CN115214068B - Machining die and machining method for forming holes - Google Patents
Machining die and machining method for forming holes Download PDFInfo
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- CN115214068B CN115214068B CN202110450336.8A CN202110450336A CN115214068B CN 115214068 B CN115214068 B CN 115214068B CN 202110450336 A CN202110450336 A CN 202110450336A CN 115214068 B CN115214068 B CN 115214068B
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- 238000000034 method Methods 0.000 title claims abstract description 25
- 238000003754 machining Methods 0.000 title description 10
- 238000000748 compression moulding Methods 0.000 claims abstract description 15
- 238000012545 processing Methods 0.000 claims abstract description 13
- 230000002093 peripheral effect Effects 0.000 claims abstract description 3
- 230000008569 process Effects 0.000 abstract description 15
- 239000002994 raw material Substances 0.000 abstract description 5
- 238000004519 manufacturing process Methods 0.000 abstract description 3
- 239000002699 waste material Substances 0.000 abstract description 3
- 238000003672 processing method Methods 0.000 abstract description 2
- 238000004080 punching Methods 0.000 abstract description 2
- 230000009467 reduction Effects 0.000 description 35
- 238000000465 moulding Methods 0.000 description 25
- 238000005553 drilling Methods 0.000 description 11
- 239000000463 material Substances 0.000 description 6
- 238000010586 diagram Methods 0.000 description 4
- 239000000835 fiber Substances 0.000 description 3
- 239000003365 glass fiber Substances 0.000 description 3
- 239000011347 resin Substances 0.000 description 2
- 229920005989 resin Polymers 0.000 description 2
- 229920002748 Basalt fiber Polymers 0.000 description 1
- 229920000049 Carbon (fiber) Polymers 0.000 description 1
- 208000034693 Laceration Diseases 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 229920006231 aramid fiber Polymers 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000004917 carbon fiber Substances 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 239000000805 composite resin Substances 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 229910003460 diamond Inorganic materials 0.000 description 1
- 239000010432 diamond Substances 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 1
- 238000012797 qualification Methods 0.000 description 1
- 239000011208 reinforced composite material Substances 0.000 description 1
- 238000004901 spalling Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 229920001169 thermoplastic Polymers 0.000 description 1
- 229920001187 thermosetting polymer Polymers 0.000 description 1
- 239000004416 thermosoftening plastic Substances 0.000 description 1
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
- B29C43/32—Component parts, details or accessories; Auxiliary operations
- B29C43/36—Moulds for making articles of definite length, i.e. discrete articles
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C37/00—Component parts, details, accessories or auxiliary operations, not covered by group B29C33/00 or B29C35/00
- B29C37/02—Deburring or deflashing
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
- B29C43/32—Component parts, details or accessories; Auxiliary operations
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Shaping Metal By Deep-Drawing, Or The Like (AREA)
Abstract
The invention provides a processing die and a processing method for a forming hole, wherein the die comprises an upper die and a lower die, the upper die comprises a first bulge, the lower die comprises a second bulge, after die assembly, gaps exist between the first bulge and the lower die, between the second bulge and the upper die and between the first bulge and the second bulge so as to form a flash, the position of the flash is the position of the hole to be processed, and the peripheral side of the flash is a reserved area after the hole is processed by a workpiece. The invention can omit CNC processing steps, simplify process flow, reduce hole making cost, save raw materials and reduce waste generation, can enable the work piece compression molding and punching procedures to be arranged at similar positions for assembly line operation, does not need to be separated by a certain distance, and reduces the production cost required by work piece circulation.
Description
Technical Field
The invention relates to the field of hole machining, in particular to a machining die and a machining method for forming holes.
Background
With the development of energy-saving, environment-friendly and light-weight technologies of automobiles, more and more battery pack upper shells are made of SMC glass fiber reinforced composite materials. Because the upper shell of the battery pack needs to be provided with the electric connector, the assembly surface between the upper shell and the lower shell of the battery pack is generally an inclined surface due to the structural avoidance requirement, and the upper shell and the lower shell can be fastened through bolts by arranging corresponding round holes at the inclined surface of the upper shell. In this design, a round hole is required to be formed at the corresponding inclined surface of the upper housing.
The scheme generally used in the prior art is as follows: firstly, a resin-based composite material is used for compression molding of an upper shell of a battery pack, after the upper shell is molded, the upper shell which is not perforated is placed on a CNC (computer numerical control) machine for drilling through a tool, and the scheme has the defects that:
1. the high temperature in the CNC machining process can soften the resin, even burn the resin, and reduce the yield of the workpiece;
2. because dust exists in the CNC drilling process, the environment is easily influenced, and a certain physical distance is ensured between the position of the compression molding process of the workpiece and the position of the CNC process, so that the cost of workpiece circulation is increased;
3. CNC drilling needs to be carried out by using a CNC machine, and corresponding tools are required to be designed, so that the drilling cost is high.
Disclosure of Invention
The invention provides a processing die for forming holes, which comprises an upper die and a lower die, wherein the upper die comprises a first bulge, the lower die comprises a second bulge, after die assembly, gaps are formed between the first bulge and the lower die, between the second bulge and the upper die and between the first bulge and the second bulge so as to form flash, the position of the flash is the position of a hole to be processed, and the peripheral side of the flash is a reserved area after the hole is processed on a workpiece.
Optionally, an included angle between the center line of the hole to be machined and the drawing direction line is equal to 0, a first height difference exists between the surface, close to the upper die side, of the reserved area connected with the flash, and a second height difference exists between the surface, close to the lower die side, of the reserved area connected with the flash;
when one side of the flash, which is close to the mounting surface of the fixing piece, is one side of the workpiece, which is close to the upper die, the first height difference is smaller than the second height difference;
when one side of the flash, which is close to the mounting surface of the fixing piece, is one side of the workpiece, which is close to the lower die, the second height difference is smaller than the first height difference.
Optionally, the first protrusion extends vertically from the upper die clamping side to the lower die clamping side, and the second protrusion extends vertically from the lower die clamping side to the upper die clamping side.
Optionally, an included angle between a center line of the hole to be processed and a drawing direction line is not equal to 0, the first bulge comprises a first edge forming surface and a first drag reduction forming surface, and the first edge forming surface and the first drag reduction forming surface are respectively positioned at two ends of the first bulge; the second bulge comprises a second edge forming surface and a second drag reduction forming surface, and the second edge forming surface and the second drag reduction forming surface are respectively positioned at two ends of the second bulge;
after die assembly, the first drag reduction molding surface and the second drag reduction molding surface are positioned between the first edge molding surface and the second edge molding surface.
Optionally, the first edge forming surface is perpendicular to the die-closing side of the upper die, the second edge forming surface is perpendicular to the die-closing side of the lower die, the first drag reduction forming surface forms an oblique angle with the upper die, the second drag reduction forming surface forms an oblique angle with the lower die, and the first drag reduction forming surface and the second drag reduction forming surface are parallel to each other.
Optionally, the flash includes a first connection portion formed between the first protrusion and the lower die, a second connection portion formed between the second protrusion and the upper die, and a drag reduction portion located between and connecting the first connection portion and the second connection portion.
Optionally, the first connecting portion and the second connecting portion have a height difference, a distance from a surface of the first connecting portion, which is close to one side of the lower die, to a surface of the second connecting portion, which is close to one side of the upper die, is equal to a hole depth of the machined hole, and the drag reduction portion is stepped with inclination relative to the first connecting portion and the second connecting portion.
Optionally, a surface of the first connecting portion on a side close to the lower die is flush with a corresponding surface of the reserved area close thereto, and a surface of the second connecting portion on a side close to the upper die is flush with a corresponding surface of the reserved area close thereto.
Optionally, the thickness of the first connection portion in a direction parallel to the center line of the hole to be machined is equal to the thickness of the second connection portion in a direction parallel to the center line of the hole to be machined.
The invention also provides a processing method of the forming hole, which adopts the forming hole processing die to process, and comprises the following steps:
closing the upper die and the lower die, so that gaps exist between a first bulge and the lower die which are arranged on the upper die, between a second bulge and the upper die which are arranged on the lower die and between the first bulge and the second bulge;
forming a workpiece with a hole to be machined by compression molding, forming a flash by utilizing the gap, and enabling a height difference to exist between the flash and a reserved area left after the hole is machined in the workpiece;
demolding the workpiece, and then removing the flash.
In summary, the beneficial effects brought by the invention are as follows:
1. the CNC processing step can be omitted, the process flow is simplified, and the hole making cost is reduced.
2. Saving raw materials, reducing waste material generation and reducing hole making cost.
3. The work piece compression molding and drilling processes can be arranged at similar positions to carry out assembly line operation, a certain distance is not needed to be separated, and the production cost required by work piece circulation is reduced.
The foregoing description is only an overview of the present invention, and is intended to be implemented in accordance with the teachings of the present invention, as well as the preferred embodiments thereof, together with the following detailed description of the invention, given by way of illustration only, together with the accompanying drawings.
Drawings
Fig. 1 is a schematic diagram of compression molding according to an embodiment of the invention.
Fig. 2 is a schematic diagram of an upper and lower die and a workpiece after compression molding according to an embodiment of the invention.
Fig. 3 is a schematic diagram of compression molding according to a second embodiment of the present invention.
Fig. 4 is a schematic diagram of drilling a workpiece according to the present invention.
Description of the reference numerals
1-upper die, 11, 5-first bulge, 111-first edge forming surface, 112-first drag reduction forming surface, 2-lower die, 21, 6-second bulge, 211-second edge forming surface, 212-second drag reduction forming surface,
3-work piece, 31-reserved area, 32-flash, 321-first connection, 322-second connection, 323-drag reduction,
4-drilling device.
a-drawing a die direction line, b-a center line of a hole to be processed and theta-an included angle.
Detailed Description
The following describes in further detail the embodiments of the present invention with reference to the drawings and examples. The following examples are illustrative of the invention and are not intended to limit the scope of the invention.
The terms first, second and the like in the description and in the claims, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order.
Embodiment one:
as shown in fig. 1 and 2, the present embodiment relates to a processing die for forming holes, which includes an upper die 1 and a lower die 2. The upper die 1 and the lower die 2 are used for forming a workpiece 3 through compression molding, the workpiece 3 is specifically a battery pack upper shell body of which the diameter of a hole to be processed is L1, and the included angle theta between the center line b of the hole to be processed at the position of the battery pack upper shell body, which is required to be perforated, and the drawing direction line a during compression molding is not equal to 0 degree. In particular, the drawings related to the present embodiment do not show the entire view of the work 3, but are merely for explaining the working principle of the working mold according to the present embodiment.
Specifically, the upper die 1 includes a first protrusion 11, and the lower die 2 includes a second protrusion 21. The first bulge 11 is ladder-shaped and extends from the die clamping side of the upper die 1 to the die clamping side of the lower die 2, and comprises a first edge forming surface 111 and a first drag reduction forming surface 112, wherein the first edge forming surface 111 and the first drag reduction forming surface 112 are respectively positioned at two ends of the first bulge 11, the first edge forming surface 111 is a plane perpendicular to the die clamping side of the upper die 1, and the first drag reduction forming surface 112 is an inclined plane which forms an angle with the die clamping side of the upper die 1.
The second protrusion 21 is formed in a ladder shape and is provided on the mold clamping side of the lower mold 2. The second protrusion 21 is formed by extending from the clamping side of the lower die 2 to the clamping side of the upper die 1, and includes a second edge forming surface 211 and a second drag reducing forming surface 212. The second edge forming surface 211 and the second drag reduction forming surface 212 are respectively positioned at two ends of the second bulge 21, the second edge forming surface 211 is a plane vertical to the die closing side of the lower die 2, and the second edge forming surface 211 is positioned at one side of the second bulge 21 away from the first drag reduction forming surface 112; the second drag reduction molding surface 212 is an inclined surface which forms an angle with the mold closing side of the lower mold 2, the second drag reduction molding surface 212 is positioned on one side of the second protrusion 21 close to the first drag reduction molding surface 112, and the first drag reduction molding surface 112 and the second drag reduction molding surface 212 are parallel to each other.
After the mold is closed, a gap exists between the first bulge 11 and the lower mold 2, a gap exists between the second bulge 21 and the upper mold 1, a gap exists between the first bulge 11 and the second bulge 21, and the first drag reduction molding surface 112 and the second drag reduction molding surface 212 are positioned between the first edge molding surface 111 and the second edge molding surface 211. In this way, the raw material forms the workpiece 3 with the reserved area 31 and the flash 32 in the cavity.
Specifically, the flash 32 is in a zigzag shape, and the overall length is L1, and the position of the flash on the workpiece 3 is the position of the round hole to be machined on the battery pack upper shell. The two ends of the flash 32 are respectively connected with a reserved area 31 positioned on the periphery of the round hole after the round hole is processed.
In the present embodiment, the flash 32 includes a first connecting portion 321 formed between the first protrusion 11 and the clamping side of the lower die 2, a second connecting portion 322 formed between the second protrusion 21 and the clamping side of the upper die 1, and a drag reducing portion 323 located between and connecting the first connecting portion 321 and the second connecting portion 322. The first connecting portion 321 and the second connecting portion 322 are respectively located at two ends of the flash 32, one side of the first connecting portion 321, which is close to the lower die 2, is smoothly connected with the reserved area 31 into a whole, so that the bottom surface of the first connecting portion 321 is flush with the bottom surface of the reserved area 31 correspondingly, one side of the second connecting portion 322, which is close to the upper die 1, is smoothly connected with the reserved area 31 into a whole, and the top surface of the second connecting portion 322 is flush with the top surface of the reserved area 31 correspondingly.
In particular, the drag reduction portion 323 located in the middle of the flash 32 has a stepped shape having a slope with respect to the first connecting portion 321 and the second connecting portion 322 due to the presence of the first drag reduction molding surface 112 and the second drag reduction molding surface 212. The drag reduction portion 323 can enable the included angle theta between the center line b of the hole to be processed and the drawing direction line a to be different from 0 degrees, and can ensure smooth demolding. Alternatively, the angle between the inclined surface of the drag reducing portion 323 near the upper die 1 side or the lower die 2 side and the drawing direction line a may be 1 ° to 3 °. On the flash 32, the thickness of the remaining portion is smaller than that of the reserved area 31 except for the drag reducing portion 323.
Specifically, due to the presence of the first protrusion 11 and the second protrusion 21, there is a difference in height between the first connection portion 321 and the second connection portion 322, and the thickness of either the first connection portion 321 or the second connection portion 322 in the direction of the center line b of the hole to be processed is smaller than the hole depth of the round hole after processing, that is, smaller than the thickness of the remaining area 31 of the workpiece 3; the distance between the surface of the first connecting portion 321 on the side close to the lower die 2 and the surface of the second connecting portion 322 on the side close to the upper die 1 is equal to the hole depth of the round hole after processing, that is, equal to the thickness of the remaining area 31 of the workpiece 3. After demolding, a first concave notch appears at the position where the flash 32 contacts the first protrusion 11, and a second concave notch appears at the position where the flash 32 contacts the second protrusion 21. The bottom of the first concave notch is at right angles to the side wall of the reserved region 31 near the reserved region 31 contacting the first edge molding surface 111 during mold closing, and at an angle to one side wall of the drag reduction portion 323 near the reserved region 31 contacting the first edge molding surface 111 during mold closing. The bottom of the second concave notch is at right angles to the side wall of the reserved region 31 near the reserved region 31 contacting the second edge molding surface 211 when mold clamping, and at an angle to one side wall of the drag reduction portion 323 near the reserved region 31 contacting the second edge molding surface 211 when mold clamping is away from the mold clamping. As described above, the inclined feature on the workpiece 3 ensures that the workpiece 3 is successfully demolded, while the right angle feature ensures that the workpiece 3 does not produce a negative angle of demolding during the demolding process, avoiding strain or spalling of the workpiece 3.
It can be understood that, due to the gaps between the first protrusion 11 and the lower die 2, the gaps between the second protrusion 21 and the upper die 1, and the gaps between the first protrusion 11 and the second protrusion 21, the excessive material flows to the positions where the gaps are located during the molding process, and the flash 32 is formed, and meanwhile, the glass fiber serving as the raw material is continuous due to the filling action, so that the reserved area 31 around the flash 32 is ensured to have good mechanical properties. In addition, as the redundant materials flow to the positions of the gaps, the possibility of poor edge overflow at other parts of the cavity is reduced, and the qualification rate of the finished product is ensured.
Preferably, in order to make the weight distribution of the flash 32 uniform and reduce the probability of occurrence of bad strain and laceration, the thickness of the first connecting portion 321 in the direction parallel to the center line b of the hole to be processed is equal to the thickness of the second connecting portion 322 in the direction parallel to the center line b of the hole to be processed by adjusting the shapes of the first protrusion 11 and the second protrusion 21.
Preferably, the thickness of the first connecting portion 321 in the direction parallel to the center line b of the hole to be processed is selected to be in the range of 0.5-1.5mm and not more than 1/3 of the depth of the hole to be processed; the thickness of the second connecting portion 322 in the direction parallel to the center line b of the hole to be processed is selected to be in the range of 0.5-1.5mm and not more than 1/3 of the depth of the hole to be processed.
Embodiment two:
the second embodiment relates to a molding hole processing mold similar to the first embodiment, and is based on the fact that the assembly surface between the upper and lower cases of the battery pack in the first embodiment is a plane.
As shown in fig. 3, specifically, the first protrusion 5 and the second protrusion 6 in the second embodiment are not identical in shape to the first protrusion 11 and the second protrusion 21 in the first embodiment, the first protrusion 5 and the second protrusion 6 in the present embodiment are both rectangular, and the edge line of the first protrusion 5 is aligned with the edge line of the second protrusion 6 in the thickness direction of the workpiece 3. Except for this, the first embodiment is similar to the second embodiment, and the description thereof is omitted. At this time, the included angle θ between the center line b of the hole to be machined and the drawing direction line a at the position where the hole is to be drilled in the workpiece 3 is equal to 0 °.
As shown in fig. 3, the first protrusion 5 extends from the clamping side of the upper die 1 vertically to the clamping side of the lower die 2, and a first level difference L2 is formed between the flash 32 and the surface of the remaining area 31 connected thereto, which is close to the upper die 1 side. The second protrusion 6 extends from the clamping side of the lower die 2 vertically to the clamping side of the upper die 1, so that a second level difference L3 exists between the flash 32 and the surface of the connecting reserved area 31 near the lower die 2 side, and the first level difference L2 is smaller than the second level difference L3.
The first level difference L2 is smaller than the second level difference L3, and is determined by the position of the mounting surface of the fixing member (such as a bolt) after the hole is formed. The mount mounting surface is specifically a surface where interaction force occurs between the reserved area 31 and the mount, and in this embodiment, the mount mounting surface is closer to the surface of the workpiece 3 on the side closer to the upper die 1. The setting is to make the work piece 3 in-process, and mounting face department inflow more fibre to promote the intensity of mounting face of mounting, reduce the probability of cracking in the compression molding in-process or during subsequent assembly use of mounting face of mounting. In addition, the first height difference L2 and the second height difference L3 can not only play a role in marking, facilitate the identification of the subsequent removing process, but also improve the possible burr phenomenon during the subsequent removing of the burrs 32.
Preferably, the first height difference L2 is selected in the range of 0.5-1.5mm.
Preferably, the flash 32 has a thickness in the direction of the center line b of the hole to be machined of not more than 1/3 of the depth of the hole to be machined.
In summary, the present invention also provides a method for machining a forming hole, and for convenience of description, the components overlapping with the designations in the first embodiment and the second embodiment will be described with reference to the numbers in the first embodiment. The method comprises the following steps:
closing an upper die 1 and a lower die 2, wherein a gap exists between the upper die and the lower die; in the present embodiment, a gap between the upper and lower molds is formed by the first protrusion 11 and the lower mold 2, the upper mold 1 and the second protrusion 21, and the interval between the first protrusion 11 and the second protrusion 21.
And (3) performing compression molding to form the flash 32 through a gap, and enabling a height difference to exist between the flash 32 and a reserved area 31 left after the hole is processed on the workpiece 3.
Specifically, firstly, the relation of the included angle between the center line of the hole to be machined and the drawing direction line is judged. In this embodiment, when the included angle between the center line of the hole to be machined and the drawing direction line is equal to 0, it is determined whether the mounting surface of the fixing member is located at the side of the workpiece close to the upper die or at the side of the lower die. Then, the flash 32 and the surface of the connecting reserved area 31 close to the upper die 1 are provided with a first height difference L2, the surface of the connecting reserved area 31 close to the lower die 2 is provided with a second height difference L3, and when the side of the flash 32 close to the mounting surface of the fixing piece is the side of the workpiece 3 close to the upper die 1, the first height difference L2 is smaller than the second height difference L3; when the side of the flash 32 near the mounting surface of the fixing member is the side of the workpiece 3 near the lower die 2, the second height difference L2 is smaller than the first height difference L3.
When the included angle between the center line of the hole to be machined and the drawing direction line is not equal to 0, a first concave notch is formed at the contact position of the flash 32 and the first bulge 11, and a second concave notch is formed at the contact position of the flash 32 and the second bulge 21. The bottom of the first concave notch is at right angles to the side wall of the reserved region 31 near the reserved region 31 contacting the first edge molding surface 111 during mold closing, and at an angle to one side wall of the drag reduction portion 323 near the reserved region 31 contacting the first edge molding surface 111 during mold closing. The bottom of the second concave notch is at right angles to the side wall of the reserved region 31 on the side of the reserved region 31 which is in contact with the second edge molding surface 211 during mold closing, and at an inclination angle to the side wall of the drag reduction portion 323 on the side of the reserved region 31 which is in contact with the second edge molding surface 211 during mold closing away from the mold closing.
With the above, after the burr 32 is formed, the work 3 is demolded, and then the burr 32 is removed. Specifically, as shown in fig. 4, the burr 32 is treated using the drilling apparatus 4. The drilling device 4 comprises an electric drill chuck and a grinding head, the grinding head is arranged on the electric drill chuck, the electric drill is manually operated, the grinding head moves towards the workpiece 3 along the direction of the center line b of the hole to be processed, the grinding head removes the flash 32, the drilling process of the workpiece 3 is completed, and the workpiece 3 with the hole is obtained.
Preferably, the speed of the grinding head moving towards the workpiece 3 is 100-250mm/min so as to ensure that the surrounding structure of the round hole is not damaged in the process of removing the flash 32.
Preferably, the rotation speed of the grinding head is 600r/min so as to avoid the influence of high-speed movement of the drill bit during the machining process on the structure of the hole.
Alternatively, the grinding head can be made of diamond material, and one skilled in the art can freely select grinding heads made of other materials according to the needs.
Alternatively, when the hole designed in the workpiece 3 is a square hole or other shaped hole, the drilling device 5 may be replaced with a file, which can be freely selected by those skilled in the art as desired.
In addition, it should be specifically noted that the technical solutions described in the first embodiment and the second embodiment are particularly applicable to the following situations:
1. the hole to be processed is a round hole or a slotted hole, and the diameter or the circular arc diameter of the hole to be processed is d 1 The thickness of the workpiece 3 at the periphery of the hole to be processed is t 1 The included angle between the center line b of the hole and the drawing direction line a is smaller than arctan (2 t 1 /d 1 ) Is the case for (a).
2. The hole to be processed is a square hole, and the side length of the hole to be processed is d 2 The thickness of the workpiece 3 at the periphery of the hole to be processed is t 2 The angle between the center line b of the hole and the drawing direction line a is smaller than arctan (t 2 /d 2 ) Is the case for (a).
3. The workpiece 3 is made of compression molding fiber reinforced thermosetting material or thermoplastic composite material, and the reinforced fiber is glass fiber, carbon fiber, aramid fiber or basalt fiber.
In summary, by arranging the first protrusion 11 and the second protrusion 21 on the upper die 1 and the lower die 2 respectively, the molded workpiece 3 is provided with the flash 32, the flash 32 generates corresponding concave notches due to the existence of the first protrusion 11 and the second protrusion 21, and then the flash 32 is removed by simple procedures to process the required hole on the workpiece 3, the invention has the following advantages:
1. the CNC processing step can be omitted, the process flow is simplified, and the hole making cost is reduced;
2. raw material usage is saved, waste material generation is reduced, and hole making cost is reduced;
3. the work piece compression molding and punching processes can be arranged at similar positions to carry out assembly line operation, a certain distance is not needed to be separated, and the production cost required by work piece circulation is reduced.
The foregoing is merely illustrative of the present invention, and the present invention is not limited thereto, and any person skilled in the art will readily recognize that variations or substitutions are within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (3)
1. The processing die for the forming hole is characterized by comprising an upper die and a lower die, wherein the upper die comprises a first bulge, the lower die comprises a second bulge, gaps are formed between the first bulge and the lower die, between the second bulge and the upper die and between the first bulge and the second bulge after die assembly, so that a flash is formed, the position of the flash is the position of the hole to be processed, and the peripheral side of the flash is a reserved area after the hole is processed by a workpiece; the included angle between the center line of the hole to be processed and the drawing direction line is equal to 0;
when the included angle between the center line of the hole to be machined and the drawing direction line is equal to 0, a first height difference exists between the surface of the retaining area connected with the flash, which is close to the upper die side, and a second height difference exists between the surface of the retaining area connected with the flash, which is close to the lower die side;
when one side of the flash, which is close to the mounting surface of the fixing piece, is one side of the workpiece, which is close to the upper die, the first height difference is smaller than the second height difference;
when one side of the flash, which is close to the mounting surface of the fixing piece, is one side of the workpiece, which is close to the lower die, the second height difference is smaller than the first height difference.
2. The mold for forming a hole according to claim 1, wherein the first protrusion is formed to extend vertically from the upper mold clamping side toward the lower mold clamping side, and the second protrusion is formed to extend vertically from the lower mold clamping side toward the upper mold clamping side.
3. A method for processing a molded hole using the molded hole processing die according to claim 1 or 2, comprising the steps of:
closing the upper die and the lower die, so that gaps exist between a first bulge and the lower die which are arranged on the upper die, between a second bulge and the upper die which are arranged on the lower die and between the first bulge and the second bulge;
forming a workpiece with a hole to be machined by compression molding, forming a flash by utilizing the gap, and enabling a height difference to exist between the flash and a reserved area left after the hole is machined in the workpiece;
demolding the workpiece, and then removing the flash.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110450336.8A CN115214068B (en) | 2021-04-25 | 2021-04-25 | Machining die and machining method for forming holes |
Applications Claiming Priority (1)
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| JPS6140121A (en) * | 1984-07-31 | 1986-02-26 | Dainichi Nippon Cables Ltd | Forming method of seal ring |
| JPS62160216A (en) * | 1986-01-08 | 1987-07-16 | Mazda Motor Corp | Method and device for in-mold coat |
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| CN115214068A (en) | 2022-10-21 |
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