A sheet metal positioning pin mechanism ejection device in hot stamping production

Abstract

The utility model discloses a sheet metal positioning pin mechanism ejection stripping device in hot stamping production, comprising: a bottom plate; a positioning pin mechanism, which is arranged on the bottom plate and has a positioning column at its upper end; a mold insert, which has a through hole in the middle; the upper part of the positioning pin mechanism passes through the through hole; a stripping mechanism, which is sleeved on the outer surface of the positioning pin mechanism and has an upper part passing through the through hole, and the upper end surface of the stripping mechanism is provided with a mating surface matching the mold insert; an elastic force storage device, which is arranged on the bottom plate and located on the outer side of the positioning pin mechanism, and the telescopic end is against the lower part of the stripping structure; when the elastic force storage device is not charged, the top end of the stripping mechanism exceeds the through hole, and the top of the positioning pin mechanism is exposed. The utility model can be smoothly separated from the positioning pin mechanism after the sheet metal stamping is completed, so as to avoid the positioning pin mechanism being pulled off and the formed sheet metal being deformed.

Description

Technical Field

[0001] The utility model relates to the field of hot stamping dies, in particular to a sheet metal positioning pin mechanism ejection stripping device in hot stamping forming production. Background Art

[0002] Hot stamping is the process of heating steel sheet blanks until they are ductile and then stamping them. When the high-temperature blank is taken out of the heating furnace by the clamping device and placed in the corresponding mold cavity position, it falls into the mold cavity surface after being accurately positioned and guided by the locating pin mechanism installed on the mold, so that the heated blank can fall into the mold cavity quickly and accurately. Since the sheet metal locating pin mechanism is used for hot stamping automotive parts, if the surface position where the locating pin mechanism is located has large ups and downs, then after the sheet metal is formed, the material is easy to hold the locating pin mechanism tightly, so that the product cannot be smoothly disengaged from the locating pin mechanism after the mold is opened, resulting in deformation of the parts and the locating pin mechanism being pulled off. If the production cycle is too fast and the broken locating pin mechanism on the mold is not discovered in time during the next stamping, it will cause a greater safety accident, and the mold will be damaged or the broken locating pin mechanism will fly out to injure the operator and other on-site equipment, causing immeasurable economic losses. Utility Model Content

[0003] In view of the above-mentioned defects of the prior art, the purpose of the utility model is to provide a spring-pushing and stripping device for a sheet metal locating pin mechanism in hot stamping production, which can be smoothly separated from the locating pin mechanism after the sheet metal stamping is completed, thereby avoiding the locating pin mechanism from being pulled off and the formed sheet metal from being deformed.

[0004] The purpose of the utility model is achieved through such technical solution:

[0005] A sheet metal positioning pin mechanism ejection device in hot stamping production, comprising:

[0006] Base plate;

[0007] A positioning pin mechanism is arranged on the bottom plate, and a positioning column is arranged on the upper end thereof;

[0008] The mold insert has a through hole in the middle; the upper part of the positioning pin mechanism passes through the through hole;

[0009] A stripping mechanism, which is sleeved on the outer surface of the positioning pin mechanism and has an upper portion passing through a through hole, wherein the upper end surface of the stripping mechanism is provided with a mating surface matching the mold insert;

[0010] The elastic force storage device is arranged on the bottom plate and is located outside the positioning pin mechanism, and the telescopic end is against the lower part of the stripping structure; when the elastic force storage device does not store force, the top of the stripping mechanism exceeds the through hole and the top of the positioning pin mechanism is exposed.

[0011] Furthermore, the positioning pin mechanism comprises:

[0012] The base is fixed on the bottom plate, and the upper end surface is provided with a concave accommodating groove; the axis of the accommodating groove is parallel to the force storage release direction of the elastic force storage device;

[0013] The pin rod has its lower end inserted on the base, and the outer wall of the pin rod is seamlessly fitted with the inner wall of the accommodating groove; the pin rod is radially limited by the accommodating groove; the pin rod is sleeved in the through hole and is covered by the stripping mechanism;

[0014] The positioning column is arranged on the top of the pin rod and is coaxial with the pin rod; the positioning column is located above the mold insert.

[0015] Furthermore, the lower surface of the base is provided with a stepped mounting hole connected to the accommodating groove; the axis of the stepped mounting hole is colinear with the axis of the accommodating groove; the bottom of the pin rod is provided with a threaded hole with an internal thread facing the stepped mounting hole; the pin rod is fixed to the base by screws.

[0016] Furthermore, the positioning column includes a stop section, a limiting section, and a guide section from bottom to top; the stop section is in a truncated cone shape, and the diameter of the lower base is the same as the diameter of the pin rod; the lower base of the stop section is flush with the mating surface of the mold insert; the limiting section is cylindrical, and the diameter is the same as the upper base diameter of the stop section; the guide section is conical, and the bottom diameter is the same as the diameter of the limiting section; the tip of the guide section is rounded.

[0017] Furthermore, there are two elastic force storage devices, which are located on both sides of the positioning pin mechanism;

[0018] The stripping mechanism comprises:

[0019] A connecting seat, the lower surface of which is connected to the telescopic ends of the two elastic force storage devices;

[0020] A stripping tube has an inner sleeve with a positioning pin mechanism and an outer sleeve in the through hole. The upper end surface of the stripping tube is provided with a mating surface matching the mold insert; a through hole is provided in the connecting seat and the stripping tube for the pin to pass through.

[0021] Furthermore, the stripping pipe comprises:

[0022] A bottom pipe, arranged on the connecting seat;

[0023] The upper tube is arranged on the bottom tube; the cross section of the upper tube is smaller than that of the bottom tube; the projection of the upper tube along its axis is located on the bottom tube; the perforations of the mold insert are stepped holes matching the outer surfaces of the bottom tube and the upper tube.

[0024] Furthermore, a gap is left between the outer surface of the upper tube and the through hole; the bottom tube is in contact with the inner wall of the through hole;

[0025] The projection of the upper tube along its axis is located inside the bottom tube; the outer surface of the upper tube forms a step shape with the upper surface and the outer surface of the bottom tube.

[0026] Furthermore, the bottom tube is cylindrical; a guide sleeve is disposed on the outer shell of the bottom tube; and the outer surface of the guide sleeve is fixed in the through hole by interference fit with the through hole.

[0027] Furthermore, when the lower surface of the connecting seat is in contact with the upper surface of the bottom, the upper end surface of the stripping tube is flush with the matching mating surface of the mold insert.

[0028] Furthermore, the elastic force storage device is a nitrogen spring.

[0029] Due to the adoption of the above technical solution, the utility model has the following advantages:

[0030] During the sheet stamping process, the sheet presses down on the stripping mechanism, causing the elastic force storage device to store force, while the upper end of the stripping mechanism completes the sheet stamping modeling. After the modeling is completed and the mold is separated, the elastic force storage device moves up along the positioning pin mechanism to eject the sheet to prevent the sheet from being directly stuck with the positioning pin. During the entire process, no external equipment is used, and force storage and material discharge are automatically realized, while the positioning of the positioning pin and the sheet stamping modeling are not affected.

[0031] Other advantages, objectives and features of the present invention will be described in the following description to some extent, and will be apparent to those skilled in the art based on the following examination and study, or may be taught from the practice of the present invention to some extent. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] The accompanying drawings of the present utility model are as follows:

[0033] Figure 1 It is a front view structural schematic diagram of the sheet metal positioning pin mechanism spring-pushing and stripping device in the hot stamping production in the embodiment during the stamping process.

[0034] Figure 2 for Figure 1 Schematic diagram of the top view structure.

[0035] Figure 3 for Figure 2 Schematic diagram of the visual structure at the AA section.

[0036] Figure 4 for Figure 3 Enlarged structural diagram at B in the middle.

[0037] Figure 5 for Figure 3 Enlarged structural diagram at point C in the middle.

[0038] Figure 6 for Figure 3Enlarged structural diagram at D in the middle.

[0039] Figure 7 It is a schematic diagram of the three-dimensional structure of the sheet metal positioning pin mechanism in the hot stamping production during the stamping process of the ejection device in the embodiment.

[0040] In the figure: 1. bottom plate; 21. base; 211. accommodating groove; 212. stepped mounting hole; 22. pin rod; 221. threaded hole; 23. positioning column; 231. stop section; 232. limiting section; 233. guide section; 3. mold insert; 31. perforation; 41. connecting seat; 421. bottom tube; 422. upper tube; 43. through hole; 44. guide sleeve; 5. elastic force storage device. DETAILED DESCRIPTION

[0041] The utility model is further described below in conjunction with the accompanying drawings and embodiments. Example

[0042] like Figures 1 to 7 As shown, a sheet metal positioning pin mechanism ejection device in hot stamping production includes:

[0043] Bottom plate 1;

[0044] A positioning pin mechanism is arranged on the bottom plate 1, and a positioning column 23 is provided at the upper end thereof;

[0045] The mold insert 3 has a through hole 31 in the middle; the upper part of the positioning pin mechanism passes through the through hole 31;

[0046] The stripping mechanism is sleeved on the outer surface of the positioning pin mechanism, and the upper part thereof passes through the through hole 31. The upper end surface of the stripping mechanism is provided with a mating surface matching the mold insert 3;

[0047] The elastic force storage device 5 is arranged on the bottom plate 1, located outside the positioning pin mechanism, and the telescopic end is against the lower part of the stripping structure; when the elastic force storage device 5 is not storing force, the top of the stripping mechanism exceeds the through hole 31, and the top of the positioning pin mechanism is exposed.

[0048] In this embodiment, the positioning pin mechanism includes:

[0049] The base 21 is fixed on the bottom plate 1, and an upper end surface is provided with a concave accommodating groove 211; the axis of the accommodating groove 211 is parallel to the force storage release direction of the elastic force storage device 5;

[0050] The lower end of the pin rod 22 is inserted on the base 21, and the outer wall of the pin rod 22 is seamlessly fitted with the inner wall of the accommodating groove 211; the pin rod 22 is radially limited by the accommodating groove 211; the pin rod 22 is sleeved in the through hole 31 and is covered by the stripping mechanism;

[0051] The positioning column 23 is arranged on the top of the pin rod 22 and is coaxial with the pin rod 22 ; the positioning column 23 is located above the mold insert 3 .

[0052] The pin rod 22 and the positioning column 23 are integrally formed, so that the device can be matched with different mold inserts 3 by replacing the pin rod 22, and has a wider range of applications.

[0053] In this embodiment, the lower surface of the base 21 is provided with a stepped mounting hole 212 connected to the accommodating groove 211; the axis of the stepped mounting hole 212 is colinear with the axis of the accommodating groove 211; the bottom of the pin rod 22 is provided with a threaded hole 221 with an internal thread facing the stepped mounting hole 212; the pin rod 22 is fixed to the base 21 by screws.

[0054] The pin rod 22 is connected to the base 21 by screws, so that the positioning column 23 can be easily replaced and maintained.

[0055] In this embodiment, the positioning column 23 includes a stop section 231, a limiting section 232, and a guide section 233 from bottom to top; the stop section 231 is a truncated cone, and the diameter of the lower base is the same as the diameter of the pin 22; the lower base of the stop section 231 is flush with the mating surface of the mold insert 3; the limiting section 232 is cylindrical, and the diameter is the same as the upper base diameter of the stop section 231; the guide section 233 is conical, and the bottom diameter is the same as the diameter of the limiting section 232; the tip of the guide section 233 is chamfered.

[0056] The guide section 233 facilitates positioning, the limiting section 232 can effectively limit the material plate, and the stop section 231 adopts an expanded diameter structure to limit the height of the material plate. At the same time, during the stamping process, no gap will appear between the material plate and the positioning column 23, resulting in deviation in the stamping size.

[0057] In this embodiment, there are two elastic force storage devices 5, which are located on both sides of the positioning pin mechanism;

[0058] The stripping mechanism comprises:

[0059] A connecting seat 41, the lower surface of which is connected to the telescopic ends of the two elastic force storage devices 5;

[0060] The stripping tube has a positioning pin mechanism inside and an outer sleeve inside the through hole 31. The upper end face of the stripping tube is provided with a mating surface matching the mold insert 3. The connecting seat 41 and the stripping tube are provided with a through hole 43 for the pin to pass through.

[0061] The two elastic force storage devices 5 enable the stripping tube to exert greater pressure on the material plate during the stripping process, and to maintain the stripping tube vertically upward in a relatively more stable manner.

[0062] In this embodiment, the stripping tube includes:

[0063] A bottom tube 421 is disposed on the connecting seat 41;

[0064] The upper tube 422 is arranged on the bottom tube 421; the cross section of the upper tube 422 is smaller than that of the bottom tube 421; the projection of the upper tube 422 along its axis is located on the bottom tube 421; the through hole 31 of the mold insert 3 is a stepped hole matching the outer surfaces of the bottom tube 421 and the upper tube 422.

[0065] The design of the bottom tube 421 and the upper tube 422 allows the bottom tube 421 and the perforation 31 to form an upward displacement limiting structure, thereby preventing the upper tube 422 from overshooting and causing impact deformation damage to the surface of the formed sheet.

[0066] In this embodiment, a gap is left between the outer surface of the upper tube 422 and the through hole 31; the bottom tube 421 is in contact with the inner wall of the through hole 31;

[0067] The projection of the upper tube 422 along its axis is located inside the bottom tube 421 ; the outer surface of the upper tube 422 forms a step shape with the upper surface and outer surface of the bottom tube 421 .

[0068] A gap is left between the upper tube 422 and the through hole 31, which can reduce the resistance of the upper tube 422 to expand and contract in the through hole 31. By setting the projection of the upper tube 422 along its axis to be located inside the bottom tube 421, the outer circle of the bottom tube 421 forms an interference surface with the through hole 31, so that the bottom tube 421 is uniformly stressed upward with the through hole 31 under the action of the elastic force storage device 5, and the bottom tube 421 will not be eccentrically stressed, resulting in eccentric bending of the bottom tube 421, thereby affecting the verticality of the upper tube 422.

[0069] In this embodiment, the bottom tube 421 is cylindrical; a guide sleeve 44 is disposed on the outer surface of the bottom tube 421 ; the outer surface of the guide sleeve 44 is interference fit with the through hole 31 and is fixed in the through hole 31 .

[0070] The guide sleeve 44 can reduce the sliding resistance and effectively limit the lifting and lowering of the upper tube 422 to ensure its verticality.

[0071] In this embodiment, when the lower surface of the connecting seat 41 is in contact with the upper surface of the bottom, the upper end surface of the stripping tube is flush with the matching mating surface of the mold insert 3 .

[0072] Such a design can prevent the upper surface of the upper tube 422 from dropping due to stress during stamping, which would result in an unqualified forming surface of the sheet near the positioning pin hole.

[0073] The elastic force storage device 5 is a nitrogen spring.

[0074] The sheet metal positioning pin mechanism ejection device in the hot stamping production of this embodiment is used as follows: according to the needs of the mold, a perforation 31 is set in the corresponding mold insert 3, and the mold insert is sheathed in a stripping tube.

[0075] When the mold is opened, the upper tube 422 moves up along the pin rod 22 under the action of the nitrogen spring, but the upper part of the limiting section 232 is kept exposed. After the material plate is placed in the mold, it forms a limit with the limiting section 232 and is fixed.

[0076] During hot stamping, the material sheets are pressed by the dies, so that their surfaces press against the upper end surface of the upper tube 422, forcing the upper tube 422 to move downward, so that the nitrogen spring is compressed and stores force until the upper end surface of the upper tube 422 is flush with the die surface of the die insert 3.

[0077] After the stamping is completed, the mold is opened, and the material plate is no longer squeezed by the mold, but its positioning hole is clamped with the limiting section 232 and the stop section 231. At this time, the nitrogen spring pushes the bottom tube 421 upward, forcing the upper tube 422 to push the formed material plate upward along the pin rod 22, completing the separation of the material plate and the positioning pin mechanism.

[0078] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model rather than to limit it. Although the utility model has been described in detail with reference to the preferred embodiments, ordinary technicians in the field should understand that the technical solution of the utility model can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution, which should be included in the scope of the claims of the utility model.

Claims

1. A sheet metal positioning pin mechanism ejection device in hot stamping production, characterized in that: include: Base plate; A positioning pin mechanism is arranged on the bottom plate, and a positioning column is arranged on the upper end thereof; The mold insert has a through hole in the middle; the upper part of the positioning pin mechanism passes through the through hole; A stripping mechanism, which is sleeved on the outer surface of the positioning pin mechanism and has an upper portion passing through a through hole, wherein the upper end surface of the stripping mechanism is provided with a mating surface matching the mold insert; The elastic force storage device is arranged on the bottom plate and is located outside the positioning pin mechanism, and the telescopic end is against the lower part of the stripping structure; when the elastic force storage device does not store force, the top of the stripping mechanism exceeds the through hole and the top of the positioning pin mechanism is exposed.

2. The sheet metal positioning pin mechanism ejection device in hot stamping production according to claim 1, characterized in that: The positioning pin mechanism comprises: The base is fixed on the bottom plate, and the upper end surface is provided with a concave accommodating groove; the axis of the accommodating groove is parallel to the force storage release direction of the elastic force storage device; The pin rod has its lower end inserted on the base, and the outer wall of the pin rod is seamlessly fitted with the inner wall of the accommodating groove; the pin rod is radially limited by the accommodating groove; the pin rod is sleeved in the through hole and is covered by the stripping mechanism; The positioning column is arranged on the top of the pin rod and is coaxial with the pin rod; the positioning column is located above the mold insert.

3. The sheet metal positioning pin mechanism ejection device in hot stamping production according to claim 2, characterized in that: The lower surface of the base is provided with a stepped mounting hole connected to the accommodating groove; the axis of the stepped mounting hole is colinear with the axis of the accommodating groove; the bottom of the pin rod is provided with a threaded hole with an internal thread facing the stepped mounting hole; the pin rod is fixed to the base by screws.

4. The sheet metal positioning pin mechanism ejection device in hot stamping production according to claim 2, characterized in that: The positioning column includes a stop section, a limiting section, and a guide section from bottom to top; the stop section is in a truncated cone shape, and the diameter of the lower base is the same as the diameter of the pin rod; the lower base of the stop section is flush with the mating surface of the mold insert; the limiting section is cylindrical, and the diameter is the same as the diameter of the upper base of the stop section; the guide section is conical, and the bottom diameter is the same as the diameter of the limiting section; the tip of the guide section is rounded.

5. The sheet metal positioning pin mechanism ejection device in hot stamping production according to claim 2, characterized in that: There are two elastic force storage devices, which are located on both sides of the positioning pin mechanism; The stripping mechanism comprises: A connecting seat, the lower surface of which is connected to the telescopic ends of the two elastic force storage devices; A stripping tube has an inner sleeve with a positioning pin mechanism and an outer sleeve in the through hole. The upper end surface of the stripping tube is provided with a mating surface matching the mold insert; a through hole is provided in the connecting seat and the stripping tube for the pin to pass through.

6. The sheet metal positioning pin mechanism ejection device in hot stamping production according to claim 5, characterized in that: The stripping tube comprises: A bottom pipe is arranged on the connecting seat; The upper tube is arranged on the bottom tube; the cross section of the upper tube is smaller than that of the bottom tube; the projection of the upper tube along its axis is located on the bottom tube; the perforations of the mold insert are stepped holes matching the outer surfaces of the bottom tube and the upper tube.

7. The sheet metal positioning pin mechanism ejection device in hot stamping production according to claim 6, characterized in that: A gap is left between the outer surface of the upper tube and the perforation; the bottom tube fits the inner wall of the perforation; The projection of the upper tube along its axis is located inside the bottom tube; the outer surface of the upper tube forms a step shape with the upper surface and the outer surface of the bottom tube.

8. The sheet metal positioning pin mechanism ejection device in hot stamping production according to claim 7, characterized in that: The bottom tube is cylindrical; a guide sleeve is disposed on the outer surface of the bottom tube; the outer surface of the guide sleeve is interference-fitted with the perforation and fixed in the perforation.

9. The sheet metal positioning pin mechanism ejection device in hot stamping production according to claim 5, characterized in that: When the lower surface of the connecting seat is in contact with the upper surface of the bottom, the upper end surface of the stripping tube is flush with the matching die surface of the mold insert.

10. The sheet metal positioning pin mechanism ejection device in hot stamping production according to any one of claims 1 to 9, characterized in that: The elastic force storage device is a nitrogen spring.

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