JP2004243670A - Contact surface protecting apparatus, contact surface protecting method, mold thickness adjusting apparatus, and molding machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To suppress the occurrence of scuffing between a fastening element and a spinning element and to reduce a repairing cost. <P>SOLUTION: An apparatus has the fastening element having a first surface, the spinning element which is installed rotatably in relation to the fastening element and has a second surface facing the first surface, an intermediate element which is installed between the fastening element and the spinning element and has a third surface contacting the first surface and a fourth surface contacting the second surface, and a pushing member which pushes the spinning element to the fastening element through the intermediate element. Since the first and third surfaces are formed to be different in hardness, the occurrence of scuffing between the first and third surfaces can be prevented. Since there is no need to replace the fastening element, the cost for repairing a contact surface protecting apparatus can be reduced. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a contact surface protection device, a contact surface protection method, a mold thickness adjusting device, and a molding machine.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, in a molding machine, for example, an injection molding machine, a resin heated and melted in a heating cylinder is injected to fill a cavity space of a mold apparatus, and the resin is cooled in the cavity space. Then, the molded product is molded by solidification.
[0003]
For this purpose, the mold apparatus is composed of a fixed mold and a movable mold, and the movable mold is moved forward and backward by a mold clamping device, and is brought into and out of contact with the fixed mold to open and close the mold, that is, close the mold. The mold can be clamped and opened. The mold clamping device includes, for example, a fixed platen for holding a fixed mold, a movable platen for holding a movable mold, and a toggle mechanism for moving the movable platen forward and backward. The toggle mechanism includes a toggle support as a fixed element. It is operated by driving a mold-clamping motor attached to the motor.
[0004]
By the way, in the injection molding machine, the fixed platen and the toggle support are arranged at predetermined positions in the frame. However, the thickness of the mold device, that is, the thickness of the mold device is different from that of the mold device. Each type is different. Therefore, a mold thickness adjusting device is provided, and every time the mold device is replaced, the distance between the toggle support and the fixed platen is changed by the mold thickness adjusting device to adjust the mold thickness.
[0005]
And, since the fixed platen and the toggle support are connected by a plurality of, for example, four tie bars and are relatively positioned, when adjusting the mold thickness, the toggle support is moved along the tie bar. Like that.
[0006]
In this case, it is necessary to move the toggle support equally with respect to the four tie bars. Therefore, in the mold thickness adjusting device, a screw portion is formed on an outer peripheral surface of a portion of the four tie bars that penetrates the toggle support, and each of the screw portions is screwed together to form four rotating elements. An adjusting nut is attached to the toggle support, and the adjusting nut is evenly rotated to move the toggle support (for example, see Patent Document 1).
[0007]
FIG. 2 is a sectional view showing a main part of a conventional mold thickness adjusting device.
[0008]
In the drawing, reference numeral 51 denotes a toggle support that supports a toggle mechanism and that a toggle lever 41 that constitutes a part of the toggle mechanism is swingably supported. The toggle support 51 is movable on a frame (not shown). Attached to. Reference numeral 52 denotes a plurality, for example, four tie bars (one of the tie bars 52 is shown in the figure) provided between a fixed platen (not shown) fixed to the frame and the toggle support 51. )). The front end (right end in the figure) of the tie bar 52 is fixed to the fixed platen.
[0009]
The toggle support 51 is formed with a stepped cylindrical tie bar through hole 54 corresponding to each tie bar 52, and the rear end (left end in the figure) of each tie bar 52 passes through each tie bar through hole 54. Let me do. At a substantially center of a rear end surface (left end surface in the figure) S1 of the toggle support 51, a mold clamping motor (not shown) for operating the toggle mechanism is provided.
[0010]
A screw portion 53 is formed on an outer peripheral surface of a rear end portion (left end portion in the figure) of each of the tie bars 52, and the screw portion 53 and an adjustment nut 55 rotatably disposed in the tie bar through hole 54 are screwed. Be combined. For this purpose, a large-diameter large-diameter portion 57 and a small-diameter small-diameter portion 58 are formed adjacent to the large-diameter portion 57 at the rear end of the tie-bar through-hole 54. A flange portion 59 having a diameter corresponding to the large diameter portion 57 is formed adjacent to the flange portion 59 to form a sleeve portion 62 having a diameter corresponding to the small diameter portion 58. The flange portion 59 is fitted into the large diameter portion 57, and the sleeve portion 62 is fitted into the small diameter portion 58.
[0011]
Then, an annular pressing plate 56 is attached to the toggle support 51 by a fixing member such as a bolt (not shown) so that the adjusting nut 55 does not come out of the tie bar through hole 54, and the tie bar through hole 54 is closed. Go. In this way, the adjustment nut 55 is rotatably mounted in the tie bar through-hole 54 and immovable with respect to the toggle support 51.
[0012]
A planetary gear 61 is fixed to the rear end of each of the adjustment nuts 55 by a fixing member such as a bolt (not shown). At approximately the center of the rear end face S1, a sun gear (not shown) is provided at the center of each of the planetary gears 61, and meshes with the respective planetary gears 61.
[0013]
When a mold thickness adjusting motor (not shown) is driven, the sun gear is rotated, and accordingly, each planetary gear 61 is rotated, and the adjustment nut 55 is rotated. In addition, the tie bar 52 is fixed to the fixed platen at the front end and is not rotated. Therefore, the adjustment nut 55 is moved in the axial direction with respect to the tie bar 52 by rotating. As a result, the toggle support 51 is moved in the axial direction along the tie bar 52, and the mold thickness is adjusted.
[0014]
[Patent Document 1]
JP-A-8-187756
[0015]
[Problems to be solved by the invention]
However, in the conventional mold thickness adjusting device, when the mold clamping device repeatedly performs mold clamping, the toggle support 51 and the adjusting nut 55 are both formed of the same material, for example, cast iron. And the adjustment nut 55 are in contact with a high pressure, for example, between the seating surface S2 forming the bottom surface of the large-diameter portion 57 and the front surface S3 contacting the seating surface S2 in the flange portion 59. Will occur.
[0016]
That is, at the time of mold clamping, when a mold clamping force is generated by the mold clamping device, the toggle support 51 is pushed rearward (to the left in the drawing) by the toggle mechanism, and pulls the tie bar 52. Accordingly, a high surface pressure is generated between the seat surface S2 and the front surface S3 corresponding to the mold clamping force. Therefore, a lubricant such as oil or grease is supplied between the seating surface S2 and the front surface S3 to form a lubricating film to perform lubrication. When a high surface pressure is applied for a long period of time, the lubricating film may be broken.
[0017]
Further, when the adjustment nut 55 is rotated by driving the mold thickness adjustment motor while the mold thickness adjustment is being performed, the toggle support 51 can be moved forward and backward (moved in the left-right direction in the drawing). However, when the toggle support 51 (moving rightward in the figure) is advanced, it is necessary to rotate the adjustment nut 55 while applying a force required to advance the toggle support 51 to the seat surface S2. Therefore, if the lubricating film is cut, galling occurs between the seat surface S2 and the front surface S3 due to friction between the seat surface S2 and the front surface S3.
[0018]
Then, when galling occurs between the seat surface S2 and the front surface S3, the toggle support 51 and the adjustment nut 55 need to be replaced, and the cost for repairing the mold thickness adjusting device increases. In addition, since mold thickness adjustment is not performed frequently, if the adjustment nut 55 is formed of a material such as brass (brass) in order to reduce the friction coefficient, it will not be worth the cost.
[0019]
The present invention solves the problems of the conventional mold thickness adjusting device, can suppress galling between the fixed element and the rotating element, and can reduce the cost for repair. An object of the present invention is to provide a contact surface protection device, a contact surface protection method, a mold thickness adjusting device, and a molding machine that can be used.
[0020]
[Means for Solving the Problems]
For this purpose, in the contact surface protection device according to the present invention, a fixing element having the first surface and a second surface rotatably disposed with respect to the fixing element and facing the first surface. And a third surface disposed between the fixed element and the rotating element, the third surface being in contact with the first surface, and the fourth surface being in contact with the second surface. It has an intermediate element and a pressing member for pressing the rotating element against the fixed element via the intermediate element.
[0021]
The first and third surfaces are formed to have different hardnesses.
[0022]
In another contact surface protection device of the present invention, a fixing element having a first surface and a second surface rotatably disposed with respect to the fixing element and facing the first surface are provided. A rotating element disposed between the stationary element and the rotating element, a third surface contacting the first surface, and a fourth surface contacting the second surface. An element and a pressing member for pressing the rotating element against the fixed element via the intermediate element.
[0023]
The second and fourth surfaces are formed with different hardnesses.
[0024]
In still another contact surface protection device of the present invention, any one of the surfaces is subjected to a surface treatment in order to make the hardness of each surface different.
[0025]
In still another contact surface protection device according to the present invention, the intermediate element is formed of a material having a lower hardness than the fixed element and the rotating element.
[0026]
In still another contact surface protection device according to the present invention, the intermediate element is formed of a self-lubricating material.
[0027]
In the method for protecting a contact surface according to the present invention, a fixing element having a first surface, a rotation member rotatably disposed with respect to the fixing element, and having a second surface facing the first surface. And an intermediate element disposed between the stationary element and the rotating element, the intermediate element having a third surface that contacts the first surface, and a fourth surface that contacts the second surface. Applied to contact surface protection devices.
[0028]
Then, the rotating element is pressed against the fixed element via the intermediate element, and the first and third surfaces are formed with different hardnesses.
[0029]
In another contact surface protecting method of the present invention, a fixing element having a first surface, a second surface rotatably disposed with respect to the fixing element and facing the first surface is provided. Rotating element, and an intermediate element disposed between the fixed element and the rotating element, the intermediate element including a third surface that contacts the first surface, and a fourth surface that contacts the second surface. It is applied to the contact surface protection device provided with
[0030]
Then, the rotating element is pressed against the fixed element via the intermediate element, and the second and fourth surfaces are formed with different hardnesses.
[0031]
A mold thickness adjusting device according to the present invention includes the contact surface protection device according to any one of claims 1 to 5.
[0032]
A molding machine according to the present invention includes the contact surface protection device according to any one of claims 1 to 5.
[0033]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In this case, an injection molding machine as a molding machine will be described, and a mold thickness adjusting device as a contact surface protection device including a toggle support, an adjusting nut, an annular body, and a tie bar will be described.
[0034]
FIG. 1 is a sectional view showing a main part of a mold thickness adjusting device according to an embodiment of the present invention, FIG. 3 is a front view showing a main part of an injection molding machine according to an embodiment of the present invention, and FIG. It is a side view which shows the principal part of the injection molding machine in a form.
[0035]
In the figure, 31 is a frame as a support base, 32 is a fixed platen as a fixed support member fixed to the frame 31, 11 is a predetermined distance between the fixed platen 32 and the frame 31, And a toggle support as a mold clamping mechanism supporting member. The toggle support 11 is formed of, for example, cast iron. The toggle support 11 forms a base plate.
[0036]
Reference numeral 12 denotes a plurality of, for example, four tie bars as a pressing member and a guide member provided between the fixed platen 32 and the toggle support 11 (in the figure, only two tie bars 12 are provided). The front end (the right end in FIG. 3) of each tie bar 12 is fixed to the fixed platen 32 by the fixing member 38.
[0037]
Reference numeral 35 denotes a movable platen as a movable support member that is disposed so as to be able to advance and retreat (move in the left-right direction in FIG. 3) along the tie bar 12 so as to face the fixed platen 32. Further, a fixed mold 34 as a first mold is mounted on a mold mounting surface 33 of the fixed platen 32 facing the movable platen 35, and a mold of the movable platen 35 facing the fixed platen 32. A movable mold 37 as a second mold is attached to the attachment surface 36. Note that a mold device is constituted by the fixed mold 34 and the movable mold 37.
[0038]
An ejector motor (not shown) serving as a drive unit for the ejector is attached to the rear surface (the left end surface in FIG. 3) of the movable platen 35, and the ejector pin (not shown) is advanced by driving the ejector motor. , Can protrude the molded product.
[0039]
A toggle mechanism 40 as a mold clamping mechanism is disposed between the movable platen 35 and the toggle support 11, and is provided substantially at the center of the rear end surface S1 of the toggle support 11 (the left end surface in FIGS. 1 and 3). A mold-clamping motor (not shown) is mounted as a mold-clamping drive unit. Therefore, the toggle mechanism 40 can be operated by driving the mold clamping motor to move the crosshead 45 as a moving member forward and backward. In the present embodiment, a mold-clamping motor is used as the mold-clamping drive unit, but a mold-clamping cylinder may be used instead of the mold-clamping motor.
[0040]
When the toggle mechanism 40 is operated by driving the mold clamping motor in the forward direction and moving the crosshead 45 forward (moving rightward in FIG. 3), the movable platen 35 is moved forward, The mold can be closed. Further, when the mold clamping motor is further driven in the forward direction, the toggle mechanism 40 generates a mold clamping force obtained by multiplying a propulsion force generated by the mold clamping motor by a toggle magnification. Therefore, mold clamping can be performed by the mold clamping force. Then, a cavity space is formed between the fixed mold 34 and the movable mold 37 as the mold is closed and clamped.
[0041]
At this time, molten resin as a molding material is injected from an injection nozzle of an injection device (not shown), and is filled in the cavity space. Then, when the resin is cooled and solidified, a molded article is formed.
[0042]
Next, when the mold clamping motor is driven in the reverse direction, the cross head 45 is moved backward (moves leftward in FIG. 3), and the toggle mechanism 40 is operated, the movable platen 35 is moved backward, The mold can be opened. In the present embodiment, the mold clamping force is generated by operating the toggle mechanism 40. However, the thrust generated by the mold clamping motor is generated without using the toggle mechanism 40. It can be transmitted to the movable platen 35 as the mold clamping force as it is.
[0043]
The toggle mechanism 40 includes a toggle lever 42 swingably supported by the crosshead 45, a toggle lever 41 swingably supported by the toggle support 11, and a movable platen 35. A toggle arm 43 supported swingably is provided, between the crosshead 45 and the toggle lever 42, between the toggle support 11 and the toggle lever 41, between the movable platen 35 and the toggle arm 43, and between the toggle lever 42 and the toggle lever 42. The link between the toggle lever 41 and the toggle lever 41 and the toggle arm 43 are linked.
[0044]
By the way, in the injection molding machine, the fixed platen 32 and the toggle support 11 are arranged at predetermined positions on the frame 31, but the mold thickness differs for each type of mold apparatus. . Therefore, a mold thickness adjusting device is provided, and every time the mold device is replaced, the distance between the toggle support 11 and the fixed platen 32 is changed by the mold thickness adjusting device to adjust the mold thickness. .
[0045]
And, since the fixed platen 32 and the toggle support 11 are connected by the tie bar 12 and are relatively positioned, in adjusting the mold thickness, the toggle support 11 is moved along the tie bar 12. I have.
[0046]
For this purpose, as shown in FIG. 1, a stepped cylindrical tie bar through hole 14 is formed in the toggle support 11 so as to correspond to each tie bar 12, and a rear end of each tie bar 12 (FIGS. 1 and 3). At the left end) is passed through each tie bar through hole 14.
[0047]
Further, since it is necessary to move the toggle support 11 evenly with respect to each tie bar 12, a screw is provided on the outer peripheral surface of the rear end (the left end in FIG. 1) of each tie bar 12 (the portion penetrating the toggle support 11). A portion 13 is formed, and each of the threaded portions 13 is screwed with each of the four stepped cylindrical adjusting nuts 15 as a rotating element and a mold thickness adjusting element to the toggle support 11 in the tie bar through hole 14. It is arranged to be rotatable. Therefore, the toggle support 11 can be evenly moved along each tie bar 12 by rotating the adjustment nut 15 evenly. The adjusting nut 15 is made of cast iron having high strength and toughness, such as ductile cast iron in which the shape, distribution, etc. of the graphite contained is changed.
[0048]
A large diameter portion 17 having a large diameter is formed at a rear end portion of the tie bar through hole 14, and a small diameter portion 18 having a small diameter is formed adjacent to a front end (right end in FIG. 1) of the large diameter portion 17. A flange portion 19 having a diameter corresponding to the large-diameter portion 17 and a sleeve portion 22 having a diameter corresponding to the small-diameter portion 18 are formed adjacent to the front end of the flange portion 19. The flange portion 19 is fitted into the large-diameter portion 17, and the sleeve portion 22 is fitted into the small-diameter portion 18. Therefore, the large-diameter portion 17, the small-diameter portion 18, the flange portion 19, and the sleeve portion 22 each have a circular cross section.
[0049]
Then, an annular pressing plate 16 is attached to the toggle support 11 by a fixing member such as a bolt (not shown) so that the adjusting nut 15 does not come out of the tie bar through hole 14, and closes the tie bar through hole 14. Therefore, the inner diameter of the pressing plate 16 is made smaller than the outer diameter of the flange portion 19. A boss 20 having a smaller diameter than the flange 19 and a larger diameter than the sleeve 22 is formed at the rear end of the adjusting nut 15 behind (to the left in FIG. 1) the flange 19. The boss portion 20 is disposed radially inward from the inner peripheral edge of the push plate 16.
[0050]
In this manner, the adjustment nut 15 is rotatably attached to the toggle support 11 in the tie bar through-hole 14 so as not to be movable.
[0051]
A planetary gear 21 is fixed to the rear end of each of the adjusting nuts 15 by a fixing member such as a bolt (not shown) so that their axes are aligned, and the adjusting nut 15 and the planetary gears 21 are integrally rotated. As shown in FIG. 4, a sun gear 23 is rotatably supported by a bearing (not shown) at the center of each of the planetary gears 21 at substantially the center of the rear end face S1, and meshes with each of the planetary gears 21. Let me do.
[0052]
A mold thickness adjusting motor 25 as a drive unit for adjusting the mold thickness is provided at a predetermined position on the outer peripheral edge of the sun gear 23 in the toggle support 11 via an attachment member (not shown). The mold thickness adjusting motor 25 includes, for example, a pulse motor, and a drive gear 26 is attached to an output shaft, and the drive gear 26 and the sun gear 23 are meshed.
[0053]
Therefore, when the mold thickness adjusting motor 25 is driven and the driving gear 26 is rotated, the sun gear 23 is rotated, and the planetary gear 21 and the adjusting nut 15 are further rotated.
[0054]
Since the tie bar 12 is fixed to the fixed platen 32 at the front end and is not rotated, the adjustment nut 15 is moved in the axial direction with respect to the tie bar 12 by rotating. As a result, the toggle support 11 is moved in the axial direction along the tie bar 12, and the mold thickness is adjusted.
[0055]
Since the diameter and the number of teeth of each of the planetary gears 21 are all equal, the rotational speeds of each of the planetary gears 21 and the adjustment nut 15 rotated by the rotation of the sun gear 23 are all equal. And the pitch of the screw of each adjustment nut 15 and the pitch of the screw formed in each screw part 13 are all equal. Therefore, the amount of movement of each of the adjustment nuts 15 with respect to the tie bar 12 becomes equal, so that the toggle support 11 is moved uniformly along each of the tie bars 12.
[0056]
When both the toggle support 11 and the adjustment nut 15 are formed of the same material, the front surface of the large-diameter portion 17 that faces the bottom surface of the large-diameter portion 17 and the front surface of the flange portion 19 that faces the seat surface S2. If S3 is in direct contact, galling occurs between the seating surface S2 and the front surface S3 as the mold clamping device repeatedly performs mold clamping.
[0057]
Therefore, an annular element 64 as an intermediate element and an anti-galling member is disposed between the toggle support 11 and the adjustment nut 15 in front of the flange 19 in the large-diameter portion 17 (to the right in FIG. 1). I am trying to do it. The annular body 64 is formed of a material having a hardness different from that of the toggle support 11 and the adjustment nut 15, and in the present embodiment, a material having a hardness lower than the toggle support 11 and the adjustment nut 15, for example, an annular shape formed of brass or the like. It is made of a plate and includes a front surface S4 in contact with the seat surface S2 and a rear surface S5 in contact with the front surface S3.
[0058]
A lubricant such as oil or grease is supplied between the seating surface S2 and the front surface S4, between the front surface S3 and the rear surface S5, between the flange portion 19 and the pressing plate 16, and the like. A lubrication film is formed and lubrication is performed. The first surface is constituted by the seat surface S2, the second surface is constituted by the front surface S3, the third surface is constituted by the front surface S4, and the fourth surface is constituted by the rear surface S5.
[0059]
In this case, when a mold clamping force is generated at the time of mold clamping, the toggle support 11 is pushed backward by the toggle mechanism 40 and pulls the tie bar 12 with a predetermined tensile force. When the adjusting nut 15 is pressed against the toggle support 11 via the screw 64, a high surface pressure is generated between the seat surface S2 and the front surface S4 and between the front surface S3 and the rear surface S5 in accordance with the mold clamping force. . As a result, even if the lubricant is sufficiently supplied, when a high surface pressure is applied for a long time between the seat surface S2 and the front surface S4 and between the front surface S3 and the rear surface S5, the lubricating film is cut. Sometimes.
[0060]
Further, when the mold thickness adjustment is being performed, if the adjustment nut 15 is rotated by driving the mold thickness adjustment motor 25, the toggle support 11 can be moved forward and backward (moved in the left-right direction in FIG. 1). However, when the toggle support 11 is advanced (moved to the right in FIG. 1), the adjustment nut 15 is rotated while applying a force required to advance the toggle support 11 to the seat surface S2. When the lubricating film is broken and the friction coefficient between the seat surface S2 and the front surface S4 and between the front surface S3 and the rear surface S5 is large, the lubricating film may be cut between the seat surface S2 and the front surface S4. In addition, galling occurs between the front surface S3 and the rear surface S5. Generally, in an injection molding machine, once the mold thickness is adjusted (once), molding is performed for a long time under the same conditions, so that the lubricating film is easily cut.
[0061]
However, in the present embodiment, since the annular body 64, the toggle support 11, and the adjustment nut 15 are formed of materials having different hardnesses, the annular body 64, the toggle support 11, and the adjustment nut 15 are formed between the seating surface S2 and the front surface S4 and the front surface S3. The coefficient of friction with the rear surface S5 can be reduced. Therefore, it is possible to prevent galling between the seating surface S2 and the front surface S4 and between the front surface S3 and the rear surface S5. Further, since there is no need to replace the toggle support 11 and the adjustment nut 15, the cost for repairing the mold thickness adjusting device can be reduced.
[0062]
Further, since the friction coefficients between the seat surface S2 and the front surface S4 and between the front surface S3 and the rear surface S5 are small, it is possible to prevent the toggle support 11, the adjustment nut 15, and the annular body 64 from being worn. . Therefore, the durability of the mold thickness adjusting device can be improved.
[0063]
The use of a bushing material or a self-lubricating material containing carbon or the like as the material of the annular body 64 can prevent galling from occurring. In this case, if the hardness of the bush material, the self-lubricating material, or the like is different from those of the toggle support 11 and the adjustment nut 15, the occurrence of galling can be further prevented.
[0064]
In the present embodiment, the annular body 64 is housed in the large-diameter portion 17 and can move freely with respect to the toggle support 11 and the adjustment nut 15. The fixing member, such as a bolt, can fix the annular body 64 as the intermediate element to the toggle support 11 as the fixing element or the adjusting nut 15 as the rotating element.
[0065]
In this case, when the annular body 64 is fixed to the toggle support 11, for example, when the adjustment nut 15 is rotated, the annular body 64 is not rotated with respect to the toggle support 11. Therefore, the seating surface S2 and the front surface S4 do not relatively move, and only the front surface S3 and the rear surface S5 move relatively. Even if galling occurs for some reason, the front surface S3 and the rear surface S4 do not move. Galling occurs only with S5. In that case, it is only necessary to replace the adjusting nut 15 and the annular body 64, so that the cost for repairing the mold thickness adjusting device can be reduced.
[0066]
Moreover, since the adjusting nut 15 and the annular body 64 are inexpensive parts as compared with the toggle support 11, the cost for repairing the mold thickness adjusting device can be reduced.
[0067]
In the present embodiment, the annular body 64 is formed of a material having a lower hardness than the toggle support 11 and the adjusting nut 15, but at least the hardness of the surface of the annular body 64 and the toggle support 11 and the adjusting nut For example, the hardness of the front surface S4 and the rear surface S5 can be made lower than the hardness of the seat surface S2 and the hardness of the front surface S3. In that case, in order to change the hardness of each surface, each surface is subjected to a surface treatment such as surface processing and film formation, for example, a tuftride treatment (soft nitriding treatment), a defric coat treatment and the like.
[0068]
Further, in the present embodiment, since the annular body 64, the toggle support 11, and the adjustment nut 15 are formed of materials having different hardness from each other, the seat surface S2 and the front surface S4 are connected to each other. The rear surface S5 and the rear surface S5 may be formed with different hardnesses, but the seating surface S2 and the front surface S4 may be formed with different hardnesses, and the front surface S3 and the rear surface S5 may be formed with the same hardness. it can. In this case, it is possible that galling occurs between the front surface S3 and the rear surface S5, but at least it is possible to prevent galling between the seating surface S2 and the front surface S4.
[0069]
It should be noted that the present invention is not limited to the above-described embodiment, but can be variously modified based on the gist of the present invention, and they are not excluded from the scope of the present invention.
[0070]
【The invention's effect】
As described above in detail, according to the present invention, in the contact surface protection device, the fixing element having the first surface and the first element are rotatably disposed with respect to the fixing element. A rotating element having a second surface facing the surface, a third surface disposed between the fixed element and the rotating element, the third surface being in contact with the first surface, and the third surface being in contact with the second surface And a pressing member for pressing the rotating element against the fixed element via the intermediate element.
[0071]
The first and third surfaces are formed to have different hardnesses.
[0072]
In this case, since the first and third surfaces are formed with different hardnesses, it is possible to prevent the occurrence of galling between the first and third surfaces. Therefore, it is not necessary to replace the fixed element and the rotating element, so that the cost for repairing the contact surface protection device can be reduced.
[Brief description of the drawings]
FIG. 1 is a sectional view showing a main part of a mold thickness adjusting device according to an embodiment of the present invention.
FIG. 2 is a sectional view showing a main part of a conventional mold thickness adjusting device.
FIG. 3 is a front view showing a main part of the injection molding machine according to the embodiment of the present invention.
FIG. 4 is a side view showing a main part of the injection molding machine according to the embodiment of the present invention.
[Explanation of symbols]
11 Toggle support
12 Tie bar
15 Adjusting nut
64 ring
S2 seat
S3, S4 Front
S5 back side

Claims (9)

(A) a securing element with a first surface;
(B) a rotating element provided rotatably with respect to the fixed element and having a second surface facing the first surface;
(C) an intermediate element disposed between the fixed element and the rotating element, the intermediate element including a third surface that contacts the first surface, and a fourth surface that contacts the second surface;
(D) a pressing member that presses the rotating element against the fixed element via the intermediate element,
(E) The contact surface protection device, wherein the first and third surfaces have different hardnesses. (A) a securing element with a first surface;
(B) a rotating element provided rotatably with respect to the fixed element and having a second surface facing the first surface;
(C) an intermediate element disposed between the fixed element and the rotating element, the intermediate element including a third surface that contacts the first surface, and a fourth surface that contacts the second surface;
(D) a pressing member that presses the rotating element against the fixed element via the intermediate element,
(E) The contact surface protection device, wherein the second and fourth surfaces are formed with different hardnesses. 3. The contact surface protection device according to claim 1, wherein a surface treatment is performed on one of the surfaces to make the hardness of each of the surfaces different. 4. The contact surface protection device according to claim 1, wherein the intermediate element is formed of a material having a lower hardness than the fixed element and the rotating element. The contact surface protection device according to claim 1, wherein the intermediate element is formed of a self-lubricating material. A fixed element provided with a first surface, a rotating element provided rotatably with respect to the fixed element, and having a second surface facing the first surface; Abutment surface protection of an abutment surface protection device comprising an intermediate element disposed between and having a third surface in contact with the first surface and a fourth surface in contact with the second surface In the method,
(A) pressing the rotating element against the fixed element via the intermediate element,
(B) The contact surface protection method, wherein the first and third surfaces are formed with different hardnesses. A fixed element provided with a first surface, a rotating element provided rotatably with respect to the fixed element, and having a second surface facing the first surface; Abutment surface protection of an abutment surface protection device comprising an intermediate element disposed between and having a third surface in contact with the first surface and a fourth surface in contact with the second surface In the method,
(A) pressing the rotating element against the fixed element via the intermediate element,
(B) The contact surface protection method, wherein the second and fourth surfaces are formed with different hardnesses. A mold thickness adjusting device provided with the contact surface protection device according to claim 1. A molding machine comprising the contact surface protection device according to any one of claims 1 to 5.

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