CN116765276A - High-precision C-shaped workpiece extrusion molding method and molding progressive die - Google Patents
High-precision C-shaped workpiece extrusion molding method and molding progressive die Download PDFInfo
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- CN116765276A CN116765276A CN202311072647.0A CN202311072647A CN116765276A CN 116765276 A CN116765276 A CN 116765276A CN 202311072647 A CN202311072647 A CN 202311072647A CN 116765276 A CN116765276 A CN 116765276A
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- 230000000750 progressive effect Effects 0.000 title claims abstract description 20
- 238000000034 method Methods 0.000 title claims abstract description 17
- 238000000465 moulding Methods 0.000 title claims abstract description 13
- 238000001125 extrusion Methods 0.000 title claims abstract description 12
- 239000000463 material Substances 0.000 claims abstract description 60
- 238000005096 rolling process Methods 0.000 claims abstract description 43
- 238000004080 punching Methods 0.000 claims abstract description 31
- 238000007493 shaping process Methods 0.000 claims abstract description 20
- 238000005520 cutting process Methods 0.000 claims abstract description 19
- 238000013461 design Methods 0.000 claims abstract description 12
- 238000009966 trimming Methods 0.000 claims abstract description 10
- 238000012545 processing Methods 0.000 claims abstract description 7
- 239000002699 waste material Substances 0.000 claims description 19
- 238000007599 discharging Methods 0.000 claims description 12
- 238000003825 pressing Methods 0.000 claims description 8
- 238000010438 heat treatment Methods 0.000 abstract description 9
- 238000009826 distribution Methods 0.000 abstract description 3
- 238000003672 processing method Methods 0.000 abstract description 2
- 239000011230 binding agent Substances 0.000 description 7
- 238000010586 diagram Methods 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 239000004484 Briquette Substances 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005056 compaction Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D53/00—Making other particular articles
- B21D53/16—Making other particular articles rings, e.g. barrel hoops
- B21D53/18—Making other particular articles rings, e.g. barrel hoops of hollow or C-shaped cross-section, e.g. for curtains, for eyelets
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D35/00—Combined processes according to or processes combined with methods covered by groups B21D1/00 - B21D31/00
- B21D35/002—Processes combined with methods covered by groups B21D1/00 - B21D31/00
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D37/00—Tools as parts of machines covered by this subclass
- B21D37/08—Dies with different parts for several steps in a process
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Press Drives And Press Lines (AREA)
Abstract
The invention belongs to the technical field of stamping processing, and relates to a high-precision C-shaped workpiece extrusion molding method and a molding progressive die, wherein the processing method comprises the following steps: punching positioning holes, cutting the outer edges, cutting the side edges, rolling in steps, extruding, shaping and blanking. The forming progressive die comprises an upper die and a lower die, and a locating hole punching unit, a trimming unit, a rolling unit, a shaping unit and a blanking unit are sequentially arranged along the conveying direction of the material belt. The process comprises the steps of properly elongating the width of a forming area, designing a shaping unit according to the structure of the C-shaped workpiece, and forcibly compressing the elongated C-shaped structure to a target arc length after rolling, wherein the shape of the C-shaped workpiece is the same as the design structure because the thickness of the material is limited, but the material is compressed to be more compact, and the stress distribution is more uniform. Under the condition, the C-shaped workpiece is subjected to heat treatment, so that the thermal expansion can be controlled, the gap precision can be kept to +/-0.1 mm, and the precision requirement is met.
Description
Technical Field
The invention relates to the technical field of stamping processing, in particular to a high-precision C-shaped workpiece extrusion forming method and a forming progressive die.
Background
Metal stamping is a common process for processing many metal products, and with the diversification of customer demands, the design of the mold also meets various product demands.
The C-shaped workpiece 1 in fig. 1 is a rounded rigid product, and a gap exists between both ends of the C-shaped workpiece 1. The C-shaped workpiece 1 can be delivered after heat treatment, and the dimensional accuracy of a gap after heat treatment is required to reach +/-0.1 mm. The rolling process is manufactured by pressing a planar material into an arc shape, so that the inner circumference of the material is always larger than the outer circumference Zhou Jincou in the forming process, and the stress is uneven, so that the gap size is obviously increased along with the release of the stress after the heat treatment, and the precision requirement is not met.
Taiwan patent TW543538U discloses a process for manufacturing a tube bundle by using a stepwise rolling process, where the tube bundle is actually a C-shaped clip tightened by a connecting member, and because the use of the C-shaped clip has the problem of tightening and adjusting, the size of the gap does not affect the use, so that there is no requirement on the precision of the gap structure, and the problem of deformation due to heat treatment is not considered.
The present company applied for a chinese patent CN207026197U, which discloses an overpass type rolling device, which adopts a part structure that uses an integral molding insert to convert the material from a half-rolled shape to a cylindrical shape. However, only structural requirements after stamping of the parts are considered, and the problem that the parts meet the precision requirements after heat treatment is not further considered.
It is therefore necessary to devise a new molding method to solve the above problems.
Disclosure of Invention
The invention mainly aims to provide a high-precision C-shaped workpiece extrusion forming method, which can ensure that the C-shaped workpiece can also ensure the gap precision of +/-0.1 mm after heat treatment on the premise of ensuring the stamping structure precision of the C-shaped workpiece.
The invention realizes the aim through the following technical scheme: a high-precision C-shaped workpiece extrusion molding method comprises the following steps:
s1, punching a positioning hole: cutting a central positioning hole and two side positioning holes on the material belt by taking two sides of the material belt as positioning references, wherein the range of a processing unit comprises a forming area extending along the direction of the material belt, a connection retaining area connecting the middle parts of adjacent forming areas and a waste area positioned at the periphery of the forming area in design, the central positioning hole is positioned in the connection retaining area, and the two side positioning holes are positioned at two sides of the central positioning hole and are positioned in the range of the waste area;
s2, cutting the outer edge: cutting the outer contour of a forming area positioned at two sides of the material belt by taking two side positioning holes as positioning references, wherein the width of the forming area is 0.5-1% larger than the designed arc of the C-shaped workpiece;
s3, cutting the side edges: cutting off all waste material areas by taking the central positioning hole as a positioning reference;
s4, step-by-step rounding: taking the central positioning hole as a positioning reference, stamping and rounding the forming area from two sides to the middle for multiple times, deforming one section of the forming area from a planar structure to an arc structure by stamping each time, deforming the middle part of the forming area to an arc structure and surrounding the arc structure on a rounding insert, wherein the axis of the rounding insert is parallel to the conveying direction of the material belt, the radiuses of all the arc structures are equal, and the forming area is C-shaped and two ends are not contacted;
s5, extrusion shaping: taking the central positioning hole as a positioning reference, taking the rolling insert as an inner core, extruding the forming area into a C-shaped workpiece with a C-shaped structure and arc length equal to the designed arc length;
s6, blanking: and taking the central positioning hole as a positioning reference, and punching the connection retaining area to drop the C-shaped workpiece.
Another main object of the present invention is to provide a continuous molding die capable of realizing the above processing method.
The invention realizes the aim through the following technical scheme: a forming progressive die comprises an upper die and a lower die, and is sequentially provided with a positioning hole punching unit, a trimming unit, a rounding unit, a shaping unit and a blanking unit along the conveying direction of a material belt;
the trimming unit comprises two side punching cutters and two strip punching cutters which are positioned on the upper die, the two strip punching cutters are positioned flush and positioned in the discharging direction of the two side punching cutters, the lower die is provided with a plurality of rim charge discharging holes which are respectively matched with the two side punching cutters and the two strip punching cutters, and the distance between the two side punching cutters is 0.5-1% longer than the design arc of the C-shaped workpiece;
the lower die is provided with a rolling insert extending from the rolling unit to the blanking unit, the axis of the rolling insert is along the conveying direction of the material belt, the front part of the rolling insert is fixed on the lower die, the middle and rear parts of the rolling insert are suspended, and the lower part of the shaping unit area is provided with a clearance limiting lug;
the rolling unit comprises a plurality of groups of side arc punches arranged on the upper die in pairs, a middle arc punch arranged above the rolling insert and progressive arc material supporting grooves arranged on two sides of the lower die, and the progressive arc material supporting grooves are in concave-convex fit with the side arc punches;
the shaping unit comprises an arc-shaped pressing block positioned on the upper die and an arc-shaped supporting block positioned on the lower die, and the arc-shaped pressing block and the arc-shaped supporting block are positioned at the upper and lower relative positions of the rolling insert;
the blanking unit comprises a connecting material punch head opposite to the connecting material waste discharging hole, a downward guide convex column is arranged on the connecting material punch head, and the rolling insert is provided with the connecting material waste discharging hole in the blanking unit area.
Specifically, the punching positioning hole unit comprises three hole punches positioned on the upper die, and blanking holes are formed in the lower die at corresponding positions of the hole punches.
Specifically, a guide groove is arranged in front of the positioning hole punching unit.
Specifically, a blanking chute is arranged behind the blanking unit.
The technical scheme of the invention has the beneficial effects that:
the process does not directly determine the width of the forming area according to the arc length of the C-shaped workpiece, but firstly properly lengthens the width of the forming area, then designs the shaping unit according to the structure of the C-shaped workpiece, after the rolling, the lengthened C-shaped structure is forcedly compressed to the target arc length, and the shape of the C-shaped workpiece is the same as the design structure (the gap precision is +/-0.03 mm) because the thickness of the material is limited, but the material is compressed to be more compact, and the stress distribution is more uniform. Under the condition, the C-shaped workpiece is subjected to heat treatment, so that the thermal expansion can be controlled, the gap precision can be kept to +/-0.1 mm, and the precision requirement is met.
Drawings
FIG. 1 is a perspective view of a C-shaped workpiece;
FIG. 2 is a diagram showing the structural change of the tape (black parts in the figure represent cut-out areas);
FIG. 3 is a perspective view of a molding progressive die;
FIG. 4 is a partial perspective view of the upper die;
FIG. 5 is a partial perspective view of the lower mold;
FIG. 6 is a partial rear view of the lower die in position of the rolling insert;
FIG. 7 is a block diagram of the forming zone (dashed lines in the figure indicate where the profile is when the C-shaped workpiece is spread, and solid lines indicate the actual profile of the forming zone).
Marked in the figure as:
the device comprises a 1-C-shaped workpiece, a 10-material belt, a 11-forming area, a 12-connection retaining area, a 121-center positioning hole, a 13-waste area and a 131-side positioning hole;
2-a continuous molding die for molding the plastic material,
21-upper die, 211-hole punch, 212 a-side locating pin, 212 b-middle locating pin, 213 a-side punch, 213 b-strip punch, 214 a-first side arc punch, 214 b-second side arc punch, 214 c-third side arc punch, 214 d-fourth side arc punch, 215-middle arc punch, 216-arc briquette, 217-binder punch, 2171-pilot boss;
22-lower die, 221-positioning hole, 222-rim charge waste discharge hole, 223-progressive arc material supporting groove, 224-round insert, 2241-clearance limit bump, 2242-connecting material waste discharge hole and 225-arc supporting block;
23-a guiding slot, in which the guiding slot,
24-blanking chute.
Detailed Description
The present invention will be described in further detail with reference to specific examples.
Examples:
as shown in fig. 3, a forming progressive die 2 of the present invention includes an upper die 21 and a lower die 22, and is provided with a guide groove 23, a positioning hole punching unit, a trimming unit, a rounding unit, a shaping unit, a blanking unit and a blanking chute 24 in order along the conveying direction of a material belt 10;
as shown in fig. 4 and 5, the upper die 21 is provided with a plurality of pairs of side positioning pins 212a with upper tips and lower thicknesses along the conveying direction of the material belt 10 in the trimming unit area, the upper die 21 is provided with a plurality of middle positioning pins 212b with upper tips and lower thicknesses along the conveying direction of the material belt 10 in the trimming unit-to-rounding unit area, and the lower die 22 is provided with a plurality of limiting holes 221 matching the positions of the side positioning pins 212a and the middle positioning pins 212 b;
as shown in fig. 4 and 5, the positioning hole punching unit includes three hole punches 211 positioned on the upper die 21, and the lower die 22 is provided with blanking holes (not labeled) at corresponding positions of the hole punches 211;
as shown in fig. 4 and 5, the trimming unit includes two side punches 213a and two strip punches 213b located on the upper die 21, the two strip punches 213b are located at the same level and located in the discharging direction of the two side punches 213a, the lower die 22 is provided with a plurality of scrap discharging holes 222 respectively matching the two side punches 213a and the two strip punches 213b, and the distance between the two side punches 213a is 0.5-1% longer than the design arc of the C-shaped workpiece 1;
as shown in fig. 4 to 6, the lower die 22 is provided with a rolling insert 224 extending from the rolling unit to the blanking unit, the axis of the rolling insert 224 is along the conveying direction of the material belt 10, the front part of the rolling insert 224 is fixed on the lower die 22, the middle rear part of the rolling insert 224 is suspended, and the lower part of the shaping unit area is provided with a clearance limiting bump 2241;
as shown in fig. 4 and 5, the rolling unit includes several sets of side arc punches (a first side arc punch 214a, a second side arc punch 214b, a third side arc punch 214c, a fourth side arc punch 214 d) provided in pairs on the upper die 21, a middle arc punch 215 located above the rolling insert 224, and progressive arc stock grooves 223 provided on both sides of the lower die 22, the progressive arc stock grooves 223 being in concave-convex fit with the side arc punches;
as shown in fig. 4 and 5, the shaping unit includes an arc-shaped pressing block 216 located on the upper die 21 and an arc-shaped supporting block 225 located on the lower die 22, wherein the arc-shaped pressing block 216 and the arc-shaped supporting block 225 are located at upper and lower opposite positions of the rolling insert 224;
as shown in fig. 4 and 5, the blanking unit includes a binder punch 217 opposite to a binder waste discharge hole 2242, a downward guide boss 2171 is provided on the binder punch 217, and the rolling insert 224 is provided with a binder waste discharge hole 2242 in the blanking unit area.
As shown in fig. 2 to 6, the method for extrusion molding of a high-precision C-shaped workpiece according to the present invention comprises the steps of:
s1, punching a positioning hole: with the two sides of the material belt 10 as positioning references, a central positioning hole 121 and two side positioning holes 131 are cut on the material belt 10, the range of the processing unit comprises a forming area 11 extending along the width direction of the material belt 10, a connection retaining area 12 connecting the middle parts of adjacent forming areas 11 and a waste area 13 positioned at the periphery of the forming area 11 in design, the central positioning hole 121 is positioned in the connection retaining area 12, and the two side positioning holes 131 are positioned at the two sides of the central positioning hole 121 and are positioned in the range of the waste area 13.
The guiding groove 23 is located before the positioning hole punching unit for guiding the material belt 10 through the progressive die in a determined direction when the material belt 10 is conveyed. One center positioning hole 121 and two side positioning holes 131 on the material tape 10 are punched by three hole punches 211, and hole scraps are discharged from the lower die 22.
The connection-retaining region 12 serves to keep the forming region 11 continuous during processing until the connection-retaining region 12 is severed. The center positioning hole 121 serves as a positioning reference for the entire stamping process. The two side positioning holes 131 serve as positioning references for the trimming step.
S2, cutting the outer edge: the side positioning pins 212a cut the outer contours of the forming areas 11 positioned on the two sides of the material belt 10 by taking the two side positioning holes 131 as positioning references, and the width of the forming areas 11 is 0.5-1% larger than the designed arc of the C-shaped workpiece 1.
The side locating pins 212a are matched with part of the limiting holes 221, the side locating holes 131 closer to the edge of the material belt 10 are used for locating, then the outer contour of the forming area 11 is cut, the accuracy is better, and the outer contour of the forming area 11 conforms to the outer contour of the two ends of the C-shaped workpiece 1.
The waste material cut in this step is very narrow, so that concentrated punching force is needed for fine cutting, and the rest is not cut, so that the material belt 10 can be kept in a good plane structure, and edge deformation is avoided. But here the shaping zone 11 is deliberately increased by a suitable width to provide a compressive deformation margin for the subsequent shaping step.
S3, cutting the side edges: the middle positioning pin 212b cuts out all the scrap region 13 with the center positioning hole 121 as a positioning reference.
The scrap portions cut by the outer edge cutting step and the side edge cutting step generally constitute scrap region 13. The outer contour of the forming area 11 is formed by a side punch 213a, the remaining part of the scrap area 13 after the outer edge is cut by a strip punch 213b, and twice punched scraps are discharged from different scrap discharge holes 222.
In the case of the outer profile being formed, the surrounding portions of the side positioning holes 131 are cut out, so that the material strip 10 becomes a planar fishbone structure, and both ends of the forming area 11 are in a semi-suspended state.
S4, step-by-step rounding: the middle positioning pin 212b takes the center positioning hole 121 as a positioning reference, the forming area 11 is rolled up from two sides to the middle through multiple times of stamping, one section of the forming area 11 is deformed from a planar structure to an arc structure through each time of stamping, and finally the middle part of the forming area 11 is deformed to an arc structure and is enclosed on the rolling insert 224, the axis of the rolling insert 224 is parallel to the conveying direction of the material belt 10, the radiuses of all the arc structures are equal, the forming area 11 is changed into a C shape, and two ends of the C shape are not contacted.
The first side arc punch 214a, the second side arc punch 214b, the third side arc punch 214C and the fourth side arc punch 214d are sequentially arranged on two sides of the upper die 21 in pairs, each time stamping can change a section of forming area 11 into an arc shape through the cooperation of two progressive arc material supporting grooves 223, the deformation area gradually approaches the middle, and finally the position near the connecting and retaining area 12 is changed into an arc shape through the middle arc punch 215, so that the forming area 11 is changed into a C-shaped structure. In practice, the number of pairs of side arcuate punches may be increased or decreased depending on the size of the forming zone 11.
When the step-wise rounding is completed, the forming zone 11 surrounds the rounding insert 224, and a gap slightly larger than the width of the gap limit bump 2241 is left between the two ends of the forming zone 11, so that the forming unit can continue to pass through.
S5, extrusion shaping: the middle positioning pin 212b takes the center positioning hole 121 as a positioning reference, takes the rolling insert 224 as an inner core, and presses the forming area 11 into a C-shaped workpiece 1 with a C-shaped structure and an arc length equal to the designed arc length.
The spacing bump 2241 of clearance limits the interval between two ends of the forming area 11, adopts the rolling insert 224 to support the intrados of the C-shaped structure, and the arc support 225 and the arc pressing block 216 cooperate to extrude the extrados of the C-shaped structure, so as to obtain the C-shaped workpiece 1 with the C-shaped structure and the arc length equal to the designed arc length.
Since the forming zone 11 is left with a 0.5-1% increase in width during the outer edge cutting step, the theoretical arc length of the C-shaped structure is also 0.5-1% greater than the arc length of the C-shaped workpiece 1, and the extrusion shaping reduces the arc length of the forming zone 11 to the arc length of the C-shaped workpiece 1 with the clearance stop bumps 2241, which results in compaction of the material of the forming zone 11 and an increase in density, and the internal stress of the material is also distributed relatively uniformly.
S6, blanking: the middle positioning pin 212b uses the center positioning hole 121 as a positioning reference to punch off the connection retaining area 12, so that the C-shaped workpiece 1 falls down.
Blanking is accomplished with the binder punch 217 and the pilot boss 2171 is part of the binder punch 217. The guide boss 2171 passes through the central positioning hole 121 to be positioned, and then the connecting material punch 217 cuts off the connecting and retaining area 12 when the die assembly is continued, the connecting and retaining area 12 falls from the connecting material waste discharging hole 2242, and the forefront C-shaped workpiece 1 also slides from the discharging chute 24.
The process does not directly determine the width of the forming area 11 according to the arc length of the C-shaped workpiece 1, but firstly properly stretches the width of the forming area 11, then designs a shaping unit according to the structure of the C-shaped workpiece 1, after the rolling, the stretched C-shaped structure is forcedly compressed to the target arc length, and the shape of the C-shaped workpiece 1 is the same as the design structure (the gap precision is +/-0.03 mm) because the thickness of the material is limited, but the material is compressed to be more compact, and the stress distribution is more uniform. Under the condition, the C-shaped workpiece 1 is subjected to heat treatment, so that the thermal expansion is controlled, the gap precision can be kept to +/-0.1 mm, and the precision requirement is met.
What has been described above is merely some embodiments of the present invention. It will be apparent to those skilled in the art that various modifications and improvements can be made without departing from the spirit of the invention.
Claims (5)
1. A high-precision C-shaped workpiece extrusion molding method is characterized in that: the method comprises the following steps:
s1, punching a positioning hole: cutting a central positioning hole and two side positioning holes on the material belt by taking two sides of the material belt as positioning references, wherein the range of a processing unit comprises a forming area extending along the direction of the material belt, a connection retaining area connecting the middle parts of adjacent forming areas and a waste area positioned at the periphery of the forming area in design, the central positioning hole is positioned in the connection retaining area, and the two side positioning holes are positioned at two sides of the central positioning hole and are positioned in the range of the waste area;
s2, cutting the outer edge: cutting the outer contour of a forming area positioned at two sides of the material belt by taking two side positioning holes as positioning references, wherein the width of the forming area is 0.5-1% larger than the designed arc of the C-shaped workpiece;
s3, cutting the side edges: cutting off all waste material areas by taking the central positioning hole as a positioning reference;
s4, step-by-step rounding: taking the central positioning hole as a positioning reference, stamping and rounding the forming area from two sides to the middle for multiple times, deforming one section of the forming area from a planar structure to an arc structure by stamping each time, deforming the middle part of the forming area to an arc structure and surrounding the arc structure on a rounding insert, wherein the axis of the rounding insert is parallel to the conveying direction of the material belt, the radiuses of all the arc structures are equal, and the forming area is C-shaped and two ends are not contacted;
s5, extrusion shaping: taking the central positioning hole as a positioning reference, taking the rolling insert as an inner core, extruding the forming area into a C-shaped workpiece with a C-shaped structure and arc length equal to the designed arc length;
s6, blanking: and taking the central positioning hole as a positioning reference, and punching the connection retaining area to drop the C-shaped workpiece.
2. A molding progressive die, characterized in that: the device comprises an upper die and a lower die, and a positioning hole punching unit, a trimming unit, a rolling unit, a shaping unit and a blanking unit are sequentially arranged along the conveying direction of a material belt;
the trimming unit comprises two side punching cutters and two strip punching cutters which are positioned on the upper die, the two strip punching cutters are positioned flush and positioned in the discharging direction of the two side punching cutters, the lower die is provided with a plurality of rim charge discharging holes which are respectively matched with the two side punching cutters and the two strip punching cutters, and the distance between the two side punching cutters is 0.5-1% longer than the design arc of the C-shaped workpiece;
the lower die is provided with a rolling insert extending from the rolling unit to the blanking unit, the axis of the rolling insert is along the conveying direction of the material belt, the front part of the rolling insert is fixed on the lower die, the middle and rear parts of the rolling insert are suspended, and the lower part of the shaping unit area is provided with a clearance limiting lug;
the rolling unit comprises a plurality of groups of side arc punches arranged on the upper die in pairs, a middle arc punch arranged above the rolling insert and progressive arc material supporting grooves arranged on two sides of the lower die, and the progressive arc material supporting grooves are in concave-convex fit with the side arc punches;
the shaping unit comprises an arc-shaped pressing block positioned on the upper die and an arc-shaped supporting block positioned on the lower die, and the arc-shaped pressing block and the arc-shaped supporting block are positioned at the upper and lower relative positions of the rolling insert;
the blanking unit comprises a connecting material punch head opposite to the connecting material waste discharging hole, a downward guide convex column is arranged on the connecting material punch head, and the rolling insert is provided with the connecting material waste discharging hole in the blanking unit area.
3. The molding progressive die of claim 2, wherein: the punching positioning hole unit comprises three hole punches located on the upper die, blanking holes are formed in the lower die at corresponding positions of the hole punches, and the three hole punches are used for cutting a center positioning hole and two side positioning holes.
4. The molding progressive die of claim 2, wherein: and a guide groove is arranged in front of the positioning hole punching unit.
5. The molding progressive die of claim 2, wherein: and a blanking chute is arranged behind the blanking unit.
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| CN202311072647.0A CN116765276B (en) | 2023-08-24 | 2023-08-24 | High-precision C-shaped workpiece extrusion molding method and molding progressive die |
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| CN116765276B CN116765276B (en) | 2023-11-28 |
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