TWI610730B - Manufacturing mold of hot-stamped component with negative angle - Google Patents

Abstract

A hot stamping forming die having a negative-angle structural component for solving the problem that a negative-angle structural component cannot be formed by hot stamping in the past. One of the molds that can be used to implement the hot stamping forming method of the negative-angle structural member of the present invention includes a rotating assembly disposed on the first mold and a slider disposed on the second mold, the first mold and the second mold During the relatively close proximity of the mold, the rotating assembly is first caused to rotate, and then the slider is slipped to form a negative angle structure for one end of a metal plate member.

Description

Hot stamping forming die with negative angle structural components

The present invention relates to a hot forming die, in particular to a hot stamping die having a negative-angle structural component, which is formed by a hot stamping process to form a component having a negative angle structure, and has high strength, high precision and the like. .

The application of hot stamping forming technology is common in plastic-shaped steel sheets, which are heated to austenitic state with good ductility and ductility, and then stamped and molded with hydraulic equipment, and simultaneously stamped and molded. Rapid in-mold quenching to obtain high-strength steel members with a uniform martensitic structure (tensile strength up to 1500 MPa grade); accordingly, parts made by the hot stamping process can have ultra-high strength, Advantages such as dimensional accuracy and stability.

However, since the hot stamping process has changed the material properties, the elongation of the material is greatly reduced after quenching, so the hot stamping process can only shape the workpiece to the desired shape at one time, and has the need for secondary processing and molding. The components of the formed structure, such as those having a negative angle structure, cannot be formed by a hot stamping process.

Referring to FIG. 1 , when a component having a negative angle structure is formed by a cold stamping technique, a sheet B which has been molded into a predetermined shape by a plurality of cold stamping processes is placed in a mold 9 from which the mold 9 is The upper mold 91 and the lower mold 92 further shape the curvature of the sheet B, and the press block 93 of the mold 9 is combined with the lateral punch 94 to punch the negative angle structure N of one end of the sheet B; Then, the pressing block 93, the lateral punch 94 and the upper mold 91 are sequentially retracted. The sheet B having the negative angle structure N can be removed.

However, in the process of molding a plurality of sheets B, the ductility of the sheet B may be gradually lowered due to work hardening to cause cracks, and a defective product may be formed, and the residual stress release after the sheet B is formed may also be caused. Rebound phenomenon. Therefore, the sheet B obtained by the cold stamping process can have a negative angle structure, but the process steps are numerous, which is not only energy-consuming and time-consuming, but also the strength of the formed part is still difficult to compare with the hot stamped parts, and the dimensional accuracy is And stability is often difficult to meet design requirements, so there is indeed a need to improve.

In order to solve the above problems, the present invention provides a hot stamping forming method and a mold having a negative-angle structural member, which can be formed into a one-time forming member having a negative angle structure by a hot stamping process.

The following directionality or its similar terms, such as "before", "after", "upper (top)", "lower", "inside", "outside", "side", etc. The directionality or the singularity of the present invention is intended to be illustrative only and not to limit the invention.

The hot stamping forming die with a negative-angle structural component of the present invention comprises: a first die, the first die is provided with a rotating component, the rotating component has a rotating block and an elastic abutting member, and the rotating block has a pushing end And a forming end, the forming end is provided with a forming surface, the elastic abutting member abuts the rotating block, and the opposite surfaces of the rotating block are respectively provided with an arc-shaped long groove adjacent to the forming end, and the long groove and the long groove are respectively a cooling channel inside the rotating block is connected, and a sealing gasket is disposed on an outer edge of each of the long grooves; a second die, the second die has a slider, and the slider is provided with a pressing surface, the first die and the first die When the second mold is relatively close to the dead point position, a forming angle of the negative angle forming cavity is formed between the forming surface of the rotating block and the pressing surface of the sliding block; and a cooling waterway system for cooling the first mold and the In the second mode, the cooling waterway system is provided with a water inlet passage communicating with one of the long slots of the rotating block, and another water outlet passage communicating with the other long slot of the rotating block.

Accordingly, the hot stamping forming die having the negative-angle structural component of the present invention can be used. The hot stamping process produces a part with a negative angle structure at one time, which not only has excellent process efficiency, but also enables the produced parts to have ultra high strength, dimensional accuracy and good stability.

Wherein, the first die is provided with a forming punch, and the second die is provided with a molding block, and a portion of the forming punch closest to the second die forms a clamping surface, and the second die is in the molding groove. A retractable top block is provided, the top block having a clamping surface opposite to the clamping surface of the forming punch; the structure has the effect of improving the positioning stability of the metal plate during the hot stamping process.

Wherein, the slider is adjacent to the molding block, and an elastic returning member is coupled to the sidewall of the molding block and abuts the slider; the structure can automatically reset the slider when it is not pressed.

Wherein the rotating block rotates along a supporting edge of the forming punch, and when the first die and the second die are relatively close to a dead center position, the forming end end of the rotating block and the supporting edge end of the forming punch The structure is such that when the metal plate is pressed, a small area of bending or indentation is not formed here, the damage caused by high stress concentration can be avoided, and the forming yield can be improved.

Wherein, the pushing end of the rotating block is provided with a pressing block for attaching a slope of the sliding block; the structure can smoothly push the sliding block to generate a slip, and the rotating block is prevented from colliding with the sliding block. Damaged, with the effect of extending the life of the mold.

The two opposite surfaces of the rotating block are respectively provided with an arc-shaped long groove adjacent to the forming end, and each of the long grooves communicates with a cooling passage inside the rotating block, and a sealing gasket is disposed on an outer edge of each of the long grooves. The cooling waterway system is provided with a water inlet passage communicating with one of the long slots, and another water outlet passage is connected to the other long slot; the structure causes the rotating block to rotate without squeezing or striking the water inlet passage and the water outlet passage, The water inlet channel and the water outlet channel can be maintained to smoothly guide the coolant into and out of the cooling channel.

〔this invention〕

1‧‧‧ first model

11‧‧‧Rotating components

111‧‧‧Rotating block

111a‧‧‧Pushing end

111b‧‧‧ formed end

112‧‧‧Flexible parts

113‧‧‧Resistance block

114‧‧‧Forming surface

115‧‧‧Long slot

116‧‧‧Cooling channel

117‧‧‧Sealing washer

12‧‧‧ Forming punch

121‧‧‧ clamping surface

122‧‧‧Support edge

2‧‧‧ second mode

21‧‧‧ Slider

211‧‧‧

212‧‧‧Bevel

22‧‧‧Elastic reset parts

23‧‧‧plastic block

231‧‧‧plastic trough

24‧‧‧ top block

241‧‧‧ clamping surface

3‧‧‧Cooling waterway system

31‧‧‧Water inlet channel

32‧‧‧Water outlet

C‧‧‧Negative angle forming cavity

N‧‧‧negative angle structure

R‧‧‧ recess

W‧‧‧metal plate

W’‧‧‧negative angle structural components

[Use]

9‧‧‧Mold

91‧‧‧上模

92‧‧‧Down

93‧‧‧Clamps

94‧‧‧lateral punch

B‧‧‧ plates

N‧‧‧negative angle structure

Fig. 1 is a schematic view showing a forming step of forming a member having a negative angle structure by a cold stamping technique.

Fig. 2 is a plan view showing the planar structure of an embodiment of the mold of the present invention.

Fig. 3 is a schematic view showing the planar structure of the mold of the present invention when the first mold and the second mold are relatively close to the dead center position.

Figure 3a: A partial enlarged view of Figure 3.

Fig. 4 is a schematic view showing the arrangement of the rotating block and the water inlet passage and the water outlet passage of the mold of the present invention.

Fig. 5 is a schematic view showing the implementation of the method of the present invention when a metal plate member is placed in a mold.

Figure 6 is a schematic view showing the implementation of the method of the present invention when the first mold is pressed down so that the rotating block is about to start rotating.

Figure 7: Schematic diagram of the method of the present invention for rotating the rotating block to the moment the slider is about to start.

Fig. 8 is a schematic view showing the implementation of the method of the present invention for forming a metal plate member into a negative-angle structure.

Figure 9 is a schematic view showing the planar structure of the negative-angle structural member produced by the method of the present invention.

The above and other objects, features, and advantages of the present invention will become more apparent from the aspects of the appended claims. The utility model relates to a hot stamping forming die with a negative angle structural component for implementing the hot stamping forming method of the negative angle structural component of the present invention, wherein the hot stamping forming die with the negative angle structural component substantially comprises a first die 1 a second mold 2 and a cooling water system 3, at least one of the first mold 1 and the second mold 2 can be driven relatively close to or away from each other, and the cooling water system 3 can be supplied with a coolant The first mold 1 and the second mold 2 are cooled.

The first die 1 is provided with a rotating component 11 having a rotating block 111 and an elastic resisting member 112. The rotating block 111 is provided with a recess R to form a pushing end on the side edge of the recess R. 111a and a forming end 111b, the pushing end 111a and the forming end 111b are respectively located on two sides of the rotating shaft of the rotating block 111, and the elastic abutting member 112 abuts the rotating block 111 and It is closer to the forming end 111b than to the pushing end 111a. Accordingly, when the pushing end 111a of the rotating block 111 is forced to rotate the rotating block 111, the rotating block 111 can be elastically deformed against the elastic abutting member 112, and is not subjected to the pushing end 111a of the rotating block 111. When the force is applied, the elastic resisting member 112 is elastically reset to push the rotating block 111 to rotate in the reverse direction.

The pressing end 111a of the rotating block 111 can be provided with a pressing block 113 for pressing against the second die 2. The forming end 111b of the rotating block 111 is provided with a forming surface 114 for rotating on the rotating block 111. When it is at a predetermined position, it cooperates with the second mold 2 to form a negative angle structure at one end of a metal plate member (details will be described later).

In addition, the first die 1 can also be provided with a forming punch 12 for clamping and positioning the metal plate member to be molded together with the second die 2. In this embodiment, a portion of the forming punch 12 closest to the second die 2 forms a clamping surface 121, and a supporting edge 122 of the forming punch 12 substantially conforms to a partial shape of the rotating block 111, so that the The rotating block 111 is rotatable along the supporting edge 122 of the forming punch 12; when the first die 1 and the second die 2 are relatively close to the dead center position (as shown in FIG. 3), the rotating block 111 The end of the forming end 111b is flush with the end of the supporting edge 122 of the forming punch 12.

The second die 2 has a slider 21 which is slidable in parallel. One side of the slider 21 is provided with a pressing surface 211, and the other side of the slider 21 is provided with a slope 212. The first die 1 and the first die 1 During the process of the second die 2 being relatively close, the pressing block 113 disposed at the end 111a of the rotating block 111 can be attached to the inclined surface 212, so that the slider 21 is pushed to generate a slip for the first die 1 When the second die 2 is relatively close to the dead center position (as shown in FIG. 3), a negative angle forming die is formed between the forming surface 114 of the rotating block 111 and the pressing surface 211 of the slider 21. Hole C (please refer to Figure 3a). In this embodiment, in order to enable the slider 21 to automatically slide back to the initial position when the mold is released, the second mold 2 may be provided with an elastic return member 22 to abut the slider 21; When the first die 1 is pushed to cause slippage, the elastic returning member 22 can be elastically deformed. When the slider 21 is not pushed by the first die 1, the elastic resetting capability of the elastic returning member 22 can be utilized. The slider 21 is caused to slide back to the initial position.

In addition, the second mold 2 can also be provided with a molding block 23, and the molding block 23 is provided with a molding groove 231 opposite to the forming punch 12, and is mainly used for molding the metal plate member except the negative angle structure. shape. In this embodiment, the second mold 2 can be further provided with a retractable top block 24 in the molding groove 231, and the top block 24 has a clamping surface 241 and a clamping of the forming punch 12. Face 121 is opposite. Before the first die 1 and the second die 2 are relatively close, the clamping surface 241 of the top block 24 can be aligned between the two ends of the metal plate member; the first die 1 and the second die 2 In the process of being relatively close, after the clamping surface 121 of the forming punch 12 and the clamping surface 241 of the top block 24 are clamped together, the top block 24 can follow the first die 1 Close to the second die 2 and gradually retracting into the molding groove 231. Moreover, the slider 21 is adjacent to the molding block 23, and the elastic returning member 22 is connectably positioned on the side wall of the molding block 23 to push against the slider 21.

Referring to Figures 3 and 4, the cooling water system 3 can be supplied with a coolant to cool the first mold 1 and the second mold 2, particularly for the first mold 1 and the second mold 2 for contact. The part of the metal plate. Taking the rotating block 111 of the first die 1 as an example, since the rotating block 111 has to be rotated by a predetermined angle during the pressing of the first die 1 toward the second die 2, the opposite surfaces of the rotating block 111 An arc-shaped long groove 115 is disposed adjacent to the forming end 111b, and each of the long grooves 115 communicates with a cooling passage 116 inside the rotating block 111, and a sealing gasket 117 is disposed on an outer edge of each of the long grooves 115. Close to the adjacent members. The cooling water system 3 is provided with a water inlet passage 31 communicating with one of the long slots 115, and another water outlet passage 32 for communicating with the other long slot 115. Accordingly, when the rotating block 111 rotates, the two long slots 115 have sufficient space. Relative to the water inlet passage 31 and the water outlet passage 32, the rotation block 111 does not squeeze or impact the water inlet passage 31 and the water outlet passage 32 when rotating, and the water inlet passage 31 and the water outlet passage can be maintained. 32 smoothly directs the coolant into and out of the cooling passage 116. Similarly, the slider 21 and the top block 24 which are moved in the second die 2 are similarly constructed, and will not be described in detail here.

According to the foregoing configuration, the present invention can implement a hot stamping forming method having a negative-angle structural member, comprising the steps of: referring to FIG. 5, placing a metal sheet member W heated to an austenitic state into the aforementioned hot stamping. In the forming mold, at this time, the two ends of the metal plate member W can respectively abut against the slider 21 and the molding block 23, and the clamping surface 241 of the top block 24 can be aligned with the metal plate member. The part between the two ends of W.

Referring to FIG. 6, the first die 1 and the second die 2 for driving the hot stamping die are relatively close to each other, and in the process of being relatively close, the pressing block 113 provided on the pushing end 111a of the rotating block 111 is pressed. When the inclined surface 212 of the slider 21 of the second die 2 is connected, the rotating block 111 starts to rotate clockwise along the supporting edge 122 of the forming punch 12, and is pressed against the elastic resisting member 112 to be elastically deformed. On the other hand, before the rotating block 111 of the rotating assembly 11 starts to rotate, the clamping surface 121 of the forming punch 12 of the first die 1 can be first with the clamping surface 241 of the top block 24 of the second die 2. The metal plate member W is firmly clamped together, and the top block 24 is gradually retracted toward the molding groove 231 of the molding block 23 as the first die 1 and the second die 2 are relatively close to each other.

Referring to FIG. 7, the rotating block 111 continues to rotate as the first die 1 and the second die 2 are relatively close, until the forming surface 114 of the forming end 111b of the rotating block 111 of the rotating component 11 and the slider are After the pressing faces 211 of the 21 are parallel, the first die 1 and the second die 2 that are relatively close to each other will no longer rotate the rotating block 111, but will be offset by the rotating block 111 against the end 111a. The pressing block 113 is attached to the inclined surface 212 of the slider 21 in parallel to push the slider 21 to slide toward the molding block 23, and causes the elastic returning member 22 to elastically deform. After the rotating block 111 stops rotating, the end of the forming end 111b of the rotating block 111 can be substantially flush with the end of the supporting edge 122 of the forming punch 12, and maintained until the first die 1 and the second die 2 are relatively close. The dead point is still the same.

Referring to Figures 8 and 9, during the sliding of the slider 21 toward the molding block 23, the convex end of the slider 21 can be pushed toward the pocket R of the rotating block 111 to be slipped by the slider. Block 21 will One end of the metal plate member W is squeezed between the forming surface 114 of the rotating block 111 and the pressing surface 211 of the slider 21, and when the first die 1 and the second die 2 are relatively close to the dead center position. One end of the metal plate member W can be formed with a negative angle structure N (indicated in Fig. 9). The sheet metal W is continuously pressed by the first mold 1, and the metal sheet member W is heat-exchanged with a cooling water system 3 in the hot stamping forming mold to rapidly cool down, thereby obtaining a negative-angle structural member W'. Finally, the mold is removed to take out the negative-angle structural member W'.

It is worth mentioning that, in the hot stamping forming method with the negative-angle structural component of the present invention, the second die 2 can be controlled to move to move the first die 1 toward or away from the second die 2, or Controlling the first die 1 to move the second die 2 toward or away from the first die 1, or the first die 1 and the second die 2 are both moved relatively close to or away from each other. In addition, when one of the first die 1 and the second die 2 is an upper die, the other is a lower die, which is understood by those having ordinary knowledge in the art, so the present invention does not adopt the embodiment. The relative position of the drawing indicates that the first mode 1 is necessarily an upper mold.

In summary, the hot stamping forming method and the mold of the negative-angle structural component of the present invention can be formed into a component having a negative-angle structure by a hot stamping process, which not only has good process efficiency, but also can be obtained. The components have ultra-high strength, dimensional accuracy and good stability, which is a breakthrough in forming parts with negative-angle structural components.

While the invention has been described in connection with the preferred embodiments described above, it is not intended to limit the scope of the invention. The technical scope of the invention is protected, and therefore the scope of the invention is defined by the scope of the appended claims.

1‧‧‧ first model

11‧‧‧Rotating components

111‧‧‧Rotating block

111a‧‧‧Pushing end

111b‧‧‧ formed end

112‧‧‧Flexible parts

113‧‧‧Resistance block

114‧‧‧Forming surface

116‧‧‧Cooling channel

12‧‧‧ Forming punch

121‧‧‧ clamping surface

122‧‧‧Support edge

2‧‧‧ second mode

21‧‧‧ Slider

211‧‧‧

212‧‧‧Bevel

22‧‧‧Elastic reset parts

23‧‧‧plastic block

231‧‧‧plastic trough

24‧‧‧ top block

241‧‧‧ clamping surface

3‧‧‧Cooling waterway system

R‧‧‧ recess

Claims (5)

A hot stamping forming die with a negative-angle structural component, comprising: a first die, the first die is provided with a rotating component, the rotating component has a rotating block and an elastic abutting member, the rotating block has a pushing end and a forming end, the forming end is provided with a forming surface, the elastic abutting member abuts the rotating block, and the opposite surfaces of the rotating block are respectively provided with an arc-shaped long groove adjacent to the forming end, and the long groove and the long groove are respectively a cooling passage is connected to the inside of the rotating block, and a sealing gasket is disposed on an outer edge of each of the long grooves; a second die, the second die has a slider, and the slider is provided with a pressing surface, the first die and the first When the second mold is relatively close to the dead point position, a forming angle of the negative angle forming cavity is formed between the forming surface of the rotating block and the pressing surface of the sliding block; and a cooling waterway system for cooling the first mold and the first In the second mode, the cooling waterway system is provided with a water inlet passage communicating with one of the long slots of the rotating block, and another water outlet passage connecting the other long slot of the rotating block. A hot stamping forming die having a negative-angle structural component according to claim 1, wherein the first die is provided with a forming punch, and the second die is provided with a molding block, the forming punch being closest to the The portion of the second mold forms a clamping surface, and the second mold is provided with a retractable top block in the molding block, the top block having a clamping surface opposite to the clamping surface of the forming punch. The hot stamping forming die with a negative-angle structural component according to claim 2, wherein the sliding block is adjacent to the molding block, and an elastic returning member is connected and positioned on the sidewall of the molding block and abuts The slider. The hot stamping forming die with a negative-angle structural component according to claim 2, wherein the rotating block rotates along a supporting edge of the forming punch, and the first die is relatively close to the second die. At the dead center position, the end of the forming end of the rotating block is flush with the end of the supporting edge of the forming punch. a hot stamping forming die having a negative-angle structural component as described in claim 1 of the patent scope, The pushing end of the rotating block is provided with a pressing block for attaching a slope of the slider.