Boss drawing die

Abstract

The utility model discloses a boss drawing die, which comprises an upper die, a lower die, a lower die and a lower die, the lower die is respectively provided with a groove for placing a product and a forming cavity for forming the annular boss; the groove is located in the upper surface of the lower die, the forming cavity is located in the lower die, and the groove and the forming cavity are communicated up and down; when the upper die and the lower die are closed, the stretching head stamps into the forming cavity to stretch a product downwards to form an annular boss, and the boss stretching die can machine a boss on a plate with a certain thickness.

Description

Technical Field

[0001] This utility model relates to the field of mold technology, and in particular to a boss stretching mold. Background Technology

[0002] The common method for constructing boss housings is as follows: first, cold-drawn sheet metal is placed between mating forming punches and dies; then, the forming punches and dies are stretched using power extrusion, thereby drawing the cold-drawn sheet metal into the desired boss housing shape. For example... Figure 1 The diagram shows a handle base. This product 1 is used in manual and electric pallet jacks (also known as pallet trucks). Named the handle base (also known as the big foot), it is the connecting structure between the handle and the hydraulic cylinder, welded to the bottom of the handle and connected to the hydraulic cylinder via a pin. Product 1 has two annular bosses 110. The general manufacturing process involves first stamping the sheet metal to create the outer shape, and then punching through holes 120 in the outer shape (e.g., ...). Figure 2 Next, weld the annular boss 110 to the through hole 120 (e.g., Figure 3 Finally, it is bent into shape (such as...). Figure 1 The annular boss 110 is directly welded onto it, resulting in low connection strength and high labor intensity.

[0003] According to existing technology, there is a stretching die for a boss housing, publication number CN203253816U, which includes a cooperating upper die and a lower die. The upper die includes an upper template with a forming punch at its bottom. The lower die includes a lower template with guide pillars at both ends for the upper template to move up and down. A forming die is provided at the top of the lower template corresponding to the forming punch. An ejector pin is embedded in the center of the forming die, and an ejector pin hole is provided on the forming punch corresponding to the ejector pin. The ejector pin pierces the cold-drawn sheet material, forming a circular hole in its center. The cold-drawn sheet material then extends along the circular hole, completing the processing of the boss housing. However, this is for processing very thin sheets. To ensure the strength of the handle seat, the handle seat has a certain thickness, and the ejector pin cannot pierce the handle seat, making it impossible to process bosses on sheets with a certain thickness. Utility Model Content

[0004] The technical problem to be solved by this utility model is to overcome the defects of the prior art and provide a boss stretching mold that can process bosses on plates of a certain thickness.

[0005] To achieve the above objectives, the technical solution of this utility model is: a boss stretching die, comprising:

[0006] The upper mold has a stretching head on its bottom surface;

[0007] The lower mold is provided with a groove for placing the product and a forming cavity for forming an annular boss; the groove is located on the upper surface of the lower mold, the forming cavity is located inside the lower mold, and the groove and the forming cavity are connected vertically.

[0008] When the upper and lower molds are closed, the stretching head is pressed into the forming cavity to stretch the product downwards and form an annular boss.

[0009] With the above structure, this utility model has the following advantages compared with the prior art: A stretching head is provided in the upper mold, and a groove and a forming cavity are respectively provided in the lower mold. The stretching head directly punches and stretches the product located in the groove, forming an annular boss in the forming cavity, thus realizing the processing of bosses on plates of a certain thickness. When processing the annular boss, the product can be pre-punched with holes, or it can be stretched simultaneously while punching holes in this mold.

[0010] Preferably, the stretching head includes a guide portion and a forming portion. The forming portion protrudes from the outer surface of the upper end of the guide portion. When the product is pre-punched with a through hole, the guide portion slides within the through hole to provide guidance; when the product is not pre-punched with a through hole, the guide portion directly punches the through hole in the product. The forming portion is used to stretch the through hole, forming an annular boss under the action of the forming groove and the forming portion.

[0011] Preferably, the guide portion and the forming portion have an arc transition, which facilitates the forming portion to stretch the through hole.

[0012] Preferably, the molding cavity corresponds one-to-one with the annular boss.

[0013] Preferably, the bottom surface of the upper mold is provided with guide posts, and the upper surface of the lower mold is provided with guide grooves corresponding to the guide posts, which guide the upper mold.

[0014] As a preferred option, it also includes:

[0015] An auxiliary plate is used to press the product. The auxiliary plate is located between the upper mold and the lower mold. The stretching head penetrates the auxiliary plate downward and slides up and down with the auxiliary plate.

[0016] A connector, the lower end of which is provided on an auxiliary plate, and the upper end of which slides and engages with the upper mold.

[0017] When the upper mold closes downwards, the auxiliary plate moves downwards with the upper mold and presses against the upper surface of the product. The auxiliary plate presses the product firmly to prevent it from flying out during the stretching process, ensuring high reliability.

[0018] Preferably, it also includes an auxiliary spring connected between the auxiliary plate and the upper mold; when the upper mold and the lower mold are demolded, the auxiliary spring uses its elastic force to push the upper mold upward, so that the stretching head is separated from the product, which facilitates the stretching head from the product and facilitates demolding.

[0019] Preferably, the upper surface of the upper mold is provided with a sliding groove, and the upper end of the connector slides and engages in the sliding groove, which facilitates the sliding engagement of the connector in the upper mold and facilitates the installation of the connector.

[0020] Preferably, the upper end of the connector is larger than the lower end to prevent the auxiliary plate from detaching from the upper mold, thus ensuring high reliability. Attached Figure Description

[0021] Figure 1 It is a 3D model of the product.

[0022] Figure 2 It is a 3D view of the sheet metal after it has been punched.

[0023] Figure 3 It is a 3D diagram of a sheet metal processing plant with annular bosses.

[0024] Figure 4 This is a front sectional view of a boss stretching mold before mold closing, according to this utility model.

[0025] Figure 5 This is a front sectional view of a boss stretching mold after mold closing according to this utility model.

[0026] Among them, 1. Product, 110. Annular boss, 120. Through hole, 2. Auxiliary spring, 3. Upper mold, 310. Guide post, 320. Slide groove, 4. Lower mold, 410. Groove, 420. Forming cavity, 430. Guide groove, 5. Stretching head, 510. Guide part, 520. Forming part, 6. Auxiliary plate, 7. Connector. Detailed Implementation

[0027] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0028] Figure 1 This is a 3D view of the product. Product 1 is used in manual and electric pallet trucks (also known as pallet jacks). It is called the handle seat (also known as the big foot) and is the connecting structure between the handle and the hydraulic cylinder. It is welded to the bottom of the handle and connected to the hydraulic cylinder via a pin. Product 1 has an annular boss 110 and a through hole 120. The annular boss 110 is located at the through hole 120, and the axis of the annular boss 110 and the axis of the through hole 120 are on the same straight line. The diameter of the through hole 120 is larger than the inner diameter of the annular boss 110.

[0029] Figure 4 This is a front sectional view of a boss stretching mold before mold closing, as described in this utility model. Figure 4 In the embodiment shown, a boss stretching die includes an upper die 3 and a lower die 4. The bottom surface of the upper die 3 is provided with a stretching head 5. The stretching head 5 can stretch the through hole 120 to form an annular boss 110 on the bottom surface of the product. Alternatively, the through hole 120 can be punched on the surface of the product 1 first, and the through hole 120 can be stretched to form an annular boss 110. The lower die 4 is provided with a groove 410 and a forming cavity 420. The groove 410 is provided on the upper surface of the lower die 4 to prevent the product 1 from being stretched. The forming cavity 420 is provided in the lower die 4 to form the annular boss 110. The stretching head 5 stretches a part of the product 1 into the forming cavity 420. Under the action of the stretching head 5 and the forming cavity 420, the part of the product 1 that extends into the forming cavity 420 forms the annular boss 110.

[0030] In one embodiment, the stretching head 5 includes a guide portion 510 and a forming portion 520. The forming portion 520 is located above the guide portion 510 and protrudes from the outer side of the upper end of the guide portion. When the product 1 pre-punches a through hole 120, the guide portion 510 slides within the through hole 120 to provide guidance; when the product 1 is not pre-punched with a through hole 120, the guide portion 510 directly punches the through hole 120 into the product 1. The forming portion 520 is used to stretch the through hole 120, forming an annular boss 110 under the action of the forming groove 420 and the forming portion 520. Specifically, the guide portion 510 and the forming portion 520 have an arc-shaped transition, reducing friction between the forming portion 520 and the inner wall of the through hole 120, thus facilitating the stretching of the through hole 120.

[0031] As one embodiment, the molding cavity 420 corresponds one-to-one with the annular boss 110, and one molding cavity 420 forms one annular boss 110. Since the annular boss 110 is formed by the molding cavity 420 and the molding part 520 pressing the product 1, the molding cavity 420 and the annular boss 110 correspond one-to-one, ensuring that the molding of the annular boss 110 is highly reliable.

[0032] As one embodiment, in order to guide the upper mold 3, a guide post 310 is provided on the bottom surface of the upper mold 3, and a guide groove 430 corresponding to the guide post 310 is provided on the upper surface of the lower mold 4, which plays a guiding role for the upper mold 3. Specifically, there are two guide posts 310, and the guide posts 310 and guide grooves 430 correspond one-to-one, resulting in a better guiding effect.

[0033] Figure 5 This is a front sectional view of a boss stretching mold after mold closing, as described in this utility model. Figure 5In the illustrated embodiment, it also includes an auxiliary plate 6, which is used to press the product 1 firmly to prevent the product 1 from flying out of the groove 410 during stamping or stretching. Specifically, to facilitate the upper die 3 to drive the auxiliary plate 6 to move up and down, it also includes a connector 7, which is connected between the upper die 3 and the auxiliary plate 6. Specifically, to ensure that the stretching head 5 can continue to punch or stretch the product 1 when the auxiliary plate 6 is pressed on it, the upper end of the connector 7 is slidably fitted within the upper die 3. Specifically, the upper die 3 is provided with a slide groove 320, and the upper end of the connector 7 is slidably fitted within the slide groove 320. Specifically, to prevent the connector 7 from detaching from the upper die 3, the diameter of the upper end of the connector 7 is larger than the diameter of the lower end of the connector 7, and the upper end of the connector 7 is slidably fitted up and down within the slide groove 320.

[0034] Specifically, the connector 7 is a screw, with the lower end of the connector 7 screwed onto the auxiliary plate 6, and the upper end of the connector 7 extending upward through the upper mold 3 and into the slide groove 320.

[0035] Specifically, the stretching head 5 and the guide rod 310 are slidably mounted on the auxiliary plate 6, ensuring that the stretching head 5 and the guide rod 310 can continue to move even when the auxiliary plate 6 is stationary.

[0036] As one embodiment, in order to assist in the demolding of product 1, it also includes an auxiliary spring 2, which is connected between the auxiliary plate 6 and the upper mold 3. During the process of the upper mold 3 and the lower mold 4 closing, when the auxiliary plate 6 abuts against the upper surface of the lower mold 4 and the upper mold 3 continues to move downward, the upper mold 3 compresses the auxiliary spring 2. When the upper mold 3 and the lower mold 4 are demolded, the auxiliary spring 2 pushes the upper mold 3 upward by its elastic force, so that the stretching head 5 is separated from the product 1, which facilitates the separation of the stretching head 5 from the product 1 and facilitates the demolding of product 1.

[0037] Specifically, the principle of this invention is to set a stretching head 5 on the upper mold 3, and to set a groove 410 and a forming cavity 420 on the lower mold 4. The stretching head 5 is used to directly press and stretch the product 1 located in the groove 410, so that the product forms an annular boss 110 in the forming cavity 420, thus realizing the processing of a boss on a plate of a certain thickness. When processing the annular boss 110 on the product 1, the product can be pre-punched with a through hole 120, or the annular boss 110 can be stretched at the same time as punching the through hole 120 on this mold.

[0038] Operation process: Pre-punch through hole 120 for product 1: 1. Place product 1 in groove 410. At this time, product 1 placed in groove 410 is as follows: Figure 2As shown; Second, during mold closing, the guide portion 510 of the stretching head 5 slides downward and engages within the through hole 120. At this time, the auxiliary plate 6 abuts against the upper surface of the lower mold 4 to press the product 1 tightly; Third, when the forming portion 520 of the stretching head 5 touches the product 1, the stretching head 5 continues to move downward, the auxiliary spring 2 is compressed, and the forming portion 520 stretches downward against the through hole 120. A portion of the product 1 is stretched into the forming cavity 420. Under the action of the stretching head 5 and the forming cavity 420, the portion of the product 1 extending into the forming cavity 420 forms an annular boss 110, as shown. Figure 5 4. When the mold opens, the auxiliary spring 2 drives the upper mold 1 to move upward, and the connecting piece 7 slides within the upper mold 1. At this time, the stretching head 5 also moves upward with the upper mold 1, as shown below. Figure 4 Due to the obstruction of the auxiliary plate 6, the stretching head 5 disengages from product 1, facilitating the demolding of product 1. At this point, the molded product 1 is as follows: Figure 3 As shown.

[0039] Without pre-punching the through hole 120 in product 1: 1. Product 1 is placed in the groove 410, and there is no through hole 120 on the plate; 2. When the mold is closed, the guide part 510 of the stretching head 5 punches downwards to form the through hole 120 in product 1. At this time, the auxiliary plate 6 abuts against the upper surface of the lower mold 4 to press product 1 tightly; 3. When the forming part 520 of the stretching head 5 touches product 1, the stretching head 5 continues to move downwards, the auxiliary spring 2 is compressed, and the forming part 520 stretches downwards to the through hole 120. A part of product 1 is stretched into the forming cavity 420. Under the action of the stretching head 5 and the forming cavity 420, the part of product 1 that extends into the forming cavity 420 forms an annular boss 110; 4. When the mold is opened, the auxiliary spring 2 drives the upper mold 1 to move upwards, and the connecting piece 7 slides in the upper mold 1. At this time, the stretching head 5 also moves upwards with the upper mold 1. Due to the obstruction of the auxiliary plate 6, the stretching head 5 disengages from product 1, facilitating the demolding of product 1.

[0040] The stretched product 1 is placed on a bending machine and bent to form the finished product, such as... Figure 1 As shown.

[0041] Therefore, the mold of this utility model can be used for stretching plates with pre-punched through holes 120, as well as for stretching plates without punched through holes 120.

[0042] Based on the above solutions, if any modifications or variations to this utility model do not depart from the spirit and scope of this utility model, and if such modifications and variations fall within the scope of the claims and equivalent technologies of this utility model, then this utility model also intends to include such modifications and variations.

Claims

1. A boss stretching die, characterized in that: It includes: Upper mold (3), the bottom surface of which is provided with a stretching head (5); The lower mold (4) is provided with a groove (410) for placing the product (1) and a forming cavity (420) for forming an annular boss (110); the groove (410) is located on the upper surface of the lower mold (4), and the forming cavity (420) is located inside the lower mold (4); the groove (410) and the forming cavity (420) are connected vertically. When the upper mold (3) and the lower mold (4) are closed, the stretching head (5) is pressed into the forming cavity (420) to stretch the product (1) downward to form an annular boss (110).

2. The boss stretching die according to claim 1, characterized in that: The stretching head (5) includes a guide portion (510) and a forming portion (520), the forming portion (520) protruding from the outer side of the upper end of the guide portion (510).

3. The boss stretching die according to claim 2, characterized in that: The guide portion (510) and the forming portion (520) have an arc-shaped transition.

4. The boss stretching die according to claim 1, characterized in that: The forming cavity (420) corresponds one-to-one with the annular boss (110).

5. A boss stretching die according to claim 1, characterized in that: The bottom surface of the upper mold (3) is provided with guide posts (310), and the upper surface of the lower mold (4) is provided with guide grooves (430) corresponding to the guide posts (310).

6. The boss stretching die according to claim 1, characterized in that: It also includes: An auxiliary plate (6) is used to press the product (1). The auxiliary plate (6) is located between the upper mold (3) and the lower mold (4). The stretching head (5) passes through the auxiliary plate (6) downward and slides vertically with the auxiliary plate (6). Connector (7), the lower end of the connector (7) is provided on the auxiliary plate (6), and the upper end of the connector (7) slides and fits in the upper mold (3); When the upper mold (3) closes downwards, the auxiliary plate (6) moves downwards with the upper mold (3) and presses against the upper surface of the product (1).

7. A boss stretching die according to claim 6, characterized in that: It also includes an auxiliary spring (2) connected between the auxiliary plate (6) and the upper mold (3); when the upper mold (3) is demolded from the lower mold (4), the auxiliary spring (2) pushes the upper mold (3) upward by means of elasticity, so that the stretching head (5) is separated from the product (1).

8. A boss stretching die according to claim 6, characterized in that: The upper surface of the upper mold (3) is provided with a groove (320), and the upper end of the connector (7) slides up and down in the groove (320).

9. A boss stretching die according to claim 8, characterized in that: The upper dimension of the connector (7) is larger than the lower dimension of the connector (7).

Images