, and the specification is phi 300 multiplied by t 3.0;
step 2: placing the female die 1 on a working table of a stamping device, aligning the female die with the center of a main shaft of the device, and requiring that the end face runout of the female die 1 is not more than 0.02 mm;
and step 3: placing the indentation disc 4 on the positioning surface of the female die 1, and leveling to ensure that the end face runout of the indentation disc 4 is not more than 0.01 mm;
and 4, step 4: placing an aluminum plate on the upper end face of the female die 1, aligning a hole in the blank holder 6 with a corresponding threaded hole in the female die 1, assembling by using a screw, and fixing by tightening a torque wrench (tightening torque requires 60-80 N.m);
and 5: and (3) assembling the male die 7 and the die shank 9, and fixing the die shank 9 in a main shaft sliding block of the punching equipment.
Step 6: adjusting the position of the slide block to ensure that the distance between the zero line on the working surface of the male die 7 and the working surface on the female die groove is 12.5 mm;
and 7: coating punching oil on the working surfaces of the female die and the male die; stamping and forming;
and 8: removing the blank holder 6 and taking out the formed piece;
and step 9: turning and repairing a flanging, mounting the plug cover on the male die 7, tightly jacking by using a tail jacking disc, and repairing the flanging on a lathe to ensure the height of the plug cover to be 48;
step 10: and (5) checking and warehousing according to a design drawing.
Plug cover molding scheme 2: wall thickness compensation spinning forming and petal nicking stamping
The aluminum plate material is 1050A in an annealing state, the plate thickness is 3.5mm, and the specific implementation steps of the part are as follows:
step 1: the aluminum plate is subjected to standard re-inspection and then is blanked, and the specification is phi 300 multiplied by t 3.5;
step 2: mounting the male die 7 on spinning equipment, aligning with the center of a main shaft of the equipment, and requiring that the jumping quantity of the end face and the excircle of the male die 7 is not more than 0.03 mm;
and step 3: placing an aluminum plate on the end face of the male die 7, and pressing the aluminum plate by using a tail top disc;
and 4, step 4: bending and forming the plug cover, installing the R8 rotary wheel 10, and firstly bending and forming the plug cover according to the following parameters: the rotating speed of the main shaft is 180 +/-20 r/min, and the feed ratio is 1.5 +/-0.5 mm/r;
and 5: die pasting and spinning: the rotating speed of the main shaft is 180 +/-20 r/min, and the feeding ratio is 2 +/-1 mm/r;
step 6: trimming and shaping, and cutting off to ensure the height of the plugging cover to be 48;
and 7: assembling the blocking cover and the indentation disc 4, and placing the blocking cover on stamping equipment for pressing;
and 8: fixing the die handle 9 in a main shaft sliding block of the stamping equipment, and stamping petal nicks;
and step 9: and (5) checking and warehousing according to a design drawing.
The invention can realize one-time integral forming of the flat-bottom blanking cover with the weakening groove by designing a special tool and utilizing stamping equipment; the depth of the petal nicks can be adjusted through an adjusting structure and an adjusting gasket on the tool, and the requirements of different opening pressure on the working conditions of the plugging cover are met;
through wall thickness compensation calculation, spinning forming of the plugging cover can be realized by combining spinning equipment with a stamping nicking tool; different molding schemes can be selected according to the production scale;
compared with the traditional machining process, the process method has the advantage that the utilization rate of raw materials can be improved to more than 90% from the original 7%.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made in the above embodiments by those of ordinary skill in the art without departing from the principle and spirit of the present invention.
Claims (9)
1. A thin-wall flat-bottom plug cover with weakening grooves is characterized in that the bottom of the plug cover is of a planar structure, and the thickness of the circumferential wall surface is greater than that of the bottom plane; the method is characterized in that: the bottom surface of blanking cover is opened has the weakening groove, the weakening groove is a plurality of radial grooves along circumference equipartition.
2. A mold for forming a thin-walled flat-bottomed closure with a weakened groove according to claim 1, wherein: the device comprises a female die, an auxiliary adjusting mechanism, an indentation disc, a blank holder, a male die and a die handle; the auxiliary adjusting mechanism is coaxially arranged at the bottom of the female die step blind hole and is used for adjusting the depth in the female die blind hole; the indentation disc is coaxially arranged above the auxiliary adjusting mechanism through an adjusting gasket; the inner peripheral surface structure of the upper part of the stepped blind hole of the female die is the same as the outer peripheral surface structure of the blanking cover;
the blank holder is of an annular structure, the inner diameter of the blank holder is equal to the outer diameter of the opening end of the blocking cover, the outer diameter of the blank holder is larger than the outer diameter of the blocking cover blank, and the blank holder is coaxially and fixedly arranged above the female die through an inner hexagonal screw and used for compressing the outer edge of the blocking cover blank;
the structure below the male die is the same as the structure of the inner surface of the plug cover and is used for forming the plug cover, and the top of the male die is coaxially provided with a die handle through an inner hexagonal set screw; and applying pressure to the die handle through a punching device, and further coaxially and sequentially pressing the male die into the blank holder and the female die to complete the forming of the plug cover.
3. The mold for forming a thin-walled flat-bottomed closure with a weakened groove according to claim 2, wherein: the indentation disc is of a circular plate structure, and a plurality of radial protrusions are uniformly distributed on the upper end face of the indentation disc along the circumferential direction and correspond to the weakening grooves of the blocking cover.
4. A method of forming a thin-walled flat-bottomed closure with a weakened groove according to claim 1, wherein: the method comprises the following specific steps:
the method comprises the following steps: selecting a processing plate according to the product requirements, and rechecking chemical components and mechanical properties according to the performance requirements of raw materials;
step two: placing the female die on a working table surface of stamping equipment, and aligning the female die with the center of a main shaft of the stamping equipment; placing the indentation disc on a step positioning surface in a blind hole of the female die, and leveling the indentation disc;
step three: preparing and blanking a plate blank, namely firstly placing the plate blank on the upper end surface of the female die, and then fixing the blank holder on the upper end surface of the female die through a socket head cap screw; meanwhile, the male die and the die shank are assembled, and the die shank is fixed in a main shaft sliding block of the stamping equipment;
step four: debugging is carried out after the whole die is installed;
step five: performing stamping and die testing, and adjusting the assembly position of the die according to the actually measured indentation depth; the stamping requirements of different weakening depth blanking covers can be met by replacing the adjusting gaskets;
step six: and (4) completing the punch forming of the blocking cover, turning and repairing a flanging, detecting the size of the formed blocking cover and weakening the depth of the groove.
5. The method of forming a thin-walled flat-bottomed closure with a weakened groove according to claim 4, wherein: step one, selecting an aluminum alloy plate with the standard of GB/T3880.1-2012, wherein the material grade is 1050A in an annealing state.
6. The method of forming a thin-walled flat-bottomed closure with a weakened groove according to claim 4, wherein: and in the second step, the end face runout of the female die is not more than 0.02 mm.
7. The method of forming a thin-walled flat-bottomed closure with a weakened groove according to claim 4, wherein: and in the second step, the end face runout of the indentation disc is not more than 0.01 mm.
8. A method for forming the thin-walled flat-bottomed closure with a weakened groove according to claim 1, which comprises the following steps:
the method comprises the following steps: selecting a processing plate, and rechecking chemical components and mechanical properties according to the performance requirements of the raw materials;
step two: mounting the male die on spinning equipment, and aligning the male die with the center of a main shaft of the spinning equipment; placing the plate blank on the end face of the male die, and pressing the plate blank by using a tail top disc;
step three: the male die is screwed out of the blocking cover on spinning equipment by using a bending forming and die sticking spinning method;
step four: assembling the plug cover formed by spinning in the step three with the indentation disc, and punching a weakening groove by using the indentation disc;
step five: various dimensions and weakening groove depths were examined.
9. The method of forming a thin-walled flat-bottomed closure with a weakened groove according to claim 8, wherein: and in the second step, the end face and excircle runout of the male die are not more than 0.03 mm.
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| CN202010828167.2A CN112024683A (en) | 2020-08-17 | 2020-08-17 | Thin-wall flat-bottom plug cover with weakening groove and forming mold and method thereof |
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| CN202010828167.2A CN112024683A (en) | 2020-08-17 | 2020-08-17 | Thin-wall flat-bottom plug cover with weakening groove and forming mold and method thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113305214A (en) * | 2021-05-31 | 2021-08-27 | 四川航天长征装备制造有限公司 | Die for processing weakening groove of plugging part |
| CN115740965A (en) * | 2022-11-01 | 2023-03-07 | 北京智创联合科技股份有限公司 | Method for manufacturing rocket engine combustion chamber with integral structure |
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Application publication date: 20201204 |