A demoulding structure used in automated precision forging automobile wheel hub bearing production line

Abstract

The present invention provides a demoulding structure applied to an automated precision forging automobile wheel hub bearing production line, comprising a lower die seat, a demoulding insert, a push rod and a screw rod, wherein a mold cavity is arranged in the lower die seat, the demoulding insert comprises an upper boss, a middle disc and a lower slider, the lower slider comprises two sliders, and an oblong hole is provided on the slider; a central channel is arranged at the bottom of the lower die seat, two slideways are arranged in the lower die seat, the two sliders extend into the two slideways, the upper boss extends into the inner hole at the lower part of the parting surface of the wheel hub bearing forging, the middle disc carries the wheel hub bearing forging, the upper end of the push rod penetrates into the central channel and abuts against the middle disc, two threaded holes are provided in the lower die seat, a screw rod is matched in each threaded hole, and the free end of each screw rod penetrates into the lower die seat and extends out of the oblong hole on the corresponding slider to limit the demoulding insert. The present invention avoids the problem that the robot cannot accurately clamp due to the tilt when the forging is ejected, ensures the stable demoulding of the forging, and improves the production line efficiency.

Description

Technical Field

[0001] The invention belongs to the technical field of forging demoulding structures, and in particular relates to a demoulding structure applied to an automated precision forging automobile wheel hub bearing production line. Background Art

[0002] Forgings are basic parts for various manufacturing industries and are widely used in the automotive, aerospace, shipbuilding and other industrial fields. Precision forgings refer to parts that require only a small amount of processing or no processing after forming and can be used as mechanical components, that is, blanks that are close to the shape and size requirements of the parts.

[0003] Precision forging forming technology is an advanced manufacturing technology that has been gradually improved and developed on the basis of ordinary forging forming processes. It is an application technology that integrates multidisciplinary high-tech technologies such as new materials, new energy, information technology, and computer technology. It has the advantages of high efficiency, energy saving, material saving, high precision, light weight, and low cost. With the popularization and application of big data analysis, machine learning, and robots, the forging industry is also developing in the direction of automation, networking, and intelligence. Using robots to replace workers to complete the grasping and flipping of forgings in a high-temperature environment is conducive to stabilizing and improving the quality and performance of forgings, and changing the extensive development model of the forging industry. However, due to the insufficient intelligence of the robot, it is impossible to make corresponding adjustments based on the problems that arise in the production line, especially when grasping precision forgings. Under normal operation of the production line, the forgings are ejected by the lower die ejection mechanism. Both manual clamping and robot clamping require the forgings to be completely demolded, that is, the ejection mechanism is required to eject the forgings to a sufficient height. At this time, the robot will clamp the flash part of the hub bearing, such as Figure 1 Conventional ejector mechanisms usually adopt the form of ejector rods, which exert force on the bottom surface of the forging to demold the forging. However, due to the vibration during demolding, this method usually cannot ensure smooth demolding of the forging. At this time, the forging will tilt as shown in the figure. Figure 2 As shown, this will cause the robot to be unable to clamp correctly. Manual clamping of forgings can be adjusted according to the real-time position of the forgings after demolding, while robot clamping of forgings requires the position of the forgings to be fixed after demolding. Once the forgings tilt after ejection and demolding, the robot will fail to grasp them. At this time, the automated production line can only be stopped urgently and resumed after manual processing. Therefore, how to ensure the smooth ejection of forgings is the key to further improving the efficiency of the production line. Summary of the invention

[0004] In view of this, the present invention aims to propose a demolding structure applied to an automated precision forged automobile wheel hub bearing production line to solve the problem of unstable demolding of forgings in the automated forged automobile wheel hub bearing production line. During the ejection process of the forgings, the ejector rod pushes the demolding insert to carry the forgings, thereby avoiding the situation where the robot cannot clamp due to the tilt of the forgings, thereby improving the production line efficiency.

[0005] To achieve the above object, the technical solution of the present invention is achieved as follows:

[0006] A demoulding structure used in an automated precision forging automobile wheel hub bearing production line comprises a lower die seat, a demoulding insert, a push rod and a screw, wherein a die cavity for accommodating a wheel hub bearing forging is arranged in the lower die seat, the demoulding insert is used to carry the wheel hub bearing forging, the demoulding insert comprises an upper boss, a middle disc and a lower slider in sequence from top to bottom, the upper boss is fixed at the center of the middle disc, the lower slider comprises two sliders arranged symmetrically, and an oblong hole is provided on each slider;

[0007] A central channel for accommodating the ejector rod is provided at the bottom center of the lower die base, and two slideways are provided in the lower die base, each slideway accommodating a slider, and the two slideways are symmetrically arranged on the left and right sides of the central channel;

[0008] The two slide blocks of the demolding insert extend into the two slideways of the lower die seat correspondingly, the upper boss of the demolding insert extends into the inner hole at the lower part of the parting surface of the hub bearing forging, the upper end face of the middle disk of the demolding insert bears the lower end face of the hub bearing forging, the upper end of the push rod penetrates into the central channel and rests against the lower end face of the middle disk, two threaded holes are opened in the lower die seat, each threaded hole is fitted with a screw, and the free end of each screw penetrates into the lower die seat and extends out of the oblong hole on the corresponding slide block to limit the demolding insert.

[0009] Furthermore, the draft angle γ of the wheel hub bearing forging in the height direction below the parting surface is ≤2°.

[0010] Furthermore, the size of the upper boss is adapted to the size of the inner hole at the lower part of the parting surface of the hub bearing forging.

[0011] Furthermore, the thickness T2 of the middle disc of the demoulding insert is 10 to 30 mm, and the disc matching cone angle α is 30 to 60 degrees.

[0012] Furthermore, the width H2 of the bearing hub bearing forging of the middle disc of the demoulding insert is determined by formula (1):

[0013] H2=k1H1 (1)

[0014] In formula (1), the contact coefficient k1 ranges from 0.3 to 0.8, and H1 is the width of the ring at the inner hole below the parting surface of the hub bearing forging.

[0015] Furthermore, the straight line length T3 of the oblong hole on the slider of the demoulding insert (4) and the arc radius R1 of the oblong hole are determined by formula (2):

[0016]

[0017] In formula (2), the value range of height coefficient k2 is 0.25-0.5, the value range of arc coefficient k3 is 0.2-0.4, and T1 is the height below the parting surface of the wheel hub bearing forging.

[0018] Furthermore, the slider is a cylindrical structure, and an oblong hole is opened in the central area of ​​the side of the cylindrical structure. The distance T4 between the bottom end of the straight line segment of the oblong hole on the slider of the demoulding insert (4) and the bottom of the slider, the total length T5 of the slider, and the diameter D1 of the slider are determined by formula (3):

[0019]

[0020] In formula (3), R1 is the arc segment radius of the oblong hole, the offset height Δh ranges from 10 to 30 mm, T3 is the straight segment length of the oblong hole on the slider, and the width coefficient k4 ranges from 3 to 5.

[0021] Furthermore, the length T6 of the slideway on the lower die base (2) is determined by formula (4):

[0022] T6=T5+Δt (4)

[0023] In formula (4), T5 is the total length of the slider, and the gap value Δt ranges from 5 to 10 mm.

[0024] Compared with the prior art, the demoulding structure for an automated precision forged automobile wheel hub bearing production line according to the present invention has the following advantages:

[0025] When the wheel hub bearing forging is formed and the upper die returns, the present application uses the ejector pin to eject the demolding insert, and the demolding insert carries the forging to achieve stable demolding. Since the demolding insert has a large contact area with the inner hole and the bottom of the forging, and is constrained by the slideway of the lower die seat, the forging will not be ejected unstably due to vibration, thus avoiding the situation where the production line has to stop urgently because the robot cannot clamp the upper forging; the demolding insert is limited by the screw and will not be taken out together with the forging, thereby avoiding the situation where the forging sticks to the insert. After the forging is taken out, the slider of the demolding insert will move downward along the slideway on the lower die seat with the ejector pin and return to the initial position of matching with the lower die seat, and there will be no incompatibility. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the accompanying drawings:

[0027] Figure 1 A schematic diagram of a robot clamping a wheel hub forging flash in the prior art;

[0028] Figure 2 To utilize the existing demoulding mechanism, the wheel hub forging tilts and the robot cannot clamp the schematic diagram;

[0029] Figure 3 This is a schematic diagram of the basic shape of a wheel hub bearing forging with punching and skinning in Example 1;

[0030] Figure 4 This is a front view of the demoulding structure of the hub bearing forging of Example 1;

[0031] Figure 5 It is a left view of the demoulding structure of the hub bearing forging of Example 1;

[0032] Figure 6 It is a schematic diagram of the structure of the demoulding insert of the wheel hub bearing forging;

[0033] Figure 7 It is the front view of the demoulding insert of the wheel hub bearing forging;

[0034] Figure 8 This is a schematic diagram of the lower die seat of the wheel hub bearing forging of Example 1;

[0035] Fig. 9 This is a schematic diagram of ejection of a hub bearing forging in Example 1;

[0036] Fig.10 This is a schematic diagram of the basic shape of a wheel hub bearing forging with punching and skinning in Example 2;

[0037] Fig.11 This is the front view of the demoulding structure of the wheel hub bearing forging in Example 2.

[0038] Description of reference numerals:

[0039] 1. Upper die; 2. Lower die seat; 3. Wheel hub bearing forging; 4. Demolding insert; 5. Ejector rod; 6. Screw; 7. Upper boss; 8. Middle disc; 9. Lower slider; 10. Robot clamping fixture; 11. Oblong hole; 12. Slide; 13. Cavity; 14. Center channel. DETAILED DESCRIPTION

[0040] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

[0041] The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments.

[0042] like Figure 3-Figure 11As shown, a demoulding structure applied to an automated precision forging automobile wheel hub bearing production line comprises a lower die base 2, a demoulding insert 4, a push rod 5 and a screw 6. The lower die base 2 is provided with a die cavity 13 for accommodating a wheel hub bearing forging 3. The demoulding insert 4 is used to carry the wheel hub bearing forging 3. The demoulding insert 4 comprises an upper boss 7, a middle disc 8 and a lower slider 9 from top to bottom. The upper boss 7 is fixed at the center of the middle disc 8. The lower slider 9 comprises two sliders arranged symmetrically, and an oblong hole 11 is provided on each slider.

[0043] A central channel 14 for accommodating the ejector rod 5 is provided at the bottom center of the lower die base 2. Two slideways 12 are provided in the lower die base. Each slideway 12 accommodates a slider. The two slideways are symmetrically arranged on the left and right sides of the central channel 14.

[0044] The two slide blocks of the demoulding insert 4 extend into the two slideways 12 of the lower die seat 2 respectively, the upper boss 7 of the demoulding insert 4 extends into the inner hole at the lower part of the parting surface of the hub bearing forging, the upper end surface of the middle disk 8 of the demoulding insert 4 bears the lower end surface of the hub bearing forging 3, the upper end of the ejector rod 5 penetrates into the central channel 14 and rests on the lower end surface of the middle disk 8, two threaded holes are opened in the lower die seat 2, each threaded hole is matched with a screw rod 6, and the free end of each screw rod 6 penetrates into the lower die seat and extends out of the oblong hole 11 on the corresponding slide block to limit the demoulding insert 4; the ejector rod is connected to other power equipment externally and can move independently.

[0045] The draft angle γ in the height direction below the parting surface of the wheel hub bearing forging is ≤2°. The size of the upper boss 7 is adapted to the size of the inner hole below the parting surface of the wheel hub bearing forging.

[0046] The middle disk of the demoulding insert is a truncated cone structure. The thickness T2 of the middle disk 8 of the demoulding insert 4 is 10-30 mm, and the disk matching cone angle α is 30-60°. The disk matching cone angle is the cone angle of the imaginary cone where the truncated cone structure is located.

[0047] The width H2 of the central disc 8 of the demoulding insert 4 that supports the hub bearing forging 3 is determined by formula (1):

[0048] H2=k1H1 (1)

[0049] In formula (1), the contact coefficient k1 ranges from 0.3 to 0.8, and H1 is the width of the ring at the inner hole below the parting surface of the hub bearing forging.

[0050] The straight line length T3 of the oblong hole 11 on the slider of the demoulding insert 4 and the arc radius R1 of the oblong hole 11 are determined by formula (2):

[0051]

[0052] In formula (2), the value range of height coefficient k2 is 0.25-0.5, the value range of arc coefficient k3 is 0.2-0.4, and T1 is the height below the parting surface of the wheel hub bearing forging.

[0053] The slider is a cylindrical structure, and an oblong hole is opened in the central area of ​​the side of the cylindrical structure. The distance T4 between the bottom end of the straight line segment of the oblong hole on the slider of the demoulding insert 4 and the bottom of the slider, the total length T5 of the slider, and the diameter D1 of the slider are determined by formula (3):

[0054]

[0055] In formula (3), R1 is the arc segment radius of the oblong hole, the offset height Δh ranges from 10 to 30 mm, T3 is the straight segment length of the oblong hole on the slider, and the width coefficient k4 ranges from 3 to 5.

[0056] The length T6 of the slideway 12 on the lower die base 2 is determined by formula (4):

[0057] T6=T5+Δt (4)

[0058] In formula (4), T5 is the total length of the slider of the demoulding insert 4, and the gap value Δt ranges from 5 to 10 mm.

[0059] Two specific embodiments are given below:

[0060] Example 1: A certain type of automobile wheel hub bearing such as Figure 3 As shown in the figure, the height T1 below the forging parting surface is 56mm, the draft angle γ is 2°, and the width H1 of the ring at the inner hole below the forging parting surface is 13mm. The front view and left view of the designed forging demoulding structure are shown in the figure. Figure 4 and Figure 5 As shown, 1 is an upper die, 2 is a lower die seat, 3 is a wheel hub bearing forging with flash and punching, 4 is a demoulding insert, 5 is a push rod, 6 is a screw, 7 is an upper boss, 8 is a middle disc, and 9 is a lower slider;

[0061] The size of the upper boss 7 is the same as the size of the inner hole below the forging parting surface. The thickness T2 of the middle disk 8 is 15 mm, and the disk matching cone angle α is 45°. The width H2 of the middle disk 8 of the demoulding insert 4 that supports the hub bearing forging 3 is determined by formula (1). The contact coefficient k1 is 0.4, and H2 is calculated to be 5.2 mm.

[0062] The oblong hole on the lower slider of the demoulding insert is used to cooperate with the screw. The straight section length T3 of the oblong hole 11 on the slider of the demoulding insert 4 and the arc section radius R1 of the oblong hole 11 are determined by formula (2), where the height coefficient k2 is 0.34, the arc coefficient k3 ranges from 0.21, T3 is calculated to be 19 mm, and R1 is calculated to be 4 mm;

[0063] The distance T4 between the bottom end of the straight line segment of the oblong hole on the slider of the demoulding insert 4 and the bottom of the slider, the total length T5 of the slider and the diameter D1 of the slider are determined by formula (3), where the offset height Δh is 10 mm, the width coefficient k4 is 3, T4 is calculated to be 14 mm, T5 is calculated to be 47 mm, and D1 is calculated to be 12 mm;

[0064] The schematic diagram of the lower die base is as follows: Figure 8 As shown, there are slideways and threaded holes on it, which are convenient for cooperation with the demoulding insert and the screw. The length T6 of the slideway 12 on the lower die base 2 is determined by formula (4), the gap value Δt is 5mm, and T6 is calculated to be 52mm;

[0065] Fig. 9 It is a schematic diagram of the ejection of the hub bearing forging. When the hub bearing forging 3 is formed and the upper die 1 returns, the ejector rod 5 ejects the demolding insert 4, causing it to move upward with the forging. Since the demolding insert 4 has a certain contact area with the inner hole and the bottom of the forging, and is constrained by the slideway of the lower die seat, the forging can be ejected smoothly without tilting; the demolding insert 4 is limited by the screw 6 and will not be taken out together with the forging, thereby avoiding the situation where the forging sticks to the insert. After the forging is taken out, the slider of the demolding insert 4 will move downward along the slideway on the lower die seat 2 with the ejector rod 5 and return to the initial position of matching with the lower die seat, and there will be no incompatibility.

[0066] Example 2: A certain type of automobile wheel hub bearing such as Fig.10 As shown in the figure, the height T1 below the forging parting surface is 90mm, the draft angle γ is 0.7°, and the width H1 of the ring at the inner hole below the forging parting surface is 20mm; the main view of the designed forging demoulding structure is shown in the figure Fig.11 As shown, the size of the upper boss is the same as the size of the inner hole below the forging parting surface, the thickness T2 of the middle disc is 25 mm, the disc matching cone angle α is 60°, and the width H2 of the middle disc 8 of the demoulding insert 4 that carries the hub bearing forging 3 is determined by formula (1), where the contact coefficient k1 is 0.7, and H2 is calculated to be 14 mm;

[0067] The hole on the lower slider of the demoulding insert 4 is used to cooperate with the screw. The straight section length T3 of the oblong hole 11 on the slider of the demoulding insert 4 and the arc section radius R1 of the oblong hole 11 are determined by formula (2), where the height coefficient k2 is 0.4, the arc coefficient k3 is in the range of 0.36, T3 is calculated to be 36 mm, and R1 is calculated to be 13 mm;

[0068] The distance T4 between the bottom end of the straight line segment of the oblong hole on the slider of the demoulding insert 4 and the bottom of the slider, the total length T5 of the slider and the diameter D1 of the slider are determined by formula (3), where the offset height Δh is 15 mm, the width coefficient k4 is 4, T4 is calculated to be 28 mm, T5 is calculated to be 92 mm, and D1 is calculated to be 52 mm;

[0069] The length T6 of the slideway 12 on the lower die base 2 is determined by formula (4), the gap value Δt is taken as 8 mm, and T6 is calculated to be 100 mm.

[0070] The two specific embodiments designed in this application can fully ensure that the forging will not tilt when demolding. This application solves the problem that the forging cannot be ejected smoothly due to vibration during the automated forging process, so that the robot cannot accurately grasp it. The present invention includes a lower die base, a demolding insert, a push rod and a screw. The demolding insert is composed of an upper boss, a middle disc and a lower slider. The slider cooperates with the lower die base to slide up and down. The screw is screwed into the lower die base to limit the demolding insert during ejection. During the ejection process of the forging, the push rod pushes the demolding insert to carry the forging, thereby avoiding the situation where the robot cannot clamp the forging due to tilting, thereby improving the efficiency of the production line.

[0071] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A demoulding structure used in an automated precision forged automobile wheel hub bearing production line, characterized in that: The present invention comprises a lower die base (2), a demoulding insert (4), a push rod (5) and a screw (6); the lower die base (2) is provided with a die cavity (13) for accommodating a wheel hub bearing forging (3); the demoulding insert (4) is used to carry the wheel hub bearing forging (3); the demoulding insert (4) comprises an upper boss (7), a middle disc (8) and a lower slider (9) from top to bottom; the upper boss (7) is fixed at the center of the middle disc (8); the lower slider (9) comprises two sliders which are symmetrically arranged, and an oblong hole (11) is provided on each slider; A central channel (14) for accommodating a push rod (5) is provided at the bottom center of the lower die base (2), and two slideways (12) are provided in the lower die base, each slideway (12) accommodating a slider, and the two slideways are symmetrically arranged on the left and right sides of the central channel (14); The two slide blocks of the demoulding insert (4) extend into the two slideways (12) of the lower die seat (2) correspondingly, the upper boss (7) of the demoulding insert (4) extends into the inner hole at the lower part of the parting surface of the wheel hub bearing forging, the upper end surface of the middle disk (8) of the demoulding insert (4) bears the lower end surface of the wheel hub bearing forging (3), the upper end of the push rod (5) penetrates into the central channel (14) and abuts against the lower end surface of the middle disk (8), two threaded holes are opened in the lower die seat (2), each threaded hole is matched with a screw rod (6), and the free end of each screw rod (6) penetrates into the lower die seat and extends out of the oblong hole (11) on the corresponding slide block to limit the demoulding insert (4); The draft angle of the wheel hub bearing forging in the height direction below the parting surface is γ≤2°; The size of the upper boss (7) is adapted to the size of the inner hole at the lower part of the parting surface of the wheel hub bearing forging; The thickness T2 of the middle disc (8) of the demoulding insert (4) is 10 to 30 mm, and the disc matching cone angle α is 30 to 60°; The width H2 of the central disc (8) of the demoulding insert (4) that supports the hub bearing forging (3) is determined by formula (1): H2=k1H1 (1) In formula (1), the contact coefficient k1 ranges from 0.3 to 0.8, and H1 is the width of the ring at the inner hole below the parting surface of the hub bearing forging.

2. The demoulding structure used in the automated precision forging automobile wheel hub bearing production line according to claim 1 is characterized in that: The straight line length T3 of the oblong hole (11) on the slider of the demoulding insert (4) and the arc radius R1 of the oblong hole (11) are determined by formula (2): In formula (2), the value range of height coefficient k2 is 0.25-0.5, the value range of arc coefficient k3 is 0.2-0.4, and T1 is the height below the parting surface of the wheel hub bearing forging.

3. The demoulding structure used in the automated precision forging automobile wheel hub bearing production line according to claim 2 is characterized in that: The slider is a cylindrical structure, with an oblong hole in the central area of ​​the cylindrical side. The distance T4 between the bottom end of the straight line segment of the oblong hole on the slider of the demoulding insert (4) and the bottom of the slider, the total length T5 of the slider and the diameter D1 of the slider are determined by formula (3): In formula (3), R1 is the arc segment radius of the oblong hole, the offset height Δh ranges from 10 to 30 mm, T3 is the straight segment length of the oblong hole on the slider, and the width coefficient k4 ranges from 3 to 5.

4. The demoulding structure used in the automated precision forging automobile wheel hub bearing production line according to claim 3 is characterized in that: The length T6 of the slideway (12) on the lower die base (2) is determined by formula (4): T6=T5+Δt (4) In formula (4), T5 is the total length of the slider, and the gap value Δt ranges from 5 to 10 mm.

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