A shaping machine early demoulding mechanism and method

Abstract

A shaping machine early demoulding mechanism and method, belonging to the technical field of powder metallurgy shaping machines. It is characterized in that: an L-shaped slider and a slider driving assembly are added to the lower side of the floating plate; the L-shaped slider includes a horizontal moving section and a vertical pressure section, the top of the moving section is slidably assembled with the bottom of the floating plate, the bottom of the pressure section is located above the demoulding rod nut, and the distance between the pressure section and the demoulding rod is less than the wall thickness of the demoulding rod nut; when the upper punch returns upward, the demoulding rod nut contacts the bottom of the pressure section of the L-shaped slider, driving the floating plate to rise, and the punch ejects the product in advance; at the same time, under the action of the slider driving assembly, the L-shaped slider is horizontally displaced away from the demoulding rod nut, ensuring space for the upper punch to continue to return upward. The present invention can complete the demoulding of the product in advance before the upper punch returns to the top dead center, providing more time for subsequent actions and greatly improving production efficiency.

Description

Technical Field

[0001] The invention relates to an early demoulding mechanism and method for a shaping machine, belonging to the technical field of powder metallurgy shaping machines. Background Art

[0002] In the prior art, after the crankshaft is pressurized and rotated 180°, the upper punch is at the bottom dead center position to complete the product shaping. After that, the product is ejected from the middle mold cavity as follows: the crankshaft continues to rotate, driving the upper punch to return to the top dead center position. In this process, Figure 1 As shown in the figure, the demoulding rod connected to the upper punch, the demoulding rod nut at the bottom contacts the floating plate of the lower punch, stretching the floating plate and the punch on it upwards, and ejecting the product from the mold cavity of the middle mold plate. Under this demoulding method, it is determined that the product can only be ejected from the mold cavity when the upper punch runs to the top dead center, thus achieving demoulding.

[0003] Since the distance of product demoulding is much shorter than the stroke of demoulding rod from bottom dead point to top dead point, the product has to wait for a long time in the mold cavity after shaping. When the demoulding rod moves to the last remaining stroke equal to the distance required for product demoulding, the demoulding rod nut contacts the lower punch floating plate, stretches the floating plate and punch upward, and ejects the product. Therefore, the demoulding angle of the product (corresponding to the rotation angle of the crankshaft) is basically determined and is the last top dead point angle (corresponding to the rotation angle of the crankshaft), which has a great impact on other actions that can only be performed after the product is demoulded, such as some automated handling and processing actions. Due to the lag in product demoulding and automated processing, the production efficiency of the shaping machine is greatly affected.

[0004] Therefore, a mold is needed that has a simple structure and can enable the product to be demoulded in advance before the upper punch is at the highest position (top dead center), providing more time for subsequent actions, thereby improving production efficiency. Summary of the invention

[0005] The purpose of the present invention is to address the deficiencies of the above-mentioned prior art and to provide a shaping machine early demoulding mechanism and method, which can complete the product demoulding in advance before the upper punch returns to the top dead point, thereby providing more time for subsequent actions and greatly improving production efficiency.

[0006] The technical solution of the present invention is as follows:

[0007] The first object of the present invention is to provide: an early demoulding mechanism of a shaping machine, comprising an upper punch, a middle template, and a floating plate connected to a lower punch, wherein a punch is provided on the top of the floating plate at a position corresponding to the mold cavity of the middle template, and a demoulding rod is fixed to the upper punch, wherein the demoulding rod passes through the middle template and the floating plate in sequence (the demoulding rod is slidably matched with the middle template and the floating plate respectively), and a demoulding rod nut (located below the floating plate) is connected to the lower part of the demoulding rod; the characteristics are:

[0008] Two sets of symmetrically arranged slider mechanisms are innovatively added to the lower side of the floating plate, each set of slider mechanisms includes: an L-shaped slider and a slider driving assembly; the L-shaped slider includes a horizontal moving section and a vertical pressure section, the top of the moving section is slidably assembled with the bottom of the floating plate, the bottom of the pressure section is located above the demoulding rod nut, and the distance between the pressure section and the demoulding rod is less than the wall thickness of the demoulding rod nut (so that the demoulding rod nut can carry the floating plate upward);

[0009] When the upper punch returns upward, the demoulding rod nut contacts the bottom of the pressure section of the L-shaped slider, driving the floating plate to rise and the punch ejects the product in advance. At the same time, under the action of the slider drive assembly, the L-shaped slider moves horizontally away from the demoulding rod nut, ensuring space for the upper punch to continue its upward return.

[0010] In the above scheme, the moving section of the L-shaped slider is slidably assembled with the floating plate, and the L-shaped slider has two position states: in and out. When the upper punch is at the bottom dead center, the L-shaped slider is in the "in" state, and the bottom of the pressure section can effectively contact the upper end surface of the demolding rod nut, and the demolding rod nut will pull the floating plate upward to perform an early demolding action. During the upward return stroke of the upper punch, the slider drive assembly drives the L-shaped slider to be in the "out" state, and the pressure section translates outward to make room for the demolding rod nut, without interfering with the continued upward movement of the demolding rod nut.

[0011] Furthermore, a pair of L-shaped guide rails are installed at the bottom of the floating plate; the moving section of the L-shaped slider has two sides of the top plate extending outward to form protrusions to slide with the pair of L-shaped guide rails. The moving section and the pressure section of the L-shaped slider can be set as a hollow structure to reduce the counterweight. The L-shaped slider cooperates with the pair of L-shaped guide rails through the protrusions on both sides of the top plate of the moving section to achieve parallel movement at the bottom of the floating plate and switch between the in and out states.

[0012] Furthermore, the slider drive assembly includes: a fixed ejector rod, a fork rod and a rolling column; the fixed ejector rod is installed at the bottom of the middle template, the fork rod is located directly below the fixed ejector rod, the floating plate is provided with a sliding cavity for the fork rod to move up and down, and the fork rod is slidably assembled in the sliding cavity; the bottom of the fork rod is provided with an inclined surface (inclined at 45°), the lowest point of the inclined surface is close to the demolding rod, and the highest point of the inclined surface is far away from the demolding rod; the rolling column is rotatably assembled in the moving section cavity of the L-shaped slider, and its cylindrical surface is in contact with the inclined surface of the fork rod.

[0013] In the above scheme, when the upper punch starts to return upward, the L-shaped slider and the floating plate are stretched upward by the demolding rod nut, and the punch starts to eject the product in advance; then, the fixed ejector rod contacts the fork rod and applies downward pressure to the fork rod, the fork rod slides downward, and uses the inclined surface to push the rolling column and the L-shaped slider into the "out" state. At this time, the L-shaped slider makes room for the demolding rod nut to continue to move upward, and at the same time, the punch completes the product demolding in advance; after that, the upper punch continues to return.

[0014] Furthermore, the upper and lower openings of the sliding cavity are respectively provided with limit seats, and the outer circumferential surface of the fork rod is provided with an outer convex slider; the outer diameter of the outer convex slider matches the inner diameter of the sliding cavity and is larger than the aperture of the center holes of the two limit seats. The outer convex slider matches the size of the sliding cavity and slides up and down to achieve the up and down displacement of the fork rod, and the two upper and lower limit seats can limit the outer convex slider to prevent the fork rod from sliding out of the sliding cavity.

[0015] Furthermore, a reset cylinder is provided, and the piston shaft of the reset cylinder is connected to the moving section of the L-shaped slider. A connecting nut is provided on the piston shaft of the reset cylinder, and a clamping gland is provided on the end surface of the moving section. The piston shaft passes through the clamping gland, and the head of the connecting nut is fixed between the clamping gland and the end surface of the moving section.

[0016] In the above scheme, the inner end of the clamping cover is provided with a groove for placing the head of the connecting nut. The clamping cover clamps the connecting nut and is fixedly connected to the end of the moving section. The piston shaft is equipped with a tightening nut to help the connecting nut to be quickly tightened and prevent loosening. The in and out states of the L-shaped slider are jointly assisted by the reset cylinder and the slider drive assembly. When the fork rod slides downward and uses the inclined surface to push the rolling column and the L-shaped slider into the "out" state, it is necessary to overcome the resistance of the reset cylinder piston shaft to put the piston shaft in a retracted state; after completing the product shaping, the reset cylinder piston shaft extends out, pushing the L-shaped slider to translate toward the demolding rod and enter the "in" state, and at the same time the rolling column pushes the fork rod to move upward and reset.

[0017] Furthermore, the pressure-bearing section of the L-shaped slider is a concave arc surface on the side close to the demoulding rod to avoid the demoulding rod nut, which can shorten the translation stroke of the L-shaped slider and make the structure more compact and stable.

[0018] The second object of the present invention is to provide: a shaping machine early demoulding method, characterized in that it comprises the following steps:

[0019] (1) After the product is shaped, when the upper punch is at the bottom dead center, the bottom of the pressure section of the L-shaped slider contacts the upper end surface of the demolding rod nut, the piston shaft of the reset cylinder is in an extended state, and the lowest point of the fork rod inclined surface contacts the cylindrical surface of the rolling column;

[0020] (2) Upward return stroke:

[0021] First, the demoulding rod nut rises with the upper punch, driving the floating plate to rise through the L-shaped slider, and the punch begins to lift the product upward in the middle mold cavity;

[0022] Next, the top of the fork rod contacts the bottom of the fixed ejector rod. Under the force of the fixed ejector rod, the fork rod slides downward under pressure while applying pressure to the rolling column through the bottom inclined surface, so that the L-shaped slider overcomes the resistance of the reset cylinder piston shaft and moves horizontally away from the demoulding rod until the highest point of the fork rod inclined surface contacts the cylindrical surface of the rolling column.

[0023] At this time, the piston shaft of the reset cylinder is in a retracted state, the L-shaped slider is in an "out" state, and the distance between the pressure section of the L-shaped slider and the demoulding rod is sufficient for the demoulding rod nut to pass upward. At the same time, the product is ejected from the middle mold cavity in advance to proceed to the next process;

[0024] Finally, the upstroke continues to return upward until it is at the top dead center position;

[0025] (3) After completing the next shaping action, when the punch is at the bottom dead center again, the piston shaft of the reset cylinder extends outward to reset, pushing the L-shaped slider to move toward the demolding rod. The bottom of the pressure section of the L-shaped slider contacts the upper end surface of the demolding rod nut, and the L-shaped slider completes the reset (the L-shaped slider is in the "forward" state). At the same time, the fork rod slides upward and resets under the push of the rolling column (the lowest point of the fork rod inclined surface contacts the cylindrical surface of the rolling column).

[0026] The present invention adds two groups of L-shaped sliders, two groups of slider driving mechanisms, and two groups of reset cylinders on the lower side of the floating plate. After the product shaping is completed, the reset cylinder pushes the L-shaped slider to the "in" position. At this time, the demoulding rod nut is in contact with the L-shaped slider. When the demoulding rod moves upward, the product can be ejected to achieve demoulding. In this process, the fork rod will contact the fixed ejection rod, and the fork rod will move downward to slowly push the L-shaped slider to the "out" position of the slider. When the floating plate is demoulded to the position where the product is completely demoulded, the L-shaped slider moves to the "out" position and makes way for the demoulding rod nut. The demoulding rod continues to move to the upper dead center position. At this time, the product has been demoulded when the demoulding rod has not reached the upper dead center position, that is, early demoulding is achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic diagram of the demoulding mechanism of the shaping machine in the background technology;

[0028] Figure 2 Schematic diagram of the early demoulding mechanism of the shaping machine in the present invention (two states from left to right: when the demoulding rod is at the bottom dead center position and the demoulding rod completes early demoulding);

[0029] Figure 3It is a structural schematic diagram of the L-shaped slider and the slider driving mechanism in the present invention (the L-shaped slider is in the "out" state);

[0030] Figure 4 It is a schematic diagram of the connection between the L-shaped slider and the reset cylinder in the present invention;

[0031] Figure 5 A cross-sectional view of the connection relationship between the L-shaped slider and the reset cylinder in the present invention;

[0032] Figure 6 It is a structural schematic diagram of the pressing cover in the present invention;

[0033] Figure 7 It is a structural schematic diagram of the reset cylinder in the present invention;

[0034] Figure 8 It is a schematic diagram of the installation of two sets of slider mechanisms and a floating plate in the present invention;

[0035] In the figure: upper punch 1, middle template 2, floating plate 3, product 4, punch 5, demoulding rod 6, demoulding rod nut 7, L-shaped slider 8, L-shaped guide rail 9, protrusion 10, fixed ejector rod 11, fork rod 12, rolling column 13, limit seat 14, outer protruding slider 15, reset cylinder 16, piston shaft 17, tightening nut 18, connecting nut 19, and pressing cover 20. DETAILED DESCRIPTION

[0036] Existing shaping machine demoulding mechanism, such as Figure 1 As shown, it includes an upper punch 1, a middle template 2, and a floating plate 3 connected to a lower punch. The product 4 after shaping is placed in the mold cavity of the middle template. A punch 5 is provided on the top of the floating plate at a position corresponding to the mold cavity of the middle template. A demolding rod 6 is fixed to the upper punch. The demolding rod passes through the middle template and the floating plate in sequence, and slides with the middle template and the floating plate respectively. A demolding rod nut 7 is threadedly connected to the lower part of the demolding rod, and the demolding rod nut is located below the floating plate.

[0037] The early demoulding mechanism of the shaping machine of the present invention is as follows: Figure 8 As shown, two sets of L-shaped sliders 8 and two sets of slider drive components are added to the lower side of the floating plate. Figure 4 As shown, the L-shaped slider is a hollow structure, including a horizontal moving section and a vertical pressure section. The pressure section is located on the side close to the demoulding rod and is a concave arc surface. A pair of L-shaped guide rails 9 are installed at the bottom of the floating plate. Both sides of the top plate of the moving section extend outward to form protrusions 10 to slide with the pair of L-shaped guide rails respectively. Figure 2 As shown in the middle left state diagram, the bottom of the pressure section is located above the demolding rod nut, and the distance between the pressure section and the demolding rod is less than the wall thickness of the demolding rod nut.

[0038] In one embodiment of the present invention, the slider driving assembly includes: a fixed ejector rod 11, a fork rod 12 and a rolling column 13; the fixed ejector rod is installed at the bottom of the middle mold plate, the fork rod is located directly below the fixed ejector rod, a sliding cavity for the fork rod to move up and down is provided on the floating plate, and the fork rod is slidably assembled in the sliding cavity; the bottom of the fork rod is provided with a 45° inclined surface, the lowest point of the inclined surface is close to the demoulding rod, and the highest point of the inclined surface is far away from the demoulding rod, and the rolling column is rotatably assembled in the moving section cavity of the L-shaped slider, and its cylindrical surface contacts the inclined surface of the fork rod. When the upper punch starts to return upward, the L-shaped slider and the floating plate are stretched upward by the demoulding rod nut, and the punch starts to push the product in advance; then, the fixed ejector rod contacts the fork rod and applies downward pressure to the fork rod, the fork rod slides downward, and uses the inclined surface to push the rolling column and the L-shaped slider into the "out" state, at this time, the L-shaped slider makes room for the demoulding rod nut to continue to move upward, and at the same time, the punch completes the demoulding of the product in advance; then, the upper punch continues to return.

[0039] In one embodiment of the present invention, the upper and lower openings of the sliding cavity are respectively provided with limit seats 14, and the outer circumferential surface of the fork rod is provided with an outer convex slider 15; the outer convex slider matches the size of the sliding cavity and slides up and down, and the two limit seats limit the outer convex slider.

[0040] In one embodiment of the present invention, a reset cylinder 16 is provided outside the L-shaped slider, and a piston shaft 17 of the reset cylinder is connected to the moving section of the L-shaped slider. A tightening nut 18 and a connecting nut 19 are provided on the piston shaft of the reset cylinder, and a clamping gland 20 is provided on the end face of the moving section. The piston shaft passes through the clamping gland, and the head of the connecting nut is fixed between the clamping gland and the end face of the moving section, so as to realize the connection between the reset cylinder and the L-shaped slider.

[0041] In one embodiment of the present invention, a shaping machine early demoulding method comprises the following steps:

[0042] (1) After the product is shaped, Figure 2 As shown in the middle left state diagram, when the upper punch, the demoulding rod, and the demoulding rod nut are at the bottom dead center, the bottom of the pressure section of the L-shaped slider contacts the upper end surface of the demoulding rod nut, the piston shaft of the reset cylinder is in an extended state, and the lowest point of the fork rod inclined surface contacts the cylindrical surface of the rolling column;

[0043] (2) Upward return stroke:

[0044] First, the demoulding rod nut drives the floating plate to rise through the L-shaped slider, and the punch starts to lift the product upward in the middle mold cavity;

[0045] Next, the top of the fork rod contacts the bottom of the fixed ejector rod. Under the force of the fixed ejector rod, the fork rod slides downward under pressure while applying pressure to the rolling column through the bottom inclined surface, so that the L-shaped slider overcomes the resistance of the reset cylinder piston shaft and moves horizontally away from the demoulding rod until the highest point of the fork rod inclined surface contacts the cylindrical surface of the rolling column.

[0046] At this time, if Figure 2 As shown in the state diagram on the right side, the piston shaft of the reset cylinder is in a retracted state, the L-shaped slider is in an "out" state, and the distance between the pressure section of the L-shaped slider and the demoulding rod is sufficient for the demoulding rod nut to pass upward. At the same time, the product is ejected from the middle mold cavity in advance to proceed to the next process;

[0047] Finally, the upstroke continues to return upward until it is at the top dead center position;

[0048] (3) After completing the next shaping action, when the upper punch is at the bottom dead center again, the piston shaft of the reset cylinder extends outward to reset, pushing the L-shaped slider to move toward the demolding rod. The bottom of the pressure section of the L-shaped slider contacts the upper end surface of the demolding rod nut, and the L-shaped slider is in the "forward" state. At the same time, the fork rod slides upward and resets under the push of the rolling column, and the lowest point of the fork rod inclined surface contacts the cylindrical surface of the rolling column.

[0049] The shaping machine does not have an early demoulding mechanism, such as Figure 1 As shown, the demoulding rod nut will not contact the floating plate until the demoulding rod moves upward 100mm, and the floating plate and the punch will be stretched upward to eject the product, so that there will be an empty stroke of 100mm.

[0050] After adding the early demoulding mechanism of the present invention, the crankshaft is in a certain angle state after the pressurization is completed by 180°:

[0051] like Figure 2 As shown in the figure on the left side of the middle, in this state, the demoulding rod nut contacts the L-shaped slider, and the product is demoulded when the upper punch returns upward; during the demoulding process, when the fork rod on the floating plate contacts the fixed ejector rod, the L-shaped slider slowly opens outwards, and the floating plate is demoulded upward all the time.

[0052] like Figure 2As shown in the state diagram on the right side of the middle, the floating plate completes demoulding to the demoulding position state (taking the demoulding distance of 40mm as an example), the floating plate moves upward 40mm, and the demoulding is completed. At this time, the fork rod fully opens the L-shaped slider, and the L-shaped slider is separated from the demoulding rod nut; thereafter, the demoulding rod continues to move upward to complete the remaining 100mm fixed stroke, so that the demoulding is completed after the upper punch moves 40mm, and it is not necessary to move to 100mm before starting the demoulding, thus realizing early demoulding. Note: In this way, the upper position of the floating plate is a fixed position (i.e., the demoulding position), and the specific height of the floating plate is adjusted by adjusting the relative position of the demoulding rod nut and the floating plate.

Claims

1. A pre-demolding mechanism for a shaping machine, comprising an upper punch, a middle template, and a floating plate connected to a lower punch, wherein a punch is provided on the top of the floating plate at a position corresponding to the mold cavity of the middle template, and a demoulding rod is fixed to the upper punch, wherein the demoulding rod passes through the middle template and the floating plate in sequence, and a demoulding rod nut is connected to the lower part of the demoulding rod; Its characteristic is that include: An L-shaped slider and a slider driving assembly; the L-shaped slider comprises a horizontal moving section and a vertical pressure section, the top of the moving section is slidably assembled with the bottom of the floating plate, the bottom of the pressure section is located above the demoulding rod nut, and the distance between the pressure section and the demoulding rod is less than the wall thickness of the demoulding rod nut; When the upper punch returns upward, the demoulding rod nut contacts the bottom of the pressure section of the L-shaped slider, driving the floating plate to rise and the punch ejects the product in advance. At the same time, under the action of the slider drive assembly, the L-shaped slider moves horizontally away from the demoulding rod nut, ensuring space for the upper punch to continue its upward return.

2. The early demoulding mechanism of a shaping machine according to claim 1 is characterized in that: The slider driving assembly comprises: a fixed ejector rod, a fork rod and a rolling column; the fixed ejector rod is installed at the bottom of the middle template, the fork rod is located directly below the fixed ejector rod, the floating plate is provided with a sliding cavity for the fork rod to move up and down, and the fork rod is slidably assembled in the sliding cavity; The bottom of the fork rod is provided with an inclined surface, and the lowest point of the inclined surface is close to the demoulding rod; the rolling column is rotatably assembled in the moving section cavity of the L-shaped slider, and its cylindrical surface contacts the inclined surface of the fork rod.

3. The early demoulding mechanism of a shaping machine according to claim 2 is characterized in that: The inclined surface is inclined at 45°.

4. The early demoulding mechanism of a shaping machine according to claim 2 is characterized in that: The upper and lower openings of the sliding cavity are respectively provided with limit seats, and the outer circumferential surface of the fork rod is provided with an outer convex sliding block; the outer diameter of the outer convex sliding block matches the inner diameter of the sliding cavity and is larger than the aperture of the center holes of the two limit seats.

5. The early demoulding mechanism of a shaping machine according to claim 2 is characterized in that: A reset cylinder is also provided, and the piston shaft of the reset cylinder is connected to the moving section of the L-shaped sliding block.

6. The early demoulding mechanism of a shaping machine according to claim 5 is characterized in that: A connecting nut is arranged on the piston shaft of the reset cylinder, a clamping gland is arranged on the end face of the moving section, the piston shaft passes through the clamping gland, and the head of the connecting nut is located between the clamping gland and the end face of the moving section.

7. The early demoulding mechanism of a shaping machine according to claim 1 is characterized in that: The pressure-bearing section of the L-shaped sliding block is a concave arc surface on the side close to the demoulding rod.

8. The demoulding method of the early demoulding mechanism of a shaping machine according to claim 5, characterized in that: The following steps are involved: (1) After the product is shaped, when the upper punch is at the bottom dead center, the bottom of the pressure section of the L-shaped slider contacts the upper end surface of the demolding rod nut, the lowest point of the fork rod inclined surface contacts the cylindrical surface of the rolling column, and the piston shaft of the reset cylinder is in an extended state; (2) Upward return stroke: First, the demoulding rod nut rises with the upper punch, driving the floating plate to rise through the L-shaped slider, and the punch begins to lift the product upward in the middle mold cavity; Next, the top of the fork rod contacts the bottom of the fixed ejector rod. Under the force of the fixed ejector rod, the fork rod slides downward under pressure while applying pressure to the rolling column through the bottom inclined surface, so that the L-shaped slider overcomes the resistance of the reset cylinder piston shaft and moves horizontally away from the demoulding rod until the highest point of the fork rod inclined surface contacts the cylindrical surface of the rolling column. At this time, the piston shaft of the reset cylinder is in a retracted state, and the distance between the pressure section of the L-shaped slider and the demoulding rod is sufficient for the demoulding rod nut to pass upward, and at the same time, the product is ejected from the middle mold cavity in advance to proceed to the next process; Finally, the upstroke continues to return upward until it is at the top dead center position; (3) After completing the next shaping action, when the upper punch is at the bottom dead center again, the piston shaft of the reset cylinder extends outward, pushing the L-shaped slider to move toward the demolding rod. The bottom of the pressure section of the L-shaped slider contacts the upper end surface of the demolding rod nut, and the L-shaped slider completes the reset.

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