JP2002355865A - Method for cutting gate of resin molded product - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for cutting a gate of a resin molded product by which the manufacturing operation efficiency of a high-quality resin molded product can be enhanced by properly cutting a gate part and avoiding the generation of a cut mark on the cut face of the resin molded product. SOLUTION: A resin molding material 4 with a gate part 3 which is interposed between the resin molded part 1 and a sprue runner 2 to make both 1 and 2 continuous is set to meet the gate part 3 by positioning a movable cutting blade 5A with a cutting edge 5a and a movable contact member 5B with a cutting edge 5b opposite to each other in the vertical direction. In addition, both movable cutting blade 5A and movable contact member 5B are moved respectively in the cutting direction and first, the cutting edge 5a is brought into contact with one p1 of the ends, in the cutting direction, of the gate part 3 and the gate part 3 is supported by the cutting edge 5b. After that, only the movable cutting blade 5A is moved from the end p1 to the other end p2, in the cutting direction, of the gate part 3 and thus the gate part 3 is cut.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gate for a resin molded product taken out of a resin molding machine, provided with a gate portion for connecting the resin molded product and the spool runner and the resin molded product and the spool runner. The present invention relates to a method for cutting a gate of a resin molded product for cutting a gate portion.

[0002]

2. Description of the Related Art A high quality resin molded product is provided with a gate portion for connecting the resin molded product and a spool / runner so that the gate portion can be properly formed from a resin molding material taken out of a resin molding machine. Obtained by cutting. As a conventional gate cutting method, a manual cutting method using a manual tool such as a nipper and an automatic cutting method using a cutting device (for example, an air nipper for gate processing) are known.

In the former manual cutting method, the quality of the resin molded product and the cutting processing amount vary depending on the skill of the operator, and mass production of high quality resin molded products is hindered.

On the other hand, the latter automatic cutting method can realize mass production of resin molded articles by increasing the amount of cutting processing. This automatic cutting method is performed as shown in FIG. That is, a gate which is interposed between the resin molded product 1 taken out of the resin molding machine and the spool / runner 2 to make them continuous with each other.
A pair of cutting blades 5A and 5B opposed to each other in the vertical direction with respect to the resin molding material 4 having the gate portion 3 correspond to the gate portion 3 as shown by a solid line, and a cutting blade drive (not shown) By operating the source, the cutting blades 5A, 5B are directly or indirectly advanced toward the other cutting blade, and the cutting edges of the cutting blades 5A, 5B are brought into contact with each other as shown by a two-dot chain line,
The gate portion 3 is cut, and the resin molded product 1 is collected.

[0005]

However, when the pair of cutting blades 5A and 5B are advanced toward the other cutting blade, the configuration shown in FIG.
0, the cutting is performed by bringing the cutting edges of the pair of cutting blades 5A and 5B into contact with each other at an intermediate position P in the cutting direction in the gate portion 3, so that the resin molded article 1 has the intermediate position P Thus, a composite cutting surface C is formed in which a cutting surface C1 cut by one cutting blade 5A and a cutting surface C2 cut by the other cutting blade 5B continue. Moreover, the cutting edges of the cutting blades 5A and 5B are set at the intermediate position P.
It is practically difficult to make uniform contact without misalignment at the time of cutting. Even if they are in contact with each other, there is a possibility that a minute positional shift may occur over time.

[0006] Due to such misalignment, uniform contact between the blade edges is impaired and improper cutting is performed.
Since cut traces 6 composed of burr-like minute projections are generated on the composite cut surface C of the resin molded product 1 and degrade the quality of the resin molded product 1, an extra finishing operation step for removing the cut traces 6 is required. As a result, the efficiency of the manufacturing operation of the high quality resin molded article 1 is reduced.

Therefore, the present invention avoids the generation of cut marks on the cut surface of a resin molded product by appropriately cutting the gate portion, thereby improving the efficiency of manufacturing work of a high quality resin molded product. It is an object of the present invention to provide a method for cutting a gate of a resin molded product, which can improve the performance.

[0008]

According to a first aspect of the present invention, there is provided a method for cutting a gate of a resin molded product, comprising the steps of: Resin molding for providing a gate portion for making the spool runner continuous, and cutting the gate portion of the resin molding material taken out of the resin molding machine to separate the gate portion from the resin molded product. A method of cutting a gate of an article, comprising: interposing the gate portion between a movable cutting blade and a movable contact member facing the cutting blade in a cutting direction, and then moving the movable cutting blade by a first driving source. The movable cutting member is moved in the cutting direction by the second drive source, and the movable cutting blade is cut in the gate portion while the movable contact member is in contact with one end of the gate portion in the cutting direction. The gate part is cut by moving from the other end to the one end in the cutting direction. It is.

In order to achieve the above object, a method for cutting a gate of a resin molded product according to the invention according to claim 2 is as follows.
A gate portion for connecting the resin molded product and the spool runner and the resin molded product and the spool runner, and cutting the gate portion of the resin molded material taken out of the resin molding machine; A method for cutting a gate of a resin molded product, wherein the gate portion is separated from the resin molded product, wherein the gate portion is provided between a movable cutting blade and a fixed contact member facing the cutting blade in a cutting direction. After the fixed contact member is brought into contact with one end of the gate portion in the cutting direction, the movable cutting blade is gated by the drive source.
The gate portion is cut by moving the gate portion from the other end in the cutting direction to one end in the cutting direction.

According to the first or second aspect of the present invention, the movable contact member is brought into contact with one end of the gate portion in the cutting direction, and the gate portion is supported by the movable contact member. Then, the movable cutting blade is moved from the other end of the gate portion in the cutting direction to a position where the movable cutting blade comes into contact with the movable contact member, and the gate portion is cut. As a result, a single cut surface is formed, and a cut mark formed by burr-like minute projections is not generated.

[0011]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing a first embodiment of the present invention; FIG. 1 is an operation explanatory view showing an embodiment according to the first aspect of the present invention, and the same or corresponding parts as those in FIGS. 9 and 10 are denoted by the same reference numerals. In FIG. 1, a resin molding material 4 having a gate portion 3 interposed between a resin molding product 1 taken out of a resin molding machine and a spool / runner 2 to connect the resin molding product 1 and the spool runner 2 with each other is provided. A movable cutting blade 5A having a cutting edge 5a and a movable contacting member 5B having a cutting edge 5b opposed to the cutting edge 5a at the tip thereof are opposed to each other in the vertical direction as shown by a solid line and correspond to the gate portion 3. The movable cutting blade 5A is moved by the first drive source 7 and the movable contact member 5 is moved by the second drive source 8.
B are respectively moved in the cutting direction indicated by the solid arrow, and first, as shown by the two-dot chain line, the cutting edge 5a of the movable cutting blade 5A.
Is brought into contact with the other end p1 of the gate portion 3 in the cutting direction, and the cutting edge 5b of the movable contact member 5B is brought into contact with one end p2 of the gate portion 3 in the cutting direction. Note that the first drive source 7 and the second drive source 8 operate based on a control signal output from the control unit 9.

Here, the movable contact member 5B is stopped, and only the movable cutting blade 5A contacts the movable contact member 5B from the other end p1 of the gate portion 3 in the cutting direction, that is, two points in FIG. As shown by the dashed line, the blade 5a of the movable cutting blade 5A is moved to a position where it comes into contact with the blade 5b of the movable contact member 5B and the gate is moved.
The cutting part 3 is cut, and the resin molded product 1 is collected.

As described above, the cutting edge 5b of the movable contact member 5B
Is brought into contact with one end p2 of the gate portion 3 in the cutting direction, and the movable cutting blade 5 is supported with the movable contact member 5B supporting the gate portion 3.
A is moved from the other end p1 of the gate portion 3 in the cutting direction to the movable contact member 5
By moving the gate portion 3 to a position where the movable cutting blade 5 abuts on the resin molding 1, the movable cutting blade 5
A single cut surface Cy cut by only the cutting edge 5a of A is formed. Therefore, unlike the case where the gate portion 3 is cut by the conventional cutting method, the cut mark 6 formed by the burr-like minute projection is not generated on the resin molded product 1. Also, even if the cutting edge 5 of the movable cutting blade 5A
a and the blade tip 5b of the movable contact member 5B is slightly displaced, the blade tip 5b only acts to support the gate portion 3 and the movable cutting blade 5A after the cutting by the blade tip 5a is completed. Since only the contact is impaired, no cut trace 6 is generated on the resin molded product 1. Therefore, an extra finishing operation step for removing the cut trace 6 is not required, and the production operation efficiency of the high quality resin molded product 1 can be improved accordingly.

Next, another embodiment of the present invention will be described. As shown in FIG. 3, a resin molding material 4 having a gate portion 3 interposed between a resin molding 1 taken out from a resin molding machine and a spool / runner 2 to make the two 1 and 2 continuous. A movable cutting blade 5A having a cutting edge 5a at a tip thereof, and a flat surface 5c facing the cutting edge 5a.
The movable abutment members 5C provided at the ends thereof are opposed to each other in the up-down direction as shown by the solid line so as to correspond to the gate portion 3, and the movable cutter blade 5A is driven by the first drive source 7 and the second drive source 8 The movable contact members 5C are respectively moved in the cutting directions indicated by solid arrows, and first, as shown by the two-dot chain lines, the movable cutting blade 5C is moved.
The cutting edge 5a of A is brought into contact with the other end p1 of the gate portion 3 in the cutting direction, and the flat surface 5c of the movable contact member 5C is brought into contact with one end p2 of the gate portion 3 in the cutting direction.

Here, the movable contact member 5C is stopped, and only the movable cutting blade 5A contacts the movable contact member 5B from the other end p1 of the gate portion 3 in the cutting direction, that is, two points in FIG. As shown by the dashed line, the cutting edge 5a of the movable cutting blade 5A is moved to a position where it comes into contact with the flat surface 5c of the movable contact member 5C to cut the gate portion 3, and the resin molded product 1 is collected.

As described above, the flat surface 5 of the movable contact member 5C
c is brought into contact with one end p2 of the gate portion 3 in the cutting direction, and the movable cutting blade 5A is moved to the other end of the gate portion 3 in the cutting direction with the movable contact member 5C supporting the gate portion 3. By moving from p1 to a position where it comes into contact with the movable contact member 5C,
Since the cutting portion 3 is cut, the resin molded article 1 has a single cut surface Cy cut only by the cutting edge 5a of the movable cutting blade 5A.
Is formed. For this reason, unlike the case where the gate portion 3 is cut by the conventional cutting method, the cut trace 6 formed by the burr-like minute projections is not generated on the resin molded product 1. Even if the edge 5a of the movable cutting blade 5A and the flat surface 5c of the movable contact member 5C are slightly displaced from each other, the flat surface 5c only acts to support the gate 3 and is movable. Since only the contact of the cutting blade 5A after the cutting by the cutting edge 5a is completed is lost, the cut trace 6 is not generated on the resin molded product 1.

Next, an embodiment of the present invention will be described with reference to the drawings. FIG. 5 is an operation explanatory view showing an embodiment according to the second aspect of the present invention, and the same or corresponding parts as those of the first aspect of the invention are denoted by the same reference numerals. In FIG. 5, a resin molding material 4 having a gate portion 3 interposed between a resin molding product 1 taken out of a resin molding machine and a spool / runner 2 to connect the resin molding product 1 and the spool runner 2 to each other is provided. A movable cutting blade 5A having a cutting edge 5a and a fixed contacting member 5D having a cutting edge 5d facing the cutting edge 5a at the tip thereof are vertically opposed to each other in the vertical direction as shown by a solid line, and the fixed contacting member 5D The cutting edge 5d is brought into contact with one end p2 of the gate portion 3 in the cutting direction.

Here, the movable cutting blade 5A is moved by the driving source 7 in the cutting direction indicated by the solid line arrow, and the cutting edge 5a contacts the fixed contact member 5E from the other end p1 of the gate portion 3 in the cutting direction. Position, that is, as shown by the two-dot chain line in FIG.
The blade edge 5a of the movable cutting blade 5A is the blade edge 5 of the fixed contact member 5D.
The gate portion 3 is cut by moving to a position where it comes into contact with d.
The resin molded product 1 is collected. Note that the drive source 7 operates based on a control signal output from the control unit 9.

As described above, the cutting edge 5d of the fixed contact member 5D
Is brought into contact with one end p2 of the gate portion 3 in the cutting direction, and the movable cutting blade 5 is held in a state where the gate portion 3 is supported by the fixed contact member 5D.
A is moved from the other end p1 of the gate portion 3 in the cutting direction to the fixed contact member 5
Since the gate portion 3 is cut by moving it to a position where it contacts the cutting edge 5d of D, the resin molded article 1 has a single cutting surface Cy cut only by the cutting edge 5a of the movable cutting blade 5A. Will be. Therefore, unlike the case where the gate portion 3 is cut by the conventional cutting method, the cut mark 6 formed by the burr-like minute projection is not generated on the resin molded product 1. Also, even if the movable cutting blade 5
Even if there is a slight misalignment between the cutting edge 5a of A and the cutting edge 5d of the fixed contact member 5D, the cutting edge 5b only acts to support the gate portion 3 and cuts the movable cutting blade 5A with the cutting edge 5a. Since only the contact after the termination is damaged, the cut trace 6 is not generated on the resin molded product 1. Therefore, an extra finishing operation step for removing the cut trace 6 is not required, and the high quality resin molded product 1 is accordingly required.
Can improve the efficiency of the manufacturing operation.

Next, another embodiment according to the second aspect of the present invention will be described. As shown in FIG. 7, a resin molding material 4 having a gate portion 3 interposed between a resin molding 1 taken out of a resin molding machine and a spool / runner 2 to connect the two to each other is provided. A movable cutting blade 5A having a cutting edge 5a at the tip thereof, and a flat surface 5e facing the cutting edge 5a.
Are fixed to each other in the vertical direction as shown by the solid line, and the flat surface 5e of the fixed contact member 5E is brought into contact with one end p2 of the gate portion 3 in the cutting direction.

Here, the movable cutting blade 5A is moved by the driving source 7 in the cutting direction indicated by the solid line arrow, and its cutting edge 5a contacts the fixed contact member 5E from the other end p1 of the gate portion 3 in the cutting direction. Position, that is, as shown by the two-dot chain line in FIG.
The movable cutting blade 5A is moved to a position where the cutting edge 5a of the movable cutting blade 5A comes into contact with the flat surface 5e of the fixed contact member 5E to cut the gate portion 3 and collect the resin molded product 1.

As described above, the flat surface 5 of the fixed contact member 5E
e is brought into contact with one end p2 of the gate portion 3 in the cutting direction, and while the gate portion 3 is supported by the fixed contact member 5E, the movable cutting blade 5A is moved to the other end of the gate portion 3 in the cutting direction. By moving from p1 to a position where it contacts the fixed contact member 5E,
Since the cutting portion 3 is cut, the resin molded article 1 has a single cut surface Cy cut only by the cutting edge 5a of the movable cutting blade 5A.
Is formed. For this reason, unlike the case where the gate portion 3 is cut by the conventional cutting method, the cut trace 6 formed by the burr-like minute projections is not generated on the resin molded product 1. Further, even if the edge 5a of the movable cutting blade 5A and the flat surface 5e of the fixed contact member 5E are slightly displaced, the flat surface 5e merely acts to support the gate portion 3 and is movable. Since only the contact of the cutting blade 5A after the cutting by the cutting edge 5a is completed is lost, the cut trace 6 is not generated on the resin molded product 1.

In the above embodiment, the gate cutting in one resin molding 4 having one gate portion 3 and one resin molding 1 has been described. The invention described in (1) is not limited only to the above-described embodiment, but includes gates in two or more resin molding materials 4 having a plurality of gate portions 3, 3 and a plurality of resin molded products 1, 1. It can also be applied to cutting.

[0024]

As described above, the method for cutting a gate of a resin molded article according to the first or second aspect of the present invention has the following special effects.

That is, the movable cutting member is brought into contact with one end of the gate portion in the cutting direction, and the movable cutting blade is moved in the cutting direction of the gate portion with the movable contact member supporting the gate portion. Since the gate portion is cut by moving from the other end to a position where it contacts the movable contact member, a single cut surface cut only by the movable cutting blade is formed on the resin molded product, There is no generation of a cut trace formed by a burr-like minute projection. For this reason, an unnecessary finishing operation step for removing the trace of cut is not required, and the manufacturing operation efficiency of a high quality resin molded product can be improved accordingly.

[Brief description of the drawings]

FIG. 1 is an operation explanatory diagram showing one embodiment according to the first aspect of the present invention;

FIG. 2 is an explanatory diagram showing a cutting end state in FIG. 1;

FIG. 3 is an operation explanatory view showing another embodiment according to the first aspect of the present invention.

FIG. 4 is an explanatory diagram showing a cutting end state in FIG. 3;

FIG. 5 is an operation explanatory view showing one embodiment according to the invention described in claim 2;

FIG. 6 is an explanatory diagram showing a cutting end state in FIG. 5;

FIG. 7 is an operation explanatory diagram showing another embodiment according to the invention described in claim 2;

FIG. 8 is an explanatory diagram showing a cutting end state in FIG. 7;

FIG. 9 is an operation explanatory diagram of a conventional example.

FIG. 10 is an explanatory diagram showing a cutting end state in FIG. 9;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Resin molded product 2 Spool runner 3 Gate part 4 Resin molding material 5A Movable cutting blade 5B Movable cutting blade (movable abutting member) 5C Movable abutting member 5D Fixed cutting blade (fixed abutting member) 5E Fixed abutting member 7 First drive source (drive source) 8 Second drive source p1 The other end in the cutting direction p2 One end in the cutting direction

Claims (2)

[Claims] 1. A resin molding product and a spool / runner, and a gate portion for connecting the resin molding and the spool / runner to each other, the gate portion of a resin molding material taken out of a resin molding machine. And a gate cutting method for separating the gate portion from the resin molded product, wherein the movable cutting blade and the movable contact member facing the cutting blade in the cutting direction. After interposing the gate portion, the movable cutting blade is moved in the cutting direction by the first drive source and the movable contact member is moved in the cutting direction by the second drive source, and the movable contact member is moved to one end of the gate portion in the cutting direction. Wherein the movable cutting blade is moved from the other end of the gate portion in the cutting direction to one end in the cutting direction to cut the gate portion. Method. 2. A resin molding product and a spool runner, and a gate portion for connecting the resin molding product and the spool runner to each other, wherein the gate portion of the resin molding material taken out of the resin molding machine. And a gate cutting method for separating the gate portion from the resin molded product, the method comprising cutting between the movable cutting blade and a fixed contact member facing the cutting blade in the cutting direction. After the fixed contact member is brought into contact with one end of the gate portion in the cutting direction via the gate portion, the movable cutting blade is driven by the drive source from one end of the gate portion in the cutting direction to one end in the cutting direction. And cutting the gate portion by moving the gate.