JPH0527233Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to an improvement of a knockout mechanism in a press working device.

(Prior Art) Conventionally, cylindrical sheet metal members having spline teeth formed on the circumferential surface by press working have been used, for example, in pulleys in engines for vehicles such as automobiles, hubs in automatic transmissions, and the like. When pressing such a cylindrical sheet metal member, for example, as disclosed in Japanese Patent Laid-Open No. 59-42144, a cylindrical sheet metal member placed and supported on a dicing plate (counter punch) is used. A sheet metal member is clamped and fixed on the dictation plate by the downward movement of a punch (main punch) disposed above the sheet metal member, and by further downward movement of the punch (main punch), the dictation plate is fixed. A die (lower die) placed on the side of the counter punch and a punch (main punch) compress the circumferential surface of the cylindrical sheet metal member to give plastic deformation, thereby causing the cylindrical sheet metal member to undergo plastic deformation. 2. Description of the Related Art Pressing devices that form a plurality of axially extending spline teeth on a surface are generally well known.

(Problem to be Solved by the Invention) In the above-mentioned press working apparatus, when a knock-out plate is provided as an ejection member for removing a workpiece such as a cylindrical sheet metal member from the press working apparatus after press working, i.e., for the purpose of knocking out the workpiece, the knock-out plate's work ejection surface is located on substantially the same plane as the workpiece clamping surface of the punch for its function. For this reason, when a workpiece placed and supported on the die plate is clamped and fixed between the die plate and the punch arranged above during press working, the knock-out plate is pushed up by the workpiece, and the load of the knock-out plate is applied to the workpiece, which may result in deformation of the workpiece.

The present invention has been devised in view of this point, and its purpose is to appropriately control the positional relationship of the knockout plate with respect to the punch in a press processing apparatus provided with the knockout plate as described above. As a result, even if a workpiece placed and supported on a dicing plate is clamped and fixed between punches during press processing, interference of the knockout plate with the workpiece can be avoided and the knockout plate can be pushed up by the workpiece. This prevents the load of the knockout plate from being applied to the workpiece, thereby allowing press working to be performed without deforming the workpiece. Furthermore, it is difficult to facilitate the loading and unloading of workpieces into and out of the dictation plate and to improve the positional accuracy of the knockout plate relative to the punch.

(Means for Solving the Problems) In order to achieve the above object, the present invention includes a dictation plate for placing and supporting a workpiece, a punch holder disposed above the dictation plate, and a panty holder. A punch is fixed to the lower end of the die and clamps and fixes the workpiece between the die and the die cution plate, and a punch is placed on the side of the diecution plate and presses the workpiece fixed on the diecution plate by an upward movement. The following solution was taken for a knockout mechanism in a press processing machine equipped with a processing die.

That is, the solution of the present invention is such that an elevating plate, which is supported in contact with the punch holder in a lowered state, is fitted into the punch holder so as to be movable up and down. Furthermore, a push rod that always urges the elevating plate downward is disposed above the elevating plate. Further, a knockout plate is disposed on the outer periphery of the punch so as to be movable up and down, and its upper end is fixed to the elevating plate and suspended and supported on the punch holder via the elevating plate. When the fixation of the workpiece to the plate is released, the knockout plate is lowered by the biasing force of the push rod to knock out the workpiece. In addition, when the support member is vertically movably inserted into the punch so that its upper end can come into contact with the lower surface of the lifting plate, and the workpiece is fixed on the dictation plate, In order to prevent the knockout operation of the knockout plate, the upper end of the support member is brought into contact with the lower surface of the lift plate, and the lift plate is supported by the support member against the biasing force of the push rod.

(Function) With the above configuration, in the present invention, the workpiece placed and supported on the dictation plate is held and fixed between the punch placed above the dictation plate and the dictation plate. Then, the die is pressed by the upward movement of a die placed on the side of the dicing plate. When the workpiece is released from being fixed to the dictation plate after pressing, the workpiece is knocked out by the knockout plate which is lowered by the urging force of the push rod disposed on the punch holder side.

In this case, a supporting member is placed above the dictation plate, that is, the punch is fitted with a support member that can be moved vertically, and when the workpiece is fixed on the dictation plate, the knock-out In order to prevent the knock-out operation of the plate, the upper end of the support member is supported in contact with the lower surface of the lifting plate that suspends and supports the knock-out plate on the punch holder, so that the lifting plate resists the urging force of the push rod. Since it is supported by the support member, even if the workpiece placed and supported on the dictation plate is clamped and fixed between the punches during press working, interference of the workpiece with the knockout plate is avoided, Therefore, the knockout plate is not pushed up by the workpiece, thereby preventing the load of the knockout plate from being applied to the workpiece, and the workpiece can be pressed without being deformed.

Further, the knock-out plate is disposed on the outer periphery of the punch so as to be movable up and down, and the upper end of the knock-out plate is fixed to an elevating plate which is fitted into the punch holder so as to be movable up and down. Since the knockout plate is suspended and supported by the punch holder through the punch holder, it is necessary to place the workpiece on the dictation plate during press processing, or to remove the workpiece from the dictation plate after press processing. There are no obstacles above or to the sides of the workpiece placement area that would impede the loading and unloading of the workpiece, making it easy to load and unload the workpiece.

In addition, since the knock-out plate and punch are both placed on the common punch holder side, the knock-out plate is positioned with respect to the punch with more precision than when they are placed separately on different parts, and the workpiece is You will definitely be knocked out.

(Example) Hereinafter, an example of the present invention will be described based on the drawings.

FIG. 1 shows a cylindrical portion _w1 ,
A cylindrical _sheet metal workpiece _{W has spline teeth w 3 (} as _shown in FIG. An example of forming the material by press working will be described.

Reference numeral 1 denotes a short cylindrical dictation plate which is movable up and down and supports the workpiece W on its upper surface; 2 is a punch holder disposed above the dictation plate 1; The lower surface of the protrusion 2a protruding to the inside of the lower end of the holder 2 (on the right side in the figure) is provided with the above-mentioned dictation plate 1.
A cylindrical punch 3 having the same outer diameter is integrally fixed to the dictation plate 1 so as to face it. Further, on the outer periphery of the lower end of the punch 3,
A plurality of tooth grooves (not shown) extending in the vertical direction are formed in the circumferential direction, corresponding to the shape of the internal teeth of the spline teeth w ₃ to be formed in the cylindrical portion w ₁ of the workpiece W. Furthermore, on the outer periphery of the lower surface of the punch 3, there is a notch 3a corresponding to the wall thickness dimension of the flange portion _w2 of the workpiece W.
is formed in the circumferential direction, and a cutout-shaped engagement step 2b with which an outer flange 9a of a support member 9 to be described later engages is formed on the inner periphery of the upper end of the overhang 2a of the punch holder 2. There is. Then, the punch 3 engages its notch 3a with the flange portion _w2 of the workpiece W supported on the dictionary plate 1 by the upward movement of the dictionary plate 1, and moves the workpiece W into the die. It is designed to be clamped and fixed on the cushion plate 1.

Further, a die holder 4 is disposed on the side of the dictation plate 1 so as to be movable up and down, and a cylindrical die 5 is integrally fixed to the upper end of the die holder 4 so as to surround the dictation plate 1. has been done. Further, on the inner circumferential surface of the die 5, there are formed a plurality of grooves extending in the vertical direction corresponding to the tooth groove shapes of the spline teeth _w3 to be formed on the cylindrical portion _w1 of the workpiece W, that is, the tooth grooves of the punch 3. Tooth part 5
a, 5a, ... (only one is shown in the figure) are formed in the circumferential direction. And the above dice 5 is
The cylindrical portion w 1 of the workpiece W, which is moved upward by the upward movement of the die holder 4 and is fixed on the die cutting plate ₁ , is sandwiched between the punch 3 and the cylindrical portion w ₁ of the workpiece W is thereby separated. A plurality of spline teeth w ₃ , w ₃ , . . . are press-formed on the workpiece cylindrical portion w ₁ by pressing radially inward with the die tooth portion 5a and causing plastic flow within each punch tooth groove. .

Furthermore, a large diameter hole 2d and a small diameter hole 2e continuous to the upper end of the large diameter hole 2d are integrally formed above the overhanging portion 2a of the punch holder 2, and a An elevating plate 7, which is supported in contact with the upper surface of the overhanging portion 2a in this state, is fitted and disposed so as to be movable up and down.

Further, a push rod 6 extending in the vertical direction is fitted into the small diameter hole 2e of the punch holder 2, and the push rod 6 is disposed above the elevating plate 7, and the lower end thereof is connected to the elevating plate 7.
are integrally fixed, and the elevating plate 7 is always urged downward by a push rod 6 so as to be supported by the projecting portion 2a of the punch holder 2.

Furthermore, on the outer periphery of the lower surface of the lifting plate 7,
a plurality of downwardly extending knockout plates 8;
8,... (only one is shown in the figure) are integrally fixed at a predetermined interval, and each knockout plate 8 is connected to the overhanging portion 2 of the punch holder 2.
It is fitted into a through hole 2c penetrating in the vertical direction of a, and is disposed on the outer periphery of the punch 3 so as to be movable up and down, and is suspended and supported by the punch holder 2 via the elevating plate 7. Further, at the lower end of each knockout plate 8, a bulging portion 8a is integrally formed which bulges in the lateral direction so that the outer periphery is in sliding contact with the outer periphery of the punch 3.

As shown in FIG. 1, each knockout plate 8 is normally urged downward by the push rod 6 to move the elevating plate 7 to the protruding portion of the punch holder 2. 2a
By bringing the lower end of the bulging portion 8a into contact with the lower end of the punch 3, the lower end of the bulging portion 8a is positioned substantially on the same plane as the lower end of the punch 3, and during processing, as shown in FIGS. 2 to 6, the die cutting plate 1 or the die holder 4 As a result of the upward movement of the push rod 6, the push rod 6 is pushed up against the biasing force of the push rod 6, and a predetermined distance is left between it and the protruding portion 2a of the punch holder 2. On the other hand, when knocking out after processing, as shown in FIG. Before processing (state shown in Figure 1)
Similarly, the bulge portion 8a of each knockout plate 8
The lower end is positioned substantially on the same plane as the lower end of the punch 3, and the workpiece W after press working is knocked out.

Further, as a feature of the present invention, above the dictation plate 1, an outer flange portion 9a is provided on the outer periphery of the upper end.
The cylindrical support member 9 has an outer flange 9a.
The engaging stepped portion 2 of the overhanging portion 2a of the punch holder 2
b, and is fitted into the hole 3b of the punch 3 so as to be vertically movable. Further, the outer flange portion 9a of the support member 9 has an upper end brought into contact with the lower surface of the elevating plate 7 that supports each of the knockout plates 8, and a lower end lower than the lower surface of the punch 3 before processing. It is made to stand out.

The supporting member 9 is arranged so that the workpiece W to be subjected to press working is attached to the dictation plate 1.
When the flange w2 of the workpiece W is held between the punch 3 and the flange _w2 of the workpiece W by the upward movement of the dictation plate 1, as shown in FIG.
If the workpiece stands between the lifting plate 7 supporting the workpiece W and the dictation plate 1, the upper end of the knockout plate 8 should be moved to prevent the knockout (downward) movement of the workpiece W so that the knockout plate 8 does not come into contact with the workpiece W. The elevating plate 7 is brought into contact with the lower surface of the elevating plate 7 to support the elevating plate 7 against the biasing force of the push rod 6.

Next, the operation of the above embodiment will be explained based on FIGS. 1 to 7.

First, as shown in FIG. 1, the workpiece W is placed and supported on the upper surface of the dictation plate 1 in a state in which both the dictation plate 1 and the die 5 are lowered. In this state, the support member 9 is suspended and supported with its outer flange 9a engaged with the engagement stepped portion 2b of the punch holder 2.

Next, as shown in FIG. 2, when the dictation plate 1 is raised, its upper surface comes into contact with the lower end of the support member 9, and the plurality of knockout plates 8, 8, . . . and push it upward against the urging force of the push rod 6. And the dictation plate 1
When the upper surface of the workpiece W comes into contact with the lower surface of the punch 3 and the flange portion _w2 of the workpiece W is held between the punch 3 and the knockout plate 8 and is fixed on the dictation plate 1, the dictation Stop the lifting operation of plate 1.

After that, as shown in FIGS. 3 and 4,
The die 5 is raised by the rising operation of the die holder 4, and while pushing up each of the knockout plates 8 in the rising process of the die 5, the plurality of die teeth 5a, 5a, . . . ₂ is plastically deformed to form spline teeth w ₃ , w ₃ ,...

Thereafter, as shown in FIGS. 5 and 6, when the die 5 is lowered by the downward movement of the die holder 4, the pushing force of the die 5 against each knockout plate 8 is released, and each knockout plate 8 is lowered by the urging force of the push rod 6. The downward movement of each knockout plate 8 is stopped at a position above the flange portion _w2 of the workpiece W by the contact of the elevating plate 7 that supports each knockout plate 8 with the support member 9. Contact with the flange portion _w2 is avoided.

Thereafter, as shown in FIG. 7, when the dictation plate 1 is lowered, the pushing force of the dictation plate 1 against the support member 9 is released, and the support member 9 is lowered and attached to the punch holder 2. Supported by hanging. At the same time, the upward force of the support member 9 on the elevating plate 7 is also released, and the knockout plate 8 descends, pressing the upper end of the flange portion _w2 of the work W with its bulging portion 8a, thereby knocking out the work W.

As described above, in this embodiment, when the workpiece W is clamped and fixed on the dictation plate 1 by the punch 3, the support member 9 is replaced with an elevating plate that supports the plurality of knockout plates 8, 8, . By standing between the knockout plate 7 and the dictation plate 1, the downward movement of the knockout plate 8 is prevented and the knockout plate 8 is prevented from contacting the workpiece W.

Therefore, the knockout plate 8 is not pushed up by the workpiece W, thereby preventing the load of the knockout plate 8 from being applied to the workpiece, and it is possible to press the workpiece W without deforming it.

Further, in the embodiment described above, the knockout plate 8 is disposed on the outer periphery of the punch 3 so as to be movable up and down, and the upper end of the knockout plate 8 is disposed on the elevating plate 7 which is fitted into the punch holder 2 so as to be movable up and down. Since the knock-out plate 8 is suspended and supported on the punch holder 2 via the lifting plate 7, the workpiece W can be placed on the dictation plate 1 during press working,
Alternatively, when taking out the workpiece W from the dictation plate 1 after press working, the workpiece W is
Eliminates obstacles that impede the entry and exit of
The work W can be easily taken in and out of the dictation plate 1.

In addition, in the above embodiment, since the knockout plate 8 and the punch 3 are both arranged on the common punch holder 2 side, the knockout plate 8 and the punch 3 are arranged on the side of the common punch holder 2, compared to the case where they are arranged separately on different members. It is possible to accurately position the workpiece W against the workpiece W, and the workpiece W can be reliably knocked out.

In the above embodiment, the workpiece W is fixed on the dictation plate 1 by raising and lowering the dictation plate 1 relative to the fixed punch 3. However, the work W is not limited to this, for example, It is also possible to do this by keeping the dictation plate 1 fixed and moving the punch 3 up and down with respect to the dictation plate 1. In this case, the knockout of the workpiece W by the knockout plate 8 is performed by the upward movement of the punch 3.

(Effect of the invention) As explained above, according to the invention, when a workpiece is fixed on the dictation plate, the knock-out plate disposed above the dictation plate can be removed from the knock-out plate. Since the workpiece is supported by the support member to prevent movement, even if the workpiece placed and supported on the dictation plate is held and fixed between the punches during press working, the workpiece will not interfere with the knock-out plate. It is possible to press the workpiece without deforming it. Furthermore, because the knockout plate is arranged around the outer periphery of the punch so that it can move up and down, and is suspended from the punch holder, there are no obstacles above and to the sides where the workpiece is placed, preventing the workpiece from being inserted or removed before or after press processing. The work piece can be easily taken in and out of the dictation plate. Furthermore, since the knockout plate and the punch are both disposed on the common punch holder side, the knockout plate can be positioned relative to the punch with high accuracy, and the workpiece can be reliably knocked out.

[Brief explanation of the drawing]

1 to 7 are longitudinal cross-sectional views showing the operating state of a press machine equipped with a knockout mechanism according to an embodiment of the present invention. DESCRIPTION OF SYMBOLS 1... Diction plate, 2... Punch holder, 3... Punch, 5... Dice, 6... Push rod, 7... Lifting plate, 8... Knockout plate, 9... Supporting member, W... …work.

Claims (1)

[Claims for Utility Model Registration] A dictation plate for placing and supporting a workpiece; a punch holder disposed above the dictation plate; and a punch holder fixed to the lower end of the punch holder for dictating the workpiece. Knock-out in a press processing device equipped with a punch that is clamped and fixed between a plate and a die that is placed on the side of the dicing plate and that presses a workpiece fixed on the dicing plate by an upward movement. The mechanism comprises: an elevating plate which is fitted into the punch holder so as to be movable up and down and is supported in contact with the punch holder in a lowered state; a push rod disposed on the outer periphery of the punch so as to be movable up and down, the upper end of which is fixed to the elevating plate and suspended from the punch holder via the elevating plate; When the fixation of the workpiece to the plate is released, the knockout plate descends by the biasing force of the push rod and knocks out the workpiece, and the punch is movable up and down so that its upper end can come into contact with the lower surface of the lifting plate. When the workpiece is inserted and placed and fixed on the dictation plate, the upper end of the push rod is brought into contact with the lower surface of the elevating plate to prevent the knockout operation of the knockout plate. 1. A knock-out mechanism in a press working apparatus, characterized in that the knock-out mechanism is comprised of a support member that supports an elevating plate against the pressure.