JP2007152409A - Clearance-specified guide set - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a clearance-specified guide set which provides a guide post and a guide bush matching with the clearance required by a customer while suppressing an increase in the manufacturing cost. <P>SOLUTION: The guide set is used for guiding opening and closing of fixed side and movable side dies and composed of the guide post and the guide bush. The prefabricated guide post 100 having allowed tolerance and the prefabricated guide bushes 110, 120 having allowed tolerance are prepared and the guide set 200 is composed by combining the guide post 100 and the guide bushes 110, 120 for optional clearance C between the guide post 100 and the guide bushes 110, 120. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to the accuracy (clearance) of a guide post and a guide bush constituting a mold, and more particularly, to a clearance designation guide set that provides a guide set of a guide post and a die bush having an optimum and uniform accuracy (clearance). .

  The guide post and guide bush are used to guide the upper and lower molds so that they move smoothly when the mold is opened (or closed). A guide bush (or guide post) is attached to the upper mold. A guide post (or guide bush) is attached to the lower die for use. If the mold is displaced between the upper mold and the lower mold, the finished product will be affected. Therefore, the mold opens and closes smoothly, and when the mold is opened, there is a gap between the upper mold and the lower mold. It is important to prevent it from occurring. For this reason, it is necessary to minimize the accuracy (clearance) of the guide posts and guide bushes constituting the mold.

  The accuracy (clearance) between the guide post and the guide bush is the distance between the guide post and the guide bush when the guide bush is manufactured to an accurate dimension without error. Since the clearance between the guide post and the die bush affects the finished product molded by the mold, the clearance between the guide post and the guide bush attached to the mold is 2 μm, 3 μm, 4 μm, etc. It is specified in advance according to the accuracy of. When the clearance is specified in this way, the distance between the guide post and the guide bush is specified, and there is no dimensional error in the manufacture of the guide post and the guide bush, and the guide post when manufactured to an accurate dimension. The distance between the guide bush and the guide bush is specified.

  Regarding the clearance between the guide post and the die bush, the first and second molds are thermally expanded and contracted, and the thermal expansion and contraction displacements in the first and second molds are different. A guide post and a guide bush capable of appropriately securing the positioning accuracy of the first and second molds while absorbing the difference in thermal expansion and contraction between the first and second molds. Has been proposed (see, for example, Patent Document 1).

However, in this patent document 1, no method for preventing variation in the clearance between the guide post and the guide bush is taken.
JP2004-42269

  Since the clearance between the guide post and the guide bush affects the finished product formed by the mold, the clearance between the guide post and the guide bush attached to the mold is 2 μm, 3 μm, 4 μm, etc. Specified in advance according to the accuracy of the molded product. In this way, when opening and closing the mold, the gap between the guide post and the guide bush is specified when specifying the clearance so that the mold can be opened and closed smoothly without looseness. The distance between the guide post and the guide bush when the guide post and the guide bush are manufactured to an accurate dimension without error is specified. Therefore, conventionally, the dimensional accuracy during manufacture of the guide post and the guide bush is improved, and the range of variation is narrowed so as to be adapted to the specified clearance.

  By the way, in manufacturing the guide post, a tolerance (for example, ± 0.005) is recognized in the outer dimensions of the guide post. Even when the guide bush is manufactured, a tolerance (for example, ± 0.005) is recognized in the inner diameter of the guide bush.

  For this reason, there is no problem if the clearance between the guide post and the guide bush is specified and the guide post and the guide bush are manufactured accurately without dimensional error, but tolerance is allowed for each of the guide post and the guide bush. If it is within the range, it is recognized as a guide set product. Therefore, even if the clearance between the guide post and the guide bush is specified, if the tolerance of the guide post outer dimension is, for example, -0.005 and the tolerance of the guide bush inner diameter is, for example, +0.005, Even if qualification is recognized, there is a problem that the clearance between the guide post and the guide bush is not the planned clearance.

  Therefore, in order to match the clearance required by the customer, a method of measuring the inner diameter of the guide bush used and manufacturing the guide post so as to obtain a specified clearance from the inner diameter is employed. For this reason, it has the problem that manufacturing cost becomes high.

  An object of the present invention is to provide a clearance-designated guide set that can provide a guide post and a guide bush suitable for a clearance required by a customer while suppressing an increase in manufacturing cost.

  A clearance designation guide set according to the present invention guides opening and closing of a fixed side and a movable side of a mold, and is a guide set composed of a guide post and a guide bush, which is pre-manufactured with an allowable tolerance. A post and a guide bush manufactured in advance with an acceptable tolerance are provided. For any guide post and guide bush clearance, the guide post and the guide bush are combined to provide a guide set having a clearance desired by the user. It is composed.

  According to the present invention, it is possible to suppress an increase in manufacturing cost of a guide post and a guide bush that meet a clearance required by a customer.

  The present invention includes a plurality of guide posts manufactured within an allowable tolerance range and a plurality of guide bushes manufactured within an allowable tolerance range, and is arbitrarily set by a user. This is achieved by selecting arbitrarily so as to be within the clearance between the guide post and the guide bush, and configuring the guide set by combining the guide post and the guide bush.

  FIG. 1 shows a basic view showing the entire press die to which a clearance designation guide set according to the present invention is applied. This clearance designation guide set according to the present invention will be described as an example used in a press die in this embodiment.

  In FIG. 1, reference numeral 1 denotes a press die, which is composed of an upper die 2 and a lower die 3. Reference numeral 4 denotes a punch holder, which is a plate for attaching to a press machine. Reference numeral 5 denotes a punch backing plate which is attached to prevent the force from being directly applied to the punch holder 4 when the surface pressure on the bottom surface of the punch is high. A punch plate 6 is a plate for attaching the punch. 7 is a stripper plate for removing the material from the periphery of the punch, protecting the punch strength, and preventing the material from being deformed when the punch is pulled out. Reference numeral 8 denotes a die holder, which is a plate for mounting on a press machine.

  9 is a die backing plate and 10 is a die plate. This die plate 10 is a plate for placing a product and pressurizing the product, and the die backing plate 9 is used when the die plate 10 is an insert type and the surface pressure of the die insert becomes high. It is. A shank 11 is attached to the punch holder 4 of the upper die 2 and transmits the power of the press machine to the upper die 2. A hook 12 is attached to the punch holder 4 of the upper die 2 and is used to lift the press die 1, move the press die 1, and open or close the upper die 2 and the lower die 3. It is a handle.

  A bush 13 is positioned on the punch holder 4 of the upper die 2 and is attached to the punch holder 4. Reference numeral 14 denotes a ball retainer that is fitted to the bush 13, and 15 is a die set guide post. The ball retainer 14 is fitted to the tip of the die set guide post 15. Reference numeral 16 denotes a spring for holding the ball retainer 14 at an appropriate position when the upper die 2 and the lower die 3 are combined.

  Reference numeral 17 denotes a washer fitted to the die holder 8 of the lower mold 3, and 18 denotes a fastening bolt for fixing the die set guide post 15 to the die holder 8 using the washer 17. The bush 13, the ball retainer 14, the die set guide post 15, the spring 16 and the washer 17 constitute a die set guide post set. Reference numeral 19 denotes a stroke end block which is fixed to the punch holder of the upper die 2 and is attached to the lower die stroke end block 36 at the bottom dead center of the press to stabilize the bottom dead center position. Reference numeral 20 denotes a fastening bolt for fixing the stroke end block 19 to the punch holder 4 of the upper die 2.

  Reference numeral 21 denotes a sub guide post that passes through the punch plate 6 and the stripper plate 7 and is fixed to the punch backing plate 5. The sub guide post 21 is positioned on the punch plate 6 and is used for positioning the stripper plate 7 and the die plate 10. is there. Reference numeral 22 denotes a fastening bolt for fixing the sub guide post 21 to the punch backing plate 5. Reference numeral 23 denotes a stripper bush fitted in a hole for inserting the sub guide post 21 formed on the stripper plate 7, and is for regulating the position of the stripper plate 7 by the sub guide post 21. Similar to the stripper bush 23, 24 is a die bush fitted in a hole for inserting the sub guide post 21 formed in the die plate 10 and the die backing plate 9. The sub guide post 21 regulates the position of the die plate 10. belongs to. This sub guide post 21 corresponds to the guide post of the present invention. Further, the stripper bush 23 and the die bush 24 correspond to the guide bush of the present invention. The sub guide post 21 (guide post), the stripper bush 23 (guide bush), and the die bush 24 (guide bush) constitute a guide set.

  The guide post and the guide bush are configured as shown in FIGS. That is, the guide post 100 (sub-guide post 21) shown in FIG. 2 has a configuration of a guide post with a flange. A guide bush 110 (stripper bush 23) is slidably fitted to the guide post 100. A clearance C is formed between the outer peripheral surface of the guide post 100 and the inner peripheral surface of the guide bush 110. The guide post 100 and the guide bush 110 constitute a guide set 200.

  FIG. 3 shows a guide set 200 in which two guide bushes 110 and 120 are slidably fitted to the guide post 100. In FIG. 3, C is a clearance that can be set between the outer peripheral surface of the guide post 100 and the inner peripheral surfaces of the guide bushes 110 and 120. The guide post 100 has the same configuration as the guide post 100 shown in FIG. As shown in FIG. 4, the guide bushes 110 and 120 are formed in a cylindrical shape, and a solid lubricant (for example, graphite) is mounted in a ring shape inside the cylinder. In this embodiment, a solid lubricant (for example, graphite) provided in a ring shape on the inner peripheral surface side of the guide bushes 110 and 120 is shown. Even if a ball bearing is attached, the object of sliding can be achieved. However, when a ball bearing is mounted, it is inferior to that provided with a solid lubricant (for example, graphite) in a ring shape in that the guide bushes 110 and 120 are large. Further, the cylindricality and the surface roughness coaxiality of the guide post 100 and the guide bushes 110 and 120 constituting the guide set 200 are improved, and the guide post 100 and the guide bush 110 constituting the guide set 200 are improved. , 120 are manufactured with cylindricity and surface roughness coaxiality as the minimum required accuracy.

  In the present embodiment, a plurality of guide posts 100 manufactured within the allowable tolerance range and a plurality of guide bushes 110, 120 manufactured within the allowable tolerance range are provided in advance. The guide post 100 and the guide bushes 110 and 120 are arbitrarily selected so as to be within the range of the clearance C between the guide post 100 and the guide bushes 110 and 120, and the guide set 100 is configured by combining the guide post 100 and the guide bushes 110 and 120. By eliminating the variation in the clearance C, the accuracy that is the original purpose of the guide set 200 is improved. For one guide post 100, two guide bushings 110, 120 can be combined, as shown in FIG. In this case, the guide bush 110 attached to the stripper plate 7 and the guide bush 120 attached to the die plate 10 are the same.

  In the press die, usually two or four guide sets 200 are used, and the position A shown in FIG. However, when the gap (clearance) C between the guide post 100 and the guide bushes 110 and 120 varies, the guide post 100 and the guide bushes 110 and 120 are in contact with each other, and the position of A shifts. Further, the contact between the guide post 100 and the guide bushes 110 and 120 causes wear and seizure of the guide post 100 and the guide bushes 110 and 120. In the present embodiment, this can be eliminated by making the gap (clearance) C between the guide post 100 and the guide bushes 110, 120 uniform.

  Therefore, according to the present embodiment, even if NC controlled machining is performed, the clearance C actually affects the position accuracy of the upper die and the lower die. Further, according to the present embodiment, it is possible to improve the positional accuracy of the upper die and the lower die, and to manufacture the guide post 100 and the guide bushes 110 and 120 at a lower cost than the conventional method that increases the accuracy of each.

  The die holder 8 is also formed with a through hole communicating with holes formed in the die plate 10 and the die backing plate 9, and when the press machine is differentially inserted, the sub guide post 21 is inserted into the through hole. It is like that.

  Reference numeral 25 denotes a knock pin which positions the punch holder 4 and the punch plate 6 and improves the reproducibility and maintainability when the plates are separated for maintenance or the like. 26 is a misfeed pin, 27 is a spring, 43 is a screw plug, 28 is a microswitch, and 29 is a relation pin. The misfeed pin 26 is fitted into the punch plate 6, and the microswitch 28 is fixed to the punch holder 4. When the tip of the misfeed pin 26 does not fit into the hole formed in the product to be processed, that is, when a feed error occurs, the spring 27 operates to lower the upper die and perform the press processing. The misfeed pin 26 is in contact with the product to be processed and is reduced when it cannot move with the lowering of the upper die, and the screw plug 43 is fitted into a hole formed in the punch holder 4. The spring 27 is pressed so as not to jump out of the hole of the punch holder 4. The microswitch 28 is switched by the movement of the relation pin 29. The tip of the relation pin 29 is in a state of being fitted in a recess formed at an appropriate location on the circumferential surface of the misfeed pin 26. When the tip of the relation pin 29 is removed from the recess of the misfeed pin 26, The relation pin 29 moves. When the relation pin 29 moves, the microswitch 28 is switched. Therefore, when the tip of the misfeed pin 26 is fitted in the hole formed in the product to be processed, it indicates that no feed error has occurred. When the machine is activated and the upper die is lowered and press working is performed, the tip of the misfeed pin 26 hits the surface of the product to be processed, and the microswitch 28 and the relation pin 29 move with the lowering of the upper die. The lowering of the pin 26 is regulated by the product, the tip of the relation pin 29 is removed from the recess of the misfeed pin 26, the relation pin 29 moves, and the micro switch 28 is operated.

  30 is a stripper bolt, 31 is a spring fitted to the stripper bolt 30, and a spacer ring 39 is interposed between the spring 31 and the punch backing plate 5 as shown in FIG. The stripper bolt 30 prevents the stripper plate 7 from popping out by a spring force and keeps the gap between the punch plate 6 and the stripper plate 7 constant. The spring 31 generates a necessary stripper force. Reference numeral 32 denotes a lifter pin, which is slidably fitted in a through hole formed in the die plate 10 and is a pin for pushing up a product to be processed after pressing. The lifter pin 32 is supported by a spring 33 that fits into a through hole that penetrates the die backing plate 9 and the die holder 8. The spring 33 is stopped by a screw plug 34.

  Reference numeral 35 denotes a relief hole which is received when the tip of the misfeed pin 26 penetrates a hole formed in advance in a product to be processed during press working. Reference numeral 36 denotes a stroke end block which is fixed to the die holder 8 of the lower die 3 and is attached to the upper die stroke end block 19 at the bottom dead center of the press to stabilize the bottom dead center position. Reference numeral 37 denotes a fastening bolt for fixing the stroke end block 36 to the die holder 8 of the lower mold 3. A hook 38 is attached to the die holder 8 of the lower die 3 and is a handle for lifting the press die 1 or moving the press die 1. Reference numeral 42 denotes a knock pin for positioning the die holder 8 and the die plate 10.

  This clearance designation guide set according to the present invention can be applied to a resin mold and a die-cast mold in addition to a press mold, and here, an example used for a resin mold will be described.

  In FIG. 6, reference numeral 51 denotes a counterbore mold base of a resin mold and a die-casting mold, which is composed of a fixed side 52 and a movable side 53. The main type of the counterbore method is a method of forming a counterbore that embeds the head of the push pin when an ejector pin (not shown) is attached. A parting line 54 separates the fixed side 52 and the movable side 53.

  55 is a locate ring, 56 is a fastening bolt for attaching the locate ring, 57 is a spool bush, and 58 is a fastening bolt for attaching the spool bush 57. 59 is a hook mounting tap hole, 60 is a tightening bolt, 61 is a guide bush, and 62 is a guide pin. Also, 63 is a return pin, 64 is a return pin spring, 65 is an ejector plate clamping bolt, 66 is an ejector rod, 67 is a clamping bolt, and 68 is a shoulder bolt.

  FIG. 7 shows a spacer-type mold base in which a spacer ring 70 is provided on the ejector plate on the movable side 53. This spacer-type mold base provides a space for ejector pin heads when attaching ejector pins (not shown). In this method, it is possible to eliminate the process of forming a counterbore for embedding the ejector pin head. 71 is an ejector plate, 72 is an ejector plate.

  This guide pin 62 corresponds to the guide post of the present invention. The guide bush 61 corresponds to the guide bush of the present invention. The guide pin 62 and the guide bush 61 constitute a guide set.

  The guide post and the guide bush are configured as shown in FIG. That is, the guide post 100 (guide pin 62) shown in FIG. 2 has a configuration of a guide post with a flange. A guide bush 110 (guide bush 61) is slidably fitted to the guide post 100. A clearance C is formed between the outer peripheral surface of the guide post 100 and the inner peripheral surface of the guide bush 110. The guide post 100 and the guide bush 110 constitute a guide set 200.

  In the present embodiment, a plurality of guide posts 100 manufactured within the allowable tolerance range and a plurality of guide bushes 110 manufactured within the allowable tolerance range are provided in advance and arbitrarily set. The guide post 100 and the guide bush 110 are arbitrarily selected so as to be within the range of the clearance C, and the guide post 100 and the guide bush 110 are combined to constitute the guide set 200. This eliminates the accuracy that is the original purpose of the guide set 200.

  Therefore, according to the present embodiment, even if NC controlled machining is performed, the clearance C actually affects the position accuracy of the upper die and the lower die. In addition, according to the present embodiment, the positional accuracy of the upper die and the lower die can be improved, and can be manufactured at a lower cost than the conventional method for increasing the accuracy of each of the guide post 100 and the guide bush 110.

The basic diagram which shows the whole press metal mold | die to which the clearance specification guide set which concerns on this invention is applied. The partial cross section whole block diagram of the guide set used for the press die shown in FIG. The partial cross section whole block diagram which shows the guide set by which two guide bushes are slidably fitted by the guide post. FIG. 4 is an overall half sectional configuration diagram of a guide bush illustrated in FIG. 3. The figure which shows the relationship between the installation position and center position of a guide set. The front view of the counterbore mold base of the resin mold die to which the clearance designation guide set according to the present invention is applied. The side view of the spacer type mold base to which the clearance specification guide set concerning the present invention is applied.

Explanation of symbols

21 ……………… Sub guide post 23 ……………… Stripper bush 24 ……………… Die bush 61 ……………… Guide bush 62 ……………… Guide pin 100 ………… …… Guide Post 110 ……………… Guide Bush 120 …………… Guide Bush 200 …………… Guide Set C ………………… Clearance

Claims (2)

A guide set consisting of guide posts and guide bushes that guides the opening and closing of the fixed and movable sides of the mold.
A guide post pre-manufactured with an allowable tolerance and a guide bush pre-manufactured with an allowable tolerance;
A clearance-designated guide set, wherein a guide set is configured by combining the guide post and the guide bush with respect to an arbitrary guide post and guide bush clearance. The clearance setting guide set according to claim 1, wherein the guide set constituting the guide bush includes two guide bushes for one guide post.

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