A fine blanking process method for compressor intermediate plate

Abstract

The present invention discloses a fine blanking process method for a compressor intermediate plate blank, which is characterized in that it includes the following processes: material preparation → stamping → turning the outer circle → drilling small holes → double-sided grinding → cleaning → full inspection and packaging; wherein, the fine blanking process includes the use of a special composite mold, and the special composite mold includes an upper mold component and a lower mold component that are relatively arranged up and down; both the upper mold component and the lower mold component adopt a relatively scientific and reasonable structure to realize the synchronous processing of key holes and the shape. Its advantages are: it saves two processes of heating and correction, and the drilling process reduces the processing amount of 7 holes, greatly reduces and simplifies the processing process, reduces production costs, improves efficiency, and improves product quality; the key holes are processed synchronously with the shape, and no secondary positioning is required, there is no accumulated error, the shape and position dimensions are more stable, and the product yield is greatly improved; the consumption of materials and energy is greatly reduced, energy saving and environmental protection; it also solves the problem that the φ7 and φ9 holes have small margins and are difficult to form.

Description

Technical Field

[0001] The invention relates to the technical field of compressors, and in particular to a processing technology for a compressor intermediate plate. Background Art

[0002] The compressor middle plate is generally a circular or quasi-circular structure, and is often used in compressors of air conditioners and large freezers. Figure 1 As shown, the compressor middle plate is generally a cylindrical structure, with a φ31.2 hole in the middle of the axial direction, and several holes are set around the φ31.2 hole near the edge of the compressor middle plate, such as 5 φ7 holes, 2 φ9.5 holes, and 2 φ3 holes. The minimum hole margin between these holes and the edge of the compressor middle plate is 2.7 mm, and the size error range of the hole position is required to be less than 0.2 mm, and the vertical size error range is required to be less than 0.1 mm. The precision requirement is relatively high; and due to the working conditions, the hardness of the parts must reach HRB85-105. It is difficult to meet these precision requirements using conventional machining processes. In order to meet the above requirements, the manufacture of the compressor middle plate often adopts traditional forging processes. The entire process is as follows: material preparation → heating → die forging → turning the outer circle → drilling 9 holes → double-sided grinding → heat treatment → cleaning → calibration → full inspection and packaging. The traditional forging process for the compressor intermediate plate has the following defects: (1) There are many processing steps and the processing process is relatively complicated; (2) The hole and the shape are processed separately. Due to the need for secondary positioning, cumulative errors are caused, resulting in poor dimensional stability of the hole position. In addition, the minimum margin of φ7 and φ9 holes is only 2.7 mm, which makes it more difficult to form. The scrap rate is high and it is difficult to ensure the reliable and stable forming of the finished product; (3) The material and energy consumption is large, which is not conducive to energy conservation and environmental protection, resulting in high production costs and low efficiency. Summary of the invention

[0003] In order to solve the above-mentioned technical problems existing in the existing processing method of the compressor intermediate plate, the present invention provides a fine blanking process method for the compressor intermediate plate.

[0004] To achieve the above object, the technical solution adopted by the present invention is:

[0005] A fine blanking process for a compressor intermediate plate blank, characterized in that it includes the following processes: material preparation → stamping → turning the outer circle → drilling small holes → double-sided grinding → cleaning → full inspection and packaging; wherein,

[0006] The stamping process includes the following steps:

[0007] Step 1, feeding, conveying the stamping sheet material into a special composite die of the stamping machine, wherein the special composite die comprises an upper die assembly and a lower die assembly arranged opposite to each other, and the stamping sheet material passes through between the upper die assembly and the lower die assembly;

[0008] Step 2: Pressing the material, the special composite mold is closed to press the stamping sheet;

[0009] Step 3, fine punching, the punching machine drives the lower die assembly and the upper die assembly to punch the punching sheet to punch holes and blank the sheet;

[0010] Step 4, opening the mold, the punching machine drives the lower mold assembly and the upper mold assembly to separate;

[0011] Step 5, discharging, the punching machine drives the lower die assembly and the upper die assembly to respectively eject the compressor intermediate plate blank and the stamping waste obtained by stamping;

[0012] In the outer circle turning process, the outer circle of the compressor intermediate plate blank is smoothed and finished on the machine tool;

[0013] In the small hole drilling process, two φ3 holes with relatively small hole diameters are drilled at designated positions on the compressor intermediate plate blank on the machine tool;

[0014] In the double-sided grinding process, the upper and lower surfaces of the compressor intermediate plate blank are polished and polished;

[0015] During the cleaning process, the compressor intermediate plate blank is fully processed to obtain the finished compressor intermediate plate.

[0016] Furthermore, the upper mold assembly includes an upper mold plate, an upper fixing plate, an upper pad, a male and female mold, a φ7 hole upper ejector rod I, a φ9.5 hole upper ejector rod I, a φ7 hole upper ejector rod II, a φ9.5 hole upper ejector rod II, a φ31.2 hole upper ejector rod I, and a φ31.2 hole upper ejector rod II; wherein,

[0017] An upper mold plate, used to carry the aforementioned components in the upper mold assembly, and installed above the lower mold assembly;

[0018] An upper pad is detachably disposed under the upper mold plate to protect the upper mold plate and withstand the force transmitted from the male and female molds;

[0019] An upper fixing plate is detachably arranged under the upper pad and used to fix the male and female dies. The upper fixing plate is provided with male and female die holes for fixing the male and female dies.

[0020] The male and female dies are detachably arranged under the upper fixed plate, and the upper outer sides of the male and female dies are fixed to the male and female die holes on the upper fixed plate for stamping the shape of the compressor intermediate plate blank, and the shape of the male and female dies matches the shape of the compressor intermediate plate blank; in step 3, the punching machine controls the upper template, the upper pad, the upper fixed plate and the male and female dies to remain motionless, and the punching machine controls the lower die assembly to stamp upward, and under the cooperation of the male and female dies and the lower die assembly, the compressor intermediate plate blank is punched out of the stamping sheet material to form;

[0021] A 1# middle through hole is provided in the middle of the male and female dies for the upper ejector rod II of the φ31.2 hole to move up and down, and the upper ejector rod II of the φ31.2 hole can be movably arranged in the 1# middle through hole; the upper template and the upper pad are both provided with middle coaxial through holes coaxially opposite to the 1# middle through hole, and the middle coaxial through holes correspond to the 11# through hole and the 12# through hole from top to bottom respectively; the upper ejector rod I of the φ31.2 hole can move up and down through the 10# through hole 71, the 20# through hole 91 and the 30# through hole 81 and is connected to the upper ejector rod II of the φ31.2 hole to form a whole; the upper end of the upper ejector rod I of the φ31.2 hole is connected to the punching machine, and in step 5, the punching machine controls the upper ejector rod I of the φ31.2 hole to press down, so as to drive the upper ejector rod II of the φ31.2 hole to eject the stamping waste obtained by the stamping in step 3 downward from the male and female dies;

[0022] There are several 2# ejector holes on the edges of the male and female molds. The ejector I on the φ7 hole and the ejector I on the φ9.5 hole can be movably arranged in their corresponding 2# ejector holes; the upper template, the upper pad, and the upper fixed plate are all provided with several groups of coaxial ejector holes coaxially opposite to each 2# ejector hole, and each group of coaxial ejector holes corresponds to the 21# ejector hole, the 22# ejector hole, and the 23# ejector hole from top to bottom; the ejector II on the φ7 hole and the ejector II on the φ9.5 hole can be movably passed through their corresponding 21# The ejector rod hole, the 22# ejector rod hole and the 23# ejector rod hole, the φ7 hole upper ejector rod I and the φ7 hole upper ejector rod II are connected as a whole, and the φ9.5 hole upper ejector rod I and the φ9.5 hole upper ejector rod II are connected as a whole; the upper ends of the φ7 hole upper ejector rod I and the φ9.5 hole upper ejector rod I are both connected to the punching machine, and in step 5, the punching machine controls the φ7 hole upper ejector rod I and the φ9.5 hole upper ejector rod I to press down, driving the φ7 hole upper ejector rod I and the φ9.5 hole upper ejector rod I to push the stamping waste obtained by stamping in step 3 downward from the male and female dies;

[0023] In step 2, the lower ends of the φ31.2 hole upper push rod II, the φ7 hole upper push rod II and the φ9.5 hole upper push rod II are all flush with the lower surfaces of the male and female dies and pressed on the upper surface of the stamping sheet.

[0024] Furthermore, the lower die assembly includes a lower die plate, a lower pad, a lower fixing plate, a die, a lower force transmission rod I, a lower force transmission rod II, a die insert, a back pressure plate, a φ31.2 round hole punch, a φ7 round hole punch and a φ9.5 round hole punch; wherein,

[0025] The lower mold plate is used to carry the aforementioned components in the lower mold assembly and is installed below the upper mold assembly;

[0026] A lower pad is detachably arranged on the upper surface of the lower mold plate, and is used to protect the lower mold plate and bear the force transmitted by each round hole punch;

[0027] A lower fixing plate is detachably arranged on the upper surface of the lower pad and is used to fix the concave die and all the round hole convex dies;

[0028] The concave die is detachably arranged on the upper side of the lower fixed plate, and the concave die is provided with an inserting through groove for accommodating the concave die insert;

[0029] The die insert is fixed in the through-insertion groove of the die, the upper surface of the die insert is flush with the upper surface of the die, and the die insert is provided with a stamping active hole which serves as a stamping forming groove of the compressor intermediate plate blank and a guide hole of the counter pressure plate;

[0030] The back pressure plate can be movably arranged in the punching movable hole of the die insert block, the height of the back pressure plate is less than the height of the punching movable hole, and a 3# middle through hole and a plurality of 4# convex holes are arranged on the back pressure plate; under normal conditions, the upper surface of the back pressure plate is exposed upward from the punching movable hole of the die insert block;

[0031] The lower dowel rod I is connected to the bottom of the back pressure plate. The lower fixed plate and the lower pad are both provided with lower dowel rod I holes for the lower dowel rod I to pass through downwards, which are 39# dowel rod I hole and 29# dowel rod I hole respectively;

[0032] The lower dowel rod II is connected to the lower end of the lower dowel rod I. The lower template is provided with a 30# lower dowel rod II hole for the lower dowel rod II 9 to pass downward.

[0033] φ31.2 round hole punch, used to punch the φ31.2 round hole on the middle plate blank of the compressor;

[0034] φ7 round hole punch, used to punch the φ7 round hole on the middle plate blank of the compressor;

[0035] φ9.5 round hole punch, used to punch the φ9.5 round hole on the middle plate blank of the compressor;

[0036] The position and specification of the 3# middle through hole match and correspond to the 1# middle through hole on the male and female dies, and the position, specification and quantity of the 4# male die hole match and correspond to the 2# ejector pin hole on the male and female dies;

[0037] The lower fixing plate and the lower pad are both provided with 31# middle through holes and 32# middle through holes coaxially opposite to the 3# middle through holes; the lower fixing plate and the lower pad are both provided with a plurality of groups of coaxial punch holes coaxially opposite to each 4# punch hole, and each group of coaxial punch holes corresponds to 41# punch hole and 42# punch hole from top to bottom;

[0038] The φ31.2 round hole punch can be movably inserted into the 32# middle through hole, 31# middle through hole, and 3# middle through hole in sequence, with the upper end flush with the upper surface of the die and the lower end detachably fixed on the lower pad;

[0039] The φ7 round hole punch and the φ9.5 round hole punch can be movably inserted into the corresponding 41# punch hole, 42# punch hole, and 4# punch hole in sequence, with the upper ends flush with the upper surface of the die, and the lower ends can be detachably fixed on the lower pad;

[0040] The lower end of the lower force transmission rod II is connected to the punching machine. In step 2, the upper surface of the counter-pressure plate and the upper end surfaces of the φ31.2 round hole punch, the φ7 round hole punch, and the φ9.5 round hole punch are kept flush with the upper surface of the die and pressed on the lower surface of the punched sheet;

[0041] In step 3, in the lower die assembly, the punch controls the lower force transfer rod II and the lower force transfer rod I to move downward, thereby driving the counter pressure plate downward, so that the upper surface height of the counter pressure plate is lower than the upper surface of the die insert, and the height difference between the two is greater than the thickness of the stamped sheet; at this time, the upper ends of the φ31.2 round hole punch, the φ7 round hole punch and the φ9.5 round hole punch are all kept flush with the upper surface of the die; in the upper die assembly, the punch controls and drives the φ31.2 hole upper push rod II, the φ7 hole upper push rod II and the φ9.5 hole upper push rod II to move upward, and the lower parts of each hole in the convex and concave dies are emptied;

[0042] In step 3, the upper template, the upper pad, the upper fixed plate and the male and female dies remain stationary, and the punching machine controls the lower template, the lower pad, the lower fixed plate and the female die to drive the counter-pressure plate to press upward together; the counter-pressure plate, in cooperation with the male and female dies, punches the compressor intermediate plate blank out of the stamping sheet and forms it in the stamping active hole; the φ31.2 round hole punch, the φ7 round hole punch and the φ9.5 round hole punch, in cooperation with the male and female dies, punch out φ31.2 holes, φ7 holes and φ9.5 holes in the compressor intermediate plate blank respectively;

[0043] In step 3, under the combined action of the punching of the counter-pressure plate and the top grids of the φ31.2 round hole punch, the φ7 round hole punch and the φ9.5 round hole punch, the stamping wastes corresponding to the holes punched out of the compressor intermediate plate blank enter the corresponding 1# intermediate through hole and 2# ejector rod hole in the convex and concave dies respectively;

[0044] In step 4, the punching machine drives the lower die assembly and the upper die assembly to separate, and the stamping waste is separated from the compressor intermediate plate blank obtained by stamping along with the male and female dies; the compressor intermediate plate blank is now located in the stamping active hole of the female die insert;

[0045] In step 5, in the lower die assembly, the punching machine controls the lower force transfer rod II and the lower force transfer rod I to reset upward, thereby driving the back pressure plate to reset upward, and ejecting the compressor intermediate plate blank obtained by stamping from the stamping active hole of the die insert, separating it from the upper surface of the back pressure plate, and also restoring the upper surface height of the back pressure plate to be flush with the upper surface of the die insert; in the upper die assembly, the punching machine controls and drives the φ31.2 hole upper ejector rod II, the φ7 hole upper ejector rod II and the φ9.5 hole upper ejector rod II to reset downward and eject the stamping waste in the male and female dies downward.

[0046] Furthermore, a guide plate is provided under the upper template, which can be movably suspended on the upper template by guide columns, and a guide groove is provided on the guide plate for the upper pad, upper fixed plate and male and female dies to move; a pressure plate is provided under the guide plate, which can be detachably fixed under the guide plate; a force transmission push rod is provided on the top of the pressure plate; the lower end of the force transmission push rod is fixed to the top of the pressure plate, and the upper end passes through the guide groove and the upper fixed plate, upper pad and upper template in sequence and can be movably extended from above the upper template; in step 2, the pressure plate presses the stamping sheet material in the lower die assembly; in step 3, the punching machine controls the force transmission push rod to move upward, driving the guide plate and the pressure plate to retract, thereby freeing up stamping activity space for the stamping sheet material; in step 5, the punching machine controls the force transmission push rod to move downward, driving the guide plate and the pressure plate to push down, and pushing the stamping sheet material stuck on the male and female dies after stamping downward.

[0047] Furthermore, a locking pin for guiding and positioning the die and the blank pressing plate is provided between the upper die assembly and the lower die assembly; the male pin of the locking pin is provided on the blank pressing plate, and the lower end of the male pin extends downward from the bottom of the blank pressing plate;

[0048] The spring female pin of the locking pin is vertically arranged on the lower template, the lower pad, the lower fixing plate, and the concave die, and the spring female pin and the male pin are matched and opposed to each other up and down; in step 2, the lower die assembly is controlled by the punching machine to move upward, and the locking pin is inserted into the spring female pin; conversely, in step 4, the lower die assembly moves downward and retracts, and the locking pin and the spring female pin are separated.

[0049] Furthermore, the die assembly formed by the die and the die insert has a pattern groove for storing oil on the upper surface of the die assembly on the feeding side, the shape of the pattern groove matches the shape of the lower surface of the compressor intermediate plate blank obtained by stamping, and the depth of the pattern groove is 0.3mm; when the stamping sheet is continuously stamped, the position of the subsequent sheet to be stamped just falls on the pattern groove; the lower surface of the pressing plate 5 is also provided with a matching pattern groove, and both sides of the lower surface of the pressing plate are provided with material edge grooves that adapt to the burrs on the two edges of the stamping sheet, and the upper surfaces of the die and the die insert are also provided with material edge grooves that adapt to the burrs on the two edges of the stamping sheet;

[0050] The die assembly is provided with an avoidance groove on the upper surface of the discharge side for avoiding burrs. The shape of the avoidance groove matches the lower surface shape of the compressor intermediate plate blank obtained by stamping, and the depth of the avoidance groove is 0.3mm. When the stamping sheets are stamped continuously, the punched part of the front stamping sheet falls exactly on the avoidance groove.

[0051] Furthermore, the diameter of the 1# middle through hole is larger than the diameter of the middle coaxial through hole, and the outer diameter of the upper push rod II of the φ31.2 hole is larger than the outer diameter of the upper push rod I of the φ31.2 hole; the corners of the upper template and the corners of the lower template are provided with stamping guide holes for limiting and guiding during stamping; the stamping guide holes are matchedly sleeved on the guide pillars.

[0052] Furthermore, a bottom groove is provided at the bottom of the die, the bottom groove is located below the through groove, the width of the bottom groove is greater than the width of the through groove, a die insert pad is provided in the bottom groove, the die insert pad and the die insert are connected as a whole through the die insert screws; the die presses the die insert pad against the upper surface of the lower fixed plate, and a second stamping movable hole is provided on the die insert pad that matches the stamping movable hole of the die insert and is superimposed up and down.

[0053] Furthermore, the lower fixing plate is provided with a screw head hole, the position of the screw head hole matches and corresponds to the position of the screw of the die insert, and the screw head of the screw of the die insert is located in the screw head hole.

[0054] As a further improvement, the die is provided with two through-grooves, which are arranged one after the other and staggered and intersected end to end in the left-right direction, and the two through-grooves are connected at the staggered intersections;

[0055] The die inserts are 2 pieces, which are respectively fixed in the through-insertion grooves of the die;

[0056] The counter-pressure plate, the lower force transmission rod I, the lower force transmission rod II, the φ31.2 round hole punch, the φ7 round hole punch and the φ9.5 round hole punch constitute a counter-pressure lifting plate assembly, and the counter-pressure lifting plate assembly consists of two pieces, wherein the counter-pressure plates are respectively arranged in the stamping active holes of the corresponding die inserts to form a double-station lower die assembly with a double-station structure;

[0057] Similarly, the upper convex-concave die assembly is composed of the male and female dies, the upper ejector rod I of the φ7 hole, the upper ejector rod I of the φ9.5 hole, the upper ejector rod II of the φ7 hole, the upper ejector rod II of the φ9.5 hole, the upper ejector rod I of the φ31.2 hole and the upper ejector rod II of the φ31.2 hole. The upper convex-concave die assembly is composed of two pieces, forming a double-station upper die assembly matching the double-station lower die assembly. After the improvement, the stamping sheet can be fully utilized, the waste of scraps can be reduced and the work efficiency can be improved.

[0058] It can be seen from the above that, compared with the prior art, the present invention has the following advantages: parts are made by a special composite mold with a scientific and reasonable structure and a precision punching process, with fewer processing steps. Compared with the traditional process of manufacturing the compressor intermediate plate, at least two processes of heating and heat treatment are saved, and the drilling process reduces the processing volume of 7 holes, which greatly reduces and simplifies the processing steps. The precision punching process with faster processing speed and more convenient operation replaces the complicated die forging process, thereby reducing production costs, improving efficiency, and making the product more beautiful in appearance and with higher cross-sectional quality; the key holes are processed simultaneously with the outer shape, and no secondary positioning is required, there is no accumulated error, the shape and position dimensions are more stable, and the product yield rate is greatly improved; the consumption of materials and energy is greatly reduced, which is beneficial to energy conservation and environmental protection; it also solves the problem that φ7 and φ9 holes have small margins and are difficult to form; this technical solution is of great significance to improving the level of the domestic precision punching industry. BRIEF DESCRIPTION OF THE DRAWINGS

[0059] Figure 1 The present invention is a schematic structural diagram of a compressor intermediate plate.

[0060] Figure 2 It is a top view of the special composite mold of the present invention.

[0061] Figure 3 for Figure 2 Left view of .

[0062] Figure 4 for Figure 2 sectional view of .

[0063] Figure 5 for Figure 4 Exploded diagram of .

[0064] Figure 6 for Figure 4 Working status diagram of step 1 feeding.

[0065] Figure 7 for Figure 4 Working status diagram of step 2 pressing material.

[0066] Figure 8 for Figure 4 Working status diagram of step 3 fine blanking.

[0067] Fig. 9 for Figure 4 Step 4 of the working status diagram of mold opening.

[0068] Fig.10 for Figure 4 The working status diagram of step 5 discharging.

[0069] Fig.11 This is a three-dimensional diagram of the lower template.

[0070] Fig.12 This is a three-dimensional diagram of the bottom plate.

[0071] Fig.13 It is a three-dimensional view of the lower fixing plate.

[0072] Fig.14 This is a three-dimensional diagram of the die.

[0073] Fig.15 It is a three-dimensional diagram of the pressing plate.

[0074] Fig.16 A three-dimensional diagram of the guide plate.

[0075] Fig.17 This is a three-dimensional diagram of the upper template.

[0076] Fig.18 It is a three-dimensional view of the upper fixing plate.

[0077] Fig.19 This is a three-dimensional view of the upper pad.

[0078] Fig. 20 It is a three-dimensional diagram of the male and female molds.

[0079] Fig.21 It is a three-dimensional diagram of the die insert.

[0080] Fig. 22 It is a three-dimensional view of the die insert pad.

[0081] Fig.23 It is a three-dimensional diagram of the back pressure plate.

[0082] Fig.24 This is a three-dimensional diagram of the φ31.2 round hole punch.

[0083] Fig.25 It is a three-dimensional diagram of the φ7 round hole punch.

[0084] Fig.26 This is a three-dimensional diagram of the φ9.5 round hole punch.

[0085] Fig. 27 This is the process flow chart of fine blanking of compressor intermediate plate blank.

[0086] Description of Figure Numbers:

[0087] 1-lower template, 2-lower pad, 3-lower fixed plate, 4-die, 5-pressing plate, 6-guide plate, 7-upper template, 8-upper fixed plate, 9-upper pad, 10-φ7 hole upper ejector rod Ⅰ, 11-φ9.5 hole upper ejector rod Ⅰ, 12-φ7 hole upper ejector rod Ⅱ, 13-φ9.5 hole upper ejector rod Ⅱ, 14-φ31.2 hole upper ejector rod Ⅰ, 15-φ31.2 hole upper ejector rod Ⅱ, 16-convex and concave dies, 17-force transmitting ejector rod, 18-locking pin, 19-guide column, 27-die insert, 28-die insert pad, 29-lower force transmitting rod Ⅰ, 30-lower force transmitting rod Ⅱ, 34-φ31.2 round hole punch, 35-φ7 round hole punch, 36-φ9.5 round hole punch, 37-back pressure plate;

[0088] 161-1# middle through hole, 71-11# through hole, 91-12# through hole, 81-convex and concave die holes;

[0089] 162-2# top rod hole, 72-21# top rod hole, 92-22# top rod hole, 82-23# top rod hole;

[0090] 271-through slot, 275-pressing movable hole, 276-second punching movable hole, 273-die insert screw, 274-screw head hole;

[0091] 371-3# middle through hole, 31-31# middle through hole, 21-32# middle through hole

[0092] 372-4# punch hole, 32-41# punch hole, 22-42# punch hole;

[0093] 113-30# lower dowel rod II hole, 33-39# dowel rod I hole, 23-29# dowel rod I hole;

[0094] 61-guide groove, 49-bottom groove; 181-male pin, 182-spring female pin; 401-pattern groove, 402-avoidance groove; 501-material edge groove, 79-stamping guide hole;

[0095] 100-stamping sheet, 101-compressor middle plate, 102-stamping waste. DETAILED DESCRIPTION

[0096] The present invention and its beneficial technical effects are further described in detail below in conjunction with the accompanying drawings and preferred embodiments. For the convenience of distinction during description, all references to "detachable arrangement" are generally fixed with bolts in the prior art; some similar technical features are divided according to their commonly used size specifications, such as "φ" and specific values ​​are used to describe the diameter. In actual applications, the corresponding values ​​can be adjusted according to actual needs and are not fixed. Other components with separate motion control that are not specifically described can be driven by conventional methods such as air cylinders and oil cylinders on stamping machines.

[0097] See also Fig. 27 The fine blanking process of the compressor intermediate plate blank preferably implemented in the present invention is characterized by comprising the following processes: material preparation → stamping → turning the outer circle → drilling small holes → double-sided grinding → cleaning → full inspection and packaging; wherein,

[0098] The stamping process includes the following steps:

[0099] See also Figure 6 Step 1: feeding, conveying the stamping sheet material into a special composite die of the stamping machine, wherein the special composite die comprises an upper die assembly and a lower die assembly arranged opposite to each other, and the stamping sheet material passes between the upper die assembly and the lower die assembly;

[0100] See also Figure 7 , step 2, pressing the material, the special composite mold is closed to press the stamping sheet;

[0101] See also Figure 8 , step 3, fine punching, the punching machine drives the lower die assembly and the upper die assembly to punch the punching sheet to punch holes and blank the sheet;

[0102] See also Fig. 9 , step 4, opening the mold, the punching machine drives the lower mold assembly and the upper mold assembly to separate;

[0103] See also Fig.10 , step 5, discharging, the punching machine drives the lower die assembly and the upper die assembly to respectively eject the compressor intermediate plate blank and the stamping waste obtained by stamping;

[0104] In the outer circle turning process, the outer circle of the compressor intermediate plate blank is smoothed and finished on the machine tool;

[0105] In the small hole drilling process, two φ3 holes with relatively small hole diameters are drilled at designated positions on the compressor intermediate plate blank on the machine tool;

[0106] In the double-sided grinding process, the upper and lower surfaces of the compressor intermediate plate blank are polished and polished;

[0107] During the cleaning process, the compressor intermediate plate blank is fully processed to obtain the finished compressor intermediate plate.

[0108] Among the above processes, the outer circle turning process, small hole drilling process, double-sided grinding process, heat treatment process and cleaning process can adopt existing processes.

[0109] See also Figure 2~Figure 26 Preferably, the upper mold assembly includes an upper mold plate 7, an upper fixing plate 8, an upper pad 9, a male and female mold 16, a φ7 hole upper ejector rod Ⅰ10, a φ9.5 hole upper ejector rod Ⅰ11, a φ7 hole upper ejector rod Ⅱ12, a φ9.5 hole upper ejector rod Ⅱ13, a φ31.2 hole upper ejector rod Ⅰ14, and a φ31.2 hole upper ejector rod Ⅱ15; wherein,

[0110] The upper mold plate 7 is used to carry the aforementioned components in the upper mold assembly and is installed above the lower mold assembly;

[0111] The upper pad 9 is detachably disposed under the upper mold plate 7 to protect the upper mold plate 7 and withstand the force transmitted from the male and female molds 16;

[0112] The upper fixing plate 8 is detachably arranged under the upper pad 9 and is used to fix the male and female dies 16. The upper fixing plate 8 is provided with male and female die holes 81 for fixing the male and female dies 16.

[0113] The male and female dies 16 are detachably arranged under the upper fixed plate 8. The upper outer side of the male and female dies 16 is fixed to the male and female die holes 81 on the upper fixed plate 8 for stamping the shape of the compressor intermediate plate blank. The shape of the male and female dies 16 matches the shape of the compressor intermediate plate blank. In step 3, the punching machine controls the upper template 7, the upper pad 9, the upper fixed plate 8 and the male and female dies 16 to remain motionless, and the punching machine controls the lower die assembly to stamp upward. With the cooperation of the male and female dies 16 and the lower die assembly, the compressor intermediate plate blank is punched out of the stamping sheet material to form.

[0114] See also Fig. 20 The middle of the male and female molds 16 is provided with a 1# middle through hole 161 for the φ31.2 hole upper push rod Ⅱ15 to move up and down. It can be movably arranged in the 1# middle through hole 161; the upper template 7 and the upper pad 9 are both provided with a middle coaxial through hole coaxially opposite to the 1# middle through hole 161, and the middle coaxial through holes correspond to the 11# through hole 71 and the 12# through hole 91 from top to bottom respectively; the φ31.2 hole upper ejector rod Ⅰ14 can movably pass through the 10# through hole 71, the 20# through hole 91 and the 30# through hole 81 and be connected to the φ31.2 hole upper ejector rod Ⅱ15 as a whole; the upper end of the φ31.2 hole upper ejector rod Ⅰ14 is connected to the punching machine, and in step 5, the punching machine controls the φ31.2 hole upper ejector rod Ⅰ14 to press down, driving the φ31.2 hole upper ejector rod Ⅱ15 to eject the stamping waste obtained by stamping in step 3 downward from the male and female molds 16;

[0115] See also Fig. 20, a plurality of 2# ejector rod holes 162 are provided at the edges of the male and female molds 16, and the ejector rods Ⅰ10 on the φ7 holes and the ejector rods Ⅰ11 on the φ9.5 holes can be movably arranged in their respective corresponding 2# ejector rod holes 162; the upper template 7, the upper pad 9, and the upper fixed plate 8 are each provided with a plurality of groups of coaxial ejector rod holes coaxially opposite to each 2# ejector rod hole 162, and each group of coaxial ejector rod holes corresponds to the 21# ejector rod hole 72, the 22# ejector rod hole 92, and the 23# ejector rod hole 82 from top to bottom; the ejector rods Ⅱ12 on the φ7 holes and the ejector rods Ⅱ13 on the φ9.5 holes can be movably passed through their respective corresponding 21 # ejector rod hole 72, 22# ejector rod hole 92 and 23# ejector rod hole 82, φ7 hole upper ejector rod Ⅰ10 and φ7 hole upper ejector rod Ⅱ12 are connected as one body, φ9.5 hole upper ejector rod Ⅰ11 and φ9.5 hole upper ejector rod Ⅱ13 are connected as one body; the upper ends of φ7 hole upper ejector rod Ⅰ10 and φ9.5 hole upper ejector rod Ⅰ11 are connected to the punching machine, and in step 5, the punching machine controls the φ7 hole upper ejector rod Ⅰ10 and φ9.5 hole upper ejector rod Ⅰ11 to press down, driving the φ7 hole upper ejector rod Ⅰ10 and φ9.5 hole upper ejector rod Ⅰ11 to push the stamping waste obtained by stamping in step 3 downward from the male and female dies 16;

[0116] See also Figure 7 In step 2, the lower ends of the upper push rod Ⅱ15 of the φ31.2 hole, the upper push rod Ⅱ12 of the φ7 hole and the upper push rod Ⅱ13 of the φ9.5 hole are flush with the lower surface of the male and female dies 16 and pressed on the upper surface of the stamping sheet.

[0117] See also Figure 2~Figure 5 Preferably, the lower die assembly includes a lower die plate 1, a lower pad 2, a lower fixing plate 3, a die 4, a lower force transmission rod I 29, a lower force transmission rod II 30, a die insert 27, a back pressure plate 37, a φ31.2 round hole punch 34, a φ7 round hole punch 35 and a φ9.5 round hole punch 36; wherein,

[0118] The lower mold plate 1 is used to carry the aforementioned components in the lower mold assembly and is installed below the upper mold assembly;

[0119] The lower pad 2 is detachably arranged on the upper surface of the lower mold plate 1, and is used to protect the lower mold plate 1 and bear the force transmitted by each round hole punch;

[0120] The lower fixing plate 3 is detachably arranged on the upper surface of the lower pad 2 and is used to fix the concave mold and all the round hole convex molds;

[0121] The die 4 is detachably arranged on the upper surface of the lower fixed plate 3, see Fig.14 The die 4 is provided with a through groove 271 for accommodating the die insert 27;

[0122] The preferred structural diagram of the lower template 1, the lower pad 2, the lower fixing plate 3, and the concave mold 4 is shown in FIG. Figure 11~Figure 14 ;

[0123] The die insert 27 is fixed in the through groove 271 of the die 4. The upper surface of the die insert 27 is flush with the upper surface of the die 4. Fig.21 The die insert 27 is provided with a punching active hole 275 which also serves as a punching forming groove for the compressor intermediate plate blank and a guide hole for the counter pressure plate 37;

[0124] The back pressure plate 37 is movably arranged in the punching movable hole 275 of the die insert 27. The height of the back pressure plate 37 is less than the height of the punching movable hole 275. Fig.23 , the counter-pressure plate 37 is provided with a 3# middle through hole 371 and a plurality of 4# convex holes 372; under normal conditions, the upper surface of the counter-pressure plate 37 is exposed upward from the punching active hole 275 of the die insert 27;

[0125] The preferred structural diagram of the die insert 27 and the counter pressure plate 37 is shown in FIG. Fig.21 , Fig.23 ;

[0126] The lower force transfer rod Ⅰ29 is connected to the bottom of the back pressure plate 37. The lower fixed plate 3 and the lower pad 2 are both provided with lower force transfer rod Ⅰ holes for the lower force transfer rod Ⅰ29 to pass downward, which are 39# force transfer rod Ⅰ hole 33 and 29# force transfer rod Ⅰ hole 23 respectively;

[0127] The lower dowel rod II 30 is connected to the lower end of the lower dowel rod I 29. The lower template 1 is provided with a 30# lower dowel rod II hole 113 for the lower dowel rod II 30 to pass through downward.

[0128] See also Fig.24 , φ31.2 round hole punch 34, used for punching the φ31.2 round hole on the middle plate blank of the compressor;

[0129] See also Fig.25 , φ7 round hole punch 35, used for punching the φ7 round hole on the middle plate blank of the compressor;

[0130] See also Fig.26 , φ9.5 round hole punch 36, used for punching the φ9.5 round hole on the middle plate blank of the compressor;

[0131] The position and specification of the 3# middle through hole 371 match and correspond to the 1# middle through hole 161 on the male and female molds 16, and the position, specification and quantity of the 4# male mold holes 372 match and correspond to the 2# ejector rod holes 162 on the male and female molds 16;

[0132] The lower fixing plate 3 and the lower pad 2 are both provided with 31# middle through holes 31 and 32# middle through holes 21 coaxially opposite to the 3# middle through holes 371; the lower fixing plate 3 and the lower pad 2 are both provided with a plurality of groups of coaxial punch holes coaxially opposite to each 4# punch hole 372, and each group of coaxial punch holes corresponds to the 41# punch hole 32 and the 42# punch hole 22 from top to bottom;

[0133] The φ31.2 round hole punch 34 can be movably inserted into the 32# middle through hole 21, the 31# middle through hole 31, and the 3# middle through hole 371 in sequence, with the upper end flush with the upper surface of the die 4 and the lower end detachably fixed on the lower pad 2;

[0134] The φ7 round hole punch 35 and the φ9.5 round hole punch 36 can be movably inserted into the corresponding 41# punch hole 32, 42# punch hole 22, and 4# punch hole 372 in sequence, and the upper ends are flush with the upper surface of the die 4, and the lower ends are detachably fixed on the lower pad 2;

[0135] The lower end of the lower force transmission rod II 30 is connected to the punching machine, see Figure 7 In step 2, the upper surface of the counter-pressure plate 37 and the upper end surfaces of the φ31.2 round hole punch 34, the φ7 round hole punch 35, and the φ9.5 round hole punch 36 are kept flush with the upper surface of the die 4 and pressed on the lower surface of the stamping sheet;

[0136] See also Figure 8 In step 3, in the lower die assembly, the punching machine controls the lower force transmission rod II 30 and the lower force transmission rod I 29 to move downward, thereby driving the back pressure plate 37 downward, so that the upper surface height of the back pressure plate 37 is lower than the upper surface of the die insert 27, and the height difference between the two is greater than the thickness of the stamped sheet; at this time, the upper ends of the φ31.2 round hole punch 34, the φ7 round hole punch 35 and the φ9.5 round hole punch 36 are all kept flush with the upper surface of the die 4; in the upper die assembly, the punching machine controls and drives the φ31.2 hole upper push rod II 15, the φ7 hole upper push rod II 12 and the φ9.5 hole upper push rod II 13 upward, and the lower parts of the holes in the convex and concave dies 16 are all emptied;

[0137] See also Figure 8 In step 3, the upper template 7, the upper pad 9, the upper fixed plate 8 and the male and female dies 16 remain stationary, and the punching machine controls the lower template 1, the lower pad 2, the lower fixed plate 3 and the female die 4 to drive the back pressure plate 37 to press upward together; the back pressure plate 37, in cooperation with the male and female dies 16, punches the compressor intermediate plate blank out of the punching sheet and forms it in the punching active hole 275; the φ31.2 round hole punch 34, the φ7 round hole punch 35 and the φ9.5 round hole punch 36, in cooperation with the male and female dies 16, punch out φ31.2 holes, φ7 holes and φ9.5 holes in the compressor intermediate plate blank respectively;

[0138] See also Figure 8In step 3, under the combined action of the punching of the counter-pressure plate 37 and the top-gripping of the φ31.2 round hole punch 34, the φ7 round hole punch 35 and the φ9.5 round hole punch 36, the punching wastes corresponding to the holes punched out of the compressor intermediate plate blank enter the corresponding 1# intermediate through hole 161 and 2# ejector rod hole 162 in the male and female dies 16 respectively;

[0139] See also Fig. 9 In step 4, the punching machine drives the lower die assembly and the upper die assembly to separate, and the stamping waste is separated from the compressor intermediate plate blank obtained by stamping along with the male and female dies 16; the compressor intermediate plate blank is now located in the stamping active hole 275 of the female die insert 27;

[0140] See also Fig.10 In step 5, in the lower die assembly, the punching machine controls the lower force transfer rod Ⅱ30 and the lower force transfer rod Ⅰ29 to reset upward, thereby driving the back pressure plate 37 to reset upward, and the compressor intermediate plate blank obtained by stamping is ejected from the stamping active hole 275 of the die insert 27, separated from the upper surface of the back pressure plate 37, and at the same time, the upper surface height of the back pressure plate 37 is restored to a flush state with the upper surface of the die insert 27; in the upper die assembly, the punching machine controls and drives the φ31.2 hole upper ejector rod Ⅱ15, the φ7 hole upper ejector rod Ⅱ12 and the φ9.5 hole upper ejector rod Ⅱ13 to reset downward and eject the stamping waste in the male and female dies 16 downward.

[0141] In addition, in the fine stamping process method of the compressor intermediate plate blank preferably implemented by the present invention, the lower die assembly of the special composite die used by the stamping machine is used as the stamping moving part, and the upper die assembly is used as the stationary part, that is, the stamping machine is a bottom-moving stamping machine; it is different from the working mode of the traditional top-moving stamping machine in which the upper die moves and the lower die does not move. The advantage of this setting is that since the weight and shape of the hydraulic cylinder as the stamping power source of the stamping machine are relatively large, if the hydraulic cylinder is set in the upper position of the stamping machine, the guidance and rigidity of the stamping machine will be affected by the gravity and working vibration of the hydraulic cylinder and become worse; thus affecting the stamping accuracy during stamping. The bottom-moving stamping machine sets the hydraulic cylinder in the lower position of the stamping machine, so that the guidance and rigidity of the stamping machine are greatly reduced by the gravity and working vibration of the hydraulic cylinder, thereby maintaining good performance and ensuring stamping accuracy.

[0142] See also Figure 2~Figure 5Preferably, a guide plate 6 is provided below the upper template 7, and the guide plate 6 can be movably suspended on the upper template 7 by a guide column 19, and a guide groove 61 is provided on the guide plate 6 for the upper pad 9, the upper fixed plate 8 and the male and female molds 16 to move; a pressing plate 5 is provided below the guide plate 6, and the pressing plate 5 is detachably fixed under the guide plate 6; a force transmitting push rod 17 is provided on the top of the pressing plate 5; the lower end of the force transmitting push rod 17 is fixed to the top of the pressing plate 5, and the upper end passes through the guide groove 61 and the upper fixed plate 8, the upper pad 9, and the upper template 7 in sequence, and then can be movably extended from the top of the upper template 7; see Figure 7 In step 2, the pressing plate 5 presses the stamping sheet material in the lower die assembly; in step 3, the upper force-transmitting push rod 17 is controlled by the punching machine to move upward, driving the guide plate 6 and the pressing plate 5 to retract, thereby freeing up space for the stamping activity of the stamping sheet material; in step 5, the upper force-transmitting push rod 17 is controlled by the punching machine to move downward, driving the guide plate 6 and the pressing plate 5 to push downward, thereby pushing downward the stamping sheet material stuck on the male and female dies 16 after stamping.

[0143] See also Figure 2~Figure 5 In order to perform the stamping process more accurately, preferably, a locking pin 18 for guiding and positioning the die 4 and the pressing plate 5 for stamping is provided between the upper die assembly and the lower die assembly; a male pin 181 of the locking pin 18 is provided on the pressing plate 5, and the lower end of the male pin 181 extends downward from the bottom of the pressing plate 5;

[0144] The spring female pin 182 of the locking pin 18 is vertically arranged on the lower mold plate 1, the lower pad 2, the lower fixing plate 3, and the concave mold 4. The spring female pin 182 and the male pin 181 are matched and opposite to each other up and down; see Figure 7 In step 2, the lower die assembly is moved upward by the punching machine, and the locking pin 18 is inserted into the spring female pin 82; otherwise, see Figure 8 In step 4, the lower mold assembly moves downward and retracts, and the locking pin 18 and the spring female pin 182 are separated.

[0145] See also Figure 2~Figure 5 Preferably, the die assembly formed by the die 4 and the die insert 27 has a pattern groove 401 for storing oil on the upper surface of the die assembly on the feeding side, and the shape of the pattern groove 401 matches the shape of the lower surface of the compressor intermediate plate blank obtained by stamping, and the depth of the pattern groove 401 is 0.3mm; when the stamping sheet is stamped continuously, the position of the subsequent sheet to be stamped just falls on the pattern groove 401; the lower surface of the pressing plate 5 is also provided with a matching pattern groove 401, and the two sides of the lower surface of the pressing plate 5 are provided with material edge grooves 501 that adapt to the burrs on the two edges of the stamping sheet, and the upper surfaces of the die 4 and the die insert 27 are also provided with material edge grooves 501 that adapt to the burrs on the two edges of the stamping sheet;

[0146] The die assembly is provided with an avoidance groove 402 on the upper surface of the discharge side for avoiding burrs. The shape of the avoidance groove 402 matches the shape of the lower surface of the compressor intermediate plate blank obtained by stamping, and the depth of the avoidance groove 402 is 0.3mm. When the stamping sheet is stamped continuously, the punched part of the front stamping sheet falls exactly on the avoidance groove 402.

[0147] See also Figure 2~Figure 5 , in order to facilitate the limitation of the movable space above the push rod Ⅱ15 on the φ31.2 hole; preferably, the diameter of the 1# middle through hole 161 is larger than the diameter of the middle coaxial through hole, and the outer diameter of the push rod Ⅱ15 on the φ31.2 hole is larger than the outer diameter of the push rod Ⅰ14 on the φ31.2 hole; the corners of the upper template 7 and the corners of the lower template 1 are provided with stamping guide holes 79 for limiting and guiding during stamping; the stamping guide holes 79 are matched and sleeved on the guide pillars 19.

[0148] See also Figure 2~Figure 5 , Fig. 22 In order to facilitate the fixation and processing of the die insert 27, preferably, a bottom groove 49 is provided at the bottom of the die 4, and the bottom groove 49 is located below the through-groove 271. The width of the bottom groove 49 is greater than the width of the through-groove 271. A die insert pad 28 is provided in the bottom groove 49, and the die insert pad 28 and the die insert 27 are connected as a whole through the die insert screw 273; the die 4 presses the die insert pad 28 on the upper surface of the lower fixed plate 3, and a second stamping movable hole 276 is provided on the die insert pad 28, which matches the stamping movable hole 275 of the die insert 27 and is superimposed on the upper and lower sides.

[0149] See also Figure 2~Figure 5 Preferably, a screw head hole 274 is provided on the lower fixing plate 3 , and the position of the screw head hole 274 matches and corresponds to the position of the die insert screw 273 , and the screw head of the die insert screw 273 is located in the screw head hole 274 .

[0150] As another improved implementation method, in order to make full use of stamping sheet materials, reduce the waste of scraps and improve work efficiency, based on the above implementation, see Figure 11~Figure 21 Preferably, the die 4 is provided with two through-grooves 271, which are arranged one after the other and staggered and intersected head to tail in the left-right direction, and the two through-grooves 271 are connected at the staggered intersections;

[0151] The die inserts 27 are two pieces, which are respectively fixed in the through-grooves 271 of the die 4;

[0152] The back pressure plate 37, the lower force transmission rod I 29, the lower force transmission rod II 30, the φ31.2 round hole punch 34, the φ7 round hole punch 35 and the φ9.5 round hole punch 36 constitute a back pressure lifting plate assembly, and the back pressure lifting plate assembly is 2 pieces, wherein the back pressure plates 37 are respectively arranged in the stamping active holes 275 of the corresponding die inserts 27, forming a double-station lower die assembly with a double-station structure;

[0153] Similarly, the male and female dies 16, the φ7 hole upper ejector rod Ⅰ10, the φ9.5 hole upper ejector rod Ⅰ11, the φ7 hole upper ejector rod Ⅱ12, the φ9.5 hole upper ejector rod Ⅱ13, the φ31.2 hole upper ejector rod Ⅰ14 and the φ31.2 hole upper ejector rod Ⅱ15 constitute an upper male and female die assembly. The upper male and female die assembly consists of two pieces, forming a double-station upper die assembly that matches the double-station lower die assembly.

[0154] By adopting a double-station structure, each stamping action can stamp two compressor middle plates at the same time. Since the two compressor middle plates are not horizontally parallel in the stamping positions corresponding to the stamping sheets, but are horizontally staggered, the width of the stamping sheet can be smaller than the outer diameter of the two compressor middle plates. What is unexpected is that on the stamping sheet, the rear compressor middle plate makes full use of the scraps of the staggered part behind the front compressor middle plate, thereby cleverly reducing the loss of stamping sheets and saving energy and protecting the environment.

[0155] The above description and specific embodiments do not constitute any limitation to the present invention. The present invention is not limited to the specific implementation modes disclosed and described above. Some modifications and variations of the present invention should also fall within the protection scope of the claims of the present invention.

Claims

1. A fine blanking process for a compressor intermediate plate blank, characterized in that: The process includes: material preparation → stamping → turning the outer circle → drilling small holes → double-sided grinding → cleaning → full inspection and packaging; The stamping process includes the following steps: Step 1, feeding, conveying the stamping sheet material into a special composite die of the stamping machine, wherein the special composite die comprises an upper die assembly and a lower die assembly arranged opposite to each other, and the stamping sheet material passes through between the upper die assembly and the lower die assembly; Step 2: Pressing the material, the special composite mold is closed to press the stamping sheet; Step 3, fine punching, the punching machine drives the lower die assembly and the upper die assembly to punch the punching sheet to punch holes and blank the sheet; Step 4, opening the mold, the punching machine drives the lower mold assembly and the upper mold assembly to separate; Step 5, discharging, the punching machine drives the lower die assembly and the upper die assembly to respectively eject the compressor intermediate plate blank and the stamping waste obtained by stamping; In the outer circle turning process, the outer circle of the compressor intermediate plate blank is smoothed and finished on the machine tool; In the small hole drilling process, two φ3 holes with relatively small hole diameters are drilled at designated positions on the compressor intermediate plate blank on the machine tool; In the double-sided grinding process, the upper and lower surfaces of the compressor intermediate plate blank are polished and polished; In the cleaning process, the compressor intermediate plate blank is fully processed to obtain the finished compressor intermediate plate; The upper die assembly comprises an upper die plate (7), an upper fixing plate (8), an upper pad (9), a male and female die (16), an upper ejector rod I (10) for a φ7 hole, an upper ejector rod I (11) for a φ9.5 hole, an upper ejector rod II (12) for a φ7 hole, an upper ejector rod II (13) for a φ9.5 hole, an upper ejector rod I (14) for a φ31.2 hole, and an upper ejector rod II (15) for a φ31.2 hole; wherein: An upper mold plate (7) is used to carry the aforementioned components in the upper mold assembly and is installed above the lower mold assembly; An upper pad (9) is detachably disposed below the upper mold plate (7) and is used to protect the upper mold plate (7) and withstand the force transmitted by the male and female molds (16); An upper fixing plate (8) is detachably arranged below the upper pad (9) and is used to fix the male and female dies (16); the upper fixing plate (8) is provided with male and female die holes (81) for fixing the male and female dies (16); The male and female dies (16) are detachably arranged below the upper fixed plate (8); the upper outer sides of the male and female dies (16) are fixed to the male and female die holes (81) on the upper fixed plate (8) and are used for stamping the shape of the compressor intermediate plate blank; the outer shape of the male and female dies (16) matches the outer shape of the compressor intermediate plate blank; in step 3, the upper template (7), the upper pad (9), the upper fixed plate (8) and the male and female dies (16) are kept stationary together, and the punching machine controls the lower die assembly to stamp upwards, and with the cooperation of the male and female dies (16) and the lower die assembly, the compressor intermediate plate blank is punched out of the stamping sheet to form; The middle of the male and female molds (16) is provided with a 1# middle through hole (161) for the φ31.2 hole upper push rod II (15) to move up and down. The upper mold plate (7) and the upper pad (9) are both provided with intermediate coaxial through holes coaxially opposite to the intermediate through hole (161), and the intermediate coaxial through holes correspond to the 11# through hole (71) and the 12# through hole (91) from top to bottom, respectively; the φ31.2 hole upper ejector rod I (14) can be movably arranged in the upper direction through the 10# through hole 71, the 20# through hole 91 and the 30# through hole 81 to be connected to the φ31.2 hole upper ejector rod II (15) to form a whole; the upper end of the φ31.2 hole upper ejector rod I (14) is connected to the punching machine, and in step 5, the punching machine controls the φ31.2 hole upper ejector rod I (14) to press downward, thereby driving the φ31.2 hole upper ejector rod II (15) to eject the stamping waste obtained by stamping in step 3 downward from the male and female molds (16); A plurality of 2# ejector rod holes (162) are provided at the edges of the male and female molds (16); the φ7 hole upper ejector rod I (10) and the φ9.5 hole upper ejector rod I (11) can be movably arranged in the corresponding 2# ejector rod holes (162) in an upward and downward manner; the upper mold plate (7), the upper pad plate (9), and the upper fixed plate (8) are each provided with a plurality of groups of coaxial ejector rod holes coaxially opposite to each 2# ejector rod hole (162), and each group of coaxial ejector rod holes corresponds to the 21# ejector rod hole (72), the 22# ejector rod hole (92), and the 23# ejector rod hole (82) from top to bottom; the φ7 hole upper ejector rod II (12) and the φ9.5 hole upper ejector rod II (13) can be movably passed through the corresponding 21# ejector rod hole in an upward and downward manner; The ejector pin hole (72), the 22# ejector pin hole (92) and the 23# ejector pin hole (82), the φ7 hole upper ejector pin I (10) and the φ7 hole upper ejector pin II (12) are connected as a whole, and the φ9.5 hole upper ejector pin I (11) and the φ9.5 hole upper ejector pin II (13) are connected as a whole; the upper ends of the φ7 hole upper ejector pin I (10) and the φ9.5 hole upper ejector pin I (11) are both connected to a punching machine, and in step 5, the punching machine controls the φ7 hole upper ejector pin I (10) and the φ9.5 hole upper ejector pin I (11) to press downward, thereby driving the φ7 hole upper ejector pin I (10) and the φ9.5 hole upper ejector pin I (11) to eject the stamping waste obtained by stamping in step 3 downward from the male and female dies (16); In step 2, the lower ends of the φ31.2 hole upper push rod II (15), the φ7 hole upper push rod II (12) and the φ9.5 hole upper push rod II (13) are all flush with the lower surface of the male and female dies (16) and pressed on the upper surface of the stamping sheet.

2. The fine blanking process for the compressor intermediate plate blank according to claim 1, characterized in that: The lower die assembly comprises a lower die plate (1), a lower pad (2), a lower fixing plate (3), a die (4), a lower force transmission rod I (29), a lower force transmission rod II (30), a die insert (27), a back pressure plate (37), a φ31.2 round hole punch (34), a φ7 round hole punch (35) and a φ9.5 round hole punch (36); wherein: A lower mold plate (1), used for carrying the aforementioned components in the lower mold assembly, and installed below the upper mold assembly; A lower pad (2) is detachably arranged on the upper surface of the lower mold plate (1) and is used to protect the lower mold plate (1) and to withstand the force transmitted by each circular hole punch; A lower fixing plate (3) is detachably arranged on the upper surface of the lower pad (2) and is used to fix the concave die and all the round hole convex dies and all the round hole convex dies; The die (4) is detachably arranged on the upper surface of the lower fixed plate (3), and the die (4) is provided with a through-groove (271) for accommodating a die insert (27); A die insert (27) is fixed in the through-groove (271) of the die (4); the upper surface of the die insert (27) is flush with the upper surface of the die (4); and a punching active hole (275) serving as a punching forming groove for the compressor intermediate plate blank and a guide hole for the counter pressure plate (37) is provided on the die insert (27); A back pressure plate (37) is movably arranged in the punching movable hole (275) of the die insert (27) up and down, the height of the back pressure plate (37) is smaller than the height of the punching movable hole (275), and the back pressure plate (37) is provided with a 3# middle through hole (371) and a plurality of 4# convex die holes (372); in a normal state, the upper surface of the back pressure plate (37) is exposed upward from the punching movable hole (275) of the die insert (27); The lower force transmission rod I (29) is connected to the bottom of the back pressure plate (37). The lower fixing plate (3) and the lower pad (2) are both provided with lower force transmission rod I holes for the lower force transmission rod I (29) to pass through downwards, namely, the 39# force transmission rod I hole (33) and the 29# force transmission rod I hole (23); The lower dowel rod II (30) is connected to the lower end of the lower dowel rod I (29). The lower template (1) is provided with a 30# lower dowel rod II hole (113) for the lower dowel rod II (30) 9 to pass through downward. A φ31.2 round hole punch (34) is used to punch a φ31.2 round hole on the middle plate blank of the compressor; A φ7-round hole punch (35) is used to punch a φ7-round hole on the middle plate blank of the compressor; A φ9.5 round hole punch (36) is used for punching a φ9.5 round hole on a middle plate blank of a compressor; The position and specification of the 3# middle through hole (371) match and correspond to the 1# middle through hole (161) on the male and female molds (16), and the position, specification and number of the 4# male mold holes (372) match and correspond to the 2# ejector pin holes (162) on the male and female molds (16); The lower fixing plate (3) and the lower pad (2) are both provided with a 31# middle through hole (31) and a 32# middle through hole (21) coaxially opposite to the 3# middle through hole (371); the lower fixing plate (3) and the lower pad (2) are both provided with a plurality of groups of coaxial punch holes coaxially opposite to each 4# punch hole (372), and each group of coaxial punch holes corresponds to the 41# punch hole (32) and the 42# punch hole (22) from top to bottom; The φ31.2 round hole punch (34) is movably inserted into the 32# middle through hole (21), the 31# middle through hole (31), and the 3# middle through hole (371) in sequence, with the upper end being flush with the upper surface of the die (4) and the lower end being detachably fixed on the lower pad (2); The φ7 round hole punch (35) and the φ9.5 round hole punch (36) can be movably inserted into the corresponding 41# punch hole (32), 42# punch hole (22), and 4# punch hole (372) in sequence, and the upper ends are flush with the upper surface of the die (4), and the lower ends are detachably fixed on the lower pad (2); The lower end of the lower force transmission rod II (30) is connected to the punching machine. In step 2, the upper surface of the counter-pressure plate (37) and the upper end surfaces of the φ31.2 round hole punch (34), the φ7 round hole punch (35), and the φ9.5 round hole punch (36) are all kept flush with the upper surface of the die (4) and pressed on the lower surface of the punched sheet; In step 3, in the lower die assembly, the punching machine controls the lower force transmission rod II (30) and the lower force transmission rod I (29) to move downward, thereby driving the back pressure plate (37) downward, so that the upper surface height of the back pressure plate (37) is lower than the upper surface of the die insert (27), and the height difference between the two is greater than the thickness of the stamped sheet; at this time, the upper ends of the φ31.2 round hole punch (34), the φ7 round hole punch (35) and the φ9.5 round hole punch (36) are all kept flush with the upper surface of the die (4); in the upper die assembly, the punching machine controls and drives the φ31.2 hole upper push rod II (15), the φ7 hole upper push rod II (12) and the φ9.5 hole upper push rod II (13) to move upward, and the lower parts of the holes in the convex and concave dies (16) are all emptied; In step 3, the upper template (7), the upper pad (9), the upper fixed plate (8) and the male and female dies (16) remain stationary, and the punching machine controls the lower template (1), the lower pad (2), the lower fixed plate (3) and the female dies (4) to drive the back pressure plate (37) to press upward together; the back pressure plate (37) punches the compressor intermediate plate blank out of the stamping sheet material and forms it in the stamping active hole (275) with the cooperation of the male and female dies (16); the φ31.2 round hole punch (34), the φ7 round hole punch (35) and the φ9.5 round hole punch (36) punch out a φ31.2 hole, a φ7 hole and a φ9.5 hole in the compressor intermediate plate blank respectively with the cooperation of the male and female dies (16); In step 3, under the combined action of the punching of the counter-pressure plate (37) and the top-gripping of the φ31.2 round hole punch (34), the φ7 round hole punch (35) and the φ9.5 round hole punch (36), the punching wastes corresponding to the holes punched out of the compressor intermediate plate blank respectively enter the corresponding 1# intermediate through hole (161) and 2# ejector rod hole (162) in the male and female dies (16); In step 4, the punching machine drives the lower die assembly and the upper die assembly to separate, and the stamping waste is separated from the compressor intermediate plate blank obtained by stamping along with the male and female dies (16); the compressor intermediate plate blank is now located in the stamping active hole (275) of the female die insert (27); In step 5, in the lower die assembly, the punching machine controls the lower force transfer rod II (30) and the lower force transfer rod I (29) to reset upward, thereby driving the back pressure plate (37) to reset upward, and ejecting the compressor intermediate plate blank obtained by punching from the punching movable hole (275) of the die insert (27) and separating it from the upper surface of the back pressure plate (37), while also restoring the height of the upper surface of the back pressure plate (37) to be flush with the upper surface of the die insert (27); in the upper die assembly, the punching machine controls and drives the φ31.2 hole upper ejector rod II (15), the φ7 hole upper ejector rod II (12) and the φ9.5 hole upper ejector rod II (13) to reset downward and eject the stamping waste in the male and female dies (16) downward.

3. The fine blanking process for the compressor intermediate plate blank according to claim 2, characterized in that: A guide plate (6) is provided below the upper mold plate (7). The guide plate (6) is suspended on the upper mold plate (7) via a guide column (19) so as to be movable up and down. A guide groove (61) is provided on the guide plate (6) for the upper pad (9), the upper fixing plate (8) and the male and female molds (16) to move. A pressing plate (5) is provided below the guide plate (6). The pressing plate (5) is detachably fixed below the guide plate (6). A force transmitting push rod (17) is provided on the top of the pressing plate (5). The force transmitting push rod (17) The lower end is fixed to the top of the pressing plate (5), and the upper end passes through the guide groove (61) and the upper fixed plate (8), the upper pad (9), and the upper template (7) in sequence, and then can be movably extended from the upper template (7); in step 2, the pressing plate (5) presses the stamping sheet material in the lower die assembly; in step 3, the upper force-transmitting push rod (17) is controlled by the punching machine to move upward, driving the guide plate (6) and the pressing plate (5) to retract, thereby freeing up a stamping activity space for the stamping sheet material; in step 5, the upper force-transmitting push rod (17) is controlled by the punching machine to move downward, driving the guide plate (6) and the pressing plate (5) to push downward, and pushing the stamping sheet material stuck on the male and female dies (16) downward after stamping.

4. The fine blanking process for the compressor intermediate plate blank according to claim 3, characterized in that: A locking pin (18) for guiding and positioning the die (4) and the pressing plate (5) during stamping is provided between the upper die assembly and the lower die assembly; a male pin (181) of the locking pin (18) is provided on the pressing plate (5), and a lower end of the male pin (181) extends downward from below the pressing plate (5); The spring female pin (182) of the locking pin (18) is vertically arranged on the lower mold plate (1), the lower pad (2), the lower fixing plate (3), and the concave mold (4), and the spring female pin (182) and the male pin (181) are matched and opposed to each other up and down; in step 2, the lower mold assembly is controlled by the punching machine to move upward, and the locking pin (18) is inserted into the spring female pin (182); conversely, in step 4, the lower mold assembly moves downward and retracts, and the locking pin (18) and the spring female pin (182) are separated.

5. The fine blanking process for the compressor intermediate plate blank according to claim 4, characterized in that: The die assembly formed by the die (4) and the die insert (27) has a pattern groove (401) for storing oil on the upper surface of the die assembly on the feeding side, the shape of the pattern groove (401) matches the shape of the lower surface of the compressor intermediate plate blank obtained by stamping, and the depth of the pattern groove (401) is 0.3 mm; when the stamping sheet is continuously stamped, the position of the subsequent sheet to be stamped just falls on the pattern groove (401); the lower surface of the pressing plate (5) is also provided with a matching pattern groove (401), and the two sides of the lower surface of the pressing plate (5) are provided with material edge grooves (501) adapted to the burrs on the two edges of the stamping sheet, and the upper surfaces of the die (4) and the die insert (27) are also provided with material edge grooves (501) adapted to the burrs on the two edges of the stamping sheet; The die assembly is provided with an avoidance groove (402) on the upper surface of the discharge side for avoiding burrs. The shape of the avoidance groove (402) matches the shape of the lower surface of the compressor intermediate plate blank obtained by stamping. The depth of the avoidance groove (402) is 0.3 mm. When the stamping sheets are continuously stamped, the punched portion of the front stamping sheet falls exactly on the avoidance groove (402).

6. The fine blanking process for the compressor intermediate plate blank according to claim 5, characterized in that: The diameter of the 1# middle through hole (161) is larger than the diameter of the middle coaxial through hole, and the outer diameter of the φ31.2 hole upper push rod II (15) is larger than the outer diameter of the φ31.2 hole upper push rod I (14); the corners of the upper template (7) and the corners of the lower template (1) are both provided with punching guide holes (79) for limiting and guiding during punching; the punching guide holes (79) are matched and sleeved on the guide pillars (19).

7. The fine blanking process for the compressor intermediate plate blank according to claim 5, characterized in that: The bottom of the die (4) is provided with a bottom groove (49), the bottom groove (49) is located below the through-groove (271), the width of the bottom groove (49) is greater than the width of the through-groove (271), a die insert pad (28) is provided in the bottom groove (49), the die insert pad (28) and the die insert (27) are connected as a whole by a die insert screw (273); the die (4) presses the die insert pad (28) against the upper surface of the lower fixed plate (3), and a second punching movable hole (276) is provided on the die insert pad (28) that matches the punching movable hole (275) of the die insert (27) and is superimposed on each other.

8. The fine blanking process for the compressor intermediate plate blank according to claim 7, characterized in that: The lower fixing plate (3) is provided with a screw head hole (274), the position of the screw head hole (274) matches and corresponds to the position of the die insert screw (273), and the screw head of the die insert screw (273) is located in the screw head hole (274).

9. The fine blanking process for the compressor intermediate plate blank according to claim 8, characterized in that: The die (4) is provided with two through-grooves (271), the two through-grooves (271) are arranged one behind the other and are arranged to intersect each other end to end in a left-right direction, and the two through-grooves (271) are connected at their intersecting locations; The concave die inserts (27) are two pieces, which are respectively fixed in the insert through grooves (271) of the concave die (4); The back pressure plate (37), the lower force transmission rod I (29), the lower force transmission rod II (30), the φ31.2 round hole punch (34), the φ7 round hole punch (35) and the φ9.5 round hole punch (36) constitute a back pressure lifting plate assembly, the back pressure lifting plate assembly consists of two pieces, wherein the back pressure plates (37) are respectively arranged in the punching movable holes (275) of the corresponding die inserts (27) to form a double-station lower die assembly with a double-station structure; Similarly, the male and female dies (16), the φ7 hole upper ejector rod I (10), the φ9.5 hole upper ejector rod I (11), the φ7 hole upper ejector rod II (12), the φ9.5 hole upper ejector rod II (13), the φ31.2 hole upper ejector rod I (14) and the φ31.2 hole upper ejector rod II (15) constitute an upper male and female die assembly. The upper male and female die assembly consists of two pieces, forming a double-station upper die assembly that matches the double-station lower die assembly.

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