Stamping structure for negative angle forming

Abstract

The utility model belongs to the field of mold structures, and discloses a stamping structure for negative angle forming, which comprises a fixed mold plate and a mold core block, the mold core block is provided with an inclined forming surface, and the bottom projection is positioned on the inner side of the top projection; the movable mold plate is provided with a fixed seat; the stamping tapered wedge is mounted on the fixed seat; and the guide sliding assembly is mounted on the movable mold plate. The stamping wedge rotates around the fixing base, the stamping wedge can obtain relatively large displacement through small angle change so as to give way to the negative angle of the forming face of the core block, compared with a lateral stamping structure, the stroke needed by stamping forming of an original die cannot be changed, the occupied space is smaller, the die design and manufacturing difficulty is lowered, and the cost is reduced. Due to the fact that the stamping wedge can rotate, the stamping precision can be controlled only by ensuring the position relation between the thickness of the working end of the stamping wedge and the guide sliding assembly, manufacturing is easy, manufacturing cost is low, a mechanical mode is easy to operate, the stamping wedge and the guide sliding assembly are arranged separately, and maintenance and replacement are easy.

Description

TECHNICAL FIELD

[0001] The utility model belongs to die structure technical field, concretely relates to a stamping structure for negative angle forming. BACKGROUND

[0002] The stamping die structure can only make the workpiece bend 0°-90° when stamping the part, and the bending angle exceeding 90° is called negative angle, and the negative angle will hinder the vertical movement of the stamping structure, and thus it is difficult to form the negative angle workpiece.

[0003] In the prior art, a lateral stamping cam and a reset assembly are installed on the fixed die, and a pressing cam is installed on the movable die, so that the movable die drives the pressing cam to drive the lateral stamping cam to convert the vertical movement into horizontal movement to form the negative angle of the workpiece, and the reset assembly is used to elastically reset the stamping cam, and this method is commonly called lateral stamping, and the forming by this method can effectively avoid the interference of the negative angle on the vertical movement of the die.

[0004] However, in a progressive die, the die cost is high and difficult to replace, and a plurality of positioning structures, guide structures and monitoring structures need to be arranged to protect the die, and in the lateral stamping, the stroke amount of the slide is large, which may affect the overall design of the die, increase the difficulty of die design and manufacturing, and the large stroke amount may reduce the operation efficiency. UTILITY MODEL CONTENT

[0005] The utility model intends to provide a stamping structure for negative angle forming to solve the problem that the existing negative angle forming structure increases the difficulty of die design and manufacturing.

[0006] In order to achieve the above purpose, the utility model provides the following technical scheme: a stamping structure for negative angle forming, comprising

[0007] The fixed die plate is provided with a core block at the top, the core block has at least one inclined forming surface, and the horizontal projection of the bottom of the forming surface is located inside the horizontal projection of the top of the forming surface;

[0008] The movable die plate is provided with a fixed seat at the bottom;

[0009] The stamping cam is rotatably installed on the fixed seat, the stamping cam has a stamping surface matched with the forming surface, the wedge surface of the stamping cam is located on the side of the stamping cam away from the forming surface, the thickness between the wedge surface and the stamping surface increases from bottom to top, and the bottom surface of the stamping cam has a first sliding guide surface;

[0010] The sliding guide assembly is installed on the movable die plate and in sliding abutment with the wedge surface.

[0011] Principle and effect of the technical scheme:

[0012] 1. By allowing the stamping wedge to rotate around the fixed base, the stamping wedge can obtain a relatively large displacement through a small angle change, thereby making way for the negative angle of the core block forming surface. Compared with the side stamping structure, it does not change the stroke required for the original die stamping (no need to set up an additional slider for horizontal sliding, thus not increasing the stroke). The smaller angle change occupies less space, reducing the difficulty of die design and manufacturing. Since the stamping wedge can rotate, it is only necessary to ensure the positional relationship between the thickness of the working end of the stamping wedge and the guide slide assembly to control the stamping accuracy. It is simple to manufacture, has low production cost, and is easy to operate mechanically. Furthermore, the stamping wedge and the guide slide assembly are set separately, which is easy for subsequent maintenance and replacement.

[0013] 2. By setting the first guide surface, during the downward pressing process driven by the moving template, the first guide surface abuts against the workpiece, allowing the stamping wedge to rotate around the fixed seat. This causes the bottom of the stamping wedge to be misaligned with the top of the forming surface. As the moving template continues to move downward, the stamping wedge abuts against the guide component. The stamping wedge is guided and limited by the guide component to rotate towards the side closer to the forming surface (and since the thickness of the lower end of the working end of the stamping wedge is less than the thickness of the upper end, this rotation will not cause behavioral interference). This continues until the moving template moves to the lowest point of its stroke. At this time, the stamping surface and the forming surface abut against each other and the stamping wedge is pressed against the guide component and cannot move downward any further.

[0014] The present invention is further configured such that: a receiving groove is provided at the bottom of the fixed base, a rotating shaft is installed in the receiving groove, and a stamped wedge is fitted onto the rotating shaft.

[0015] The principle and effect of this technical solution: By fitting the stamped wedge onto the rotating shaft, the stamped wedge can rotate around the rotating shaft. At the same time, the stamped wedge rotates within the receiving groove, and the rotation amount of the stamped wedge is limited by the receiving groove. By limiting the positional relationship between the receiving groove and the stamped wedge, misalignment or excessive rotation can be avoided.

[0016] The present invention is further configured such that the top of the stamped wedge abuts against the moving template.

[0017] The principle and effect of this technical solution: By making the top of the stamping wedge abut against the moving template, the moving template can directly apply pressure to the stamping wedge, thereby enabling the stamping wedge to have a large stamping force to bend and form the workpiece. It also avoids the use of a rotating shaft to provide stamping force to the stamping wedge, thus reducing the requirements for the quality of the rotating shaft.

[0018] The present invention is further configured such that: the top of the fixed base is provided with a hanging groove, the hanging groove is connected to the receiving groove, and the end of the rotating shaft slides against the hanging groove.

[0019] The principle and effect of this technical solution: By setting the mounting groove, the stamped wedge can be installed on the fixed base by hanging, and it is more convenient and faster to disassemble and maintain the stamped wedge.

[0020] The present invention is further configured such that: the guide slide assembly includes a guide slide block, the guide slide block is installed on the fixed template, the guide slide block has a second guide slide surface, the second guide slide surface slides against the wedge surface, and the angle between the second guide slide surface and the vertical direction is smaller than the angle between the wedge surface and the vertical direction.

[0021] The principle and effect of this technical solution: The second guide surface of the guide slider guides and limits the inclined surface of the stamping wedge, so that the stamping wedge can gradually rotate during the pressing process to make the forming surface match the stamping surface, thereby forming the negative angle of the part. Furthermore, by making the inclination angle of the second guide surface in the vertical direction smaller than that of the wedge surface, the stamping wedge can rotate during the rising process to make way for the forming surface of the core block, thus avoiding the interference of the guide slider with the rotation of the stamping wedge.

[0022] The present invention is further configured such that: a side-blocking guide plate is detachably installed on the side of the guide slider near the stamping wedge, and the second guide surface is located on the side-blocking guide plate.

[0023] The principle and effect of this technical solution: By setting up a detachable side guide plate, the side guide plate does not need to be removed after wear, making it easy to replace and maintain, and saving costs.

[0024] The present invention is further configured to include a nitrogen spring, which is mounted on the moving template. A mounting bracket is movably mounted on the bottom of the fixed base. A pressure plate is fixed on the bottom of the mounting bracket. The pressure plate is adapted to the top surface of the core block. The end of the nitrogen spring passes through the fixed base and is connected to the mounting bracket.

[0025] The principle and effect of this technical solution: By setting up a nitrogen spring, the pressure plate can first contact the workpiece, thereby limiting the part of the workpiece that is not involved in the forming process, preventing deformation of the workpiece during negative angle bending forming, and ensuring forming accuracy. By compressing the nitrogen spring, the moving template can be lowered normally, thereby avoiding behavioral interference. Attached Figure Description

[0026] Figure 1 This is an isometric view of the present invention;

[0027] Figure 2 for Figure 1 Cross-sectional structural diagram;

[0028] Figure 3 for Figure 2 Enlarged view of point A in the image;

[0029] Figure 4 for Figure 3 Axonometric structural diagram of a partial explosion in the image;

[0030] Figure 5 for Figure 3 Partial isometric structural diagram. Detailed Implementation

[0031] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments:

[0032] The reference numerals in the accompanying drawings include:

[0033] 101. Template; 102. Core block; 103. Molding surface;

[0034] 201. Moving template; 202. Fixed base; 203. Receiving groove; 204. Rotating shaft; 205. Hanging groove;

[0035] 301. Stamped wedge; 302. Stamped surface; 303. Wedge surface; 304. First guide surface;

[0036] 401. Guide block; 402. Anti-side guide plate; 403. Second guide surface;

[0037] 501. Nitrogen spring; 502. Mounting bracket; 503. Pressure plate.

[0038] Example:

[0039] As attached Figures 1-5 As shown in the figure, this utility model discloses a stamping structure for negative angle forming, including a fixed template 101, a movable template 201, a stamping wedge 301, a nitrogen spring 501, and a guide slide assembly. The fixed template 101 is installed on the worktable of the machine tool. A core block 102 is installed on the top of the fixed template 101 (specifically, it can be installed by bolt connection or pin positioning). The core block 102 has at least one inclined forming surface 103, and the horizontal projection of the bottom of the forming surface 103 is located inside the horizontal projection of the top of the forming surface 103 (in this solution, as shown in the figure, the core block 102 has two opposing forming surfaces 103).

[0040] The movable template 201 is installed on the movable end of the hydraulic cylinder. A fixed seat 202 (which can be bolted or pin-positioned) is installed at the bottom of the movable template 201. A receiving groove 203 is provided at the bottom of the fixed seat 202, and a hanging groove 205 is provided at the top of the fixed seat 202. The hanging groove 205 is connected to the receiving groove 203. The stamping wedge 301 passes through the receiving groove 203, and a rotating shaft 204 is fixedly fitted on the stamping wedge 301. By controlling the gap between the receiving groove 203 and the stamping wedge 301, the maximum rotation of the stamping wedge 301 around the rotating shaft 204 can be controlled. The rotating shaft 204 extends to the two ends of the mounting grooves 205 on both sides. The rotating shaft 204 and the mounting grooves 205 are in sliding fit. The top of the stamping wedge 301 abuts against the moving template 201. The top surface of the stamping wedge 301 has an arc-shaped surface, and the center of the arc-shaped surface is located on the axis of the rotating shaft 204. Under the action of gravity, the rotating shaft 204 will abut against the bottom of the mounting groove 205. At this time, the top surface of the stamping wedge 301 still abuts against the moving template 201. As a result, the vertical direction of the stamping wedge 301 is restricted. The stamping wedge 301 can only rotate around the rotating shaft 204.

[0041] The stamped wedge 301 has a stamping surface 302 that is adapted to the forming surface 103. The wedge surface 303 of the stamped wedge 301 is located on the side of the stamped wedge 301 away from the forming surface 103. The thickness between the wedge surface 303 and the stamping surface 302 increases from bottom to top. The bottom surface of the stamped wedge 301 has a first guide surface 304.

[0042] The guide slide assembly includes a guide slide block 401 and an anti-side guide plate 402. The guide slide block 401 is mounted on the fixed template 101. The anti-side guide plate 402 is detachably mounted on the side of the guide slide block 401 near the stamping wedge 301. The second guide slide surface 403 is located on the anti-side guide plate 402. The second guide slide surface 403 slides against the wedge surface 303, and the angle between the second guide slide surface 403 and the vertical direction is smaller than the angle between the wedge surface 303 and the vertical direction.

[0043] Nitrogen spring 501 is installed on moving template 201. Mounting bracket 502 is movably installed on the bottom of fixed base 202. Pressure plate 503 is fixed on the bottom of mounting bracket 502. Pressure plate 503 is adapted to the top surface of core block 102. The end of nitrogen spring 501 passes through fixed base 202 and is connected to mounting bracket 502.

[0044] The above descriptions are merely embodiments of this utility model. Commonly known technical solutions or characteristics are not described in detail here. It should be noted that those skilled in the art can make various modifications and improvements without departing from the technical solution of this utility model. These modifications and improvements should also be considered within the scope of protection of this utility model, and will not affect the effectiveness of the implementation of this utility model or the practicality of the patent. The scope of protection claimed in this application should be determined by the content of its claims, and the specific embodiments described in the specification can be used to interpret the content of the claims.

Claims

1. A stamping structure for negative angle forming, characterized in that: include A template is provided, and a core block is installed on top of it. The core block has at least one inclined molding surface, and the horizontal projection of the bottom of the molding surface is located inside the horizontal projection of the top of the molding surface. The movable template has a fixed base installed at the bottom. A stamped wedge is rotatably mounted on the fixed base. The stamped wedge has a stamping surface that matches the forming surface. The wedge surface of the stamped wedge is located on the side of the stamped wedge away from the forming surface. The thickness between the wedge surface and the stamping surface increases from bottom to top. The bottom surface of the stamped wedge has a first guide surface. The guide slide assembly is installed on the moving template and slides against the wedge surface.

2. The stamping structure for negative angle forming as described in claim 1, characterized in that: The bottom of the fixed base is provided with a receiving groove, and a rotating shaft is installed in the receiving groove. The stamped wedge is fitted onto the rotating shaft.

3. A stamping structure for negative angle forming as described in claim 2, characterized in that: The top of the stamped wedge abuts against the moving template.

4. A stamping structure for negative angle forming as described in claim 3, characterized in that: The top of the fixed base is provided with a hanging groove, which is connected to the receiving groove, and the end of the rotating shaft slides against the hanging groove.

5. A stamping structure for negative angle forming as described in claim 1, characterized in that: The guide slide assembly includes a guide slide block, which is mounted on a fixed template. The guide slide block has a second guide slide surface, which slides against the wedge surface. The angle between the second guide slide surface and the vertical direction is smaller than the angle between the wedge surface and the vertical direction.

6. A stamping structure for negative angle forming as described in claim 5, characterized in that: A side-protection guide plate is detachably installed on the side of the guide slide near the stamping wedge, and the second guide surface is located on the side-protection guide plate.

7. A stamping structure for negative angle forming as described in claim 1, characterized in that: It also includes a nitrogen spring, which is mounted on the moving template. A mounting bracket is movably mounted on the bottom of the fixed base. A pressure plate is fixed on the bottom of the mounting bracket. The pressure plate is adapted to the top surface of the core block. The end of the nitrogen spring passes through the fixed base and is connected to the mounting bracket.

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