Automobile fuel filler inner side punch die

Abstract

The present application relates to a kind of automobile filler inner side die, for processing automobile filler from first intermediate body into second intermediate body, including core-pulling punch tear unit, embrace and clamping translation unit, upper die and lower die, core-pulling punch tear unit includes profiled seat block being arranged on lower die and side punch core rod being inserted in the upper portion of profiled seat block, side punch core rod includes the second front profiled camber surface matched with the inner surface of the front portion of thin mouth, the second rear profiled camber surface matched with the inner surface of the rear portion of thin mouth and the tear part being arranged in the middle of second front profiled camber surface;Embrace and clamping translation unit is used to embrace first intermediate body and make it be translated backwards relative to core-pulling punch tear unit.This automobile filler inner side die will be the relative motion of punch to workpiece when side punching by fixed punch, and it is realized by workpiece itself translation, punch does not need to set translation mechanism, can be placed in the limited space of workpiece, and there is sufficient space outside workpiece to set translation mechanism, so that the air vent and the upturned portion on automobile filler are obtained.

Description

Technical Field

[0001] This invention relates to the field of stamping technology, and in particular to a stamping die for the inner side of an automobile fuel filler neck. Background Technology

[0002] Metal stamping is a common process in the processing of many metal products. With the diversification of customer needs, mold design must also meet the requirements of various products.

[0003] Figure 1 The image shows a car fuel filler neck 100 with a gradually tapering flared structure. The wider end 101 is used to insert the fuel nozzle, while the narrower end 102 faces the fuel tank. To prevent internal pressure from hindering gasoline delivery, a vent 103 is provided on one side of the narrower end 102. This vent 103 is created by punching outwards a portion of the narrower end 102's wall. This punching creates a protruding portion 104 that curves outwards from the narrower end 102 at the break point. Because it cannot interfere with the insertion of the fuel nozzle into the narrower end 102, this protruding portion 104 cannot extend into the interior of the narrower end 102. The forming of this vent 103 is a challenge. The internal space of the car fuel filler neck 100 is limited, and conventional side-punching dies require a considerable horizontal length for extension and retraction. Following conventional design principles, the side-punching die would also need to be housed within a core-pulling structure, which is extremely difficult to implement.

[0004] Chinese patent CN221694802U discloses a side-punch snap-fit ​​mold for an automotive fuel filler neck cup. This mold uses a stamping plate and a parts placement rack to fix the blank of the automotive fuel filler neck, and then forms its cup-shaped structure through side punching. Here, the forming is aimed at the overall shape of the automotive fuel filler neck, rather than processing the vent. Even combined with a conventional external side punch structure, it is impossible for the resulting vent to have an outwardly protruding part 104 around it.

[0005] Therefore, it is necessary to design a special mold to solve the above problems. Summary of the Invention

[0006] The main objective of this invention is to provide an inner punching die for an automobile fuel filler neck, which can form a vent and a raised portion on the narrow opening of the automobile fuel filler neck.

[0007] The present invention achieves the above-mentioned objective through the following technical solution: an inner punching die for an automobile fuel filler neck, used to process an automobile fuel filler neck from a first intermediate body into a second intermediate body, the first intermediate body including an integrally formed coarse opening and a fine opening, the second intermediate body including a vent located on the fine opening and a raised portion turned outward on one side of the vent; the inner punching die for the automobile fuel filler neck includes a core-pulling and tearing unit, a clamping and translating unit, an upper die and a lower die;

[0008] The core-pulling and tearing unit includes a contour block disposed on the lower die and a side core-punching bar inserted into the upper part of the contour block. The contour block includes a first front contour arc surface that matches the front inner surface of the coarse opening and a first rear contour arc surface that matches the rear inner surface of the coarse opening. The side core-punching bar includes a second front contour arc surface that matches the front inner surface of the narrow opening, a second rear contour arc surface that matches the rear inner surface of the narrow opening, and a tearing part disposed in the middle of the second front contour arc surface.

[0009] The clamping and translating unit is used to clamp the first intermediate body and make it translate backward relative to the core-pulling and tearing unit, so that the tearing part tears the front side wall of the narrow opening to obtain the vent and the raised part.

[0010] Specifically, the inner punching die for the car fuel filler neck also includes an upper die comprising an upper template and an upper ejector plate that floats elastically below the upper template, and a lower die comprising a lower template and a lower ejector plate that floats elastically above the lower template.

[0011] Furthermore, the contour block is fixed to the lower template, and the contour block and the side punch mandrel pass through the lower ejector plate.

[0012] Furthermore, the core-pulling and tearing unit also includes an upper limit block, which is fixed to the lower part of the upper template. The upper limit block has at least one cushion surface that matches the upper part of the second rear contoured arc surface.

[0013] Furthermore, the clamping translation unit includes a front clamping assembly and a rear clamping assembly, which are respectively disposed on the front and rear sides of the core-pulling and punching unit. The front clamping assembly includes a front clamping slider located in front of the contouring block, a front reset elastic member that provides forward elastic force to the front clamping slider, and a first side stamping block that drives the front clamping slider to move backward. The rear clamping assembly includes a rear clamping slider located behind the contouring block, a rear reset elastic member that provides forward elastic force to the rear clamping slider, and a second side stamping block that drives the rear clamping slider to move forward.

[0014] Furthermore, the front clamping slider is embedded with a clearance insert located at the opposite position of the punching part.

[0015] Furthermore, the front clamping slider and the front reset elastic element are disposed on the upper release plate, and the first side stamping block is fixed on the upper template and can pass through the upper release plate; the rear clamping slider and the rear reset elastic element are disposed on the lower release plate, and the second side stamping block is fixed on the upper template and passes through the upper release plate.

[0016] Furthermore, the bottom of the first intermediate body has a skirt, and each of the left and right sides of the skirt is provided with an angle limiting notch. The clamping translation unit also includes a pair of angle limiting components located on the left and right sides of the core pulling and punching unit, respectively. The angle limiting component includes a protruding slider that is inserted into the angle limiting notch and a side reset elastic member that provides forward elastic force to the protruding slider.

[0017] Furthermore, the front reset elastic element is a pair of gas springs respectively disposed on the left and right sides of the core-pulling and tearing unit.

[0018] The beneficial effects of the technical solution of this invention are:

[0019] This automotive fuel filler neck inner punch die achieves the relative movement of the punch to the workpiece during side punching by fixing the punch stationary while the workpiece itself translates. The punch does not need to be equipped with a translation mechanism and can be placed within the limited space of the workpiece, while there is sufficient space outside the workpiece to set up a translation mechanism, thereby obtaining the vent and raised part on the automotive fuel filler neck. Attached Figure Description

[0020] Figure 1 A 3D diagram of a car's fuel filler neck;

[0021] Figure 2 A diagram showing the positional relationship between the inner punch die of the car fuel filler neck and the first intermediate body in the mold-open state;

[0022] Figure 3 This is an axial sectional view of the inner punching die and the first intermediate body of the car fuel filler neck in the mold-open state.

[0023] Figure 4 This is an axial sectional view of the inner punch die and the second intermediate body of the car fuel filler neck in the mold-closed state.

[0024] Figure 5 A diagram showing the positional relationship between the core component of the inner punch die of the car fuel filler neck and the second intermediate body in the mold-closed state;

[0025] Figure 6 This is a 3D view of the core-pulling and tearing unit in the mold-closed state;

[0026] Figure 7 This is a diagram showing the positional relationship between the side punch and the second intermediate body in the mold-closed state.

[0027] Figure 8 A 3D view of the front clamping component;

[0028] Figure 9 A 3D view of the rear-hugging component;

[0029] Figure 10 A 3D view of two angle limiting components.

[0030] The diagram is marked as follows:

[0031] 100-Car fuel filler neck, 100a-First intermediate body, 100b-Second intermediate body, 101-Wide opening, 102-Narrow opening, 103-Ventilation port, 104-Raised part, 105-Skirt, 106-Angle limiting notch;

[0032] 200 - Inner punch die for car fuel filler neck

[0033] 1-Core pulling and punching unit, 11-Contouring seat block, 111-First front contouring arc surface, 112-First rear contouring arc surface, 12-Side punching rod, 121-Second front contouring arc surface, 122-Second rear contouring arc surface, 123-Punching part, 13-Upper limit block, 131-Backrest surface;

[0034] 2-Clamping translation unit, 21-Front clamping assembly, 211-Front clamping slider, 212-Front reset elastic element, 213-First side stamping block, 214-Avoiding insert, 22-Rear clamping assembly, 221-Rear clamping slider, 222-Rear reset elastic element, 223-Second side stamping block, 23-Angle limiting assembly, 231-Protruding slider, 232-Side reset elastic element;

[0035] 3-Upper mold, 31-Upper template, 32-Upper release plate;

[0036] 4-Lower mold, 41-Lower template, 42-Lower ejector plate. Detailed Implementation

[0037] The present invention will be further described in detail below with reference to specific embodiments.

[0038] Example:

[0039] like Figure 1 As shown, the car filler neck 100 includes an integrally formed wide neck 101 and a narrow neck 102. The narrow neck 102 is provided with a vent 103 and a raised portion 104 that is turned outward on one side of the vent 103.

[0040] The raised part 104 is formed by tearing the material at the original position of the vent 103 and turning it outward. During the processing, the workpiece (a general term for the intermediate parts of each step) passes through each station with the coarse opening 101 at the bottom and the fine opening 102 at the top.

[0041] like Figures 2 to 5 As shown, an inner punching die 200 for a car fuel filler neck is used to form the vent 103 and the raised part 104 on the car fuel filler neck 100. It includes a core-pulling punching and tearing unit 1, a clamping and translating unit 2, an upper die 3, and a lower die 4.

[0042] The forming of the car fuel filler neck 100 involves processes such as stretching, pre-trimming, top trimming, top edge outward turning (to obtain the first intermediate body 100a), punching and tearing at the narrow opening 102 (to obtain the second intermediate body 100b), trimming, and curling. The first intermediate body 100a already has the structure of the coarse opening 101 and the narrow opening 102. Compared with the first intermediate body 100a, the second intermediate body 100b has an additional vent 103 and a raised portion 104 on the narrow opening 102. Moreover, in the pre-trimming step, a skirt 105 is left at the bottom of the first intermediate body 100a, and an angle limiting notch 106 is left on each of the left and right sides of the skirt 105. The angle limiting notch 106 is used to position the workpiece at an angle between the top trimming step and the trimming step. The processing performed by the inner stamping die 200 of the car fuel filler neck is to transform the first intermediate body 100a into the second intermediate body 100b.

[0043] The design concept of the inner punch die 200 for the automotive fuel filler neck is to fix the relative movement of the punch to the workpiece during side punching by fixing the punch (i.e., the side punch core 12 with the tearing part 123) while the workpiece itself moves. This eliminates the need for a translation mechanism for the punch, allowing it to be placed within the limited space of the workpiece, while providing ample space outside the workpiece for such a mechanism. Therefore, the clamping and translation unit 2 clamps the outer wall of the first intermediate body 100a and moves it backward relative to the core-pulling and tearing unit 1. The core-pulling and tearing unit 1 serves two purposes: firstly, it limits the inner side of the first intermediate body 100a; secondly, it uses the tearing part 123 to partially tear the front side wall of the narrow opening 102, thus obtaining the vent 103 and the raised part 104. The terms "front" and "back" and "left" represent two relative directions with a vertical relationship within the horizontal plane.

[0044] like Figure 2 and Figure 3 As shown, the upper mold 3 includes an upper template 31 and an upper ejector plate 32 that floats elastically below the upper template 31, and the lower mold 4 includes a lower template 41 and a lower ejector plate 42 that floats elastically above the lower template 41.

[0045] During the mold closing process, the upper ejector plate 32 and the lower ejector plate 42 will contact each other first. At this time, the clamping and translation unit 2 surrounds the first intermediate body 100a, so that it only has the freedom to move in the front and back direction. When the mold closing continues, the clamping and translation unit 2 moves forward, thereby controlling the first intermediate body 100a to move forward and thus completing the punching and tearing.

[0046] like Figures 3 to 7As shown, the core-pulling and tearing unit 1 includes a contouring block 11, a side core-punching rod 12, and an upper limit block 13. The contouring block 11 is fixed on the lower template 41, the side core-punching rod 12 is inserted into the upper part of the contouring block 11, the contouring block 11 and the side core-punching rod 12 pass through the lower ejector plate 42, and the upper limit block 13 is fixed to the lower part of the upper template 31. The contouring block 11 includes a first front contouring arc surface 111 that matches the front inner surface of the coarse opening 101 and a first rear contouring arc surface 112 that matches the rear inner surface of the coarse opening 101. The side core-punching rod 12 includes a second front contouring arc surface 121 that matches the front inner surface of the narrow opening 102, a second rear contouring arc surface 122 that matches the rear inner surface of the narrow opening 102, and a tearing part 123 located in the middle of the second front contouring arc surface 121. The upper limit block 13 has at least one pillow surface 131 that matches the upper part of the second rear contouring arc surface 122.

[0047] The contour block 11 matches the inner shape of the coarse opening 101. However, because the first intermediate body 100a needs to translate during the punching process, the first front contour arc surface 111 and the first rear contour arc surface 112 are used to restrict the final and initial positions of the coarse opening 101 during the mold closing process, respectively. Similarly, the second front contour arc surface 121 and the second rear contour arc surface 122 restrict the final and initial positions of the narrow opening 102 during the mold closing process, respectively. During the stamping process, the workpiece will move backward, which will cause the punching part 123 to punch forward and break the side wall of the narrow opening 102. Therefore, the workpiece will also generate a backward reaction force on the middle part of the side punch mandrel 12. In order to keep the side punch mandrel 12 stable after being subjected to force, the lower part of the side punch mandrel 12 is tightly surrounded by the contour block 11, while its upper part is attached to the backrest surface 131. In this way, the side punch mandrel 12 can be fixed in position and achieve the punching effect. In order to achieve the purpose of fixing the upper part of the side punch 12, the upper limit block 13 can also be replaced by a limit rod that can be inserted into the side punch 12 or a limit insert that surrounds the top of the side punch 12.

[0048] like Figure 3 , Figure 8 , Figure 9 and Figure 10As shown, the clamping translation unit 2 includes a front clamping component 21, a rear clamping component 22 and a pair of angle limiting components 23. The front clamping component 21 and the rear clamping component 22 are respectively located on the front and rear sides of the core pulling and punching unit 1, and the pair of angle limiting components 23 are respectively located on the left and right sides of the core pulling and punching unit 1. The front clamping assembly 21 includes a front clamping slider 211 located in front of the contouring block 11, a front reset elastic member 212 providing forward elastic force to the front clamping slider 211, and a first side stamping block 213 driving the front clamping slider 211 to move backward. The rear clamping assembly 22 includes a rear clamping slider 221 located behind the contouring block 11, a rear reset elastic member 222 providing forward elastic force to the rear clamping slider 221, and a second side stamping block 223 driving the rear clamping slider 221 to move forward. The angle limiting assembly 23 includes a protruding slider 231 that engages with the angle limiting notch 106 and a side reset elastic member 232 providing forward elastic force to the protruding slider 231. The front clamping slider 211 and the front reset elastic member 212 are mounted on the upper release plate 32, and the first side stamping block 213 is fixed to the upper template 31 and can pass through the upper release plate 32. The rear clamping slider 221 and the rear reset elastic element 222 are mounted on the lower ejector plate 42, and the second side stamping block 223 is fixed on the upper template 31 and passes through the upper ejector plate 32. The front clamping slider 211 is embedded with a clearance insert 214 located opposite to the punching and tearing part 123. The front reset elastic element 212 is a pair of gas springs respectively located on the left and right sides of the core-pulling punching and tearing unit 1.

[0049] When the first intermediate body 100a is placed on the lower ejector plate 42, the skirt 105 sits on the upper surface of the lower ejector plate 42, and the two protruding sliders 231 roughly limit the position of the first intermediate body 100a using the angle limiting notch 106, so that the first intermediate body 100a moves under certain constraints. In the first stage of mold closing, the front clamping slider 211 and the rear clamping slider 221 together surround the outer wall of the wide opening 101. Under the combined action of the front reset elastic member 212 and the rear reset elastic member 222, the first intermediate body 100a is in the first horizontal position. At this time, the first rear contoured arc surface 112 is attached to the rear inner wall of the wide opening 101, and the second rear contoured arc surface 122 is attached to the rear inner wall of the narrow opening 102. In the second stage of mold closing, the first side stamping block 213 and the second side stamping block 223 will cause the front clamping slider 211 and the rear clamping slider 221 to move backward against the elastic force, respectively. The skirt 105 will also push the protruding slider 231 to move backward against the elastic force, reaching the second horizontal position. At this time, the first front contoured arc surface 111 is attached to the front inner wall of the coarse opening 101, and the second front contoured arc surface 121 is attached to the front inner wall of the narrow opening 102. When the second horizontal position is reached, the front sides of the workpiece are clamped by the front clamping slider 211 and the second front contoured arc surface 121, respectively, and the punching part 123 passes through the side wall of the narrow opening 102 and partially enters the relief insert 214, so that the side wall of the narrow opening 102 will form a raised part 104. The front clamping assembly 21 and the rear clamping assembly 22 are respectively mounted on the upper mold 3 and the lower mold 4. Therefore, when the first intermediate body 100a is in place, only three sides are blocked (the rear is blocked by the rear clamping slider 221, and the left and right sides are blocked by the protruding sliders 231). The remaining side allows the first intermediate body 100a to be adjusted and placed in position. The avoidance insert 214 is independent of the front clamping slider 211. In the design, the contact surface of the front clamping slider 211 is hollowed out in the middle, and then the avoidance insert 214 is embedded. The reason for this design is that the front clamping slider 211 only needs to focus on fitting with the outer surface of the rough edge 101, while the avoidance insert 214 focuses on alignment with the punching part 123, making adjustment convenient.

[0050] The working process of the inner punch die 200 for the car fuel filler neck is as follows:

[0051] 1. Before stamping, the first intermediate body 100a is placed on the lower stripper plate 42 with the skirt 105 facing down, so that the two angle limiting notches 106 on the left and right sides of the skirt 105 are locked on their respective protruding sliders 231. At this time, the rough opening 101 of the first intermediate body 100a is located outside the side punching mandrel 12, and the slider 221 is then held close to the rear of the rough opening 101.

[0052] 2. In the first stage of mold closing, the upper mold 3 descends until the lower surface of the upper ejector plate 32 contacts the upper surface of the lower ejector plate 42. Thus, when the lower ejector plate 42 descends, the front clamping slider 211 reaches the front of the roughing nozzle 101.

[0053] 3. In the second stage of mold closing, the upper mold 3 presses down the lower ejector plate 42 until the upper ejector plate 32 reaches its lowest point. The side punch 12 and the contour block 11 can further pass through the lower ejector plate 42 and enter the inner side of the first intermediate body 100a. The upper part of the side punch 12 begins to contact the pillow surface 131. The rear part of the first intermediate body 100a is clamped by the first rear contour arc surface 112, the second rear contour arc surface 122 and the rear clamping slider 221.

[0054] 4. In the third stage of mold closing, the upper mold plate 31 continues to descend. The first side stamping block 213 and the second side stamping block 223 respectively move the front clamping slider 211 and the rear clamping slider 221 backward. The first intermediate body 100a and the two protruding sliders 231 move backward together until the front part of the first intermediate body 100a is clamped by the first front contoured arc surface 111, the second front contoured arc surface 121 and the front clamping slider 211. At the same time, the punching and tearing part 123 punches through the inner wall of the narrow opening 102 to form the vent 103 and the raised part 104, thus obtaining the second intermediate body 100b.

[0055] 5. Open the mold. The clamping and translation unit 2 releases the second intermediate body 100b. The lower ejector plate 42 causes the second intermediate body 100b to rise and the side punch core 12 to exit the rough opening 101. The second intermediate body 100b is removed from the mold and then replaced with a new first intermediate body 100a.

[0056] The above descriptions are merely some embodiments of the present invention. Those skilled in the art can make various modifications and improvements without departing from the inventive concept of the present invention, and these all fall within the scope of protection of the present invention.

Claims

1. A stamping die for the inner side of an automotive fuel filler neck, used to process an automotive fuel filler neck from a first intermediate body into a second intermediate body, the first intermediate body comprising an integrally formed coarse opening and a fine opening, the second intermediate body further comprising a vent located on the fine opening and a raised portion turned outward on one side of the vent; characterized in that: The automobile oil filler inner side die comprises a core-pulling punch tearing unit, a clamping translation unit, an upper die and a lower die; The core-pulling punch tearing unit comprises a profiling seat block arranged on the lower die and a side punch core rod inserted into the upper part of the profiling seat block, the profiling seat block comprises a first front profiling curved surface matched with the front inner surface of the rough port and a first rear profiling curved surface matched with the rear inner surface of the rough port; the side punch core rod comprises a second front profiling curved surface matched with the front inner surface of the fine port, a second rear profiling curved surface matched with the rear inner surface of the fine port and a tearing part arranged in the middle part of the second front profiling curved surface; The clamping translation unit is used to clamp the first intermediate body and make it translate backward relative to the core-pulling punch tearing unit, so that the tearing part tears the front sidewall of the fine port to obtain the air port and the raised part; The upper die comprises an upper die plate and an upper stripper plate elastically floating below the upper die plate, and the lower die comprises a lower die plate and a lower stripper plate elastically floating above the lower die plate; The clamping translation unit comprises a front clamping assembly and a rear clamping assembly, the front clamping assembly and the rear clamping assembly are arranged on the front and rear sides of the core-pulling punch tearing unit, the front clamping assembly comprises a front clamping sliding block located in front of the profiling seat block, a front reset elastic member providing forward elastic force to the front clamping sliding block and a first side punch block driving the front clamping sliding block to move backward, and the rear clamping assembly comprises a rear clamping sliding block located behind the profiling seat block, a rear reset elastic member providing forward elastic force to the rear clamping sliding block and a second side punch block driving the rear clamping sliding block to move forward.

2. The automotive filler inner side punch die according to claim 1, characterized in that: The profiling seat block is fixed on the lower die plate, and the profiling seat block and the side punch core rod pass through the lower stripper plate.

3. The automotive filler inner side punch die of claim 1, wherein: The core-pulling punch tearing unit further comprises an upper limiting block, the upper limiting block is fixed on the lower part of the upper die plate, and the upper limiting block has at least one backrest surface matched with the upper part of the second rear profiling curved surface.

4. The automotive filler inner side punch die of claim 1, wherein: The front clamping sliding block is inlaid with an avoidance insert block located at the relative position of the tearing part.

5. The automotive filler inner side punch die of claim 1, wherein: The front clamping sliding block and the front reset elastic member are arranged on the upper stripper plate, the first side punch block is fixed on the upper die plate and can pass through the upper stripper plate, the rear clamping sliding block and the rear reset elastic member are arranged on the lower stripper plate, and the second side punch block is fixed on the upper die plate and passes through the upper stripper plate.

6. The automotive filler inner side punch die of claim 1, wherein: The bottom of the first intermediate body has a skirt, the left and right sides of the skirt are respectively provided with an angle limiting notch, the clamping translation unit further comprises a pair of angle limiting assemblies respectively located on the left and right sides of the core-pulling punch tearing unit, the angle limiting assembly comprises a protruding sliding block clamped into the angle limiting notch and a side reset elastic member providing forward elastic force to the protruding sliding block.

7. The automotive filler inner side punch die of claim 1, wherein: The front reset elastic member is a pair of gas springs arranged on the left and right sides of the core-pulling punch tearing unit.

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