CN103008476A - Mould for cold deformation strengthening of annular non-magnetic steel forge piece and use method thereof - Google Patents
Mould for cold deformation strengthening of annular non-magnetic steel forge piece and use method thereof Download PDFInfo
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- CN103008476A CN103008476A CN201210582952XA CN201210582952A CN103008476A CN 103008476 A CN103008476 A CN 103008476A CN 201210582952X A CN201210582952X A CN 201210582952XA CN 201210582952 A CN201210582952 A CN 201210582952A CN 103008476 A CN103008476 A CN 103008476A
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Abstract
The invention discloses a mould for cold deformation strengthening of an annular non-magnetic steel forge piece and a use method thereof. The mould comprises a cold expansion mould and a cold compression mould, wherein the cold expansion mould comprises an upper stamping die and a lower stamping die; the upper stamping die, the lower stamping die and an inner hole of the annular non-magnetic steel forge piece are matched with each other and define a closed cavity; the upper stamping die is used for bearing a pressing machine for performing the stamping operation; the cold pressing mould comprises an upper pressing die and a lower pressing die; the upper pressing die, the lower pressing die and the outer side of the annular non-magnetic steel forge piece are matched with each other; a core rod matched with the inner hole of the annular non-magnetic steel forge piece is arranged in the inner hole of the annular non-magnetic steel forge piece; and the upper pressing die is used for bearing the pressing machine for performing the stamping operation. The method for using the mould comprises the steps as follows: 1, carrying out cold expansion on the annular non-magnetic steel forge piece from inside to outside until a set size is obtained; and 2, carrying out outside cold pressing on the annular non-magnetic steel forge piece until a set size is obtained. The mould has a simple use method, is convenient to operate, safe and reliable, and can meet the mechanical performance requirements of the annular non-magnetic steel forge piece.
Description
Technical field
The present invention relates to the forging of a kind of Turbo-generator Set or used in nuclear power station, particularly the cold deformation strengthening of a kind of annular nonmagnetic steel forging is with mould and using method.
Background technology
Retaining ring is one of critical piece of Turbo-generator Set, is sleeved on two ends of rotor section, it to the rotor tip winding play fixing, protect, prevent distortion, displacement and wobbler action.Retaining ring bear rotor winding overhang and the huge centrifugal force of self, bending stress and hot jacket stress etc. must prevent also that simultaneously rotor tip from affecting electric efficiency because leakage field causes loss.It is the Turbo-generator Set the highest parts that meet with stresses.In order to guarantee the safe handling of unit, require retaining ring that sufficiently high intensity and plasticity index, uniform mechanical property and minimum residual stress will be arranged, and have low magnetic or nonmagnetic.The retaining ring that possesses above condition must be made with the austenitic nonmagnetic steel material, because without the transformed austenite steel, can not improve its intensity by traditional material heat treatment mode, can only achieve the goal by the cold deformation strengthening of material, cold deformation strengthening is when the profile of workpiece is elongated or flattens, the shape of its inner crystal grain also is elongated thereupon or flattens, cause the lattice distorted, the resistance of the further slippage of metal is increased, therefore intensity and the hardness of metal significantly improve, plasticity and toughness obviously descend, and produce so-called " deformation strengthening " phenomenon.
The cold deformation strengthening of existing Retaining Ring Steel generally is to adopt high pressure to carry out from inside to outside " bulging " to strengthen.Chinese patent application numbers 201020666961.3, Granted publication CN201918820U disclose a kind of utility model: a kind of Nonmagnetic steel motor guard ring.Be provided with counterdie 04 and patrix 01 for the low temperature cold deformation processing in this utility model motor retaining ring 02; between described patrix 01 and counterdie 04, also be provided with protective layer 03; its counterdie 04 is the annular solid that is spliced by several modules; the outer shroud of annular solid is that circular interior ring is polygon; the outer shroud of annular solid cooperates with the inner surface of motor retaining ring 02; the inner surface of annular solid cooperates with the outer surface of protective layer 03, protects 03 layer inner surface to cooperate with the outer surface of patrix 01.Although this utility model has been added protective layer 03 between counterdie 04 and patrix 01; this protective layer 03 can be kept apart counterdie 04 and patrix 01; and in the process of extruding, played the effect of lubrication assistant; can efficiently retaining ring be carried out cold deformation strengthening smoothly, improve the deflection of cold plasticity distortion.But the inboard deflection of this retaining ring 02 is large than the outside, when the reaching mechanical performance index and meet design requirement of retaining ring inboard, the deflection in its outside is not enough, causes the mechanical property in the outside in the retaining ring to differ greatly, and this cold deformation strengthening method also is difficult to satisfy the mechanical property requirements of retaining ring; And the annular solid that counterdie 04 is spliced for several modules, along with the expansion of motor retaining ring 02 inside dimensions, the separation of module also can appear in counterdie 04, and motor retaining ring 04 inboard is in continuing cold expansion process, pressurized is inhomogeneous, affects easily the precision of motor retaining ring 02 inside dimensions.
Summary of the invention
The object of the invention is to overcome existing above-mentioned deficiency in the prior art, provide the cold deformation strengthening of a kind of annular nonmagnetic steel forging with mould and using method.
In order to realize the foregoing invention purpose, the invention provides following technical scheme:
A kind of annular nonmagnetic steel forging cold deformation strengthening mould, described mould comprise the cold expansion mould that described annular nonmagnetic steel forging endoporus is enlarged, and with the cold stamping die of described annular nonmagnetic steel forging reduced diameter.
Preferably, described cold expansion mould comprises at least one cover punch die, and wherein every cover punch die comprises upper trimming die and lower punch die, and described upper trimming die, lower punch die and described annular nonmagnetic steel forging endoporus cooperatively interact, and surrounding a closed cavity, described upper trimming die carries the press punching press.
Preferably, described cold stamping die comprises top die and dip mold, and described top die, dip mold and the annular nonmagnetic steel forging outside cooperatively interact, and described annular nonmagnetic steel forging endoporus is provided with the plug that cooperatively interacts with it, the punching press of described top die carrying press.
Preferably, the described upper trimming die, the lower punch die that cooperatively interact with annular nonmagnetic steel forging endoporus are truncated cone-shaped, and the round platform small end of described upper trimming die, lower punch die embeds respectively described annular nonmagnetic steel forging endoporus.
The upper trimming die of truncated conical shape, lower punch die not only can increase the seal that forms annular nonmagnetic steel forging cavity, and be convenient to press upper trimming die, undershoot are molded into annular nonmagnetic steel forging endoporus, be convenient to simultaneously upper trimming die after the complete pressure release of cold expansion, lower punch die disassembles from annular nonmagnetic steel forging.
Preferably, described top die surface, the dip mold that cooperatively interacts with the annular nonmagnetic steel forging outside be surperficial to be inner concave arc surface.
Preferably, interconnect by bearing spring between described top die, the dip mold.
Top die surface, dip mold surface design are inner concave arc surface, increased the contact area in top die, dip mold and the annular nonmagnetic steel forging outside, the bearing spring that arranges between top die, the dip mold can make the more steady of annular nonmagnetic steel forging clamping, top die, the dip mold annular nonmagnetic steel forging of extruding that can keep being parallel to each other when bearing press and press down, distortion is more even when being beneficial to annular nonmagnetic steel forging and colding pressing.
A kind of annular nonmagnetic steel forging cold deformation strengthening mold use method may further comprise the steps:
Step 2, annular nonmagnetic steel forging is carried out the outside at described cold stamping die cold pressing, described annular nonmagnetic steel forging is placed between top die, the dip mold in the sleeping mode of putting, described top die, dip mold and the annular nonmagnetic steel forging outside cooperatively interact, described annular nonmagnetic steel forging endoporus is inserted with the plug that cooperatively interacts with it, the punching press of described top die carrying press is controlled the described annular nonmagnetic steel forging external diameter deflection of colding pressing and is reached the process stipulation dimensional requirement.
Annular nonmagnetic steel forging endoporus, upper trimming die, lower punch die complement each other to form the cavity of sealing, be provided with superhigh pressure liquid in the cavity, under the effect of press crunch, upper trimming die, lower punch die then push annular nonmagnetic steel forging endoporus in opposite directions, cavity will diminish, also corresponding diminishing and produce super-pressure of the superhigh pressure liquid volume in the cavity then, the super-pressure meeting reverse extrusion annular nonmagnetic steel forging that this liquid produces, thereby impel annular nonmagnetic steel forging diameter of bore outwards to become large, and whole annular nonmagnetic steel volume is certain, and corresponding height can diminish; By the drafts of control press, realize the deflection that the annular nonmagnetic steel forging diameter of bore of control outwards enlarges.Impel the annular nonmagnetic steel forging Internal Hole Deformation can be more even by superhigh pressure liquid, annular nonmagnetic steel forging endoporus is less, the forging wall thickness is thicker, needed distortion pressure can be larger, in cold expansion die deformation process, the change of annular nonmagnetic steel forging diameter of bore is large at any time, in order better to guarantee precision, the cold expansion mould that can change different sizes mates with annular nonmagnetic steel forging endoporus.
Carrying out annular nonmagnetic steel forging when colding pressing with top die, dip mold, for annular nonmagnetic steel forging profile cold pressing evenly, control the deflection that annular nonmagnetic steel forging is colded pressing by the drafts of press, and after a period of time of whenever colding pressing, rotate annular nonmagnetic steel forging and cold pressing again, the deflection of its profile is kept evenly; Simultaneously for fear of destroying the cold annular nonmagnetic steel forging endoporus that diffuses into the regulation process, adaptive in annular nonmagnetic steel forging endoporus have a plug, when treating that annular nonmagnetic steel forging external diameter is colded pressing to the regulation process, plug dismounting with endoporus gets final product again, can it be disassembled from annular nonmagnetic steel forging by press when removing plug.
Preferably, described superhigh pressure liquid medium is water.
Superhigh pressure liquid is selected common water, water is under the effect of press crunch, at upper trimming die, the confined space that lower punch die and annular nonmagnetic steel forging endoporus surround makes the cold expansion of annular nonmagnetic steel forging endoporus owing to smaller volume produces super-pressure, the size of this hyperpressure can be selected according to the size that size and the press of annular nonmagnetic steel forging are exerted pressure, its maximum can reach 6000-7000 atmospheric pressure, can reach the needed pressure of annular nonmagnetic steel forging Internal Hole Deformation fully, and water can not damage or corrode annular nonmagnetic steel forging in cold expansion process, cost is also cheap.
Preferably, if described annular nonmagnetic steel forging endoporus profiled holes, such as shoulder hole, then first annular nonmagnetic steel forging endoporus is processed into circular hole and leaves certain surplus, carry out again described from inside to outside cold expansion and the described outside and cold pressing, at last described annular nonmagnetic steel forging manhole is processed into required profiled holes.
If the annular nonmagnetic steel forging that is processed into the endoporus with section groove is directly carried out from inside to outside cold expansion and cold pressing in the outside, then the annular nonmagnetic steel forging after the cold deformation is because wall thickness is not identical, cause easily annular nonmagnetic steel forging distortion inhomogeneous, can not satisfy required process, and the mechanical property of inside and outside sidewall thickness diverse location differ also can be very large; And first annular nonmagnetic steel forging endoporus is processed into manhole and leaves certain surplus, carrying out described from inside to outside cold expansion and the described outside colds pressing again, at last described annular nonmagnetic steel forging circular hole processing excision is become required profiled holes more than surplus, its excision circular hole surplus can't affect the mechanical property requirements such as its desirable strength, hardness.
Compared with prior art, beneficial effect of the present invention:
A kind of annular nonmagnetic steel forging of the present invention cold deformation strengthening is with mould and using method, cold pressing by annular nonmagnetic steel forging being carried out successively carry out again the outside after the from inside to outside cold expansion, inboard deflection is suitable with outside deflection, can satisfy the mechanical property requirements of annular nonmagnetic steel forging; And the method does not need to establish protective layer and annular solid counterdie, and method is simple, easy to operate, safe and reliable.
Description of drawings:
Fig. 1 is the structural representation of existing Nonmagnetic steel motor guard ring mould.
Fig. 2 is the schematic top plan view of existing Nonmagnetic steel motor guard ring, counterdie and protective layer.
Fig. 3 is annular nonmagnetic steel forging of the present invention when cold expansion from inside to outside and cold expansion mould fit structure schematic diagram (wherein the nonmagnetic steel forging is cutaway view).
Fig. 4 is the from inside to outside cold structural representation (wherein the nonmagnetic steel forging is cutaway view) that expands to the given size of annular nonmagnetic steel forging endoporus of the present invention.
Fig. 5 is that the annular nonmagnetic steel forging of the present invention outside is when colding pressing and cold stamping die fit structure schematic diagram.
Fig. 6 is the finished product cutaway view annular nonmagnetic steel forging of the present invention is processed as required profiled holes after by cold deformation strengthening after.
Mark among the figure:,
01, patrix, 02, the motor retaining ring, 03, protective layer, 04, counterdie.
1, annular nonmagnetic steel forging, 201, upper trimming die, 202, lower punch die, 3, superhigh pressure liquid, 401, top die, 402, dip mold, 5, bearing spring, 6, plug, 7, shoulder hole.
The specific embodiment
The present invention is described in further detail below in conjunction with test example and the specific embodiment.But this should be interpreted as that the scope of the above-mentioned theme of the present invention only limits to following embodiment, all technology that realizes based on content of the present invention all belong to scope of the present invention.
Shown in Fig. 3-5, a kind of annular nonmagnetic steel forging cold deformation strengthening mould, described mould comprise the cold expansion mould that described annular nonmagnetic steel forging 1 endoporus is enlarged, and with the cold stamping die of described annular nonmagnetic steel forging 1 reduced diameter.Wherein cold expansion mould comprises at least one cover punch die, wherein every cover punch die comprises upper trimming die 201 and lower punch die 202, described upper trimming die 201, lower punch die 202 cooperatively interact with described annular nonmagnetic steel forging 1 endoporus, and surround a closed cavity, described upper trimming die 201 carrying press punching presses; Wherein cold stamping die comprises top die 401 and dip mold 402, described top die 401, dip mold 402 cooperatively interact with annular nonmagnetic steel forging 1 outside, described annular nonmagnetic steel forging 1 endoporus is provided with the plug 6 that cooperatively interacts with it, described top die 401 carrying press punching presses.
The upper trimming die 2001, the lower punch die 202 that cooperatively interact with annular nonmagnetic steel forging 1 endoporus among the present invention are truncated cone-shaped.Because the upper trimming die of truncated conical shape 201, lower punch die 202 not only can increase the seal that forms annular nonmagnetic steel forging 1 cavity, and be convenient to press upper trimming die 201, lower punch die 202 are pressed into annular nonmagnetic steel forging 1 endoporus, be convenient to simultaneously upper trimming die 201 after the complete pressure release of cold expansion, lower punch die 202 disassembles from annular nonmagnetic steel forging 1.
For top die 401, dip mold 402 more steady with annular nonmagnetic steel forging 1 clamping, it is more reliable to cold pressing, be that inner concave arc surface and the bearing spring 5 that arranges between the two interconnect with top die 401 surfaces, dip mold 402 surface design, inner concave arc surface can increase the contact area in top die 401, dip mold 402 and annular nonmagnetic steel forging 1 outside, top die 401, the dip mold 402 annular nonmagnetic steel forging 1 of extruding that can keep being parallel to each other when bearing press and press down, distortion is more even when being beneficial to annular nonmagnetic steel forging 1 and colding pressing.
A kind of annular nonmagnetic steel forging cold deformation strengthening mold use method may further comprise the steps:
Step 2, annular nonmagnetic steel forging 1 is carried out the outside cold pressing, control the described annular nonmagnetic steel forging 1 external diameter deflection of colding pressing and reach the process stipulation dimensional requirement.
Wherein, when annular nonmagnetic steel forging 1 carries out from inside to outside cold expansion in the step 1, annular nonmagnetic steel forging 1 vertically is placed between lower punch die 202 and the upper trimming die 201, annular nonmagnetic steel forging 1 endoporus, upper trimming die 201, lower punch die 202 cooperatively interact, and surround a cavity, be provided with superhigh pressure liquid 3 in the cavity, upper trimming die 201 carrying press punching presses.Under the effect of press crunch, upper trimming die 201,202 of lower punch dies push annular nonmagnetic steel forging 1 endoporus in opposite directions, cavity will diminish, also corresponding diminishing and produce super-pressure of superhigh pressure liquid 3 volumes in the cavity then, the super-pressure meeting reverse extrusion annular nonmagnetic steel forging 1 that this liquid 3 produces, thereby impel annular nonmagnetic steel forging 1 diameter of bore outwards to become large, corresponding height can diminish; By the drafts of control press, realize the deflection that annular nonmagnetic steel forging 1 diameter of bore of control outwards enlarges.
When annular nonmagnetic steel forging 1 is colded pressing in the step 2, described forging 1 is placed between top die 401, the dip mold 402 in the sleeping mode of putting, top die 401, dip mold 402 cooperatively interact with annular nonmagnetic steel forging 1 outside, top die 401 carrying press punching presses.For annular nonmagnetic steel forging 1 profile cold pressing evenly, control the deflection that annular nonmagnetic steel forging 1 is colded pressing by the drafts of press, and after a period of time of whenever colding pressing, rotate annular nonmagnetic steel forging 1 and cold pressing again, the deflection of its profile is kept evenly; Simultaneously for fear of destroying cold annular nonmagnetic steel forging 1 endoporus that diffuses into the regulation process, adaptive in annular nonmagnetic steel forging 1 endoporus have a plug 6, when treating that annular nonmagnetic steel forging 1 external diameter is colded pressing to the regulation process, plug 6 dismountings with endoporus get final product again.
Impel annular nonmagnetic steel forging 1 Internal Hole Deformation can be more even by superhigh pressure liquid 3, annular nonmagnetic steel forging 1 endoporus is less, the forging wall thickness is thicker, needed distortion pressure can be larger, in cold expansion die deformation process, the change of annular nonmagnetic steel forging 1 diameter of bore is large at any time, in order better to guarantee precision, the cold expansion mould that can change different sizes mates with annular nonmagnetic steel forging 1 endoporus.For example external diameter be 600mm, internal diameter be 200mm, highly for the endoporus of the annular nonmagnetic steel forging 1 of 600mm from the cold 350mm that diffuses into of 200mm, experiment show its endoporus in cold expansion process gradually in order to keep coupling and the sealing effectiveness of cold expansion mould and endoporus, need to change five of different sizes and overlap cold expansion moulds.Superhigh pressure liquid 3 is chosen as water, and the water maximum can reach 6000-7000 atmospheric pressure, can satisfy the required pressure of the annular cold expansion of nonmagnetic steel forging 1 endoporus, and water can not damage or corrode annular nonmagnetic steel forging 1 in cold expansion process, and common water cost is also cheap.
In addition, when annular nonmagnetic steel forging endoporus is not regular circular port, but during profiled holes, such as shoulder hole 7, as shown in Figure 6, if the annular nonmagnetic steel forging 1 that is processed into the endoporus with section groove is directly carried out from inside to outside cold expansion and cold pressing in the outside, then the annular nonmagnetic steel forging after the cold deformation 1 is because wall thickness is not identical, cause easily 1 distortion of annular nonmagnetic steel forging inhomogeneous, can not satisfy required process, and the mechanical property of inside and outside sidewall thickness diverse location differ also can be very large; And first annular nonmagnetic steel forging 1 endoporus is processed into manhole and leaves certain surplus, carrying out from inside to outside cold expansion and the outside colds pressing again, at last annular nonmagnetic steel forging circular hole processing excision is become required profiled holes more than surplus, the shoulder hole shown in 67 as shown, its excision circular hole surplus can't affect the mechanical property requirements such as its desirable strength, hardness.The mechanical property requirements such as its intensity, hardness can detect by the test portion district that annular nonmagnetic steel forging 1 leaves along the two ends of short transverse.
A kind of annular nonmagnetic steel forging of the present invention cold deformation strengthening is with mould and using method, do not need by protective layer being set and the annular solid counterdie carries out cold deformation strengthening, cold pressing but directly annular nonmagnetic steel forging is carried out successively carrying out again the outside after the from inside to outside cold expansion, namely can satisfy the mechanical property requirements of annular nonmagnetic steel forging; Method is simple, easy to operate, safe and reliable.
Claims (9)
1. an annular nonmagnetic steel forging cold deformation strengthening mould is characterized in that, described mould comprises the cold expansion mould that described annular nonmagnetic steel forging (1) endoporus is enlarged, and with the cold stamping die of described annular nonmagnetic steel forging (1) reduced diameter.
2. a kind of annular nonmagnetic steel forging cold deformation strengthening mould according to claim 1, it is characterized in that, described cold expansion mould comprises at least one cover punch die, wherein every cover punch die comprises upper trimming die (201) and lower punch die (202), described upper trimming die (201), lower punch die (202) cooperatively interacts with described annular nonmagnetic steel forging (1) endoporus, described annular nonmagnetic steel forging (1) endoporus and described upper trimming die (201), lower punch die (202) surrounds a closed cavity, the punching press of described upper trimming die (201) carrying press.
3. a kind of annular nonmagnetic steel forging cold deformation strengthening mould according to claim 1 and 2, it is characterized in that, described cold stamping die comprises top die (401) and dip mold (402), described top die (401), dip mold (402) cooperatively interact with annular nonmagnetic steel forging (1) outside, described annular nonmagnetic steel forging (1) endoporus is inserted with the plug (6) that cooperatively interacts with it, the punching press of described top die (401) carrying press.
4. a kind of annular nonmagnetic steel forging cold deformation strengthening mould according to claim 2, it is characterized in that, the described upper trimming die (201), the lower punch die (202) that cooperatively interact with annular nonmagnetic steel forging (1) endoporus are truncated cone-shaped, and the round platform small end of described upper trimming die (201), lower punch die (202) embeds respectively described annular nonmagnetic steel forging (1) endoporus.
5. a kind of annular nonmagnetic steel forging cold deformation strengthening mould according to claim 3, it is characterized in that described top die (401) surface, dip mold (402) surface that cooperatively interact with annular nonmagnetic steel forging (1) outside are inner concave arc surface.
6. a kind of annular nonmagnetic steel forging cold deformation strengthening mould according to claim 5 is characterized in that, interconnects by bearing spring (5) between described top die (401), the dip mold (402).
7. annular nonmagnetic steel forging cold deformation strengthening mold use method is characterized in that, may further comprise the steps:
Step 1, annular nonmagnetic steel forging (1) is carried out from inside to outside cold expansion at described cold expansion mould, being about to annular nonmagnetic steel forging (1) vertically is placed between described upper trimming die (201) and the lower punch die (202), described annular nonmagnetic steel forging (1) endoporus, upper trimming die (201), lower punch die (202) cooperatively interacts, and surround a cavity, superhigh pressure liquid (3) is housed in the described cavity, the punching press of described upper trimming die (201) carrying press is controlled the cold expansion deflection of described annular nonmagnetic steel forging (1) endoporus and is reached the process stipulation size;
Step 2, annular nonmagnetic steel forging (1) is carried out the outside at described cold stamping die colds pressing, described annular nonmagnetic steel forging (1) is placed on described top die (401) in the sleeping mode of putting, between the dip mold (402), described top die (401), dip mold (402) cooperatively interacts with annular nonmagnetic steel forging (1) outside, described annular nonmagnetic steel forging (1) endoporus is inserted with the plug (6) that cooperatively interacts with it, the punching press of described top die (401) carrying press is controlled described annular nonmagnetic steel forging (1) the external diameter deflection of colding pressing and is reached the process stipulation dimensional requirement.
8. a kind of annular nonmagnetic steel forging according to claim 7 cold deformation strengthening mold use method is characterized in that, described superhigh pressure liquid (3) medium is water.
9. according to claim 7 or 8 described a kind of annular nonmagnetic steel forging cold deformation strengthening mold use methods, it is characterized in that, described annular nonmagnetic steel forging (1) is if the endoporus profiled holes, such as shoulder hole (7), then first annular nonmagnetic steel forging (1) endoporus is processed into circular hole and leaves certain surplus, carry out again described from inside to outside cold expansion and the described outside and cold pressing, at last described annular nonmagnetic steel forging (1) circular hole is processed into required profiled holes.
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| CN111618529A (en) * | 2020-04-23 | 2020-09-04 | 陕西斯瑞新材料股份有限公司 | Manufacturing method of CuNi90/10 alloy socket welding flange |
| CN113178540A (en) * | 2021-04-13 | 2021-07-27 | 贵州梅岭电源有限公司 | Method for improving flatness of thermal battery sheet |
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| CN111618529A (en) * | 2020-04-23 | 2020-09-04 | 陕西斯瑞新材料股份有限公司 | Manufacturing method of CuNi90/10 alloy socket welding flange |
| CN113178540A (en) * | 2021-04-13 | 2021-07-27 | 贵州梅岭电源有限公司 | Method for improving flatness of thermal battery sheet |
| CN113178540B (en) * | 2021-04-13 | 2022-07-29 | 贵州梅岭电源有限公司 | Method for improving flatness of thermal battery slice |
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